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Sample records for alice tpc including

  1. ALICE installs its TPC

    CERN Document Server

    2007-01-01

    The ALICE time projection chamber has been transported to the experimental cavern. The handling of this extremely fragile detector was a long and delicate process. The lorry transporting the TPC took one hour to travel from the assembly hall to the access shaft...200 metres away.The TPC was lowered into the ALICE experimental cavern with extreme care. The gap between the structure and the shaft wall was only 10 centimetres! For ALICE the year started with a flurry of activity...but at a snail's pace. On 8 January, the day CERN reopened after the end-of-year break, teams from ALICE and the TS Department began the transportation of the experiment's time projection chamber (TPC), the largest ever built. This 5-metre long and 5-m diameter cylinder was transported from the clean room where it had been assembled to the experimental cavern. The 300-metre journey took no less than four days! Since the TPC is an extremely fragile object, the utmost precautions were exercised in its transportation. The TPC, which is d...

  2. The ALICE TPC

    CERN Document Server

    Garabatos, C

    2004-01-01

    We describe the ALICE TPC, with emphasis on the design features which are driven by the physics requirements of the detector. In particular, the gas choice and composition, Ne-CO/sub 2/ Ý90-10¿, as well as the unprecedentedly high gain for a TPC (2*10/sup 40/), are direct consequences of the expected performance in the high- multiplicity environment of heavy-ion collisions at the LHC. The characteristics of this mixture are discussed and a viable way of improving the stability of detectors working under these conditions, namely the addition of nitrogen into the mixture, is presented. This results in a more effective Penning transfer of neon excited states onto ionisation of the quencher at no penalty for the charge transport and amplification properties.

  3. Simulation and Calibration of the ALICE TPC including innovative Space Charge Calculations

    CERN Document Server

    Rossegger, S; Riegler, W; Betev, L

    2009-01-01

    ALICE is one of the four main particle detectors located around the LHC accelerator at CERN. It is particularly designed to study the physics of the quark-gluon plasma by means of nucleus--nucleus collisions at center-of-mass energies up to 5.5 TeV per nucleon pair. A Time-Projection Chamber (TPC) was chosen to be its central-sub-detector due to its low mass properties and its capabilities to provide a robust and accurate Particle Identification even within ultra-high multiplicity environments (up to 8000 tracks per unit of eta). To achieve the required physics performance, the space point resolution of the TPC must be in the order of 0.2 mm. Due to its gigantic size of 5~m in diameter and 5~m in length, corrections for static as well as dynamic effects are indispensable in order to accomplish the design goal. The research presented covers all major issues relevant for the final calibration and therefore the enhancement of the TPC performance in terms of resolution. The main focus was to distinguish between t...

  4. Readout scheme of the upgraded ALICE TPC

    CERN Document Server

    Appelshaeuser, Harald; Ivanov, Marian; Lippmann, Christian; Wiechula, Jens

    2016-01-01

    In this document, we present the updated readout scheme for the ALICE TPC Upgrade. Two major design changes are implemented with respect to the concept that was presented in the TPC Upgrade Technical Design Report: – The SAMPA front-end ASIC will be used in direct readout mode. – The ADC sampling frequency will be reduced from 10 to 5 MHz. The main results from simulations and a description of the new readout scheme is outlined.

  5. ALICE Time Projection Chamber (TPC) Readout Sector in Lab

    CERN Multimedia

    2003-01-01

    The Time Projection Chamber (TPC) is the main particle tracking detector in ALICE. Charged particles crossing the gas of the TPC knock electrons out of their atoms, which drift in the eletric field. By measuring the arrival of electrons at the end of the chamber, at segments such as the one shown here, the TPC will reconstruct the paths of the original charged particles.

  6. Inbetriebnahme und Kalibrierung der ALICE-TPC

    CERN Document Server

    Wiechula, Jens

    2008-01-01

    ALICE (A Large Ion Collider Experiment), is the dedicated heavy-ion experiment at the Large Hadron Collider (LHC) at CERN. It is optimised to reconstruct and identify the particles created in a lead-lead collision with a centre of mass energy of 5.5TeV. The main tracking detector is a large-volume time-projection chamber (TPC). With an active volume of about 88m^3 and a total readout area of 32.5m^2 it is the most challenging TPC ever build. A central electrode divides the 5m long detector into two drift regions. Each readout side is subdivided into 18 inner and 18 outer multi-wire proportional read-out chambers. The readout area is subdivide into 557568 pads, where each pad is read out by and electronics chanin. A complex calibration is needed in order to reach the design position-resolution of the reconstructed particle tracks of about 200um. One part of the calibration lies in understanding the electronic-response. The work at hand presents results of the pedestal and noise behaviour of the front-end elect...

  7. Prototype of the ALICE Time Projection Chamber (TPC) Field-Cage

    CERN Multimedia

    2003-01-01

    The ALICE Time Projection Chamber (TPC) is the main particle tracking detector in ALICE. Charged particles crossing the gas of the TPC knock electons out of their atoms, which then drift in in the electric field. By measuring the arrival of electrons at the end of the chamber, the TPC will reconstruct the paths of the original charged particles.

  8. Upgrade of the ALICE-TPC read-out electronics

    CERN Document Server

    Junique, A; Musa , L; Rehman , A U

    2010-01-01

    The ALICE experiment at CERN LHC employs a large volume time projection chamber (TPC) as its main tracking device. Instigated by analyses indicating that the high level trigger is capable of sifting events with rare physics probes, it is endeavoured to read out the TPC an order of magnitude faster then was reckoned during the design of its read-out electronics. Based on an analysis of the read-out performance of the current system, an upgrade of the front-end read-out network is proposed. The performance of the foreseen architecture is simulated with raw data from real 7 TeV pp collisions. Events are superimposed in order to emulate the future ALICE running conditions: high multiplicity events generated either by PbPb collisions or by the superposition (pile-up) of a large number of pp collisions. The first prototype of the main building block has been produced and characterised, demonstrating the feasibility of the approach

  9. Upgrade of the ALICE-TPC read-out electronics

    Energy Technology Data Exchange (ETDEWEB)

    Junique, A; Mager, M; Musa, L; Rehman, A Ur, E-mail: Magnus.Mager@cern.ch [CERN, Geneva (Switzerland)

    2010-12-15

    The ALICE experiment at CERN LHC employs a large volume time projection chamber (TPC) as its main tracking device. Instigated by analyses indicating that the high level trigger is capable of sifting events with rare physics probes, it is endeavoured to read out the TPC an order of magnitude faster then was reckoned during the design of its read-out electronics. Based on an analysis of the read-out performance of the current system, an upgrade of the front-end read-out network is proposed. The performance of the foreseen architecture is simulated with raw data from real 7 TeV pp collisions. Events are superimposed in order to emulate the future ALICE running conditions: high multiplicity events generated either by PbPb collisions or by the superposition (pile-up) of a large number of pp collisions. The first prototype of the main building block has been produced and characterised, demonstrating the feasibility of the approach.

  10. The Readout Control Unit of the ALICE TPC

    CERN Document Server

    Lien, J A; Musa, L

    2004-01-01

    The ALICE Time Projection Chamber (TPC) is the main tracking detector of the central barrel of the ALICE (A Large Ion Collider) Experiment at the Large Hadron Collider (LHC), being constructed at CERN, Geneva. It is a 88 m$^{3}$ cylinder filled with gas and divided into two drift regions by the central electrode located at its axial center. The readout chambers of the TPC are multi-wire proportional chambers with cathode pad readout. About 570 000 pads are read-out by an electronics chain of amplification, digitalization and pre-processing. One of the challenges in designing the TPC for ALICE is the design of Front End Electronics (FEE) to cope with the data rates and the channel occupancy. The Readout Control Unit (RCU), which is presented in this work, is designed to control and monitor the Front End Electronics, and to collect and ship data to the High Level Trigger and the Data Acquisition System, via the Detector Data Link (DDL - optical fibre). The RCU must be capable of reading out up to 200 Mbytes/s f...

  11. Future Upgrade and Physics Perspectives of the ALICE TPC

    CERN Document Server

    INSPIRE-00033137

    2014-01-01

    The ALICE experiment at the Large Hadron Collider (LHC) proposes major detector upgrades to fully exploit the increase of the luminosity of the LHC in RUN~3 and to extend the physics reach for rare probes at low transverse momentum. The Time Projection Chamber (TPC) is one of the main tracking and PID devices in the central barrel of ALICE. The maximum trigger rate of the TPC is currently limited to about 3.5 kHz by the operation of a gating grid system. In order to make full use of the luminosity in RUN 3, the TPC is foreseen to be operated in an ungated mode with continuous readout. The existing MWPC readout will be replaced by a Micro-Pattern Gaseous Detector (MPGD) based readout, which provides intrinsic ion capture capability without gating. Extensive detector R\\&D employing Gas Electron Multiplier (GEM) and Micro-Mesh Gaseous detector (Micromegas) technologies, and simulation studies to advance the techniques for the corrections of space-charge distortions have been performed since 2012. In this pap...

  12. A continuous read-out TPC for the ALICE upgrade

    Science.gov (United States)

    Lippmann, C.

    2016-07-01

    The largest gaseous Time Projection Chamber (TPC) in the world, the ALICE TPC, will be upgraded based on Micro Pattern Gas Detector technology during the second long shutdown of the CERN Large Hadron Collider in 2018/19. The upgraded detector will operate continuously without the use of a triggered gating grid. It will thus be able to read all minimum bias Pb-Pb events that the LHC will deliver at the anticipated peak interaction rate of 50 kHz for the high luminosity heavy-ion era. New read-out electronics will send the continuous data stream to a new online farm at rates up to 1 TByte/s. A fractional ion feedback of below 1% is required to keep distortions due to space charge in the TPC drift volume at a tolerable level. The new read-out chambers will consist of quadruple stacks of Gas Electron Multipliers (GEM), combining GEM foils with a different hole pitch. Other key requirements such as energy resolution and operational stability have to be met as well. A careful optimisation of the performance in terms of all these parameters was achieved during an extensive R&D program. A working point well within the design specifications was identified with an ion backflow of 0.63%, a local energy resolution of 11.3% (sigma) and a discharge probability comparable to that of standard triple GEM detectors.

  13. ALICE TPC upgrade for High-Rate operations

    CERN Document Server

    ,

    2015-01-01

    A new type of Time Projection Chamber (TPC) has been proposed for the upgrade of the ALICE (A Large Ion Collider Experiment at CERN) so as to cater to the high luminosity environment expected at the Large Hadron Collider (LHC) facility in future. This device will rely on the intrinsic ion back flow (IBF) suppression of Micro-Pattern Gas Detectors (MPGD) based technology in particular the Gas Electron Multiplier (GEM). GEM is to minimise the space charge effect in the main drift volume and thus will not require the standard gating grid and the resulting intrinsic dead time. It will thus be possible to read all minimum bias Pb--Pb events that the Large Hadron Collider (LHC) will deliver at the anticipated peak interaction rate of 50 kHz for the high luminosity heavy-ion era in Run 3. New read-out electronics will send the continuous data stream to a new online farm at rates up to 1~TByte/s. The new read-out chambers will consist of stacks of 4 GEM foils combining different hole pitches. In addition to a low ion...

  14. RCU2-The ALICE TPC readout electronics consolidation for Run2

    CERN Document Server

    Alme, J; Christiansen, P; Yang, S; Lien, J; Velure, A; Rehman, A Ur; Torgersen, C; David, E; Gunji, T; Osterman, L; Ullaland, K; Roed, K; Tarantola, A; Langoy, R; Appelshaeuser, H; Oskarsson, A; Alt, T; Costa, F; Bratrud, L; Zhao, C; Lippmann, C; Torsvik, I Nikolai; Kiss, T

    2013-01-01

    This paper presents the solution for optimization of the ALICE TPC readout for running at full energy in the Run2 period after 2014. For the data taking with heavy ion beams an event readout rate of 400 Hz with a low dead time is envisaged for the ALICE central barrel detectors during these three years. A new component, the Readout Control Unit 2 (RCU2), is being designed to increase the present readout rate by a factor of up to 2.6. The immunity to radiation induced errors will also be significantly improved by the new design.

  15. Particle Identification in Jets and High-Multiplicity pp Events with the ALICE TPC

    CERN Document Server

    AUTHOR|(SzGeCERN)683272; Vogelsang, Werner

    The spectra of identified particles in a collision experiment comprise crucial information about the underlying physical processes. The ALICE experiment has powerful Particle IDentification (PID) capabilities, which are unique at the Large Hadron Collider (LHC). In this thesis, a statistical PID method based on the specific energy loss d$E$/d$x$ in the ALICE Time Projection Chamber (TPC) is developed: the TPC Multi-Template Fit (MTF). The MTF allows for the extraction of identified charged particle spectra in a wide momentum range, which extends from about 150 MeV/$c$ to above 20 GeV/$c$. The TPC PID requires a detailed modelling of the TPC d$E$/d$x$ response for momenta above 2-3 GeV/$c$. A framework is developed that allows for the determination of the model parameters and for evaluating the PID information of charged particles. With the MTF, the transverse momentum $p_{\\mathrm{T}}$ spectra of charged pions, kaons and protons at mid-rapidity ($|\\eta| < 0.9$) are measured for pp collisions at $\\sqrt{s}$ ...

  16. A distributed, heterogeneous control system for the ALICE TPC electronics

    CERN Document Server

    Alme, Johan; Bablok, S; Skeie, T; Engster, Claude; Frankenfeld, Ulrich; González-Gutierrez, C; Gottschalk, D; Hobbel, H; Junique, A; Keidel, R; Kiworra, V; Kofler, C; Krawutschke, T; Larsen, D; Lindenstruth, V; Mota, B; Musa, L; Richter, M; Roe, K; Röhrich, D; Stockmeier, M R; Ullaland, K; Yang, C S

    2005-01-01

    The ALICE detector is a dedicated heavy-ion detector currently built at the Large Hadron Collider (LHC) at CERN. The detector consists of several sub-detectors each of them forming a highly complex device. The detector control system (DCS) covers the task of controlling, configuring and monitoring of the detector system. Since the experiment was running in a radiation environment, fault tolerance, error correction and system stability in general are major concerns. A system consisting of independently running layers has been designed, the functionality layers are running on a large number of nodes and sub-nodes. An autonomous single-board computer, the DCS board, has been developed which allows one to run the operating system Linux in an embedded environment and to perform tasks related to the hardware devices. Further custom hardware devices have been developed covering specific tasks and serving as sub-nodes. These devices together with standard computers in higher control layers form a distributed control ...

  17. Identifying Charged Hadrons on the Relativistic Rise Using the ALICE TPC at LHC

    CERN Document Server

    Gros, Philippe

    2011-01-01

    The chain from hadron collisions to the physics results requires several important links. First the outcome of the collision is measured by the detectors. Then, the signal from the detector is processed and transformed into information relevant for the study of the physics processes. The data is made available to physicists to be analysed and used to improve theories. This thesis presents work done on no most of these steps for the ALICE experiment at LHC. First a study of the main processes in the TPC detector for ALICE was done using simulation and test beam data. The results are shown in paper I. The study was deepened with the analysis of test beam data from a TPC prototype for the ILC, as shown in paper III. Concurrently, a study on the Grid – computing framework for distributed computing and storage resources – was performed. This involved the development of an interface module between the ALICE software AliEn and the ARC software developped in the Nordic countries. This work is presented in paper I...

  18. Quality assurance of GEM foils in the framework of the TPC upgrade in the ALICE experiment

    CERN Document Server

    Ozcelik, Melih Arslan

    2016-01-01

    In the framework of the TPC upgrade of the ALICE Experiment, new readout chambers will be installed during the LHC long shutdown 2, which is scheduled to start in July 2018. The current MWPCs (Multi Wire Proportional Chambers) will be replaced by readout chambers consisting of GEM (Gas Electron Multipliers) foils in order to meet the increasing readout rate requirements. QA (Quality Assurance) tests on the GEMs are performed to classify the foils. In this report we present the work done during the CERN Summer Student Programme 2016.

  19. Status of the R&D activities for the upgrade of the ALICE TPC

    CERN Document Server

    Deisting, Alexander

    2016-01-01

    In order to cope with the high interaction rates provided by the LHC after the long shut-down 2, the ALICE TPC needs to be upgraded. After the upgrade the TPC will run in a continuous mode, without any degradation of the momentum and $\\textrm{d}E/\\textrm{d}x$ resolution compared to the performance of the present TPC. Since readout by MWPCs is no longer feasible with these requirements, new technologies have to be employed. In the new readout the electron amplification is provided by a stack of four GEM foils. Here foils with a standard hole pitch of 140um as well as large pitch foils (280um) are used. Their high voltage settings and orientation have been optimised to provide an energy resolution of $\\sigma_{{E}}/{E}\\leq12\\%$ at the photopeak of $^{55}\\textrm{Fe}$. At the same settings the Ion BackFlow into the drift volume is less than 1% of the effective number of ions produced during gas amplification and the primary ionisations. This is necessary to prevent the accumulation of space charge, which eventuall...

  20. Test of the ALICE DDL Test setups and Test of ALICE DDL Integration to ALICE TPC test system

    CERN Document Server

    Csató, P; Sulyán, J; Rubin, G; Tarján, D; Vissy, B

    1998-01-01

    Presentation made at the 4th Workshop on Electronics for LHC Experiments, INFN Rome, 21-25 September 1998.The Detector Data Link (DDL) has been developed to constitute a standard interface between the ALICE sub-detectors and the DAQ system.In this paper we present the test environment and the application software library made for supporting the DDL development and its integration into the ALICE detector system. The test setups contain VME64 crates, MVME processor cards, a VMETRO analyser, a logic-analyser and Read-out-Receiver (RORC) andDestination-Interface-Unit (DIU) cards. They made possible to measure the maximum throughput of the full read-out chain and also to measurethe transmission latencies. They support the functional and long-term stability tests as well.

  1. A Time Projection Chamber for High-Rate Experiments: Towards an Upgrade of the ALICE TPC

    CERN Document Server

    Ketzer, Bernhard

    2013-01-01

    A Time Projection Chamber (TPC) is a powerful detector for 3-dimensional tracking and particle identification for ultra-high multiplicity events. It is the central tracking device of many experiments, e.g. the ALICE experiment at CERN. The necessity of a switching electrostatic gate, which prevents ions produced in the amplification region o MWPCs from entering the drift volume, however, restricts its application to trigger rates of the order of 1 kHz. Charge amplification by Gas Electron Multiplier (GEM) foils instead of proportional wires offers an intrinsic suppression of the ion backflow, although not to the same level as a gating grid. Detailed Monte Carlo simulations have shown that the distortions due to residual space charge from back-drifting ions can be limited to a few cm, and thus can be corrected using standard calibration techniques. A prototype GEM-TPC has been built with the largest active volume to date for a detector of this type. It has been commissioned with cosmics and particle beams at t...

  2. Fast TPC Online Tracking on GPUs and Asynchronous Data Processing in the ALICE HLT to facilitate Online Calibration

    Science.gov (United States)

    Rohr, David; Gorbunov, Sergey; Krzewicki, Mikolaj; Breitner, Timo; Kretz, Matthias; Lindenstruth, Volker

    2015-12-01

    ALICE (A Large Heavy Ion Experiment) is one of the four major experiments at the Large Hadron Collider (LHC) at CERN, which is today the most powerful particle accelerator worldwide. The High Level Trigger (HLT) is an online compute farm of about 200 nodes, which reconstructs events measured by the ALICE detector in real-time. The HLT uses a custom online data-transport framework to distribute data and workload among the compute nodes. ALICE employs several calibration-sensitive subdetectors, e.g. the TPC (Time Projection Chamber). For a precise reconstruction, the HLT has to perform the calibration online. Online- calibration can make certain Offline calibration steps obsolete and can thus speed up Offline analysis. Looking forward to ALICE Run III starting in 2020, online calibration becomes a necessity. The main detector used for track reconstruction is the TPC. Reconstructing the trajectories in the TPC is the most compute-intense step during event reconstruction. Therefore, a fast tracking implementation is of great importance. Reconstructed TPC tracks build the basis for the calibration making a fast online-tracking mandatory. We present several components developed for the ALICE High Level Trigger to perform fast event reconstruction and to provide features required for online calibration. As first topic, we present our TPC tracker, which employs GPUs to speed up the processing, and which bases on a Cellular Automaton and on the Kalman filter. Our TPC tracking algorithm has been successfully used in 2011 and 2012 in the lead-lead and the proton-lead runs. We have improved it to leverage features of newer GPUs and we have ported it to support OpenCL, CUDA, and CPUs with a single common source code. This makes us vendor independent. As second topic, we present framework extensions required for online calibration. The extensions, however, are generic and can be used for other purposes as well. We have extended the framework to support asynchronous compute

  3. Building a large-area GEM-based readout chamber for the upgrade of the ALICE TPC

    CERN Document Server

    Gasik, Piotr

    2016-01-01

    A large Time Projection Chamber (TPC) is the main device for tracking and charged-particle identification in the ALICE experiment at the CERN LHC. After the second long shutdown in 2019-2020, the LHC will deliver Pb beams colliding at an interaction rate up to 50 kHz, which is about a factor of 100 above the present read-out rate of the TPC. To fully exploit the LHC potential the TPC will be upgraded based on the Gas Electron Multiplier (GEM) technology. A prototype of an ALICE TPC Outer Read-Out Chamber (OROC) was equipped with twelve large-size GEM foils as amplification stage to demonstrate the feasibility of replacing the current Multi Wire Proportional Chambers with the new technology. With a total area of $\\sim$0.76 m$^2$ it is the largest GEM-based detector built to date. The GEM OROC was installed within a test field cage and commissioned with radioactive sources.

  4. Building a large-area GEM-based readout chamber for the upgrade of the ALICE TPC

    Science.gov (United States)

    Gasik, P.

    2017-02-01

    A large Time Projection Chamber (TPC) is the main device for tracking and charged-particle identification in the ALICE experiment at the CERN LHC. After the second long shutdown in 2019-2020, the LHC will deliver Pb beams colliding at an interaction rate up to 50 kHz, which is about a factor of 100 above the present read-out rate of the TPC. To fully exploit the LHC potential the TPC will be upgraded based on the Gas Electron Multiplier (GEM) technology. A prototype of an ALICE TPC Outer Read-Out Chamber (OROC) was equipped with twelve large-size GEM foils as amplification stage to demonstrate the feasibility of replacing the current Multi Wire Proportional Chambers with the new technology. With a total area of ∼0.76 m2 it is the largest GEM-based detector built to date. The GEM OROC was installed within a test field cage and commissioned with radioactive sources.

  5. The ALICE TPC, a large 3-dimensional tracking device with fast readout for ultra-high multiplicity events

    CERN Document Server

    INSPIRE-00249819; Appelshauser, H.; Bablok, S.; Bialas, N.; Bolgen, R.; Bonnes, U.; Bramm, R.; Braun-Munzinger, P.; Campagnolo, R.; Christiansen, P.; Dobrin, A.; Engster, C.; Fehlker, D.; Foka, Y.; Frankenfeld, U.; Gaardhoje, J.J.; Garabatos, C.; Glassel, P.; Gonzalez Gutierrez, C.; Gros, P.; Gustafsson, H.A.; Helstrup, H.; Hoch, M.; Ivanov, M.; Janik, R.; Junique, A.; Kalweit, A.; Keidel, R.; Kniege, S.; Kowalski, M.; Larsen, D.T.; Lesenechal, Y.; Lenoir, P.; Lindegaard, N.; Lippmann, C.; Mager, M.; Mast, M.; Matyja, A.; Munkejord, M.; Musa, L.; Nielsen, B.S.; Nikolic, V.; Oeschler, H.; Olsen, E.K.; Oskarsson, A.; Osterman, L.; Pikna, M.; Rehman, A.; Renault, G.; Renfordt, R.; Rossegger, S.; Rohrich, D.; Roed, K.; Richter, M.; Rueshmann, G.; Rybicki, A.; Sann, H.; Schmidt, H.R.; Siska, M.; Sitar, B.; Soegaard, C.; Soltveit, H.K.; Soyk, D.; Stachel, J.; Stelzer, H.; Stenlund, E.; Stock, R.; Strmen, P.; Szarka, I.; Ullaland, K.; Vranic, D.; Veenhof, R.; Westergaard, J.; Wiechula, J.; Windelband, B.

    2010-01-01

    The design, construction, and commissioning of the ALICE Time-Projection Chamber (TPC) is described. It is the main device for pattern recognition, tracking, and identification of charged particles in the ALICE experiment at the CERN LHC. The TPC is cylindrical in shape with a volume close to 90 m^3 and is operated in a 0.5 T solenoidal magnetic field parallel to its axis. In this paper we describe in detail the design considerations for this detector for operation in the extreme multiplicity environment of central Pb--Pb collisions at LHC energy. The implementation of the resulting requirements into hardware (field cage, read-out chambers, electronics), infrastructure (gas and cooling system, laser-calibration system), and software led to many technical innovations which are described along with a presentation of all the major components of the detector, as currently realized. We also report on the performance achieved after completion of the first round of stand-alone calibration runs and demonstrate result...

  6. Firmware Development and Integration for ALICE TPC and PHOS Front-end Electronics A Trigger Based Readout and Control System operating in a Radiation Environment

    CERN Document Server

    AUTHOR|(CDS)2068589; Rohrich, Dieter

    2008-01-01

    The readout electronics in PHOS and TPC - two of the major detectors of the ALICE experiment at the LHC - consist of a set of Front End Cards (FECs) that digitize, process and buffer the data from the detector sensors. The FECs are connected to a Readout Control Unit (RCU) via two sets of custom made PCB backplanes. For PHOS, 28 FECs are connected to one RCU, while for TPC the number is varying from 18 to 25 FECs depending on location. The RCU is in charge of the data readout, including reception and distribution of triggers and in moving the data from the FECs to the Data Acquisition System. In addition it does low level control tasks. The RCU consists of an RCU Motherboard that hosts a Detector Control System (DCS) board and a Source Interface Unit. The DCS board is an embedded computer running Linux that controls the readout electronics. All the mentioned devices are implemented in commercial grade SRAM based Field Programmable Gate Arrays (FPGAs). Even if these devices are not very radiation tolerant, the...

  7. ALICE chip processor

    CERN Multimedia

    Maximilien Brice

    2003-01-01

    This tiny chip provides data processing for the time projection chamber on ALICE. Known as the ALICE TPC Read Out (ALTRO), this device was designed to minimize the size and power consumption of the TPC front end electronics. This single chip contains 16 low-power analogue-to-digital converters with six million transistors of digital processing and 8 kbits of data storage.

  8. ALICE Time Projection Chamber

    CERN Multimedia

    Lippmann, C

    2013-01-01

    The Time Projection Chamber (TPC) is the main device in the ALICE 'central barrel' for the tracking and identification (PID) of charged particles. It has to cope with unprecedented densities of charges particles.

  9. ALICE comes to life

    CERN Multimedia

    2002-01-01

    On 26 March, a first major part of the ALICE detector arrived at CERN: one of the four cylinders in composite material for the Time Projection Chamber (TPC). The construction of the TPC 'field cage' (the structure that defines the configuration of the electrical field of the TPC) is the fruit of exceptional collaboration between CERN and the Austrian manufacturer Fischer Advanced Composite Components (Fischer ACC).

  10. ALICE presents its first award to Industry

    CERN Multimedia

    Maximilien Brice

    2003-01-01

    Behind from left to right (Derrière de gauche à droite): Bernardo Mota, member of the ALTRO design team, Jurgen Schukraft, ALICE Spokesperson, Luciano Musa, leader of the ALTRO Design Team and Coordinator of the ALICE TPC FEE, Roberto Camapagnolo, member of the ALICE TPC FEE team, Jean-Pierre Coffin, Deputy of the ALICE Collaboration Board Chairman, Hans de Groot ALICE Resource Coordinator, Laurent Degoujon, ST - Data Converter Design Manager, Claude Engster, member of the ALICE TPC FEE team, Alain Delpi, ST - Data Converter Business Unit Manager, Carmen Gonzalez, member of the ALICE TPC FEE team, Yiota Foka, ALICE Outreach Coordinator; Front: Fabio Formenti , EP-ED Group Leader, Juan Antonio Rubio, ETT Division Leader.

  11. Prototype ALICE front-end card

    CERN Multimedia

    Maximilien Brice

    2004-01-01

    This circuit board is a prototype 48-channel front end digitizer card for the ALICE time projection chamber (TPC), which takes electrical signals from the wire sensors in the TPC and shapes the data before converting the analogue signal to digital data. A total of 4356 cards will be required to process the data from the ALICE TPC, the largest of this type of detector in the world.

  12. ORNL ALICE: a statistical model computer code including fission competition. [In FORTRAN

    Energy Technology Data Exchange (ETDEWEB)

    Plasil, F.

    1977-11-01

    A listing of the computer code ORNL ALICE is given. This code is a modified version of computer codes ALICE and OVERLAID ALICE. It allows for higher excitation energies and for a greater number of evaporated particles than the earlier versions. The angular momentum removal option was made more general and more internally consistent. Certain roundoff errors are avoided by keeping a strict accounting of partial probabilities. Several output options were added.

  13. ALICE presents its first award to Industry

    CERN Multimedia

    On 19 June, a French company received the first ALICE award to industry. ST Technologies has provided ALICE with a key device for the design of a very sophisticated chip for the readout of the ALICE Time Projection Chamber. Behind from left to right (Derrière de gauche à droite): Bernardo Mota, member of the ALTRO design team, Jurgen Schukraft, ALICE Spokesperson, Luciano Musa, leader of the ALTRO Design Team and Coordinator of the ALICE TPC FEE, Roberto Camapagnolo, member of the ALICE TPC FEE team, Jean-Pierre Coffin, Deputy of the ALICE Collaboration Board Chairman, Hans de Groot ALICE Resource Coordinator, Laurent Degoujon, ST - Data Converter Design Manager, Claude Engster, member of the ALICE TPC FEE team, Alain Delpi, ST - Data Converter Business Unit Manager, Carmen Gonzalez, member of the ALICE TPC FEE team, Yiota Foka, ALICE Outreach Coordinator; Front: Fabio Formenti , EP-ED Group Leader, Juan Antonio Rubio, ETT Division Leader The ALICE experiment is setting new demands on readout electronics i...

  14. Measurement of electrons from heavy-flavour hadron decays in p-Pb collisions at $\\sqrt{s_{NN}} = 5.02$ TeV using TPC and EMCal detectors with ALICE at LHC

    CERN Document Server

    Jahnke, Cristiane

    Heavy-ion collisions are a powerful tool to study hot and dense QCD matter, the so-called Quark Gluon Plasma (QGP). Since heavy quarks (charm and beauty) are dominantly produced in the early stages of the collision, they experience the complete evolution of the system. Measurements of electrons from heavy-flavour hadron decay is one possible way to study the interaction of these particles with the QGP. With ALICE at LHC, electrons can be identified with high efficiency and purity. A strong suppression of heavy-flavour decay electrons has been observed at high $p_{m T}$ in Pb-Pb collisions at 2.76 TeV. Measurements in p-Pb collisions are crucial to understand cold nuclear matter effects on heavy-flavour production in heavy-ion collisions. The spectrum of electrons from the decays of hadrons containing charm and beauty was measured in p-Pb collisions at $\\sqrt = 5.02$ TeV. The heavy flavour decay electrons were measured by using the Time Projection Chamber (TPC) and the Electromagnetic Calorimeter (EMCal) detec...

  15. The ALICE Data Challenges

    Institute of Scientific and Technical Information of China (English)

    J.P.Baud; W.Carena; 等

    2001-01-01

    Since 1998,the ALICE experiment and the CERN/IT division have jointly executed several large-scale high throughput distributed computing exercises:the ALICE data challenges.The goals of these regular exercises are to test hardware and software components of the data acqusition and computing systems in realistic conditions and to execute an early integration of the overall ALICE computing infrastructure.This paper reports on the third ALICE Data Challenge (ADC III) that has been performed at CERN from January to March 2001.The data used during the ADC Ⅲ are simulated physics raw data of the ALICE TPC,produced with the ALICE simulation program AliRoot.The data acquisition was based on the ALICE online framework called the ALICE Data Acquisition Test Environment (DATE) system.The data after event building,were then formatted with the ROOT I/O package and a data catalogue based on MySQl was established.The Mass Storage System used during ADC III is CASTOR.Different software tools have been used to monitor the performances,DATE has demonstrated performances of more than 500 MByte/s.An aggregate data throughput of 85 MByte/s was sutained in CASTOR over several days.The total collected data amounts to 100 TBytes in 100.00 files.

  16. Online Reconstruction and Calibration with Feedback Loop in the ALICE High Level Trigger

    Science.gov (United States)

    Rohr, David; Shahoyan, Ruben; Zampolli, Chiara; Krzewicki, Mikolaj; Wiechula, Jens; Gorbunov, Sergey; Chauvin, Alex; Schweda, Kai; Lindenstruth, Volker

    2016-11-01

    ALICE (A Large Heavy Ion Experiment) is one of the four large scale experiments at the Large Hadron Collider (LHC) at CERN. The High Level Trigger (HLT) is an online computing farm, which reconstructs events recorded by the ALICE detector in real-time. The most computing-intensive task is the reconstruction of the particle trajectories. The main tracking devices in ALICE are the Time Projection Chamber (TPC) and the Inner Tracking System (ITS). The HLT uses a fast GPU-accelerated algorithm for the TPC tracking based on the Cellular Automaton principle and the Kalman filter. ALICE employs gaseous subdetectors which are sensitive to environmental conditions such as ambient pressure and temperature and the TPC is one of these. A precise reconstruction of particle trajectories requires the calibration of these detectors. As our first topic, we present some recent optimizations to our GPU-based TPC tracking using the new GPU models we employ for the ongoing and upcoming data taking period at LHC. We also show our new approach to fast ITS standalone tracking. As our second topic, we present improvements to the HLT for facilitating online reconstruction including a new flat data model and a new data flow chain. The calibration output is fed back to the reconstruction components of the HLT via a feedback loop. We conclude with an analysis of a first online calibration test under real conditions during the Pb-Pb run in November 2015, which was based on these new features.

  17. Online Reconstruction and Calibration with Feedback Loop in the ALICE High Level Trigger

    Directory of Open Access Journals (Sweden)

    Rohr David

    2016-01-01

    at the Large Hadron Collider (LHC at CERN. The High Level Trigger (HLT is an online computing farm, which reconstructs events recorded by the ALICE detector in real-time. The most computing-intensive task is the reconstruction of the particle trajectories. The main tracking devices in ALICE are the Time Projection Chamber (TPC and the Inner Tracking System (ITS. The HLT uses a fast GPU-accelerated algorithm for the TPC tracking based on the Cellular Automaton principle and the Kalman filter. ALICE employs gaseous subdetectors which are sensitive to environmental conditions such as ambient pressure and temperature and the TPC is one of these. A precise reconstruction of particle trajectories requires the calibration of these detectors. As our first topic, we present some recent optimizations to our GPU-based TPC tracking using the new GPU models we employ for the ongoing and upcoming data taking period at LHC. We also show our new approach to fast ITS standalone tracking. As our second topic, we present improvements to the HLT for facilitating online reconstruction including a new flat data model and a new data flow chain. The calibration output is fed back to the reconstruction components of the HLT via a feedback loop. We conclude with an analysis of a first online calibration test under real conditions during the Pb-Pb run in November 2015, which was based on these new features.

  18. ALICE Organisation

    CERN Multimedia

    Gouriou, Nathalie

    2016-01-01

    ALICE is the acronym for A Large Ion Collider Experiment, one of the largest experiments in the world devoted to research in the physics of matter at an infinitely small scale. Hosted at CERN, the European Laboratory for Nuclear Research, this project involves an international collaboration of more than 1400 physicists, engineers and technicians, including about 340 graduate students, from 132 physics institutes in 37 countries across the world.

  19. ALICE Organisation

    CERN Multimedia

    Hadre, J

    2015-01-01

    ALICE is the acronym for A Large Ion Collider Experiment, one of the largest experiments in the world devoted to research in the physics of matter at an infinitely small scale. Hosted at CERN, the European Laboratory for Nuclear Research, this project involves an international collaboration of more than 1400 physicists, engineers and technicians, including around 340 graduate students, from 132 physics institutes in 37 countries across the world.

  20. ALICE Transition Radiation Detector

    CERN Multimedia

    Pachmayer, Y

    2013-01-01

    The Transition Radiation Detector (TRD) is the main electron detector in ALICE. In conduction with the TPC and the ITS, it provides the necessary electron identification capability to study: - Production of light and heavy vector mesons as well as the continuum in the di-electron channel, - Semi leptonic decays of hadrons with open charm and open beauty via the single-electron channel using the displaced vertex information provided by the ITS, - Correlated DD and BB pairs via coincidences of electrons in the central barrel and muons in the forward muon arm, - Jets with high Pτ tracks in one single TRD stack.

  1. On TPC cluster reconstruction

    CERN Document Server

    Dydak, F; Nefedov, Y; Wotschack, J; Zhemchugov, A

    2004-01-01

    For a bias-free momentum measurement of TPC tracks, the correct determination of cluster positions is mandatory. We argue in particular that (i) the reconstruction of the entire longitudinal signal shape in view of longitudinal diffusion, electronic pulse shaping, and track inclination is important both for the polar angle reconstruction and for optimum r phi resolution; and that (ii) self-crosstalk of pad signals calls for special measures for the reconstruction of the z coordinate. The problem of 'shadow clusters' is resolved. Algorithms are presented for accepting clusters as 'good' clusters, and for the reconstruction of the r phi and z cluster coordinates, including provisions for 'bad' pads and pads next to sector boundaries, respectively.

  2. Still Alice

    OpenAIRE

    Massa, Lilian Dias Bernardo; Faria,Lina Rodrigues de

    2015-01-01

    Alice Howland (Julianne Moore), happily married with three grown children, is a renowned linguistics professor who starts to forget words. When she receives a diagnosis of Early-Onset Alzheimer's Disease, Alice and her family find their bonds thoroughly tested. Her struggle to stay connected to who she once was is frightening, heartbreaking, and inspiring. Alice Howland (Julianne Moore), felizmente casada y con tres hijos, es una renombrada profesora de lingüística que empieza a olvidar pa...

  3. TPC magnet cryogenic system

    Energy Technology Data Exchange (ETDEWEB)

    Green, M.A.; Burns, W.A.; Taylor, J.D.; Van Slyke, H.W.

    1980-03-01

    The Time Projection Chamber (TPC) magnet at LBL and its compensation solenoids are adiabatically stable superconducting solenoid magnets. The cryogenic system developed for the TPC magnet is discussed. This system uses forced two-phase tubular cooling with the two cryogens in the system. The liquid helium and liquid nitrogen are delivered through the cooled load by forced tubular flow. The only reservoirs of liquid cryogen exist in the control dewar (for liquid helium) and the conditioner dewar (for liquid nitrogen). The operation o these systems during virtually all phases of system operation are described. Photographs and diagrams of various system components are shown, and cryogenic system data are presented in the following sections: (1) heat leaks into the TPC coil package and the compensation solenoids; (2) heat leaks to various components of the TPC magnet cryogenics system besides the magnets and control dewar; (3) the control dewar and its relationship to the rest of the system; (4) the conditioner system and its role in cooling down the TPC magnet; (5) gas-cooled electrical leads and charging losses; and (6) a summation of the liquid helium and liquid nitrogen requirements for the TPC superconducting magnet system.

  4. ALICE bags data storage accolades

    CERN Multimedia

    2007-01-01

    ComputerWorld has recognized CERN with an award for the 'Best Practices in Storage' for ALICE's data acquisition system, in the category of 'Systems Implementation'. The award was presented to the ALICE DAQ team on 18 April at a ceremony in San Diego, CA. (Top) ALICE physicist Ulrich Fuchs. (Bottom) Three of the five storage racks for the ALICE Data Acquisition system (Photo Antonio Saba). Between 16 and19 April, one thousand people from data storage networks around the world gathered to attend the biannual Storage Networking World Conference. Twenty-five companies and organizations were celebrated as finalists, and five of those were given honorary awards-among them CERN, which tied for first place in the category of Systems Implementation for the success of the ALICE Data Acquisition System. CERN was one of five finalists in this category, which recognizes the winning facility for 'the successful design, implementation and management of an interoperable environment'. 'Successful' could include documentati...

  5. ALICE overview

    CERN Document Server

    Räsänen, Sami S.

    2016-01-01

    Recent results from the ALICE experiment are presented with a particular emphasis on particle identification, the nuclear modification factor ($R_{AA}$) and azimuthal anisotropy ($v_2$). Comparison of lead-lead and proton-lead results reveals evidence of collectivity in small systems.

  6. The ALICE Electronic Logbook

    Energy Technology Data Exchange (ETDEWEB)

    Altini, V [INFN, Dipartimento di Fisica dell' Universita and Sezione INFN Bary (Italy); Carena, F; Carena, W; Chapeland, S; Barroso, V Chibante; Costa, F; Divia, R; Fuchs, U; Makhlyueva, I; Roukoutakis, F; Schossmaier, K; Soos, C; Vyvre, P Vande; Haller, B Von, E-mail: Vasco.Chibante.Barroso@cern.c [CERN, Physics Department, Geneva (Switzerland)

    2010-04-01

    All major experiments need tools that provide a way to keep a record of the events and activities, both during commissioning and operations. In ALICE (A Large Ion Collider Experiment) at CERN, this task is performed by the Alice Electronic Logbook (eLogbook), a custom-made application developed and maintained by the Data-Acquisition group (DAQ). Started as a statistics repository, the eLogbook has evolved to become not only a fully functional electronic logbook, but also a massive information repository used to store the conditions and statistics of the several online systems. It's currently used by more than 600 users in 30 different countries and it plays an important role in the daily ALICE collaboration activities. This paper will describe the LAMP (Linux, Apache, MySQL and PHP) based architecture of the eLogbook, the database schema and the relevance of the information stored in the eLogbook to the different ALICE actors, not only for near real time procedures but also for long term data-mining and analysis. It will also present the web interface, including the different used technologies, the implemented security measures and the current main features. Finally it will present the roadmap for the future, including a migration to the web 2.0 paradigm, the handling of the database ever-increasing data volume and the deployment of data-mining tools.

  7. Around ALICE

    CERN Multimedia

    2004-01-01

    On the occasion of CERN's Golden Jubilee at Centre Culturel Jean Monnet de Saint-Genis-Pouilly Exposition from Monday 11 October to Sunday 24 October A presentation of CERN and the ALICE experiment with photos, student-made projects, computer animations, virtual reality demonstrations, and more. Saturday 16 October* Planting of a commemorative tree at 16:00 Public presentation at 16:30, followed by a visit to the subterranean site of the ALICE experiment (Number of places limited, reservations at: Service Culturel de la Marie de Saint-Genis-Pouilly, tel 04 50 20 52 59, or the Office de Tourisme Saint-Genis-Pouilly, tel: 04 50 42 29 37) * for the occasion of the Open Day, with 50 sites at CERN, see: http://intranet.cern.ch/Chronological/2004/CERN50/openday/openday_en.html

  8. Around ALICE

    CERN Multimedia

    2004-01-01

    http://www.cern.ch/cern50/ On the occasion of CERN's Golden Jubilee, at the Centre culturel Jean Monnet de Saint-Genis-Pouilly Exposition from Monday 11 October to Sunday 24 October. A presentation of CERN and the ALICE experiment with photos, student-made projects, computer animations, virtual reality demonstrations, and more. Saturday 16 October* Planting of a commemorative tree at 16:00 Public presentation at 16:30, followed by a visit to the subterranean site of the ALICE experiment (Number of places limited, reservations at: Service Culturel de la Marie de Saint-Genis-Pouilly, tél 04. 50. 20. 52. 59, Office de Tourisme Saint-Genis-Pouilly, tél: 04. 50. 42. 29. 37) * for the occasion of the Open Day, with 50 sites at CERN, see: http://intranet.cern.ch/Chronological/2004/CERN50/

  9. Fitting ALICE

    CERN Multimedia

    2004-01-01

    The support structures for the detectors inside the ALICE solenoid magnet (the L3 magnet) were finished in December 2003. After commissioning and testing, over the next year, the structures will be lowered into the cavern and installed in the magnet by spring 2005. At first sight you might mistake them for scaffolding. But a closer look reveals unusual features: Two are made of austenitic (non-magnetic) stainless steel with a cross section that looks like an "H". Another is made of 8 centimetre aluminium square tubes. "Them" are the support structures for the detectors and services inside the ALICE solenoid magnet (the L3 magnet) which were finished in December 2003. «The physicists don't want to have a lot of material close to their detectors; it has to be as few as possible,» says Diego Perini, who is responsible for the common support structures of ALICE. «We therefore had the very difficult task to design something relatively light that i...

  10. The GAP-TPC

    CERN Document Server

    Rossi, B; Boiano, A; Catalanotti, S; Cocco, A G; Covone, G; Di Meo, P; Longo, G; Vanzanella, A; Walker, S; Wang, H; Wang, Y; Fiorillo, G

    2016-01-01

    Several experiments have been conducted worldwide, with the goal of observing low-energy nuclear recoils induced by WIMPs scattering off target nuclei in ultra-sensitive, low-background detectors. In the last few decades noble liquid detectors designed to search for dark matter in the form of WIMPs have been extremely successful in improving their sensitivities and setting the best limits. One of the crucial problems to be faced for the development of large size (multi ton-scale) liquid argon experiments is the lack of reliable and low background cryogenic PMTs: their intrinsic radioactivity, cost, and borderline performance at 87 K rule them out as a possible candidate for photosensors. We propose a brand new concept of liquid argon-based detector for direct dark matter search: the Geiger-mode Avalanche Photodiode Time Projection Chamber (GAP-TPC) optimized in terms of residual radioactivity of the photosensors, energy and spatial resolution, light and charge collection efficiency

  11. The Gap-Tpc

    Science.gov (United States)

    Rossi, B.; Anastasio, A.; Boiano, A.; Catalanotti, S.; Cocco, A. G.; Covone, G.; Di Meo, P.; Longo, G.; Vanzanella, A.; Walker, S.; Wang, H.; Wang, Y.; Fiorillo, G.

    2016-02-01

    Several experiments have been conducted worldwide, with the goal of observing low-energy nuclear recoils induced by WIMPs scattering off target nuclei in ultra-sensitive, low-background detectors. In the last few decades noble liquid detectors designed to search for dark matter in the form of WIMPs have been extremely successful in improving their sensitivities and setting the best limits. One of the crucial problems to be faced for the development of large size (multi ton-scale) liquid argon experiments is the lack of reliable and low background cryogenic PMTs: their intrinsic radioactivity, cost, and borderline performance at 87 K rule them out as a possible candidate for photosensors. We propose a brand new concept of liquid argon-based detector for direct dark matter search: the Geiger-mode Avalanche Photodiode Time Projection Chamber (GAP-TPC) optimized in terms of residual radioactivity of the photosensors, energy and spatial resolution, light and charge collection efficiency.

  12. Identification of Low Momentum Electrons in The Time Projection Chamber of The ALICE Detector.

    CERN Document Server

    Mwewa, Chilufya

    2013-01-01

    This paper presents results obtained in the study to identify noisy low momentum electrons in the Time Projection Chamber (TPC) of the ALICE detector. To do this, the Circle Hough Transform is employed under the openCV library in python programming. This is tested on simulated tracks in the transverse view of the TPC. It is found that the noisy low momentum electrons can be identified and their exact positions in the transverse plane can be obtained.

  13. Pentaquark searches with ALICE

    CERN Document Server

    Bobulska, Dana

    2016-01-01

    In this report we present the results of the data analysis for searching for possible invariant mass signals from pentaquarks in the ALICE data. Analysis was based on filtered data from real p-Pb events at psNN=5.02 TeV collected in 2013. The motivation for this project was the recent discovery of pentaquark states by the LHCb collaboration (c ¯ cuud resonance P+ c ) [1]. The search for similar not yet observed pentaquarks is an interesting research topic [2]. In this analysis we searched for a s ¯ suud pentaquark resonance P+ s and its possible decay channel to f meson and proton. The ALICE detector is well suited for the search of certain candidates thanks to its low material budget and strong PID capabilities. Additionally we might expect the production of such particles in ALICE as in heavy-ion and proton-ion collisions the thermal models describes well the particle yields and ratios [3]. Therefore it is reasonable to expect other species of hadrons, including also possible pentaquarks, to be produced w...

  14. First detector installed inside the ALICE solenoid...

    CERN Multimedia

    2006-01-01

    ALICE's emblematic red magnet welcomed its first detector on 23 September, when the array of seven Cherenkov detectors, named HMPID, was successfully installed. ALICE team members standing in front of the completed HMPID detector.The red magnet, viewed from its front opening. The HMPID unit, seen from the back (top right corner of photo) is placed on a frame and lifted onto a platform during the installation. After the installation of the ACORDE scintillator array and the muon trigger and tracking chambers, the ALICE collaboration fitted the first detector inside the solenoid. The HMPID, for High Momentum Particle Identification, was installed at the 2 o'clock position in the central and most external region of the space frame, just below the solenoid yoke. It will be used to extend the hadron identification capability of the ALICE experiment up to 5 GeV/c, thus complementing the reach of the other particle identification systems (ITS, TPC and TOF). The HMPID is a Ring Imaging Cherenkov (RICH) detector in a...

  15. ALICE Cosmic Ray Detector

    CERN Multimedia

    Fernandez Tellez, A; Martinez Hernandez, M; Rodriguez Cahuantzi, M

    2013-01-01

    The ALICE underground cavern provides an ideal place for the detection of high energy atmospheric muons coming from cosmic ray showers. ACORDE detects cosmic ray showers by triggering the arrival of muons to the top of the ALICE magnet.

  16. ALICE HMPID Radiator Vessel

    CERN Multimedia

    2003-01-01

    View of the radiator vessels of the ALICE/HMPID mounted on the support frame. Each HMPID module is equipped with 3 indipendent radiator vessels made out of neoceram and fused silica (quartz) windows glued together. The spacers inside the vessel are needed to stand the hydrostatic pressure. http://alice-hmpid.web.cern.ch/alice-hmpid

  17. Layout of the ALICE detector (A Large Ion Collision Experiment), an experiment of the LHC

    CERN Multimedia

    2004-01-01

    The ALICE Set-up : 1. ITS 2. FMD 3. TPC 4. TRD 5. TOF 6. HMPID 7. PHOS CPV 8. L3magnet 9. Absorber 10. Tracking Chambers 11. Muon Filter 12. Trigger Chambers 13. Dipole Magnet 14. PMD 15. Compensator Magnet

  18. Overview of recent ALICE results

    CERN Document Server

    Gunji, Taku

    2016-01-01

    The ALICE experiment explores the properties of strongly interacting QCD matter at extremely high temperatures created in Pb-Pb collisions at LHC and provides further insight into small-system physics in (high-multiplicity) pp and p-Pb collisions. The ALICE collaboration presented 27 parallel talks, 50 posters, and 1 flash talk at Quark Matter 2015 and covered various topics including collective dynamics, correlations and fluctuations, heavy flavors, quarkonia, jets and high $p_{\\rm T}$ hadrons, electromagnetic probes, small system physics, and the upgrade program. This paper highlights some of the selected results.

  19. Overview of recent ALICE results

    Science.gov (United States)

    Gunji, Taku

    2016-12-01

    The ALICE experiment explores the properties of strongly interacting QCD matter at extremely high temperatures created in Pb-Pb collisions at LHC and provides further insight into small-system physics in (high-multiplicity) pp and p-Pb collisions. The ALICE collaboration presented 27 parallel talks, 50 posters, and 1 flash talk at Quark Matter 2015 and covered various topics including collective dynamics, correlations and fluctuations, heavy flavors, quarkonia, jets and high pT hadrons, electromagnetic probes, small system physics, and the upgrade program. This paper highlights some of the selected results.

  20. A Bayesian approach to particle identification in ALICE

    CERN Document Server

    CERN. Geneva

    2016-01-01

    Among the LHC experiments, ALICE has unique particle identification (PID) capabilities exploiting different types of detectors. During Run 1, a Bayesian approach to PID was developed and intensively tested. It facilitates the combination of information from different sub-systems. The adopted methodology and formalism as well as the performance of the Bayesian PID approach for charged pions, kaons and protons in the central barrel of ALICE will be reviewed. Results are presented with PID performed via measurements of specific energy loss (dE/dx) and time-of-flight using information from the TPC and TOF detectors, respectively. Methods to extract priors from data and to compare PID efficiencies and misidentification probabilities in data and Monte Carlo using high-purity samples of identified particles will be presented. Bayesian PID results were found consistent with previous measurements published by ALICE. The Bayesian PID approach gives a higher signal-to-background ratio and a similar or larger statist...

  1. ALICE's first vacuum bakeout a success

    CERN Multimedia

    2007-01-01

    At the beginning of April, the ALICE central beryllium beam pipe and absorber beam pipes were successfully conditioned. The installation and bakeout shell surround the beam pipe (lower left), running through the middle of the ITS and TPC. Notice the high-tech cooling system, an additional precaution to avoid overheating the ALICE detection equipment.One end of the vacuum sector during the bakeout and pure gas refill. It is unusual for a vacuum sector to end as it does in the middle of a non-accessible detector and made the installation and cabling of the bakeout equipment a more difficult procedure. Just before Easter, the first bakeout and NEG activation of experimental chambers in the LHC was carried out, followed by ultra pure gas refill. The bakeout consisted of externally heating the chambers under vacuum in order to lower their outgassing. This same heating process also activates the NEG, a coating on the inside surface of the beam vacuum chambers, which pumps the residual gas. ALICE's bakeout was pa...

  2. ALICE brochure (French version)

    CERN Multimedia

    Lefevre, Christiane

    2011-01-01

    ALICE is one of the four big experiments for the LHC, the most powerful particle accelerator in the world, which started up in 2008. ALICE will study the quark-gluon plasma, a state of matter that probably existed in the first moments of the universe.

  3. ALICE brochure (English version)

    CERN Multimedia

    Lefevre, C

    2012-01-01

    ALICE is one of the four big experiments for the LHC, the most powerful particle accelerator in the world, which started up in 2008. ALICE will study the quark-gluon plasma, a state of matter that probably existed in the first moments of the universe.

  4. ALICE brochure (French version)

    CERN Multimedia

    Lefevre, C

    2012-01-01

    ALICE is one of the four big experiments for the LHC, the most powerful particle accelerator in the world, which started up in 2008. ALICE will study the quark-gluon plasma, a state of matter that probably existed in the first moments of the universe.

  5. ALICE brochure (English version)

    CERN Multimedia

    Marcastel, Fabienne

    2014-01-01

    ALICE is one of the four big experiments for the LHC, the most powerful particle accelerator in the world, which started up in 2008. ALICE studies the quark-gluon plasma, a state of matter that probably existed in the first moments of the universe.

  6. ALICE brochure (German version)

    CERN Multimedia

    Lefevre, C

    2012-01-01

    ALICE is one of the four big experiments for the LHC, the most powerful particle accelerator in the world, which started up in 2008. ALICE will study the quark-gluon plasma, a state of matter that probably existed in the first moments of the universe.

  7. "Alice imedemaal" Vanemuises

    Index Scriptorium Estoniae

    2004-01-01

    7. veebr. esietendub Vanemuises tantsulavastus "Alice imedemaal". Etendus põhineb briti kirjaniku L. Carrolli samanimelisel lasteraamatul, koreograaf M. Murdmaa, kunstnik K. Jancis ja muusika on kirjutanud ungari helilooja S. Kall̤s, Alice'i osa tantsib korealanna Hye Min Kim

  8. ALICE brochure (Norwegian version)

    CERN Multimedia

    Lefevre, C

    2009-01-01

    ALICE is one of the four big experiments for the LHC, the most powerful particle accelerator in the world, which will start up in 2008. ALICE will study the quark-gluon plasma, a state of matter that probably existed in the first moments of the universe.

  9. ALICE brochure (Spanish version)

    CERN Multimedia

    Lefevre, C

    2008-01-01

    ALICE is one of the four big experiments for the LHC, the most powerful particle accelerator in the world, which will start up in 2008. ALICE will study the quark-gluon plasma, a state of matter that probably existed in the first moments of the universe.

  10. ALICE brochure (Polish version)

    CERN Multimedia

    Lefevre, C

    2008-01-01

    ALICE is one of the four big experiments for the LHC, the most powerful particle accelerator in the world, which will start up in 2008. ALICE will study the quark-gluon plasma, a state of matter that probably existed in the first moments of the universe.

  11. Latest work in the ALICE Experiment - July 2009

    CERN Multimedia

    CERN Video Productions

    2009-01-01

    Having already performed a lengthy cosmic ray test run, ALICE decided to immediately start consolidation work after the shutdown last autumn. “We wanted to use the additional time for improvements and upgrades," explains Paul Kuijer, ALICE Deputy Spokesperson, “for example, we realised that the access to the main tracking device, the TPC, was rather difficult, which could lead to unreasonably long service and repair times in the future, so we spent a lot of time moving all the cabling of the inner tracking system to give more space and better access.” This was a major operation, running from October 2008 until July 2009. All cables and services have been re-tested and the inner tracking system is again on-line. Future maintenance was pre-empted in other areas too, such as replacing a number of capacitors on the time projection chamber (TPC), which were suspected to have a reduced lifetime. The shutdown also gave ALICE the chance to install several new detector systems that were originally scheduled for ...

  12. ALICE Masterclass on strangeness

    Directory of Open Access Journals (Sweden)

    Foka Panagiota

    2014-04-01

    Full Text Available An educational activity, the International Particle Physics Masterclasses, was developed by the International Particle Physics Outreach Group with the aim to bring the excitement of cutting-edge particle-physics research into the classroom. Thousands of pupils, every year since 2005, in many countries all over the world, are hosted in research centers or universities close to their schools and become “scientists for a day” as they are introduced to the mysteries of particle physics. The program of a typical day includes lectures that give insight to topics and methods of fundamental research followed by a “hands-on” session where the high-school students perform themselves measurements on real data from particle-physics experiments. The last three years data from the ALICE experiment at LHC were used. The performed measurement “strangeness enhancement” and the employed methodology are presented.

  13. Controls Interfaces for Two ALICE Subsystems

    Science.gov (United States)

    Thomen, Robert

    2007-10-01

    Software for the control of a laser alignment system for the Inner Tacking System (ITS) and for the Electromagnetic Calorimeter (EMC) was developed for the ALICE (A Large Ion Collider Experiment) at CERN. The interfaces for both subsystems use the CERN-standard hardware controls system PVSS (Prozessvisualisierungs- und Steuerungs-System). Software for the ITS has been created to measure the relative alignment of the ITS with the Time Projection Chamber (TPC) so to ensure accurate particle tracking. The ITS alignment system locates laser images in four cameras. The EMC requires several subsystems to be running in order to operate properly. Software has been created and tested for the detector's high and low voltage systems, and temperature monitoring hardware. The ITS and EMC software specifications and design requirements are presented and their performance is analyzed.

  14. Front-end electronics and readout system for the ILD TPC

    CERN Document Server

    Hedberg, V; Lundberg, B; Mjörnmark, U; Oskarsson, A; Österman, L; De Lentdecker, G; Yang, Y; Zhang, F

    2015-01-01

    A high resolution TPC is the main option for a central tracking detector at the future International Linear Collider (ILC). It is planned that the MPGD (Micro Pattern Gas Detector) technology will be used for the readout. A Large Prototype TPC at DESY has been used to test the performance of MPGDs in an electron beam of energies up to 6 GeV. The first step in the technology development was to demonstrate that the MPGDs are able to achieve the necessary performance set by the goals of ILC. For this ’proof of principle’ phase, the ALTRO front-end electronics from the ALICE TPC was used, modified to adapt to MPGD readout. The proof of principle has been verified and at present further improvement of the MPGD technology is going on, using the same readout electronics. The next step is the ’feasibility phase’, which aims at producing front-end electronics comparable in size (few mm2) to the readout pads of the TPC. This development work is based on the succeeding SALTRO16 chip, which combines the analogue ...

  15. The PANDA GEM-based TPC prototype

    Energy Technology Data Exchange (ETDEWEB)

    Fabbietti, L., E-mail: laura.fabbietti@ph.tum.d [Excellence Cluster ' Universe' , Technische Universitaet Muenchen, Boltztmannstr. 2, Garching bei Muenchen 85748 (Germany); Angerer, H. [Physik Department E18, Technische Universitaet Muenchen, 85748 Muenchen (Germany); Arora, R. [Detektor Labor des GSI Helmholtzzentrum fuer Schwerionenforschung GmbH, 64291 Darmstadt (Germany); Beck, R. [Helmholtz-Institut fuer Strahlen- und Kernphysik, 53115 Bonn (Germany); Berger, M. [Excellence Cluster ' Universe' , Technische Universitaet Muenchen, Boltztmannstr. 2, Garching bei Muenchen 85748 (Germany); Buehler, P.; Cargnelli, M. [Stefan-Meyer Institute fuer subatomare Physik, 1090 Vienna (Austria); Doerheim, S. [Physik Department E18, Technische Universitaet Muenchen, 85748 Muenchen (Germany); Hehner, J. [Detektor Labor des GSI Helmholtzzentrum fuer Schwerionenforschung GmbH, 64291 Darmstadt (Germany); Herrmann, N. [FOPI Collaboration, GSI Helmholtzzentrum fuer Schwerionenforschung GmbH, 64291 Darmstadt (Germany); Hoeppner, C. [Physik Department E18, Technische Universitaet Muenchen, 85748 Muenchen (Germany); Kaiser, D. [Helmholtz-Institut fuer Strahlen- und Kernphysik, 53115 Bonn (Germany); Ketzer, B. [Physik Department E18, Technische Universitaet Muenchen, 85748 Muenchen (Germany); Mladen, K. [FOPI Collaboration, GSI Helmholtzzentrum fuer Schwerionenforschung GmbH, 64291 Darmstadt (Germany); Kleipa, V. [Detektor Labor des GSI Helmholtzzentrum fuer Schwerionenforschung GmbH, 64291 Darmstadt (Germany); Konorov, I. [Physik Department E18, Technische Universitaet Muenchen, 85748 Muenchen (Germany); Kunkel, J. [Detektor Labor des GSI Helmholtzzentrum fuer Schwerionenforschung GmbH, 64291 Darmstadt (Germany); Lalik, R. [Excellence Cluster ' Universe' , Technische Universitaet Muenchen, Boltztmannstr. 2, Garching bei Muenchen 85748 (Germany); Lang, M. [Helmholtz-Institut fuer Strahlen- und Kernphysik, 53115 Bonn (Germany)

    2011-02-01

    We report on the development of a GEM-based TPC detector prototype for the PANDA experiment. The design and requirements of this device will be illustrated, with particular emphasis on the properties of the recently tested GEM-detector, the characterization of the read-out electronics and the development of the tracking software that allows to evaluate the GEM-TPC data.

  16. ALICE honours industries

    CERN Multimedia

    2006-01-01

    The third annual ALICE Awards ceremony recognizes three companies for their contribution to the experiment's detector. The ALICE Awards winners pictured with CERN Secretary-General, Maximilian Metzger, during the ceremony. Three industries were honoured at the ALICE Awards ceremony on 17 March for their exceptional work on the collaboration's detector. Representatives from the companies accepted their awards at the ceremony, which was also attended by CERN Secretary-General Maximilian Metzger and members of the ALICE Collaboration Board. VTT Microelectronics of Finland received an award for the production of the thin bump bonded ladders (detector arrays, each consisting of 40 960 active cells) for the silicon pixel detector (SPD) in the inner tracking system. A number of technical hurdles had to be overcome: complex and expensive equipment was procured or upgraded, and processes underwent a detailed study and careful tuning. The ladders have a high and stable yield and the production will soon be completed...

  17. ALICE HMPID RICH

    CERN Multimedia

    2003-01-01

    Particle identification plays a key role in the complete understanding of heavy-ion collisions in ALICE at the LHC. . The CsI Photodetector . The Radiator . The Front-End Electronics . Detector performance

  18. ALICE Forward Multiplicity Detector

    CERN Multimedia

    Christensen, C

    2013-01-01

    The Forward Multiplicity Detector (FMD) extends the coverage for multiplicity of charge particles into the forward regions - giving ALICE the widest coverage of the 4 LHC experiments for these measurements.

  19. Analysis of cosmic-ray events with ALICE at LHC

    Directory of Open Access Journals (Sweden)

    Rodríguez Cahuantzi M.

    2015-01-01

    Full Text Available ALICE is one of the four main experiments of the LHC at CERN. Located 40 meters underground, with 30 m of overburden rock, it can also operate to detect muons produced by cosmic-ray interactions in the atmosphere. An analysis of the data collected with cosmic-ray triggers from 2010 to 2013, corresponding to about 31 days of live time, is presented. Making use of the ability of the Time Projection Chamber (TPC to track large numbers of charged particles, a special emphasis is given to the study of muon bundles, and in particular to events with high-muon density.

  20. Overview of ALICE results

    CERN Document Server

    Ortiz, Antonio

    2015-01-01

    The ALICE detector was designed to study the physics of matter under extreme conditions of high energy density. Different results were reported by the experiment using data from the successful run I of the LHC. The goal of the present work is to present an overview of recent ALICE results. This comprises selected results from several analyses of pp, p-pb and Pb-Pb data at the LHC energies.

  1. The ALICE absorbers

    CERN Multimedia

    Maximilien Brice

    2006-01-01

    Weighing more than 400 tonnes, the ALICE absorbers and the surrounding support structures have been installed and aligned with a precision of 1-2 mm, hardly an easy task but a very important one. The ALICE absorbers are made of three parts: the front absorber, a 35-tonne cone-shaped structure, and two small-angle absorbers, long straight cylinder sections weighing 18 and 40 tonnes. The three pieces lined up have a total length of about 17 m.

  2. Installing the ALICE detector

    CERN Multimedia

    Maximilien Brice

    2006-01-01

    The huge iron yoke in the cavern at Point 2 in the LHC tunnel is prepared for the installation of the ALICE experiment. The yoke is being reused from the previous L3 experiment that was located at the same point during the LEP project from 1989 to 2000. ALICE will be inserted piece by piece into the cradle where it will be used to study collisions between two beams of lead ions.

  3. Dolly and Alice.

    Science.gov (United States)

    Burk, Dan L

    2015-11-01

    The opinion of the United States Court of Appeals for the Federal Circuit, In re Roslin Institute, rejecting patent claims to mammals cloned from somatic cells, was rendered about a month before the United States Supreme Court's decision in Alice Corp. v. CLS Bank International. The Alice opinion explicitly sets out the standard for determining whether an invention falls within statutory patentable subject matter. Thus one is thus left to wonder what the Roslin opinion might have looked like had it been decided only a few weeks later, after the Alice decision was published, with the benefit of the Supreme Court's further direction on patentable subject matter. In this essay I explore whether in hindsight the Alice standard might have dictated a different outcome in Roslin, suggesting how the two-part test articulated by the Supreme Court in Alice might apply to a 'products of nature' analysis for cloned mammals. Drawing on that analysis, I then use the Roslin case as a vehicle to highlight certain issues with the Supreme Court's current subject matter jurisprudence as applied to biotechnology. By juxtaposing Dolly with Alice, it becomes clear that the Supreme Court has revivified a number of dormant biotechnology patent problems in the guise of subject matter analysis.

  4. ALICES: advanced software engineering workshop for real-time simulators

    Energy Technology Data Exchange (ETDEWEB)

    Noel, A.; Rouault, G. [Tractebel, Brussels (Belgium)

    1997-12-01

    The ALICES software workshop is presently being applied for the development of a multifunctional simulator for Belgium`s Tihange-1 nuclear power unit. This will be the best validation for all the functions included in the tools. It is believed that ALICES will permit the development of quality realtime simulators at a significantly lower price.

  5. First TPC-Energy Benchmark: Lessons Learned in Practice

    Science.gov (United States)

    Young, Erik; Cao, Paul; Nikolaiev, Mike

    TPC-Energy specification augments the existing TPC Benchmarks with Energy Metrics. The TPC-Energy specification is designed to help hardware buyers identify energy efficient equipment that meets both their computational and budgetary requirements. In this paper we discuss our experience is publishing industry's first-ever TPC-Energy metric publication.

  6. TPC track distortions III: fiat lux

    CERN Document Server

    Boyko, I; Dydak, F; Elagin, A; Gostkin, M; Guskov, A; Koreshev, V; Nefedov, Y; Nikolaev, K; Veenhof, R; Wotschack, J; Zhemchugov, A

    2005-01-01

    We present a comprehensive overview and final summary of all four types of static track distortions seen in the HARP TPC, in terms of physical origins, mathematical modelling, and correction algorithms. 'Static'™ distortions are defined as not depending on the event time within the 400 ms long accelerator spill. Calculated static distortions are compared with measurements from cosmic-muon tracks. We characterize track distortions by the r phi residuals of cluster positions with respect to the transverse projection of a helical trajectory constrained by hits in the RPC overlap regions. This method provides a fixed TPC-external reference system (by contrast to the co-moving coordinate system associated with a fit) which solely permits to identify individually, and measure quantitatively, the static TPC track distortions arising from (i) the inhomogeneity of the solenoidal magnetic field, (ii) the inhomogeneity of the electric field from the high-voltage mismatch between the inner and outer TPC field cages, (...

  7. ALICE - ARC integration

    DEFF Research Database (Denmark)

    Anderlik, Csaba; Gregersen, Anders Rhod; Kleist, Josva;

    AliEn or Alice Environment is the Gridware developed and used within the ALICE collaboration for storing and processing data in a distributed manner. ARC (Advanced Resource Connector) is the Grid middleware deployed across the Nordic countries and gluing together the resources within the Nordic...... Data Grid Facility (NDGF). In this paper we will present our approach to integrate AliEn and ARC, in the sense that ALICE data management and job processing can be carried out on the NDGF infrastructure, using the client tools available in AliEn. The interoperation has two aspects, one is the data...... management part and the second the job management aspect. The first aspect was solved by using dCache across NDGF to handle data. dCache provides support for several data management tools (among them for xrootd the tools used by AliEn) using the so called "doors". Therefore, we will concentrate on the second...

  8. ALICE opens its new nerve centre

    CERN Multimedia

    Antonella Del Rosso

    2014-01-01

    Twenty-nine fully equipped and ergonomic workstations, one meeting area and 11 large format screens in a completely refurbished room: the ALICE Run Control Centre (ARC) implements the best and newest solutions for its shift workers and expert operators, including access for persons with reduced mobility and very soon a magic window for Point 2 visitors.   The ALICE Run Control Centre. “Our initial intention was just to optimise the old layout,” says Federico Ronchetti from Laboratori Nazionali di Frascati (Italy), a CERN scientific associate currently appointed as ALICE Run Coordinator and person in charge of the ALICE Consolidation Task Force. “However, during the review process, we carried out a study of all the existing control rooms at CERN and became aware we needed a radical change. Hence we started planning a complete redesign of the workspace.” Designed and equipped over many years, the old ALICE control room did not have enough space to fit al...

  9. Heavy flavour in ALICE

    CERN Document Server

    Pillot, Philippe

    2008-01-01

    Open heavy flavours and heavy quarkonium states are expected to provide essential informa- tion on the properties of the strongly interacting system fo rmed in the early stages of heavy-ion collisions at very high energy density. Such probes are espe cially promising at LHC energies where heavy quarks (both c and b) are copiously produced. The ALICE detector shall measure the production of open heavy flavours and heavy quarkonium st ates in both proton-proton and heavy-ion collisions at the LHC. The expected performances of ALICE for heavy flavour physics is discussed based on the results of simulation studies on a s election of benchmark channels

  10. ALICE High Level Trigger

    CERN Multimedia

    Alt, T

    2013-01-01

    The ALICE High Level Trigger (HLT) is a computing farm designed and build for the real-time, online processing of the raw data produced by the ALICE detectors. Events are fully reconstructed from the raw data, analyzed and compressed. The analysis summary together with the compressed data and a trigger decision is sent to the DAQ. In addition the reconstruction of the events allows for on-line monitoring of physical observables and this information is provided to the Data Quality Monitor (DQM). The HLT can process event rates of up to 2 kHz for proton-proton and 200 Hz for Pb-Pb central collisions.

  11. GRID Activities in ALICE

    Institute of Scientific and Technical Information of China (English)

    P.Cerello; T.Anticic; 等

    2001-01-01

    The challenge of LHC computing,with data rates in the range of several PB/year,requires the development of GRID technologies,to optimize the exploitation of distributed computing power and the authomatic access to distributed data storage.In the framework of the EU-DataGrid project,the ALICE experiment is one of the selected test applications for the early development and implementation of GRID Services.Presently,about 15 ALICE sites are makin use of available GRID tools and a large scale test production involving 9 of them was carried out with our simulation program.Results are discussed in detail,as well as future plans.

  12. ALICE Geometry Database

    CERN Document Server

    Santo, J

    1999-01-01

    The ALICE Geometry Database project consists of the development of a set of data structures to store the geometrical information of the ALICE Detector. This Database will be used in Simulation, Reconstruction and Visualisation and will interface with existing CAD systems and Geometrical Modellers.At the present time, we are able to read a complete GEANT3 geometry, to store it in our database and to visualise it. On disk, we store different geometry files in hierarchical fashion, and all the nodes, materials, shapes, configurations and transformations distributed in this tree structure. The present status of the prototype and its future evolution will be presented.

  13. GEANT4 in ALICE

    CERN Document Server

    Hrivnacova, I

    1999-01-01

    The smooth way of transition from existing GEANT3 based simulation software to GEANT4 adopted by ALICE will be explained. The AliRoot package as a client of the Monte Carlo interface (pure abstract class) is used in GEANT4 based classes for building GEANT4 objects (geometry physics list, primary generator). We shall also summarise our experience with GEANT4 and give an overview of what parts of GEANT4 are used in the current ALICE GEANT4 simulation prototype, what functionality has been added and what problems have been encountered.

  14. ALICE physicists receive 2014 Lise Meitner Prize

    CERN Multimedia

    Katarina Anthony

    2014-01-01

    On Wednesday, 3 September, four ALICE physicists were presented with the European Physical Society's 2014 Lise Meitner Prize for their outstanding contributions to nuclear physics (see here).   ALICE collaboration members Johanna Stachel (Heidelberg University, Germany), Peter Braun-Munzinger (GSI, Germany), Paolo Giubellino (INFN Turin, Italy, and CERN) and Jürgen Schukraft (CERN) were presented with their awards at a private ceremony held in the Globe of Science and Innovation. In addition to members of the ALICE collaboration, the ceremony was attended by members of the CERN Management including the Director-General, Rolf Heuer, as well as the EPS Nuclear Physics Board Chair, Douglas MacGregor, and the EPS Lise Meitner Prize Committee Chair, Victor Zamfir. For more information, please see "EPS honours CERN's heavy-ion researchers".  From left to right: Douglas MacGregor (EPS); Prize recipients Jürgen Schukraft,&a...

  15. Open access for ALICE analysis based on virtualization technology

    CERN Document Server

    Buncic, P; Schutz, Y

    2015-01-01

    Open access is one of the important leverages for long-term data preservation for a HEP experiment. To guarantee the usability of data analysis tools beyond the experiment lifetime it is crucial that third party users from the scientific community have access to the data and associated software. The ALICE Collaboration has developed a layer of lightweight components built on top of virtualization technology to hide the complexity and details of the experiment-specific software. Users can perform basic analysis tasks within CernVM, a lightweight generic virtual machine, paired with an ALICE specific contextualization. Once the virtual machine is launched, a graphical user interface is automatically started without any additional configuration. This interface allows downloading the base ALICE analysis software and running a set of ALICE analysis modules. Currently the available tools include fully documented tutorials for ALICE analysis, such as the measurement of strange particle production or the nuclear modi...

  16. Proton-proton physics in ALICE

    CERN Document Server

    Nayak, T K

    2007-01-01

    The ALICE experiment has several unique features which makes it an important contributor to proton-proton physics at the LHC, in addition to its specific design goal of studying the physics of strongly interacting matter in heavy-ion collisions. The unique capabilities include its low transverse momentum (\\pT) acceptance, excellent vertexing, particle identification over a broad \\pT range and jet reconstruction. In this report, a brief review of ALICE capabilities is given for studying bulk properties of produced particles which characterize the underlying events, and the physics of heavy-flavour, quarkonia, photons, di-leptons and jets.

  17. ALICE Vzero Detector

    CERN Multimedia

    Cheynis, B

    2013-01-01

    ALICE is the only experiment at CERN specifically designed to study the Quark-Gluon Plasma, the hot and dense matter which is created in ultra relativistic heavy-ion collisions. - VZERO-A (CINVESTAV-UNAM Mexico): 2.8 328 cm away from Interaction Point - VZERO-C (IPN Lyon): -3.6 88 cm away from Interaction Point

  18. First ALICE detectors installed!

    CERN Document Server

    2006-01-01

    Detectors to track down penetrating muon particles are the first to be placed in their final position in the ALICE cavern. The Alice muon spectrometer: in the foreground the trigger chamber is positioned in front of the muon wall, with the dipole magnet in the background. After the impressive transport of its dipole magnet, ALICE has begun to fill the spectrometer with detectors. In mid-July, the ALICE muon spectrometer team achieved important milestones with the installation of the trigger and the tracking chambers of the muon spectrometer. They are the first detectors to be installed in their final position in the cavern. All of the eight half planes of the RPCs (resistive plate chambers) have been installed in their final position behind the muon filter. The role of the trigger detector is to select events containing a muon pair coming, for instance, from the decay of J/ or Y resonances. The selection is made on the transverse momentum of the two individual muons. The internal parts of the RPCs, made o...

  19. ALICE-ARC integration

    DEFF Research Database (Denmark)

    Anderlik, Csaba; Gregersen, Anders Rhod; Kleist, Josva;

    2008-01-01

    Data Grid Facility (NDGF). In this paper we will present our approach to integrate AliEn and ARC, in the sense that ALICE data management and job processing can be carried out on the NDGF infrastructure, using the client tools available in AliEn. The interoperation has two aspects, one is the data...

  20. ALICE Silicon Strip Detector

    CERN Multimedia

    Nooren, G

    2013-01-01

    The Silicon Strip Detector (SSD) constitutes the two outermost layers of the Inner Tracking System (ITS) of the ALICE Experiment. The SSD plays a crucial role in the tracking of the particles produced in the collisions connecting the tracks from the external detectors (Time Projection Chamber) to the ITS. The SSD also contributes to the particle identification through the measurement of their energy loss.

  1. ALICE Photon Multiplicity Detector

    CERN Multimedia

    Nayak, T

    2013-01-01

    Photon Multiplicity Detector (PMD) measures the multiplicity and spatial distribution of photons in the forward region of ALICE on a event-by-event basis. PMD is a pre-shower detector having fine granularity and full azimuthal coverage in the pseudo-rapidity region 2.3 < η < 3.9.

  2. Alice - The Virtual Secretary

    DEFF Research Database (Denmark)

    Hansen, Thomas K.

    2009-01-01

    Animated Agents are increasingly finding their way into computer applications and websites. They create life on the screen for us, attempt to personalize our communication and rather than us being forced to read long website introductions, they can verbally introduce us to the content. One...... in order to create Alice – The virtual secretary....

  3. TPC track distortions IV: post tenebras lux

    CERN Document Server

    Ammosov, V; Boyko, I; Chelkov, G; Dedovitch, D; Dydak, F; Elagin, A; Gostkin, M; Guskov, A; Koreshev, V; Krumshtein, Z; Nefedov, Y; Nikolaev, K; Wotschack, J; Zhemchugov, A

    2007-01-01

    We present a comprehensive discussion and summary of static and dynamic track distortions in the HARP TPC in terms of physical origin, mathematical modelling and correction algorithms. `Static' distortions are constant with time, while `dynamic' distortions are distortions that occur only during the 400 ms long accelerator spill. The measurement of dynamic distortions, their mathematical modelling and the correction algorithms build on our understanding of static distortions. In the course of corroborating the validity of our static distortion corrections, their reliability and precision was further improved. Dynamic TPC distortions originate dominantly from the `stalactite' effect: a column of positive-ion charge starts growing at the begin of the accelerator spill, and continues growing with nearly constant velocity out from the sense-wire plane into the active TPC volume. However, the `stalactite' effect is not able to describe the distortions that are present already at the start of the spill and which ha...

  4. Monitoring and calibration of the ALICE time projection chamber

    CERN Document Server

    Larsen, Dag Toppe

    The aim of the A Large Ion Collider Experiment (ALICE) experiment at CERN is to study the properties of the Quark–Gluon Plasma (QGP). With energies up to 5.5 A T eV for Pb+Pb collisions, the Large Hadron Collider (LHC) sets a new benchmark for heavy- ion collisions, and opens the door to a so far unexplored energy domain. A closer look at some of the physics topics of ALICE is given in Chapter 1. ALICE consists of several sub-detectors and other sub-systems. The various sub- detectors are designed for exploring different aspects of the particle production of an heavy-ion collision. Chapter 2 gives some insight into the design. The main tracking detector is the Time Projection Chamber (TPC). It has more than half million read-out channels, divided into 216 Read-out Partitions (RPs). Each RP is a separate Front-End Electronics (FEE) entity, as described in Chapter 3. A complex Detector Control System (DCS) is needed for configuration, monitoring and control. The heart of it on the RP side is a small embedded ...

  5. ALICE Upgrades: Plans and Potentials

    CERN Document Server

    Tieulent, Raphael

    2015-01-01

    The ALICE collaboration consolidated and completed the installation of current detectors during LS1 with the aim to accumulate 1 nb$^{-1}$ of Pb-Pb collisions during Run 2 corresponding to about 10 times the Run 1 integrated luminosity. In parallel, the ALICE experiment has a rich detector upgrade programme scheduled during the second LHC long shutdown (LS2, 2018-2019) in order to fully exploit the LHC Runs 3 and 4. The main objectives of this programme are: improving the tracking precision and enabling the read-out of all Pb-Pb interactions at a rate of up to 50 kHz, with the goal to record an integrated luminosity of 10 nb$^{-1}$ after LS2 in minimum-bias trigger mode. This sample would represent an increase by a factor of one hundred with respect to the minimum-bias sample expected during Run 2. The implementation of this upgrade programme, foreseen in LS2, includes: a new low-material Inner Tracking System at central rapidity with a forward rapidity extension to add vertexing capabilities to the current M...

  6. The ALICE pixel detector

    CERN Document Server

    Mercado Perez, J

    2002-01-01

    The present document is a brief summary of the performed activities during the 2001 Summer Student Programme at CERN under the Scientific Summer at Foreign Laboratories Program organized by the Particles and Fields Division of the Mexican Physical Society (Sociedad Mexicana de Fisica). In this case, the activities were related with the ALICE Pixel Group of the EP-AIT Division, under the supervision of Jeroen van Hunen, research fellow in this group. First, I give an introduction and overview to the ALICE experiment; followed by a description of wafer probing. A brief summary of the test beam that we had from July 13th to July 25th is given as well. (3 refs).

  7. ALICE dipole and decoration

    CERN Multimedia

    Maximilien Brice

    2004-01-01

    The ALICE cavern receives a painting made specially to mark the 50th anniversary of CERN that is mounted on the L3 solenoid magnet, reused from the LEP experiment that ran from 1989 to 2000. The dipole, which is cooled by demineralised water, will bend the path of muons that leave the huge rectangular solenoid. These muons are heavy electrons that interact less with matter allowing them to be studied at large distances from the interaction point.

  8. ALICE photon spectrometer crystals

    CERN Multimedia

    Maximilien Brice

    2006-01-01

    Members of the mechanical assembly team insert the last few crystals into the first module of ALICE's photon spectrometer. These crystals are made from lead-tungstate, a crystal as clear as glass but with nearly four times the density. When a high-energy particle passes through one of these crystals it will scintillate, emitting a flash of light allowing the energy of photons, electrons and positrons to be measured.

  9. ALICE on the move

    CERN Multimedia

    CERN Bulletin

    2011-01-01

    A new management, new modules for its sub-detectors and an increased capacity to probe the properties of the quark-gluon plasma. The new year bodes well for ALICE and ion physics as quarks and gluons prepare to unveil their most profound mysteries.   Installation of one of the new EMCal modules in the detector. Paolo Giubellino, the new ALICE spokesperson, talks with enthusiasm about what has already been done by the ALICE collaboration and what is yet to come. He has recently taken over from Jurgen Schukraft, who led the collaboration from its earliest beginnings. “We had a very exciting first year of operation, with many interesting results coming up in a very short space of time,” says Giubellino, a heavy-ion-physics expert from the Italian National Institute for Nuclear Physics (see box for details). “The Christmas technical stop wasn’t a break for us as we upgraded the detector, completing the installation of the electromagnetic calorimeter (E...

  10. Performance study of the neutron-TPC

    Science.gov (United States)

    Huang, Meng; Li, Yulan; Niu, Libo; Deng, Zhi; Cheng, Xiaolei; He, Li; Zhang, Hongyan; Fu, Jianqiang; Yan, Yangyang; Cai, Yiming; Li, Yuanjing

    2017-02-01

    Fast neutron spectrometers will play an important role in the future of the nuclear industry and nuclear physics experiments, in tasks such as fast neutron reactor monitoring, thermo-nuclear fusion plasma diagnostics, nuclear reaction cross-section measurement, and special nuclear material detection. Recently, a new fast neutron spectrometer based on a GEM (Gas Electron Multiplier amplification)-TPC (Time Projection Chamber), named the neutron-TPC, has been under development at Tsinghua University. It is designed to have a high energy resolution, high detection efficiency, easy access to the medium material, an outstanding n/γ suppression ratio, and a wide range of applications. This paper presents the design, test, and experimental study of the neutron-TPC. Based on the experimental results, the energy resolution (FWHM) of the neutron-TPC can reach 15.7%, 10.3% and 7.0% with detection efficiency higher than 10‑5 for 1.2 MeV, 1.81 MeV and 2.5 MeV neutrons respectively. Supported by National Natural Science Foundation of China (11275109)

  11. Estimation of Weighting Potential for a TPC

    CERN Document Server

    Mukhopadhyay, S; Veenhof, R

    2007-01-01

    In this work, we have computed the three dimensional weighting potential, field and pad response function (PRF) of typical time projection chambers (TPC) using a recently formulated and developed boundary element method solver, namely, the nearly exact BEM solver. A realistic geometry of the device is found to have significant influence on the estimation of signal generation.

  12. TPC1 - SV Channels Gain Shape

    Institute of Scientific and Technical Information of China (English)

    Rainer Hedrich; Irene Marten

    2011-01-01

    T The most prominent ion channel localized in plant vacuoles is the slow activating SV type. Slow vacuolar (SV)channels were discovered by patch clamp studies as early as 1986. In the following two decades, numerous studies revealed that these calcium- and voltage-activated, nonselective cation channels are expressed in the vacuoles of all plants and every plant tissue. The voltage-dependent properties of the SV channel are susceptible to modulation by calcium, pH, redox state, as well as regulatory proteins. In Arabidopsis, the SV channel is encoded by the AtTPC1 gene, and even though its gene product represents the by far largest conductance of the vacuolar membrane, tpc1-loss-of-function mutants appeared not to be impaired in major physiological functions such as growth, development, and reproduction. In contrast, the fou2 gain-of-function point mutation D454N within TPC1 leads to a pronounced growth phenotype and increased synthesis of the stress hormone jasmonate. Since the TPC1 gene is present in all land plants, it likely encodes a very general function. In this review, we will discuss major SV channel properties and their impact on plant cell physiology.

  13. Upgrade Strategy for ALICE at High Rate

    CERN Document Server

    Musa, L

    2012-01-01

    The longterm goal of the ALICE experiment is to provide a precise characterization of the Quark-Gluon Plasma (QGP) state. Such a determination of its properties including initial temperature, degrees of freedom, speed of sound, and in general, transport coefficients would be a major achievement. This would go a long way towards a better understanding of QCD as a genuine multi-particle theory. To achieve this goal, high statistics measurements are required, which will give access also to the very rare physics channels needed to understand the dynamics of this condensed phase of QCD. The general upgrade strategy for the ALICE central barrel is conceived to deal with this challenge with expected Pb-Pb interaction rates of up to 50 kHz, that would provide an accumulated sample of the order of 10 nb^-1 in the period 2019-2023. In this document we sketch the modifications/replacements needed in all ALICE central barrel detectors and online systems (Trigger, DAQ and HLT) for high luminosity running. As the ALICE for...

  14. ALICE doffs hat to two companies

    CERN Multimedia

    2007-01-01

    During the fifth annual ALICE Industrial Awards ceremony, the ALICE Collaboration honoured two companies for their outstanding contributions to the construction of the experiment.For the past five years, the ALICE collaboration has been presenting its industrial partners with awards for meeting demanding or unusual requirements, for excellence in design or execution, for delivery on-time and on-budget and for outstanding cooperation. This year, on 9 March, ALICE presented awards to two companies for their exceptional performance. From left to right: Kees Oskamp (ALICE SSD), Arie de Haas (ALICE SSD), Gert-Jan Nooren (ALICE SSD), Shon Shmuel (FIBERNET), Yehuda Mor-Yosef (FIBERNET), Hans Boggild (ALICE), Jurgen Schukraft (ALICE Spokesperson), Catherine Decosse (ALICE) and Jean-Robert Lutz (ALICE SSD). FIBERNET Ltd., based in Yokneam, Israel, was rewarded for the excellent and timely assembly of the Silicon Strip Detector boards (SSD) of the Inner Tracking System with cable connections. Special low-mass cables, ...

  15. Imaging in (high pressure) Micromegas TPC detectors

    Science.gov (United States)

    Luzón, G.; Cebrián, S.; Castel, J.; Dafni, Th.; Galán, J.; Garza, J. G.; Irastorza, I. G.; Iguaz, F. J.; Mirallas, H.; Ruíz-Choliz, E.

    2016-11-01

    The T-REX project of the group of the University of Zaragoza includes a number of R&D and prototyping activities to explore the applicability of gaseous Time Projection Chambers (TPCs) with Micromesh Gas Structures (Micromegas) in rare event searches where the pattern recognition of the signal is crucial for background discrimination. In the CAST experiment (CERN Axion Solar Telescope) a background level as low as 0.8 × 10-6 counts keV-1 cm-2 s-1 was achieved. Prototyping and simulations promise a 105 better signal-to-noise ratio than CAST for the future IAXO (International Axion Observatory) using x-ray telescopes. A new strategy is also explored in the search of WIMPS based on high gas pressure: the TREX-DM experiment, a low energy threshold detector. In both cases, axion and WIMP searches, the image of the expected signal is quite simple: a one cluster deposition coming from the magnet bore in the case of axions and, if possible, with a tadpole form in the case of WIMPs. It is the case of double beta decay (DBD) where imaging and pattern recognition play a major role. Results obtained in Xe + trimethylamine (TMA) mixture point to a reduction in electron diffusion which improves the quality of the topological pattern, with a positive impact on the discrimination capability, as shown in TREX-ββ prototype. Microbulk Micromegas are able to image the DBD ionization signature with high quality while, at the same time, measuring its energy deposition with a resolution of at least a ~ 3% FWHM at the transition energy Qββ and even better (up to ~ 1% FWHM) as extrapolated from low energy events. That makes Micromegas-based HPXe TPC a very competitive technique for the next generation DBD experiments (as PANDAX-III). Here, it will be shown the last results of the TREX project detectors and software concerning Axions, Dark matter and double beta decay.

  16. Activity report of ILD-TPC Asia group

    CERN Document Server

    Kato, Y; Gros, P; Tian, J; Kawada, S; Fujii, K; Matsuda, T; Sugiyama, A; Nitoh, O; Watanabe, T; Fusayasu, T; Takahashi, T; Kobayashi, M

    2014-01-01

    The purpose of ILD-TPC Asia group is realization of high precision Time Projection Chamber (TPC) with Gas Electron Multiplier (GEM) as a central tracker in International Linear Collider (ILC). We have been studying the many R&D items to build the real detector as a member of LCTPC collaboration. This paper describes the our efforts for realization of the ILD-TPC, the result of test beam using large prototype TPC, local field distortion, positive ion effects and gate devices, and cooling electronics which are key items to build ILD-TPC.

  17. ALICE honours two Italian suppliers

    CERN Multimedia

    2006-01-01

    During the ALICE week held in Bologna from 19 to 23 June, the Collaboration recognized two of its top suppliers. From left to right: Robert Terpin (MIPOT), Pier Luigi Bellutti (ITC), Andrea Zanotti, President of ITC, Luciano Bosisio (Trieste University), Gennady Zinovjev (Kiev), Catherine Decosse (CERN), Lodovico Riccati, ALICE Collaboration Board Chair (INFN Torino), Paolo Giubellino (INFN Torino), Mario Zen, Director of ITC, Maurizio Boscardin (ITC), Paolo Tonella (ITC), Jurgen Schukraft, ALICE Spokesperson (CERN), Giacomo Vito Margagliotti (Trieste University), Nevio Grion (INFN Trieste), Marco Bregant (INFN Trieste). Front row from left to right: Paolo Traverso (ITC), Federico Carminati, ALICE Computing Project Leader (CERN), and Jean-Robert Lutz, ITS-SSD Project leader (IPHC Strasbourg). It is in the picturesque city of Bologna that the ALICE Collaboration has rewarded two Italian suppliers, Istituto Trentino di Cultura ITC-irst (Trento) and MIPOT (Cormons), both involved in the construction of the Sili...

  18. Design of a neutron-TPC prototype and its performance evaluation based on an alpha-particle test

    Science.gov (United States)

    Huang, Meng; Li, Yu-Lan; Niu, Li-Bo; Li, Jin; Deng, Zhi; He, Li; Zhang, Hong-Yan; Cheng, Xiao-Lei; Fu, Jian-Qiang; Li, Yuan-Jing

    2015-08-01

    A neutron-TPC (nTPC) is being developed for use as a fast neutron spectrometer in the fields of nuclear physics, nuclear reactor operation monitoring, and thermo-nuclear fusion plasma diagnostics. An nTPC prototype based on a GEM-TPC (Time Projection Chamber with Gas Electron Multiplier amplification) has been assembled and tested using argon-hydrocarbon mixture as the working gas. By measuring the energy deposition of the recoil proton in the sensitive volume and the angle of the proton track, the incident neutron energy can be deduced. A Monte Carlo simulation was carried out to analyze the parameters affecting the energy resolution of the nTPC, and gave an optimized resolution under ideal conditions. An alpha particle experiment was performed to verify its feasibility, and to characterize its performance, including energy resolution and spatial resolution. Based on the experimental measurement and analysis, the energy resolution (FWHM) of the nTPC prototype is predicted to be better than 3.2% for 5 MeV incident neutrons, meeting the performance requirement (FWHM<5%) for the nTPC prototype.

  19. Diffraction studies with ALICE

    CERN Document Server

    Zamora, Pedro González

    2013-01-01

    The measurement of Single and Double Di raction cross-sections in pp collisions by the ALICE Collaboration at p s = 0.9, 2.76 and 7 TeV will be presented. The relevance of di raction to the understanding of inelastic pp interactions will be discussed and the measurement of the inelastic pp cross-section will be presented. A brief status of ALICE’s studies of centrally produced systems, selected with a two-pseudorapidity gap topology, will also be given

  20. Data science in ALICE

    CERN Document Server

    CERN. Geneva

    2015-01-01

    ALICE is the LHC experiment dedicated to the study of Heavy Ion collisions. In particular, the detector features low momentum tracking and vertexing, and comprehensive particle identification capabilities. In a single central heavy ion collision at the LHC, thousands of particles per unit rapidity are produced, making the data volume, track reconstruction and search of rare signals particularly challenging. Data science and machine learning techniques could help to tackle some of the challenges outlined above. In this talk, we will discuss some early attempts to use these techniques for the processing of detector signals and for the physics analysis. We will also highlight the most promising areas for the application of these methods.

  1. GEM Module Design for the ILD TPC

    CERN Document Server

    Benke, T; Münnich, A; Zenker, K

    2013-01-01

    A Time Projection Chamber (TPC) using micro-pattern gas detectors is planned as the main tracking device for a detector at the next Linear Collider. A novel support structure for Gas Electron Multipliers (GEMs), which minimizes the material and improves the flatness of the foils, has been developed and tested with multiple GEM modules in a large TPC prototype at DESY. Reducing dead material at the GEM module boundaries improves the field homogeneity. In addition, it was shown in simulation that a field shaping ring at the border of the module can improve the charge collection in regions with non-homogeneous fields. This shaping wire was integrated into the module design and a successful test beam campaign with three modules has been carried out. First results regarding resolution and field distortions will be discussed.

  2. Identified particle spectra measured by the ALICE experiment in pp collisions at 0.9 and 7 TeV at LHC

    Energy Technology Data Exchange (ETDEWEB)

    Belikov, Iouri [Institut Pluridisciplinaire Hubert Curien - IPHC, 23 rue du loess - BP28, 67037 Strasbourg cedex 2 (France); LOPEZ NORIEGA, Mercedes [Institut de Physique Nucleaire - IPN, 15 rue Georges Clemenceau, 91406 Orsay (France)

    2010-07-01

    We will present the transverse momentum spectra of identified particles measured with the ALICE experiment in proton-proton collisions at LHC recorded at the center-of-mass energies of 0.9 and 7 TeV. The spectra of the charged particles (p{+-}, K{+-}, p and p-bar) were obtained measuring the dE/dx in the ALICE TPC and ITS complemented at higher momenta by the time-of-flight information provided by the ALICE TOF detector. The spectra of the K{sup 0}{sub S}, and hyperons were reconstructed using the decay topology of these particles. These measurements demonstrate the exceptional operation of both the LHC machine and the ALICE experiment. On the physics side, they provide insights about the mechanisms of the particle production at these energies and will serve as a baseline for the future measurements at even higher LHC energies and for heavy-ion collisions. (authors)

  3. ALICE Expert System

    CERN Document Server

    Ionita, C

    2014-01-01

    The ALICE experiment at CERN employs a number of human operators (shifters), who have to make sure that the experiment is always in a state compatible with taking Physics data. Given the complexity of the system and the myriad of errors that can arise, this is not always a trivial task. The aim of this paper is to describe an expert system that is capable of assisting human shifters in the ALICE control room. The system diagnoses potential issues and attempts to make smart recommendations for troubleshooting. At its core, a Prolog engine infers whether a Physics or a technical run can be started based on the current state of the underlying sub-systems. A separate C++ component queries certain SMI objects and stores their state as facts in a Prolog knowledge base. By mining the data stored in dierent system logs, the expert system can also diagnose errors arising during a run. Currently the system is used by the on-call experts for faster response times, but we expect it to be adopted as a standard tool by reg...

  4. The Latest from ALICE

    CERN Document Server

    2009-01-01

    After intensive installation operations from October 2008 until July 2009 (see Bulletin 31/7/2009), ALICE started a full-detector cosmics run in August, which is scheduled to last until the end of October. In addition to the Silicon Pixel and ACORDE detectors, the latter specially built for triggering on cosmic muons, ALICE is now making extensive use of the trigger provided by the Time Of Flight array. The high granularity and the low noise (0.1 Hz/cm2) of the TOF MRPCs, combined with the large coverage (~150 m2), offers a wide range of trigger combinations. This extended cosmic run serves many purposes: to test the performance of each individual detector; to ensure their integration in the central Data Acquisition; to perform alignment and calibration; to check the reconstruction software; to fine-tune the tracking algorithms; and last but not least, to train the personnel for the long shifts ahead. More than 100 million events h...

  5. Exotica production with ALICE

    Directory of Open Access Journals (Sweden)

    Dönigus Benjamin

    2015-01-01

    Full Text Available The high collision energies reached at the LHC lead to significant production yields of light (anti-nuclei and (hyper-nuclei in proton–proton, proton–lead and, in particular, lead–lead collisions. The excellent particle identification capabilities of the ALICE apparatus, based on the specific energy loss in the Time Projection Chamber and the velocity information in the Time-Of-Flight detector, allow for the detection of these rarely produced particles. Further, the Inner Tracking System gives the possibility to separate primary nuclei from those coming from weak decay of heavier systems. One example of such a weak decay is the measurement of the (anti-hypertriton decay to 3He + π− (3H̅e̅ + π+. The aforementioned capabilities of the ALICE apparatus offer the unique opportunity to search for exotica, like the bound state of a Λ and a neutron which would decay into a deuteron and a pion, or the bound state of two Λ’s. Results on the production of stable nuclei in Pb–Pb collisions at √sNN = 2.76 TeV are presented, and compared with thermal model predictions. We further present the current status of the searches, by their upper limits on the production yields, and compare the results to thermal and coalescence model expectations.

  6. ALICE pp physics programme

    CERN Document Server

    Kraus, Ingrid

    2009-01-01

    The physics programme of the ALICE experiment at CERN-LHC comprises besides studies of high-energy heavy-ion collisions measurements of proton-proton interactions at unprecedented energies, too. This paper focuses on the global event characterisation in terms of the multiplicity distribution of charged hadrons and mean transverse momentum. These bulk observables become accessible because the detector features excellent track reconstruction, especially at low transverse momenta. The measurement of strange hadrons is of particular interest since the strange-particle phase-space was found to be suppressed beyond canonical reduction at lower center-of-mass energies and the production mechanism of soft particles is not yet fully understood. Here we benefit in particular from particle identification down to very low transverse momentum, i.e. 100 - 300 MeV/c, giving access to spectra and integrated yields of identified hadrons. Equipped with these features, ALICE will play a complementary role w.r.t. other LHC exper...

  7. Building a Class-1 Glove Box for Use with the NIFFTE TPC

    Science.gov (United States)

    Lynn, William

    2012-10-01

    The Neutron Induced Fission Fragment Tracking Experiment (NIFFTE) uses a Time Projection Chamber (TPC) to measure the neutron-induced fission cross sections of actinides with unprecedented accuracy which will aid in the development of the next generation nuclear reactors. Charged particles, including fission fragments, create a trail of electrons within a fill gas through ionization, which then drift in an electric field towards the read-out electronics. Using a MicroMegas mesh, the signal is amplified and then detected by the TPC pad plane. Due to the delicate nature of the MicroMegas mesh, precaution must be taken to prevent damage to the mesh from airborne contaminants which can cause the mesh to short. To avoid radiological contamination, a glove box was chosen for the task of handling and installing actinide targets into the TPC. To protect the TPC electronics, a decision was made to modify the existing glove box to create a Class-1 cleanroom environment. Variables such as glove type, filter, and cleaning agent were tested independently to determine maximum cleanliness, and a procedure for creating an acceptable Class-1 environment inside the glove box for the TPC was developed.

  8. Highly integrated electronics for the star TPC

    Energy Technology Data Exchange (ETDEWEB)

    Arthur, A.A.; Bieser, F.; Hearn, W.; Kleinfelder, S.; Merrick, T.; Millaud, J.; Noggle, T.; Rai, G.; Ritter, H.G.; Wieman, H. [Lawrence Berkeley Laboratory, CA (United States)

    1991-12-31

    The concept for the STAR TPC front-end electronics is presented and the progress toward the development of a fully integrated solution is described. It is the goal of the R+D program to develop the complete electronics chain for the STAR central TPC detector at RHIC. It is obvious that solutions chosen e.g. for ALEPH are not adequate for the 150000 channels that need to be instrumented for readout. It will be necessary to perform all the signal processing, digitization and multiplexing directly on the detector in order to reduce per channel cost and the amount of cabling necessary to read out the information. We follow the approach chosen by the EOS TPC project, where the readout electronics on the detector consists of an integrated preamplifier, a hybrid shaping amplifier, an integrated switched capacitor array and a highly multiplexed ADC. The STAR electronics will be further integrated so that approximately 16 channels of the preamplifier, the shaper, the analog store and the ADC will be contained in two integrated circuits located directly on the pad plane.

  9. Momentum scale in the HARP TPC

    CERN Document Server

    Catanesi, M G; Edgecock, R; Ellis, M; Soler, F J P; Gössling, C; Bunyatov, S; Krasnoperov, A; Popov, B; Serdiouk, V; Tereschenko, V; Di Capua, E; Vidal-Sitjes, G; Artamonov, A; Giani, S; Gilardoni, S; Gorbunov, P; Grant, A; Grossheim, A; Ivanchenko, V; Kayis-Topaksu, A; Panman, J; Papadopoulos, I; Chernyaev, E; Tsukerman, I; Veenhof, R; Wiebusch, C; Zucchelli, P; Blondel, A; Borghi, S; Morone, M C; Prior, G; Schroeter, R; Meurer, C; Gastaldi, Ugo; Mills, G B; Graulich, J S; Grégoire, G; Bonesini, M; Ferri, F; Kirsanov, M; Bagulya, A; Grichine, V; Polukhina, N; Palladino, V; Coney, L; Schmitz, D; Barr, G; De Santo, A; Bobisut, F; Gibin, D; Guglielmi, A; Mezzetto, M; Dumarchez, J; Dore, U; Orestano, D; Pastore, F; Tonazzo, A; Tortora, L; Booth, C; Howlett, L; Bogomilov, M; Chizhov, M; Kolev, D; Tsenov, R; Piperov, S; Temnikov, P; Apollonio, M; Chimenti, P; Giannini, G; Burguet-Castell, J; Cervera-Villanueva, A; Gómez-Cadenas, J J; Martín-Albo, J; Novella, P; Sorel, M

    2007-01-01

    Recently a claim was made that the reconstruction of the large angle tracks in the HARP TPC was affected by a momentum bias as large as 15% at 500 MeV/c transverse momentum. In the following we recall the main issues with the momentum measurement in the HARP TPC, and describe the cross-checks made to validate the momentum scale. Proton-proton elastic scattering data off the hydrogen target are used to alibrate the momentum of charged particles with a precision evaluated to be 3.5%. A full description of the time development of the dynamic distortions in the TPC during physics spills is now available together with a correction algorithm. This allows a new cross-check using an enlarged data set made by comparing positive and negative pion elasticscattering data collected with negative polarity of the solenoid magnet. These data confirm the absence of a bias in the sagitta measurement. The dE/dx versus momentum curves are revisited, and shown to provide a confirmation that the HARP momentum calibration is correc...

  10. ALICE honours two Italian suppliers

    CERN Multimedia

    2006-01-01

    From left to right: Robert Terpin (MIPOT), Pier Luigi Bellutti (ITC), Andrea Zanotti, President of ITC, Luciano Bosisio (Trieste University), Gennady Zinovjev (Kiev), Catherine Decosse (CERN), Lodovico Riccati, ALICE Collaboration Board Chair (INFN Torino), Paolo Giubellino (INFN Torino), Mario Zen, Director of ITC, Maurizio Boscardin (ITC), Paolo Tonella (ITC), Jurgen Schukraft, ALICE Spokesperson (CERN), Giacomo Vito Margagliotti (Trieste University), Nevio Grion (INFN Trieste), Marco Bregant (INFN Trieste) Front row from left to right: Paolo Traverso (ITC), Federico Carminati, ALICE Computing Project Leader (CERN), and Jean-Robert Lutz, ITS-SSD Project leader (IPHC Strasbourg).

  11. CERN Open Days 2013, Point 2 - ALICE: ALICE Experiment

    CERN Multimedia

    CERN Photolab

    2013-01-01

    Stand description: Visitors will be guided through the ALICE experiment, an extraordinary particle physics detector located at a depth of 80 meters below ground.  ALICE started up in 2008 to study the quark-gluon plasma, a state of matter that probably existed in the first moments of the universe. Visitors will also be able to walk inside the LHC tunnel, where superconducting magnets guide the beams of protons at unprecedented energies around the LHC. In addition to the underground visit, several ALICE physicists and engineers will be available to answer visitors' questions. On surface no restricted access  Above ground, scientific  and other kinds of shows will entertain the visitors to ALICE, even the youngest, throughout the day.

  12. Operational Experience with the ALICE Pixel detector

    CERN Document Server

    Mastroserio, A.

    2017-01-01

    The Silicon Pixel Detector (SPD) constitutes the two innermost layers of the Inner Tracking System of the ALICE experiment and it is the closest detector to the interaction point. As a vertex detector, it has the unique feature of generating a trigger signal that contributes to the L0 trigger of the ALICE experiment. The SPD started collecting data since the very first pp collisions at LHC in 2009 and since then it has taken part in all pp, Pb-Pb and p-Pb data taking campaigns. This contribution will present the main features of the SPD, the detector performance and the operational experience, including calibration and optimization activities from Run 1 to Run 2.

  13. ALICE Particle Identification

    CERN Document Server

    Hussein Ezzelarab, Nada

    2014-01-01

    During my stay at CERN, I have attended lectures mornings and worked on my research project under orienting guidance of my supervisors afternoons. The lectures were informative and pedagog- ically well-prepared and presented. Their contents was an excellent combination of theoretical and experimental topics in high-energy physics. Furthermore, I was privileged to visit the ALICE, CMS and LHCb detectors and the LINIAC accelerator. I have participated in workshop on ”MadGraph software”. I was furnished with excellent experiences and cultural exchanges with good colleagues from different countries. I got opportunities to know what the other students have done, in which projects they were involved and how they performed their scientific researches, especially regarding LHC data analysis. For my own project, I have to prove excellent experience with C++ and of course LINUX, ROOT and AliROOT. Tools such as Histograms, Graphs, Fitting, trees and many others were very essential. Furthermore, I am very proud getti...

  14. Latest results from ALICE

    CERN Document Server

    Scapparone, Eugenio

    2011-01-01

    In this paper selected results obtained by the ALICE experiment at the LHC will be presented. Data collected during the pp runs taken at sqrt(s)=0.9, 2.76 and 7 TeV and Pb-Pb runs at sqrt(s_NN)=2.76 TeV allowed interesting studies on the properties of the hadronic and nuclear matter: proton runs gave us the possibility to explore the ordinary matter at very high energy and up to very low pt, while Pb-Pb runs provided spectacular events where several thousands of particles produced in the interaction revealed how a very dense medium behaves, providing a deeper picture on the quark gluon plasma(QGP) chemical composition and dynamics.

  15. ALICE EMCal Physics Performance Report

    CERN Document Server

    Abeysekara, U.; Aronsson, T.; Awes, T.; Badala, A.; Baumgart, S.; Bellwied, R.; Benhabib, L.; Bernard, C.; Bianchi, N.; Blanco, F.; Bortoli, Y.; Boswell, B.; Bourdaud, G.; Bourrion, O.; Boyer, B.; Brown, C.R.; Bruna, E.; Butterworth, J.; Caines, H.; Calvo Diaz Aldagalan, D.; Capitani, G.P.; Carcagno, Y.; Casanova Diaz, A.; Cherney, M.; Conesa Balbastre, G.; Cormier, T.M.; Cosentino, M.R.; Cunqueiro Mendez, L.; Delagrange, H.; Del Franco, M.; Dialinas, M.; Di Nezza, P.; Donoghue, A.; Elnimr, M.; Enokizono, A.; Estienne, M.; Faivre, J.; Fantoni, A.; Fenton-Olsen, B.; Fichera, F.; Figueredo, M.A.S.; Foglio, B.; Fresneau, S.; Fujita, J.; Furget, C.; Gadrat, S.; Garishvili, I.; Germain, M.; Giudice, N.; Gorbunov, Y.N.; Grimaldi, A.; Guernane, R.; Hadjidakis, C.; Hamblen, J.; Harris, J.W.; Hasch, D.; Heinz, M.; Hicks, B.; Hille, P.T.; Hornback, D.; Ichou, R.; Jacobs, P.; Jangal, S.; Jayananda, K.; Kalliokoski, T.; Kharlov, Y.; Klay, J.L.; Knospe, A.G.; Kox, S.; Kral, J.; Laloux, P.; LaPointe, S.; La Rocca, P.; Lewis, S.; Li, Q.; Librizzi, F.; Ma, R.; Madagodahettige Don, D.; Mao, Y.; Markert, C.; Martashvili, I.; Mayes, B.; Milletto, T.; Mlynarz, J.; Muccifora, V.; Mueller, H.; Munhoz, M.G.; Muraz, J.F.; Newby, J.; Nattrass, C.; Noto, F.; Novitzky, N.; Nilsen, B.S.; Odyniec, G.; Orlandi, A.; Palmeri, A.; Pappalardo, G.S.; Pavlinov, A.; Pesci, W.; Petrov, V.; Petta, C.; Pichot, P.; Pinsky, L.; Ploskon, M.; Pompei, F.; Pulvirenti, A.; Putschke, J.; Pruneau, C.A.; Rak, J.; Rasson, J.; Read, K.F.; Real, J.S.; Reolon, A.R.; Riggi, F.; Riso, J.; Ronchetti, F.; Roy, C.; Roy, D.; Salemi, M.; Salur, S.; Sano, M.; Scharenberg, R.P.; Sharma, M.; Silvermyr, D.; Smirnov, N.; Soltz, R.; Sorensen, S.; Sparti, V.; Srivastava, B.K.; Stutzmann, J.S.; Symons, J.; Tarazona Martinez, A.; Tarini, L.; Thomen, R.; Timmins, A.; Turvey, A.; van Leeuwen, M.; Vieira, R.; Viticchie, A.; Voloshin, S.; Vernet, R.; Wang, D.; Wang, Y.; Ward, R.M.

    2010-01-01

    The ALICE detector at the LHC (A Large Ion Collider Experiment) will carry out comprehensive measurements of high energy nucleus-nucleus collisions, in order to study QCD matter under extreme conditions and the phase transtion between confined matter and the Quark-Gluon Plasma (QGP). This report presents our current state of understanding of the Physics Performance of the large acceptance Electromagnetic Calorimeter (EMCal) in the ALICE central detector. The EMCal enhances ALICE’s capabilities for jet measurements. The EMCal enables triggering and full reconstruction of high energy jets in ALICE, and augments existing ALICE capabilities to measure high momentum photons and electrons. Combined with ALICE’s excellent capabilities to track and identify particles from very low pT to high pT , the EMCal enables a comprehensive study of jet interactions in the medium produced in heavy ion collisions at the LHC.

  16. First Physics Results from ALICE

    Energy Technology Data Exchange (ETDEWEB)

    Peressounko, Dmitri [Russian Research Centre - RRC ' Kurchatov Institute' , Kurchatov sq.1, Moscow, 123182 (Russian Federation); Castillo Castellanos, Javier [service de physique nucleaire - SPhN, IRFU, CEA-Saclay, 91191 Gif-sur-Yvette Cedex (France); Belikov, Iouri [Institut Pluridisciplinaire Hubert Curien - IPHC, 23 rue du loess - BP28, 67037 Strasbourg cedex 2 (France)

    2010-07-01

    ALICE is the LHC experiment dedicated to the study of heavy-ion collisions. The main purpose of ALICE is to investigate the properties of a state of deconfined nuclear matter, the Quark Gluon Plasma. Heavy flavour measurements will play a crucial role in this investigation. The physics programme of ALICE has started by studying proton-proton collisions at unprecedented high energies. We will present the first results on open heavy flavour and quarkonia in proton-proton collisions at {radical}s = 7 TeV measured by the ALICE experiment at both mid- and forward-rapidities. We will conclude with the prospects for heavy flavour and quarkonium measurements in both proton-proton and nucleus-nucleus collisions. Also presented are first results of neutral meson reconstruction and its perspectives, as well as further physics studies. (author)

  17. That’s a matter for ALICE!

    CERN Multimedia

    Katarina Anthony

    2010-01-01

    ALICE has launched a new online newsletter to report on developments at the detector: ALICE Matters. The fortnightly newsletter will keep members of the collaboration – and a wider readership – up-to-date with the latest news from the detector.   Screenshot of the ALICE Matters website. The new ALICE Matters newsletter highlights the work of ALICE collaborators through news, interviews and feature articles. Published online every fortnight, it will report the latest developments from the experiment, providing information about operation and data taking, installation work during technical stops, and news from ALICE members. The newsletter is aimed at members of the collaboration, but as an online publication it is also open to the general public. “We often receive questions from people who follow our progress and are interested in what's happening at ALICE,” explains Despina Hatzifotiadou, ALICE Outreach Coordinator. “With ALICE Matters, we can n...

  18. ALICE @ LHC: Status and Highlights

    Science.gov (United States)

    Toia, Alberica

    2016-11-01

    ALICE is the dedicated heavy-ion experiment at the Large Hadron Collider at CERN. After a two-year long shutdown, the LHC restarted its physics programme in June 2015 with proton-proton collisions at √s = 13 TeV and Pb-Pb collisions at √sNN = 5.02 TeV, the highest centre-of-mass energy ever reached in laboratory. Recent results and future perspective for ALICE will be presented.

  19. ALICE A Large Ion Collider Experiment

    CERN Multimedia

    Hristov, P Z; Caffarri, D; Mager, M; Rohr, D M; Kucera, V; Miskowiec, D C; Selyuzhenkov, I; Mercado-perez, J; Lohner, D; Bertelsen, H; Kox, S; Cheynis, B; Hamar, G; Choudhury, S; Sambyal, S S; Agnello, M; Miake, Y; Inaba, M; Maldonado cervantes, I A; Fernandez tellez, A; Kulibaba, V; Zinovjev, G; Martynov, Y; Usenko, E; Pshenichnov, I; Nikolaev, S; Vasiliev, A; Vinogradov, A; Moukhanova, T; Vasilyev, A; Kozlov, Y; Voloshin, K; Kiselev, S; Kirilko, Y; Lyublev, E; Kondratyeva, N; Gameiro munhoz, M; Alarcon do passo suaide, A; Lagana fernandes, C; Carlin filho, N; Yin, Z; Zhu, J; Luo, J; Pikna, M; Bombara, M; Pastircak, B; Donigus, B; Rascanu, B T; Scott, H; Hanratty, L D; Marangio, G; Gianotti, P; Muccifora, V; Morando, M; Bartke, J G; Sputowska, I A; Ilkiv, I; Christiansen, P; Dodokhov, V; Yurevich, V; Fedunov, A; Malakhov, A; Efremov, A; Feofilov, G; Vinogradov, L; Asryan, A; Kovalenko, V; Piyarathna, D; Myers, C J; Martashvili, I; Scott, R M; Oh, H; Cherney, M G; Malagalage, K J; D'erasmo, G; Wagner, V; Smakal, R; Lopez, X B; Sartorelli, G; Mlynarz, J; Garishvili, I; Murray, C J; Oh, S; Srivastava, B K; Becker, B; Usai, G; Razazi, V; Zbroszczyk, H P; Feldkamp, L; Pappalardo, G; Khlebnikov, A; Basmanov, V; Punin, V; Demanov, V; Gotovac, S; Irfan, M; Felea, D; Zgura, S I; Yang, H; Vernet, R; Son, C; Shtejer diaz, K; Hwang, S; Alfaro molina, J R; Jahnke, C; Richter, M R; Garcia-solis, E J; Hitchcock, T M; Utrobicic, A; Brun, R; Divia, R; Schukraft, J; Riedler, P; Floris, M; Eulisse, G; Von haller, B; Haake, R; Kushpil, V; Ivanov, M; Malzacher, P; Schweda, K O; Reygers, K J; Pachmayer, Y C; Gaardhoeje, J J; Bearden, I G; Borel, H; Pereira da costa, H D A; Faivre, J; Germain, M; Schutz, Y R; Delagrange, H; Batigne, G; Stocco, D; Estienne, M D; Bergognon, A A E; Zoccarato, Y D; Levai, P; Bencedi, G; Mahapatra, D P; Ghosh, P; Das, T K; Mazzoni, A M; Alessandro, B; Cerello, P; De marco, N; Paic, G; Ovchynnyk, V; Karavicheva, T; Kucheryaeva, M; Skuratovskiy, O; Mal kevich, D; Bogdanov, A; Pereira, L G; Cai, X; Zhu, X; Wang, M; Zhou, F; Fan, F; Sitar, B; Cerny, V; Renfordt, R A E; Gonzalez zamora, P; Loo, K K; Jones, P G; Bianchi, N; Dainese, A; Giubilato, P; Festanti, A; Torii, H; Hori, Y; Tsuji, T; Herrera corral, G A; Kowalski, M; Rybicki, A; Kielbowicz, M M; Deloff, A; Petrovici, A; Nomokonov, P; Parfenov, A; Koshurnikov, E; Shahaliyev, E; Rogochaya, E; Kondratev, V; Oreshkina, N; Tarasov, A; Norenberg, M; Bodnya, E; Bogolyubskiy, M; Symons, T; Blanco, F; Madagodahettige don, D M; Umaka, E N; Rana, D B; Schaefer, B; De pasquale, S; Fusco girard, M; Song, M; Kim, T; Jeon, H; Porteboeuf, S J; Nandi, B K; Sarkar - sinha, T; Aggarwal, M M; Arcelli, S; Scapparone, E; Shevel, A; Nikulin, V; Komkov, B; Voloshin, S; Hille, P T; Kannan, S; Cicalo, C; De falco, A; Graczykowski, L K; Matynia, R M; Zimmermann, M B; Vinogradov, Y; Vikhlyantsev, O; Telnov, A; Tumkin, A; Khan, M M; Erdal, H A; Keidel, R; Rui, R; Yeo, I; Vilakazi, Z; Klay, J L; Boswell, B D; Lindenstruth, V; Tveter, T S; Batzing, P C; Goel, A; Breitner, T G; Sahoo, R; Roy, A; Musa, L; Perini, D; Vande vyvre, P; Fuchs, U; Aglieri rinella, G; Salgueiro domingues da silva, R M; Kalweit, A P; Greco, V; Francescon, A; Bond, P M; Marin, A M; Glassel, P; Schicker, R M; Staley, F M; Castillo castellanos, J E; Furget, C; Real, J; Martino, J F; Cheshkov, C V; Sahu, P K; Sahu, S K; Baral, R C; Singaraju, R N; Ahammed, Z; Saini, J; Basu, S; Bala, R; Gupta, R; Di bari, D; Bruno, G E; Biasotto, M; Esumi, S; Sano, M; Roehrich, D; Lonne, P; Drakin, Y; Manko, V; Nikulin, S; Yushmanov, I; Kozlov, K; Kerbikov, B; Stavinskiy, A; Sultanov, R; Raniwala, R; Zhu, H; Meres, M; Kralik, I; Evans, D; Tudor jones, G; Kinson, J; Rizzi, V; Orlandi, A; Fabris, D; Viesti, G; Lea, R; Kuijer, P G; Figiel, J; Gorlich, L M; Shabratova, G; Lobanov, V; Zaporozhets, S; Pocheptsov, T; Ivanov, A; Iglovikov, V; Ochirov, A; Petrov, V; Garner, R M; Jacobs, P M; De gruttola, D; Corsi, F; Varma, R; Koyithatta meethaleveedu, G; Kumar, J; Parmar, S; Nania, R; Zalite, A; Samsonov, V; Pruneau, C A; Caines, H L; Aronsson, T; Adare, A M; Zwick, S M; Fearick, R W; Ostrowski, P K; Kulasinski, K; Heine, N; Wilk, A; Ilkaev, R; Ilkaeva, L; Pavlov, V; Mikhaylyukov, K; Rybin, A; Naumov, N; Mudnic, E; Cortese, P; Listratenko, O; Stan, I; Nooren, G; Song, J; Krawutschke, T; Kim, S Y; Hwang, D S; Lee, S H; Leon monzon, I; Vorobyev, I; Wikne, J; Dordic, O; Yan, Y; Mazumder, R; Palmeri, A; La rocca, P; Pajares vales, C; Shahoyan, R; Kluge, A; Safarik, K; Tauro, A; Lakomov, I; Van hoorne, J W; Foka, P; Frankenfeld, U M; Masciocchi, S; Schwarz, K E; Anguelov, V; Hansen, A; Baldisseri, A; Aphecetche, L B; Berenyi, D; Sahoo, S; Nayak, T K; Muhuri, S; Patra, R N; Adhya, S P; Potukuchi, B; Saavedra san martin, O; Arnaldi, R; Scomparin, E; Beole, S; Mizuno, S; Enyo, H; Cuautle flores, E; Djuvsland, O; Altinpinar, S; Wagner, B; Fehlker, D; Velure, A; Potin, S; Zynovyev, M; Kurepin, A; Belyaev, S; Ryabinkin, E; Kiselev, I; Pestov, Y; Hayrapetyan, A; Manukyan, N; Lutz, J; Belikov, I; Roy, C S; Takahashi, J; Araujo silva figueredo, M; Tang, S; Szarka, I; Kapusta, S; Hasko, J; Putis, M; Sandor, L; Vrlakova, J; Antonczyk, D W; Bailhache, R M; Ladron de guevara, P; Acero fernandez, A; Diaz corchero, M A; Platt, R J; Kour, R; Scott, P A; Das, S; Turrisi, R; Hayashi, S; Van rijn, A J; Siemiarczuk, T; Petrovici, M; Petris, M; Stenlund, E A; Malinina, L; Fateev, O; Kolozhvari, A; Altsybeev, I; Sadovskiy, S; Soloviev, A; Markert, C; Ploskon, M A; Mayes, B W; Sorensen, S P; Awes, T; Virgili, T; Pagano, P; Kim, B; Krus, M; Vulpescu, B; Sett, P; Bhatt, H; Sinha, B; Khan, P; Antonioli, P; Scioli, G; Sakaguchi, H; Volkov, S; Ivanov, V; Khanzadeev, A; Malaev, M; Lisa, M A; Salzwedel, J S N; Loggins, V R; Schuster, T R; Hicks, B R; Scharenberg, R P; Masoni, A; Incani, E; Debski, P R; Oleniacz, J; Westerhoff, U; Wilde, M R; Yanovskiy, V; Domrachev, S; Smirnova, Y; Zimmermann, S; Ahmad, N; Shestakov, V; Veldhoen, M; Van der maarel, J; Kileng, B; Seo, J; Lopez torres, E; Ceballos sanchez, C; Camerini, P; Jang, H J; Buthelezi, E Z; Steyn, G F; Suleymanov, M K O; Belmont moreno, E; Skaali, B; Milosevic, J; Zhao, C; Perales, M; Kobdaj, C; Mishra, A N; Roukoutakis, F; Gonzalez ferreiro, E; Keil, M; Morsch, A; Rademakers, A; Soos, C; Zampolli, C; Grigoras, C; Chibante barroso, V M; Schuchmann, S; Grigoras, A G; Berzano, D; Lafuente mazuecos, A; Wegrzynek, A T; Bielcikova, J; Kushpil, S; Braun-munzinger, P; Andronic, A; Zimmermann, A; Wilkinson, J J; Arbor, N; Erazmus, B E; Pichot, P; Pillot, P; Grossiord, J; Boldizsar, L; Costanza, S; Gallio, M; Masera, M; Simonetti, L; Prino, F; Oppedisano, C; Toscano, L; Nappi, G; Botta, E; Vargas trevino, A D; Nystrand, J I; Ullaland, K; Haaland, O S; Huang, M; Naumov, S; Trubnikov, V; Alkin, A; Ivanytskyi, O; Guber, F; Karavichev, O; Nyanin, A; Sibiryak, Y; Peresunko, D Y; Patarakin, O; Aleksandrov, D; Blau, D; Yasnopolskiy, S; Chumakov, M; Vetlitskiy, I; Nedosekin, A; Selivanov, A; Okorokov, V; Grigoryan, A; Papikyan, V; Kuhn, C C; Wan, R; Zhou, D; Cajko, F; Siska, M; Mares, J; Zavada, P; Pitz, N; Rubio montero, A J; Reolon, A R; Antinori, F; Gunji, T; Snellings, R; Mayer, C; Matyja, A T; Klusek-gawenda, M J; Schiaua, C C; Andrei, C; Herghelegiu, A I; Soegaard, C; Panebrattsev, Y; Penev, V; Efimov, L; Zanevskiy, Y; Vechernin, V; Zarochentsev, A; Kolevatov, R; Agapov, A; Polishchuk, B; Loizides, C; Anwar, R; Anticic, T; Kwon, Y; Kim, M; Moon, T; Petran, M; Rosnet, P; Ramillien barret, V; Sahoo, B; Das bose, L; Hushnud, H; Hatzifotiadou, D; Shigaki, K; Jha, D M; Soltz, R A; Murray, S; Mastroserio, A; Puddu, G; Serci, S; Siddi, E; Siddhanta, S; Badala, A; Putevskoy, S; Shapovalova, E; Ahmad, A; Haiduc, M; Mitu, C M; Mischke, A; Grelli, A; Hetland, K F; Rachevski, A; Menchaca-rocha, A A; De cuveland, J; Hutter, D; Langhammer, M; Dahms, T; Watkins, E P; Kumar, L; Petta, C; Gago medina, A M; Planinic, M; Riegler, W; Telesca, A; Lazaridis, L; Ferencei, J; Martin, N A; Windelband, B S; Nielsen, B S; Chojnacki, M; Espagnon, B; Uras, A; Lemmon, R C; Agocs, A G; Viyogi, Y; Pal, S K; Singhal, V; Khan, S A; Alam, S N; Bagnasco, S; Rodriguez cahuantzi, M; Maslov, M; Kurepin, A; Ippolitov, M; Lebedev, V; Tsvetkov, A; Klimov, A; Agafonov, G; Martemiyanov, A; Loginov, V; Kononov, S; Grigoryan, S; Jangal, S G; Hnatic, M; Kalinak, P; Appelshaeuser, H; Ulery, J G; Luettig, P J; Heckel, S T; Trzaska, W H; Kral, J; Lietava, R; Matthews, Z L; Palaha, A S; Raha, S; Calero diaz, L; Segato, G; Canoa roman, V; Cruz albino, R; Botje, M; Gladysz-dziadus, E; Marszal, T; Dobrowolski, T A; Oskarsson, A N E; Otterlund, I; Tydesjo, H; Ljunggren, H M; Vodopyanov, A; Akichine, P; Kuznetsov, A; Vedeneyev, V; Naumenko, P; Bilov, N; Rogalev, R; Evdokimov, S; Braidot, E; Bellwied, R; De caro, A; Kang, J H; Gorbunov, Y; Lee, J; Pachr, M; Baldit, A; Manso, F; Crochet, P; Batista camejo, A; Dash, S; Roy, P K; Cifarelli, L; Laurenti, G; Margotti, A; Bellini, F; Sugitate, T; Zhalov, M; Pavlinov, A; Harris, J W; Caballero orduna, D; Pluta, J M; Kisiel, A R; Wrobel, D; Klein-boesing, C; Zhitnik, A; Nazarenko, S; Zavyalov, N; Miroshnikov, D; Kuryakin, A; Vyushin, A; Mamonov, A; Vickovic, L; Niculescu, M; De rooij, R S; Fragiacomo, E; Ahn, S U; Ahn, S; Foertsch, S V; Brown, C R; Munzer, R H; Lovhoiden, G; Harton, A V; Khosonthongkee, K; Schmidt, H R; Barbera, R; Giudice, N; Grimaldi, A; Betev, L; Buncic, P; Carena, F; Di mauro, A; Martinengo, P; Gargiulo, C; Grosse-oetringhaus, J F; Costa, F; Baltasar dos santos pedrosa, F; Laudi, E; Adamova, D; Lippmann, C; Schmidt, C J; Grajcarek, R; Volkl, M A; Christensen, C H; Rakotozafindrabe, A M; Conesa balbastre, G; Martinez-garcia, G; Suire, C P; Ducroux, L; Tieulent, R N; Barnafoldi, G G; Pochybova, S; Dubey, A K; Acharya, S; Gupta, A; Ricci, R A; Meddi, F; Vercellin, E; Chujo, T; Watanabe, K; Onishi, H; Akiba, Y; Vergara limon, S; Tejeda munoz, G; Skjerdal, K; Svistunov, S; Reshetin, A; Maevskaya, A; Antonenko, V; Mishustin, N; Meleshko, E; Korsheninnikov, A; Balygin, K; Zagreev, B; Akindinov, A; Mikhaylov, K; Gushchin, O; Grigoryev, V; Gulkanyan, H; Sanchez castro, X; Peretti pezzi, R; Oliveira da silva, A C; Harmanova, Z; Vokal, S; Beitlerova, A; Kramer, F; Book, J H; Montes prado, E; Rak, J; Jusko, A; Ghosh, S K; Spiriti, E; Ronchetti, F; Casanova diaz, A O; Lunardon, M; Aiftimiei, C; Kuzmin, N; Melkumov, G; Zinchenko, A; Shklovskaya, A; Bunzarov, Z I; Chernenko, S; Toulina, T; Kompaniets, M; Titov, A; Kharlov, Y; Dantsevich, G; Stolpovskiy, M; Porter, R J; Datskova, O V; Nattrass, C; Mazer, J A; Seger, J E; Kim, J; Kim, D S; Jung, W W; Kim, H; Bielcik, J; Pospisil, V; Cepila, J; Dupieux, P; Bastid, N; Das, D; Bhati, A K; Williams, C; Pesci, A; Roshchin, E; Humanic, T; Steinpreis, M D; Yaldo, C G; Abelev, B B; Smirnov, N; Heinz, M T; Connors, M E; Barile, F; Fiore, E M; Orzan, G; Wielanek, D H; Servais, E L J; Patecki, M; Passfeld, A; Zhelezov, S; Morkin, A; Zabelin, O; Hussain, T; Ramello, L; Rogachevskiy, O; Van leeuwen, M; Van den brink, A; Bertens, R A; Lodato, D F; Haque, M R; Kim, E J; Coccetti, F; Margagliotti, G V; Rauf, A W; Sandoval, A; Berger, M E; Qvigstad, H; Lindal, S; Cervantes jr, M; Kebschull, U W; Engel, H; Karasu uysal, A; Hess, B A; Calvo villar, E; Augustinus, A; Carena, W; Chochula, P; Chapeland, S; Dobrin, A F; Reidt, F; Bock, F; Galdames perez, A; Sumbera, M; Averbeck, R P; Garabatos cuadrado, J; Stachel, J; Wang, Y; Boggild, H; Gulbrandsen, K H; Hansen, J C; Charvet, J F; Shabetai, A; Hadjidakis, C M; Vertesi, R; Mitra, J; Altini, V; Riccati, L; Ferretti, A; Gagliardi, M; Bufalino, S; Sakata, D; Niida, T; Martinez hernandez, M I; Yang, S; Langoy, R; Karpechev, E; Veselovskiy, A; Konevskikh, A; Finogeev, D; Fokin, S; Karadzhev, K; Kucheryaev, Y; Plotnikov, V; Ryabinin, M; Golubev, A; Kaplin, V; Ter-minasyan, A; Abramyan, A; Raniwala, S; Hippolyte, B; Zhang, H; Strmen, P; Krivan, F; Reichelt, P S; Marquard, M; Broker, T A; Zyzak, M; Kulakov, I; Sahlmuller, B; Kalliokoski, T E A; Chang, B; Krivda, M; De cataldo, G; Paticchio, V; Fantoni, A; Soramel, F; Scarlassara, F; Bombonati, C; Gomez jimenez, R; Christakoglou, P; Cyz, A; Wilk, G A; Kurashvili, P; Pop, A; Arefiev, V; Batyunya, B; Kadyshevskiy, V; Lioubochits, V; Zryuev, V; Sokolov, M; Patalakha, D; Xaplanteris karampatsos, L; Grounds, A; Pinsky, L; Timmins, A R; Petracek, V; Krelina, M; Chattopadhyay, S; Basile, M; Falchieri, D; Miftakhov, N; Konyushikhin, M; Joseph, N; Cleymans, J W A; Dietel, T; Pawlak, T J; Kucinski, M; Janik, M A; Surma, K D; Niedziela, J; Wessels, J P; Riggi, F; Ivanov, A; Selin, I; Budnikov, D; Filchagin, S; Sitta, M; Gheata, M; Danu, A; Diomkin, V; Peitzmann, T; Reicher, M; Helstrup, H; Subasi, M; Mathis, A M; Nilsson, M S; Banerjee, S S; Goyal, D; Rist, J A S; Jena, C; Lara martinez, C E; Vasileiou, M; Spyropoulou-stassinaki, M; Simatovic, G

    2002-01-01

    %title\\\\ \\\\ALICE is a general-purpose heavy-ion detector designed to study the physics of strongly interacting matter and the quark-gluon plasma in nucleus-nucleus collisions at the LHC. It currently includes more than 750~physicists and $\\sim$70 institutions in 27 countries.\\\\ \\\\The detector is designed to cope with the highest particle multiplicities anticipated for Pb-Pb reactions (dN/dy~$\\approx$~8000) and it will be operational at the start-up of the LHC. In addition to heavy systems, the ALICE Collaboration will study collisions of lower-mass ions, which are a means of varying the energy density, and protons (both pp and p-nucleus), which provide reference data for the nucleus-nucleus collisions.\\\\ \\\\ALICE consists of a central part, which measures event-by-event hadrons, electrons and photons, and a forward spectrometer to measure muons. The central part, which covers polar angles from 45$^{0} $ to 135$^{0} $ ($\\mid \\eta \\mid $ < 0.9) over the full azimuth, is embedded in the large L3 solenoidal mag...

  20. ALICE rewards one of its suppliers

    CERN Multimedia

    2007-01-01

    On 6 October 2007 the ALICE Collaboration Board awarded one of its prestigious Industrial Awards to Hewlett-Packard for its instrumental role in enabling ALICE physicists to collect and process experimental data on the Grid. From left to right: Jurgen Schukraft, ALICE Spokesperson; Michel Bénard, Hewlett Packard, Director, Technology Programs and University Relations; Federico Carminati, ALICE Computing Project Leader; Lodovico Riccati, ALICE Collaboration Board Chairperson; Arnaud Pierson, Hewlett Packard, E.M.E.A Program Manager, University Relations and HP Labs; Latchezar Betev, ALICE Distributed Computing Coordinator.The ALICE DAQ and Offline groups have been collaborating with HP since 1993 in the yearly Computing and GRID physics data challenges programme. These are high-level exercises of readiness of hardware and software frameworks for data acquisition and processing. HP hosted ALICE experts in their "centre de compétences"...

  1. Team Primacy Concept (TPC) Based Employee Evaluation and Job Performance

    Science.gov (United States)

    Muniute, Eivina I.; Alfred, Mary V.

    2007-01-01

    This qualitative study explored how employees learn from Team Primacy Concept (TPC) based employee evaluation and how they use the feedback in performing their jobs. TPC based evaluation is a form of multirater evaluation, during which the employee's performance is discussed by one's peers in a face-to-face team setting. The study used Kolb's…

  2. The ALICE time machine

    Directory of Open Access Journals (Sweden)

    Ferretti Alessandro

    2013-09-01

    Full Text Available According to the Big Bang theory, the Universe was once in an extremely hot and dense state which expanded rapidly. In such a state the normal nuclear matter could not exist: it is believed that a few microsecond after big-bang the matter underwent a phase transition, from a state called Quark-Gluon Plasma (QGP to a hadron gas. Some of the unexplained features of the Universe could be explained by the QGP properties. One of the aims of the CERN LHC is to recreate (on a smaller scale a QGP state, compressing and heating ordinary nuclear matter by means of ultrarelativistic heavy-ion collisions. The ALICE experiment at CERN is dedicated to the study of the medium produced in these collisions : in particular, the study of the heavy quarkonia suppression pattern can give a measure of the temperature reached in these collisions, helping us to understand how close we are getting to the conditions of the starting point of the Universe.

  3. Alice in Danceland

    Directory of Open Access Journals (Sweden)

    Fabio Ciambella

    2012-12-01

    Full Text Available Lo scopo di questo saggio è quello di presentare un ‘case study’ finora inesplorato nel campo degli studi sugli adattamenti: la danza in Alice’s Adventures in Wonderland (1865 di Lewis Carroll e le sue trasformazioni in sede di transmodalizzazione. In particolar modo si prenderanno in esame i due adattamenti cinematografici più celebri del romanzo dello scrittore vittoriano: il cartone animato prodotto dalla Disney nel 1951 e il film del 2010 diretto dal regista californiano Tim Burton. Se in Alice’s Adventures in Wonderland di Carroll la danza è quella delle aragoste del capitolo (il decimo per l'esattezza che si intitola proprio “The Lobster Quadrille”, nel capolavoro Disney non vi è traccia alcuna né di aragoste, né tanto meno di tartarughe o grifoni. Eppure paradossalmente la danza nel cartone animato è un motivo ricorrente, che fa da sfondo alle peripezie della protagonista dall'inizio alla fine dell'opera. Quel che stupisce ancora di più lo spettatore di Alice di Burton è la presenza della danza in due precisi momenti della pellicola – all'inizio e alla fine – che non sono presenti né nell’ipotesto, né nell'adattamento Disney. In altre parole, sebbene la danza sia presente nelle tre opere, essa non compare mai nello stesso momento o con le stesse modalità.

  4. ALICE tests its digital chain

    CERN Multimedia

    2007-01-01

    During its 7th data challenge, ALICE successfully tested the infrastructure of its data acquisition, transfer and storage system. The ALICE experiment will need a rock-solid data acquisition, selection, transfer, storage and handling system to analyse the billions of bits of data that will be generated every second. The heavy ion collisions at the LHC will generate 10 times more data per second than proton collisions. The ALICE teams have therefore been hard at it for several years designing a cutting-edge informatics system, whose reliability is regularly put to the test in the annual data challenges. Last December, groups from the Collaboration and the IT Department joined forces, or rather cables, in the 7th of these challenges. The teams of ALICE DAQ (data acquisition), ALICE Offline (data handling), IT-CS-IO (network) and IT-FIO (CASTOR and data storage) all took part in testing the various components of the infrastructure, from data acquisition to transfer and storage. Working in close collaboration,...

  5. PC adapter and patch panel for ALICE

    CERN Multimedia

    Patrice Loïez

    2003-01-01

    These components form part of the ALICE detector data link (DDL). This is a high-speed optical link designed to interface the readout electronics of ALICE detectors to computers for data acquisition. A total of 400 DDLs will be installed on ALICE. These silicon devices have been developed especially for use in the high radiation levels produced in detector environments.

  6. Industrial collaborators honoured by ALICE

    CERN Multimedia

    Maximilien Brice

    2004-01-01

    Picture 01 : the winners gather after the ALICE Award ceremony (from left to right): Yuri Saveliev, Stanislav Burachas and Sergei Beloglovsky of North Crystals; Maximilian Metzger, CERN's secretary-general; Rang Cai of ATM; Jürgen Schukraft, ALICE spokesperson; Erich Pamminger and Daniel Gattinger of FACC; and Tiejun Wang of ATM. The ALICE collaboration has presented its second round of awards to three companies for their novel and remarkable contributions to major detector systems: Advance Technology and Materials (ATM), Fischer Advanced Composite Components (FACC) and North Crystals. The awards presented to these three leaders in advanced, modern materials were beautifully sculpted from one of the oldest materials used by mankind to manufacture tools - Mexican Obsidian

  7. Managing Information Flow in ALICE

    CERN Document Server

    Augustinus, A; Moreno, A; Kurepin, A N; De Cataldo, G; Pinazza, O; Rosinský, P; Lechman, M; Jirdén, L S

    2011-01-01

    ALICE is one of the experiments at the Large Hadron Collider (LHC) at CERN in Geneva, Switzerland. The ALICE detector control system is an integrated system collecting 18 different detectors’ controls and general services. Is implemented using the commercial SCADA package PVSS. Information of general interest, such as beam and condition data, and data related to shared plants or systems, are made available to all the subsystems via the distribution capabilities of PVSS. Great care has been taken to build a modular and hierarchical system, limiting the interdependencies of the various subsystems. Accessing remote resources in a PVSS distributed environment is very simple and can be initiated unilaterally. In order to improve the reliability of distributed data and to avoid unforeseen and unwished dependencies, the ALICE DCS group has enforced the centralization of global data required by the subsystems. A tool has been developed to monitor the level of interdependency and to understand the ...

  8. Signal Processing in the MicroBooNE LArTPC

    CERN Document Server

    Joshi, Jyoti

    2015-01-01

    The MicroBooNE experiment is designed to observe interactions of neutrinos with a Liquid Argon Time Projection Chamber (LArTPC) detector from the on-axis Booster Neutrino Beam (BNB) and off-axis Neutrinos at the Main Injector (NuMI) beam at Fermi National Accelerator Laboratory. The detector consists of a $2.5~m\\times 2.3~m\\times 10.4~m$ TPC including an array of 32 PMTs used for triggering and timing purposes. The TPC is housed in an evacuable and foam insulated cryostat vessel. It has a 2.5 m drift length in a uniform field up to 500 V/cm. There are 3 readout wire planes (U, V and Y co-ordinates) with a 3-mm wire pitch for a total of 8,256 signal channels. The fiducial mass of the detector is 60 metric tons of LAr. In a LArTPC, ionization electrons from a charged particle track drift along the electric field lines to the detection wire planes inducing bipolar signals on the U and V (induction) planes, and a unipolar signal collected on the (collection) Y plane. The raw wire signals are processed by speciali...

  9. The ALICE High Level Trigger: status and plans

    CERN Document Server

    Krzewicki, Mikolaj; Gorbunov, Sergey; Breitner, Timo; Lehrbach, Johannes; Lindenstruth, Volker; Berzano, Dario

    2015-01-01

    The ALICE High Level Trigger (HLT) is an online reconstruction, triggering and data compression system used in the ALICE experiment at CERN. Unique among the LHC experiments, it extensively uses modern coprocessor technologies like general purpose graphic processing units (GPGPU) and field programmable gate arrays (FPGA) in the data flow. Realtime data compression is performed using a cluster finder algorithm implemented on FPGA boards. These data, instead of raw clusters, are used in the subsequent processing and storage, resulting in a compression factor of around 4. Track finding is performed using a cellular automaton and a Kalman filter algorithm on GPGPU hardware, where both CUDA and OpenCL technologies can be used interchangeably. The ALICE upgrade requires further development of online concepts to include detector calibration and stronger data compression. The current HLT farm will be used as a test bed for online calibration and both synchronous and asynchronous processing frameworks already before t...

  10. Alice Childress: A Pioneering Spirit.

    Science.gov (United States)

    Brown-Guillory, Elizabeth

    1987-01-01

    Interview with Alice Childress (born 1920), an actress, playwright, novelist, editor, and lecturer. Her "Gold through the Forest" (1952) was the first play by a Black woman to be produced professionally on the American stage. Her latest play, "Moms," was produced in New York City in 1987. (BJV)

  11. ALICE Holds Up to Challenge

    CERN Multimedia

    2006-01-01

    ALICE's main austenitic stainless steel support structure (the Space Frame) has recently gone through many tests that proved quite challenging: insuring the structure is sound and lowering it horizontally into the ALICE cavern. This structure is constructed to hold the large volume detectors, such as the Time Projection Chamber, Transition Radiation Detector and Time of Flight inside the ALICE solenoid magnet. After the final assembly at CERN, two large mobile cranes were needed for the job of lifting and turning the 14 tonne frame onto its side. Once shifted, it was placed in Building SX2, one of the surface assembly areas designated for ALICE. The structure, which is 8 m in diameter and 7 m long, underwent many tests in its new position. Geometric control tests were performed by measuring each of the 18 cells and placing wooden or metal samples constructed to the same dimensions as the real thing inside the structure. The most important check was the movement of the real Time Projection Chamber from its s...

  12. Elliptic Flow Measurement at ALICE

    NARCIS (Netherlands)

    Simili, E.L.

    2008-01-01

    In view of the upcoming ALICE experiment, a dedicated detector to study ultra-relativistic heavy ion collisions at the Large Hadron Collider (LHC) at CERN, the present thesis has been devoted to the study of Elliptic Flow, i.e. the azimuthal anisotropy in the momenta distribution of the final state

  13. Alice in the Real World

    Science.gov (United States)

    Parker, Tom

    2012-01-01

    As a fifth-grade mathematics teacher, the author tries to create authentic problem-solving activities that connect to the world in which his students live. He discovered a natural connection to his students' real world at a computer camp. A friend introduced him to Alice, a computer application developed at Carnegie Mellon, under the leadership of…

  14. ALICE Time Of Flight Detector

    CERN Multimedia

    Alici, A

    2013-01-01

    Charged particles in the intermediate momentum range are identified in ALICE by the Time Of Flight (TOF) detector. The time measurement with the TOF, in conjunction with the momentum and track length measured by the tracking detector, is used to calculate the particle mass.

  15. On the horizon for ALICE

    CERN Multimedia

    Antonella Del Rosso

    2012-01-01

    ALICE – the LHC experiment specifically designed to study the physics of the Quark Gluon Plasma (QGP) and, more generally, of strongly interacting matter at extreme energy densities – is planning a series of upgrades during the long shutdowns of the accelerator in the coming years. The new ALICE will have enhanced read-out capabilities and improved efficiency when tracking particles and identifying the vertex of the interactions.     Corrado Gargiulo, ALICE's Project Engineer with ITS prototype. The new ITS will consist of 7 layers of silicon sensors supported by a ultra-light carbon fibre structure.  The LHC has been operated with lead ions for only about two months, but this has been sufficient for ALICE and other LHC experiments to produce results that previous accelerators took several years of operation to produce. “Prior to the start-up of the LHC heavy-ion programme, the nature of the QGP as an almost-perfect liquid had already...

  16. The ALICE pixel detector upgrade

    Science.gov (United States)

    Reidt, F.

    2016-12-01

    The ALICE experiment at the CERN LHC is designed to study the physics of strongly interacting matter, and in particular the properties of the Quark-Gluon Plasma, using proton-proton, proton-nucleus and nucleus-nucleus collisions. The ALICE collaboration is preparing a major upgrade of the experimental apparatus to be installed during the second long LHC shutdown in the years 2019-2020. A key element of the ALICE upgrade is the new, ultra-light, high-resolution Inner Tracking System. With respect to the current detector, the new Inner Tracking System will significantly enhance the pointing resolution, the tracking efficiency at low transverse momenta, and the read-out rate capabilities. This will be obtained by seven concentric detector layers based on a Monolithic Active Pixel Sensor with a pixel pitch of about 30×30 μm2. A key feature of the new Inner Tracking System, which is optimised for high tracking accuracy at low transverse momenta, is the very low mass of the three innermost layers, which feature a material budget of 0.3% X0 per layer. This contribution presents the design goals and layout of the upgraded ALICE Inner Tracking System, summarises the R&D activities focussing on the technical implementation of the main detector components, and the projected detector performance.

  17. ALICE Diffractive Detector Control System for RUN-II in the ALICE Experiment

    Science.gov (United States)

    Cabanillas, J. C.; Martínez, M. I.; León, I.

    2016-10-01

    The ALICE Diffractive (AD0) detector has been installed and commissioned for the second phase of operation (RUN-II). With this new detector it is possible to achieve better measurements by expanding the range of pseudo-rapidity in which the production of particles can be detected. Specifically the selection of diffractive events in the ALICE experiment which was limited by the range over which rapidity gaps occur. Any new detector should be able to take data synchronously with all other detectors and to be operated through the ALICE central systems. One of the key elements developed for the AD0 detector is the Detector Control System (DCS). The DCS is designed to operate safely and correctly this detector. Furthermore, the DCS must also provide optimum operating conditions for the acquisition and storage of physics data and ensure these are of the highest quality. The operation of AD0 implies the configuration of about 200 parameters, as electronics settings and power supply levels and the generation of safety alerts. It also includes the automation of procedures to get the AD0 detector ready for taking data in the appropriate conditions for the different run types in ALICE. The performance of AD0 detector depends on a certain number of parameters such as the nominal voltages for each photomultiplier tube (PMT), the threshold levels to accept or reject the incoming pulses, the definition of triggers, etc. All these parameters affect the efficiency of AD0 and they have to be monitored and controlled by the AD0 DCS.

  18. The ALICE experiment at the CERN LHC

    Science.gov (United States)

    The ALICE Collaboration; Aamodt, K.; Abrahantes Quintana, A.; Achenbach, R.; Acounis, S.; Adamová, D.; Adler, C.; Aggarwal, M.; Agnese, F.; Aglieri Rinella, G.; Ahammed, Z.; Ahmad, A.; Ahmad, N.; Ahmad, S.; Akindinov, A.; Akishin, P.; Aleksandrov, D.; Alessandro, B.; Alfaro, R.; Alfarone, G.; Alici, A.; Alme, J.; Alt, T.; Altinpinar, S.; Amend, W.; Andrei, C.; Andres, Y.; Andronic, A.; Anelli, G.; Anfreville, M.; Angelov, V.; Anzo, A.; Anson, C.; Anticić, T.; Antonenko, V.; Antonczyk, D.; Antinori, F.; Antinori, S.; Antonioli, P.; Aphecetche, L.; Appelshäuser, H.; Aprodu, V.; Arba, M.; Arcelli, S.; Argentieri, A.; Armesto, N.; Arnaldi, R.; Arefiev, A.; Arsene, I.; Asryan, A.; Augustinus, A.; Awes, T. C.; Äysto, J.; Danish Azmi, M.; Bablock, S.; Badalà, A.; Badyal, S. K.; Baechler, J.; Bagnasco, S.; Bailhache, R.; Bala, R.; Baldisseri, A.; Baldit, A.; Bán, J.; Barbera, R.; Barberis, P.-L.; Barbet, J. M.; Barnäfoldi, G.; Barret, V.; Bartke, J.; Bartos, D.; Basile, M.; Basmanov, V.; Bastid, N.; Batigne, G.; Batyunya, B.; Baudot, J.; Baumann, C.; Bearden, I.; Becker, B.; Belikov, J.; Bellwied, R.; Belmont-Moreno, E.; Belogianni, A.; Belyaev, S.; Benato, A.; Beney, J. L.; Benhabib, L.; Benotto, F.; Beolé, S.; Berceanu, I.; Bercuci, A.; Berdermann, E.; Berdnikov, Y.; Bernard, C.; Berny, R.; Berst, J. D.; Bertelsen, H.; Betev, L.; Bhasin, A.; Baskar, P.; Bhati, A.; Bianchi, N.; Bielčik, J.; Bielčiková, J.; Bimbot, L.; Blanchard, G.; Blanco, F.; Blanco, F.; Blau, D.; Blume, C.; Blyth, S.; Boccioli, M.; Bogdanov, A.; Bøggild, H.; Bogolyubsky, M.; Boldizsár, L.; Bombara, M.; Bombonati, C.; Bondila, M.; Bonnet, D.; Bonvicini, V.; Borel, H.; Borotto, F.; Borshchov, V.; Bortoli, Y.; Borysov, O.; Bose, S.; Bosisio, L.; Botje, M.; Böttger, S.; Bourdaud, G.; Bourrion, O.; Bouvier, S.; Braem, A.; Braun, M.; Braun-Munzinger, P.; Bravina, L.; Bregant, M.; Bruckner, G.; Brun, R.; Bruna, E.; Brunasso, O.; Bruno, G. E.; Bucher, D.; Budilov, V.; Budnikov, D.; Buesching, H.; Buncic, P.; Burns, M.; Burachas, S.; Busch, O.; Bushop, J.; Cai, X.; Caines, H.; Calaon, F.; Caldogno, M.; Cali, I.; Camerini, P.; Campagnolo, R.; Campbell, M.; Cao, X.; Capitani, G. P.; Romeo, G. Cara; Cardenas-Montes, M.; Carduner, H.; Carena, F.; Carena, W.; Cariola, P.; Carminati, F.; Casado, J.; Casanova Diaz, A.; Caselle, M.; Castillo Castellanos, J.; Castor, J.; Catanescu, V.; Cattaruzza, E.; Cavazza, D.; Cerello, P.; Ceresa, S.; Černý, V.; Chambert, V.; Chapeland, S.; Charpy, A.; Charrier, D.; Chartoire, M.; Charvet, J. L.; Chattopadhyay, S.; Chattopadhyay, S.; Chepurnov, V.; Chernenko, S.; Cherney, M.; Cheshkov, C.; Cheynis, B.; Chochula, P.; Chiavassa, E.; Chibante Barroso, V.; Choi, J.; Christakoglou, P.; Christiansen, P.; Christensen, C.; Chykalov, O. A.; Cicalo, C.; Cifarelli-Strolin, L.; Ciobanu, M.; Cindolo, F.; Cirstoiu, C.; Clausse, O.; Cleymans, J.; Cobanoglu, O.; Coffin, J.-P.; Coli, S.; Colla, A.; Colledani, C.; Combaret, C.; Combet, M.; Comets, M.; Conesa Balbastre, G.; Conesa del Valle, Z.; Contin, G.; Contreras, J.; Cormier, T.; Corsi, F.; Cortese, P.; Costa, F.; Crescio, E.; Crochet, P.; Cuautle, E.; Cussonneau, J.; Dahlinger, M.; Dainese, A.; Dalsgaard, H. H.; Daniel, L.; Das, I.; Das, T.; Dash, A.; Da Silva, R.; Davenport, M.; Daues, H.; De Caro, A.; de Cataldo, G.; De Cuveland, J.; De Falco, A.; de Gaspari, M.; de Girolamo, P.; de Groot, J.; De Gruttola, D.; De Haas, A.; De Marco, N.; De Pasquale, S.; De Remigis, P.; de Vaux, D.; Decock, G.; Delagrange, H.; Del Franco, M.; Dellacasa, G.; Dell'Olio, C.; Dell'Olio, D.; Deloff, A.; Demanov, V.; Dénes, E.; D'Erasmo, G.; Derkach, D.; Devaux, A.; Di Bari, D.; Di Bartolomeo, A.; Di Giglio, C.; Di Liberto, S.; Di Mauro, A.; Di Nezza, P.; Dialinas, M.; Diaz, L.; Díaz Valdes, R.; Dietel, T.; Dima, R.; Ding, H.; Dinca, C.; Divià, R.; Dobretsov, V.; Dobrin, A.; Doenigus, B.; Dobrowolski, T.; Domínguez, I.; Dorn, M.; Drouet, S.; Dubey, A. E.; Ducroux, L.; Dumitrache, F.; Dumonteil, E.; Dupieux, P.; Duta, V.; Dutta Majumdar, A.; Dutta Majumdar, M.; Dyhre, Th; Efimov, L.; Efremov, A.; Elia, D.; Emschermann, D.; Engster, C.; Enokizono, A.; Espagnon, B.; Estienne, M.; Evangelista, A.; Evans, D.; Evrard, S.; Fabjan, C. W.; Fabris, D.; Faivre, J.; Falchieri, D.; Fantoni, A.; Farano, R.; Fearick, R.; Fedorov, O.; Fekete, V.; Felea, D.; Feofilov, G.; Férnandez Téllez, A.; Ferretti, A.; Fichera, F.; Filchagin, S.; Filoni, E.; Finck, C.; Fini, R.; Fiore, E. M.; Flierl, D.; Floris, M.; Fodor, Z.; Foka, Y.; Fokin, S.; Force, P.; Formenti, F.; Fragiacomo, E.; Fragkiadakis, M.; Fraissard, D.; Franco, A.; Franco, M.; Frankenfeld, U.; Fratino, U.; Fresneau, S.; Frolov, A.; Fuchs, U.; Fujita, J.; Furget, C.; Furini, M.; Fusco Girard, M.; Gaardhøje, J.-J.; Gabrielli, A.; Gadrat, S.; Gagliardi, M.; Gago, A.; Gaido, L.; Gallas Torreira, A.; Gallio, M.; Gandolfi, E.; Ganoti, P.; Ganti, M.; Garabatos, J.; Garcia Lopez, A.; Garizzo, L.; Gaudichet, L.; Gemme, R.; Germain, M.; Gheata, A.; Gheata, M.; Ghidini, B.; Ghosh, P.; Giolu, G.; Giraudo, G.; Giubellino, P.; Glasow, R.; Glässel, P.; Ferreiro, E. G.; Gonzalez Gutierrez, C.; Gonzales-Trueba, L. H.; Gorbunov, S.; Gorbunov, Y.; Gos, H.; Gosset, J.; Gotovac, S.; Gottschlag, H.; Gottschalk, D.; Grabski, V.; Grassi, T.; Gray, H.; Grebenyuk, O.; Grebieszkow, K.; Gregory, C.; Grigoras, C.; Grion, N.; Grigoriev, V.; Grigoryan, A.; Grigoryan, C.; Grigoryan, S.; Grishuk, Y.; Gros, P.; Grosse-Oetringhaus, J.; Grossiord, J.-Y.; Grosso, R.; Grynyov, B.; Guarnaccia, C.; Guber, F.; Guerin, F.; Guernane, R.; Guerzoni, M.; Guichard, A.; Guida, M.; Guilloux, G.; Gulkanyan, H.; Gulbrandsen, K.; Gunji, T.; Gupta, A.; Gupta, V.; Gustafsson, H.-A.; Gutbrod, H.; Hadjidakis, C.; Haiduc, M.; Hamar, G.; Hamagaki, H.; Hamblen, J.; Hansen, J. C.; Hardy, P.; Hatzifotiadou, D.; Harris, J. W.; Hartig, M.; Harutyunyan, A.; Hayrapetyan, A.; Hasch, D.; Hasegan, D.; Hehner, J.; Heine, N.; Heinz, M.; Helstrup, H.; Herghelegiu, A.; Herlant, S.; Herrera Corral, G.; Herrmann, N.; Hetland, K.; Hille, P.; Hinke, H.; Hippolyte, B.; Hoch, M.; Hoebbel, H.; Hoedlmoser, H.; Horaguchi, T.; Horner, M.; Hristov, P.; Hřivnáčová, I.; Hu, S.; Guo, C. Hu; Humanic, T.; Hurtado, A.; Hwang, D. S.; Ianigro, J. C.; Idzik, M.; Igolkin, S.; Ilkaev, R.; Ilkiv, I.; Imhoff, M.; Innocenti, P. G.; Ionescu, E.; Ippolitov, M.; Irfan, M.; Insa, C.; Inuzuka, M.; Ivan, C.; Ivanov, A.; Ivanov, M.; Ivanov, V.; Jacobs, P.; Jacholkowski, A.; Jančurová, L.; Janik, R.; Jasper, M.; Jena, C.; Jirden, L.; Johnson, D. P.; Jones, G. T.; Jorgensen, C.; Jouve, F.; Jovanović, P.; Junique, A.; Jusko, A.; Jung, H.; Jung, W.; Kadija, K.; Kamal, A.; Kamermans, R.; Kapusta, S.; Kaidalov, A.; Kakoyan, V.; Kalcher, S.; Kang, E.; Kapitan, J.; Kaplin, V.; Karadzhev, K.; Karavichev, O.; Karavicheva, T.; Karpechev, E.; Karpio, K.; Kazantsev, A.; Kebschull, U.; Keidel, R.; Mohsin Khan, M.; Khanzadeev, A.; Kharlov, Y.; Kikola, D.; Kileng, B.; Kim, D.; Kim, D. S.; Kim, D. W.; Kim, H. N.; Kim, J. S.; Kim, S.; Kinson, J. B.; Kiprich, S. K.; Kisel, I.; Kiselev, S.; Kisiel, A.; Kiss, T.; Kiworra, V.; Klay, J.; Klein Bösing, C.; Kliemant, M.; Klimov, A.; Klovning, A.; Kluge, A.; Kluit, R.; Kniege, S.; Kolevatov, R.; Kollegger, T.; Kolojvari, A.; Kondratiev, V.; Kornas, E.; Koshurnikov, E.; Kotov, I.; Kour, R.; Kowalski, M.; Kox, S.; Kozlov, K.; Králik, I.; Kramer, F.; Kraus, I.; Kravčáková, A.; Krawutschke, T.; Krivda, M.; Kryshen, E.; Kucheriaev, Y.; Kugler, A.; Kuhn, C.; Kuijer, P.; Kumar, L.; Kumar, N.; Kumpumaeki, P.; Kurepin, A.; Kurepin, A. N.; Kushpil, S.; Kushpil, V.; Kutovsky, M.; Kvaerno, H.; Kweon, M.; Labbé, J.-C.; Lackner, F.; Ladron de Guevara, P.; Lafage, V.; La Rocca, P.; Lamont, M.; Lara, C.; Larsen, D. T.; Laurenti, G.; Lazzeroni, C.; Le Bornec, Y.; Le Bris, N.; Le Gailliard, C.; Lebedev, V.; Lecoq, J.; Lee, K. S.; Lee, S. C.; Lefévre, F.; Legrand, I.; Lehmann, T.; Leistam, L.; Lenoir, P.; Lenti, V.; Leon, H.; Monzon, I. Leon; Lévai, P.; Li, Q.; Li, X.; Librizzi, F.; Lietava, R.; Lindegaard, N.; Lindenstruth, V.; Lippmann, C.; Lisa, M.; Listratenko, O. M.; Littel, F.; Liu, Y.; Lo, J.; Lobanov, V.; Loginov, V.; López Noriega, M.; López-Ramírez, R.; López Torres, E.; Lorenzo, P. M.; Løvhøiden, G.; Lu, S.; Ludolphs, W.; Lunardon, M.; Luquin, L.; Lusso, S.; Lutz, J.-R.; Luvisetto, M.; Lyapin, V.; Maevskaya, A.; Magureanu, C.; Mahajan, A.; Majahan, S.; Mahmoud, T.; Mairani, A.; Mahapatra, D.; Makarov, A.; Makhlyueva, I.; Malek, M.; Malkiewicz, T.; Mal'Kevich, D.; Malzacher, P.; Mamonov, A.; Manea, C.; Mangotra, L. K.; Maniero, D.; Manko, V.; Manso, F.; Manzari, V.; Mao, Y.; Marcel, A.; Marchini, S.; Mareš, J.; Margagliotti, G. V.; Margotti, A.; Marin, A.; Marin, J.-C.; Marras, D.; Martinengo, P.; Martínez, M. I.; Martinez-Davalos, A.; Martínez Garcia, G.; Martini, S.; Marzari Chiesa, A.; Marzocca, C.; Masciocchi, S.; Masera, M.; Masetti, M.; Maslov, N. I.; Masoni, A.; Massera, F.; Mast, M.; Mastroserio, A.; Matthews, Z. L.; Mayer, B.; Mazza, G.; Mazzaro, M. D.; Mazzoni, A.; Meddi, F.; Meleshko, E.; Menchaca-Rocha, A.; Meneghini, S.; Meoni, M.; Mercado Perez, J.; Mereu, P.; Meunier, O.; Miake, Y.; Michalon, A.; Michinelli, R.; Miftakhov, N.; Mignone, M.; Mikhailov, K.; Milosevic, J.; Minaev, Y.; Minafra, F.; Mischke, A.; Miśkowiec, D.; Mitsyn, V.; Mitu, C.; Mohanty, B.; Moisa, D.; Molnar, L.; Mondal, M.; Mondal, N.; Montaño Zetina, L.; Monteno, M.; Morando, M.; Morel, M.; Moretto, S.; Morhardt, Th; Morsch, A.; Moukhanova, T.; Mucchi, M.; Muccifora, V.; Mudnic, E.; Müller, H.; Müller, W.; Munoz, J.; Mura, D.; Musa, L.; Muraz, J. F.; Musso, A.; Nania, R.; Nandi, B.; Nappi, E.; Navach, F.; Navin, S.; Nayak, T.; Nazarenko, S.; Nazarov, G.; Nellen, L.; Nendaz, F.; Nianine, A.; Nicassio, M.; Nielsen, B. S.; Nikolaev, S.; Nikolic, V.; Nikulin, S.; Nikulin, V.; Nilsen, B.; Nitti, M.; Noferini, F.; Nomokonov, P.; Nooren, G.; Noto, F.; Nouais, D.; Nyiri, A.; Nystrand, J.; Odyniec, G.; Oeschler, H.; Oinonen, M.; Oldenburg, M.; Oleks, I.; Olsen, E. K.; Onuchin, V.; Oppedisano, C.; Orsini, F.; Ortiz-Velázquez, A.; Oskamp, C.; Oskarsson, A.; Osmic, F.; Österman, L.; Otterlund, I.; Ovrebekk, G.; Oyama, K.; Pachr, M.; Pagano, P.; Paić, G.; Pajares, C.; Pal, S.; Pal, S.; Pálla, G.; Palmeri, A.; Pancaldi, G.; Panse, R.; Pantaleo, A.; Pappalardo, G. S.; Pastirčák, B.; Pastore, C.; Patarakin, O.; Paticchio, V.; Patimo, G.; Pavlinov, A.; Pawlak, T.; Peitzmann, T.; Pénichot, Y.; Pepato, A.; Pereira, H.; Peresunko, D.; Perez, C.; Perez Griffo, J.; Perini, D.; Perrino, D.; Peryt, W.; Pesci, A.; Peskov, V.; Pestov, Y.; Peters, A. J.; Petráček, V.; Petridis, A.; Petris, M.; Petrov, V.; Petrov, V.; Petrovici, M.; Peyré, J.; Piano, S.; Piccotti, A.; Pichot, P.; Piemonte, C.; Pikna, M.; Pilastrini, R.; Pillot, P.; Pinazza, O.; Pini, B.; Pinsky, L.; Pinto Morais, V.; Pismennaya, V.; Piuz, F.; Platt, R.; Ploskon, M.; Plumeri, S.; Pluta, J.; Pocheptsov, T.; Podesta, P.; Poggio, F.; Poghosyan, M.; Poghosyan, T.; Polák, K.; Polichtchouk, B.; Polozov, P.; Polyakov, V.; Pommeresch, B.; Pompei, F.; Pop, A.; Popescu, S.; Posa, F.; Pospíšil, V.; Potukuchi, B.; Pouthas, J.; Prasad, S.; Preghenella, R.; Prino, F.; Prodan, L.; Prono, G.; Protsenko, M. A.; Pruneau, C. A.; Przybyla, A.; Pshenichnov, I.; Puddu, G.; Pujahari, P.; Pulvirenti, A.; Punin, A.; Punin, V.; Putschke, J.; Quartieri, J.; Quercigh, E.; Rachevskaya, I.; Rachevski, A.; Rademakers, A.; Radomski, S.; Radu, A.; Rak, J.; Ramello, L.; Raniwala, R.; Raniwala, S.; Rasmussen, O. B.; Rasson, J.; Razin, V.; Read, K.; Real, J.; Redlich, K.; Reichling, C.; Renard, C.; Renault, G.; Renfordt, R.; Reolon, A. R.; Reshetin, A.; Revol, J.-P.; Reygers, K.; Ricaud, H.; Riccati, L.; Ricci, R. A.; Richter, M.; Riedler, P.; Rigalleau, L. M.; Riggi, F.; Riegler, W.; Rindel, E.; Riso, J.; Rivetti, A.; Rizzi, M.; Rizzi, V.; Rodriguez Cahuantzi, M.; Røed, K.; Röhrich, D.; Román-López, S.; Romanato, M.; Romita, R.; Ronchetti, F.; Rosinsky, P.; Rosnet, P.; Rossegger, S.; Rossi, A.; Rostchin, V.; Rotondo, F.; Roukoutakis, F.; Rousseau, S.; Roy, C.; Roy, D.; Roy, P.; Royer, L.; Rubin, G.; Rubio, A.; Rui, R.; Rusanov, I.; Russo, G.; Ruuskanen, V.; Ryabinkin, E.; Rybicki, A.; Sadovsky, S.; Šafařík, K.; Sahoo, R.; Saini, J.; Saiz, P.; Salur, S.; Sambyal, S.; Samsonov, V.; Šándor, L.; Sandoval, A.; Sann, H.; Santiard, J.-C.; Santo, R.; Santoro, R.; Sargsyan, G.; Saturnini, P.; Scapparone, E.; Scarlassara, F.; Schackert, B.; Schiaua, C.; Schicker, R.; Schioler, T.; Schippers, J. D.; Schmidt, C.; Schmidt, H.; Schneider, R.; Schossmaier, K.; Schukraft, J.; Schutz, Y.; Schwarz, K.; Schweda, K.; Schyns, E.; Scioli, G.; Scomparin, E.; Snow, H.; Sedykh, S.; Segato, G.; Sellitto, S.; Semeria, F.; Senyukov, S.; Seppänen, H.; Serci, S.; Serkin, L.; Serra, S.; Sesselmann, T.; Sevcenco, A.; Sgura, I.; Shabratova, G.; Shahoyan, R.; Sharkov, E.; Sharma, S.; Shigaki, K.; Shileev, K.; Shukla, P.; Shurygin, A.; Shurygina, M.; Sibiriak, Y.; Siddi, E.; Siemiarczuk, T.; Sigward, M. H.; Silenzi, A.; Silvermyr, D.; Silvestri, R.; Simili, E.; Simion, V.; Simon, R.; Simonetti, L.; Singaraju, R.; Singhal, V.; Sinha, B.; Sinha, T.; Siska, M.; Sitár, B.; Sitta, M.; Skaali, B.; Skowronski, P.; Slodkowski, M.; Smirnov, N.; Smykov, L.; Snellings, R.; Snoeys, W.; Soegaard, C.; Soerensen, J.; Sokolov, O.; Soldatov, A.; Soloviev, A.; Soltveit, H.; Soltz, R.; Sommer, W.; Soos, C.; Soramel, F.; Sorensen, S.; Soyk, D.; Spyropoulou-Stassinaki, M.; Stachel, J.; Staley, F.; Stan, I.; Stavinskiy, A.; Steckert, J.; Stefanini, G.; Stefanek, G.; Steinbeck, T.; Stelzer, H.; Stenlund, E.; Stocco, D.; Stockmeier, M.; Stoicea, G.; Stolpovsky, P.; Strmeň, P.; Stutzmann, J. S.; Su, G.; Sugitate, T.; Šumbera, M.; Suire, C.; Susa, T.; Sushil Kumar, K.; Swoboda, D.; Symons, J.; Szarka, I.; Szostak, A.; Szuba, M.; Szymanski, P.; Tadel, M.; Tagridis, C.; Tan, L.; Tapia Takaki, D.; Taureg, H.; Tauro, A.; Tavlet, M.; Tejeda Munoz, G.; Thäder, J.; Tieulent, R.; Timmer, P.; Tolyhy, T.; Topilskaya, N.; Torcato de Matos, C.; Torii, H.; Toscano, L.; Tosello, F.; Tournaire, A.; Traczyk, T.; Tröger, G.; Tromeur, W.; Truesdale, D.; Trzaska, W.; Tsiledakis, G.; Tsilis, E.; Tsvetkov, A.; Turcato, M.; Turrisi, R.; Tuveri, M.; Tveter, T.; Tydesjo, H.; Tykarski, L.; Tywoniuk, K.; Ugolini, E.; Ullaland, K.; Urbán, J.; Urciuoli, G. M.; Usai, G. L.; Usseglio, M.; Vacchi, A.; Vala, M.; Valiev, F.; Vande Vyvre, P.; Van Den Brink, A.; Van Eijndhoven, N.; Van Der Kolk, N.; van Leeuwen, M.; Vannucci, L.; Vanzetto, S.; Vanuxem, J.-P.; Vargas, M. A.; Varma, R.; Vascotto, A.; Vasiliev, A.; Vassiliou, M.; Vasta, P.; Vechernin, V.; Venaruzzo, M.; Vercellin, E.; Vergara, S.; Verhoeven, W.; Veronese, F.; Vetlitskiy, I.; Vernet, R.; Victorov, V.; Vidak, L.; Viesti, G.; Vikhlyantsev, O.; Vilakazi, Z.; Villalobos Baillie, O.; Vinogradov, A.; Vinogradov, L.; Vinogradov, Y.; Virgili, T.; Viyogi, Y.; Vodopianov, A.; Volpe, G.; Vranic, D.; Vrláková, J.; Vulpescu, B.; Wabnitz, C.; Wagner, V.; Wallet, L.; Wan, R.; Wang, Y.; Wang, Y.; Wheadon, R.; Weis, R.; Wen, Q.; Wessels, J.; Westergaard, J.; Wiechula, J.; Wiesenaecker, A.; Wikne, J.; Wilk, A.; Wilk, G.; Williams, C.; Willis, N.; Windelband, B.; Witt, R.; Woehri, H.; Wyllie, K.; Xu, C.; Yang, C.; Yang, H.; Yermia, F.; Yin, Z.; Yin, Z.; Ky, B. Yun; Yushmanov, I.; Yuting, B.; Zabrodin, E.; Zagato, S.; Zagreev, B.; Zaharia, P.; Zalite, A.; Zampa, G.; Zampolli, C.; Zanevskiy, Y.; Zarochentsev, A.; Zaudtke, O.; Závada, P.; Zbroszczyk, H.; Zepeda, A.; Zeter, V.; Zgura, I.; Zhalov, M.; Zhou, D.; Zhou, S.; Zhu, G.; Zichichi, A.; Zinchenko, A.; Zinovjev, G.; Zoccarato, Y.; Zubarev, A.; Zucchini, A.; Zuffa, M.

    2008-08-01

    ALICE (A Large Ion Collider Experiment) is a general-purpose, heavy-ion detector at the CERN LHC which focuses on QCD, the strong-interaction sector of the Standard Model. It is designed to address the physics of strongly interacting matter and the quark-gluon plasma at extreme values of energy density and temperature in nucleus-nucleus collisions. Besides running with Pb ions, the physics programme includes collisions with lighter ions, lower energy running and dedicated proton-nucleus runs. ALICE will also take data with proton beams at the top LHC energy to collect reference data for the heavy-ion programme and to address several QCD topics for which ALICE is complementary to the other LHC detectors. The ALICE detector has been built by a collaboration including currently over 1000 physicists and engineers from 105 Institutes in 30 countries. Its overall dimensions are 16 × 16 × 26 m3 with a total weight of approximately 10 000 t. The experiment consists of 18 different detector systems each with its own specific technology choice and design constraints, driven both by the physics requirements and the experimental conditions expected at LHC. The most stringent design constraint is to cope with the extreme particle multiplicity anticipated in central Pb-Pb collisions. The different subsystems were optimized to provide high-momentum resolution as well as excellent Particle Identification (PID) over a broad range in momentum, up to the highest multiplicities predicted for LHC. This will allow for comprehensive studies of hadrons, electrons, muons, and photons produced in the collision of heavy nuclei. Most detector systems are scheduled to be installed and ready for data taking by mid-2008 when the LHC is scheduled to start operation, with the exception of parts of the Photon Spectrometer (PHOS), Transition Radiation Detector (TRD) and Electro Magnetic Calorimeter (EMCal). These detectors will be completed for the high-luminosity ion run expected in 2010. This

  19. Soft QCD, minimum bias and diffraction: results from ALICE

    Directory of Open Access Journals (Sweden)

    Antonioli Pietro

    2012-06-01

    Full Text Available We report recent results from the ALICE experiment at the LHC for minimum bias pp collisions. This overview includes results on inelastic cross section, with analysis of single and double diffractive events; the study of hadron production mechanisms, both for inclusive and identified particles; Bose-Einstein correlations; and fluctuations in 〈PT〉.

  20. Overview of jet physics with ALICE at the LHC

    Directory of Open Access Journals (Sweden)

    Wang Mengliang

    2016-01-01

    Full Text Available In these proceedings, a selection of recent results on jet physics from ALICE experiment is presented, including jet spectra, nuclear modification factors, jet structure and fragmentation observables, obtained in different collision systems (pp, p–Pb and Pb–Pb.

  1. Improved performance of QCD code on ALiCE

    CERN Document Server

    Sroczynski, Z

    2003-01-01

    We present results for the performance of QCD code on ALiCE, the Alpha-Linux Cluster Engine at Wuppertal. We describe the techniques employed to optimise the code, including the metaprogramming of assembler kernels, the effects of data layout and an investigation into the overheads incurred by the communication.

  2. Improved performance of QCD code on ALiCE

    Science.gov (United States)

    Sroczynski, Z.

    2003-05-01

    We present results for the performance of QCD code on ALiCE , the Alpha-Linux Cluster Engine at Wuppertal. We describe the techniques employed to optimise the code, including the metaprogramming of assembler kernels, the effects of data layout and an investigation into the overheads incurred by the communication.

  3. A radial TPC for heavy ions

    CERN Document Server

    Garabatos, C

    2000-01-01

    The CERES experiment at the CERN SPS has been recently upgraded with a TPC with radial drift field, the first one of its sort. Constructed during 1998, it has been successfully operated in commissioning and physics runs, with muon, proton, and heavy-ion beams. A high voltage electrode of about 0.5 m radius is surrounded by sixteen 2 m long readout chambers, placed at a radius of 1.3 m, with chevron-shaped readout pads. The field cage is enclosed by two low-mass voltage degraders at each end of the cylindrical structure. A Ne-CO/sub 2/ [80-20] gas mixture allows for a safe operation and good transport properties under drift fields ranging from 200 to 600 V/cm. A spatial resolution better than 700 microns and 350 microns in r and rdelta (phi), respectively, has been achieved in a highly inhomogeneous magnetic field. Details of its construction as well as results of the operation and performance in a high multiplicity environment are presented. (0 refs).

  4. ALICE moves into warp drive.

    CERN Document Server

    CERN. Geneva

    2012-01-01

    A Large Ion Collider Experiment (ALICE) is the heavy-ion detector designed to study the physics of strongly interacting matter and the quark-gluon plasma at the CERN Large Hadron Collider (LHC). Since its successful start-up in 2010, the LHC has been performing outstandingly, providing to the experiments long periods of stable collisions and an integrated luminosity that greatly exceeds the planned targets. To fully explore these privileged conditions, we aim at maximizing the experiment's data taking productivity during stable collisions. We present in this paper the evolution of the online systems in order to spot reasons of inefficiency and address new requirements. This paper describes the features added to the ALICE Electronic Logbook (eLogbook) to allow the Run Coordination team to identify, prioritize, fix and follow causes of inefficiency in the experiment. Thorough monitoring of the data taking efficiency provides reports for the collaboration to portray its evolution and evaluate the measures (fix...

  5. Overview of recent ALICE results

    Directory of Open Access Journals (Sweden)

    Arnaldi Roberta

    2014-01-01

    Full Text Available ALICE is the LHC experiment devoted to the study of heavy-ion collisions. While results from Pb-Pb collisions at √sNN = 2.76 TeV provide insight on the properties of the plasma of quarks and gluons, formed in nucleus-nucleus interactions, the study of p-Pb collisions at √sNN = 5.02 TeV allows a deeper understanding of cold nuclear matter effects. Therefore, p-Pb results turn out to be a powerful tool to provide a baseline for Pb-Pb, to correctly quantify how the various observables are affected by genuine hot medium effects. In this proceeding, a selection of the most recent ALICE results on the medium global properties and on heavy-flavour and quarkonium production will be discussed.

  6. Layout of the ALICE detector

    CERN Multimedia

    2003-01-01

    The ALICE experiment will study the collisions of beams of lead nuclei in an attempt to produce a new state of matter known as 'quark-gluon plasma'. The barrel of the detector will be housed in the solenoid that once contained the L3 experiment when LEP was in operation at CERN, between 1989 and 2000. Outside of the solenoid, a dipole magnet will bend the path of charged particles called muons, allowing their momenta to be measured.

  7. The ALICE time projection chamber

    CERN Multimedia

    Maximilien Brice

    2005-01-01

    This time projection chamber is part of the ALICE detector on the new LHC accelerator at CERN. Particles produced in collisions at the core of the detector will follow paths outward through the various sub-detector layers. If these particles carry a charge, they will ionise the gas contained within this chamber producing an electric signal as the ions drift in the chamber's electric field.

  8. ALICE upgrades its powerful eyes

    CERN Multimedia

    Yuri Kharlov, ALICE Collaboration

    2013-01-01

    The ALICE Photon Spectrometer (PHOS) is a high-resolution photon detector that measures the photons coming out of the extremely hot plasma created in the lead-lead collisions at the LHC. Taking advantage of the long accelerator shut-down, the ALICE teams are now repairing and upgrading the existing modules and getting ready to install the brand-new module in time for the next run. The upgraded PHOS detector will be faster and more stable with wider acceptance and improved photon identification.   PHOS crystal matrix during repair. The key feature and the main complexity of the ALICE PHOS detector is that it operates at a temperature of -25°C, which makes it the second-coldest equipment element at the LHC after the cryogenic superconducting magnets. Since 2009 when it was installed, the PHOS detector, with its cold and warm volumes, has been immersed in airtight boxes to avoid condensation in the cold volumes. The 10,752 lead tungstate crystals of the PHOS were completely insulated fr...

  9. ALICE through the phase transition

    CERN Document Server

    CERN. Geneva

    2000-01-01

    While proton-proton collisions will be the principal diet of CERN's LHC machine, heavy-ion collisions will also be on the menu. The ALICE experiment will be ready and waiting. Another of ALICE's TDRs concerns the experiment's inner tracking system (ITS). This is the innermost layer of the detector, responsible for tracking emerging particles where their density will be at its highest. ALICE physicists have been working with colleagues from fellow LHC experiment LHCb to develop silicon pixel chips for the inner two layers of the ITS.The result is a chip with 50 x 425 mu m cells; a prototype detector based on this chip is being tested this year.The ITS has six layers, all using silicon technology, and about 10 million digital and 2 million analogue readout channels to digest the huge number of particles produced in LHC lead-ion collisions. The collaboration has opted for a hybrid ITS structure combining sensors, electronics and mechanical support. Beam tests so far have indicated that the ITS should achieve pos...

  10. Tests of gases in a mini-TPC with pixel chip readout

    Energy Technology Data Exchange (ETDEWEB)

    Vahsen, S. [University of Hawaii, 2505 Correa Road, Honolulu, HI 96822 (United States); Oliver-Mallory, K.; Lopez-Thibodeaux, M. [Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720 (United States); Kadyk, J., E-mail: jakadyk@lbl.gov [Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720 (United States); Garcia-Sciveres, M. [Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720 (United States)

    2014-02-21

    Gases for potential use as targets for directional dark matter detection were tested in a prototype detector using two sequential Gas Electron Multipliers, or GEMs. The sensitive volume consists of a mini-TPC of 12 cm length and 7.5 cm diameter. An FEI3 pixel chip, developed for the ATLAS experiment, was used to produce spatial measurements with high resolution. An Fe55 source produced photoelectrons by X-ray conversions in the sensitive volume, and images of these were recorded by the chip. Spatial resolution plots are shown for the gases, which include the practical electron range of the photoelectrons and the effects of diffusion in the mini-TPC. Avalanche gain and gain resolution measurements were made for the four gases tested, at atmospheric and sub-atmospheric pressures: Ar(70)/CO{sub 2}(30), CF{sub 4}, He(80)/CF{sub 4}(20) and He(80)/isobutane(20)

  11. Free electron lifetime achievements in liquid Argon imaging TPC

    Energy Technology Data Exchange (ETDEWEB)

    Baibussinov, B; Ceolin, M Baldo; Centro, S; Cieslik, K; Farnese, C; Fava, A; Gibin, D; Guglielmi, A; Meng, G; Pietropaolo, F; Varanini, F; Ventura, S [INFN, Sezione di Padova via Marzolo 8, I-35131 Padova (Italy); Calligarich, E [INFN, Sezione di Pavia via Bassi 6, I-27100 Pavia (Italy); Rubbia, C, E-mail: Carlo.Rubbia@cern.c [Laboratori Nazionali del Gran Sasso dell' INFN I-67010 Assergi (Italy)

    2010-03-15

    A key feature for the success of the liquid Argon imaging TPC (LAr-TPC) technology is the industrial purification against electro-negative impurities, especially Oxygen and Nitrogen remnants, which have to be continuously kept at an exceptionally low level by filtering and recirculating liquid Argon. Improved purification techniques have been applied to a 120 liters LAr-TPC test facility in the INFN-LNL laboratory. Through-going muon tracks have been used to determine the free electron lifetime in liquid Argon against electro-negative impurities. The short path length here observed (30 cm) is compensated by the high accuracy in the observation of the specific ionization of cosmic ray muons at sea level as a function of the drift distance. A free electron lifetime of tau {approx} (21.4{sup +7.3}{sub -4.3}) ms, namely > 15.8 ms at 90% C.L. has been observed over several weeks under stable conditions, corresponding to a residual Oxygen equivalent of {approx} 15 ppt (part per trillion). At 500 V/cm, the free electron speed is 1.5 mm/mus. In a LAr-TPC a free electron lifetime in excess of 15 ms corresponds for instance to an attenuation of less than 20% after a drift path of 5 m, opening the way to the operation of the LAr-TPC with exceptionally long drift distances.

  12. Analysis and optimization of energy resolution of neutron-TPC

    Institute of Scientific and Technical Information of China (English)

    黄孟; 李玉兰; 牛莉博; 李金; 李元景

    2015-01-01

    Neutron-TPC (nTPC) is a fast neutron spectrometer based on GEM-TPC (Gas Electron Multiplier-Time Pro-jection Chamber) and expected to be used in nuclear physics, nuclear reactor operation monitoring, and thermo-nuclear fusion plasma diagnostics. By measuring the recoiled proton energy and slopes of the proton tracks, the incident neutron energy can be deduced. It has higher n/γseparation ability and higher detection efficiency than conventional neutron spectrometers. In this paper, neutron energy resolution of nTPC is studied using the analytical method. It is found that the neutron energy resolution is determined by 1) the proton energy resolu-tion (σEp/Ep), and 2) standard deviation of slopes of the proton tracks caused by multiple Coulomb scattering (σk(scat ering)) and by the track fitting accuracy (σk(fit)). Suggestions are made for optimizing energy resolution of nTPC. Proper choices of the cut parameters of reconstructed proton scattering angles (θcut), the number of fitting track points (N ), and the working gas help to improve the neutron energy resolution.

  13. ALICE Time of Flight Construction of MRPCs

    CERN Multimedia

    2003-01-01

    Particles are identified in ALICE by time-of-flight (TOF); heavier particles are slower and it takes for them longer to reach the outer layers of the detector. For TOF system ALICE uses detectors called multigap resistive plate chambers, like the prototype shown here.

  14. NOTE receives the prestigious ALICE Industrial Award

    CERN Multimedia

    2006-01-01

    "NOTE Lund has been given the ALICE Industrial Award due to good co-operation, great capacity for innovation and high quality of work, as a PCB manufacturer in the CERN project ALICE. Only a small number of awards have so far been conferred to a select number of companies."

  15. Interview with Jurgen Schukraft, ALICE Spokesperson

    CERN Multimedia

    CERN Video Productions

    2009-01-01

    Questions : 1. How does it feel to be the Spokesperson of a large worldwide collaboration as ALICE at the very moment when the LHC is going to produce the first data? 2. Is ALICE ready for data taking? 3. Did you take advantage of the long shut down? 4. What was ALICE designed for? 5. What can you expect to find at 3.5 TeV per beam and later at 7? 6. Is ALICE going to take data only with the lead iron beams from the LHC? 7. Can you tell us more about the primordial soup of gluons and quarks? 8. What is going to happen in the ALICE control room on collision day?

  16. Test System for Standard ALICE DCS Components

    CERN Document Server

    AUTHOR|(CDS)2160773

    2016-01-01

    Currently, the ALICE DCS project is supervising equipment installed in the ALICE experiment site at CERN. Hence, the aim of this project was to provide a test bench in the DCS lab, where a real equipment and software tools will be deployed. Using this test bench, test procedures which exercise the devices under the test in a configurable way and provide logging and trending of the acquired data were implemented. The setup was devised using the ALICE software framework and Siemens SCADA system WINCC OA, providing the same functionality as the systems installed in ALICE, and will be used for the commissioning of the new software and hardware, burn-in tests of new modules and log-term stability tests of ALICE hardware.

  17. ALICE gets its first ‘upgrade’

    CERN Multimedia

    2009-01-01

    The ALICE experiment has reached another milestone with the successful installation of the first two modules of the electromagnetic calorimeter. Preparations for installing the EMCal in the ALICE cavern. On 17 and 19 March the first two sections of the electromagnetic calorimeter (EMCal) were fitted in the ALICE cavern. The full EMCal, a lead-scintillator sampling calorimeter, will be made up of 12 separate modules plus 2 half modules. Weighing 8 tons each, these modules required a whole new support structure to be built and a sophisticated ‘bridge’ device (pictured) to install them in situ. Project Leader, Tom Cormier from Wayne State University, notes that: "The EMCal is a late addition to ALICE, arriving in effect as a first upgrade. Indeed full approval with construction funds occurred only in early 2008." Although ALICE has excellent momentum measurement and identification capabilities for charged hadrons it previously lac...

  18. Studies for dimuon measurement with ALICE

    Energy Technology Data Exchange (ETDEWEB)

    Jouan, D. [Institut de Physique, Orsay (France)

    1995-07-15

    The idea of measuring dimuon in the ALICE detector is not new, since it already appeared in the Aachen Conference. In the meantime studies were aiming at the use of the two detectors of LHC p-p physics, CMS and ATLAS, already dedicated to dimuon measurement, for these same measurements in heavy ion collisions, whereas the detector dedicated to heavy ions physics at LHC, ALICE, was considering all the other observables. Recently, the interest for dimuon measurements in ALICE was renewed by demands from LHC committee, stiring the activities of a working group in the ALICE collaboration, also associated to a more recent move from new groups. In the following the author briefly describes the interest of measuring dimuons in heavy ion collisions, particularly in ALICE, then the experimental strategy and first estimates of the performances that could be reached with the proposed system.

  19. Track 69 (Alice Paczkowski)

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This document includes memorandums, agreement for the purchase of lands, confirmation of final title examination, certificate of inspection and possession, report of...

  20. Recent hadronic resonance measurements at ALICE

    CERN Document Server

    Knospe, A.G.

    2016-01-01

    In heavy-ion physics, measurements of short-lived hadronic resonances allow the properties of the hadronic phase of the collision to be studied. In addition, resonances can be used along with stable hadrons to study parton energy loss in the quark-gluon plasma and the mechanisms that shape hadron pT spectra at intermediate transverse momenta. Resonance measurements in small systems serve as a reference for heavy-ion collisions and contribute to searches for collective effects. An overview of recent results on hadronic resonance production measured in ALICE is presented. These results include the pT spectra and yields of the rho(770)0, K*(892)0, and phi(1020) mesons in pp, p-Pb, and Pb-Pb collisions at different energies as well as the Sigma(1385)+/- and Xi(1530)0 baryons in pp and p-Pb collisions.

  1. Soft QGP probes with ALICE

    CERN Document Server

    Graczykowski, Łukasz Kamil

    2016-01-01

    In heavy-ion collisions at the LHC a hot and dense medium of deconfided partons, the Quark-Gluon Plasma (QGP), is created. Its global properties can be characterized by the measurements of particles in the low transverse momentum (or "soft") regime, which represent the majority of created particles. In this report we outline a selection of measurements of the soft probes by the ALICE experiment in pp, p--Pb, and Pb--Pb collisions. The paper focuses on recent flow measurements via angular correlations and femtoscopic studies. The first ever preliminary analysis of $\\mathrm{K}^0_{\\rm S}\\mathrm{K}^{\\pm}$ femtoscopy is also presented.

  2. 77 FR 21761 - Alice Falls Corporation, Alice Falls Hydro, LLC; Notice of Application for Transfer of License...

    Science.gov (United States)

    2012-04-11

    ... Energy Regulatory Commission Alice Falls Corporation, Alice Falls Hydro, LLC; Notice of Application for Transfer of License, and Soliciting Comments and Motions To Intervene On February 23, 2012, Alice Falls Corporation (transferor) and Alice Falls Hydro, LLC (transferee) filed an ] application for transfer...

  3. The ALICE analysis train system

    CERN Document Server

    Zimmermann, Markus

    2015-01-01

    In the ALICE experiment hundreds of users are analyzing big datasets on a Grid system. High throughput and short turn-around times are achieved by a centralized system called the LEGO trains. This system combines analysis from different users in so-called analysis trains which are then executed within the same Grid jobs thereby reducing the number of times the data needs to be read from the storage systems. The centralized trains improve the performance, the usability for users and the bookkeeping in comparison to single user analysis. The train system builds upon the already existing ALICE tools, i.e. the analysis framework as well as the Grid submission and monitoring infrastructure. The entry point to the train system is a web interface which is used to configure the analysis and the desired datasets as well as to test and submit the train. Several measures have been implemented to reduce the time a train needs to finish and to increase the CPU efficiency.

  4. Scale model of the ALICE detector arrives from India.

    CERN Multimedia

    Maximilien Brice

    2002-01-01

    A 1:10 scale model of the ALICE detector, designed and built in India, has arrived at CERN. Photo 01: Members of the ALICE Technical Board pictured with the detector model in building 40. Photos 02 03: (left to right) Christian Fabjan, ALICE technical coordinator; Yogendra Viyogi, Photon Multiplicity Detector (PMD) project leader and ALICE representative from the Variable Energy Cyclotron Centre (VECC), Calcutta; and Jurgen Schukraft, spokesperson for the ALICE collaboration.

  5. More Than ALICE: Development of an augmented reality mobile application for the ALICE detector

    CERN Document Server

    Ouellette, Jeff

    2016-01-01

    More Than ALICE is a mobile application for iOS and Android built in the Unity Engine. This project concerns the development of the second edition of the application, which is meant to completely succeed the original version built in 2014. The purpose of the application is to describe the various components of the ALICE detector and to overlay live collisions to increase public awareness for the research goals of the ALICE collaboration. The application provides an augmented reality (AR) interface via the Vuforia SDK to track images of the ALICE detector or components of the paper model of ALICE that can be purchased at the ALICE secretariat office. For those without access to either images of the detector or the detector model, the app provides a virtual detector model (VR) that contains the same functionality as the augmented reality.

  6. Development of a TPC for an ILC Detector

    CERN Document Server

    Diener, R

    2012-01-01

    The ILD concept, one of two proposed detector concepts for the planned International Linear Collider (ILC), foresees a Time Projection Chamber (TPC) as the main tracking detector. The LCTPC (Linear Collider TPC) collaboration pursues R&D to develop such a TPC based on the best state-of-the-art technology. After tests with smaller prototypes, the current efforts focus on studies using a large prototype with a diameter of 770 mm and a length of 610 mm. This prototype can accommodate seven read-out modules of a size comparable to the ones that would be used in the final TPC. Several prototypes of modules using Micromegas or GEM structures as gas amplification were constructed and tested. Besides the traditional pad read-out, a pixel read-out based on the TimePix chip is studied in these tests with up to 8 TimePix chips on a board. The current status and future plans of the R&D are presented.

  7. The ALICE data acquisition system

    CERN Document Server

    Carena, F; Chapeland, S; Chibante Barroso, V; Costa, F; Dénes, E; Divià, R; Fuchs, U; Grigore, A; Kiss, T; Simonetti, G; Soós, C; Telesca, A; Vande Vyvre, P; Von Haller, B

    2014-01-01

    In this paper we describe the design, the construction, the commissioning and the operation of the Data Acquisition (DAQ) and Experiment Control Systems (ECS) of the ALICE experiment at the CERN Large Hadron Collider (LHC). The DAQ and the ECS are the systems used respectively for the acquisition of all physics data and for the overall control of the experiment. They are two computing systems made of hundreds of PCs and data storage units interconnected via two networks. The collection of experimental data from the detectors is performed by several hundreds of high-speed optical links. We describe in detail the design considerations for these systems handling the extreme data throughput resulting from central lead ions collisions at LHC energy. The implementation of the resulting requirements into hardware (custom optical links and commercial computing equipment), infrastructure (racks, cooling, power distribution, control room), and software led to many innovative solutions which are described together with ...

  8. Alice'i imedemaa Pariisis / Isabel Chiang

    Index Scriptorium Estoniae

    Chiang, Isabel

    2000-01-01

    1998. a. Pariisis Catherine Alice Mamet' poolt asutatud mööblisalongist, seal tegutsevate disainerite (Pucci de Rossi, Satch, Guy Ferrer, Pablo Pares jt.) loomingunäiteid. Pariisis disaini õppiva tudengi Isabel Chiangi eluloolisi andmeid. 15 illustratsiooni

  9. ... ALICE forges ahead with further detectors

    CERN Multimedia

    2006-01-01

    Following the installation of the HMPID, the project has progressed swiftly with further detectors being lowered into the ALICE cavern. The first supermodule of the ALICE transition radiation detector was successfully installed on 10 October. The TRD collaborators from Germany standing next to the supermodule mounted in a rotating frame (bottom left corner) in the ALICE cavern. In the final configuration, 18 supermodules that make up the transition radiation detector will cylindrically surround the large time projection chamber in the central barrel of the ALICE experiment. Each supermodule is about 7 metre long and consists of 30 drift chambers in six layers. The construction of the modules is a collaboration between five institutes in Germany (Universities of Frankfurt and Heidelberg and Gesellschaft fuer Schwerionenforschung mbH in Darmstadt), Romania (NIPNE Bucharest) and Russia (JINR Dubna) with radiators (See 'Did you know?' section) produced at the University of Muenster, Germany. During the summer, ...

  10. Transverse momentum spectra of hadrons identified with the ALICE Inner Tracking System

    CERN Document Server

    Milano, L.

    2013-01-01

    The Inner Tracking System is the ALICE detector closest to the beam axis. It is composed of six layers of silicon detectors: two innermost layers of Silicon Pixel Detectors (SPD), two intermediate layers of Silicon Drift Detectors (SDD) and two outermost layers of Silicon Strip Detectors (SSD). The ITS can be used as a standalone tracker in order to recover tracks that are not reconstructed by the Time Projection Chamber (TPC) and to reconstruct low momentum particles with $p_{t}$ down to 100 MeV/c. Particle identification in the ITS is performed by measuring the energy loss signal in the SDD and SSD layers. The ITS allows to extend the charged particle identification capability in the ALICE central rapidity region at low $p_{t}$: it is possible to separate $\\pi/K$ in the range 100 MeV/c $< p_{t} <$ 500 MeV/c and $K/p$ in the range 200 MeV/c $ < p_{t} <$ 800 MeV/c. The identification of hadron in the ITS will be discussed in detail, different methods used to extract the $p_{t}$ spectra of $\\pi, K$...

  11. Detección de muones atmosféricos en el experimento ALICE-LHC

    CERN Document Server

    Rodríguez Cahuantzi, Mario; Cuautle Flores, Eleazar

    The calibration, alignment and commissioning of most of the ALICE (A Large Ion Collider Experiment at the CERN LHC) detectors have required a large amount of cosmic events during 2010, 2011, 2012 and 2013. Two main triggers were implemented to collect the atmospheric muons crossing the experiment. The first trigger, called “ACORDE trigger”, is generated by 60 scintillators located on the top three sides of the L3 magnet surrounding the central detectors, and selects single muons and bundles of atmospheric muons.
 The second trigger, called “TOF trigger”, is obtained by requiring a simultaneous signal on some pads of the Time of Flight (TOF) detector. The analysis of multi-muon events triggered by ACORDE and TOF and reconstructed using the ALICE Time Projection Chamber (TPC) is presented. A special emphasis in the study of muon bundles, with a particular attention on high muon density events is discussed. In particular the muon multiplicity distribution, that gives information on the primary cosmic ...

  12. Measurement of the charged-particle multiplicity in proton-proton collisions with the ALICE detector

    Energy Technology Data Exchange (ETDEWEB)

    Grosse-Oetringhaus, Jan Fiete

    2009-04-17

    This thesis has introduced the theoretical framework to describe multiple-particle production. The functioning of two event generators, Pythia and Phojet, as well as theoretical descriptions of the charged-particle multiplicity have been discussed. A summary of pseudorapidity-density (dN{sub ch}/d{eta}) and multiplicity-distribution measurements of charged particles has been presented. Existing results have been shown in an energy range of {radical}(s) = 6GeV to 1.8TeV from bubble chamber experiments and detectors at the ISR, Sp anti pS, and Tevatron. The validity of the introduced models was reviewed and the behavior as function of {radical}(s) was discussed. Analysis procedures for two basic measurements with ALICE, the pseudorapidity density and the multiplicity distribution of charged particles, have been developed. The former allows corrections on a bin-by-bin basis, while the latter requires unfolding of the measured distribution. The procedures have been developed for two independent subdetectors of ALICE, the Silicon Pixel Detector (SPD) and the Time-Projection Chamber (TPC). This allows the comparison of the analysis result in the overlapping regions as an independent cross-check of the measured distribution. Their implementation successfully reproduces different assumed spectra. The procedures have been extensively tested on simulated data using two different event generators, Pythia and Phojet. A comprehensive list of systematic uncertainties was evaluated. Some of these uncertainties still require measured data to verify or extract their magnitude. (orig.)

  13. ALICE: Simulated lead-lead collision

    CERN Document Server

    2003-01-01

    This track is an example of simulated data modelled for the ALICE detector on the Large Hadron Collider (LHC) at CERN, which will begin taking data in 2008. ALICE will focus on the study of collisions between nuclei of lead, a heavy element that produces many different particles when collided. It is hoped that these collisions will produce a new state of matter known as the quark-gluon plasma, which existed billionths of a second after the Big Bang.

  14. ALICE takes its ITS to heart

    CERN Multimedia

    2007-01-01

    In the study of heavy-ion events, the ALICE Inner Tracking System must use the most delicate materials. A hundred physicists and engineers from around the world witnessed its impressive journey to the centre of the ALICE experiment. ALICE's ITS on its way into the TCP. On 15 March, after 15 years of development, construction, commissioning and testing, the Inner Tracking System (ITS) finally reached its ultimate destination at the heart of ALICE. With almost five square meters of double-sided silicon strip detectors and over one square meter of silicon drift detectors, ALICE's ITS is the largest system built for either type of silicon detector. In ALICE's search for heavy-ion events at the LHC, it is necessary for the ITS to be extremely lightweight and delicate. For this reason the ITS was designed and built using the smallest amounts of only the lightest materials, with the design team developing innovative construction and assembly systems. The team prepared in detail for the final transport from the fi...

  15. The fifth annual ALICE Industrial Awards ceremony on 9 March, 2007.

    CERN Multimedia

    2007-01-01

    The ALICE collaboration presents Quantum Corp with an award for the high performance cluster file system (StorNext) for the ALICE DAQ system, and for their outstanding cooperation in implementing the software.From left to right: Jurgen Schukraft (ALICE Spokesperson), Pierre vande Vyvre (ALICE DAQ), Hans Boggild (ALICE), Ewan Johnston (Quantum Corp.), Derek Barrilleaux (Quantum Corp.), Lance Hukill (Quantum Corp.), Ulrich Fuchs (ALICE DAQ), Catherine Decosse (ALICE) and Roberto Divia (ALICE DAQ).

  16. The ALICE High Level Trigger: status and plans

    Science.gov (United States)

    Krzewicki, Mikolaj; Rohr, David; Gorbunov, Sergey; Breitner, Timo; Lehrbach, Johannes; Lindenstruth, Volker; Berzano, Dario

    2015-12-01

    The ALICE High Level Trigger (HLT) is an online reconstruction, triggering and data compression system used in the ALICE experiment at CERN. Unique among the LHC experiments, it extensively uses modern coprocessor technologies like general purpose graphic processing units (GPGPU) and field programmable gate arrays (FPGA) in the data flow. Realtime data compression is performed using a cluster finder algorithm implemented on FPGA boards. These data, instead of raw clusters, are used in the subsequent processing and storage, resulting in a compression factor of around 4. Track finding is performed using a cellular automaton and a Kalman filter algorithm on GPGPU hardware, where both CUDA and OpenCL technologies can be used interchangeably. The ALICE upgrade requires further development of online concepts to include detector calibration and stronger data compression. The current HLT farm will be used as a test bed for online calibration and both synchronous and asynchronous processing frameworks already before the upgrade, during Run 2. For opportunistic use as a Grid computing site during periods of inactivity of the experiment a virtualisation based setup is deployed.

  17. Construction and performance of the ALICE Transition Radiation Detector

    Energy Technology Data Exchange (ETDEWEB)

    Emschermann, David

    2010-01-20

    The Transition Radiation Detector (TRD) has been designed to identify electrons in the pion dominated background of heavy-ions collisions. As electrons do not interact strongly, they allow to probe the early phase of the interaction. As trigger on high-p{sub t} e{sup +}e{sup -} pairs within 6.5 {mu}s after collision, the TRD can initiate the readout of the Time Projection Chamber (TPC). The TRD is composed of 18 super modules arranged in a barrel geometry in the central part of the ALICE detector. It offers almost 1.2 million readout channels on a total area of close to 700 m{sup 2}. The particle detection properties of the TRD depend crucially on details in the design of the cathode pad readout plane. The design parameters of the TRD readout pad plane are introduced and analysed regarding their physical properties. The noise patterns observed in the detector can be directly linked to the static pad capacitance distribution and corrected for it. A summary is then given of the TRD services infrastructure at CERN: a 70 kW low voltage system, a 1080 channel 2.5 kV high voltage setup and the Ethernet network serving more than 600 nodes. Two beam tests were conducted at the CERN PS accelerator in 2004 and 2007 using full sized TRD chambers from series production. Details on the setups are presented with particular emphasis on the custom tailored data acquisition systems. Finally the performance of the TRD is studied, focusing on the pion rejection capability and the excellent position resolution. (orig.)

  18. ARIADNE, a Photographic LAr TPC at the CERN Neutrino Platform

    CERN Document Server

    Mavrokoridis, K; Nessi, M; Roberts, A; Smith, N A; Touramanis, C; CERN. Geneva. SPS and PS Experiments Committee; SPSC

    2016-01-01

    This letter of intent describes a novel and innovative two-phase LAr TPC with photographic capabilities as an attractive alternative readout method to the currently accepted segmented THGEMs which will require many thousands of charge readout channels for kton-scale two-phase TPCs. These colossal LAr TPCs will be used for the future long-baseline-neutrino-oscillation experiments. Optical readout also presents many other clear advantages over current readout techniques such as ease of scalability, upgrade, installation and maintenance, and cost effectiveness. This technology has already been demonstrated at the Liverpool LAr facility with the photographic capturing of cosmic muon tracks and single gammas using a 40-litre prototype. We have now secured ERC funding to develop this further with the ARIADNE programme. ARIADNE will be a 1-ton two-phase LAr TPC utilizing THGEM and EMCCD camera readouts in order to photograph interactions, allowing for track reconstruction and particle identification. We are request...

  19. Analytical solutions for space charge fields in TPC drift volumes

    CERN Document Server

    Rossegger, S; Schnizer, B

    2011-01-01

    At high particle rates and high multiplicities, Time Projection Chambers can suffer from field distortions due to slow moving ions that accumulate within the drift volume. These variations modify the electron trajectory along the drift path, affecting the tracking performance of the detector. In order to calculate the track distortions due to an arbitrary space charge distribution in a TPC, novel representations of the Green's function for a TPC-like geometry were worked out. This analytical approach permits accurate predictions of track distortions due to an arbitrary space charge distribution (by solving the Langevin equation) as well as the possibility to benchmark common numerical methods to calculate such space charge fields. (C) 2011 Elsevier B.V. All rights reserved.

  20. Free electron lifetime achievements in Liquid Argon Imaging TPC

    CERN Document Server

    Baibussinov, B; Calligarich, E; Centro, S; Cieslik, K; Farnese, C; Fava, A; Gibin, D; Guglielmi, A; Meng, G; Pietropaolo, F; Rubbia, C; Varanini, F; Ventura, S

    2010-01-01

    A key feature for the success of the Liquid Argon TPC technology is the industrial purification against electro-negative impurities, especially Oxygen and Nitrogen remnants, which have to be initially and continuously kept at an exceptional purity. New purification techniques have been applied to a 120 litres LAr-TPC test facility in the INFN-LNL laboratory. Through-going muon tracks have been used to monitor the LAr purity. The short path length used (30 cm) is compensated by the high accuracy in the observation of the specific ionization of cosmic rays muons at sea level. A free electron lifetime of (21.4+7.3-4.3) ms, namely > 15.8 ms at 90 % C.L. has been observed under stable conditions over several weeks, corresponding to about 15 ppt (part per trillion) of Oxygen equivalent. At 500 V/cm, where the electron speed is approximately of 1.5 mm/us, the free electron lifetime >15 ms corresponds to an attenuation <15 % for a drift path of 5 m, opening the way to reliable operation of LAr TPC for exceptionall...

  1. Non-Uniform Electromagnetic Fields in the SAMURAI TPC

    Science.gov (United States)

    Estee, J.; Barney, J.; Chajecki, Z.; Chan, C. F.; Dunn, J. W.; Gilbert, J.; Lu, F.; Lynch, W. G.; Shane, R.; Tsang, M. B.; McIntosh, A. B.; Yennello, S. J.; Famiano, M.; Isobe, T.; Sakurai, H.; Taketani, A.; Murakami, T.; Samurai-Tpc Collaboration

    2011-10-01

    A Time Projection Chamber (TPC) is being developed for the SAMURAI dipole magnet at RIKEN. The main scientific objective for the TPC is to provide constraints on the nuclear symmetry at supra-saturation density. The poster presentation will discuss the design of the TPC field cage and the external electrodes that shape the high electric fields near the cathode. Garfield calculations of the electric field as well as TOSCA calculations of the magnetic field of the SAMURAI dipole will be shown and the impact of the non-uniformity of both fields on electron transport will be discussed. These non-uniformities can introduce components into the electron drift velocity in directions other than the expected vertical direction. This poster presentation will discuss the initial design of a laser calibration system, which will be used to calibrate away the influence of these non-uniformities in the electric and magnetic fields. This work is supported by the DOE under Grant DE-SC0004835.

  2. Pad Plane Design and Readout for SAMURAI TPC

    Science.gov (United States)

    Barney, J.; Chajecki, Z.; Chan, C. F.; Dunn, J. W.; Estee, J.; Gilbert, J.; Lu, F.; Lynch, W. G.; Shane, R.; Tsang, M. B.; McIntosh, A. B.; Yenello, S. J.; Famiano, M.; Isobe, T.; Sakurai, H.; Taketani, A.; Murakami, T.; Samurai-Tpc Collaboration

    2011-10-01

    The SAMURAI TPC is being built at Michigan State University to be used in the SAMURAI spectrometer at RIKEN in Japan, as part of the Symmetry Energy project, which focuses on obtaining constraints on the symmetry energy at supra-saturation densities. The presentation will discuss the development of the TPC as well as design for readout plane design for the TPC. These involve enabling the use of existing and future front end electronics (FEE), making the most of limited space, designing a circuit board for the pad plane, and techniques to glue the pad plane. The pad plane has been designed to work with either STAR or AGET electronics. The pad plane is made of a circuit board designed to minimize crosstalk and capacitance. The board must be built in smaller pieces and tiled, using alignment pins and precision gluing. Prototypes for the pad plane to FEE connection, pad plane gluing and STAR card mounting will be presented. Supported by the Department of Energy under Grant DE-SC0004835.

  3. Materials Testing and Performance Optimization for the SAMURAI-TPC

    Science.gov (United States)

    Long, K. D.; Lynch, W. G.; Barney, J.; Chajecki, Z.; Estee, J.; Shane, R.; Tangwanchareon, S.; Tsang, M. B.; Yurkon, J.

    2012-10-01

    The SAMURAI time-projection chamber (TPC) will be used to make measurements of pion spectra from heavy ion collisions at RIBF in Japan. Such research provides an opportunity to study supra-saturation density neutron-rich matter in the laboratory, and is critical to understanding the structure of neutron stars. It will provide a complete, 3D picture of the ionization deposited in a gas volume, from which particle types and momenta can be determined. The gas-containment volume is composed of surfaces of aluminum and plastic, as well as halogen-free printed circuit board. During multiplication of the ionized electrons at the anode wire plane of the TPC, UV photons are produced. These cause unwanted discharges when they interact with oxidized aluminum surfaces, which have low work functions. This problem can be addressed by application of a suitable conductive paint or epoxy. Paints were investigated to insure they did not contain any materials capable of inhibiting the performance of the detector gas. These investigations were cross-checked by tests carried out using an existing BRAHMS-TPC. Details on these tests and the materials chosen will be shown. The design and optimization of the gating grid, used to limit data collection to triggered events, will also be discussed.

  4. Slow Control System for the NIFFTE Collaboration TPC

    Science.gov (United States)

    Ringle, Erik; Niffte Collaboration Collaboration

    2011-10-01

    As world energy concerns continue to dominate public policy in the 21st century, the need for cleaner and more efficient nuclear power is necessary. In order to effectively design and implement plans for generation IV nuclear reactors, more accurate fission cross-section measurements are necessary. The Neutron Induced Fission Fragment Tracking Experiment (NIFFTE) collaboration, in an effort to meet this need, has constructed a Time Projection Chamber (TPC) which aims to reduce the uncertainty of the fission cross-section to less than 1%. Using the Maximum Integration Data Acquisition System (MIDAS) framework, slow control measurements are integrated into a single interface to facilitate off-site monitoring. The Hart Scientific 1560 Black Stack will be used with two 2564 Thermistor Scanner Modules to monitor internal temperature of the TPC. A Prologix GPIB to Ethernet controller will be used to interface the hardware with MIDAS. This presentation will detail the design and implementation of the slow control system for the TPC. This work was supported by the U.S. Department of Energy Division of Energy Research.

  5. Methods and results for calibration and track separation of a GEM based TPC using an UV-laser

    Energy Technology Data Exchange (ETDEWEB)

    Ball, Markus

    2008-12-15

    In the last 30 years high energy physics could write an impressive story of success. Since the introduction of the Standard Model (SM), it has met every experimental test. However the final confirmation has to prove the mechanism of electroweak symmetry breaking, which could not be confirmed yet. The most favored theory, which includes the introduction of a Higgs field, could not be verified experimentally. Furthermore there is clear evidence, that the SM is only a low energy description of nature and its principles, as the SM describes only 4 % of the known matter in the universe. There are two different approaches in accelerator driven high energy physics to clarify the open questions. The Large Hadron Collider (LHC) have a good opportunity to measure some of the missing pieces with its high center of mass energy. The International Linear Collider (ILC) will then measure their parameters with high precision. To guarantee this high precision the detectors have to be able to identify every single particle and determine its properties with high accuracy. These high requirements to the single detectors as well as the interconnectivity between all detectors are summarised by the concept of particle flow (PFLOW). This means that all particles must be separable, which includes in particular the main tracking device. A possible candidate for the central tracking device is a Time Projection Chamber (TPC). In this work a TPC with Gas Electron Multipliers (GEM) as gas amplification system was used. The GEMs replace the conventional wire amplification system of the TPC. In this PhD work a method to determine the drift velocity of a TPC was developed and tested using an ultraviolet laser. To ensure a high accuracy of the method all relevant gas parameters were measured with a slow control system. Furthermore the laser was used to investigate the separation capability of nearby tracks. Therefore an existing TPC prototype, which was developed to operate in a 5 T magnet facility

  6. Heavy ion physics with the ALICE experiment at LHC

    CERN Document Server

    Zampolli, Chiara

    2007-01-01

    ALICE is the experiment at the LHC collider at CERN dedicated to heavy ion physics. In this report, the ALICE detector will be presented, together with its expected performance as far as some selected physics topics are concerned.

  7. European Researchers Night, Students on Shift at ALICE

    CERN Multimedia

    Fons Rademakers

    2010-01-01

    During European Researchers' Night, on Friday 24 September 2010, from 17:00 to 24:00, pupils from French and Swiss schools visited ALICE and took shifts in the control room, helping the ALICE physicists run the experiment.

  8. Triggering with the ALICE TRD

    CERN Document Server

    Klein, Jochen

    2011-01-01

    We discuss how a level-1 trigger, about 8 us after a hadron-hadron collision, can be derived from the Transition Radiation Detector (TRD) in A Large Ion Collider Experiment (ALICE) at the LHC. Chamber-wise track segments from fast on-detector reconstruction are read out with position, angle and electron likelihood. In the Global Tracking Unit up to 6 tracklets from a particle traversing the detector layers are matched and used for the reconstruction of transverse momentum and electron identification. Such tracks form the basis for versatile and flexible trigger conditions, e.g. single high-pt hadron, single high-pt electron, di-electron (J/Psi, Upsilon) and at least n close high-pt tracks (jet). The need for low-latency on-line reconstruction poses challenges on the detector operation. The calibration for gain (pad-by-pad) and drift velocity must be applied already in the front-end electronics. Due to changes in pressure and gas composition an on-line monitoring and feedback loop for these parameters is requi...

  9. Through the Looking Glass and What Alice Ate There.

    Science.gov (United States)

    Yee, Gordon T.

    2002-01-01

    In the book, 'Through the Looking Glass and What Alice Found There', Alice walks through a mirror into a mirror-image world. Assuming that she is not changed by this transition, her enzymes are still only capable of processing molecules of the handedness of her native world. So the question is, what can Alice eat in the mirror-image world that…

  10. Performance of the ALICE VZERO system

    CERN Document Server

    Abbas, E.; Adam, J.; Adamova, D.; Adare, A.M.; Aggarwal, M.M.; Aglieri Rinella, G.; Agnello, M.; Agocs, A.G.; Agostinelli, A.; Ahammed, Z.; Ahmad, N.; Masoodi, A.Ahmad; Ahmed, I.; Ahn, S.A.; Ahn, S.U.; Aimo, I.; Ajaz, M.; Akindinov, A.; Aleksandrov, D.; Alessandro, B.; Alexandre, D.; Molina, R.Alfaro; Alici, A.; Alkin, A.; Almaraz Avina, E.; Alme, J.; Alt, T.; Altini, V.; Altinpinar, S.; Altsybeev, I.; Andrei, C.; Andronic, A.; Anguelov, V.; Anielski, J.; Anson, C.; Anticic, T.; Antinori, F.; Antonioli, P.; Aphecetche, L.; Appelshauser, H.; Arbor, N.; Arcelli, S.; Arend, A.; Armesto, N.; Arnaldi, R.; Aronsson, T.; Arsene, I.C.; Arslandok, M.; Asryan, A.; Augustinus, A.; Averbeck, R.; Awes, T.C.; Aysto, J.; Azmi, M.D.; Bach, M.; Badala, A.; Baek, Y.W.; Bailhache, R.; Bala, R.; Baldisseri, A.; Baltasar Dos Santos Pedrosa, F.; Ban, J.; Baral, R.C.; Barbera, R.; Barile, F.; Barnafoldi, G.G.; Barnby, L.S.; Barret, V.; Bartke, J.; Basile, M.; Bastid, N.; Basu, S.; Bathen, B.; Batigne, G.; Batyunya, B.; Batzing, P.C.; Baumann, C.; Bearden, I.G.; Beck, H.; Behera, N.K.; Belikov, I.; Bellini, F.; Bellwied, R.; Belmont-Moreno, E.; Bencedi, G.; Beole, S.; Berceanu, I.; Bercuci, A.; Berdnikov, Y.; Berenyi, D.; Bergognon, A.A.E.; Bertens, R.A.; Berzano, D.; Betev, L.; Bhasin, A.; Bhati, A.K.; Bhom, J.; Bianchi, L.; Bianchi, N.; Bianchin, C.; Bielcik, J.; Bielcikova, J.; Bilandzic, A.; Bjelogrlic, S.; Blanco, F.; Blanco, F.; Blau, D.; Blume, C.; Boccioli, M.; Bottger, S.; Bogdanov, A.; Boggild, H.; Bogolyubsky, M.; Boldizsar, L.; Bombara, M.; Book, J.; Borel, H.; Borissov, A.; Bossu, F.; Botje, M.; Botta, E.; Braidot, E.; Braun-Munzinger, P.; Bregant, M.; Breitner, T.; Broker, T.A.; Browning, T.A.; Broz, M.; Brun, R.; Bruna, E.; Bruno, G.E.; Budnikov, D.; Buesching, H.; Bufalino, S.; Buncic, P.; Busch, O.; Buthelezi, Z.; Caffarri, D.; Cai, X.; Caines, H.; Calvo Villar, E.; Camerini, P.; Canoa Roman, V.; Cara Romeo, G.; Carena, W.; Carena, F.; Carlin Filho, N.; Carminati, F.; Casanova Diaz, A.; Castillo Castellanos, J.; Castillo Hernandez, J.F.; Casula, E.A.R.; Catanescu, V.; Cavicchioli, C.; Ceballos Sanchez, C.; Cepila, J.; Cerello, P.; Chang, B.; Chapeland, S.; Charvet, J.L.; Chattopadhyay, S.; Chattopadhyay, S.; Cherney, M.; Cheshkov, C.; Cheynis, B.; Chibante Barroso, V.; Chinellato, D.D.; Chochula, P.; Chojnacki, M.; Choudhury, S.; Christakoglou, P.; Christensen, C.H.; Christiansen, P.; Chujo, T.; Chung, S.U.; Cicalo, C.; Cifarelli, L.; Cindolo, F.; Cleymans, J.; Colamaria, F.; Colella, D.; Collu, A.; Conesa Balbastre, G.; Conesa del Valle, Z.; Connors, M.E.; Contin, G.; Contreras, J.G.; Cormier, T.M.; Corrales Morales, Y.; Cortese, P.; Cortes Maldonado, I.; Cosentino, M.R.; Costa, F.; Cotallo, M.E.; Crescio, E.; Crochet, P.; Alaniz, E.Cruz; Albino, R.Cruz; Cuautle, E.; Cunqueiro, L.; Dainese, A.; Dang, R.; Danu, A.; Das, K.; Das, I.; Das, S.; Das, D.; Dash, S.; Dash, A.; De, S.; de Barros, G.O.V.; De Caro, A.; De Cataldo, G.; de Cuveland, J.; De Falco, A.; De Gruttola, D.; Delagrange, H.; Deloff, A.; De Marco, N.; Denes, E.; De Pasquale, S.; Deppman, A.; Erasmo, G.D.; de Rooij, R.; Diaz Corchero, M.A.; Di Bari, D.; Dietel, T.; Di Giglio, C.; Di Liberto, S.; Di Mauro, A.; Di Nezza, P.; Divia, R.; Djuvsland, O.; Dobrin, A.; Dobrowolski, T.; Donigus, B.; Dordic, O.; Dubey, A.K.; Dubla, A.; Ducroux, L.; Dupieux, P.; Dutta Majumdar, A.K.; Elia, D.; Emschermann, D.; Engel, H.; Erazmus, B.; Erdal, H.A.; Eschweiler, D.; Espagnon, B.; Estienne, M.; Esumi, S.; Evans, D.; Evdokimov, S.; Eyyubova, G.; Fabris, D.; Faivre, J.; Falchieri, D.; Fantoni, A.; Fasel, M.; Fehlker, D.; Feldkamp, L.; Felea, D.; Feliciello, A.; Fenton-Olsen, B.; Feofilov, G.; Fernandez Tellez, A.; Ferretti, A.; Festanti, A.; Figiel, J.; Figueredo, M.A.S.; Filchagin, S.; Finogeev, D.; Fionda, F.M.; Fiore, E.M.; Floratos, E.; Floris, M.; Foertsch, S.; Foka, P.; Fokin, S.; Fragiacomo, E.; Francescon, A.; Frankenfeld, U.; Fuchs, U.; Furget, C.; Fusco Girard, M.; Gaardhoje, J.J.; Gagliardi, M.; Gago, A.; Gallio, M.; Gangadharan, D.R.; Ganoti, P.; Garabatos, C.; Garcia-Solis, E.; Gargiulo, C.; Garishvili, I.; Gerhard, J.; Germain, M.; Geuna, C.; Gheata, M.; Gheata, A.; Ghidini, B.; Ghosh, P.; Gianotti, P.; Giubellino, P.; Gladysz-Dziadus, E.; Glassel, P.; Gomez, R.; Ferreiro, E.G.; Gonzalez-Trueba, L.H.; Gonzalez-Zamora, P.; Gorbunov, S.; Goswami, A.; Gotovac, S.; Grabski, V.; Graczykowski, L.K.; Grajcarek, R.; Grelli, A.; Grigoras, C.; Grigoras, A.; Grigoriev, V.; Grigoryan, A.; Grigoryan, S.; Grinyov, B.; Grion, N.; Gros, P.; Grosse-Oetringhaus, J.F.; Grossiord, J.Y.; Grosso, R.; Guber, F.; Guernane, R.; Guerzoni, B.; Guilbaud, M.; Gulbrandsen, K.; Gulkanyan, H.; Gunji, T.; Gupta, A.; Gupta, R.; Haake, R.; Haaland, O.; Hadjidakis, C.; Haiduc, M.; Hamagaki, H.; Hamar, G.; Han, B.H.; Hanratty, L.D.; Hansen, A.; Harmanova-Tothova, Z.; Harris, J.W.; Hartig, M.; Harton, A.; Hatzifotiadou, D.; Hayashi, S.; Hayrapetyan, A.; Heckel, S.T.; Heide, M.; Helstrup, H.; Herghelegiu, A.; Herrera Corral, G.; Herrmann, N.; Hess, B.A.; Hetland, K.F.; Hicks, B.; Hippolyte, B.; Hori, Y.; Hristov, P.; Hrivnacova, I.; Huang, M.; Humanic, T.J.; Hwang, D.S.; Ichou, R.; Ilkaev, R.; Ilkiv, I.; Inaba, M.; Incani, E.; Innocenti, G.M.; Innocenti, P.G.; Ippolitov, M.; Irfan, M.; Ivan, C.; Ivanov, M.; Ivanov, A.; Ivanov, V.; Ivanytskyi, O.; Jacholkowski, A.; Jacobs, P.M.; Jahnke, C.; Jang, H.J.; Janik, M.A.; Jayarathna, P.H.S.Y.; Jena, S.; Jha, D.M.; Jimenez Bustamante, R.T.; Jones, P.G.; Jung, H.; Jusko, A.; Kaidalov, A.B.; Kalcher, S.; Kalinak, P.; Kalliokoski, T.; Kalweit, A.; Kang, J.H.; Kaplin, V.; Kar, S.; Karasu Uysal, A.; Karavichev, O.; Karavicheva, T.; Karpechev, E.; Kazantsev, A.; Kebschull, U.; Keidel, R.; Ketzer, B.; Khan, M.M.; Khan, P.; Khan, S.A.; Khan, K.H.; Khanzadeev, A.; Kharlov, Y.; Kileng, B.; Kim, M.; Kim, T.; Kim, B.; Kim, S.; Kim, M.; Kim, D.J.; Kim, J.S.; Kim, J.H.; Kim, D.W.; Kirsch, S.; Kisel, I.; Kiselev, S.; Kisiel, A.; Klay, J.L.; Klein, J.; Klein-Bosing, C.; Kliemant, M.; Kluge, A.; Knichel, M.L.; Knospe, A.G.; Kohler, M.K.; Kollegger, T.; Kolojvari, A.; Kompaniets, M.; Kondratiev, V.; Kondratyeva, N.; Konevskikh, A.; Kovalenko, V.; Kowalski, M.; Kox, S.; Koyithatta Meethaleveedu, G.; Kral, J.; Kralik, I.; Kramer, F.; Kravcakova, A.; Krelina, M.; Kretz, M.; Krivda, M.; Krizek, F.; Krus, M.; Kryshen, E.; Krzewicki, M.; Kucera, V.; Kucheriaev, Y.; Kugathasan, T.; Kuhn, C.; Kuijer, P.G.; Kulakov, I.; Kumar, J.; Kurashvili, P.; Kurepin, A.; Kurepin, A.B.; Kuryakin, A.; Kushpil, V.; Kushpil, S.; Kvaerno, H.; Kweon, M.J.; Kwon, Y.; Ladron de Guevara, P.; Lagana Fernandes, C.; Lakomov, I.; Langoy, R.; La Pointe, S.L.; Lara, C.; Lardeux, A.; La Rocca, P.; Lea, R.; Lechman, M.; Lee, S.C.; Lee, G.R.; Legrand, I.; Lehnert, J.; Lemmon, R.C.; Lenhardt, M.; Lenti, V.; Leon, H.; Leoncino, M.; Leon Monzon, I.; Levai, P.; Li, S.; Lien, J.; Lietava, R.; Lindal, S.; Lindenstruth, V.; Lippmann, C.; Lisa, M.A.; Ljunggren, H.M.; Lodato, D.F.; Loenne, P.I.; Loggins, V.R.; Loginov, V.; Lohner, D.; Loizides, C.; Loo, K.K.; Lopez, X.; Lopez Torres, E.; Lovhoiden, G.; Lu, X.G.; Luettig, P.; Lunardon, M.; Luo, J.; Luparello, G.; Luzzi, C.; Ma, R.; Ma, K.; Madagodahettige-Don, D.M.; Maevskaya, A.; Mager, M.; Mahapatra, D.P.; Maire, A.; Malaev, M.; Maldonado Cervantes, I.; Malinina, L.; Mal'Kevich, D.; Malzacher, P.; Mamonov, A.; Manceau, L.; Mangotra, L.; Manko, V.; Manso, F.; Manzari, V.; Mao, Y.; Marchisone, M.; Mares, J.; Margagliotti, G.V.; Margotti, A.; Marin, A.; Markert, C.; Marquard, M.; Martashvili, I.; Martin, N.A.; Martinengo, P.; Martinez, M.I.; Martinez Garcia, G.; Martynov, Y.; Mas, A.; Masciocchi, S.; Masera, M.; Masoni, A.; Massacrier, L.; Mastroserio, A.; Matyja, A.; Mayer, C.; Mazer, J.; Mazumder, R.; Mazzoni, M.A.; Meddi, F.; Menchaca-Rocha, A.; Mercado Perez, J.; Meres, M.; Miake, Y.; Mikhaylov, K.; Milano, L.; Milosevic, J.; Mischke, A.; Mishra, A.N.; Miskowiec, D.; Mitu, C.; Mizuno, S.; Mlynarz, J.; Mohanty, B.; Molnar, L.; Montano Zetina, L.; Monteno, M.; Montes, E.; Moon, T.; Morando, M.; Moreira De Godoy, D.A.; Moretto, S.; Morreale, A.; Morsch, A.; Muccifora, V.; Mudnic, E.; Muhuri, S.; Mukherjee, M.; Muller, H.; Munhoz, M.G.; Murray, S.; Musa, L.; Musinsky, J.; Nandi, B.K.; Nania, R.; Nappi, E.; Nattrass, C.; Nayak, T.K.; Nazarenko, S.; Nedosekin, A.; Nicassio, M.; Niculescu, M.; Nielsen, B.S.; Niida, T.; Nikolaev, S.; Nikolic, V.; Nikulin, S.; Nikulin, V.; Nilsen, B.S.; Nilsson, M.S.; Noferini, F.; Nomokonov, P.; Nooren, G.; Nyanin, A.; Nyatha, A.; Nygaard, C.; Nystrand, J.; Ochirov, A.; Oeschler, H.; Oh, S.; Oh, S.K.; Oleniacz, J.; Da Silva, A.C. Oliveira; Onderwaater, J.; Oppedisano, C.; Ortiz Velasquez, A.; Oskarsson, A.; Ostrowski, P.; Otwinowski, J.; Oyama, K.; Ozawa, K.; Pachmayer, Y.; Pachr, M.; Padilla, F.; Pagano, P.; Paic, G.; Painke, F.; Pajares, C.; Pal, S.K.; Palaha, A.; Palmeri, A.; Papikyan, V.; Pappalardo, G.S.; Park, W.J.; Passfeld, A.; Patalakha, D.I.; Paticchio, V.; Paul, B.; Pavlinov, A.; Pawlak, T.; Peitzmann, T.; Pereira Da Costa, H.; Pereira De Oliveira Filho, E.; Peresunko, D.; Perez Lara, C.E.; Perrino, D.; Peryt, W.; Pesci, A.; Pestov, Y.; Petracek, V.; Petran, M.; Petris, M.; Petrov, P.; Petrovici, M.; Petta, C.; Piano, S.; Pikna, M.; Pillot, P.; Pinazza, O.; Pinsky, L.; Pitz, N.; Piyarathna, D.B.; Planinic, M.; Ploskon, M.; Pluta, J.; Pocheptsov, T.; Pochybova, S.; Podesta-Lerma, P.L.M.; Poghosyan, M.G.; Polak, K.; Polichtchouk, B.; Poljak, N.; Pop, A.; Porteboeuf-Houssais, S.; Pospisil, V.; Potukuchi, B.; Prasad, S.K.; Preghenella, R.; Prino, F.; Pruneau, C.A.; Pshenichnov, I.; Puddu, G.; Punin, V.; Putschke, J.; Qvigstad, H.; Rachevski, A.; Rademakers, A.; Raiha, T.S.; Rak, J.; Rakotozafindrabe, A.; Ramello, L.; Raniwala, S.; Raniwala, R.; Rasanen, S.S.; Rascanu, B.T.; Rathee, D.; Rauch, W.; Rauf, A.W.; Razazi, V.; Read, K.F.; Real, J.S.; Redlich, K.; Reed, R.J.; Rehman, A.; Reichelt, P.; Reicher, M.; Reidt, F.; Renfordt, R.; Reolon, A.R.; Reshetin, A.; Rettig, F.; Revol, J.P.; Reygers, K.; Riccati, L.; Ricci, R.A.; Richert, T.; Richter, M.; Riedler, P.; Riegler, W.; Riggi, F.; Rivetti, A.; Rodriguez Cahuantzi, M.; Rodriguez Manso, A.; Roed, K.; Rogochaya, E.; Rohr, D.; Rohrich, D.; Romita, R.; Ronchetti, F.; Rosnet, P.; Rossegger, S.; Rossi, A.; Roy, P.; Roy, C.; Rubio Montero, A.J.; Rui, R.; Russo, R.; Ryabinkin, E.; Rybicki, A.; Sadovsky, S.; Safarik, K.; Sahoo, R.; Sahu, P.K.; Saini, J.; Sakaguchi, H.; Sakai, S.; Sakata, D.; Salgado, C.A.; Salzwedel, J.; Sambyal, S.; Samsonov, V.; Sanchez Castro, X.; Sandor, L.; Sandoval, A.; Sano, M.; Santagati, G.; Santoro, R.; Sarkamo, J.; Sarkar, D.; Scapparone, E.; Scarlassara, F.; Scharenberg, R.P.; Schiaua, C.; Schicker, R.; Schmidt, H.R.; Schmidt, C.; Schuchmann, S.; Schukraft, J.; Schuster, T.; Schutz, Y.; Schwarz, K.; Schweda, K.; Scioli, G.; Scomparin, E.; Scott, R.; Scott, P.A.; Segato, G.; Selyuzhenkov, I.; Senyukov, S.; Seo, J.; Serci, S.; Serradilla, E.; Sevcenco, A.; Shabetai, A.; Shabratova, G.; Shahoyan, R.; Sharma, S.; Sharma, N.; Rohni, S.; Shigaki, K.; Shtejer, K.; Sibiriak, Y.; Sicking, E.; Siddhanta, S.; Siemiarczuk, T.; Silvermyr, D.; Silvestre, C.; Simatovic, G.; Simonetti, G.; Singaraju, R.; Singh, R.; Singha, S.; Singhal, V.; Sinha, T.; Sinha, B.C.; Sitar, B.; Sitta, M.; Skaali, T.B.; Skjerdal, K.; Smakal, R.; Smirnov, N.; Snellings, R.J.M.; Sogaard, C.; Soltz, R.; Song, M.; Song, J.; Soos, C.; Soramel, F.; Sputowska, I.; Spyropoulou-Stassinaki, M.; Srivastava, B.K.; Stachel, J.; Stan, I.; Stefanek, G.; Steinpreis, M.; Stenlund, E.; Steyn, G.; Stiller, J.H.; Stocco, D.; Stolpovskiy, M.; Strmen, P.; Suaide, A.A.P.; Subieta Vasquez, M.A.; Sugitate, T.; Suire, C.; Suleymanov, M.; Sultanov, R.; Sumbera, M.; Susa, T.; Symons, T.J.M.; Szanto de Toledo, A.; Szarka, I.; Szczepankiewicz, A.; Szymanski, M.; Takahashi, J.; Tangaro, M.A.; J.Tapia Takaki, D.; Peloni, A.Tarantola; Tarazona Martinez, A.; Tauro, A.; Tejeda Munoz, G.; Telesca, A.; Ter Minasyan, A.; Terrevoli, C.; Thader, J.; Thomas, D.; Tieulent, R.; Timmins, A.R.; Tlusty, D.; Toia, A.; Torii, H.; Toscano, L.; Trubnikov, V.; Truesdale, D.; Trzaska, W.H.; Tsuji, T.; Tumkin, A.; Turrisi, R.; Tveter, T.S.; Ulery, J.; Ullaland, K.; Ulrich, J.; Uras, A.; Urciuoli, G.M.; Usai, G.L.; Vajzer, M.; Vala, M.; Valencia Palomo, L.; Vallero, S.; Vande Vyvre, P.; Van Hoorne, J.W.; van Leeuwen, M.; Vannucci, L.; Vargas, A.; Varma, R.; Vasileiou, M.; Vasiliev, A.; Vechernin, V.; Veldhoen, M.; Venaruzzo, M.; Vercellin, E.; Vergara, S.; Vernet, R.; Verweij, M.; Vickovic, L.; Viesti, G.; Viinikainen, J.; Vilakazi, Z.; Villalobos Baillie, O.; Vinogradov, Y.; Vinogradov, L.; Vinogradov, A.; Virgili, T.; Viyogi, Y.P.; Vodopyanov, A.; Volkl, M.A.; Voloshin, S.; Voloshin, K.; Volpe, G.; von Haller, B.; Vorobyev, I.; Vranic, D.; Vrlakova, J.; Vulpescu, B.; Vyushin, A.; Wagner, V.; Wagner, B.; Wan, R.; Wang, Y.; Wang, Y.; Wang, M.; Watanabe, K.; Weber, M.; Wessels, J.P.; Westerhoff, U.; Wiechula, J.; Wikne, J.; Wilde, M.; Wilk, G.; Williams, M.C.S.; Windelband, B.; Winn, M.; Yaldo, C.G.; Yamaguchi, Y.; Yang, S.; Yang, P.; Yang, H.; Yasnopolskiy, S.; Yi, J.; Yin, Z.; Yoo, I.K.; Yoon, J.; Yuan, X.; Yushmanov, I.; Zaccolo, V.; Zach, C.; Zampolli, C.; Zaporozhets, S.; Zarochentsev, A.; Zavada, P.; Zaviyalov, N.; Zbroszczyk, H.; Zelnicek, P.; Zgura, I.S.; Zhalov, M.; Zhang, Y.; Zhang, H.; Zhang, X.; Zhou, D.; Zhou, Y.; Zhou, F.; Zhu, H.; Zhu, J.; Zhu, X.; Zichichi, A.; Zimmermann, A.; Zinovjev, G.; Zoccarato, Y.; Zynovyev, M.; Zyzak, M.

    2013-01-01

    ALICE is an LHC experiment devoted to the study of strongly interacting matter in proton--proton, proton--nucleus and nucleus--nucleus collisions at ultra-relativistic energies. The ALICE VZERO system, made of two scintillator arrays at asymmetric positions, one on each side of the interaction point, plays a central role in ALICE. In addition to its core function as a trigger, the VZERO system is used to monitor LHC beam conditions, to reject beam-induced backgrounds and to measure basic physics quantities such as luminosity, particle multiplicity, centrality and event plane direction in nucleus--nucleus collisions. After describing the VZERO system, this publication presents its performance over more than four years of operation at the LHC.

  11. ALICE gives its first thesis awards

    CERN Multimedia

    2008-01-01

    For the first time the ALICE collaboration has given two of its doctoral students awards for their outstanding theses. Winners Christian Holm Christensen and Zaida Conesa del Valle holding their awards.On 29 October the ALICE collaboration honoured two students for their outstanding theses at a ceremony held at CERN. The two awards, one of which was given for a physics thesis and the other for a technical thesis, went to Zaida Conesa Del Valle (Laboratoire de physique subatomique et des technologies associées) and Christian Holm Christensen (Niels Bohr Institute) respectively. "It is very gratifying to see that the collaboration appreciates our work," said Zaida Conesa del Valle, winner of the physics award for her thesis: Performance of the ALICE Muon Spectrometer. Weak Boson Production and Measurement in Heavy Ion Collisions at the LHC. "I also feel specially thankful to all the people who worked with me," she added. "It was pl...

  12. The GridKa Tier-1 Computing Center within the ALICE Grid Framework

    Science.gov (United States)

    Park, WooJin J.; Christopher, Jung; Heiss, Andreas; Petzold, Andreas; Schwarz, Kilian

    2014-06-01

    The GridKa computing center, hosted by Steinbuch Centre for Computing at the Karlsruhe Institute for Technology (KIT) in Germany, is serving as the largest Tier-1 center used by the ALICE collaboration at the LHC. In 2013, GridKa provides 30k HEPSPEC06, 2.7 PB of disk space, and 5.25 PB of tape storage to ALICE. The 10Gbit/s network connections from GridKa to CERN, several Tier-1 centers and the general purpose network are used by ALICE intensively. In 2012 a total amount of ~1 PB was transferred to and from GridKa. As Grid framework, AliEn (ALICE Environment) is being used to access the resources, and various monitoring tools including the MonALISA (MONitoring Agent using a Large Integrated Services Architecture) are always running to alert in case of any problem. GridKa on-call engineers provide 24/7 support to guarantee minimal loss of availability of computing and storage resources in case of hardware or software problems. We introduce the GridKa Tier-1 center from the viewpoint of ALICE services.

  13. Crew participating in the ALICE TRD beamtests

    CERN Multimedia

    Maximilien Brice

    2002-01-01

    Photo 1: Sitting in front of the experimental setup is part of the crew participating in the ALICE TRD beamtests at pion/electron secondary beams at CERN Proton Synchrotron in October 2002. From left to right: Mircea Ciobanu, Andres Sandoval, Vojtech Petracek, Oliver Busch, Chilo Garabatos, Wilrid Ludolphs and Harald Appelshaeuser. photo 2: Two fierce experimental physicists, Chilo Garabatos (left) and Anton Andronic, guarding their most valuable asset: Transition Radiation Detector prototypes for the ALICE experiment. These detectors are tested in electron/pion secondary beams at CERN Proton Synchrotron.

  14. AliEn - EDG Interoperability in ALICE

    OpenAIRE

    Bagnasco, S.; Barbera, R; Buncic, P.; Carminati, F.; Cerello, P.; Saiz, P.

    2003-01-01

    AliEn (ALICE Environment) is a GRID-like system for large scale job submission and distributed data management developed and used in the context of ALICE, the CERN LHC heavy-ion experiment. With the aim of exploiting upcoming Grid resources to run AliEn-managed jobs and store the produced data, the problem of AliEn-EDG interoperability was addressed and an in-terface was designed. One or more EDG (European Data Grid) User Interface machines run the AliEn software suite (Cluster Monitor, Stora...

  15. SAMURAI-TPC: Field Cage Design and Prototyping

    Science.gov (United States)

    Lu, F.; Barney, J.; Chajecki, Z.; Chan, C. F.; Dunn, J. W.; Estee, J.; Gilbert, J.; Lynch, W. G.; Shane, R.; Tsang, M. B.; McIntosh, A. B.; Yenello, S. J.; Famiano, M.; Isobe, T.; Sakurai, H.; Taketani, A.; Murakami, T.; Samurai-Tpc Collaboration

    2011-10-01

    The SAMURAI-TPC is a time-projection chamber to be used in conjunction with the SAMURAI spectrometer being built at the Radioactive Isotope Beam Facility at RIKEN, Japan. It will be used to measure charged pions, protons and light ions. The pi+/pi- ratios from heavy-ion collisions should provide constraints on the asymmetry term in the nuclear equation of state at densities about twice saturation density. In this talk, the design and operation of the field cage, an essential part of the detector, will be discussed, along with the results of prototype testing. This work is supported by the Department of Energy under Grant DE-SC0004835.

  16. Electron transmission efficiency of gating-GEM foil for TPC

    Institute of Scientific and Technical Information of China (English)

    XIE Wen-Qing; HUANG Meng; LI Ting; TIAN Yang; LI Yu-Lan; LI Yuan-Jing

    2012-01-01

    In a TPC,ion feedback from the readout detector can cause a space-charge effect and distort the electrical field in the drift region.Gating is one of the effective methods to solve this problem,which can block ions at the expense of losing a certain amount of primary electrons.Compared with the traditional design with a wire structure,gating based on GEM foil is more attractive because of its simplicity.In this paper,the factors influencing the electron transmission efficiency are studied with simulations and experiments.After optimizing all these parameters,an electron transmission efficiency over 80% is obtained.

  17. The ALICE Silicon Pixel Detector System

    CERN Document Server

    Fadmar Osmic, FO

    2006-01-01

    The European Organization for Particle Physics (CERN) in Geneva is currently constructing the Large Hadron Collider (LHC), which will allow the study of the subnuclear ranges of physics with an accuracy never achieved before. Within the LHC project, ALICE is to the study of strongly interacting matter at extreme densities and high temperatures. ALICE as many other modern High Energy Physics (HEP) experiments uses silicon pixel detectors for tracking close to the interaction point (IP). The ALICE Silicon Pixel Detector (SPD) will constitute the two innermost layers of ALICE, and will due to its high granularity provide precise tracking information. In heavy ion collisions, the track density could be as high as 80 tracks/cm2 in the first SPD layer. The SPD will provide tracking information at radii of 3.9 and 7.6 cm from the IP. It is a fundamental element for the study of the weak decays of the particles carrying heavy flavour, whose typical signature will be a secondary vertex separated from the primary verte...

  18. Gender roles for Alice and Bob

    Science.gov (United States)

    Harris, Philip

    2013-04-01

    As the head of a department that is striving to achieve bronze status under the Athena SWAN (Scientific Women's Academic Network) programme, I have become extremely sensitive to gender stereotyping, and I am afraid that the "Alice and Bob" image on the cover of your March issue on quantum frontiers set off some alarm bells.

  19. Fibre optic cables for the ALICE experiment

    CERN Multimedia

    Maximilien Brice

    2003-01-01

    These thin fibres will transmit the signal received in detectors at the ALICE experiment when it starts up with the LHC in 2008. The analogue signals produced in the detectors are first converted into digital pulse, which are transported in light down such fibres. Computers then read this digital signal to produce the final set of data.

  20. The ALICE experiment at the CERN LHC

    NARCIS (Netherlands)

    Aamodt, K.; de Haas, A.P.; Grebenyuk, O.; Ivan, C.G.; Kamermans, R.; Mischke, A.; Nooren, G.J.L.; Oskamp, C.J.; Peitzmann, T.; Simili, E.; van den Brink, A.; van Eijndhoven, N.J.A.M.; Yuting, B.

    2008-01-01

    ALICE (A Large Ion Collider Experiment) is a general-purpose, heavy-ion detector at the CERN LHC which focuses on QCD, the strong-interaction sector of the Standard Model. It is designed to address the physics of strongly interacting matter and the quark-gluon plasma at extreme values of energy dens

  1. Development of ALICE microstrip detectors at IRST

    CERN Document Server

    Boscardin, M; Dalla Betta, Gian Franco; Gregori, P; Rachevskaia, I; Zorzi, N

    2001-01-01

    We report on the development of double-sided, AC-coupled, microstrip detectors oriented to the A Large Ion Collider Experiment (ALICE). The main design and processing issues are presented, together with some selected results from the electrical characterization of detectors and related test structures. (3 refs).

  2. ALICE physicists receive 2014 Lise Meitner Prize

    CERN Multimedia

    Jeanneret, Guillaume

    2014-01-01

    September 3rd, 2014: ALICE collaboration members Johanna Stachel (Heidelberg University, Germany), Peter Braun-Munzinger (GSI, Germany), Paolo Giubellino (INFN Turin, Italy, and CERN) and Jürgen Schukraft (CERN) were presented the 2014 Lise Meitner Prize at a private ceremony held in the Globe of Science and Innovation.

  3. ALICE Transition Radiation Detector (TRD), test beam.

    CERN Multimedia

    2003-01-01

    Electrons and positrons can be discriminated from other charged particles using the emission of transition radiation - X-rays emitted when the particles cross many layers of thin materials. To develop such a Transition Radiation Detector(TRD) for ALICE many detector prototypes were tested in mixed beams of pions and electrons, as in the example shown here.

  4. Round Two for Three ALICE Industrial Awards

    CERN Multimedia

    2004-01-01

    Excellency in industrial collaboration with the LHC experimental teams is one important contribution to the successful development and realization of the experiments. A few weeks ago the ALICE collaboration presented a second round of awards to industrial collaborators for their novel and remarkable contributions to major detector systems.

  5. Strangeness detection in ALICE experiment at LHC

    Energy Technology Data Exchange (ETDEWEB)

    Safarik, K. [European Lab. for Particle Physics, Geneva (Switzerland)

    1995-07-15

    The authors present some parameters of the ALICE detector which concern the detection of strange particles. The results of a simulation for neutral strange particles and cascades, together with estimated rates are presented. They also briefly discuss the detection of charged K-mesons. Finally, they mention the possibility of open charm particle detection.

  6. Cold Electronics Development for the LBNE LAr TPC

    Science.gov (United States)

    Thorn, C.; De Geronimo, Gianluigi; D'Andragora, Alessio; Li, Shaorui; Nambiar, Neena; Rescia, Sergio; Vernon, Emerson; Chen, Hucheng; Lanni, Francesco; Makowiecki, Don; Radeka, Veljko; Yu, Bo

    The LBNE Project is developing a design for multiple 20 kiloton liquid argon (LAr) time projection chambers to be used as the far detector for the Long Baseline Neutrino Experiment. An essential component of this design is a complete electronic readout system designed to operate in LAr (at 90K). This system is being implemented as a CMOS ASIC, in 180 nm commercial technology, that will provide low-noise readout of the signals induced on the TPC wires, digitization of those signals at 2 MS/s, zero-suppression, buffering and output multiplexing to a small number of cryostat feed-throughs. A resolution better than 1000 rms electrons at 200 pF input capacitance for an input range of 300 fC is required, along with low power (analog-only frontend has been successfully completed and fully evaluated, and will be used in the MicroBooNE LAr TPC. A prototype of the digital section has been fabricated and is being evaluated. The results demonstrate that CMOS transistors have lower noise and much improved dc characteristics at LAr temperature. We will describe the progress to date and plans for the remaining development.

  7. Radiation hard analog circuits for ALICE ITS upgrade

    Science.gov (United States)

    Gajanana, D.; Gromov, V.; Kuijer, P.; Kugathasan, T.; Snoeys, W.

    2016-03-01

    The ALICE experiment is planning to upgrade the ITS (Inner Tracking System) [1] detector during the LS2 shutdown. The present ITS will be fully replaced with a new one entirely based on CMOS monolithic pixel sensor chips fabricated in TowerJazz CMOS 0.18 μ m imaging technology. The large (3 cm × 1.5 cm = 4.5 cm2) ALPIDE (ALICE PIxel DEtector) sensor chip contains about 500 Kpixels, and will be used to cover a 10 m2 area with 12.5 Gpixels distributed over seven cylindrical layers. The ALPOSE chip was designed as a test chip for the various building blocks foreseen in the ALPIDE [2] pixel chip from CERN. The building blocks include: bandgap and Temperature sensor in four different flavours, and LDOs for powering schemes. One flavour of bandgap and temperature sensor will be included in the ALPIDE chip. Power consumption numbers have dropped very significantly making the use of LDOs less interesting, but in this paper all blocks are presented including measurement results before and after irradiation with neutrons to characterize robustness against displacement damage.

  8. Software and Parameters for Detailed TPC Studies in the CLIC CDR

    CERN Document Server

    Killenberg, M.

    2011-01-01

    For the TPC occupancy and time stamping studies in the CLIC CDR the MarlinTPC software package has been used in combination with Mokka for the full detector simulation. This document describes the working principle of the Marlin processors used for digitisation and reconstruction, and lists the parameters for reference.

  9. Commissioning of the Silicon Drift Detectors of the ALICE experiment at the LHC

    CERN Document Server

    Biolcati, Emanuele

    2009-01-01

    Silicon Drift Detectors (SDD) equip the two central layers of the Inner Tracking System of the ALICE experiment at the LHC. Main results of systematic studies of detector performance including noise, gain, drift speed and charge collection measurements will be reported

  10. Upgrade of the Inner Tracking System of ALICE

    CERN Document Server

    Kofarago, Monika

    2015-01-01

    The upgrade of the Inner Tracking System (ITS) of ALICE is planned for the second long shutdown of the LHC in 2019-2020. The ALICE physics program after the shutdown requires the ITS to have improved tracking capabilities and improved impact parameter resolution at very low transverse momentum, as well as a substantial increase in the readout rate. To fulfill these requirements the current ITS will be replaced by seven layers of Monolithic Active Pixel Sensors. The new detector will be moved as close as 23 mm to the interaction point and will have a significantly reduced material budget. Several prototypes of the sensor have been developed to test different aspects of the sensor design including prototypes with analog and digital readout, as well as small and final-size sensors. These prototypes have been thoroughly characterized both in laboratory tests and at test beam facilities including studies on the radiation hardness of the sensors. This contribution gives an overview of the current status of the rese...

  11. Measurement of neutral mesons in pp and Pb-Pb collisions at mid-rapidity with ALICE

    Science.gov (United States)

    Morreale, Astrid

    2016-12-01

    One of the key signatures of the Quark-Gluon Plasma (QGP), is the modification of hadron transverse momentum differential cross-sections in heavy-ion collisions (HIC) as compared to proton-proton (pp) collisions. Suppression of hadron production at high transverse momenta (pT) in HIC has been explained by the energy loss of the partons produced in the hard scattering processes which traverse the deconfined quantum chromodynamic (QCD) matter. The dependence of the observed suppression on the pT of the measured hadron towards higher pT is an important input for the theoretical understanding of jet quenching effects in the QGP and the nature of the energy loss. The ALICE experiment at the Large Hadron Collider (LHC) performs measurements of neutral meson inclusive spectra at mid-rapidity in a wide pT range in pp, p-Pb and Pb-Pb collisions. Neutral mesons (π0 , η , ω) are reconstructed via complementary methods, using the ALICE electromagnetic calorimeters, PHOS and EMCal, and by the central tracking system, identifying photons converted into e+e- pairs in the material of the inner barrel detectors (TPC and ITS).

  12. Amplification and Scintillation Properties of Oxygen-Rich Gas Mixtures for Optical-TPC Applications

    CERN Document Server

    Weissman, L; Chechik, R; Dangendorf, V; Gai, M; Tittelmeier, K; Weller, H R

    2006-01-01

    We studied electron amplification and light emission from avalanches in oxygen-containing gas mixtures. The mixtures investigated in this work included, among others, CO2 and N2O mixed with Triethylamine (TEA) or N2. Double-Step Parallel Gap (DSPG) multipliers and THick Gas Electron Multipliers (THGEM) were investigated. High light yields were measured from CO2+N2 and CO2+TEA, though with different emission spectra. We observed the characteristic wave-length emission of N2 and of TEA and used a polymer wave-length shifter to convert TEA UV-light into the visible spectrum. The results of these measurements indicate the applicability of optical recording of ionizing tracks in a TPC target-detector designed to study the cross section of the 16O(g,a)12C reaction, a central problem in nuclear astrophysics.

  13. Topological signature in the NEXT high pressure xenon TPC

    CERN Document Server

    ,

    2016-01-01

    The NEXT experiment aims to observe the neutrinoless double beta decay of Xe-136 in a high-pressure xenon gas TPC using electroluminescence to amplify the signal from ionization. One of the main advantages of this technology is the possibility to use the topology of events with energies close to Qbb as an extra tool to reject background. In these proceedings we show with data from prototypes that an extra background rejection factor of 24.3 +- 1.4 (stat.)% can be achieved, while maintaining an efficiency of 66.7 +- 1.% for signal events. The performance expected in NEW, the next stage of the experiment, is to improve to 12.9% +- 0.6% background acceptance for 66.9% +- 0.6% signal efficiency.

  14. NEXT: R and D towards a xenon high pressure TPC

    Energy Technology Data Exchange (ETDEWEB)

    Lux, Thorsten [Universitat Autonoma de Barcelona, Barcelona (Spain); Sanchez, Federico [IFAE, Barcelona (Spain); Gomez-Cadenas, J.J.; Martin-Albo, Justo; Ball, Markus; Novella, Pau; Monrabal, Francesc; Cervera, Anselmo [IFIC, Valencia (Spain); Garcia Irastorza, Igor [Universidad de Zaragoza, Zaragoza (Spain)

    2008-07-01

    An open question within the Standard Model is the nature of the neutrino. Is it a Majorana or a Dirac particle? The only way to answer this, is the search for neutrino-less double beta decays. Various experimental approaches are investigated for this reason e.g. diodes, bolometers, liquid Xenon. The key points for all of them is the high requirements on the energy resolution to distinguish between the decay with two neutrinos and the neutrino-less decay and the external background suppression. Recently some Spanish groups started a R and D program to investigate the possibility to use a pressurized Xenon TPC with MPGD readout (MM, LEM (GEM)). In the presentation the choice of gaseous Xe is motivated and an overview about the R and D plans is given.

  15. The liquid argon TPC for the ICARUS experiment

    CERN Document Server

    Arneodo, F

    1997-01-01

    The ICARUS project aims at the realisation of a large liquid argon TPC to be run at the Underground Laboratories of Gran Sasso in Italy. An intense R&D; activity has put on firm grounds this new detector technology and experimentally confirmed its feasibility on a few ton scale. Based on these solid achievements, the collaboration is now confident of being able to build and safely operate a multi-kton detector. The reseach program of the experiment involves the systematic study of a wide spectrum of physical phenomena covering many orders of magnitude in the energy deposited in the detector: from the few MeV of solar neutrino interactions, to the about one GeV of the proton decay and atmospheric neutrinos, up to the higher energies of neutrinos from accelerators.

  16. A TPC for sPHENIX at RHIC

    Science.gov (United States)

    Ramasubramanian, Niveditha; Dehmelt, Klaus; Sphenix Collaboration

    2016-09-01

    The sPHENIX detector is being proposed at the Relativistic Heavy Ion Collider to measure jets and upsilons for advancing our understanding of the quark gluon plasma formed in heavy ion collisions. It is also expected to form the basis of a day-1 detector for a future U.S. Electron Ion Collider. sPHENIX is based on a superconducting solenoidal magnet formerly used by the BaBar experiment, and of charged particle tracking, electromagnetic as well as hadronic calorimetry. It covers a large acceptance, 2 π in azimuth and pseudorapidities of | η | < 1, and allows to acquire data at a rate of up to 15 kHz. Furthermore, a Gas Electron Multiplier based Time Projection Chamber has been proposed to improve tracking resolution in a high multiplicity environment. In this talk we will present the current design and status of ongoing R&D and simulation studies for tracking with a TPC.

  17. NEXT, a HPGXe TPC for neutrinoless double beta decay searches

    CERN Document Server

    Granena, F; Nova, F; Rico, J; Sánchez, F; Nygren, D R; Barata, J A S; Borges, F I G M; Conde, C A N; Dias, T H V T; Fernandes, L M P; Freitas, E D C; Lopes, J A M; Monteiro, C M B; Santos, J M F dos; Santos, F P; Tavora, L M N; Veloso, J F C A; Calvo, E; Gil-Botella, I; Novella, P; Palomares, C; Verdugo, A; Giomataris, Yu; Ferrer-Ribas, E; Hernando-Morata, J A; Martínez, D; Cid, X; Ball, M; Carcel, S; Cervera-Villanueva, Anselmo; Díaz, J; Gil, A; Gómez-Cadenas, J J; Martín-Albo, J; Monrabal, F; Munoz-Vidal, J; Serra, L; Sorel, M; Yahlali, N; Bosch, R Esteve; Lerche, C W; Martinez, J D; Mora, F J; Sebastiá, A; Tarazona, A; Toledo, J F; Lazaro, M; Perez, J L; Ripoll, L; Carmona, J M; Cebrián, S; Dafni, T; Galan, J; Gomez, H; Iguaz, F J; Irastorza, I G; Luzón, G; Morales, J; Rodríguez, A; Ruz, J; Tomas, A; Villar, J A

    2009-01-01

    We propose a novel detection concept for neutrinoless double-beta decay searches. This concept is based on a Time Projection Chamber (TPC) filled with high-pressure gaseous xenon, and with separated-function capabilities for calorimetry and tracking. Thanks to its excellent energy resolution, together with its powerful background rejection provided by the distinct double-beta decay topological signature, the design discussed in this Letter Of Intent promises to be competitive and possibly out-perform existing proposals for next-generation neutrinoless double-beta decay experiments. We discuss the detection principles, design specifications, physics potential and R&D plans to construct a detector with 100 kg fiducial mass in the double-beta decay emitting isotope Xe(136), to be installed in the Canfranc Underground Laboratory.

  18. Readout of TPC Tracking Chambers with GEMs and Pixel Chip

    Energy Technology Data Exchange (ETDEWEB)

    Kadyk, John; Kim, T.; Freytsis, M.; Button-Shafer, J.; Kadyk, J.; Vahsen, S.E.; Wenzel, W.A.

    2007-12-21

    Two layers of GEMs and the ATLAS Pixel Chip, FEI3, have been combined and tested as a prototype for Time Projection Chamber (TPC) readout at the International Linear Collider (ILC). The double-layer GEM system amplifies charge with gain sufficient to detect all track ionization. The suitability of three gas mixtures for this application was investigated, and gain measurements are presented. A large sample of cosmic ray tracks was reconstructed in 3D by using the simultaneous timing and 2D spatial information from the pixel chip. The chip provides pixel charge measurement as well as timing. These results demonstrate that a double GEM and pixel combination, with a suitably modified pixel ASIC, could meet the stringent readout requirements of the ILC.

  19. ATLAS, CMS, LHCb and ALICE Career Networking Event 2015

    CERN Multimedia

    Marinov, Andrey; Strom, Derek Axel

    2015-01-01

    A networking event for alumni of the ATLAS, CMS, LHCb and ALICE experiments as well as current ATLAS/CMS/LHCb/ALICE postdocs and graduate students. This event offers an insight into career opportunities outside of academia. Various former members of the ATLAS, CMS, LHCb and ALICE collaborations will give presentations and be part of a panel discussion and elaborate on their experience in companies in a diverse range of fields (industry, finance, IT,...). Details at https://indico.cern.ch/event/440616

  20. Performance optimisations for distributed analysis in ALICE

    CERN Document Server

    Betev, L; Gheata, M; Grigoras, C; Hristov, P

    2014-01-01

    Performance is a critical issue in a production system accommodating hundreds of analysis users. Compared to a local session, distributed analysis is exposed to services and network latencies, remote data access and heterogeneous computing infrastructure, creating a more complex performance and efficiency optimization matrix. During the last 2 years, ALICE analysis shifted from a fast development phase to the more mature and stable code. At the same time, the framewo rks and tools for deployment, monitoring and management of large productions have evolved considerably too. The ALICE Grid production system is currently used by a fair share of organized and individual user analysis, consuming up to 30% or the available r esources and ranging from fully I/O - bound analysis code to CPU intensive correlations or resonances studies. While the intrinsic analysis performance is unlikely to improve by a large factor during the LHC long shutdown (LS1), the overall efficiency of the system has still to be improved by a...

  1. New Fast Interaction Trigger for ALICE

    Science.gov (United States)

    Trzaska, Wladyslaw Henryk

    2017-02-01

    The LHC heavy-ion luminosity and collision rate from 2021 onwards will considerably exceed the design parameters of the present ALICE forward trigger detectors and the introduction of the Muon Forward Tracker (MFT) will significantly reduce the space available for the new trigger detectors. To comply with these conditions a new Fast Interaction Trigger (FIT) will be built. FIT will be the main forward trigger, luminometer, and interaction-time detector. It will also determine multiplicity, centrality, and reaction plane of heavy-ion collisions. FIT will consist of two arrays of Cherenkov quartz radiators with MCP-PMT sensors and of a plastic scintillator ring. By increasing the overall acceptance of FIT, the scintillator will improve centrality and event plane resolution. It will also add sensitivity for the detection of beam-gas events and provide some degree of redundancy. FIT is currently undergoing an intense R&D and prototyping period. It is scheduled for installation in ALICE during 2020.

  2. The Wonderland of Operating the ALICE Experiment

    CERN Document Server

    Augustinus, A; Pinazza, O; Rosinský, P; Lechman, M; Jirdén, L; Chochula, P

    2011-01-01

    ALICE is one of the experiments at the Large Hadron Collider (LHC), CERN, Geneva, Switzerland. Composed of 18 sub-detectors each with numerous subsystems that need to be controlled and operated in a safe and efficient way. The Detector Control System (DCS) is the key to this and has been used by detector experts with success during the commissioning of the individual detectors. During the transition from commissioning to operation, more and more tasks were transferred from detector experts to central operators. By the end of the 2010 datataking campaign, the ALICE experiment was run by a small crew of central operators, with only a single controls operator. The transition from expert to non-expert operation constituted a real challenge in terms of tools, documentation and training. A relatively high turnover and diversity in the operator crew that is specific to the HEP experiment environment (as opposed to the more stable operation crews for accelerators) made this challenge even bigger. Thi...

  3. Upgrade of the ALICE Inner Tracking System

    CERN Document Server

    Belikov, Iouri

    2016-01-01

    A Large Ion Collider Experiment (ALICE) is built to study the properties of the strongly interacting matter created in heavy-ion collisions at the LHC. With the upgrade of its Inner Tracking System (ITS), the ALICE experiment is going to increase the rate of data taking by almost two orders of magnitude. At the same time, the precision of secondary vertex reconstruction will become by at least a factor 3 better than it currently is. In this talk, we briefly show some selected physics results motivating the upgrade of the ITS, describe the design goals and the layout of the new detector, and highlight a few important measurements that will be realized after the completion of this upgrade.

  4. The scene is set for ALICE

    CERN Multimedia

    2008-01-01

    Now that the electromagnetic calorimeter support and the mini space frame have been installed, practically all ALICE’s infrastructure is in place. The calorimeter support, an austenitic stainless steel shell weighing 30 tonnes, was slid gently inside the detector, in between the face of the magnet and the space frame. With the completion of two major installation projects, the scene is finally set for the ALICE experiment…or at least it nearly is, as a few design studies, minor installation jobs and measurements still need to be carried out before the curtain can finally be raised. The experiment’s chief engineer Diego Perini confirms: "All the heavy infrastructure for ALICE has been in place and ready for the grand opening since December 2007." The next step will be the installation of additional modules on the TOF and TRD detectors between January and March 2008, and physicists have already started testing the equipment with co...

  5. Overview of anisotropic flow measurements from ALICE

    Directory of Open Access Journals (Sweden)

    Zhou You

    2016-01-01

    Full Text Available Anisotropic flow is an important observable to study the properties of the hot and dense matter, the Quark Gluon Plasma (QGP, created in heavy-ion collisions. Measurements of anisotropic flow for inclusive and identified charged hadrons are reported in Pb–Pb, p–Pb and pp collisions with the ALICE detector. The comparison of experimental measurements to various theoretical calculations are also presented in these proceedings.

  6. Monitoring System for ALICE Surface Areas

    CERN Document Server

    Demirbasci, Oguz

    2016-01-01

    I have been at CERN for 12 weeks within the scope of Summer Student Programme working on a monitoring system project for surface areas of the ALICE experiment during this period of time. The development and implementation of a monitoring system for environmental parameters in the accessible areas where a cheap hardware setup can be deployed were aim of this project. This report explains how it was developed by using Arduino, Raspberry PI, WinCC OA and DIM protocol.

  7. Silicon drift detectors in the ALICE experiment

    CERN Document Server

    Bonvicini, V; Crescio, E; Giubellino, P; Hernández-Montoya, R; Kolojvari, A A; Mazza, G; Montaño-Zetina, L M; Nissinen, J; Nouais, D; Rashevsky, A; Rivetti, A; Tosello, F; Vacchi, A

    2000-01-01

    Silicon drift detectors (SDDs) are well suited to high-energy physics experiments with relatively low event rates. In particular SDDs will be used for the two intermediate layers of the Inner Tracking System of the ALICE experiment. Beam test results of linear SDD prototypes have shown a resolution of 40*30 mu m/sup 2/ and a cluster finding efficiency of essentially 100% with E=600 V/cm. (6 refs).

  8. High pt identified particle production in ALICE

    CERN Document Server

    Christiansen, Peter

    2013-01-01

    The ALICE experiment is a dedicated heavy ion physics detector at the LHC with unique capabilities for studying identified particle production. In this proceeding preliminary results for RAA for pi and K+p (sum), are reported, based on measurements in pp at sqrt(s) = 2.76 TeV and Pb-Pb at sqrt(sNN) = 2.76 TeV. The results are compared to theoretical predictions and measurements at RHIC.

  9. One module of the ALICE photon spectrometer

    CERN Multimedia

    Maximilien Brice

    2006-01-01

    The first module for the ALICE photon spectrometer has been completed. Each of the five modules will contain 3584 lead-tungstate crystals, a material as transparent as ordinary silica glass but with nearly four times the density. When a high-energy particle passes through one of these crystals it will scintillate, allowing the energy of electrons, positrons and photons to be measured through the 17 920 detection channels.

  10. The ALICE Software Release Validation cluster

    Science.gov (United States)

    Berzano, D.; Krzewicki, M.

    2015-12-01

    One of the most important steps of software lifecycle is Quality Assurance: this process comprehends both automatic tests and manual reviews, and all of them must pass successfully before the software is approved for production. Some tests, such as source code static analysis, are executed on a single dedicated service: in High Energy Physics, a full simulation and reconstruction chain on a distributed computing environment, backed with a sample “golden” dataset, is also necessary for the quality sign off. The ALICE experiment uses dedicated and virtualized computing infrastructures for the Release Validation in order not to taint the production environment (i.e. CVMFS and the Grid) with non-validated software and validation jobs: the ALICE Release Validation cluster is a disposable virtual cluster appliance based on CernVM and the Virtual Analysis Facility, capable of deploying on demand, and with a single command, a dedicated virtual HTCondor cluster with an automatically scalable number of virtual workers on any cloud supporting the standard EC2 interface. Input and output data are externally stored on EOS, and a dedicated CVMFS service is used to provide the software to be validated. We will show how the Release Validation Cluster deployment and disposal are completely transparent for the Release Manager, who simply triggers the validation from the ALICE build system's web interface. CernVM 3, based entirely on CVMFS, permits to boot any snapshot of the operating system in time: we will show how this allows us to certify each ALICE software release for an exact CernVM snapshot, addressing the problem of Long Term Data Preservation by ensuring a consistent environment for software execution and data reprocessing in the future.

  11. Foward Calorimetry in ALICE at LHC

    Science.gov (United States)

    Chujo, Tatsuya; Alice Focal Collaboration

    2014-09-01

    We present an upgrade proposal for calorimetry in the forward direction, FOCAL, to measure direct photons in η = 3 . 3 - 5 . 3 in ALICE at the Large Hadron Collider (LHC). We suggest to use an electromagnetic calorimeter based on the novel technology of silicon sensors with W absorbers for photons, together with a conventional hadron calorimeter for jet measurements and photon isolation. The current status of the FOCAL R&D project will be presented.

  12. Diffraction in ALICE and trigger efficiencies

    CERN Document Server

    Navin, Sparsh; Lietava, Roman

    ALICE is built to measure the properties of strongly interacting matter created in heavy-ion collisions. In addition, taking advantage of the low pT acceptance in the central barrel, ALICE is playing an important role in understanding pp collisions with minimum bias triggers at LHC energies. The work presented in this thesis is based on pp data simulated by the ALICE collaboration and early data collected at a center-of-mass energy of 7 TeV. A procedure to calculate trigger efficiencies and an estimate of the systematic uncertainty due to the limited acceptance of the detector are shown. A kinematic comparison between Monte Carlo event generators, PYTHIA 6, PYTHIA 8 and PHOJET is also presented. To improve the description of diffraction in PYTHIA, a hard diffractive component was added to PYTHIA 8 in 2009, which is described. Finally a trigger with a high efficiency for picking diffractive events is used to select a sample with an enhanced diffractive component from pp data. These data are compared to Monte ...

  13. Alice Walker’s Womanism in Meridian

    Institute of Scientific and Technical Information of China (English)

    GAN Lin

    2015-01-01

    Meridian is one of Alice Walker’s early work. It tells a story that happened in the American south during the 1960s and early 70s’. It describes the life of the main character, Meridian Hill, a black woman from a southern town, who got out of the oppression of white society, and ends up in participate in Civil Rights Movement. The paper firstly illustrates the soul of womanism—anti-sexism, anti-racism, sisiterhood as well as the maternity love, then analyzes how these theories permeated into the novel—Meridian. The paper paid attention to the function of this novel on the improvement of Alice Walker ’s womanism. In proving that womanism not only permeates into Meridian, but also improved womanism from many perspectives, it comes to the conclusion that Meridian is a novel to improve Alice Walker’s womanism, it serves as the good novel to highlight the African Culture, and made a great contribution for the encouragement of black women to seek for freedom in the society.

  14. ALICE: The best is yet to come

    CERN Multimedia

    CERN Bulletin

    2010-01-01

    The ALICE wonderland is the ion-ion collisions. However, the proton run was intensely used by the collaboration to get to know its detector in detail and to produce its first results in QCD-related matters. This very successful preparatory phase will now allow ALICE to enter the uncharted territory of the quark-gluon plasma at the extreme energies provided by the LHC.   The ALICE detector is optimized to study ion-ion collisions in which quark-gluon plasma may be formed. This type of matter, which existed a few moments after the Big Bang and appears when quarks and gluons are deconfined to form a highly dense and hot soup, has been studied at CERN’s SPS in the 1990s and later, from 2000 onwards, at much higher energy at RHIC in the US. Now it’s ALICE’s turn. “Quark-gluon plasma is created at very high temperatures but starts to cool down very quickly to become normal matter again. The high energy of the LHC puts us much higher above the threshold of its for...

  15. LS1 Report: ALICE ups the ante

    CERN Multimedia

    Katarina Anthony

    2014-01-01

    SPS up and running... LHC almost cold... CCC Operators back at their desks... all telltale signs of the start of Run 2! For the experiments, that means there are just a few short months left for them to prepare for beams. The CERN Bulletin will be checking in with each of the Big Four to see how they are getting on during these closing months...   It has been a long road for the ALICE LS1 team. From major improvements to the 19 sub-detectors to a full re-cabling and replacement of LEP-era electrical infrastructure, no part of the ALICE cavern has gone untouched.* With the experiment set to close in early December, the teams are making finishing touches before turning their focus towards re-commissioning and calibration. "Earlier this week, we installed the last two modules of the di-jet calorimeter," explains Werner Riegler, ALICE technical coordinator. "These are the final parts of a 60 degree calorimeter extension that is installed opposite the present calorimeter, c...

  16. The ALICE muon spectrometer: trigger detectors and quarkonia detection in p-p collisions

    CERN Document Server

    Gagliardi, Martino

    This work was carried out in the context of the optimisation of the performances of the muon spectrometer of the forthcoming ALICE experiment at the Large Hadron Collider (LHC, CERN). The aim of ALICE is the study of nuclear matter at the highest energy densities ever accessed experimentally. More in detail, the focus is on the expected phase transition to a deconfined phase of matter where the degrees of freedom are those of quarks and gluons: the Quark-Gluon Plasma. The conditions for QGP formation are expected to be achieved in highly relativistic heavy ion collisions. The energy in the centre of mass of Pb-Pb collisions at the LHC will be 5.5 TeV per nucleon pair. The ALICE physics program also includes data-taking in p-p collisions at the centre-of-mass-energy of 14 TeV. The ALICE muon spectrometer has been designed for the detection of heavy quarkonia through their muon decay: both theoretical predictions and experimental data obtained at SPS and RHIC indicate that the production of these resonances sho...

  17. Using Alice 2.0 to Design Games for People with Stroke.

    Science.gov (United States)

    Proffitt, Rachel; Kelleher, Caitlin; Baum, M Carolyn; Engsberg, Jack

    2012-08-01

    Computer and videogames are gaining in popularity as rehabilitation tools. Unfortunately, most systems still require extensive programming/engineering knowledge to create, something that therapists, as novice programmers, do not possess. There is software designed to allow novice programmers to create storyboard and games through simple drag-and-drop formats; however, the applications for therapeutic game development have not been studied. The purpose of this study was to have an occupational therapy (OT) student with no prior computer programming experience learn how to create computer games for persons with stroke using Alice 2.0, a drag-and-drop editor, designed by Carnegie Mellon University (Pittsburgh, PA). The OT student learned how to use Alice 2.0 through a textbook, tutorials, and assistance from computer science students. She kept a journal of her process, detailing her successes and challenges. The OT student created three games for people with stroke using Alice 2.0. She found that although there were many supports in Alice for creating stories, it lacked critical pieces necessary for game design. Her recommendations for a future programming environment for therapists were that it (1) be efficient, (2) include basic game design pieces so therapists do not have to create them, (3) provide technical support, and (4) be simple. With the incorporation of these recommendations, a future programming environment for therapists will be an effective tool for therapeutic game development.

  18. SAMURAI-TPC: A Time Projection Chamber for Constraining the Asymmetry Energy at High Density

    Science.gov (United States)

    McIntosh, A. B.; Maass, N.; Yennello, S. J.; Barney, J.; Chajecki, Z.; Chan, C. F.; Dunn, J. W.; Estee, J.; Gilbert, J.; Lu, F.; Lynch, W. G.; Shane, R.; Tsang, M. B.; Famiano, M.; Isobe, T.; Sakurai, H.; Taketani, A.; Murakami, T.; Samurai-Tpc Collaboration

    2011-10-01

    The SAMURAI-TPC is a time projection chamber designed to measure pions and light charged particles. By measuring pion yield ratios and particle flow in heavy ion collisions around E = 200A MeV, we expect to constrain the behavior of the nuclear asymmetry energy around twice saturation density. In this talk, the design and construction of the TPC components will be discussed. Upon completion, the SAMURAI-TPC will be installed in the SAMURAI spectrometer at the Radioactive Isotope Beam Facility at RIKEN, Japan. This work is supported by the Department of Energy (DE-SC0004835).

  19. Uinunud Alice'i toas teeb imesid lavamaagia / Jaanus Kaasik

    Index Scriptorium Estoniae

    Kaasik, Jaanus

    2004-01-01

    7. veebr. esietendus Vanemuises tantsulavastus "Alice imedemaal". Etendus põhineb briti kirjaniku L. Carrolli samanimelisel lasteraamatul, koreograaf M. Murdmaa, kunstnik K. Jancis ja muusika on kirjutanud ungari helilooja S. Kall̤s, Alice'i osa tantsib korealanna Hye Min Kim

  20. ALICE EXPERIMENT Time of Flight Multigap Resistive Plate Chambers

    CERN Multimedia

    2003-01-01

    Charged particules are identified in ALICE by Time-Of-Flight (TOF); heavier particles are slower and it takes for them longer to reach the outer layers of the detector. For TOF system ALICE uses detectors called Multigap Resistive Plate Chambers (MRPC), like the prototype shown here.

  1. ALICE Diffractive Detector Control System for RUN-II in the ALICE Experiment

    CERN Document Server

    INSPIRE-00522336; Martinez, M.I.; Monzon, I. Leon

    2016-01-01

    This paper describes general characteristics of the deployment and commissioned of the Detector Control System (DCS) AD0 for the second phase of the Large Hadron Collider (LHC). The AD0 detector is installed in the ALICE experiment to provide a better selection of diffractive events.

  2. Optically read out GEM-based TPC operation and preliminary scintillation studies

    CERN Document Server

    Galgoczi, Gabor

    2016-01-01

    The main goal of this project was to realise the reconstruction of tracks in an optically read out GEM (Gas Electron Multiplier) based Time Projection Chamber (TPC). Secondary goal was to initialise a series of systematic studies on the scintillation of particles in Ar/CF4 (80-20%) mixture. Track reconstruction is needed for primary scintillation studies as only tracks fully contained can be considered. A vetoing and trigerring logic was built for the TPC from NIM modules.

  3. Sealed operation, and circulation and purification of gas in the HARPO TPC

    CERN Document Server

    Frotin, M; Attié, D; Bernard, D; Dauvois, V; Delbart, A; Durand, D; Geerebaert, Y; Legand, S; Magnier, P; Poilleux, P; Semeniouk, I

    2015-01-01

    HARPO is a time projection chamber (TPC) demonstrator of a gamma-ray telescope and polarimeter in the MeV-GeV range, for a future space mission. We present the evolution of the TPC performance over a five month sealed-mode operation, by the analysis of cosmic-ray data, followed by the fast and complete recovery of the initial gas properties using a lightweight gas circulation and purification system.

  4. Behavior of TPC`s in a high particle flux environment

    Energy Technology Data Exchange (ETDEWEB)

    Etkin, A.; Eisemann, S.E.; Foley, K.J.; Hackenburg, R.W.; Longacre, R.S.; Love, W.A.; Morris, T.W.; Platner, E.D.; Saulys, A.C. [Brookhaven National Lab., Upton, NY (United States); Lindenbaum, S.J. [Brookhaven National Lab., Upton, NY (United States)]|[City Coll., New York, NY (United States); Chan, C.S.; Kramer, M.A.; Zhao, K.H.; Zhu, Y. [City Coll., New York, NY (United States); Hallman, T.J.; Madansky, L. [Johns Hopkins Univ., Baltimore, MD (United States); Ahmad, S.; Bonner, B.E.; Buchanan, J.A.; Chiou, C.N.; Clement, J.M.; Mutchler, G.S.; Roberts, J.B. [Rice Univ., Houston, TX (United States). Bonner Nuclear Labs.

    1991-12-13

    TPC`s (Time Projection Chamber) used in E-810 at the AGS (Alternating Gradient Synchrotron) were exposed to fluxes equivalent to more than 10{sup 7} minimum ionizing particles per second to find if such high fluxes cause gain changes or distortions of the electric field. Initial results of these and other tests are presented and the consequences for the RHIC (Relativistic Heavy Ion Collider) TPC-based experiments are discussed.

  5. Behavior of TPC`s in a high particle flux environment

    Energy Technology Data Exchange (ETDEWEB)

    Etkin, A.; Eiseman, S.E.; Foley, K.J.; Hackenburg, R.W.; Longacre, R.S.; Love, W.A.; Morris, T.W.; Platner, E.D.; Saulys, A.C. [Brookhaven National Lab., Upton, NY (United States); Lindenbaum, S.J. [Brookhaven National Lab., Upton, NY (United States)]|[City Coll., New York, NY (United States); Chan, C.S.; Kramer, M.A.; Zhao, K.H.; Zhu, Y. [City Coll., New York, NY (United States); Hallman, T.J.; Madansky, L. [Johns Hopkins Univ., Baltimore, MD (United States); Ahmad, S.; Bonner, B.E.; Buchanan, J.A.; Chiou, C.N.; Clement, J.M.; Mutchler, G.S.; Roberts, J.B. [Rice Univ., Houston, TX (United States)

    1992-07-08

    TPC`s (Time Projection Chamber) used in E-810 at the AGS (Alternating Gradient Synchrotron) were exposed to fluxes equivalent to more than 10{sup 7} minimum ionizing particles per second to find if such high fluxes cause gain changes or distortions of the electric field. Initial results of these and other tests are presented and the consequences for the RHIC (Relativistic Heavy Ion collider) TPC-based experiments are discussed.

  6. Behavior of TPC`s in a high particle flux environment

    Energy Technology Data Exchange (ETDEWEB)

    Etkin, A.; Eiseman, S.E.; Foley, K.J.; Hackenburg, R.W.; Longacre, R.S.; Love, W.A.; Morris, T.W.; Platner, E.D.; Saulys, A.C.; Lindenbaum, S.J. [Brookhaven National Lab., Upton, NY (United States); Chan, C.S.; Kramer, M.A.; Zhao, K.H.; Zhu, Y. [City College of New York, New York (United States); Hallman, T.J.; Madansky, L. [Johns Hopkins Univ., Baltimore, MD (United States); Ahmad, S.; Bonner, B.E.; Buchanan, J.A.; Chiou, C.N.; Clement, J.M.; Mutchler, G.S.; Roberts, J.B. [Bonner Nuclear Lab., Houston, TX (United States)

    1991-12-31

    TPC`s (Time Projection Chamber) used in E-810 at the TAGS (Alternating Gradient Synchrotron) were exposed to fluxes equivalent to more than 10 minimum ionizing particles per second to find if such high fluxes cause gain changes or distortions of the electric field. Initial results of these and other tests are presented and the consequences for the RHIC (Relativistic Heavy Ion Collider) TPC-based experiments are discussed.

  7. Behavior of TPC`s in a high particle flux environment

    Energy Technology Data Exchange (ETDEWEB)

    Etkin, A.; Eiseman, S.E.; Foley, K.J.; Hackenburg, R.W.; Longacre, R.S.; Love, W.A.; Morris, T.W.; Platner, E.D.; Saulys, A.C. [Brookhaven National Lab., Upton, NY (United States); Lindenbaum, S.J. [Brookhaven National Lab., Upton, NY (United States)]|[City Coll., New York, NY (United States); Chan, C.S.; Kramer, M.A.; Zhao, K.H.; Zhu, Y. [City Coll., New York, NY (United States); Hallman, T.J.; Madansky, L. [Johns Hopkins Univ., Baltimore, MD (United States); Ahmad, S.; Bonner, B.E.; Buchanan, J.A.; Chiou, C.N.; Clement, J.M.; Mutchler, G.S.; Roberts, J.B. [Rice Univ., Houston, TX (United States). Bonner Nuclear Labs.

    1991-12-31

    TPC`s (Time Projection Chamber) used in E-810 at the AGS (Alternating Gradient Synchrotron) were exposed to fluxes equivalent to more than 10{sup 7} minimum ionizing particles per second to find if such high fluxes cause gain changes or distortions of the electric field. Initial results of these and other tests are presented and the consequences for the RHIC (Relativistic Heavy Ion Collider) TPC-based experiments are discussed.

  8. Characteristics of the ALICE Silicon Drift Detector

    CERN Document Server

    Bonvicini, V; Crescio, E; Giubellino, P; Hernández-Montoya, R; Kolojvari, A A; Montaño, L M; Nouais, D; Piemonte, C; Rashevsky, A; Tosello, F; Vacchi, A; Wheadon, R

    2001-01-01

    A Silicon Drift Detector (SDD) with an active area of 7.0 x 7.5 cm2 has been designed, produced and tested for the ALICE Inner Tracking System. The development of the SDD has been focussed on the capability of the detector to work without an external support to the integrated high voltage divider. Severalfeatures have been implemented in the design in order to increase the robustness and the long-term electrical stability of the detector. One of the prototypes has been tested in a pion beam at the CERN SPS. Preliminary results on the position resolution are given.

  9. Heavy-flavour production in ALICE

    Energy Technology Data Exchange (ETDEWEB)

    Sakai, Shingo

    2014-06-15

    We present measurements of heavy-flavour production in Pb–Pb collisions at √(s{sub NN})=2.76 TeV and in p–Pb collisions at 5.02 TeV by the ALICE Collaboration. A strong suppression of heavy-flavour production at high p{sub T} is observed in central Pb–Pb collisions, while non-zero elliptic flow is seen at low p{sub T} in semi-central collisions. The cold nuclear matter effects on the measurements in Pb–Pb collisions have been investigated in p–Pb collisions, and no large effects have been observed.

  10. Two pore channel 2 (TPC2) inhibits autophagosomal-lysosomal fusion by alkalinizing lysosomal pH.

    Science.gov (United States)

    Lu, Yingying; Hao, Bai-Xia; Graeff, Richard; Wong, Connie W M; Wu, Wu-Tian; Yue, Jianbo

    2013-08-16

    Autophagy is an evolutionarily conserved lysosomal degradation pathway, yet the underlying mechanisms remain poorly understood. Nicotinic acid adenine dinucleotide phosphate (NAADP), one of the most potent Ca(2+) mobilizing messengers, elicits Ca(2+) release from lysosomes via the two pore channel 2 (TPC2) in many cell types. Here we found that overexpression of TPC2 in HeLa or mouse embryonic stem cells inhibited autophagosomal-lysosomal fusion, thereby resulting in the accumulation of autophagosomes. Treatment of TPC2 expressing cells with a cell permeant-NAADP agonist, NAADP-AM, further induced autophagosome accumulation. On the other hand, TPC2 knockdown or treatment of cells with Ned-19, a NAADP antagonist, markedly decreased the accumulation of autophagosomes. TPC2-induced accumulation of autophagosomes was also markedly blocked by ATG5 knockdown. Interestingly, inhibiting mTOR activity failed to increase TPC2-induced autophagosome accumulation. Instead, we found that overexpression of TPC2 alkalinized lysosomal pH, and lysosomal re-acidification abolished TPC2-induced autophagosome accumulation. In addition, TPC2 overexpression had no effect on general endosomal-lysosomal degradation but prevented the recruitment of Rab-7 to autophagosomes. Taken together, our data demonstrate that TPC2/NAADP/Ca(2+) signaling alkalinizes lysosomal pH to specifically inhibit the later stage of basal autophagy progression.

  11. Readout of the upgraded ALICE-ITS

    Science.gov (United States)

    Szczepankiewicz, A.

    2016-07-01

    The ALICE experiment will undergo a major upgrade during the second long shutdown of the CERN LHC. As part of this program, the present Inner Tracking System (ITS), which employs different layers of hybrid pixels, silicon drift and strip detectors, will be replaced by a completely new tracker composed of seven layers of monolithic active pixel sensors. The upgraded ITS will have more than twelve billion pixels in total, producing 300 Gbit/s of data when tracking 50 kHz Pb-Pb events. Two families of pixel chips realized with the TowerJazz CMOS imaging process have been developed as candidate sensors: the ALPIDE, which uses a proprietary readout and sparsification mechanism and the MISTRAL-O, based on a proven rolling shutter architecture. Both chips can operate in continuous mode, with the ALPIDE also supporting triggered operations. As the communication IP blocks are shared among the two chip families, it has been possible to develop a common Readout Electronics. All the sensor components (analog stages, state machines, buffers, FIFOs, etc.) have been modelled in a system level simulation, which has been extensively used to optimize both the sensor and the whole readout chain design in an iterative process. This contribution covers the progress of the R&D efforts and the overall expected performance of the ALICE-ITS readout system.

  12. Detection of atmospheric muons with ALICE detectors

    Energy Technology Data Exchange (ETDEWEB)

    Alessandro, B. [Istituto Nazionale di Fisica Nucleare and Dep. di Fisica Universita di Torino, Torino (Italy); Cortes Maldonado, I. [Fac. Ciencias Fisico Mat. and Fac. Ciencias Electronica, Benemerita Universidad Autonoma de Puebla (Mexico); Cuautle, E. [Instituto de Ciencias Nucleares, Universidad Nacional Autonoma de Mexico (Mexico); Fernandez Tellez, A. [Fac. Ciencias Fisico Mat. and Fac. Ciencias Electronica, Benemerita Universidad Autonoma de Puebla (Mexico); Gomez Jimenez, R. [Dpto. de Fisica, Centro de Investigacion y Estudios Avanzados (Mexico); Gonzalez Santos, H. [Fac. Ciencias Fisico Mat. and Fac. Ciencias Electronica, Benemerita Universidad Autonoma de Puebla (Mexico); Herrera Corral, G. [Escuela de Fisica, Universidad Autonoma de Sinaloa, Culiacan, Sinaloa (Mexico); Leon, I. [Dpto. de Fisica, Centro de Investigacion y Estudios Avanzados (Mexico); Martinez, M.I.; Munoz Mata, J.L. [Fac. Ciencias Fisico Mat. and Fac. Ciencias Electronica, Benemerita Universidad Autonoma de Puebla (Mexico); Podesta, P. [Dpto. de Fisica, Centro de Investigacion y Estudios Avanzados (Mexico); Ramirez Reyes, A. [Escuela de Fisica, Universidad Autonoma de Sinaloa, Culiacan, Sinaloa (Mexico); Rodriguez Cahuantzi, M., E-mail: mrodrigu@mail.cern.c [Fac. Ciencias Fisico Mat. and Fac. Ciencias Electronica, Benemerita Universidad Autonoma de Puebla (Mexico); Sitta, M. [Universita Piemonte Orientale, Alessandria (Italy); Subieta, M. [Istituto Nazionale di Fisica Nucleare and Dep. di Fisica Universita di Torino, Torino (Italy); Tejeda Munoz, G.; Vargas, A.; Vergara, S. [Fac. Ciencias Fisico Mat. and Fac. Ciencias Electronica, Benemerita Universidad Autonoma de Puebla (Mexico)

    2010-05-21

    The calibration, alignment and commissioning of most of the ALICE (A Large Ion Collider Experiment at the CERN LHC) detectors have required a large amount of cosmic events during 2008. In particular two types of cosmic triggers have been implemented to record the atmospheric muons passing through ALICE. The first trigger, called ACORDE trigger, is performed by 60 scintillators located on the top of three sides of the large L3 magnet surrounding the central detectors, and selects atmospheric muons. The Silicon Pixel Detector (SPD) installed on the first two layers of the Inner Tracking System (ITS) gives the second trigger, called SPD trigger. This trigger selects mainly events with a single atmospheric muon crossing the SPD. Some particular events, in which the atmospheric muon interacts with the iron of the L3 magnet and creates a shower of particles crossing the SPD, are also selected. In this work the reconstruction of events with these two triggers will be presented. In particular, the performance of the ACORDE detector will be discussed by the analysis of multi-muon events. Some physical distributions are also shown.

  13. Quarkonium production in ALICE at the LHC

    CERN Document Server

    Hadjidakis, Cynthia

    2014-01-01

    In heavy-ion collisions at the LHC, the ALICE Collaboration is studying Quantum Chromodynamics (QCD) matter at very high energy density where the formation of a Quark Gluon Plasma (QGP) is expected. Quarkonium production is an important probe to characterize the QGP properties. High precision data in pp collisions provide the baseline of Pb-Pb measurements and p-Pb collisions serve to quantify the amount of initial and/or final state effects, related to cold nuclear matter, that are largely unknown at the LHC energy. Since 2010, the LHC provided Pb-Pb collisions at sqrt{s_{NN}} = 2.76 TeV, pp collisions at various energies and in 2013 p-Pb collisions at sqrt{s_{NN}} = 5.02 TeV. In ALICE, quarkonia can be reconstructed at forward rapidity in the dimuon channel and at mid-rapidity in the dielectron channel, and, for both channels, down to zero transverse momentum. New measurements on inclusive production of J/psi, psi (2S) and Upsilon performed in p-Pb collisions and on the p_T dependence of inclusive J/psi in ...

  14. Quarkonium production in ALICE at the LHC

    Energy Technology Data Exchange (ETDEWEB)

    Hadjidakis, Cynthia

    2014-12-15

    In heavy-ion collisions at the LHC, the ALICE Collaboration is studying Quantum Chromodynamics (QCD) matter at very high energy density where the formation of a Quark Gluon Plasma (QGP) is expected. Quarkonium production is an important probe to characterize the QGP properties. High precision data in pp collisions provide the baseline of the Pb–Pb measurements and data in p–Pb collisions serve to quantify the contribution of initial and/or final state effects, related to cold nuclear matter. Since 2010, the LHC provided Pb–Pb collisions at √(s{sub NN})=2.76 TeV, pp collisions at various energies and in 2013 p–Pb collisions at √(s{sub NN})=5.02 TeV. ALICE measures quarkonium production from zero transverse momentum in the dimuon channel at forward rapidity and in the dielectron channel at mid-rapidity. This proceedings presents the new results on inclusive production of J/ψ, ψ(2S) and ϒ performed in p–Pb collisions and on the p{sub T} dependence of inclusive J/ψ in Pb–Pb collisions. The contribution of J/ψ from B hadrons to the inclusive production in Pb–Pb is also discussed. Finally, the p–Pb measurements allow an estimation of the contribution of the cold nuclear matter effect to the Pb–Pb measurements and this is also reported.

  15. AliEn - EDG Interoperability in ALICE

    CERN Document Server

    Bagnasco, S; Buncic, P; Carminati, F; Cerello, P G; Saiz, P

    2003-01-01

    AliEn (ALICE Environment) is a GRID-like system for large scale job submission and distributed data management developed and used in the context of ALICE, the CERN LHC heavy-ion experiment. With the aim of exploiting upcoming Grid resources to run AliEn-managed jobs and store the produced data, the problem of AliEn-EDG interoperability was addressed and an in-terface was designed. One or more EDG (European Data Grid) User Interface machines run the AliEn software suite (Cluster Monitor, Storage Element and Computing Element), and act as interface nodes between the systems. An EDG Resource Broker is seen by the AliEn server as a single Computing Element, while the EDG storage is seen by AliEn as a single, large Storage Element; files produced in EDG sites are registered in both the EDG Replica Catalogue and in the AliEn Data Catalogue, thus ensuring accessibility from both worlds. In fact, both registrations are required: the AliEn one is used for the data management, the EDG one to guarantee the integrity and...

  16. Upgrade of the ALICE Inner Tracking System

    CERN Document Server

    Rossegger, Stefan

    2013-01-01

    The Inner Tracking System (ITS) is the key ALICE detector for the study of heavy flavour production at LHC. Heavy flavor can be studied via the identification of short-lived hadrons containing heavy quarks which have a mean proper decay length in the order of 100-300 $\\mu$m. To accomplish this task, the ITS is composed of six cylindrical layers of silicon detectors (two pixel, two drift and two strip) with a radial coverage from 3.9 to 43 cm and a material budget of 1.1% X0 per layer. %In particular, the properties of the two innermost layers define the ITS performance in measuring the displaced vertex of such short-lived particles. In order to enhance the ALICE physics capabilities, and, in particular, the tracking performance for heavy-flavour detection, the possibility of an ITS upgrade has been studied in great detail. It will make use of the spectacular progress made in the field of imaging sensors over the last ten years as well as the possibility to install a smaller radius beampipe. The upgraded detec...

  17. Upgrade of the ALICE Inner Tracking System

    CERN Document Server

    INSPIRE-00246160

    2015-01-01

    {During the Long Shutdown 2 (LS2) of the LHC in 2018/2019, the ALICE experiment plans the installation of a novel Inner Tracking System (ITS). The upgraded detector will fully replace the current ITS having six layers by seven layers of Monolithic Active Pixel Sensors (MAPS). The upgraded ITS will have significantly improved tracking and vertexing capabilities, as well as readout rate to cope with the expected increased Pb-Pb luminosity in LHC. The choice of MAPS has been driven by the specific requirements of ALICE as a heavy ion experiment dealing with rare probes at low $p_\\mathrm{T}$. This leads to stringent requirements on the material budget of 0.3$\\%~X/X_{0}$ per layer for the three innermost layers. Furthermore, the detector will see large hit densities of $\\sim 19~\\mathrm{cm}^{-2}/\\mathrm{event}$ on average for minimum-bias events in the inner most layer and has to stand moderate radiation loads of 700 kRad TID and $1\\times 10^{13}$ 1 MeV n$_\\mathrm{eq}/\\mathrm{cm}^{2}$ NIEL at maximum. The MAPS dete...

  18. Particle identification in ALICE: a Bayesian approach

    CERN Document Server

    Adam, Jaroslav; Aggarwal, Madan Mohan; Aglieri Rinella, Gianluca; Agnello, Michelangelo; Agrawal, Neelima; Ahammed, Zubayer; Ahmad, Shakeel; Ahn, Sang Un; Aiola, Salvatore; Akindinov, Alexander; Alam, Sk Noor; Silva De Albuquerque, Danilo; Aleksandrov, Dmitry; Alessandro, Bruno; Alexandre, Didier; Alfaro Molina, Jose Ruben; Alici, Andrea; Alkin, Anton; Millan Almaraz, Jesus Roberto; Alme, Johan; Alt, Torsten; Altinpinar, Sedat; Altsybeev, Igor; Alves Garcia Prado, Caio; Andrei, Cristian; Andronic, Anton; Anguelov, Venelin; Anticic, Tome; Antinori, Federico; Antonioli, Pietro; Aphecetche, Laurent Bernard; Appelshaeuser, Harald; Arcelli, Silvia; Arnaldi, Roberta; Arnold, Oliver Werner; Arsene, Ionut Cristian; Arslandok, Mesut; Audurier, Benjamin; Augustinus, Andre; Averbeck, Ralf Peter; Azmi, Mohd Danish; Badala, Angela; Baek, Yong Wook; Bagnasco, Stefano; Bailhache, Raphaelle Marie; Bala, Renu; Balasubramanian, Supraja; Baldisseri, Alberto; Baral, Rama Chandra; Barbano, Anastasia Maria; Barbera, Roberto; Barile, Francesco; Barnafoldi, Gergely Gabor; Barnby, Lee Stuart; Ramillien Barret, Valerie; Bartalini, Paolo; Barth, Klaus; Bartke, Jerzy Gustaw; Bartsch, Esther; Basile, Maurizio; Bastid, Nicole; Basu, Sumit; Bathen, Bastian; Batigne, Guillaume; Batista Camejo, Arianna; Batyunya, Boris; Batzing, Paul Christoph; Bearden, Ian Gardner; Beck, Hans; Bedda, Cristina; Behera, Nirbhay Kumar; Belikov, Iouri; Bellini, Francesca; Bello Martinez, Hector; Bellwied, Rene; Belmont Iii, Ronald John; Belmont Moreno, Ernesto; Belyaev, Vladimir; Benacek, Pavel; Bencedi, Gyula; Beole, Stefania; Berceanu, Ionela; Bercuci, Alexandru; Berdnikov, Yaroslav; Berenyi, Daniel; Bertens, Redmer Alexander; Berzano, Dario; Betev, Latchezar; Bhasin, Anju; Bhat, Inayat Rasool; Bhati, Ashok Kumar; Bhattacharjee, Buddhadeb; Bhom, Jihyun; Bianchi, Livio; Bianchi, Nicola; Bianchin, Chiara; Bielcik, Jaroslav; Bielcikova, Jana; Bilandzic, Ante; Biro, Gabor; Biswas, Rathijit; Biswas, Saikat; Bjelogrlic, Sandro; Blair, Justin Thomas; Blau, Dmitry; Blume, Christoph; Bock, Friederike; Bogdanov, Alexey; Boggild, Hans; Boldizsar, Laszlo; Bombara, Marek; Book, Julian Heinz; Borel, Herve; Borissov, Alexander; Borri, Marcello; Bossu, Francesco; Botta, Elena; Bourjau, Christian; Braun-Munzinger, Peter; Bregant, Marco; Breitner, Timo Gunther; Broker, Theo Alexander; Browning, Tyler Allen; Broz, Michal; Brucken, Erik Jens; Bruna, Elena; Bruno, Giuseppe Eugenio; Budnikov, Dmitry; Buesching, Henner; Bufalino, Stefania; Buncic, Predrag; Busch, Oliver; Buthelezi, Edith Zinhle; Bashir Butt, Jamila; Buxton, Jesse Thomas; Cabala, Jan; Caffarri, Davide; Cai, Xu; Caines, Helen Louise; Calero Diaz, Liliet; Caliva, Alberto; Calvo Villar, Ernesto; Camerini, Paolo; Carena, Francesco; Carena, Wisla; Carnesecchi, Francesca; Castillo Castellanos, Javier Ernesto; Castro, Andrew John; Casula, Ester Anna Rita; Ceballos Sanchez, Cesar; Cepila, Jan; Cerello, Piergiorgio; Cerkala, Jakub; Chang, Beomsu; Chapeland, Sylvain; Chartier, Marielle; Charvet, Jean-Luc Fernand; Chattopadhyay, Subhasis; Chattopadhyay, Sukalyan; Chauvin, Alex; Chelnokov, Volodymyr; Cherney, Michael Gerard; Cheshkov, Cvetan Valeriev; Cheynis, Brigitte; Chibante Barroso, Vasco Miguel; Dobrigkeit Chinellato, David; Cho, Soyeon; Chochula, Peter; Choi, Kyungeon; Chojnacki, Marek; Choudhury, Subikash; Christakoglou, Panagiotis; Christensen, Christian Holm; Christiansen, Peter; Chujo, Tatsuya; Chung, Suh-Urk; Cicalo, Corrado; Cifarelli, Luisa; Cindolo, Federico; Cleymans, Jean Willy Andre; Colamaria, Fabio Filippo; Colella, Domenico; Collu, Alberto; Colocci, Manuel; Conesa Balbastre, Gustavo; Conesa Del Valle, Zaida; Connors, Megan Elizabeth; Contreras Nuno, Jesus Guillermo; Cormier, Thomas Michael; Corrales Morales, Yasser; Cortes Maldonado, Ismael; Cortese, Pietro; Cosentino, Mauro Rogerio; Costa, Filippo; Crochet, Philippe; Cruz Albino, Rigoberto; Cuautle Flores, Eleazar; Cunqueiro Mendez, Leticia; Dahms, Torsten; Dainese, Andrea; Danisch, Meike Charlotte; Danu, Andrea; Das, Debasish; Das, Indranil; Das, Supriya; Dash, Ajay Kumar; Dash, Sadhana; De, Sudipan; De Caro, Annalisa; De Cataldo, Giacinto; De Conti, Camila; De Cuveland, Jan; De Falco, Alessandro; De Gruttola, Daniele; De Marco, Nora; De Pasquale, Salvatore; Deisting, Alexander; Deloff, Andrzej; Denes, Ervin Sandor; Deplano, Caterina; Dhankher, Preeti; Di Bari, Domenico; Di Mauro, Antonio; Di Nezza, Pasquale; Diaz Corchero, Miguel Angel; Dietel, Thomas; Dillenseger, Pascal; Divia, Roberto; Djuvsland, Oeystein; Dobrin, Alexandru Florin; Domenicis Gimenez, Diogenes; Donigus, Benjamin; Dordic, Olja; Drozhzhova, Tatiana; Dubey, Anand Kumar; Dubla, Andrea; Ducroux, Laurent; Dupieux, Pascal; Ehlers Iii, Raymond James; Elia, Domenico; Endress, Eric; Engel, Heiko; Epple, Eliane; Erazmus, Barbara Ewa; Erdemir, Irem; Erhardt, Filip; Espagnon, Bruno; Estienne, Magali Danielle; Esumi, Shinichi; Eum, Jongsik; Evans, David; Evdokimov, Sergey; Eyyubova, Gyulnara; Fabbietti, Laura; Fabris, Daniela; Faivre, Julien; Fantoni, Alessandra; Fasel, Markus; Feldkamp, Linus; Feliciello, Alessandro; Feofilov, Grigorii; Ferencei, Jozef; Fernandez Tellez, Arturo; Gonzalez Ferreiro, Elena; Ferretti, Alessandro; Festanti, Andrea; Feuillard, Victor Jose Gaston; Figiel, Jan; Araujo Silva Figueredo, Marcel; Filchagin, Sergey; Finogeev, Dmitry; Fionda, Fiorella; Fiore, Enrichetta Maria; Fleck, Martin Gabriel; Floris, Michele; Foertsch, Siegfried Valentin; Foka, Panagiota; Fokin, Sergey; Fragiacomo, Enrico; Francescon, Andrea; Frankenfeld, Ulrich Michael; Fronze, Gabriele Gaetano; Fuchs, Ulrich; Furget, Christophe; Furs, Artur; Fusco Girard, Mario; Gaardhoeje, Jens Joergen; Gagliardi, Martino; Gago Medina, Alberto Martin; Gallio, Mauro; Gangadharan, Dhevan Raja; Ganoti, Paraskevi; Gao, Chaosong; Garabatos Cuadrado, Jose; Garcia-Solis, Edmundo Javier; Gargiulo, Corrado; Gasik, Piotr Jan; Gauger, Erin Frances; Germain, Marie; Gheata, Andrei George; Gheata, Mihaela; Ghosh, Premomoy; Ghosh, Sanjay Kumar; Gianotti, Paola; Giubellino, Paolo; Giubilato, Piero; Gladysz-Dziadus, Ewa; Glassel, Peter; Gomez Coral, Diego Mauricio; Gomez Ramirez, Andres; Sanchez Gonzalez, Andres; Gonzalez, Victor; Gonzalez Zamora, Pedro; Gorbunov, Sergey; Gorlich, Lidia Maria; Gotovac, Sven; Grabski, Varlen; Grachov, Oleg Anatolievich; Graczykowski, Lukasz Kamil; Graham, Katie Leanne; Grelli, Alessandro; Grigoras, Alina Gabriela; Grigoras, Costin; Grigoryev, Vladislav; Grigoryan, Ara; Grigoryan, Smbat; Grynyov, Borys; Grion, Nevio; Gronefeld, Julius Maximilian; Grosse-Oetringhaus, Jan Fiete; Grosso, Raffaele; Guber, Fedor; Guernane, Rachid; Guerzoni, Barbara; Gulbrandsen, Kristjan Herlache; Gunji, Taku; Gupta, Anik; Gupta, Ramni; Haake, Rudiger; Haaland, Oystein Senneset; Hadjidakis, Cynthia Marie; Haiduc, Maria; Hamagaki, Hideki; Hamar, Gergoe; Hamon, Julien Charles; Harris, John William; Harton, Austin Vincent; Hatzifotiadou, Despina; Hayashi, Shinichi; Heckel, Stefan Thomas; Hellbar, Ernst; Helstrup, Haavard; Herghelegiu, Andrei Ionut; Herrera Corral, Gerardo Antonio; Hess, Benjamin Andreas; Hetland, Kristin Fanebust; Hillemanns, Hartmut; Hippolyte, Boris; Horak, David; Hosokawa, Ritsuya; Hristov, Peter Zahariev; Humanic, Thomas; Hussain, Nur; Hussain, Tahir; Hutter, Dirk; Hwang, Dae Sung; Ilkaev, Radiy; Inaba, Motoi; Incani, Elisa; Ippolitov, Mikhail; Irfan, Muhammad; Ivanov, Marian; Ivanov, Vladimir; Izucheev, Vladimir; Jacazio, Nicolo; Jacobs, Peter Martin; Jadhav, Manoj Bhanudas; Jadlovska, Slavka; Jadlovsky, Jan; Jahnke, Cristiane; Jakubowska, Monika Joanna; Jang, Haeng Jin; Janik, Malgorzata Anna; Pahula Hewage, Sandun; Jena, Chitrasen; Jena, Satyajit; Jimenez Bustamante, Raul Tonatiuh; Jones, Peter Graham; Jusko, Anton; Kalinak, Peter; Kalweit, Alexander Philipp; Kamin, Jason Adrian; Kang, Ju Hwan; Kaplin, Vladimir; Kar, Somnath; Karasu Uysal, Ayben; Karavichev, Oleg; Karavicheva, Tatiana; Karayan, Lilit; Karpechev, Evgeny; Kebschull, Udo Wolfgang; Keidel, Ralf; Keijdener, Darius Laurens; Keil, Markus; Khan, Mohammed Mohisin; Khan, Palash; Khan, Shuaib Ahmad; Khanzadeev, Alexei; Kharlov, Yury; Kileng, Bjarte; Kim, Do Won; Kim, Dong Jo; Kim, Daehyeok; Kim, Hyeonjoong; Kim, Jinsook; Kim, Minwoo; Kim, Se Yong; Kim, Taesoo; Kirsch, Stefan; Kisel, Ivan; Kiselev, Sergey; Kisiel, Adam Ryszard; Kiss, Gabor; Klay, Jennifer Lynn; Klein, Carsten; Klein, Jochen; Klein-Boesing, Christian; Klewin, Sebastian; Kluge, Alexander; Knichel, Michael Linus; Knospe, Anders Garritt; Kobdaj, Chinorat; Kofarago, Monika; Kollegger, Thorsten; Kolozhvari, Anatoly; Kondratev, Valerii; Kondratyeva, Natalia; Kondratyuk, Evgeny; Konevskikh, Artem; Kopcik, Michal; Kostarakis, Panagiotis; Kour, Mandeep; Kouzinopoulos, Charalampos; Kovalenko, Oleksandr; Kovalenko, Vladimir; Kowalski, Marek; Koyithatta Meethaleveedu, Greeshma; Kralik, Ivan; Kravcakova, Adela; Krivda, Marian; Krizek, Filip; Kryshen, Evgeny; Krzewicki, Mikolaj; Kubera, Andrew Michael; Kucera, Vit; Kuhn, Christian Claude; Kuijer, Paulus Gerardus; Kumar, Ajay; Kumar, Jitendra; Kumar, Lokesh; Kumar, Shyam; Kurashvili, Podist; Kurepin, Alexander; Kurepin, Alexey; Kuryakin, Alexey; Kweon, Min Jung; Kwon, Youngil; La Pointe, Sarah Louise; La Rocca, Paola; Ladron De Guevara, Pedro; Lagana Fernandes, Caio; Lakomov, Igor; Langoy, Rune; Lara Martinez, Camilo Ernesto; Lardeux, Antoine Xavier; Lattuca, Alessandra; Laudi, Elisa; Lea, Ramona; Leardini, Lucia; Lee, Graham Richard; Lee, Seongjoo; Lehas, Fatiha; Lemmon, Roy Crawford; Lenti, Vito; Leogrande, Emilia; Leon Monzon, Ildefonso; Leon Vargas, Hermes; Leoncino, Marco; Levai, Peter; Li, Shuang; Li, Xiaomei; Lien, Jorgen Andre; Lietava, Roman; Lindal, Svein; Lindenstruth, Volker; Lippmann, Christian; Lisa, Michael Annan; Ljunggren, Hans Martin; Lodato, Davide Francesco; Lonne, Per-Ivar; Loginov, Vitaly; Loizides, Constantinos; Lopez, Xavier Bernard; Lopez Torres, Ernesto; Lowe, Andrew John; Luettig, Philipp Johannes; Lunardon, Marcello; Luparello, Grazia; Lutz, Tyler Harrison; Maevskaya, Alla; Mager, Magnus; Mahajan, Sanjay; Mahmood, Sohail Musa; Maire, Antonin; Majka, Richard Daniel; Malaev, Mikhail; Maldonado Cervantes, Ivonne Alicia; Malinina, Liudmila; Mal'Kevich, Dmitry; Malzacher, Peter; Mamonov, Alexander; Manko, Vladislav; Manso, Franck; Manzari, Vito; Marchisone, Massimiliano; Mares, Jiri; Margagliotti, Giacomo Vito; Margotti, Anselmo; Margutti, Jacopo; Marin, Ana Maria; Markert, Christina; Marquard, Marco; Martin, Nicole Alice; Martin Blanco, Javier; Martinengo, Paolo; Martinez Hernandez, Mario Ivan; Martinez-Garcia, Gines; Martinez Pedreira, Miguel; Mas, Alexis Jean-Michel; Masciocchi, Silvia; Masera, Massimo; Masoni, Alberto; Mastroserio, Annalisa; Matyja, Adam Tomasz; Mayer, Christoph; Mazer, Joel Anthony; Mazzoni, Alessandra Maria; Mcdonald, Daniel; Meddi, Franco; Melikyan, Yuri; Menchaca-Rocha, Arturo Alejandro; Meninno, Elisa; Mercado-Perez, Jorge; Meres, Michal; Miake, Yasuo; Mieskolainen, Matti Mikael; Mikhaylov, Konstantin; Milano, Leonardo; Milosevic, Jovan; Mischke, Andre; Mishra, Aditya Nath; Miskowiec, Dariusz Czeslaw; Mitra, Jubin; Mitu, Ciprian Mihai; Mohammadi, Naghmeh; Mohanty, Bedangadas; Molnar, Levente; Montano Zetina, Luis Manuel; Montes Prado, Esther; Moreira De Godoy, Denise Aparecida; Perez Moreno, Luis Alberto; Moretto, Sandra; Morreale, Astrid; Morsch, Andreas; Muccifora, Valeria; Mudnic, Eugen; Muhlheim, Daniel Michael; Muhuri, Sanjib; Mukherjee, Maitreyee; Mulligan, James Declan; Gameiro Munhoz, Marcelo; Munzer, Robert Helmut; Murakami, Hikari; Murray, Sean; Musa, Luciano; Musinsky, Jan; Naik, Bharati; Nair, Rahul; Nandi, Basanta Kumar; Nania, Rosario; Nappi, Eugenio; Naru, Muhammad Umair; Ferreira Natal Da Luz, Pedro Hugo; Nattrass, Christine; Rosado Navarro, Sebastian; Nayak, Kishora; Nayak, Ranjit; Nayak, Tapan Kumar; Nazarenko, Sergey; Nedosekin, Alexander; Nellen, Lukas; Ng, Fabian; Nicassio, Maria; Niculescu, Mihai; Niedziela, Jeremi; Nielsen, Borge Svane; Nikolaev, Sergey; Nikulin, Sergey; Nikulin, Vladimir; Noferini, Francesco; Nomokonov, Petr; Nooren, Gerardus; Cabanillas Noris, Juan Carlos; Norman, Jaime; Nyanin, Alexander; Nystrand, Joakim Ingemar; Oeschler, Helmut Oskar; Oh, Saehanseul; Oh, Sun Kun; Ohlson, Alice Elisabeth; Okatan, Ali; Okubo, Tsubasa; Olah, Laszlo; Oleniacz, Janusz; Oliveira Da Silva, Antonio Carlos; Oliver, Michael Henry; Onderwaater, Jacobus; Oppedisano, Chiara; Orava, Risto; Oravec, Matej; Ortiz Velasquez, Antonio; Oskarsson, Anders Nils Erik; Otwinowski, Jacek Tomasz; Oyama, Ken; Ozdemir, Mahmut; Pachmayer, Yvonne Chiara; Pagano, Davide; Pagano, Paola; Paic, Guy; Pal, Susanta Kumar; Pan, Jinjin; Pandey, Ashutosh Kumar; Papikyan, Vardanush; Pappalardo, Giuseppe; Pareek, Pooja; Park, Woojin; Parmar, Sonia; Passfeld, Annika; Paticchio, Vincenzo; Patra, Rajendra Nath; Paul, Biswarup; Pei, Hua; Peitzmann, Thomas; Pereira Da Costa, Hugo Denis Antonio; Peresunko, Dmitry Yurevich; Perez Lara, Carlos Eugenio; Perez Lezama, Edgar; Peskov, Vladimir; Pestov, Yury; Petracek, Vojtech; Petrov, Viacheslav; Petrovici, Mihai; Petta, Catia; Piano, Stefano; Pikna, Miroslav; Pillot, Philippe; Ozelin De Lima Pimentel, Lais; Pinazza, Ombretta; Pinsky, Lawrence; Piyarathna, Danthasinghe; Ploskon, Mateusz Andrzej; Planinic, Mirko; Pluta, Jan Marian; Pochybova, Sona; Podesta Lerma, Pedro Luis Manuel; Poghosyan, Martin; Polishchuk, Boris; Poljak, Nikola; Poonsawat, Wanchaloem; Pop, Amalia; Porteboeuf, Sarah Julie; Porter, R Jefferson; Pospisil, Jan; Prasad, Sidharth Kumar; Preghenella, Roberto; Prino, Francesco; Pruneau, Claude Andre; Pshenichnov, Igor; Puccio, Maximiliano; Puddu, Giovanna; Pujahari, Prabhat Ranjan; Punin, Valery; Putschke, Jorn Henning; Qvigstad, Henrik; Rachevski, Alexandre; Raha, Sibaji; Rajput, Sonia; Rak, Jan; Rakotozafindrabe, Andry Malala; Ramello, Luciano; Rami, Fouad; Raniwala, Rashmi; Raniwala, Sudhir; Rasanen, Sami Sakari; Rascanu, Bogdan Theodor; Rathee, Deepika; Read, Kenneth Francis; Redlich, Krzysztof; Reed, Rosi Jan; Rehman, Attiq Ur; Reichelt, Patrick Simon; Reidt, Felix; Ren, Xiaowen; Renfordt, Rainer Arno Ernst; Reolon, Anna Rita; Reshetin, Andrey; Reygers, Klaus Johannes; Riabov, Viktor; Ricci, Renato Angelo; Richert, Tuva Ora Herenui; Richter, Matthias Rudolph; Riedler, Petra; Riegler, Werner; Riggi, Francesco; Ristea, Catalin-Lucian; Rocco, Elena; Rodriguez Cahuantzi, Mario; Rodriguez Manso, Alis; Roeed, Ketil; Rogochaya, Elena; Rohr, David Michael; Roehrich, Dieter; Ronchetti, Federico; Ronflette, Lucile; Rosnet, Philippe; Rossi, Andrea; Roukoutakis, Filimon; Roy, Ankhi; Roy, Christelle Sophie; Roy, Pradip Kumar; Rubio Montero, Antonio Juan; Rui, Rinaldo; Russo, Riccardo; Ryabinkin, Evgeny; Ryabov, Yury; Rybicki, Andrzej; Saarinen, Sampo; Sadhu, Samrangy; Sadovskiy, Sergey; Safarik, Karel; Sahlmuller, Baldo; Sahoo, Pragati; Sahoo, Raghunath; Sahoo, Sarita; Sahu, Pradip Kumar; Saini, Jogender; Sakai, Shingo; Saleh, Mohammad Ahmad; Salzwedel, Jai Samuel Nielsen; Sambyal, Sanjeev Singh; Samsonov, Vladimir; Sandor, Ladislav; Sandoval, Andres; Sano, Masato; Sarkar, Debojit; Sarkar, Nachiketa; Sarma, Pranjal; Scapparone, Eugenio; Scarlassara, Fernando; Schiaua, Claudiu Cornel; Schicker, Rainer Martin; Schmidt, Christian Joachim; Schmidt, Hans Rudolf; Schuchmann, Simone; Schukraft, Jurgen; Schulc, Martin; Schutz, Yves Roland; Schwarz, Kilian Eberhard; Schweda, Kai Oliver; Scioli, Gilda; Scomparin, Enrico; Scott, Rebecca Michelle; Sefcik, Michal; Seger, Janet Elizabeth; Sekiguchi, Yuko; Sekihata, Daiki; Selyuzhenkov, Ilya; Senosi, Kgotlaesele; Senyukov, Serhiy; Serradilla Rodriguez, Eulogio; Sevcenco, Adrian; Shabanov, Arseniy; Shabetai, Alexandre; Shadura, Oksana; Shahoyan, Ruben; Shahzad, Muhammed Ikram; Shangaraev, Artem; Sharma, Ankita; Sharma, Mona; Sharma, Monika; Sharma, Natasha; Sheikh, Ashik Ikbal; Shigaki, Kenta; Shou, Qiye; Shtejer Diaz, Katherin; Sibiryak, Yury; Siddhanta, Sabyasachi; Sielewicz, Krzysztof Marek; Siemiarczuk, Teodor; Silvermyr, David Olle Rickard; Silvestre, Catherine Micaela; Simatovic, Goran; Simonetti, Giuseppe; Singaraju, Rama Narayana; Singh, Ranbir; Singha, Subhash; Singhal, Vikas; Sinha, Bikash; Sarkar - Sinha, Tinku; Sitar, Branislav; Sitta, Mario; Skaali, Bernhard; Slupecki, Maciej; Smirnov, Nikolai; Snellings, Raimond; Snellman, Tomas Wilhelm; Song, Jihye; Song, Myunggeun; Song, Zixuan; Soramel, Francesca; Sorensen, Soren Pontoppidan; Derradi De Souza, Rafael; Sozzi, Federica; Spacek, Michal; Spiriti, Eleuterio; Sputowska, Iwona Anna; Spyropoulou-Stassinaki, Martha; Stachel, Johanna; Stan, Ionel; Stankus, Paul; Stenlund, Evert Anders; Steyn, Gideon Francois; Stiller, Johannes Hendrik; Stocco, Diego; Strmen, Peter; Alarcon Do Passo Suaide, Alexandre; Sugitate, Toru; Suire, Christophe Pierre; Suleymanov, Mais Kazim Oglu; Suljic, Miljenko; Sultanov, Rishat; Sumbera, Michal; Sumowidagdo, Suharyo; Szabo, Alexander; Szanto De Toledo, Alejandro; Szarka, Imrich; Szczepankiewicz, Adam; Szymanski, Maciej Pawel; Tabassam, Uzma; Takahashi, Jun; Tambave, Ganesh Jagannath; Tanaka, Naoto; Tarhini, Mohamad; Tariq, Mohammad; Tarzila, Madalina-Gabriela; Tauro, Arturo; Tejeda Munoz, Guillermo; Telesca, Adriana; Terasaki, Kohei; Terrevoli, Cristina; Teyssier, Boris; Thaeder, Jochen Mathias; Thakur, Dhananjaya; Thomas, Deepa; Tieulent, Raphael Noel; Timmins, Anthony Robert; Toia, Alberica; Trogolo, Stefano; Trombetta, Giuseppe; Trubnikov, Victor; Trzaska, Wladyslaw Henryk; Tsuji, Tomoya; Tumkin, Alexandr; Turrisi, Rosario; Tveter, Trine Spedstad; Ullaland, Kjetil; Uras, Antonio; Usai, Gianluca; Utrobicic, Antonija; Vala, Martin; Valencia Palomo, Lizardo; Vallero, Sara; Van Der Maarel, Jasper; Van Hoorne, Jacobus Willem; Van Leeuwen, Marco; Vanat, Tomas; Vande Vyvre, Pierre; Varga, Dezso; Vargas Trevino, Aurora Diozcora; Vargyas, Marton; Varma, Raghava; Vasileiou, Maria; Vasiliev, Andrey; Vauthier, Astrid; Vechernin, Vladimir; Veen, Annelies Marianne; Veldhoen, Misha; Velure, Arild; Vercellin, Ermanno; Vergara Limon, Sergio; Vernet, Renaud; Verweij, Marta; Vickovic, Linda; Viesti, Giuseppe; Viinikainen, Jussi Samuli; Vilakazi, Zabulon; Villalobos Baillie, Orlando; Villatoro Tello, Abraham; Vinogradov, Alexander; Vinogradov, Leonid; Vinogradov, Yury; Virgili, Tiziano; Vislavicius, Vytautas; Viyogi, Yogendra; Vodopyanov, Alexander; Volkl, Martin Andreas; Voloshin, Kirill; Voloshin, Sergey; Volpe, Giacomo; Von Haller, Barthelemy; Vorobyev, Ivan; Vranic, Danilo; Vrlakova, Janka; Vulpescu, Bogdan; Wagner, Boris; Wagner, Jan; Wang, Hongkai; Wang, Mengliang; Watanabe, Daisuke; Watanabe, Yosuke; Weber, Michael; Weber, Steffen Georg; Weiser, Dennis Franz; Wessels, Johannes Peter; Westerhoff, Uwe; Whitehead, Andile Mothegi; Wiechula, Jens; Wikne, Jon; Wilk, Grzegorz Andrzej; Wilkinson, Jeremy John; Williams, Crispin; Windelband, Bernd Stefan; Winn, Michael Andreas; Yang, Hongyan; Yang, Ping; Yano, Satoshi; Yasin, Zafar; Yin, Zhongbao; Yokoyama, Hiroki; Yoo, In-Kwon; Yoon, Jin Hee; Yurchenko, Volodymyr; Yushmanov, Igor; Zaborowska, Anna; Zaccolo, Valentina; Zaman, Ali; Zampolli, Chiara; Correia Zanoli, Henrique Jose; Zaporozhets, Sergey; Zardoshti, Nima; Zarochentsev, Andrey; Zavada, Petr; Zavyalov, Nikolay; Zbroszczyk, Hanna Paulina; Zgura, Sorin Ion; Zhalov, Mikhail; Zhang, Haitao; Zhang, Xiaoming; Zhang, Yonghong; Chunhui, Zhang; Zhang, Zuman; Zhao, Chengxin; Zhigareva, Natalia; Zhou, Daicui; Zhou, You; Zhou, Zhuo; Zhu, Hongsheng; Zhu, Jianhui; Zichichi, Antonino; Zimmermann, Alice; Zimmermann, Markus Bernhard; Zinovjev, Gennady; Zyzak, Maksym

    2016-01-01

    We present a Bayesian approach to particle identification (PID) within the ALICE experiment. The aim is to more effectively combine the particle identification capabilities of its various detectors. After a brief explanation of the adopted methodology and formalism, the performance of the Bayesian PID approach for charged pions, kaons and protons in the central barrel of ALICE is studied. PID is performed via measurements of specific energy loss (dE/dx) and time-of-flight. PID efficiencies and misidentification probabilities are extracted and compared with Monte Carlo simulations using high purity samples of identified particles in the decay channels ${\\rm K}_{\\rm S}^{\\rm 0}\\rightarrow \\pi^+\\pi^-$, $\\phi\\rightarrow {\\rm K}^-{\\rm K}^+$ and $\\Lambda\\rightarrow{\\rm p}\\pi^-$ in p–Pb collisions at $\\sqrt{s_{\\rm NN}}= 5.02$TeV. In order to thoroughly assess the validity of the Bayesian approach, this methodology was used to obtain corrected $p_{\\rm T}$ spectra of pions, kaons, protons, and D$^0$ mesons in pp coll...

  19. Enhanced trigger for the NIFFTE fissionTPC in presence of high-rate alpha backgrounds

    Science.gov (United States)

    Bundgaard, Jeremy; Niffte Collaboration

    2015-10-01

    Nuclear physics and nuclear energy communities call for new, high precision measurements to improve existing fission models and design next generation reactors. The Neutron Induced Fission Fragment Tracking experiment (NIFFTE) has developed the fission Time Projection Chamber (fissionTPC) to measure neutron induced fission with unrivaled precision. The fissionTPC is annually deployed to the Weapons Neutron Research facility at Los Alamos Neutron Science Center where it operates with a neutron beam passing axially through the drift volume, irradiating heavy actinide targets to induce fission. The fissionTPC was developed at the Lawrence Livermore National Laboratory's TPC lab, where it measures spontaneous fission from radioactive sources to characterize detector response, improve performance, and evolve the design. To measure 244Cm, we've developed a fission trigger to reduce the data rate from alpha tracks while maintaining a high fission detection efficiency. In beam, alphas from 239Pu are a large background when detecting fission fragments; implementing the fission trigger will greatly reduce this background. The implementation of the cathode fission trigger in the fissionTPC will be presented along with a detailed study of its efficiency.

  20. Heavy-flavour measurements in p-Pb collisions with ALICE at the LHC arXiv

    CERN Document Server

    Kumar, Jitendra

    The measurements of open heavy-flavours, i.e. D mesons at central rapidity and leptons from charm and beauty decays at central and forward rapidity was studied in p-Pb collisions at $\\sqrt{s_{{\\rm{NN}}}}$ = 5.02 TeV using the ALICE detector. The results are presented and compared to model predictions including cold nuclear matter effects.

  1. Trigger electronics for the ALICE PHOS detector

    CERN Document Server

    Müller, H; Musa, L; Yin, Z; Röhrich, D; Skaali, B; Sibiryak, Yu; Budnikov, D L

    2004-01-01

    The Photon Spectrometer of ALICE consists of 5 identical modules of 56 multiplied by 64 PWO crystals with a total of 100 degree azimuthal coverage of the barrel. The electronics required for implementing both the L0 trigger for high luminosity p-p physics and the L1 trigger for high p//T Pb+Pb physics has been studied. A full integration of the trigger logic into the detector's enclosure is based on analog transmission of fast trigger sums between stacks of front-end boards and trigger-router units. The latter contain 112 digitizer channels of 10bit, which are mapped into a single FPGA per trigger unit, covering areas of 24 multiplied by 16 crystals. The running modes allow for Level-0 trigger at 800ns and Level-1 at 6200ns trigger latencies. The design and status of the PHOS trigger electronics are outlined.

  2. ALICE & LHCb: refinements for the restart

    CERN Document Server

    2009-01-01

    Following the previous issue, the Bulletin continues its series to find out what the six LHC experiments have been up to since last September, and how they are preparing for the restart. Previously we looked at CMS and ATLAS; this issue we will round up the past 10 months of activity at ALICE and LHCb. LHCb The cavern of the LHCb experiment. This year has given LHCb the chance to install the 5th and final plane of muon chambers, which will improve the triggering at nominal luminosity. This is the final piece of the experiment to be installed. "Now the detector looks exactly as it does in the technical design report," confirms Andrei Golutvin, LHCb Spokesperson. "We also took advantage of this shutdown to make several improvements. For example, we modified the high voltage system of the electromagnetic calorimeter to reduce noise further to a negligible level. We also took some measures to improve ...

  3. Timing in the ALICE trigger system

    CERN Document Server

    Lietava, Roman; Evans, D; Jones, G T; Jovanovic, P; Jusko, A; Králik, I; Krivda, M; Pastircák, B; Sándor, L; Urbán, J; Villalobos Baillie, O

    2007-01-01

    In this paper we discuss trigger signals synchronisation and trigger input alignment in the ALICE trigger system. The synchronisation procedure adjusts the phase of the input signals with respect to the local Bunch Crossing (BC) clock and, indirectly, with respect to the LHC bunch crossing instant. The synchronisation delays are within one clock period: 0-25 ns. The alignment assures that the trigger signals originating from the same bunch crossing reach the processor logic in the same clock cycle. It is achieved by delaying signals by an appropriate number of full clock periods. We propose a procedure which will allow us to nd alignment delays during the system con guration, and to monitor them during the data taking.

  4. Jet measurements by ALICE at LHC

    Energy Technology Data Exchange (ETDEWEB)

    Sultanov, Rishat, E-mail: rishat.sultanov@cern.ch [National Research Centre Kurchatov Institute, Alikhanov Institute for Theoretical and Experimental Physics (Russian Federation); Collaboration: ALICE Collaboration

    2015-12-15

    Jets are collimated sprays of particles originating from fragmentation of high energy partons produced in a hard collision. They are an important diagnostic tool in studies of the Quark Gluon Plasma (QGP). The modification of the jet fragmentation pattern and its structure is a signature for the influence of hot and dense matter on the parton fragmentation process. Jet measurements in proton-proton collisions provide a baseline for similar measurements in heavy-ion collisions, while studies in proton-nucleus system allow to estimate cold nuclear matter effects. Here we present jet studies in different colliding systems (p–p, p–Pb, Pb–Pb) performed by the ALICE collaboration at LHC energies. Results on jet spectra, cross sections, nuclear modification factors, jet structure and other kinematic observables will be presented.

  5. Recent ALICE results on hadronic resonance production

    CERN Document Server

    Badalà, Angela

    2015-01-01

    Hadronic resonances are a valuable tool to study the properties of the medium formed in heavy-ion collisions. In particular, they can provide information on particle-formation mechanisms and on the properties of the medium at chemical freeze-out. Furthermore they contribute to the systematic study of parton energy loss and quark recombination. Measurements of resonances in pp and in p-Pb collisions provide a necessary baseline for heavy-ion data and help to disentangle initial-state effects from medium-induced effects. In this paper the latest ALICE results on mid-rapidity K*(892)^0 and {\\phi}(1020) production in pp, p-Pb and Pb-Pb collisions at LHC energies are presented

  6. Heavy flavour measurements with ALICE at the LHC

    Energy Technology Data Exchange (ETDEWEB)

    Castillo Castellanos, Javier [service de physique nucleaire - SPhN, IRFU, CEA-Saclay, 91191 Gif-sur-Yvette Cedex (France)

    2010-07-01

    ALICE is the LHC experiment dedicated to the study of heavy-ion collisions. The main purpose of ALICE is to investigate the properties of a state of deconfined nuclear matter, the Quark Gluon Plasma. Heavy flavour measurements will play a crucial role in this investigation. The physics programme of ALICE has started by studying proton-proton collisions at unprecedented high energies. We will present the first results on open heavy flavour and quarkonia in proton-proton collisions at {radical}(s)=7 TeV measured by the ALICE experiment at both mid- and forward-rapidities. We will conclude with the prospects for heavy flavour and quarkonium measurements in both proton-proton and nucleus-nucleus collisions. (author)

  7. ALICE installs new hardware in preparation for the 2012 run

    CERN Multimedia

    CERN Bulletin and ALICE Matters

    2012-01-01

    2011 was a fantastic year for the heavy-ion run at ALICE despite unprecedented challenges and difficult conditions. The data collected is at least one order of magnitude greater than the 2010 data. Thanks to a planned upgrade to two subdetectors during the 2011/2012 winter shutdown and a reorganisation of ALICE’s Physics Working Groups that should allow them to better deal with the greater challenges imposed by the LHC, the collaboration is confident that the 2011 run will allow ALICE to extend its physics reach and improve its performance.   Photograph of ALICE taken by Antonio Saba during this year's winter shutdown. The annual winter shutdown has been a very intense period for the ALICE collaboration. In conjunction with the general maintenance, modifications and tests of the experiment, two major projects – the installation of 3 supermodules of the Transition Radiation Detector (TRD) and 2 supermodules of the Electromagnetic Calorimeter (EMCal) – hav...

  8. Sampling Lake Alice NWR Fish Populations - 2014, North Dakota

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — The USFWS and North Dakota Game and Fish Department sampled Northern pike, walleye, yellow perch and white bass within the boundary of Lake Alice NWR in North...

  9. Intrajet radiation study with the ALICE experiment at LHC

    Energy Technology Data Exchange (ETDEWEB)

    Jangal, Swensy, E-mail: swensy.jangal@ires.in2p3.fr [IPHC, 23 rue du Loess-BP 28, 67037 STRASBOURG cedex 2 (France)

    2011-01-01

    The ALICE collaboration is interested in measuring the {xi} ln(p{sup jet}{sub T}/p{sup hadron}{sub T}) distribution of hadrons in jets known as the Hump-backed plateau (HBP). After an introduction to color coherence effects responsible for the shape of the HBP, we discuss the ALICE capabilities to perform such a study. Preliminary results from ALICE for non corrected charged particle and jet spectra measurement in p+p collisions at {radical}s = 900 GeV and 7 TeV are presented. Finally, we show the results of a MC based analysis of intrajet radiations. It supports the idea of jet collimation which increases with increasing jet energy as expected from QCD and show the feasability of this study with ALICE.

  10. Upgrade of the ALICE Inner Tracking System

    Science.gov (United States)

    Riedler, P.

    2016-12-01

    During the long shutdown of the Large Hadron Collider (LHC) in 2019-20 (LS2) the present Inner Tracking System (ITS) of the ALICE experiment based on silicon pixel, silicon drift and silicon strip detectors, will be entirely replaced by a new tracker using novel monolithic silicon pixel chips. This new tracker will significantly enhance heavy flavour measurements, which are out of reach for the present system, e.g. charmed baryons, such as the ΛC, and will allow studying hadrons containing a beauty quark. The new tracker will provide an improved pointing resolution in rϕ and z, decreasing the present values by a factor 3 and 5, respectively, to about 40 μm for a pT of 500 MeV/c. Each of the seven layers will be constructed using 50 μm, respectively 100 μm thin silicon chips on a very light weight carbon fibre based support structure for the innermost and the outer layers. The material budget for the first three layers corresponds to 0.3% X0/layer while the four outer layers will have an average material budget of 1% X0/layer. The innermost layer will be placed at 23 mm radius, compared to presently 39 mm. Furthermore, the readout rate of the new ITS will increase from presently 1 kHz to 50 kHz for Pb-Pb collisions and 400 kHz for p-p collisions, thus matching the expected event rate for Pb-Pb collisions after LS2. This contribution will provide an overview of the upgrade of the ALICE ITS and the expected performance improvement and will present the actual status of the R&D.

  11. Analysis of the liquid argon purity in the ICARUS T600 TPC

    Energy Technology Data Exchange (ETDEWEB)

    Amoruso, S.; Antonello, M.; Aprili, P.; Arneodo, F.; Badertscher, A.; Baiboussinov, B.; Baldo Ceolin, M.; Battistoni, G.; Bekman, B.; Benetti, P.; Bernardini, E.; Bischofberger, M.; Borio di Tigliole, A.; Brunetti, R.; Bruzzese, R.; Bueno, A.; Buzzanca, M.; Calligarich, E.; Campanelli, M.; Carbonara, F.; Carpanese, C.; Cavalli, D.; Cavanna, F.; Cennini, P.; Centro, S.; Cesana, A.; Chen, C.; Chen, D.; Chen, D.B.; Chen, Y.; Cieslik, X.; Cline, D.; Cocco, A.G.; Dai, Z.; De Vecchi, C.; Dabrowska, A.; Di Cicco, A.; Dolfini, R.; Ereditato, A.; Felcini, M.; Ferrari, A.; Ferri, F.; Fiorillo, G.; Galli, S.; Ge, Y.; Gibin, D.; Gigli Berzolari, A.; Gil-Botella, I.; Graczyk, K.; Grandi, L.; Guglielmi, A.; He, K.; Holeczek, J.; Huang, X.; Juszczak, C.; Kielczewska, D.; Kisiel, J.; Kozlowski, T.; Laffranchi, M.; Lagoda, J.; Li, Z.; Lu, F.; Ma, J.; Mangano, G.; Markiewicz, M.; Martinez de la Ossa, A.; Matthey, C.; Mauri, F.; Meng, G.; Messina, M.; Montanari, C.; Muraro, S.; Navas-Concha, S. E-mail: navas@ugr.es; Nurzia, G.; Otwinowski, S.; Ouyang, Q.; Palamara, O.; Pascoli, D.; Periale, L.; Piano Mortari, G.B.; Piazzoli, A.; Picchi, P.; Pietropaolo, F.; Polchlopek, W.; Rancati, T.; Rappoldi, A.; Raselli, G.L.; Rico, J.; Rondio, E.; Rossella, M.; Rubbia, A.; Rubbia, C.; Sala, P.; Santorelli, R.; Scannicchio, D.; Segreto, E.; Seo, Y.; Sergiampietri, F.; Sobczyk, J.; Spinelli, N.; Stepaniak, J.; Szarska, M.; Szeptycka, M.; Szleper, M.; Terrani, M.; Velotta, R.; Ventura, S.; Vignoli, C.; Wang, H.; Wang, X.; Woo, J.; Xu, G.; Xu, Z.; Zalewska, A.; Zalipska, J.; Zhang, C.; Zhang, Q.; Zhen, S.; Zipper, W

    2004-01-01

    The results reported in this paper are based on the analysis of the data recorded with the first half-module of the ICARUS T600 liquid argon Time Projection Chamber (LAr TPC), during a technical run that took place on surface in Pavia (Italy). We include results from the linearity, uniformity and calibration of the electronics, measurements on the electron drift velocity in LAr at different electric fields, as well as the LAr purity achievement of the detector. Two complementary techniques were used to measure the drift electron lifetime inside the active volume: the first, from the data of a purity monitor, gives a measurement localized in space; the second, based on the study of the signals produced by long minimum ionizing tracks crossing the detector, provides a LAr volume averaged value. Both methods yield consistent results over the whole data taking period and are compatible with an uniform LAr purity over the whole volume. The maximal drift electron lifetime value was recorded before the run stop and was about 1.8 ms. From an interpretation of the observed drift electron lifetime as a function of time, we conclude that the adopted technology would allow for drift distances exceeding 3 m.

  12. ALICE takes root in Saint-Genis-Pouilly

    CERN Multimedia

    Patrice Loiez

    2004-01-01

    To celebrate the CERN 50th anniversary and to emphasize the close ties between the community of Saint-Genis-Pouilly, CERN and the ALICE Collaboration, Hubert Bertrand, Mayor of Saint-Genis-Pouilly and Christian Fabjan, Technical Coordinator of the ALICE Experiment, planted a tree on Saturday 16 October 2004 in front of the Jean Monet Culture Center.

  13. ALICE takes root in Saint-Genis-Pouilly

    CERN Multimedia

    2004-01-01

    To celebrate the CERN 50th anniversary and to emphasize the close ties between the community of Saint-Genis-Pouilly, CERN and the ALICE Collaboration, Hubert Bertrand, Mayor of Saint-Genis-Pouilly and Christian Fabjan, Technical Coordinator of the ALICE Experiment, planted a tree on Saturday 16 October 2004 in front of the Jean Monet Culture Center.

  14. ALICE's main austenitic stainless steel support structure (the Space Frame)

    CERN Multimedia

    Maximilien Brice

    2006-01-01

    This structure is constructed to hold the large volume detectors, such as the Time Projection Chamber, Transition Radiation Detector and Time of Flight inside the ALICE solenoid magnet. After the final assembly at CERN, two large mobile cranes were needed for the job of lifting and turning the 14 tonne frame onto its side. Once shifted, it was placed in Building SX2, one of the surface assembly areas designated for ALICE.

  15. Performance of the ALICE Experiment at the CERN LHC

    CERN Document Server

    Abelev, Betty Bezverkhny; Adam, Jaroslav; Adamova, Dagmar; Aggarwal, Madan Mohan; Agnello, Michelangelo; Agostinelli, Andrea; Agrawal, Neelima; Ahammed, Zubayer; Ahmad, Nazeer; Ahmad, Arshad; Ahmed, Ijaz; Ahn, Sang Un; Ahn, Sul-Ah; Aimo, Ilaria; Aiola, Salvatore; Ajaz, Muhammad; Akindinov, Alexander; Aleksandrov, Dmitry; Alessandro, Bruno; Alexandre, Didier; Alici, Andrea; Alkin, Anton; Alme, Johan; Alt, Torsten; Altini, Valerio; Altinpinar, Sedat; Altsybeev, Igor; Alves Garcia Prado, Caio; Andrei, Cristian; Andronic, Anton; Anguelov, Venelin; Anielski, Jonas; Anticic, Tome; Antinori, Federico; Antonioli, Pietro; Aphecetche, Laurent Bernard; Appelshaeuser, Harald; Arbor, Nicolas; Arcelli, Silvia; Armesto Perez, Nestor; Arnaldi, Roberta; Aronsson, Tomas; Arsene, Ionut Cristian; Arslandok, Mesut; Augustinus, Andre; Averbeck, Ralf Peter; Awes, Terry; Azmi, Mohd Danish; Bach, Matthias Jakob; Badala, Angela; Baek, Yong Wook; Bagnasco, Stefano; Bailhache, Raphaelle Marie; Bala, Renu; Baldisseri, Alberto; Baltasar Dos Santos Pedrosa, Fernando; Baral, Rama Chandra; Barbera, Roberto; Barile, Francesco; Barnafoldi, Gergely Gabor; Barnby, Lee Stuart; Ramillien Barret, Valerie; Bartke, Jerzy Gustaw; Basile, Maurizio; Bastid, Nicole; Basu, Sumit; Bathen, Bastian; Batigne, Guillaume; Batyunya, Boris; Batzing, Paul Christoph; Baumann, Christoph Heinrich; Bearden, Ian Gardner; Beck, Hans; Bedda, Cristina; Behera, Nirbhay Kumar; Belikov, Iouri; Bellini, Francesca; Bellwied, Rene; Belmont Moreno, Ernesto; Bencedi, Gyula; Beole, Stefania; Berceanu, Ionela; Bercuci, Alexandru; Berdnikov, Yaroslav; Berenyi, Daniel; Berger, Martin Emanuel; Bertens, Redmer Alexander; Berzano, Dario; Betev, Latchezar; Bhasin, Anju; Bhati, Ashok Kumar; Bhattacharjee, Buddhadeb; Bhom, Jihyun; Bianchi, Livio; Bianchi, Nicola; Bianchin, Chiara; Bielcik, Jaroslav; Bielcikova, Jana; Bilandzic, Ante; Bjelogrlic, Sandro; Blanco, Fernando; Blau, Dmitry; Blume, Christoph; Bock, Friederike; Bogdanov, Alexey; Boggild, Hans; Bogolyubskiy, Mikhail; Boehmer, Felix Valentin; Boldizsar, Laszlo; Bombara, Marek; Book, Julian Heinz; Borel, Herve; Borissov, Alexander; Bossu, Francesco; Botje, Michiel; Botta, Elena; Boettger, Stefan; Braun-Munzinger, Peter; Bregant, Marco; Breitner, Timo Gunther; Broker, Theo Alexander; Browning, Tyler Allen; Broz, Michal; Bruna, Elena; Bruno, Giuseppe Eugenio; Budnikov, Dmitry; Buesching, Henner; Bufalino, Stefania; Buncic, Predrag; Busch, Oliver; Buthelezi, Edith Zinhle; Caffarri, Davide; Cai, Xu; Caines, Helen Louise; Caliva, Alberto; Calvo Villar, Ernesto; Camerini, Paolo; Canoa Roman, Veronica; Carena, Francesco; Carena, Wisla; Castillo Castellanos, Javier Ernesto; Casula, Ester Anna Rita; Catanescu, Vasile Ioan; Cavicchioli, Costanza; Ceballos Sanchez, Cesar; Cepila, Jan; Cerello, Piergiorgio; Chang, Beomsu; Chapeland, Sylvain; Charvet, Jean-Luc Fernand; Chattopadhyay, Subhasis; Chattopadhyay, Sukalyan; Cherney, Michael Gerard; Cheshkov, Cvetan Valeriev; Cheynis, Brigitte; Chibante Barroso, Vasco Miguel; Dobrigkeit Chinellato, David; Chochula, Peter; Chojnacki, Marek; Choudhury, Subikash; Christakoglou, Panagiotis; Christensen, Christian Holm; Christiansen, Peter; Chujo, Tatsuya; Chung, Suh-Urk; Cicalo, Corrado; Cifarelli, Luisa; Cindolo, Federico; Cleymans, Jean Willy Andre; Colamaria, Fabio Filippo; Colella, Domenico; Collu, Alberto; Colocci, Manuel; Conesa Balbastre, Gustavo; Conesa Del Valle, Zaida; Connors, Megan Elizabeth; Contreras Nuno, Jesus Guillermo; Cormier, Thomas Michael; Corrales Morales, Yasser; Cortese, Pietro; Cortes Maldonado, Ismael; Cosentino, Mauro Rogerio; Costa, Filippo; Crochet, Philippe; Cruz Albino, Rigoberto; Cuautle Flores, Eleazar; Cunqueiro Mendez, Leticia; Dainese, Andrea; Dang, Ruina; Danu, Andrea; Das, Debasish; Das, Indranil; Das, Kushal; Das, Supriya; Dash, Ajay Kumar; Dash, Sadhana; De, Sudipan; Delagrange, Hugues; Deloff, Andrzej; Denes, Ervin Sandor; D'Erasmo, Ginevra; De Caro, Annalisa; De Cataldo, Giacinto; De Cuveland, Jan; De Falco, Alessandro; De Gruttola, Daniele; De Marco, Nora; De Pasquale, Salvatore; De Rooij, Raoul Stefan; Diaz Corchero, Miguel Angel; Dietel, Thomas; Divia, Roberto; Di Bari, Domenico; Di Liberto, Sergio; Di Mauro, Antonio; Di Nezza, Pasquale; Djuvsland, Oeystein; Dobrin, Alexandru Florin; Dobrowolski, Tadeusz Antoni; Domenicis Gimenez, Diogenes; Donigus, Benjamin; Dordic, Olja; Dorheim, Sverre; Dubey, Anand Kumar; Dubla, Andrea; Ducroux, Laurent; Dupieux, Pascal; Dutt Mazumder, Abhee Kanti; Ehlers Iii, Raymond James; Elia, Domenico; Engel, Heiko; Erazmus, Barbara Ewa; Erdal, Hege Austrheim; Eschweiler, Dominic; Espagnon, Bruno; Esposito, Marco; Estienne, Magali Danielle; Esumi, Shinichi; Evans, David; Evdokimov, Sergey; Fabris, Daniela; Faivre, Julien; Falchieri, Davide; Fantoni, Alessandra; Fasel, Markus; Fehlker, Dominik; Feldkamp, Linus; Felea, Daniel; Feliciello, Alessandro; Feofilov, Grigory; Ferencei, Jozef; Fernandez Tellez, Arturo; Gonzalez Ferreiro, Elena; Ferretti, Alessandro; Festanti, Andrea; Figiel, Jan; Araujo Silva Figueredo, Marcel; Filchagin, Sergey; Finogeev, Dmitry; Fionda, Fiorella; Fiore, Enrichetta Maria; Floratos, Emmanouil; Floris, Michele; Foertsch, Siegfried Valentin; Foka, Panagiota; Fokin, Sergey; Fragiacomo, Enrico; Francescon, Andrea; Frankenfeld, Ulrich Michael; Fuchs, Ulrich; Furget, Christophe; Fusco Girard, Mario; Gaardhoeje, Jens Joergen; Gagliardi, Martino; Gago Medina, Alberto Martin; Gallio, Mauro; Gangadharan, Dhevan Raja; Ganoti, Paraskevi; Garabatos Cuadrado, Jose; Garcia-Solis, Edmundo Javier; Gargiulo, Corrado; Garishvili, Irakli; Gerhard, Jochen; Germain, Marie; Gheata, Andrei George; Gheata, Mihaela; Ghidini, Bruno; Ghosh, Premomoy; Ghosh, Sanjay Kumar; Gianotti, Paola; Giubellino, Paolo; Gladysz-Dziadus, Ewa; Glassel, Peter; Gomez Jimenez, Ramon; Gomez Ramirez, Andres; Gonzalez Zamora, Pedro; Gorbunov, Sergey; Gorlich, Lidia Maria; Gotovac, Sven; Graczykowski, Lukasz Kamil; Grajcarek, Robert; Grelli, Alessandro; Grigoras, Alina Gabriela; Grigoras, Costin; Grigoryev, Vladislav; Grigoryan, Ara; Grigoryan, Smbat; Grynyov, Borys; Grion, Nevio; Grosse-Oetringhaus, Jan Fiete; Grossiord, Jean-Yves; Grosso, Raffaele; Guber, Fedor; Guernane, Rachid; Guerzoni, Barbara; Guilbaud, Maxime Rene Joseph; Gulbrandsen, Kristjan Herlache; Gulkanyan, Hrant; Gunji, Taku; Gupta, Anik; Gupta, Ramni; Khan, Kamal; Haake, Rudiger; Haaland, Oystein Senneset; Hadjidakis, Cynthia Marie; Haiduc, Maria; Hamagaki, Hideki; Hamar, Gergoe; Hanratty, Luke David; Hansen, Alexander; Harris, John William; Hartmann, Helvi; Harton, Austin Vincent; Hatzifotiadou, Despina; Hayashi, Shinichi; Heckel, Stefan Thomas; Heide, Markus Ansgar; Helstrup, Haavard; Herghelegiu, Andrei Ionut; Herrera Corral, Gerardo Antonio; Hess, Benjamin Andreas; Hetland, Kristin Fanebust; Hicks, Bernard Richard; Hippolyte, Boris; Hladky, Jan; Hristov, Peter Zahariev; Huang, Meidana; Humanic, Thomas; Hutter, Dirk; Hwang, Dae Sung; Ilkaev, Radiy; Ilkiv, Iryna; Inaba, Motoi; Innocenti, Gian Michele; Ionita, Costin; Ippolitov, Mikhail; Irfan, Muhammad; Ivanov, Marian; Ivanov, Vladimir; Ivanytskyi, Oleksii; Jacholkowski, Adam Wlodzimierz; Jacobs, Peter Martin; Jahnke, Cristiane; Jang, Haeng Jin; Janik, Malgorzata Anna; Pahula Hewage, Sandun; Jena, Satyajit; Jimenez Bustamante, Raul Tonatiuh; Jones, Peter Graham; Jung, Hyungtaik; Jusko, Anton; Kalcher, Sebastian; Kalinak, Peter; Kalweit, Alexander Philipp; Kamin, Jason Adrian; Kang, Ju Hwan; Kaplin, Vladimir; Kar, Somnath; Karasu Uysal, Ayben; Karavichev, Oleg; Karavicheva, Tatiana; Karpechev, Evgeny; Kebschull, Udo Wolfgang; Keidel, Ralf; Ketzer, Bernhard Franz; Khan, Mohammed Mohisin; Khan, Palash; Khan, Shuaib Ahmad; Khanzadeev, Alexei; Kharlov, Yury; Kileng, Bjarte; Kim, Beomkyu; Kim, Do Won; Kim, Dong Jo; Kim, Jinsook; Kim, Mimae; Kim, Minwoo; Kim, Se Yong; Kim, Taesoo; Kirsch, Stefan; Kisel, Ivan; Kiselev, Sergey; Kisiel, Adam Ryszard; Kiss, Gabor; Klay, Jennifer Lynn; Klein, Jochen; Klein-Boesing, Christian; Kluge, Alexander; Knichel, Michael Linus; Knospe, Anders Garritt; Kobdaj, Chinorat; Kofarago, Monika; Kohler, Markus Konrad; Kollegger, Thorsten; Kolozhvari, Anatoly; Kondratev, Valerii; Kondratyeva, Natalia; Konevskikh, Artem; Kovalenko, Vladimir; Kowalski, Marek; Kox, Serge; Koyithatta Meethaleveedu, Greeshma; Kral, Jiri; Kralik, Ivan; Kramer, Frederick; Kravcakova, Adela; Krelina, Michal; Kretz, Matthias; Krivda, Marian; Krizek, Filip; Krus, Miroslav; Kryshen, Evgeny; Krzewicki, Mikolaj; Kucera, Vit; Kucheryaev, Yury; Kugathasan, Thanushan; Kuhn, Christian Claude; Kuijer, Paulus Gerardus; Kulakov, Igor; Kumar, Jitendra; Kurashvili, Podist; Kurepin, Alexander; Kurepin, Alexey; Kuryakin, Alexey; Kushpil, Svetlana; Kweon, Min Jung; Kwon, Youngil; Ladron De Guevara, Pedro; Lagana Fernandes, Caio; Lakomov, Igor; Langoy, Rune; Lara Martinez, Camilo Ernesto; Lardeux, Antoine Xavier; Lattuca, Alessandra; La Pointe, Sarah Louise; La Rocca, Paola; Lea, Ramona; Lee, Graham Richard; Legrand, Iosif; Lehnert, Joerg Walter; Lemmon, Roy Crawford; 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Martin, Nicole Alice; Martinengo, Paolo; Martinez Hernandez, Mario Ivan; Martinez-Garcia, Gines; Martin Blanco, Javier; Martynov, Yevgen; Mas, Alexis Jean-Michel; Masciocchi, Silvia; Masera, Massimo; Masoni, Alberto; Massacrier, Laure Marie; Mastroserio, Annalisa; Matyja, Adam Tomasz; Mayer, Christoph; Mazer, Joel Anthony; Mazzoni, Alessandra Maria; Meddi, Franco; Menchaca-Rocha, Arturo Alejandro; Meninno, Elisa; Mercado-Perez, Jorge; Meres, Michal; Miake, Yasuo; Mikhaylov, Konstantin; Milano, Leonardo; Milosevic, Jovan; Mischke, Andre; Mishra, Aditya Nath; Miskowiec, Dariusz Czeslaw; Mitu, Ciprian Mihai; Mlynarz, Jocelyn; Mohanty, Bedangadas; Molnar, Levente; Montano Zetina, Luis Manuel; Montes Prado, Esther; Morando, Maurizio; Moreira De Godoy, Denise Aparecida; Moretto, Sandra; Morreale, Astrid; Morsch, Andreas; Muccifora, Valeria; Mudnic, Eugen; Muhuri, Sanjib; Mukherjee, Maitreyee; Muller, Hans; Gameiro Munhoz, Marcelo; Murray, Sean; Musa, Luciano; Musinsky, Jan; Nandi, Basanta Kumar; Nania, Rosario; Nappi, Eugenio; Nattrass, Christine; Nayak, Tapan Kumar; Nazarenko, Sergey; Nedosekin, Alexander; Nicassio, Maria; Niculescu, Mihai; Nielsen, Borge Svane; Nikolaev, Sergey; Nikulin, Sergey; Nikulin, Vladimir; Nilsen, Bjorn Steven; Noferini, Francesco; Nomokonov, Petr; Nooren, Gerardus; Nyanin, Alexander; Nystrand, Joakim Ingemar; Oeschler, Helmut Oskar; Oh, Saehanseul; Oh, Sun Kun; Okatan, Ali; Olah, Laszlo; Oleniacz, Janusz; Oliveira Da Silva, Antonio Carlos; Onderwaater, Jacobus; Oppedisano, Chiara; Ortiz Velasquez, Antonio; Oskarsson, Anders Nils Erik; Otwinowski, Jacek Tomasz; Oyama, Ken; Sahoo, Pragati; Pachmayer, Yvonne Chiara; Pachr, Milos; Pagano, Paola; Paic, Guy; Painke, Florian; Pajares Vales, Carlos; Pal, Susanta Kumar; Palmeri, Armando; Pant, Divyash; Papikyan, Vardanush; Pappalardo, Giuseppe; Pareek, Pooja; Park, Woojin; Parmar, Sonia; Passfeld, Annika; Patalakha, Dmitry; Paticchio, Vincenzo; Paul, Biswarup; Pawlak, Tomasz Jan; Peitzmann, Thomas; Pereira Da Costa, Hugo Denis Antonio; 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Silvermyr, David Olle Rickard; Silvestre, Catherine Micaela; Simatovic, Goran; Singaraju, Rama Narayana; Singh, Ranbir; Singha, Subhash; Singhal, Vikas; Sinha, Bikash; Sarkar - Sinha, Tinku; Sitar, Branislav; Sitta, Mario; Skaali, Bernhard; Skjerdal, Kyrre; Smakal, Radek; Smirnov, Nikolai; Snellings, Raimond; Soegaard, Carsten; Soltz, Ron Ariel; Song, Jihye; Song, Myunggeun; Soramel, Francesca; Sorensen, Soren Pontoppidan; Spacek, Michal; Sputowska, Iwona Anna; Spyropoulou-Stassinaki, Martha; Srivastava, Brijesh Kumar; Stachel, Johanna; Stan, Ionel; Stefanek, Grzegorz; Steinpreis, Matthew Donald; Stenlund, Evert Anders; Steyn, Gideon Francois; Stiller, Johannes Hendrik; Stocco, Diego; Stolpovskiy, Mikhail; Strmen, Peter; Alarcon Do Passo Suaide, Alexandre; Subieta Vasquez, Martin Alfonso; Sugitate, Toru; Suire, Christophe Pierre; Suleymanov, Mais Kazim Oglu; Sultanov, Rishat; Sumbera, Michal; Susa, Tatjana; Symons, Timothy; Szanto De Toledo, Alejandro; Szarka, Imrich; Szczepankiewicz, Adam; Szymanski, Maciej Pawel; Takahashi, Jun; Tangaro, Marco-Antonio; Tapia Takaki, Daniel Jesus; Tarantola Peloni, Attilio; Tarazona Martinez, Alfonso; Tarzila, Madalina-Gabriela; Tauro, Arturo; Tejeda Munoz, Guillermo; Telesca, Adriana; Terrevoli, Cristina; Ter-Minasyan, Astkhik; Thaeder, Jochen Mathias; Thomas, Deepa; Tieulent, Raphael Noel; Timmins, Anthony Robert; Toia, Alberica; Torii, Hisayuki; Trubnikov, Victor; Trzaska, Wladyslaw Henryk; Tsuji, Tomoya; Tumkin, Alexandr; Turrisi, Rosario; Tveter, Trine Spedstad; Ulery, Jason Glyndwr; Ullaland, Kjetil; Uras, Antonio; Usai, Gianluca; Vajzer, Michal; Vala, Martin; Valencia Palomo, Lizardo; Vallero, Sara; Vande Vyvre, Pierre; Vannucci, Luigi; Van Der Maarel, Jasper; Van Hoorne, Jacobus Willem; Van Leeuwen, Marco; Vargas Trevino, Aurora Diozcora; Varma, Raghava; Vasileiou, Maria; Vasiliev, Andrey; Vechernin, Vladimir; Veldhoen, Misha; Velure, Arild; Venaruzzo, Massimo; Vercellin, Ermanno; Vergara Limon, Sergio; Vernet, Renaud; Verweij, Marta; Vickovic, Linda; Viesti, Giuseppe; Viinikainen, Jussi Samuli; Vilakazi, Zabulon; Villalobos Baillie, Orlando; Vinogradov, Alexander; Vinogradov, Leonid; Vinogradov, Yury; Virgili, Tiziano; Vislavicius, Vytautas; Viyogi, Yogendra; Vodopyanov, Alexander; Volkl, Martin Andreas; Voloshin, Kirill; Voloshin, Sergey; Volpe, Giacomo; Von Haller, Barthelemy; Vorobyev, Ivan; Vranic, Danilo; Vrlakova, Janka; Vulpescu, Bogdan; Vyushin, Alexey; Wagner, Boris; Wagner, Jan; Wagner, Vladimir; Wang, Mengliang; Wang, Yifei; Watanabe, Daisuke; Weber, Michael; Weber, Steffen Georg; Wessels, Johannes Peter; Westerhoff, Uwe; Wiechula, Jens; Wikne, Jon; Wilde, Martin Rudolf; Wilk, Grzegorz Andrzej; Wilkinson, Jeremy John; Williams, Crispin; Windelband, Bernd Stefan; Winn, Michael Andreas; Xiang, Changzhou; Yaldo, Chris G; Yamaguchi, Yorito; Yang, Hongyan; Yang, Ping; Yang, Shiming; Yano, Satoshi; Yasnopolskiy, Stanislav; Yi, Jungyu; Yin, Zhongbao; Yoo, In-Kwon; Yushmanov, Igor; Zaccolo, Valentina; Zach, Cenek; Zaman, Ali; Zampolli, Chiara; Zaporozhets, Sergey; Zarochentsev, Andrey; Zavada, Petr; Zavyalov, Nikolay; Zbroszczyk, Hanna Paulina; Zgura, Sorin Ion; Zhalov, Mikhail; Zhang, Haitao; Zhang, Xiaoming; Zhang, Yonghong; Zhao, Chengxin; Zhigareva, Natalia; Zhou, Daicui; Zhou, Fengchu; Zhou, You; Zhu, Hongsheng; Zhu, Jianhui; Zhu, Xiangrong; Zichichi, Antonino; Zimmermann, Alice; Zimmermann, Markus Bernhard; Zinovjev, Gennady; Zoccarato, Yannick Denis; Zynovyev, Mykhaylo; Zyzak, Maksym

    2014-01-01

    ALICE is the heavy-ion experiment at the CERN Large Hadron Collider. The experiment continuously took data during the first physics campaign of the machine from fall 2009 until early 2013, using proton and lead-ion beams. In this paper we describe the running environment and the data handling procedures, and discuss the performance of the ALICE detectors and analysis methods for various physics observables.

  16. VHMPID: a new detector for the ALICE experiment at LHC

    Directory of Open Access Journals (Sweden)

    Perini D.

    2011-04-01

    Full Text Available This article presents the basic idea of VHMPID, an upgrade detector for the ALICE experiment at LHC, CERN. The main goal of this detector is to extend the particle identification capabilities of ALICE to give more insight into the evolution of the hot and dense matter created in Pb-Pb collisions. Starting from the physics motivations and working principles the challenges and current status of development is detailed.

  17. Interfacing HepMC with Alice Analysis Framework

    CERN Document Server

    Thorsbro, Brian Peter

    2014-01-01

    An interface is implemented, which injects data in a specific format called HepMC from Monte Carlo event generators into the simulation and reconstruction environment of the ALICE experiment, called ``AliRoot''. The interface can both be used in a stand alone version to analyse output from Monte Carlo event generators, or it can be used on the grid to run large scale productions in the ALICE simulation and reconstrunction environment.

  18. VHMPID: a new detector for the ALICE experiment at LHC

    CERN Document Server

    Agócs, A Gu; Barnaföldi, G G; Bellwied, R; Bencze, Gy; Berényi, D; Boldizsár, L; Cuautle, E; De Cataldo, G; Di Bari, D; Di Mauro, A; Dominguez, I; Futó, E; García, E; Hamar, G; Harris, J; Harton, A; Kovács, L; Lévai, P; Lipusz, Cs; Markert, C; Martinengo, P; Martinez, M I; Mastromarco, M; Mayani, D; Molnár, L; Nappi, E; Ortiz, A; Paić, G; Pastore, C; Patino, M E; Perini, D; Perrino, D; Peskov, V; Pinsky, L; Piuz, F; Pochybová, S; Smirnov, N; Song, J; Timmins, A; Varga, D; Vargas, A; Vergara, S; Volpe, G; Yi, J; Yoo, I K

    2011-01-01

    This article presents the basic idea of VHMPID, an upgrade detector for the ALICE experiment at LHC, CERN. The main goal of this detector is to extend the particle identification capabilities of ALICE to give more insight into the evolution of the hot and dense matter created in Pb-Pb collisions. Starting from the physics motivations and working principles the challenges and current status of development is detailed.

  19. Noise Filtering and Signal Calibration in the MicroBooNE LArTPC

    Science.gov (United States)

    Joshi, Jyoti; Qian, Xin; MicroBooNE Collaboration Collaboration

    2017-01-01

    In large liquid argon time projection chambers (LArTPCs), TPC signal processing, which recovers the number of ionized electrons arriving at anode wire planes from the raw digitized induction signals, is a crucial step towards automated event reconstruction. The first stage of signal processing is the identification and removal of any excess TPC noise with minimal impact on the true signal. In this talk, first I will describe the characterization and software filtering techniques of various TPC noise observed in the raw digital signal data in MicroBooNE. I will then describe a novel drifted-charge extraction method based on 2D deconvolution technique. These techniques significantly enhance the performance of the induction wire planes in MicroBooNE.

  20. TPC track distortions: correction maps for magnetic and static electric inhomogeneities

    CERN Document Server

    Dydak, F; Nefedov, Y

    2003-01-01

    Inhomogeneities of the magnetic and electric fields in the active TPC volume lead to displacements of cluster coordinates, and therefore to track distortions. In case of good data taking conditions, the largest effects are expected from the inhomogeneity of the solenoidal magnetic field, and from a distortion of the electric field arising from a high voltage misalignment between the outer and inner field cages. Both effects are stable over the entire HARP data taking. The displacements are large compared to the azimuthal coordinate resolution but can be corrected with sufficient precision, except at small TPC radius. The high voltage misalignment between the outer and inner field cages is identified as the likely primary cause of sagitta distortions of TPC tracks. The position and the length of the target plays an important role. Based on a detailed modelling of the magnetic and static electric field inhomogeneities, precise correction maps for both effects have been calculated. Predictions from the correctio...

  1. The NEXT experiment: A high pressure xenon gas TPC for neutrinoless double beta decay searches

    CERN Document Server

    Lorca, D; Monrabal, F

    2012-01-01

    Neutrinoless double beta decay is a hypothetical, very slow nuclear transition in which two neutrons undergo beta decay simultaneously and without the emission of neutrinos. The importance of this process goes beyond its intrinsic interest: an unambiguous observation would establish a Majorana nature for the neutrino and prove the violation of lepton number. NEXT is a new experiment to search for neutrinoless double beta decay using a radiopure high-pressure xenon gas TPC, filled with 100 kg of Xe enriched in Xe-136. NEXT will be the first large high-pressure gas TPC to use electroluminescence readout with SOFT (Separated, Optimized FuncTions) technology. The design consists in asymmetric TPC, with photomultipliers behind a transparent cathode and position-sensitive light pixels behind the anode. The experiment is approved to start data taking at the Laboratorio Subterr\\'aneo de Canfranc (LSC), Spain, in 2014.

  2. TPC-BASED STBC MULTIUSER DETECTION WITH LSE-RLS ALGORITHM

    Institute of Scientific and Technical Information of China (English)

    Du Yinggang; Chan Kam Tai

    2006-01-01

    The Bit Error Rate (BER) performance of a Turbo Product Code (TPC) based Space-Time Block Coding (STBC) multiuser wireless system in the frequency-selective channels has been investigated. Both of the good error correcting capability of TPC and the large diversity gain of STBC can be achieved simultaneously. A Least Square Error-Recursive Least Square (LSE-RLS) algorithm is applied to estimate the channel and cancel the interference. Simulations show that the proposed system can obtain about 2.7dB gain in Es/No at the BER of 10-3.

  3. Design of a Radial TPC for Antihydrogen Gravity Measurement with ALPHA-g

    CERN Document Server

    Capra, Andrea; Bishop, Daryl; Fujiwara, Makoto C; Freeman, Skyler; Gill, David; Grant, Matthew; Henderson, Robert; Kurchaninov, Leonid; Lu, Philip; Menary, Scott; Olchanski, Konstantin; Retiere, Fabrice

    2016-01-01

    The gravitational interaction of antimatter and matter has never been directly probed. ALPHA-g is a novel experiment that aims to perform the first measurement of the antihydrogen gravitational mass. A fundamental requirement for this new apparatus is a position sensitive particle detector around the antihydrogen trap which provides information about antihydrogen annihilation location. The proposed detector is a radial Time Projection Chamber, or \\textit{rTPC}, whose concept is being developed at TRIUMF. A simulation of the detector and the development of the reconstruction software, used to determine the antihydrogen annihilation point, is presented alongside with the expected performance of the rTPC.

  4. Integration of XRootD into the cloud infrastructure for ALICE data analysis

    Science.gov (United States)

    Kompaniets, Mikhail; Shadura, Oksana; Svirin, Pavlo; Yurchenko, Volodymyr; Zarochentsev, Andrey

    2015-12-01

    Cloud technologies allow easy load balancing between different tasks and projects. From the viewpoint of the data analysis in the ALICE experiment, cloud allows to deploy software using Cern Virtual Machine (CernVM) and CernVM File System (CVMFS), to run different (including outdated) versions of software for long term data preservation and to dynamically allocate resources for different computing activities, e.g. grid site, ALICE Analysis Facility (AAF) and possible usage for local projects or other LHC experiments. We present a cloud solution for Tier-3 sites based on OpenStack and Ceph distributed storage with an integrated XRootD based storage element (SE). One of the key features of the solution is based on idea that Ceph has been used as a backend for Cinder Block Storage service for OpenStack, and in the same time as a storage backend for XRootD, with redundancy and availability of data preserved by Ceph settings. For faster and easier OpenStack deployment was applied the Packstack solution, which is based on the Puppet configuration management system. Ceph installation and configuration operations are structured and converted to Puppet manifests describing node configurations and integrated into Packstack. This solution can be easily deployed, maintained and used even in small groups with limited computing resources and small organizations, which usually have lack of IT support. The proposed infrastructure has been tested on two different clouds (SPbSU & BITP) and integrates successfully with the ALICE data analysis model.

  5. The Alice Project at the IPN, Orsay R and D and software developments 1996-2003

    Energy Technology Data Exchange (ETDEWEB)

    MacCormick, M

    2007-03-15

    This document reviews the theoretical, experimental and technical achievements of the author since the beginning of his scientific career. In 1996 the author became a member of the Alice (A Large heavy Ion Collider Experiment) which was then at the beginning of its research and development phase. The bulk of this report comprises mainly 'snapshots' of the research and development project that was pursued in Orsay for the Alice dimuon arm collaboration. The idea here is to regroup the full set of prototype models, with the technical specifications and their associated test programs. The main results are given for each set of tests, but the details of how data sets were analysed are not included since those details are already available in other, more formal, write-ups. The result is a kind of 'scrapbook' of the research and development phase associated with the Alice dimuon arm station 1 tracker, one of the 5 tracker stations implemented in the dimuon arm spectrometer. This document presented before an academic board will allow its author to manage research works and particularly to tutor thesis students.

  6. TPC1 Has Two Variant Isoforms, and Their Removal Has Different Effects on Endo-Lysosomal Functions Compared to Loss of TPC2

    OpenAIRE

    Ruas, Margarida; Chuang, Kai-Ting; Davis, Lianne C.; Al-Douri, Areej; Tynan, Patricia W.; Tunn, Ruth; Teboul, Lydia; Galione, Antony; Parrington, John

    2014-01-01

    Organelle ion homeostasis within the endo-lysosomal system is critical for physiological functions. Two-pore channels (TPCs) are cation channels that reside in endo-lysosomal organelles, and overexpression results in endo-lysosomal trafficking defects. However, the impact of a lack of TPC expression on endo-lysosomal trafficking is unknown. Here, we characterize Tpcn1 expression in two transgenic mouse lines (Tpcn1 XG716 and Tpcn1 T159) and show expression of a novel evolutionarily conserved ...

  7. An optical readout TPC (O-TPC) for studies in nuclear astrophysics with gamma-ray beams at HI{gamma}S{sup 1}

    Energy Technology Data Exchange (ETDEWEB)

    Gai, M; Zimmerman, W R; Kading, T J; Seo, P-N; Young, A H [LNS at Avery Point, University of Connecticut, Groton, CT 06340-6097 (United States); Ahmed, M W; Stave, S C; Henshaw, S S; Martel, P P; Weller, H R [TUNL, Dept. of Physics, Duke University, Durham, NC 27708 (United States); Breskin, A; Chechik, R [Dept. of Particle Physics, Weizmann Institute of Science, 76100 Rehovot (Israel); Bromberger, B; Dangendorf, V; Tittelmeier, K [Physikalisch-Technische Bundesanstalt, 38116 Braunschweig (Germany); Delbar, Th [Universite Catholique de Louvain, 1348 Louvain-la-Neuve (Belgium); III, R H France [Georgia College and State University, CBX 82, Milledgeville, GA 31061 (United States); McDonald, J E R, E-mail: moshe.gai@yale.edu [Dept. of Physics, Yale University, New Haven, CT 06520-8124 (United States)

    2010-12-15

    We report on the construction, tests, calibrations and commissioning of an Optical Readout Time Projection Chamber (O-TPC) detector operating with a CO{sub 2}(80%) + N{sub 2}(20%) gas mixture at 100 and 150 Torr. It was designed to measure the cross sections of several key nuclear reactions involved in stellar evolution. In particular, a study of the rate of formation of oxygen and carbon during the process of helium burning will be performed by exposing the chamber gas to intense nearly mono-energetic gamma-ray beams at the High Intensity Gamma Source (HI{gamma}S) facility. The O-TPC has a sensitive target-drift volume of 30x30x21 cm{sup 3}. Ionization electrons drift towards a double parallel-grid avalanche multiplier, yielding charge multiplication and light emission. Avalanche-induced photons from N{sub 2} emission are collected, intensified and recorded with a Charge Coupled Device (CCD) camera, providing two-dimensional track images. The event's time projection (third coordinate) and the deposited energy are recorded by photomultipliers and by the TPC charge-signal, respectively. A dedicated VME-based data acquisition system and associated data analysis tools were developed to record and analyze these data. The O-TPC has been tested and calibrated with 3.183 MeV alpha-particles emitted by a {sup 148}Gd source placed within its volume with a measured energy resolution of 3.0%. Tracks of alpha and {sup 12}C particles from the dissociation of {sup 16}O and of three alpha-particles from the dissociation of {sup 12}C have been measured during initial in-beam test experiments performed at the HI{gamma}S facility at Duke University. The full detection system and its performance are described and the results of the preliminary in-beam test experiments are reported.

  8. TPC1 has two variant isoforms, and their removal has different effects on endo-lysosomal functions compared to loss of TPC2.

    Science.gov (United States)

    Ruas, Margarida; Chuang, Kai-Ting; Davis, Lianne C; Al-Douri, Areej; Tynan, Patricia W; Tunn, Ruth; Teboul, Lydia; Galione, Antony; Parrington, John

    2014-11-01

    Organelle ion homeostasis within the endo-lysosomal system is critical for physiological functions. Two-pore channels (TPCs) are cation channels that reside in endo-lysosomal organelles, and overexpression results in endo-lysosomal trafficking defects. However, the impact of a lack of TPC expression on endo-lysosomal trafficking is unknown. Here, we characterize Tpcn1 expression in two transgenic mouse lines (Tpcn1(XG716) and Tpcn1(T159)) and show expression of a novel evolutionarily conserved Tpcn1B transcript from an alternative promoter, raising important questions regarding the status of Tpcn1 expression in mice recently described to be Tpcn1 knockouts. We show that the transgenic Tpcn1(T159) line lacks expression of both Tpcn1 isoforms in all tissues analyzed. Using mouse embryonic fibroblasts (MEFs) from Tpcn1(-/-) and Tpcn2(-/-) animals, we show that a lack of Tpcn1 or Tpcn2 expression has no significant impact on resting endo-lysosomal pH or morphology. However, differential effects in endo-lysosomal function were observed upon the loss of Tpcn1 or Tpcn2 expression; thus, while Tpcn1(-/-) MEFs have impaired trafficking of cholera toxin from the plasma membrane to the Golgi apparatus, Tpcn2(-/-) MEFs show slower kinetics of ligand-induced platelet-derived growth factor receptor β (PDGFRβ) degradation, which is dependent on trafficking to lysosomes. Our findings indicate that TPC1 and TPC2 have important but distinct roles in the endo-lysosomal pathway.

  9. Light flavor results in p-Pb collisions with ALICE

    CERN Document Server

    Ortiz, Antonio

    2016-01-01

    Particle ratios provide insight into the hadrochemistry of the event and the mechanisms for particle production. In Pb-Pb collisions the relative multi-strange baryon yields exhibit an enhancement with respect to pp collisions, whereas the short-lived K$^{*0}$ resonance is suppressed in the most central events due to re-scattering of its decay daughter particles. Measurements in p-Pb allow us to investigate the development of these effects as a function of the system size. We report comprehensive results on light-flavor hadron production measured with the ALICE detector in p-Pb collisions at $\\sqrt{s_{\\rm NN}}=5.02$ TeV, covering a wide range of particle species which includes long-lived hadrons, resonances and multi-strange baryons. The measurements include the transverse momentum spectra and the ratios of spectra among different species, and extend over a very large transverse momentum region, from $\\approx$100 MeV/$c$ to $\\approx$20 GeV/$c$, depending on the particle species.

  10. Lessons from the operation of the `Penning-Fluorescent' TPC and prospects

    CERN Document Server

    Gonzalez-Diaz, Diego; Castel, J; Cebrian, S; Dafni, T; Garcia, J A; Gomez, H; Herrera, D C; Iguaz, F J; Irastorza, I G; Lagraba, A; Luzon, G; Rodriguez, A; Ruiz-Choliz, E; Ferrer-Ribas, A Tomas E; Giomataris, I

    2015-01-01

    We have recently reported the development of a new type of high-pressure Xenon time projection chamber operated with an ultra-low diffusion mixture and that simultaneously displays Penning effect and fluorescence in the near-visible region (300 nm). The concept, dubbed `Penning-Fluorescent' TPC, allows the simultaneous reconstruction of primary charge and scintillation with high topological and calorimetric fidelity.

  11. Measuring Cross-Section and Estimating Uncertainties with the fissionTPC

    Energy Technology Data Exchange (ETDEWEB)

    Bowden, N. [Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Manning, B. [Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Sangiorgio, S. [Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Seilhan, B. [Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

    2015-01-30

    The purpose of this document is to outline the prescription for measuring fission cross-sections with the NIFFTE fissionTPC and estimating the associated uncertainties. As such it will serve as a work planning guide for NIFFTE collaboration members and facilitate clear communication of the procedures used to the broader community.

  12. Study of electron recombination in liquid argon with the ICARUS TPC

    Energy Technology Data Exchange (ETDEWEB)

    Amoruso, S.; Antonello, M.; Aprili, P.; Arneodo, F.; Badertscher, A.; Baiboussinov, B.; Baldo Ceolin, M.; Battistoni, G.; Bekman, B.; Benetti, P.; Bischofberger, M.; Borio di Tigliole, A.; Brunetti, R.; Bruzzese, R.; Bueno, A.; Buzzanca, M.; Calligarich, E.; Campanelli, M.; Carbonara, F.; Carpanese, C.; Cavalli, D.; Cavanna, F.; Cennini, P.; Centro, S.; Cesana, A.; Chen, C.; Chen, D.; Chen, D.B.; Chen, Y.; Cieslik, K.; Cline, D.; Cocco, A.G.; Dai, Z.; De Vecchi, C.; Dabrowska, A.; Di Cicco, A.; Dolfini, R.; Ereditato, A.; Felcini, M.; Ferrari, A.; Ferri, F.; Fiorillo, G.; Galli, S.; Ge, Y.; Gibin, D.; Gigli Berzolari, A.; Gil-Botella, I.; Graczyk, K.; Grandi, L.; Guglielmi, A.; He, K.; Holeczek, J.; Huang, X.; Juszczak, C.; Kielczewska, D.; Kisiel, J.; Kozlowski, T.; Laffranchi, M.; Lagoda, J.; Li, Z.; Lu, F.; Ma, J.; Mangano, G.; Markiewicz, M.; Martinez de la Ossa, A.; Matthey, C.; Mauri, F.; Meng, G.; Messina, M.; Montanari, C.; Muraro, S.; Navas-Concha, S.; Otwinowski, S.; Ouyang, Q.; Palamara, O.; Pascoli, D.; Periale, L.; Piano Mortari, G.B.; Piazzoli, A.; Picchi, P.; Pietropaolo, F.; Polopek, W.; Rancati, T.; Rappoldi, A.; Raselli, G.L.; Rico, J.; Rondio, E.; Rossella, M.; Rubbia, A.; Rubbia, C.; Sala, P.R. E-mail: paola.sala@cern.ch; Santorelli, R.; Scannicchio, D.; Segreto, E.; Seo, Y.; Sergiampietri, F.; Sobczyk, J.; Spinelli, N.; Stepaniak, J.; Sulej, R.; Szarska, M.; Szeptycka, M.; Terrani, M.; Velotta, R.; Ventura, S.; Vignoli, C.; Wang, H.; Wang, X.; Woo, J.; Xu, G.; Xu, Z.; Zalewska, A.; Zhang, C.; Zhang, Q.; Zhen, S.; Zipper, W

    2004-05-11

    Electron recombination in liquid argon (LAr) is studied by means of charged particle tracks collected in various ICARUS liquid argon TPC prototypes. The dependence of the recombination on the particle stopping power has been fitted with a Birks functional dependence. The simulation of the process of electron recombination in Monte Carlo calculations is discussed. A quantitative comparison with previously published data is carried out.

  13. Alice-Anne Martin (1926 - 2016)

    CERN Multimedia

    2016-01-01

    Alice-Anne Martin, known as “Schu” from her maiden name Schubert, passed away on 8 January 2016.   (Image: Gérard Bertin) Hired the year CERN was founded, 1954, when the construction of the Laboratory had not even begun, Schu first worked at the Villa de Cointrin (a historic building now within the grounds of Geneva airport) as a secretary. In this role, she typed the convention between CERN and the Swiss Confederation, prepared by Stéphanie Tixier, as well as some of the "Yellow Reports" that have marked key points in the Laboratory’s history. For example, using a special typewriter with two keyboards – Latin and Greek – she typed the Yellow Report on the KAM theorem by Rolf Hagedorn. Schu also worked with Felix Bloch, the first Director-General of CERN, and later became the secretary of Herbert Coblenz, the first CERN librarian. She was head of the team that edited the proceedings of the ...

  14. ALICE HLT high speed tracking on GPU

    CERN Document Server

    Gorbunov, Sergey; Aamodt, Kenneth; Alt, Torsten; Appelshauser, Harald; Arend, Andreas; Bach, Matthias; Becker, Bruce; Bottger, Stefan; Breitner, Timo; Busching, Henner; Chattopadhyay, Sukalyan; Cleymans, Jean; Cicalo, Corrado; Das, Indranil; Djuvsland, Oystein; Engel, Heiko; Erdal, Hege Austrheim; Fearick, Roger; Haaland, Oystein Senneset; Hille, Per Thomas; Kalcher, Sebastian; Kanaki, Kalliopi; Kebschull, Udo Wolfgang; Kisel, Ivan; Kretz, Matthias; Lara, Camillo; Lindal, Sven; Lindenstruth, Volker; Masoodi, Arshad Ahmad; Ovrebekk, Gaute; Panse, Ralf; Peschek, Jorg; Ploskon, Mateusz; Pocheptsov, Timur; Ram, Dinesh; Rascanu, Theodor; Richter, Matthias; Rohrich, Dieter; Ronchetti, Federico; Skaali, Bernhard; Smorholm, Olav; Stokkevag, Camilla; Steinbeck, Timm Morten; Szostak, Artur; Thader, Jochen; Tveter, Trine; Ullaland, Kjetil; Vilakazi, Zeblon; Weis, Robert; Yin, Zhong-Bao; Zelnicek, Pierre

    2011-01-01

    The on-line event reconstruction in ALICE is performed by the High Level Trigger, which should process up to 2000 events per second in proton-proton collisions and up to 300 central events per second in heavy-ion collisions, corresponding to an inp ut data stream of 30 GB/s. In order to fulfill the time requirements, a fast on-line tracker has been developed. The algorithm combines a Cellular Automaton method being used for a fast pattern recognition and the Kalman Filter method for fitting of found trajectories and for the final track selection. The tracker was adapted to run on Graphics Processing Units (GPU) using the NVIDIA Compute Unified Device Architecture (CUDA) framework. The implementation of the algorithm had to be adjusted at many points to allow for an efficient usage of the graphics cards. In particular, achieving a good overall workload for many processor cores, efficient transfer to and from the GPU, as well as optimized utilization of the different memories the GPU offers turned out to be cri...

  15. Detector performance of the ALICE silicon pixel detector

    CERN Document Server

    Cavicchioli, C

    2011-01-01

    The ALICE Silicon Pixel Detector (SPD) forms the two innermost layers of the ALICE Inner Tracking System (ITS). It consists of two barrel layers of hybrid silicon pixel detectors at radii of 39 and 76 mm. The physics targets of the ALICE experiment require that the material budget of the SPD is kept within approximate to 1\\%X(0) per layer. This has set some stringent constraints on the design and construction of the SPD. A unique feature of the ALICE SPD is that it is capable of providing a prompt trigger signal, called Fast-OR, which contributes to the L0 trigger decision. The pixel trigger system allows to apply a set of algorithms for the trigger selection, and its output is sent to the Central Trigger Processor (CTP). The detector has been installed in the experiment in summer 2007. During the first injection tests in June 2008 the SPD was able to record the very first sign of life of the LHC by registering secondary particles from the beam dumped upstream the ALICE experiment. In the following months the...

  16. Federico Antinori elected as the new ALICE Spokesperson

    CERN Multimedia

    Iva Raynova

    2016-01-01

    On 8 April 2016 the ALICE Collaboration Board elected Federico Antinori from INFN Padova (Italy) as the new ALICE Spokesperson.   During his three-year mandate, starting in January 2017, he will lead a collaboration of more than 1500 people from 154 physics institutes across the globe. Antinori has been a member of the collaboration ever since it was created and he has already held many senior leadership positions. Currently he is the experiment’s Physics Coordinator and as such he has the responsibility to overview the whole sector of physics analysis. During his mandate ALICE has produced many of its most prominent results. Before that he was the Coordinator of the Heavy Ion First Physics Task Force, charged with the analysis of the first Pb-Pb data samples. In 2007 and 2008 Federico served as ALICE Deputy Spokesperson. He was also the first ALICE Trigger Coordinator, having a central role in defining the experiment’s trigger menus from the first run in 2009 until the end of...

  17. No more escape for particle jets in ALICE

    CERN Multimedia

    Antonella Del Rosso

    2013-01-01

    Particle jets are key tools for physicists to probe the quark-gluon plasma, a state of matter that existed a few moments after the Big Bang and that is reproduced in heavy-ion collisions at the LHC. The ALICE experiment is being upgraded to include a new calorimeter arm designed to extend significantly its capabilities to detect and measure jets of particles.   DCal and PHOS new support beams and support cradle are assembled and ready for installation. The new calorimeter, called the “DCal”, is a large lead-scintillator detector with photo-diode readout placed in the opposite azimuth to the existing electromagnetic calorimeter (EMCal). This is the optimal configuration for the measurements of back-to-back jets, which originate in the interactions of ultra-high-energy quarks and gluons. The Dcal has been built by the same international team from institutes in France, Italy and the US that built the EMCal, with additional new contributions from institutes in Japan and Chin...

  18. Charged particle production under EMCal trigger condition with ALICE

    Energy Technology Data Exchange (ETDEWEB)

    Huhn, Patrick [Institut fuer Kernphysik, Goethe-Universitaet Frankfurt (Germany)

    2015-07-01

    The ALICE experiment at the LHC is designed to study the properties of the Quark-Gluon-Plasma (QGP). The measured transverse momentum (p{sub T}) distribution in heavy ion collisions can be compared to that measured in pp collisions in terms of the nuclear modification factor (R{sub AA}). The minimum bias pp reference at √(s) = 2.76 TeV and therefore R{sub AA} in Pb-Pb collisions are currently limited in their p{sub T} range to p{sub T} = 50 GeV/c. To extend the p{sub T} distribution to higher p{sub T} (p{sub T} > 50 GeV/c), triggers can be used. We present an analysis of the cross section of inclusive charged particles in pp collisions as a function of p{sub T} with a selection on deposited energy in the electromagnetic calorimeter (EMCal). Results based on a Toy Monte Carlo simulation including realistic EMCal geometry and acceptance to evaluate trigger biases are presented.

  19. 10'000 ton ALICE gets her UK-built "Brain"

    CERN Multimedia

    Maddock, Julia

    2007-01-01

    For one of the four LEP experiments, called ALICE, the process got a step closer last week when a crucial part of the 10'000-ton detector, the British-built Central Trigger Processor (CTP), was installed in the ALICE cavern, some 150 feet underground. (plus background information about ALICE) (2,5 pages)

  20. Disability Exclusion and Rights: The Life Story of Alice Jamieson

    Directory of Open Access Journals (Sweden)

    Allison Lynch

    2014-06-01

    Full Text Available There is a commonly held belief that fear of disability by society is the reason for segregation of the disabled. Although acknowledging the validity of such a belief, this paper disputes this claim as it pertains to sufferers of mental illness. Specifically it explores one woman’s development of dissociative identity disorder as a result of years of incestuous abuse. Alice Jamieson developed multiple personalities in order to survive her horrendous childhood, which ultimately caused her to live a life of segregation and social exclusion. Alice did however; experience the enabling effects of positive, supportive relationships on rare occasions throughout her childhood (with her grandfather and her adult life (with a work colleague. The telling of her story bought Alice a powerful sense of healing and has helped raise awareness of childhood sexual abuse and its devastating consequences.

  1. Quarkonium production in p–Pb collisions with ALICE

    CERN Document Server

    Lakomov, Igor

    2016-01-01

    The production of quarkonia, bound states of quark and anti-quark pairs, is intensively studied both experimentally and theoretically. They are ideal probes of the Quark-Gluon Plasma (QGP) formed in heavy-ion collisions. At the beginning of 2013, data from p–Pb collisions at sNN=5.02 TeV have been collected by ALICE, which can be exploited to measure cold nuclear matter (CNM) effects on quarkonium production. These measurements are important in order to disentangle, in Pb–Pb collisions, hot and CNM effects. In this paper final ALICE results on the charmonium and bottomonium production in p–Pb collisions from Run I of the LHC are presented. ALICE measurements are compared to various models of CNM effects and to PHENIX measurements.

  2. Operational Experience and Performance of the Present ALICE ITS

    CERN Document Server

    Senyukov, Serhiy

    2015-01-01

    ALICE (A Large Ion Collider Experiment) is one of four major experiments at the CERN LHC. ALICE studies strongly interacting matter under extreme conditions created in heavy ion colli- sions. The Inner Tracking System (ITS) is an essential part of the ALICE detector. It is used for tracking, reconstruction of primary and secondary vertices and particle identification. ITS is composed of six cylindrical layers of silicon detectors. Three different techologies are used: hybrid pixel, drift and strip detectors. The ITS was fully commisioned in 2009 at the start of LHC Run 1. The detectors showed good performance during this period contributing to several important measurements. During the LHC Long Shutdown 1 (LS1) the ITS underwent general consolidation and is now ready for the next LHC run

  3. AliEn: ALICE environment on the GRID

    Energy Technology Data Exchange (ETDEWEB)

    Bagnasco, S; Betev, L; Buncic, P; Carminati, F; Cirstoiu, C; Grigoras, C; Hayrapetyan, A; Harutyunyan, A; Peters, A J; Saiz, P [CERN, European Organization for Nuclear Research, 1211 Geneve 23 (Switzerland)], E-mail: pablo.saiz@cern.ch

    2008-07-15

    Starting from mid-2008, the ALICE detector at CERN LHC will collect data at a rate of 4PB per year. ALICE will use exclusively distributed Grid resources to store, process and analyse this data. The top-level management of the Grid resources is done through the AliEn (ALICE Environment) system, which is in continuous development since year 2000. AliEn presents several original solutions, which have shown their viability in a number of large exercises of increasing complexity called Data Challenges. This paper describes the AliEn architecture: Job Management, Data Management and UI. The current status of AliEn will be illustrated, as well as the performance of the system during the data challenges. The paper also describes the future AliEn development roadmap.

  4. ALICE Connex : Mobile Volunteer Computing and Edutainment Platform

    CERN Document Server

    Chalumporn, Gantaphon

    2016-01-01

    Mobile devices are very powerful and trend to be developed. They have functions that are used in everyday life. One of their main tasks is to be an entertainment devices or gaming platform. A lot of technologies are now accepted and adopted to improve the potential of education. Edutainment is a combination of entertainment and education media together to make use of both benefits. In this work, we introduce a design of edutainment platform which is a part of mobile volunteer computing and edutainment platform called ‘ALICE Connex’ for ALICE at CERN. The edutainment platform focuses to deliver enjoyment and education, while promotes ALICE and Volunteer Computing platform to general public. The design in this work describes the functionality to build an effective edutainment with real-time multiplayer interaction on round-based gameplay, while integrates seamless edutainment with basic particle physic content though game mechanism and items design. For the assessment method we will observe the enjoyment o...

  5. Test Results of the ALICE SDD Electronic Readout Prototypes

    CERN Document Server

    Mazza, G; Anelli, G; Bonazzola, G C; Cavagnino, D; Cerello, P G; De Remigis, P; Falchieri, D; Gabrielli, A; Gandolfi, E; Giubellino, P; Masetti, M; Montaño-Zetina, L M; Nouais, D; Rivetti, A; Tosello, F; Werbrouck, A E; Wheadon, R

    2000-01-01

    The first prototypes of the front-end electronics of the ALICE silicon driftdetectors have been designed and tested. The integrated circuits have been designed using state of the art technologies and, for the analog parts, with radiation-tolerantdesign techniques. In this paper, the test results of the building blocks of the PASCAL chip and the first prototype of the AMBRA chip are presented. The prototypes fully respect the ALICE requirements; owingto the use of deep-submicron technologies together with radiation-tolerant layout techniques, the prototypes have shown a toleranceto a radiation dose much higher than the one foreseen for the ALICE environment.(Abstract only available, full text to follow).

  6. Upgrade of the ALICE Experiment: Letter of Intent

    CERN Document Server

    Abelev, B; Adamová, D; Aggarwal, M M; Aglieri Rinella, G; Agnello, M; Agostinelli, A; Agrawal, N; Ahammed, Z; Ahmad, N; Ahmad Masoodi, A; Ahmed, I; Ahn, S U; Ahn, S A; Aimo, I; Aiola, S; Ajaz, M; Akindinov, A; Aleksandrov, D; Alessandro, B; Alexandre, D; Alici, A; Alkin, A; Alme, J; Alt, T; Altini, V; Altinpinar, S; Altsybeev, I; Alves Garcia Prado, C; Anderssen, E C; Andrei, C; Andronic, A; Anguelov, V; Anielski, J; Anticic, T; Antinori, F; Antonioli, P; Aphecetche, L; Appelshäuser, H; Arbor, N; Arcelli, S; Armesto, N; Arnaldi, R; Aronsson, T; Arsene, I C; Arslandok, M; Augustinus, A; Averbeck, R; Awes, T C; Azmi, M D; Bach, M; Badalà, A; Baek, Y W; Bagnasco, S; Bailhache, R; Bairathi, V; Bala, R; Baldisseri, A; Baltasar Dos Santos Pedrosa, F; Bán, J; Baral, R C; Barbera, R; Barile, F; Barnaföldi, G G; Barnby, L S; Barret, V; Bartke, J; Basile, M; Bastian Van Beelen, J; Bastid, N; Basu, S; Bathen, B; Batigne, G; Battistin, M; Batyunya, B; Batzing, P C; Baudot, J; Baumann, C; Bearden, I G; Beck, H; Bedda, C; Behera, N K; Belikov, I; Bellini, F; Bellwied, R; Belmont-Moreno, E; Bencedi, G; Benettoni, M; Benotto, F; Beole, S; Berceanu, I; Bercuci, A; Berdnikov, Y; Berenyi, D; Berger, M E; Bertens, R A; Berzano, D; Besson, A; Betev, L; Bhasin, A; Bhati, A K; Bhatti, A; Bhattacharjee, B; Bhom, J; Bianchi, L; Bianchi, N; Bianchin, C; Bielcík, J; Bielcíková, J; Bilandzic, A; Bjelogrlic, S; Blanco, F; Blau, D; Blume, C; Bock, F; Boehmer, F V; Bogdanov, A; Boggild, H; Bogolyubsky, M; Boldizsár, L; Bombara, M; Book, J; Borel, H; Borissov, A; Bornschein, J; Borshchov, V N; Bortolin, C; Bossú, F; Botje, M; Botta, E; Böttger, S; Braun-Munzinger, P; Breitner, T; Broker, T A; Browning, T A; Broz, M; Bruna, E; Bruno, G E; Budnikov, D; Buesching, H; Bufalino, S; Buncic, P; Busch, O; Buthelezi, Z; Caffarri, D; Cai, X; Caines, H; Caliva, A; Calvo Villar, E; Camerini, P; Canoa Roman, V; Carena, F; Carena, W; Cariola, P; Carminati, F; Casanova Díaz, A; Castillo Castellanos, J; Casula, E A R; Catanescu, V; Caudron, T; Cavicchioli, C; Ceballos Sanchez, C; Cepila, J; Cerello, P; Chang, B; Chapeland, S; Charvet, J L; Chattopadhyay, S; Chattopadhyay, S; Cherney, M; Cheshkov, C; Cheynis, B; Chibante Barroso, V; Chinellato, D D; Chochula, P; Chojnacki, M; Choudhury, S; Christakoglou, P; Christensen, C H; Christiansen, P; Chujo, T; Chung, S U; Cicalo, C; Cifarelli, L; Cindolo, F; Claus, G; Cleymans, J; Colamaria, F; Colella, D; Coli, S; Colledani, C; Collu, A; Colocci, M; Conesa Balbastre, G; Conesa del Valle, Z; Connors, M E; Contin, G; Contreras, J G; Cormier, T M; Corrales Morales, Y; Cortese, P; Cortés Maldonado, I; Cosentino, M R; Costa, F; Crochet, P; Cruz Albino, R; Cuautle, E; Cunqueiro, L; Dainese, A; Dang, R; Danu, A; Da Riva, E; Das, D; Das, I; Das, K; Das, S; Dash, A; Dash, S; De, S; Decosse, C; Delagrange, H; Deloff, A; Dénes, E; D'Erasmo, G; de Barros, G O V; De Caro, A; de Cataldo, G; de Cuveland, J; De Falco, A; De Gruttola, D; De Marco, N; De Pasquale, S; De Robertis, G; De Roo, K; de Rooij, R; Diaz Corchero, M A; Dietel, T; Divià, R; Di Bari, D; Di Liberto, S; Di Mauro, A; Di Nezza, P; Djuvsland, o; Dobrin, A; Dobrowolski, T; Domenicis Gimenez, D; Dönigus, B; Dordic, O; Dorheim, S; Dorokhov, A; Doziere, G; Dubey, A K; Dubla, A; Ducroux, L; Dulinski, W; Dupieux, P; Dutta Majumdar, A K; Ehlers III, R J; Elia, D; Engel, H; Erazmus, B; Erdal, H A; Eschweiler, D; Espagnon, B; Estienne, M; Esumi, S; Evans, D; Evdokimov, S; Eyyubova, G; Fabris, D; Faivre, J; Falchieri, D; Fantoni, A; Fasel, M; Fehlker, D; Feldkamp, L; Felea, D; Feliciello, A; Feofilov, G; Ferencei, J; Fernández Téllez, A; Ferreiro, E G; Ferretti, A; Festanti, A; Figiel, J; Figueredo, M A S; Filchagin, S; Finogeev, D; Fionda, F M; Fiore, E M; Fiorenza, G; Floratos, E; Floris, M; Foertsch, S; Foka, P; Fokin, S; Fragiacomo, E; Francescon, A; Franco, M; Frankenfeld, U; Fuchs, U; Furget, C; Fusco Girard, M; Gaardhoje, J J; Gagliardi, M; Gajanana, D; Gallio, M; Gangadharan, D R; Ganoti, P; Garabatos, C; Garcia-Solis, E; Gargiulo, C; Garishvili, I; Gerhard, J; Germain, M; Gheata, A; Gheata, M; Ghidini, B; Ghosh, P; Ghosh, S K; Gianotti, P; Giubilato, P; Giubellino, P; Gladysz-Dziadus, E; Glässel, P; Gomez, R; Gomez Marzoa, M; González-Zamora, P; Gorbunov, S; Görlich, L; Gotovac, S; Graczykowski, L K; Grajcarek, R; Greiner, L C; Grelli, A; Grigoras, A; Grigoras, C; Grigoriev, V; Grigoryan, A; Grigoryan, S; Grinyov, B; Grion, N; Grondin, D; Grosse-Oetringhaus, J F; Grossiord, J -Y; Grosso, R; Guber, F; Guernane, R; Guerzoni, B; Guilbaud, M; Gulbrandsen, K; Gulkanyan, H; Gunji, T; Gupta, A; Gupta, R; H Khan, K; Haake, R; Haaland, o; Hadjidakis, C; Haiduc, M; Hamagaki, H; Hamar, G; Hanratty, L D; Hansen, A; Harris, J W; Hartmann, H; Harton, A; Hatzifotiadou, D; Hayashi, S; Heckel, S T; Heide, M; Helstrup, H; Hennes, E; Herghelegiu, A; Herrera Corral, G; Hess, B A; Hetland, K F; Hicks, B; Hillemanns, H; Himmi, A; Hippolyte, B; Hladky, J; Hristov, P; Huang, M; Hu-Guo, C; Humanic, T J; Hutter, D; Hwang, D S; Igolkin, S; Ijzermans, P; Ilkaev, R; Ilkiv, I; Inaba, M; Incani, E; Innocenti, G M; Ionita, C; Ippolitov, M; Irfan, M; Ivanov, M; Ivanov, V; Ivanytskyi, O; Jacholkowski, A; Jadlovsky, J; Jahnke, C; Jang, H J; Janik, M A; Jayarathna, P H S Y; Jena, S; Jimenez Bustamante, R T; Jones, P G; Jung, H; Junique, A; Jusko, A; Kalcher, S; Kalinak, P; Kalweit, A; Kamin, J; Kang, J H; Kaplin, V; Kar, S; Karasu Uysal, A; Karavichev, O; Karavicheva, T; Karpechev, E; Kebschull, U; Keidel, R; Keil, M; Ketzer, B; Khan, M Mohisin; Khan, P; Khan, S A; Khanzadeev, A; Kharlov, Y; Kileng, B; Kim, B; Kim, D; Kim, D W; Kim, D J; Kim, J S; Kim, M; Kim, M; Kim, S; Kim, T; Kirsch, S; Kisel, I; Kiselev, S; Kisiel, A; Kiss, G; Klay, J L; Klein, J; Klein-Bösing, C; Kluge, A; Knichel, M L; Knospe, A G; Kobdaj, C; Kofarago, M; Köhler, M K; Kollegger, T; Kolojvari, A; Kondratiev, V; Kondratyeva, N; Konevskikh, A; Kovalenko, V; Kowalski, M; Kox, S; Koyithatta Meethaleveedu, G; Kral, J; Králik, I; Kramer, F; Kravcáková, A; Krelina, M; Kretz, M; Krivda, M; Krizek, F; Krus, M; Krymov, E B; Kryshen, E; Krzewicki, M; Kucera, V; Kucheriaev, Y; Kugathasan, T; Kuhn, C; Kuijer, P G; Kulakov, I; Kumar, J; Kurashvili, P; Kurepin, A; Kurepin, A B; Kuryakin, A; Kushpil, S; Kushpil, V; Kweon, M J; Kwon, Y; Ladron de Guevara, P; Lagana Fernandes, C; Lakomov, I; Langoy, R; Lara, C; Lardeux, A; Lattuca, A; La Pointe, S L; La Rocca, P; Lea, R; Lee, G R; Legrand, I; Lehnert, J; Lemmon, R C; Lenhardt, M; Lenti, V; Leogrande, E; Leoncino, M; León Monzón, I; Lesenechal, Y; Lévai, P; Li, S; Lien, J; Lietava, R; Lindal, S; Lindenstruth, V; Lippmann, C; Lisa, M A; Listratenko, O M; Ljunggren, H M; Lodato, D F; Loddo, F; Loenne, P I; Loggins, V R; Loginov, V; Lohner, D; Loizides, C; Lopez, X; López Torres, E; Lu, X -G; Luettig, P; Lunardon, M; Luo, J; Luparello, G; Luzzi, C; M Gago, A; M Jacobs, P; Ma, R; Maevskaya, A; Mager, M; Mahapatra, D P; Maire, A; Malaev, M; Maldonado Cervantes, I; Malinina, L; Mal'Kevich, D; Maltsev, N A; Malzacher, P; Mamonov, A; Manceau, L; Manko, V; Manso, F; Manzari, V; Mapelli, A; Marchisone, M; Mares, J; Margagliotti, G V; Margotti, A; Marín, A; Marin Tobon, C A; Markert, C; Marquard, M; Marras, D; Martashvili, I; Martin, N A; Martinengo, P; Martínez, M I; Martínez García, G; Martin Blanco, J; Martynov, Y; Mas, A; Masciocchi, S; Masera, M; Maslov, M; Masoni, A; Massacrier, L; Mastroserio, A; Mattiazzo, S; Matyja, A; Mayer, C; Mazer, J; Mazumder, R; Mazza, G; Mazzoni, M A; Meddi, F; Menchaca-Rocha, A; Mercado Pérez, J; Meres, M; Miake, Y; Mikhaylov, K; Milano, L; Milosevic, J; Mischke, A; Mishra, A N; Miskowiec, D; Mitu, C M; Mlynarz, J; Mohanty, B; Molnar, L; Mongelli, M; Montaño Zetina, L; Montes, E; Morando, M; Moreira De Godoy, D A; Morel, F; Moretto, S; Morreale, A; Morsch, A; Muccifora, V; Mudnic, E; Muhammad Bhopal, F; Muhuri, S; Mukherjee, M; Müller, H; Munhoz, M G; Murray, S; Musa, L; Musinsky, J; Nandi, B K; Nania, R; Nappi, E; Nattrass, C; Nayak, T K; Nazarenko, S; 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Porteboeuf-Houssais, S; Porter, J; Pospisil, V; Potukuchi, B; Prasad, S K; Preghenella, R; Prino, F; Protsenko, M A; Pruneau, C A; Pshenichnov, I; Puddu, G; Puggioni, C; Punin, V; Putschke, J; Qvigstad, H; Rachevski, A; Raha, S; Rak, J; Rakotozafindrabe, A; Ramello, L; Raniwala, R; Raniwala, S; Räsänen, S S; Rascanu, B T; Rasson, J E; Rathee, D; Rauf, A W; Razazi, V; Read, K F; Real, J S; Redlich, K; Reed, R J; Rehman, A; Reichelt, P; Reicher, M; Reidt, F; Renfordt, R; Reolon, A R; Reshetin, A; Rettig, F; Revol, J -P; Reygers, K; Riabov, V; Ricci, R A; Richert, T; Richter, M; Riedler, P; Riegler, W; Riggi, F; Rivetti, A; Rocco, E; Rodríguez Cahuantzi, M; Rodriguez Manso, A; Roed, K; Rogochaya, E; Rohni, S; Rohr, D; Röhrich, D; Romita, R; Ronchetti, F; Ronflette, L; Rosnet, P; Rossegger, S; Rossewij, M J; Rossi, A; Roudier, S; Rousset, J; Roy, A; Roy, C; Roy, P; Rubio Montero, A J; Rui, R; Russo, R; Ryabinkin, E; Ryabov, Y; Rybicki, A; Sacchetti, M; Sadovsky, S; Safarík, K; Sahlmuller, B; Sahoo, R; Sahu, P K; Saini, J; Salgado, C A; Salzwedel, J; Sambyal, S; Samsonov, V; Sanchez Castro, X; Sánchez Rodríguez, F J; sándor, L; Sandoval, A; Sano, M; Santagati, G; Santoro, R; Sarkar, D; Scapparone, E; Scarlassara, F; Scharenberg, R P; Schiaua, C; Schicker, R; Schipper, J D; Schmidt, C; Schmidt, H R; Schuchmann, S; Schukraft, J; Schulc, M; Schuster, T; Schutz, Y; Schwarz, K; Schweda, K; Scioli, G; Scomparin, E; Scott, P A; Scott, R; Segato, G; Seger, J E; Selyuzhenkov, I; Senyukhov, S; Seo, J; Serradilla, E; Sevcenco, A; Sgura, I; Shabetai, A; Shabratova, G; Shahoyan, R; Shangaraev, A; Sharma, N; Sharma, S; Shigaki, K; Shtejer, K; Sibiriak, Y; Siddhanta, S; Siemiarczuk, T; Silvermyr, D; Silvestre, C; Simatovic, G; Singaraju, R; Singh, R; Singha, S; Singhal, V; Sinha, B C; Sinha, T; Sitar, B; Sitta, M; Skaali, T B; Skjerdal, K; Smakal, R; Smirnov, N; Snellings, R J M; Snoeys, W; Sogaard, C; Soltz, R; Song, J; Song, M; Sooden, V; Soramel, F; Sorensen, S; Spacek, M; spalek, J; Spiriti, E; Sputowska, I; Spyropoulou-Stassinaki, M; Srivastava, B K; Stachel, J; Stan, I; Stefanek, G; Steinpreis, M; Stenlund, E; Steyn, G; Stiller, J H; Stocco, D; Stolpovskiy, M; Strmen, P; Suaide, A A P; Subieta Vasquez, M A; Sugitate, T; Suire, C; Suleymanov, M; suljic, M; Sultanov, R; sumbera, M; Sun, X; Susa, T; Symons, T J M; Szanto de Toledo, A; Szarka, I; Szczepankiewicz, A; Szymanski, M; Takahashi, J; Tangaro, M A; Tapia Takaki, J D; Tarantola Peloni, A; Tarazona Martinez, A; Tauro, A; Tejeda Muñoz, G; Telesca, A; Terrevoli, C; Ter Minasyan, A; Thäder, J; Thomas, D; Tieulent, R; Timmins, A R; Toia, A; Torii, H; Trubnikov, V; Trzaska, W H; Tsuji, T; Tumkin, A; Turchetta, R; Turrisi, R; Tveter, T S; Tymchuk, I T; Ulery, J; Ullaland, K; Uras, A; Usai, G L; Vajzer, M; Vala, M; Valencia Palomo, L; Valentino, V; Valin, I; Vallero, S; Vande Vyvre, P; Vannucci, L; Van Der Maarel, J; Van Hoorne, J W; van Leeuwen, M; Vargas, A; Varma, R; Vasileiou, M; Vasiliev, A; Vasta, P; Vechernin, V; Veldhoen, M; Velure, A; Venaruzzo, M; Vercellin, E; Vergara Limón, S; Verlaat, B; Vernet, R; Verweij, M; Vickovic, L; Viesti, G; Viinikainen, J; Vilakazi, Z; Villalobos Baillie, O; Vinogradov, A; Vinogradov, L; Vinogradov, Y; Virgili, T; Viyogi, Y P; Vodopyanov, A; Völkl, M A; Voloshin, K; Voloshin, S A; Volpe, G; von Haller, B; Vorobyev, I; Vranic, D; Vrláková, J; Vulpescu, B; Vyushin, A; Wagner, B; Wagner, J; Wagner, V; Wang, M; Wang, Y; Watanabe, D; Weber, M; Wessels, J P; Westerhoff, U; Wiechula, J; Wikne, J; Wilde, M; Wilk, G; Wilkinson, J; Williams, M C S; Windelband, B; Winn, M; Winter, M; Xiang, C; Yaldo, C G; Yamaguchi, Y; Yang, H; Yang, P; Yang, S; Yano, S; Yasnopolskiy, S; Yi, J; Yin, Z; Yoo, I -K; Yushmanov, I; Zaccolo, V; Zach, C; Zaman, A; Zampolli, C; Zaporozhets, S; Zarochentsev, A; Závada, P; Zaviyalov, N; Zbroszczyk, H; Zgura, I S; Zhalov, M; Zhang, F; Zhang, H; Zhang, X; Zhang, Y; Zhao, C; Zherebchevsky, V I; Zhou, D; Zhou, F; Zhou, Y; Zhu, H; Zhu, J; Zhu, X; Zichichi, A; Zimmermann, A; Zinovjev, G; Zoccarato, Y; Zynovyev, M; Zyzak, M; CERN. Geneva. The LHC experiments Committee; LHCC

    2014-01-01

    The long term goal of the ALICE experiment is to provide a precise characterization of the high-density, high-temperature phase of strongly interacting matter. To achieve this goal, high-statistics precision measurement are required. The general upgrade strategy for the ALICE detector is conceived to deal with this challenge with expected Pb-Pb interaction rates of up to 50 kHz aiming at an integrated luminosity of the order of 10 nb^-1. With the proposed timeline, starting the high-rate operation progressively after 2018 shutdown, the goals set up in our upgrade plans should be achieved collecting data until mid-2020's. In this document we present the main physics motivations for running the LHC with heavy ions at high luminosities and discuss the modifications and replacements needed in the ALICE detectors, the online systems and offline system. The schedule, cost estimate and organization of the upgrade programme are presented as well.

  7. AliEn: ALICE Environment on the GRID

    CERN Multimedia

    Bagnasco, S; Buncic, P; Carminati, F; Cirstoiu, C; Grigoras, C; Hayrapetyan, A; Harutyunyan, A; Peters, A J; Saiz, P

    2007-01-01

    Starting from mid-2008, the ALICE detector at CERN LHC will collect data at a rate of 4PB per year. ALICE will use exclusively distributed Grid resources to store, process and analyse this data. The top-level management of the Grid resources is done through the AliEn (ALICE Environment) system, which is in continuous development since year 2000. AliEn presents several original solutions, which have shown their viability in a number of large exercises of increasing complexity called Data Challenges. This paper describes the AliEn architecture: Job Management, Data Management and UI. The current status of AliEn will be illustrated, as well as the performance of the system during the data challenges. The paper also describes the future AliEn development roadmap.

  8. Computing Architecture of the ALICE Detector Control System

    CERN Document Server

    Augustinus, A; Moreno, A; Kurepin, A N; De Cataldo, G; Pinazza, O; Rosinský, P; Lechman, M; Jirdén, L S

    2011-01-01

    The ALICE Detector Control System (DCS) is based on a commercial SCADA product, running on a large Windows computer cluster. It communicates with about 1200 network attached devices to assure safe and stable operation of the experiment. In the presentation we focus on the design of the ALICE DCS computer systems. We describe the management of data flow, mechanisms for handling the large data amounts and information exchange with external systems. One of the key operational requirements is an intuitive, error proof and robust user interface allowing for simple operation of the experiment. At the same time the typical operator task, like trending or routine checks of the devices, must be decoupled from the automated operation in order to prevent overload of critical parts of the system. All these requirements must be implemented in an environment with strict security requirements. In the presentation we explain how these demands affected the architecture of the ALICE DCS.

  9. The ALICE Silicon Pixel Detector Control and Calibration Systems

    CERN Document Server

    Calì, Ivan Amos; Manzari, Vito; Stefanini, Giorgio

    2008-01-01

    The work presented in this thesis was carried out in the Silicon Pixel Detector (SPD) group of the ALICE experiment at the Large Hadron Collider (LHC). The SPD is the innermost part (two cylindrical layers of silicon pixel detec- tors) of the ALICE Inner Tracking System (ITS). During the last three years I have been strongly involved in the SPD hardware and software development, construction and commissioning. This thesis is focused on the design, development and commissioning of the SPD Control and Calibration Systems. I started this project from scratch. After a prototyping phase now a stable version of the control and calibration systems is operative. These systems allowed the detector sectors and half-barrels test, integration and commissioning as well as the SPD commissioning in the experiment. The integration of the systems with the ALICE Experiment Control System (ECS), DAQ and Trigger system has been accomplished and the SPD participated in the experimental December 2007 commissioning run. The complex...

  10. The ALICE Project at the IPN, Orsay
    R&D and software developments 1996-2003

    OpenAIRE

    Maccormick, Marion

    2007-01-01

    This document describes the main steps in the R&D carried out for the station 1 Cathode Pad Chambers of the Dimuon Arm Spectrometer in the ALICE experiment, recently installed at the LHC. It includes details addressing different experimental aspects - including electronics, mechanical construction, detector modelling, physics and test beam simulations, object oriented mapping algorithms and prototype test beam results. It is written with the novice experimentalist in mind.; Ce document décrit...

  11. La pionera oculta: Alice Guy en el origen del cine

    OpenAIRE

    Lucas Ramón, Irene de

    2011-01-01

    Alice Guy es una pionera de la cinematografía en los orígenes del cine, sin embargo, ha sido sistemáticamente excluida de tal consideración en la Historia del cine. A pesar de que su obra muestra méritos y aportaciones suficientes para ser reconocida como tal, el tratamiento que ha recibido en la historiografía general hasta la actualidad no lo refleja así. Asistimos pues a una infravaloración de la importancia, de la trascendencia de la figura de Alice Guy y su obra respecto al del resto de ...

  12. Probe station for testing of ALICE silicon drift detectors

    CERN Document Server

    Humanic, T J; Piemonte, C; Rashevsky, A; Sugarbaker, E R; Vacchi, A

    2003-01-01

    Large area, 7.25 cm multiplied by 8.76 cm silicon drift detectors have been developed and are in production for the ALICE experiment at LHC. An active area of the detector of more than 50 cm**2 imposes high demands on the quality of processing and raw material. Automated testing procedures have been developed to test detectors before mounting them on the ladders. Probe stations for ALICE SDD testing were designed and built at INFN, Trieste and Ohio State University (OSU). Testing procedures, detector selection criteria and some details of the OSU probe station design are discussed.

  13. Evénements ALICE - French version only

    CERN Document Server

    2004-01-01

    Le 29 septembre 2004 à 15h00, programme « A la rencontre d'ALICE », à la Médiathèque municipale de Saint-Genis-Pouilly, France. Histoire pour des enfants (à partir de 8 ans), extraite de la bande dessinée: « ALICE et la soupe de quarks et de gluons ». Le 2 octobre 2004 à 11h00, programme « A la rencontre d'ALICE », à la Médiathèque municipale de Saint-Genis-Pouilly, France. Présentation ALICE pour les adolescents (à partir de 14 ans).

  14. Prototype readout electronics for the upgraded ALICE Inner Tracking System

    Science.gov (United States)

    Sielewicz, K. M.; Aglieri Rinella, G.; Bonora, M.; Ferencei, J.; Giubilato, P.; Rossewij, M. J.; Schambach, J.; Vanat, T.

    2017-01-01

    The ALICE Collaboration is preparing a major upgrade to the experimental apparatus. A key element of the upgrade is the construction of a new silicon-based Inner Tracking System containing 12 Gpixels in an area of 10 m2. Its readout system consists of 192 readout units that control the pixel sensors and the power units, and deliver the sensor data to the counting room. A prototype readout board has been designed to test: the interface between the sensor modules and the readout electronics, the signal integrity and reliability of data transfer, the interface to the ALICE DAQ and trigger, and the susceptibility of the system to the expected radiation level.

  15. Integrated plan for LArTPC neutrino detectors in the US

    Energy Technology Data Exchange (ETDEWEB)

    Baller, B.; Fleming, B.; /Fermilab

    2009-11-01

    We present an integrated R&D plan aimed at demonstrating the ability to build a very large Liquid Argon Time Projection Chamber (LArTPC), on a scale suitable for use as a Far Detector for the LBNE neutrino oscillation experiment. This plan adopts current LArTPC R&D-related activities and proposes new ones to address questions that go beyond those being answered by the current efforts. We have employed a risk evaluation strategy to identify questions that can be answered (or risks that can be mitigated) through one or more R&D steps. In summary form, the plan consists of the following pre-existing components: (1) The Materials Test Stand program, now in operation at Fermilab, addressing questions pertaining to maintenance of argon purity; (2) Existing electronics test stands at FNAL and BNL; (3) The Liquid Argon Purity Demonstrator (LAPD) now being assembled at Fermilab; (4) The ArgoNeuT prototype LArTPC, now running in the NuMI beam; (5) The MicroBooNE experiment, proposed as a physics experiment that will advance our understanding of the LArTPC technology, now completing its conceptual design phase; (6) A software development effort that is well integrated across present and planned LArTPC detectors. We are proposing to add to these efforts the following: (1) A membrane cryostat mechanical prototype to evaluate and gain expertise with this technology; (2) An installation and integration prototype, to understand issues pertaining to detector assembly, particularly in an underground environment; (3) A {approx} 5% scale electronics systems test to understand system-wide issues as well as individual component reliability. (4) A calibration test stand that would consist of a small TPC to be exposed to a test beam for calibration studies, relevant for evaluation of physics sensitivities. We have developed a timeline and milestones for achieving these goals as discussed in Section 4. The proposed activities necessary for the final design of LAr20 are complete by CD3 in

  16. Measurement of electrons from semi-leptonic heavy-flavour hadron decays in p-Pb collisions at √(s{sub NN}) = 5.02 TeV with the ALICE TRD

    Energy Technology Data Exchange (ETDEWEB)

    Fleck, Martin [Heidelberg University (Germany); Collaboration: ALICE-Collaboration

    2015-07-01

    Heavy quarks (charm and beauty), only produced in the initial hard scattering processes, constitute an important way to probe features of the Quark-Gluon Plasma. However, suppression effects that are seen in Pb-Pb collisions in comparison to p-p results can be regarded as a property of the Quark-Gluon Plasma after non-QGP nuclear effects in the study of proton-nucleus collisions have been quantified. For this purpose the ALICE TPC and TRD were used to measure semi-leptonic decays of heavy-flavoured hadrons, where especially the TRD electron identification capability contributes to the results. The procedure of the analysis of p-Pb LHC data of 2013 is explained and first results are shown.

  17. Test and commissioning of the CARLOS control boards for the ALICE Silicon Drift Detectors

    CERN Document Server

    Alessandro, Bruno; Beolè, S; Coli, S; Costa, F; De Remigis, P; Falchieri, Davide; Gandolfi, Enzo; Giraudo, G; Giubellino, P; Kral, J F; Masetti, Massimo; Mazza, G; Rashevsky, A; Riccati, Lodovico; Rivetti, A; Senyukov, S; Toscano, Letterio; Tosello, F; Wheadon, R

    2007-01-01

    This paper presents the test strategy employed during the installation of the CARLOS end ladder boards developed for the Silicon Drift Detectors (SDD) of ALICE. Each CARLOS board compresses the data provided by the front-end electronics of one SDD and sends them via an optical link of 800 Mbit/s to the data concentrator card (CARLOSrx) located in the counting room. The paper describes the integration of the CARLOS boards in the final SDD system, including its cooling and mechanical support, the power supply distribution and the optical interconnections. The results of the tests performed after each step of the installation sequence are reported.

  18. ALICE inner tracking system readout electronics prototype testing with the CERN ``Giga Bit Transceiver''

    Science.gov (United States)

    Schambach, J.; Rossewij, M. J.; Sielewicz, K. M.; Aglieri Rinella, G.; Bonora, M.; Ferencei, J.; Giubilato, P.; Vanat, T.

    2016-12-01

    The ALICE Collaboration is preparing a major detector upgrade for the LHC Run 3, which includes the construction of a new silicon pixel based Inner Tracking System (ITS). The ITS readout system consists of 192 readout boards to control the sensors and their power system, receive triggers, and deliver sensor data to the DAQ. To prototype various aspects of this readout system, an FPGA based carrier board and an associated FMC daughter card containing the CERN Gigabit Transceiver (GBT) chipset have been developed. This contribution describes laboratory and radiation testing results with this prototype board set.

  19. Assembly procedure of the module (half-stave) of the ALICE Silicon Pixel Detector

    CERN Document Server

    Caselle, M; Antinori, F; Burns, M; Campbell, M; Chochula, P; Dinapoli, R; Elia, D; Formenti, F; Fini, R A; Ghidini, B; Kluge, A; Lenti, V; Manzari, V; Meddi, F; Morel, M; Navach, F; Nilsson, P; Pepato, Adriano; Riedler, P; Santoro, R; Stefanini, G; Viesti, G; Wyllie, K

    2004-01-01

    The Silicon Pixel Detector (SPD) forms the two innermost layers of the ALICE Inner Tracking System (ITS). The detector includes 1200 readout ASICs, each containing 8192 pixel cells, bump-bonded to Si sensor elements. The thickness of the readout chip and the sensor element is 150mum and 200mum, respectively. Low-mass solutions are implemented for the bus and the mechanical support. In this contribution, we describe the basic module (half-stave) of the two SPD layers and we give an overview of its assembly procedure.

  20. Magnetic Field Requirements for a Detector at the Linear Collider Using a TPC as Main Tracking Device

    CERN Document Server

    Klempt, W

    2010-01-01

    This note describes the requirements to the magnetic field which occur in an ILD like detector at ILC or CLIC. In particular we describe requirements introduced by choosing a TPC as main tracking detector.

  1. On distortions of TPC coordinates: inhomogeneities of electric and magnetic field

    CERN Document Server

    Dydak, F

    2003-01-01

    After a general discussion of electron drift in a gas volume with electric and magnetic fields, distortions in the r and r phi coordinates arising from inhomogeneities of the electric and magnetic fields in the HARP TPC are calculated. Inhomogeneities of the electric field arise from i) positive ions released by cosmic rays, ii) positive ions released by interaction secondaries, iii) positive ions released by beam muons, iv) positive ions released from beam particles downstream of the inner field cage, and v) a high voltage misalignment between the outer and inner field cages. Also, distortions arising from the inhomogeneity of the magnetic field are calculated. These effects resolve the controversy on unphysical numbers of 'wrong-charge' TPC tracks. The bad news are that effects are too big to be neglected. The good news are that, with enough sweat and tears, they can be adequately corrected.

  2. Energy calibration of a GEM-TPC prototype with 83mKr

    Science.gov (United States)

    Schmitz, Roman

    2012-05-01

    A GEM-TPC has been built as a 10% scale prototype for the P¯ANDA experiment and as a full-scale prototype for the CBELSA/TAPS experiment (Fabbietti L, et al: Nucl Instrum Methods A 628:204, 2011). The intrinsic suppression of ion backflow into the drift volume makes it suitable for high rate/background environments. The GEM-TPC has been used as an inner tracking update for the FOPI experiment at GSI where cosmic and beam tests were performed. For calibration purposes a 83Rb source has been produced at the Bonn HISKP Cyclotron. Using the isomeric 83mKr evaporated by the source, a relative channel-wise gain calibration as well as gain estimation for different high voltage settings could be performed.

  3. Performance of the ALICE experiment at the CERN LHC

    NARCIS (Netherlands)

    Meddi, F.; Menchaca-Rocha, A.; Meninno, E.; Mercado Pérez, J.; Meres, M.; Miake, Y.; Mikhaylov, K.; Milano, L.; Milosevic, J.; Mischke, A.; Mishra, A. N.; Mis̈kowiec, D.; Mitu, C. M.; Mlynarz, J.; Mohanty, B.; Molnar, L.; Montano Zetina, L.; Montes, E.; Morando, M.; Moreira De Godoy, D. A.; Moretto, S.; Morreale, A.; Morsch, A.; Muccifora, V.; Mudnic, E.; Muhuri, S.; Mukherjee, M.; Müller, H.; Munhoz, M. G.; Murray, S.; Musa, L.; Musinsky, J.; Nandi, B. K.; Nania, R.; Nappi, E.; Nattrass, C.; Nayak, T. K.; Nazarenko, S.; Nedosekin, A.; Nicassio, M.; Niculescu, M.; Nielsen, B. S.; Nikolaev, S.; Nikulin, S.; Nikulin, V.; Nilsen, B. S.; Noferini, F.; Nomokonov, P.; Nooren, G.; Nyanin, A.; Nystrand, J.; Oeschler, H.; Oh, S.; Oh, S. K.; Okatan, A.; Olah, L.; Oleniacz, J.; Oliveira Da Silva, A. C.; Onderwaater, J.; Oppedisano, C.; Ortiz Velasquez, A.; Oskarsson, A.; Twinowski, J.; Oyama, K.; Sahoo, P.; Pachmayer, Y.; Pachr, M.; Pagano, P.; Paić, G.; Painke, F.; Pajares, C.; Pal, S. K.; Palmeri, A.; Pant, D.; Papikyan, V.; Pappalardo, G. S.; Pareek, P.; Park, W. J.; Parmar, S.; Passfeld, A.; Patalakha, D. I.; Paticchio, V.; Paul, B.; Pawlak, T.; Peitzmann, T.; Pereira Da Costa, H.; Pereira De Oliveira Filho, E.; Peresunko, D.; Pérez Lara, C. E.; Pesci, A.; Pestov, Y.; Petráček, V.; Petran, M.; Petris, M.; Petrovici, M.; Petta, C.; Piano, S.; Pikna, M.; Pillot, P.; Pinazza, O.; Pinsky, L.; Piyarathna, D. B.; Ploskoń, M.; Planinic, M.; Pluta, J.; Pochybova, S.; Podesta-Lerma, P. L M; Poghosyan, M. G.; Pohjoisaho, E. H O; Polichtchouk, B.; Poljak, N.; Pop, A.; Porteboeuf-Houssais, S.; Porter, J.; Pospisil, V.; Potukuchi, B.; Prasad, S. K.; Preghenella, R.; Prino, F.; Pruneau, C. A.; Pshenichnov, I.; Puccio, M.; Puddu, G.; Punin, V.; Putschke, J.; Qvigstad, H.; Rachevski, A.; Raha, S.; Rak, J.; Rakotozafindrabe, A.; Ramello, L.; Raniwala, R.; Raniwala, S.; Räsänen, S. S.; Rascanu, B. T.; Rathee, D.; Rauf, A. W.; Razazi, V.; Read, K. F.; Real, J. S.; Redlich, K.; Reed, R. J.; Rehman, A.; Reichelt, P.; Reicher, M.; Reidt, F.; Renfordt, R.; Reolon, A. R.; Reshetin, A.; Rettig, F.; Revol, J. P.; Reygers, K.; Riabov, V.; Ricci, R. A.; Richert, T.; Richter, M.; Riedler, P.; Riegler, W.; Riggi, F.; Rivetti, A.; Rocco, E.; Rodríguez Cahuantzi, M.; Rodriguez Manso, A.; Rd, K.; Rogochaya, E.; Rohni, S.; Rohr, D.; Röhrich, D.; Romita, R.; Ronchetti, F.; Ronflette, L.; Rosnet, P.; Rossegger, S.; Rossi, A.; Roukoutakis, F.; Roy, A.; Roy, C.; Roy, P.; Rubio Montero, A. J.; Rui, R.; Russo, R.; Ryabinkin, E.; Ryabov, Y.; Rybicki, A.; Sadovsky, S.; Safarík, K.; Sahlmuller, B.; Sahoo, R.; Sahu, P. K.; Saini, J.; Salgado, C. A.; Salzwedel, J.; Sambyal, S.; Samsonov, V.; Sanchez Castro, X.; Sánchez Rodríguez, F. J.; Sándor, L.; Sandoval, A.; Sano, M.; Santagati, G.; Sarkar, D.; Scapparone, E.; Scarlassara, F.; Scharenberg, R. P.; Schiaua, C.; Schicker, R.; Schmidt, C.; Schmidt, H. R.; Schuchmann, S.; Schukraft, J.; Schulc, M.; Schuster, T.; Schutz, Y.; Schwarz, K.; Schweda, K.; Scioli, G.; Scomparin, E.; Scott, P. A.; Scott, R.; Segato, G.; Seger, J. E.; Selyuzhenkov, I.; Seo, J.; Serradilla, E.; Sevcenco, A.; Shabetai, A.; Shabratova, G.; Shahoyan, R.; Shangaraev, A.; Sharma, N.; Sharma, S.; Shigaki, K.; Shtejer, K.; Sibiriak, Y.; Siddhanta, S.; Siemiarczuk, T.; Silvermyr, D.; Silvestre, C.; Simatovic, G.; Singaraju, R.; Singh, R.; Singha, S.; Singhal, V.; Sinha, C. B.; Sinha, T.; Sitar, B.; Sitta, M.; Skaali, T. B.; Skjerdal, K.; Smakal, R.; Smirnov, N.; Snellings, R. J M; Saard, C.; Soltz, R.; Song, J.; Song, M.; Soramel, F.; Sorensen, S.; Spacek, M.; Sputowska, I.; Spyropoulou-Stassinaki, M.; Srivastava, B. K.; Stachel, J.; Stan, I.; Stefanek, G.; Steinpreis, M.; Stenlund, E.; Steyn, G.; Stiller, J. H.; Stocco, D.; Stolpovskiy, M.; Strmen, P.; Suaide, A. A P; Subieta Vasquez, M. A.; Sugitate, T.; Suire, C.; Suleymanov, M.; Sultanov, R.; Sumbera, M.; Susa, T.; Symons, T. J M; Szanto De Toledo, A.; Szarka, I.; Szczepankiewicz, A.; Szymanski, M.; Takahashi, J.; Tangaro, M. A.; Tapia Takaki, J. D.; Tarantola Peloni, A.; Tarazona Martinez, A.; Tarzila, M. G.; Tauro, A.; Tejeda Muñoz, G.; Telesca, A.; Terrevoli, C.; Ter Minasyan, A.; Thäder, J.; Thomas, D.; Tieulent, R.; Timmins, A. R.; Toia, A.; Torii, H.; Trubnikov, V.; Trzaska, W. H.; Tsuji, T.; Tumkin, A.; Turrisi, R.; Tveter, T. S.; Ulery, J.; Ullaland, K.; Uras, A.; Usai, G. L.; Vajzer, M.; Vala, M.; Valencia Palomo, L.; Vallero, S.; Vande Vyvre, P.; Vannucci, L.; Van Der Maarel, J.; Van Hoorne, J. W.; Van Leeuwen, M.; Vargas, A.; Varma, R.; Vasileiou, M.; Vasiliev, A.; Vechernin, V.; Veldhoen, M.; Velure, A.; Venaruzzo, M.; Vercellin, E.; Vergara Limón, S.; Vernet, R.; Verweij, M.; Vickovic, L.; Viesti, G.; Viinikainen, J.; Vilakazi, Z.

    2014-01-01

    ALICE is the heavy-ion experiment at the CERN Large Hadron Collider. The experiment continuously took data during the first physics campaign of the machine from fall 2009 until early 2013, using proton and lead-ion beams. In this paper we describe the running environment and the data handling proced

  4. The “24 hours” of the ALICE magnet

    CERN Multimedia

    2005-01-01

    The ALICE dipole magnet, now in its final location in the cavern at Point 2 , has run at full current for 24 hours. The dipole of the ALICE muon spectrometer has successfully completed new tests in its final position. The ALICE detector is based on two large magnets - the big solenoid magnet formerly used by L3 on LEP, and a new dipole magnet, built through a strong and successful collaboration with a team from JINR in Russia, under the direction of Detlef Swoboda from TS-LEA at CERN. By October 2004, the dipole had been assembled in a preliminary position in the ALICE cavern, and in November it successfully passed extensive testing (CERN Bulletin 04/05). Now it has been transferred to its final position on the far side of the L3 solenoid, and has passed tests with flying colours. The first â€ワpre-assembly” was necessary to perform all the remaining machining operations for fixing the coils and to verify the assembly tooling, as the available space in the final location is very limited and does no...

  5. Alice Walker's Womanism Colored in The Color Purple

    Institute of Scientific and Technical Information of China (English)

    蒋慧慧

    2009-01-01

    In her famous novel The Color Purple,Alice Walker's womanism is colored by four kinds of conseiousness-female consciousness,racial consciousness,root-seeking consciousness,and universal consciousness.It is owing to the womanism that the heroine celie grown from an abused woman to an independent selfhood.

  6. Measurement of Forward-Backward Charged Particle Correlations with ALICE

    DEFF Research Database (Denmark)

    Søgaard, Carsten

    Part I of the defence covers experimental development carried out in the ALICE experiment at the Large Hadron Collider at the European Organisation for Nuclear Research - CERN. For the Time Projection Chamber a sophisticated laser calibration system has been developed by the Niels Bohr Institute...

  7. Search for Krypton 81 at Alice Accelerator Facility

    Science.gov (United States)

    Sabir, A.; Brissaud, I.; Kalifa, J.; Laurent, H.; Roynette, J. C.

    1982-08-01

    81Kr concentration measurements is a good clock for the old groundwater dating because of its chemical stability and of its atmospheric production. Unfortunately its presence in natural samples is very low. In this paper we report an experiment to measure the 81Kr concentration by means of the ALICE facility.

  8. ALICE breaks through the one Gigabyte/sec barrier

    CERN Multimedia

    2003-01-01

    The test phases of the ALICE data acquisition system, known as the Data Challenges, are celebrating their fourth anniversary. The fruit of collaboration between several of the experiment's groups and IT Division, the 2002 tests concentrated on the system's performance and stability.

  9. Romanian Physicists at CERN work for the Alice Program

    CERN Multimedia

    2007-01-01

    "For the past six years a team of Romanian scientists from the Institute of Nuclear Physics in Magurele, Romania, work as part of an international team of CERN to recreate the very first moments of the Universe, right after the Big Bang. The experiment was called Alice."(2 pages)

  10. Study of the photon identification efficiency with ALICE photon spectrometer

    Institute of Scientific and Technical Information of China (English)

    MAO Ya-Xian; ZHOU Dai-Cui; XU Chun-Cheng; YIN Zhong-Bao

    2008-01-01

    The efficiency for the detection and identification of photons with the ALICE PHOton Spectrometer PHOS has been studied with the Monte-Carlo generated data. In particular, the influence on the efficiency of the PHOS-module edge-effect and of the material in front of PHOS have been examined.

  11. Managing Infrastructure in the ALICE Detector Control System

    CERN Document Server

    Lechman, M; Bond, P M; Chochula, P.Ch; Kurepin, A N; Pinazza, O; Rosinsky, P; Kurepin, A N; Pinazza, O

    2014-01-01

    The main role of the ALICE Detector Control System (DCS) is to ensure safe and efficient operation of one of the large high energy physics experiments at CERN. The DCS design is based on the commercial SCADA software package WinCC Open Architecture.

  12. Award for Distinguished Scientific Contributions: Alice H. Eagly

    Science.gov (United States)

    American Psychologist, 2009

    2009-01-01

    Alice H. Eagly, winner of the Award for Distinguished Scientific Contributions, is cited for her work in the field of social psychology, the psychology of gender, and the use of meta-analytic techniques. She envisions a psychology that extends from individual cognitions to societal structures. In addition to the citation, a biography and selected…

  13. Overview of recent azimuthal correlation measurements from ALICE

    CERN Document Server

    INSPIRE-00290856

    2016-01-01

    Azimuthal correlations are a powerful tool to probe the properties and the evolution of the collision system. In this proceedings, we will review the recent azimuthal correlation measurements from ALICE at the LHC. The comparison to other experimental measurements and various theoretical calculations will be discussed as well.

  14. Search for H-dibaryon at J-PARC with a Large Acceptance TPC

    Directory of Open Access Journals (Sweden)

    Sako H.

    2014-03-01

    Full Text Available H-dibaryon has been predicted as a stable 6-quark color-singlet state. It has been searched for by many experiments but has never been discovered. Recent lattice QCD calculations predict H-dibaryon as a weakly bound or a resonant state close to the LL threshold. E224 and E522 experiments at KEK observed peaks in LL invariant mass spectra near the threshold in (K-, K+ reactions, which were statistically not significant. Therefore, we proposed a new experiment E42 at J-PARC. It will measure decay products of ΛΛ and Λπ-p in a (K-, K+ reaction. We design a large acceptance spectrometer based on a Time Projection Chamber (TPC immersed in a dipole magnetic field. The TPC surrounds a target to cover nearly 4π acceptance, and accepts K- beams up to 106 counts per second. To suppress drift field distortion at high beam rates, we adopt Gas Electron Multipliers (GEMs for electron amplification and a gating grid. We show an overview of the experiment, the design of the spectrometer, and the R&D status of the TPC prototype.

  15. Optical Readout of a Two Phase Liquid Argon TPC using CCD Camera and TGEMs

    CERN Document Server

    Mavrokoridis, K; Carroll, J; Lazos, M; McCormick, K J; Smith, N A; Touramanis, C; Walker, J

    2014-01-01

    This paper presents a preliminary study into the use of CCDs to image secondary scintillation light generated by Thick Gas Electron Multipliers (TGEMs) in a two phase LAr TPC. A Sony ICX285AL CCD chip was mounted above a double TGEM in the gas phase of a 40 litre two-phase LAr TPC with the majority of the camera electronics positioned externally via a feedthrough. An Am-241 source was mounted on a rotatable motion feedthrough allowing the positioning of the alpha source either inside or outside of the field cage. Developed for and incorporated into the TPC design was a novel high voltage feedthrough featuring LAr insulation. Furthermore, a range of webcams were tested for operation in cryogenics as an internal detector monitoring tool. Of the range of webcams tested the Microsoft HD-3000 (model no:1456) webcam was found to be superior in terms of noise and lowest operating temperature. In ambient temperature and atmospheric pressure 1 ppm pure argon gas, the TGEM gain was approximately 1000 and using a 1 msec...

  16. Gamma-ray imaging with a large micro-TPC and a scintillation camera

    Energy Technology Data Exchange (ETDEWEB)

    Hattori, K. [Graduate School of Science, Department of Physics, Kyoto University Kitashirakawa, Sakyo, Kyoto 606-8502 (Japan)], E-mail: hattori@cr.scphys.kyoto-u.ac.jp; Kabuki, S.; Kubo, H.; Kurosawa, S.; Miuchi, K. [Graduate School of Science, Department of Physics, Kyoto University Kitashirakawa, Sakyo, Kyoto 606-8502 (Japan); Nagayoshi, T. [Advanced Research Institute for Science and Engineering, Waseda University, 17 Kikui-cho, Shinjuku 162-0044, Tokyo (Japan); Nishimura, H.; Okada, Y. [Graduate School of Science, Department of Physics, Kyoto University Kitashirakawa, Sakyo, Kyoto 606-8502 (Japan); Orito, R. [Graduate School of Science and Technology, Department of Physics, Kobe University, 1-1 Rokkoudai, Nada, Kobe 657-8501 (Japan); Sekiya, H.; Takada, A. [Graduate School of Science, Department of Physics, Kyoto University Kitashirakawa, Sakyo, Kyoto 606-8502 (Japan); Takeda, A. [Kamioka Observatory, ICRR, University of Tokyo, 456 Higashi-mozumi, Hida-shi, Gifu 505-1205 (Japan); Tanimori, T.; Ueno, K. [Graduate School of Science, Department of Physics, Kyoto University Kitashirakawa, Sakyo, Kyoto 606-8502 (Japan)

    2007-10-21

    We report on the development of a large Compton camera with the full reconstruction of the Compton process based on a prototype. This camera consists of two kinds of detectors. One is a gaseous time projection chamber (micro-TPC) for measuring the energy and the track of a Compton recoil electron. The micro-TPC is based on a {mu}-PIC and a GEM, which are micro-pattern gas detectors (MPGDs). The size of the micro-TPC was 10cmx10cmx8cm in the case of the prototype, and we enlarged it to 23cmx28cmx15cm. The other detector part is a NaI (Tl) Anger camera for measuring the scattered gamma-ray. With these informations, we can completely reconstruct a Compton event, and determine the direction of the incident gamma-ray, event by event. We succeeded in reconstructing events of incident 662 keV gamma-rays. The measured angular resolutions of the 'angular resolution measure' (ARM) and the 'scatter plane deviation' (SPD) were 9.3{sup 0} and 158{sup 0} (FWHM), respectively.

  17. Electron lifetime measurement using cosmic ray muons at the MicroBooNE LArTPC

    Science.gov (United States)

    Meddage, Varuna Crishan; MicroBooNE Collaboration

    2017-01-01

    MicroBooNE, a 170 ton liquid argon time projection chamber (LArTPC) located on the Fermilab's Booster Neutrino Beamline (BNB), is designed to both probe neutrino physics phenomena and further develop the LArTPC detector technology. MicroBooNE is the largest currently operating LArTPC detector and began collecting data in Fall 2015. LArTPCs are imaging detectors that offer exceptional capabilities for studying neutrinos. A fundamental requirement for the performance of such detectors is to maintain electronegative contaminants such as oxygen and water at extremely low concentrations, which otherwise can absorb the ionization electrons. The impurity levels in liquid argon can be estimated from the drift electron lifetime as they are inversely proportional to each other. This talk presents a measurement of the drift electron lifetime using cosmic ray muon data collected by MicroBooNE. An interpretation of the observed drift electron lifetime as a function of time indicates that the electron attenuation due to impurities in the liquid argon is negligible during normal operations, implying that the argon purification and gas recirculation system in MicroBooNE is performing successfully.

  18. AGS silicon gold collisions measured in the E-810 TPC (Time Projection Chamber)

    Energy Technology Data Exchange (ETDEWEB)

    Bonner, B.E.; Buchanan, J.A.; Chiou, C.N.; Clement, J.M.; Corcoran, M.D.; Kruk, J.W.; Miettinen, H.E.; Mutchler, G.S.; Nessi, M.; Nessi-Tedaldi, F.; Roberts, J.B. (Rice Univ., Houston, TX (USA)); Chan, C.S.; Kramer, M.A. (City Coll., New York, NY (USA)); Etkin, A.; Foley, K.J.; Hackenburg, R.W.; Longacre, R.S.; Love, W.A.; Morris, T.W.; Platner, E.D.; Saulys, A.C. (Brookhaven National Lab., Upton, NY (USA)); Hallma

    1990-03-26

    The tracking detector of AGS Experiment 810 is a three-piece Time Projection Chamber (TPC) intended to measure all charged tracks in the forward hemisphere of the nucleon-nucleon center of mass system, i.e. forward of an angle of about 20 degrees in the lab. Each module of the TPC contains twelve rows of short anode wires which give 3-D space points on each track, but no dE/dx information useable for particle identification. The TPC was operated in a beam of silicon ions at the end of June 1989 and this talk reports the results of analysis of the data taken with a thin gold target in that run. We have gathered a similar amount of data from thin copper and silicon targets, the analysis of which is in a less advanced state. The results of our investigation of the neutral strange particle decays appear in a separate contribution by Al Saulys. This paper presents the current state of the analysis of the charged tracks from the silicon gold collisions. 1 ref., 15 figs.

  19. Review of recent results on heavy-ion physics and astroparticle physics in ALICE at the LHC

    CERN Document Server

    Bello, Héctor; Ortiz, Antonio

    2016-01-01

    In this work we present a summary of the most relevant results on heavy-ion and astroparticle physics in ALICE. The summary includes a brief overview of the current status on the characterization of the hot and dense QCD medium created in the heavy-ion collisions produced at the LHC, as well as the intriguing finding of collective-like phenomena in small collision systems.

  20. Conceptual design of an ALICE Tier-2 centre. Integrated into a multi-purpose computing facility

    Energy Technology Data Exchange (ETDEWEB)

    Zynovyev, Mykhaylo

    2012-06-29

    This thesis discusses the issues and challenges associated with the design and operation of a data analysis facility for a high-energy physics experiment at a multi-purpose computing centre. At the spotlight is a Tier-2 centre of the distributed computing model of the ALICE experiment at the Large Hadron Collider at CERN in Geneva, Switzerland. The design steps, examined in the thesis, include analysis and optimization of the I/O access patterns of the user workload, integration of the storage resources, and development of the techniques for effective system administration and operation of the facility in a shared computing environment. A number of I/O access performance issues on multiple levels of the I/O subsystem, introduced by utilization of hard disks for data storage, have been addressed by the means of exhaustive benchmarking and thorough analysis of the I/O of the user applications in the ALICE software framework. Defining the set of requirements to the storage system, describing the potential performance bottlenecks and single points of failure and examining possible ways to avoid them allows one to develop guidelines for selecting the way how to integrate the storage resources. The solution, how to preserve a specific software stack for the experiment in a shared environment, is presented along with its effects on the user workload performance. The proposal for a flexible model to deploy and operate the ALICE Tier-2 infrastructure and applications in a virtual environment through adoption of the cloud computing technology and the 'Infrastructure as Code' concept completes the thesis. Scientific software applications can be efficiently computed in a virtual environment, and there is an urgent need to adapt the infrastructure for effective usage of cloud resources.

  1. Light flavour hadron production in pp collisions at $\\sqrt{s}$ = 13 TeV with ALICE arXiv

    CERN Document Server

    Bustamante, Raúl Tonatiuh Jiménez

    The ALICE detector has excellent Particle IDentification (PID) capabilities in the central barrel ($\\lvert \\eta \\rvert <$ 0.9). This allows identified hadron production to be measured over a wide transverse momentum ($p_{\\rm{T}}$) range, using different sub-detectors and techniques: their specific energy loss (d$E$/d$x$), the velocity determination via time-of-flight measurement, the Cherenkov angle or their characteristic weak decay topology. Results on identified light flavour hadron production at mid-rapidity measured by ALICE in proton-proton collisions at $\\sqrt{s}$ = 13 TeV are presented and compared with previous measurements performed at lower energies. The results cover a wide range of particle species including long-lived hadrons, resonances and multi-strange baryons over the $p_{\\rm{T}}$ range from 150 MeV/$c$ up to 20 GeV/$c$, depending on the particle species.

  2. Alice Welford (1887-1918), a nurse in World War I: The impact of kindness and compassion.

    Science.gov (United States)

    Watkins, PeterJ; Watkins, Valerie J

    2017-02-01

    The contribution of nurses to the morale of wounded and dying young men during World War 1 was immense. Alice Welford came from the small North Yorkshire village of Crathorne, joined the Queen Alexandra Imperial Military Nursing Service in 1915 and spent the following two and one half years in nursing casualties from some of the fiercest battles of the war including Gallipoli and Salonika. She kept an autograph book inscribed by wounded and dying soldiers, with poignant verses and humorous drawings showing love, wit and tragedy. Despite the dreadful conditions, kindness and compassion brought them comfort and raised their morale - a critical message for today, and Alice's gift to us from World War I.

  3. A close-up of the ALEPH Time Projection Chamber (TPC) after the detector was dismantled, with a slice removed for the exhibition at the Musée International d'Horlogerie.

    CERN Multimedia

    2004-01-01

    On the occasion of CERN's 50th anniversary, starting 2 December at the Musée International d'Horlogerie in La Chaux-de-Fonds, Switzerland, a new exhibition will pay tribute to physics, from the cosmic to the subatomic scales. The exhibition, which run for several years, includes a slice of the Time Projection Chamber (TPC) from ALEPH, one of the LEP detectors, which CERN donated to the museum when the detector was dismantled.

  4. Final results of the tests on the resistive plate chambers for the ALICE muon arm

    Energy Technology Data Exchange (ETDEWEB)

    Arnaldi, R. [INFN, Sezione di Torino (Italy); Baldit, A.; Barret, V.; Bastid, N.; Blanc, A.; Blanchard, G. [LPC Clermont Ferrand, IN2P3/CNRS, Universite Blaise Pascal (France); Chiavassa, E. [INFN, Sezione di Torino (Italy); Dipartimento di Fisica Sperimentale dell' Universita di Torino (Italy); Cortese, P. [INFN, Sezione di Torino (Italy); Dipartimento di Scienze e Tecnologie, Avanzate dell' Universita del Piemonte Orientale (Italy); Crochet, P. [LPC Clermont Ferrand, IN2P3/CNRS, Universite Blaise Pascal (France); Dellacasa, G. [INFN, Sezione di Torino (Italy); Dipartimento di Scienze e Tecnologie, Avanzate dell' Universita del Piemonte Orientale (Italy); De Marco, N. [INFN, Sezione di Torino (Italy); Devaux, A.; Dupieux, P. [LPC Clermont Ferrand, IN2P3/CNRS, Universite Blaise Pascal (France); Ferretti, A.; Gallio, M. [INFN, Sezione di Torino (Italy); Dipartimento di Fisica Sperimentale dell' Universita di Torino (Italy); Gemme, R. [INFN, Sezione di Torino (Italy); Dipartimento di Scienze e Tecnologie, Avanzate dell' Universita del Piemonte Orientale (Italy); Grygorian, S.; Insa, C.; Jouve, F.; Lopez, X. [LPC Clermont Ferrand, IN2P3/CNRS, Universite Blaise Pascal (France)] (and others)

    2009-05-01

    The trigger for the ALICE muon spectrometer will be issued by single-gap, low resistivity bakelite resistive plate chambers (RPCs). The trigger system consists of four 5.5x6.5m{sup 2} RPC planes arranged in two stations, for a total of 72 detectors. One hundred and sixteen detectors have been assembled and tested in Torino. The tests have been performed with the streamer mixture developed for heavy ion data-taking. The tests include: the detection of gas leaks and parasitic currents; the measurement of the efficiency with cosmic rays, with particular regard to the uniformity of the efficiency throughout the whole active surface, with a granularity of about 2x2cm{sup 2}; the measurement of the dark current and of the mean and localised noise rate. All the RPCs produced have been characterised. Among them, the detectors to be finally installed in ALICE and some spare have been selected; 17% of all the produced detectors have been discarded. A short description of the test set-up is given. The results of the tests are presented, with particular regard to the performance of the selected detectors.

  5. Integration of XRootD into the cloud infrastructure for ALICE data analysis

    CERN Document Server

    Kompaniets, Mikhail; Svirin, Pavlo; Yurchenko, Volodymyr; Zarochentsev, Andrey

    2015-01-01

    Cloud technologies allow easy load balancing between different tasks and projects. From the viewpoint of the data analysis in the ALICE experiment, cloud allows to deploy software using Cern Virtual Machine (CernVM) and CernVM File System (CVMFS), to run different (including outdated) versions of software for long term data preservation and to dynamically allocate resources for different computing activities, e.g. grid site, ALICE Analysis Facility (AAF) and possible usage for local projects or other LHC experiments.We present a cloud solution for Tier-3 sites based on OpenStack and Ceph distributed storage with an integrated XRootD based storage element (SE). One of the key features of the solution is based on idea that Ceph has been used as a backend for Cinder Block Storage service for OpenStack, and in the same time as a storage backend for XRootD, with redundancy and availability of data preserved by Ceph settings. For faster and easier OpenStack deployment was applied the Packstack solution, which is ba...

  6. Test and Evaluation Station (TESt) - A Control System for the ALICE-HMPID Liquid Distribution Prototype

    CERN Document Server

    Maatta, E; CERN. Geneva; Swoboda, Detlef; Lecoeur, G

    1999-01-01

    The sub-detectors and systems in the ALICE experiment [1] are of various types. However, during physics runs, all devices necessary for the operation of the detector must be accessible and controllable through a common computer interface. Throughout all other periods each sub-detector requires maintenance, upgrading or test operation. To this end, an access independant of other sub-detectors must be guaranteed. These basic requirements impose a fair number of constraints on the architecture and components of the Detector Control System (DCS). The purpose of the TESt project consisted in the construction of a stand alone unit for a specific sub-system of an ALICE detector in order to gain first experience with commercial products for detector control. Although the control system includes only a small number of devices and is designed for a particular application, it covers nevertheless all layers of a complete system and can be extended or used in different applications. The control system prototype has been...

  7. Alignment of the ALICE Inner Tracking System with cosmic-ray tracks

    CERN Document Server

    Aamodt, K; Abeysekara, U; Abrahantes Quintana, A; Adamová, D; Aggarwal, M M; Aglieri Rinella, G; Agocs, A G; Aguilar Salazar, S; Ahammed, Z; Ahmad, A; Ahmad, N; Ahn, S U; Akimoto, R; Akindinov, A; Aleksandrov, D; Alessandro, B; Alfaro Molina, R; Alici, A; Almaráz Aviña, E; Alme, J; Altini, V; Altinpinar, S; Alt, T; Andrei, C; Andronic, A; Anelli, G; Angelov, V; Anson, C; Anticic, T; Antinori, F; Antinori, S; Antipin, K; Antonczyk, D; Antonioli, P; Anzo, A; Aphecetche, L; Appelshäuser, H; Arcelli, S; Arceo, R; Arend, A; Armesto, N; Arnaldi, R; Aronsson, T; Arsene, I C; Asryan, A; Augustinus, A; Averbeck, R; Awes, T C; Äystö, J; Azmi, M D; Bablok, S; Bach, M; Badalà, A; Baek, Y W; Bagnasco, S; Bailhache, R; Bala, R; Baldisseri, A; Baldit, A; Bán, J; Barbera, R; Barile, F; Barnaföldi, G G; Barnby, L; Barret, V; Bartke, J; Basile, M; Basmanov, V; Bastid, N; Bathen, B; Batigne, G; Batyunya, B; Baumann, C; Bearden, I G; Becker, B; Belikov, I; Bellwied, R; Belmont-Moreno, E; Belogianni, A; Benhabib, L; Beolé, S; Berceanu, I; Bercuci, A; Berdermann, E; Berdnikov, Y; Betev, L; Bhasin, A; Bhati, A K; Bianchi, L; Bianchin, C; Bianchi, N; Bielcík, J; Bielcíková, J; Bilandzic, A; Bimbot, L; Biolcati, E; Blanc, A; Blanco, F; Blanco, F; Blau, D; Blume, C; Boccioli, M; Bock, N; Bogdanov, A; Bøggild, H; Bogolyubsky, M; Bohm, J; Boldizsár, L; Bombara, M; Bombonati, C; Bondila, M; Borel, H; Borshchov, V; Bortolin, C; Bose, S; Bosisio, L; Bossú, F; Botje, M; Böttger, S; Bourdaud, G; Boyer, B; Braun, M; Braun-Munzinger, P; Bravina, L; Bregant, M; Breitner, T; Bruckner, G; Bruna, E; Bruno, G E; Brun, R; Budnikov, D; Buesching, H; Bugaev, K; Buncic, P; Busch, O; Buthelezi, Z; Caffarri, D; Caines, H; Cai, X; Camacho, E; Camerini, P; Campbell, M; Canoa Roman, V; Capitani, G P; Cara Romeo, G; Carena, F; Carena, W; Carminati, F; Casanova Díaz, A; Caselle, M; Castillo Castellanos, J; Castillo Hernandez, J F; Catanescu, V; Cattaruzza, E; Cavicchioli, C; Cerello, P; Chambert, V; Chang, B; Chapeland, S; Charpy, A; Charvet, J L; Chattopadhyay, S; Chattopadhyay, S; Cherney, M; Cheshkov, C; Cheynis, B; Chiavassa, E; Chibante Barroso, V; Chinellato, D D; Chochula, P; Choi, K; Chojnacki, M; Christakoglou, P; Christensen, C H; Christiansen, P; Chujo, T; Chuman, F; Cicalo, C; Cifarelli, L; Cindolo, F; Cleymans, J; Cobanoglu, O; Coffin, J P; Coli, S; Colla, A; Conesa Balbastre, G; Conesa del Valle, Z; Conner, E S; Constantin, P; Contin, G; Contreras, J G; Cormier, T M; Corrales Morales, Y; Cortese, P; Cortés Maldonado, I; Cosentino, M R; Costa, F; Cotallo, M E; Crescio, E; Crochet, P; Cuautle, E; Cunqueiro, L; Cussonneau, J; Dainese, A; Dalsgaard, H H; Danu, A; Dash, A; Dash, S; Das, I; Das, S; de Barros, G O V; De Caro, A; de Cataldo, G; de Cuveland, J; De Falco, A; De Gaspari, M; de Groot, J; De Gruttola, D; de Haas, A P; De Marco, N; De Pasquale, S; De Remigis, R; de Rooij, R; de Vaux, G; Delagrange, H; Dellacasa, G; Deloff, A; Demanov, V; Dénes, E; Deppman, A; D'Erasmo, G; Derkach, D; Devaux, A; Di Bari, D; Di Giglio, C; Di Liberto, S; Di Mauro, A; Di Nezza, P; Dialinas, M; Díaz, L; Díaz, R; Dietel, T; Ding, H; Divià, R; Djuvsland, Ø; do Amaral Valdiviesso, G; Dobretsov, V; Dobrin, A; Dobrowolski, T; Dönigus, B; Domínguez, I; Don, D M M; Dordic, O; Dubey, A K; Dubuisson, J; Ducroux, L; Dupieux, P; Dutta Majumdar, A K; Dutta Majumdar, M R; Elia, D; Emschermann, D; Enokizono, A; Espagnon, B; Estienne, M; Evans, D; Evrard, S; Eyyubova, G; Fabjan, C W; Fabris, D; Faivre, J; Falchieri, D; Fantoni, A; Fasel, M; Fearick, R; Fedunov, A; Fehlker, D; Fekete, V; Felea, D; Fenton-Olsen, B; Feofilov, G; Fernández Téllez, A; Ferreiro, E G; Ferretti, A; Ferretti, R; Figueredo, M A S; Filchagin, S; Fini, R; Fionda, F M; Fiore, E M; Floris, M; Fodor, Z; Foertsch, S; Foka, P; Fokin, S; Formenti, F; Fragiacomo, E; Fragkiadakis, M; Frankenfeld, U; Frolov, A; Fuchs, U; Furano, F; Furget, C; Fusco Girard, M; Gaardhøje, J J; Gadrat, S; Gagliardi, M; Gago, A; Gallio, M; Ganoti, P; Ganti, M S; Garabatos, C; García Trapaga, C; Gebelein, J; Gemme, R; Germain, M; Gheata, A; Gheata, M; Ghidini, B; Ghosh, P; Giraudo, G; Giubellino, P; Gladysz-Dziadus, E; Glasow, R; Glässel, P; Glenn, A; Gomez, R; González Santos, H; González-Trueba, L H; González-Zamora, P; Gorbunov, S; Gorbunov, Y; Gotovac, S; Gottschlag, H; Grabski, V; Grajcarek, R; Grelli, A; Grigoras, A; Grigoras, C; Grigoriev, V; Grigoryan, A; Grinyov, B; Grion, N; Gros, P; Grosse-Oetringhaus, J F; Grossiord, J Y; Grosso, R; Guarnaccia, C; Guber, F; Guernane, R; Guerzoni, B; Gulbrandsen, K; Gulkanyan, H; Gunji, T; Gupta, A; Gupta, R; Gustafsson, H A; Gutbrod, H; Haaland, Ø; Hadjidakis, C; Haiduc, M; Hamagaki, H; Hamar, G; Hamblen, J; Han, B H; Harris, J W; Hartig, M; Harutyunyan, A; Hasch, D; Hasegan, D; Hatzifotiadou, D; Hayrapetyan, A; Heide, M; Heinz, M; Helstrup, H; Herghelegiu, A; Hernández, C; Herrera Corral, G; Herrmann, N; Hetland, K F; Hicks, B; Hiei, A; Hille, P T; Hippolyte, B; Horaguchi, T; Hori, Y; Hristov, P; Hrivnácová, I; Huber, S; Humanic, T J; Hu, S; Hutter, D; Hwang, D S; Ichou, R; Ilkaev, R; Ilkiv, I; Innocenti, P G; Ippolitov, M; Irfan, M; Ivan, C; Ivanov, A; Ivanov, M; Ivanov, V; Iwasaki, T; Jachokowski, A; Jacobs, P; Jancurová, L; Jangal, S; Janik, R; Jayananda, K; Jena, C; Jena, S; Jirden, L; Jones, G T; Jones, P G; Jovanovic, P; Jung, H; Jung, W; Jusko, A; Kaidalov, A B; Kalcher, S; Kalinák, P; Kalliokoski, T; Kalweit, A; Kamal, A; Kamermans, R; Kanaki, K; Kang, E; Kang, J H; Kapitan, J; Kaplin, V; Kapusta, S; Karavicheva, T; Karpechev, E; Kazantsev, A; Kebschull, U; Keidel, R; Khan, M M; Khan, S A; Khanzadeev, A; Kharlov, Y; Kikola, D; Kileng, B; Kim, D J; Kim, D S; Kim, D W; Kim, H N; Kim, J H; Kim, J; Kim, J S; Kim, M; Kim, M; Kim, S H; Kim, S; Kim, Y; Kirsch, S; Kiselev, S; Kisel, I; Kisiel, A; Klay, J L; Klein-Bösing, C; Klein, J; Kliemant, M; Klovning, A; Kluge, A; Kniege, S; Koch, K; Kolevatov, R; Kolojvari, A; Kondratiev, V; Kondratyeva, N; Konevskih, A; Kornas, E; Kour, R; Kowalski, M; Kox, S; Kozlov, K; Králik, I; Kral, J; Kramer, F; Kraus, I; Kravcáková, A; Krawutschke, T; Krivda, M; Krumbhorn, D; Krus, M; Kryshen, E; Krzewicki, M; Kucheriaev, Y; Kuhn, C; Kuijer, P G; Kumar, L; Kumar, N; Kupczak, R; Kurashvili, P; Kurepin, A; Kurepin, A N; Kuryakin, A; Kushpil, S; Kushpil, V; Kutouski, M; Kvaerno, H; Kweon, M J; Kwon, Y; Lackner, F; Ladrón de Guevara, P; Lafage, V; Lal, C; Lara, C; La Rocca, P; Larsen, D T; Laurenti, G; Lazzeroni, C; Le Bornec, Y; Le Bris, N; Lee, H; Lee, K S; Lee, S C; Lefèvre, F; Lehnert, J; Leistam, L; Lenhardt, M; Lenti, V; León, H; León Monzón, I; León Vargas, H; Lévai, P; Lietava, R; Lindal, S; Lindenstruth, V; Lippmann, C; Lisa, M A; Listratenko, O; Liu, L; Li, Y; Loginov, V; Lohn, S; López Noriega, M; López-Ramírez, R; López Torres, E; Lopez, X; Løvhøiden, G; Lozea Feijo Soares, A; Lunardon, M; Luparello, G; Luquin, L; Lu, S; Lutz, J R; Luvisetto, M; Madagodahettige-Don, D M; Maevskaya, A; Mager, M; Mahajan, A; Mahapatra, D P; Maire, A; Makhlyueva, I; Ma, K; Malaev, M; Maldonado Cervantes, I; Malek, M; Mal'Kevich, D; Malkiewicz, T; Malzacher, P; Mamonov, A; Manceau, L; Mangotra, L; Manko, V; Manso, F; Manzari, V; Mao, Y; Mares, J; Margagliotti, G V; Margotti, A; Marín, A; Martashvili, I; Martinengo, P; Martínez Davalos, A; Martínez García, G; Martínez, M I; Maruyama, Y; Ma, R; Marzari Chiesa, A; Masciocchi, S; Masera, M; Masetti, M; Masoni, A; Massacrier, L; Mastromarco, M; Mastroserio, A; Matthews, Z L; Mattos Tavares, B; Matyja, A; Mayani, D; Mazza, G; Mazzoni, M A; Meddi, F; Menchaca-Rocha, A; Mendez Lorenzo, P; Meoni, M; Mercado Pérez, J; Mereu, P; Miake, Y; Michalon, A; Miftakhov, N; Milosevic, J; Minafra, F; Mischke, A; Miskowiec, D; Mitu, C; Mizoguchi, K; Mlynarz, J; Mohanty, B; Molnar, L; Mondal, M M; Montaño Zetina, L; Monteno, M; Montes, E; Morando, M; Moretto, S; Morsch, A; Moukhanova, T; Muccifora, V; Mudnic, E; Muhuri, S; Müller, H; Munhoz, M G; Munoz, J; Musa, L; Musso, A; Nandi, B K; Nania, R; Nappi, E; Navach, F; Navin, S; Nayak, T K; Nazarenko, S; Nazarov, G; Nedosekin, A; Nendaz, F; Newby, J; Nianine, A; Nicassio, M; Nielsen, B S; Nikolaev, S; Nikolic, V; Nikulin, S; Nikulin, V; Nilsen, B S; Nilsson, M S; Noferini, F; Nomokonov, P; Nooren, G; Novitzky, N; Nyatha, A; Nygaard, C; Nyiri, A; Nystrand, J; Ochirov, A; Odyniec, G; Oeschler, H; Oinonen, M; Okada, K; Okada, Y; Oldenburg, M; Oleniacz, J; Oppedisano, C; Orsini, F; Ortíz Velázquez, A; Ortona, G; Oskamp, C; Oskarsson, A; Osmic, F; Österman, L; Ostrowski, P; Otterlund, I; Otwinowski, J; Øvrebekk, G; Oyama, K; Ozawa, K; Pachmayer, Y; Pachr, M; Padilla, F; Pagano, P; Paic, G; Painke, F; Pajares, C; Palaha, A; Palmeri, A; Pal, S K; Pal, S; Panse, R; Pappalardo, G S; Park, W J; Pastircák, B; Pastore, C; Paticchio, V; Pavlinov, A; Pawlak, T; Peitzmann, T; Pepato, A; Pereira, H; Peressounko, D; Pérez, C; Perini, D; Perrino, D; Peryt, W; Peschek, J; Pesci, A; Peskov, V; Pestov, Y; Peters, A J; Petrácek, V; Petridis, A; Petris, M; Petrovici, M; Petrov, P; Petta, C; Peyré, J; Piano, S; Piccotti, A; Pikna, M; Pillot, P; Pinsky, L; Pitz, N; Piuz, F; Platt, R; Pluta, J; Pocheptsov, T; Pochybova, S; Podesta Lerma, P L M; Poggio, F; Poghosyan, M G; Poghosyan, T; Polák, K; Polichtchouk, B; Polozov, P; Polyakov, V; Pommeresch, B; Pop, A; Posa, F; Poskon, M; Pospisil, V; Potukuchi, B; Pouthas, J; Prasad, S K; Preghenella, R; Prino, F; Pruneau, C A; Pshenichnov, I; Puddu, G; Pujahari, P; Pulvirenti, A; Punin, A; Punin, V; Putis, M; Putschke, J; Quercigh, E; Rachevski, A; Rademakers, A; Radomski, S; Räihä, T S; Rak, J; Rakotozafindrabe, A; Ramello, L; Ramírez Reyes, A; Rammler, M; Raniwala, R; Raniwala, S; Räsänen, S; Rashevskaya, I; Rath, S; Read, K F; Real, J; Redlich, K; Renfordt, R; Reolon, A R; Reshetin, A; Rettig, F; Revol, J P; Reygers, K; Ricaud, H; Riccati, L; Ricci, R A; Richter, M; Riedler, P; Riegler, W; Riggi, F; Rivetti, A; Rodriguez Cahuantzi, M; Røed, K; Röhrich, D; Román López, S; Romita, R; Ronchetti, F; Rosinský, P; Rosnet, P; Rossegger, S; Rossi, A; Roukoutakis, F; Rousseau, S; Roy, C; Roy, P; Rubio-Montero, A J; Rui, R; Rusanov, I; Russo, G; Ryabinkin, E; Rybicki, A; Sadovsky, S; Safarík, K; Sahoo, R; Saini, J; Saiz, P; Sakata, D; Salgado, C A; Salgueiro Dominques da Silva, R; Salur, S; Samanta, T; Sambyal, S; Samsonov, V; Sándor, L; Sandoval, A; Sano, M; Sano, S; Santo, R; Santoro, R; Sarkamo, J; Saturnini, P; Scapparone, E; Scarlassara, F; Scharenberg, R P; Schiaua, C; Schicker, R; Schindler, H; Schmidt, C; Schmidt, H R; Schossmaier, K; Schreiner, S; Schuchmann, S; Schukraft, J; Schutz, Y; Schwarz, K; Schweda, K; Scioli, G; Scomparin, E; Segato, G; Semenov, D; Senyukov, S; Seo, J; Serci, S; Serkin, L; Serradilla, E; Sevcenco, A; Sgura, I; Shabratova, G; Shahoyan, R; Sharkov, G; Sharma, N; Sharma, S; Shigaki, K; Shimomura, M; Shtejer, K; Sibiriak, Y; Siciliano, M; Sicking, E; Siddi, E; Siemiarczuk, T; Silenzi, A; Silvermyr, D; Simili, E; Simonetti, G; Singaraju, R; Singhal, V; Singh, R; Sinha, B C; Sinha, T; Sitar, B; Sitta, M; Skaali, T B; Skjerdal, K; Smakal, R; Smirnov, N; Snellings, R; Snow, H; Søgaard, C; Sokolov, O; Soloviev, A; Soltveit, H K; Soltz, R; Sommer, W; Son, C W; Song, M; Son, H S; Soos, C; Soramel, F; Soyk, D; Spyropoulou-Stassinaki, M; Srivastava, B K; Stachel, J; Staley, F; Stan, I; Stefanek, G; Stefanini, G; Steinbeck, T; Stenlund, E; Steyn, G; Stocco, D; Stock, R; Stolpovsky, P; Strmen, P; Suaide, A A P; Subieta Vásquez, M A; Sugitate, T; Suire, C; Sumbera, M; Susa, T; Swoboda, D; Symons, J; Szanto de Toledo, A; Szarka, I; Szostak, A; Szuba, M; Tadel, M; Tagridis, C; Takahara, A; Takahashi, J; Tanabe, R; Tapia Takaki, J D; Taureg, H; Tauro, A; Tavlet, M; Tejeda Muñoz, G; Telesca, A; Terrevoli, C; Thäder, J; Tieulent, R; Tlusty, D; Toia, A; Tolyhy, T; Torcato de Matos, C; Torii, H; Torralba, G; Toscano, L; Tosello, F; Tournaire, A; Traczyk, T; Tribedy, P; Tröger, G; Truesdale, D; Trzaska, W H; Tsiledakis, G; Tsilis, E; Tsuji, T; Tumkin, A; Turrisi, R; Turvey, A; Tveter, T S; Tydesjö, H; Tywoniuk, K; Ulery, J; Ullaland, K; Uras, A; Urbán, J; Urciuoli, G M; Usai, G L; Vacchi, A; Vala, M; Valencia Palomo, L; Vallero, S; van den Brink, A; van der Kolk, N; Vande Vyvre, P; van Leeuwen, M; Vannucci, L; Vargas, A; Varma, R; Vasiliev, A; Vassiliev, I; Vassiliou, M; Vechernin, V; Venaruzzo, M; Vercellin, E; Vergara, S; Vernet, R; Verweij, M; Vetlitskiy, I; Vickovic, L; Viesti, G; Vikhlyantsev, O; Vilakazi, Z; Villalobos Baillie, O; Vinogradov, A; Vinogradov, L; Vinogradov, Y; Virgili, T; Viyogi, Y P; Vodopianov, A; Voloshin, K; Voloshin, S; Volpe, G; von Haller, B; Vranic, D; Vrláková, J; Vulpescu, B; Wagner, B; Wagner, V; Wallet, L; Wan, R; Wang, D; Wang, Y; Watanabe, K; Wen, Q; Wessels, J; Wiechula, J; Wikne, J; Wilk, A; Wilk, G; Williams, M C S; Willis, N; Windelband, B; Xu, C; Yang, C; Yang, H; Yasnopolsky, A; Yermia, F; Yi, J; Yin, Z; Yokoyama, H; Yoo, I-K; Yuan, X; Yushmanov, I; Zabrodin, E; Zagreev, B; Zalite, A; Zampolli, C; Zanevsky, Yu; Zaporozhets, Y; Zarochentsev, A; Závada, P; Zbroszczyk, H; Zelnicek, P; Zenin, A; Zepeda, A; Zgura, I; Zhalov, M; Zhang, X; Zhou, D; Zhou, S; Zhu, J; Zichichi, A; Zinchenko, A; Zinovjev, G; Zinovjev, M; Zoccarato, Y; Zychácek, V

    2010-01-01

    ALICE (A Large Ion Collider Experiment) is the LHC (Large Hadron Collider) experiment devoted to investigating the strongly interacting matter created in nucleus-nucleus collisions at the LHC energies. The ALICE ITS, Inner Tracking System, consists of six cylindrical layers of silicon detectors with three different technologies; in the outward direction: two layers of pixel detectors, two layers each of drift, and strip detectors. The number of parameters to be determined in the spatial alignment of the 2198 sensor modules of the ITS is about 13,000. The target alignment precision is well below 10 micron in some cases (pixels). The sources of alignment information include survey measurements, and the reconstructed tracks from cosmic rays and from proton-proton collisions. The main track-based alignment method uses the Millepede global approach. An iterative local method was developed and used as well. We present the results obtained for the ITS alignment using about 10^5 charged tracks from cosmic rays that h...

  8. Members of the ALICE collaboration greet the arrival of the experiment's first 500 lead tungstate crystals

    CERN Multimedia

    Maximilien Brice

    2002-01-01

    L. to r: Vladislav Manko (Kurchatov Institute, Moscow, PHOS project leader), Arne Klovning (University of Bergen, PHOS technical coordinator), Vyacheslav Demanov (VNIIEF, Sarov), Bjorn Pommeresche (University of Bergen), Hans de Groot (CERN, ALICE resource coordinator), Dimitri Alexandrov (Kurchatov Institute, Moscow), Mikhail Ippolitov (Kurchatov Institute, Moscow), Yuri Vinogradov (VNIIEF, Sarov), Chris Fabjan (CERN, ALICE technical coordinator), Yuri Sibiriak (Kurchatov Institute, Moscow), Sergei Sadovsky (IHEP, Protvino), Jurgen Schukraft (CERN, ALICE spokesperson).

  9. Measurements of heavy-flavour decay leptons with ALICE

    Directory of Open Access Journals (Sweden)

    Sakai Shingo

    2015-01-01

    Full Text Available We present measurements of electrons and muons from heavy-flavour hadron decays at central and forward rapidity performed by the ALICE Collaboration in p–Pb (√sNN = 5.02 TeV and Pb–Pb collisions (√sNN = 2.76 TeV. Electrons are reconstructed using several detectors of the ALICE central barrel. Muons are reconstructed using the muon spectrometer at forward rapidity (2.5 < y < 4. The nuclear modification factors in Pb–Pb (RAA and in p–Pb (RpPb collisions, and the azimuthal anisotropy (v2 in Pb– Pb collisions will be discussed. Theoretical predictions are compared with the data. In addition, the measurement of the azimuthal correlation between electrons from heavyflavour hadron decays and charged hadrons in p–Pb collisions will be shown.

  10. Experience report: System management at the ALICE HLT cluster

    Energy Technology Data Exchange (ETDEWEB)

    Lara, Camilo; Vennedey, Falco; Ulrich, Jochen; Boettger, Stefan; Breitner, Timo; Kebschull, Udo [Infrastruktur und Rechnersysteme in der Informationsverarbeitung (IRI), Institut fuer Informatik, Goethe-Universitaet Frankfurt am Main (Germany); Collaboration: ALICE-Collaboration

    2013-07-01

    The ALICE HLT cluster is responsible for the first analysis and compression of the data from the ALICE experiment at CERN. The processing is performed using hardware accelerators like FPGAs, GPUs and computer nodes with commodity hardware. The mixture of hardware accelerators and several types of nodes causes an increased configuration and system management effort. To handle this effort, we are using a combination of three tools: Chef for the configuration management, Ganglia for the real time monitoring and SysMES for unattended system management, i.e. automatic problem recognition and solution. The tools help to minimize the manpower needed to administrate the cluster by reducing the time needed to recognize and identify problems or even by solving problems automatically. In this talk, we give an insight into our setup and report on the experience we have gained with the heterogeneous, on-line processing cluster during the last four years.

  11. A security architecture for the ALICE grid services

    CERN Document Server

    Schreiner, Steffen; Buchmann, Johannes; Betev, Latchezar; Grigoras, Alina

    2012-01-01

    Globally distributed research cyberinfrastructures, like the ALICE Grid Services, need to provide traceability and accountability of operations and internal interactions. This document presents a new security architecture for the ALICE Grid Services, allowing to establish non-repudiation with respect to creatorship and ownership of Grid files and jobs. It is based on mutually authenticated and encrypted communication using X.509 Public Key Infrastructure and the Transport Layer Security (TLS) protocol. Introducing certified Grid file entries and signed Grid jobs by implementing a model of Mediated Definite Delegation it allows to establish long-term accountability concerning Grid jobs and files. Initial submissions as well as any alteration of Grid jobs are becoming verifiable and can be traced back to the originator. The architecture has been implemented as a prototype along with the development of a new central Grid middleware, called jAliEn.

  12. AliEn - ALICE environment on the GRID

    CERN Document Server

    Saiz, P; Buncic, P; Piskac, R; Revsbech, J E; Sego, V

    2003-01-01

    AliEn (http://alien.cern.ch) (ALICE Environment) is a Grid framework built on top of the latest Internet standards for information exchange and authentication (SOAP, PKI) and common Open Source components. AliEn provides a virtual file catalogue that allows transparent access to distributed datasets and a number of collaborating Web services which implement the authentication, job execution, file transport, performance monitor and event logging. In the paper we will present the architecture and components of the system.

  13. AliEn - ALICE environment on the GRID

    Energy Technology Data Exchange (ETDEWEB)

    Saiz, P. E-mail: pablo.saiz@cern.ch; Aphecetche, L.; Buncic, P.; Piskac, R.; Revsbech, J.-E.; Sego, V

    2003-04-21

    AliEn (http://alien.cern.ch) (ALICE Environment) is a Grid framework built on top of the latest Internet standards for information exchange and authentication (SOAP, PKI) and common Open Source components. AliEn provides a virtual file catalogue that allows transparent access to distributed datasets and a number of collaborating Web services which implement the authentication, job execution, file transport, performance monitor and event logging. In the paper we will present the architecture and components of the system.

  14. Descent of the Silicon Pixel Detector (SPD) for ALICE Experiment

    CERN Multimedia

    2007-01-01

    The Silicon Pixel Detector (SPD) constitutes the two innermost layers of the ALICE Inner Tracking System (ITS) at radii of 3.9 cm and 7.6 cm, respectively. It is a fundamental element for the determination of the position of the primary vertex as well as for the measurement of the impact parameter of secondary tracks originating from the weak decays of strange, charm and beauty particles.

  15. Production of ALICE microstrip detectors at ITC-irst

    Energy Technology Data Exchange (ETDEWEB)

    Gregori, Paolo [ITC-irst, Via Sommarive 18, I-38050 Povo, Trento (Italy)]. E-mail: gregori@itc.it; Bellutti, Pierluigi [ITC-irst, Via Sommarive 18, I-38050 Povo, Trento (Italy); Boscardin, Maurizio [ITC-irst, Via Sommarive 18, I-38050 Povo, Trento (Italy); Collini, Amos [ITC-irst, Via Sommarive 18, I-38050 Povo, Trento (Italy); Dalla Betta, Gian-Franco [ITC-irst, Via Sommarive 18, I-38050 Povo, Trento (Italy); DIT, Universita di Trento, Via Sommarive 14, I-38050 Povo, Trento (Italy); Pucker, Georg [ITC-irst, Via Sommarive 18, I-38050 Povo, Trento (Italy); Zorzi, Nicola [ITC-irst, Via Sommarive 18, I-38050 Povo, Trento (Italy)

    2007-03-01

    We report on the results from the production of 600 double-sided silicon microstrip detectors for the ALICE experiment. We present the fabrication process and some selected results from the electrical characterization of detectors and test structures. The large amount of experimental data allowed a statistically relevant analysis to be performed. The main technological aspects related to production yield optimization will also be addressed.

  16. Charmonium production in pp collisions with ALICE at the LHC

    CERN Document Server

    Hugo, Pereira Da Costa

    2016-01-01

    We report on forward-rapidity charmonium production in pp collisions at a center of mass energy $\\sqrt{s} = 13$ TeV, as measured by ALICE at the LHC. Differential cross sections for both J/{\\psi} and {\\psi}(2S) are presented as a function of the charmonium transverse momentum and rapidity. Results are compared to similar measurements performed by LHCb, to lower energy measurements and to state of the art model calculations.

  17. Permanent exhibition of the ALICE experiment at Point 2 : collisions

    CERN Multimedia

    2004-01-01

    Mini Big Bangs in ALICE Why? To study the nature of primordial matter, the quark–gluon plasma, and to discover how matter, as we know it today, was created. Where? 50 m underground in the path of the beams of the Large Hadron Collider (LHC). How? by colliding atomic nuclei at a speed close to that of light (300 000 km/s).

  18. Lead tungstate crystal of the ALICE Photon Spectrometer (PHOS)

    CERN Multimedia

    Patrice Loïez

    2002-01-01

    A consignment of 500 lead tungstate crystals arrived at CERN from the northern Russian town of Apatity in May. Destined for the ALICE heavy-ion experiment in preparation for the Large Hadron Collider, each crystal is an 18 cm long rod with a 2.2 cm square section, and weighs some 750 g. A total of 17 000 crystals will make up the experiment's photon spectrometer.

  19. 20 January 2011 - Hessischer Minister für Bundesangelegenheiten und Bevollmächtigter des Landes beim Bund, Hessen, Germany M. Boddenberg signing the guest book with CERN Director-General R. Heuer and Head of International Relations F. Pauss; in the ALICE surafce exhibition and underground experimental area with P. Braun-Munzinger, V.Lindenstruth and Adviser R. Voss.

    CERN Multimedia

    Maximilien Brice

    2011-01-01

    Michael Boddenberg, Hessian Minister for Federal Affairs and Representative of Hessen in the Federal Government, visited CERN on 20 January. His tour included the ALICE experiment, the LHC tunnel, the CERN Computer Centre and CERN Control Centre.

  20. The C-RORC PCIe Card and its Application in the ALICE and ATLAS Experiments

    CERN Document Server

    Engel, H; Costa, F; Crone, G J; Eschweiler, D; Francis, D; Green, B; Joos, M; Kebschull, U; Kiss, T; Kugel, A; Panduro Vasquez, J G; Soos, C; Teixeira-Dias, P; Tremblet, L; Vande Vyvre, P; Vandelli, W; Vermeulen, J C; Werner, P; Wickens, F J

    2015-01-01

    The ALICE and ATLAS DAQ systems read out detector data via point-to-point serial links into custom hardware modules, the ALICE RORC and ATLAS ROBIN. To meet the increase in operational requirements both experiments are replacing their respective modules with a new common module, the C-RORC. This card, developed by ALICE, implements a PCIe Gen 2 x8 interface and interfaces to twelve optical links via three QSFP transceivers. This paper presents the design of the C-RORC, its performance and its application in the ALICE and ATLAS experiments.

  1. The C-RORC PCIe card and its application in the ALICE and ATLAS experiments

    CERN Document Server

    Borga, A; The ATLAS collaboration; Crone, G; Engel, H; Eschweiler, D; Francis, D; Green, B; Joos, M; Kebschull, U; Kiss, T; Kugel, A; Panduro Vazquez, W; Soos, C; Teixeira-Dias, P; Tremblet, L; Vande Vyvre, P; Vandelli, W; Vermeulen, J; Werner, P; Wickens, F

    2014-01-01

    The ALICE and ATLAS DAQ systems read out detector data via point-to-point serial links into custom hardware modules, the ALICE RORC and ATLAS ROBIN. To meet the increase in operational requirements both experiments are replacing their respective modules with a new common module, the C-RORC. This card, developed by ALICE, implements a PCIe Gen 2 x8 interface and supports twelve optical links via three QSFP transceivers. This paper presents the design of the C-RORC, its performance and its applications in the ALICE and ATLAS experiments.

  2. Silicon ion interactions measured in the E-810 TPC at the AGS

    Energy Technology Data Exchange (ETDEWEB)

    Love, W.A.; Eiseman, S.E.; Etkin, A.; Foley, K.J.; Hackenburg, R.W.; Longacre, R.S.; Morris, T.W.; Platner, E.D.; Saulys, A.C. (Brookhaven National Lab., Upton, NY (USA)); Bonner, B.E.; Buchanan, J.A.; Chiou, C.N.; Clement, J.M.; Corcoran, M.D.; Kruk, J.W.; Mutchler, G.S.; Nessi, M.; Nessi-Tedaldi, F.; Roberts, J.B. (Rice Univ., Houston, TX (USA)); Chan, C.S.; Kramer, M.A.; Zhao, K. (City Univ. of New York, NY (USA)); Hallman, T.J.; Madansky, L. (Johns Hopkins Univ., Baltimore, MD (USA)); Lindenbaum, S.J. (Brookhaven National Lab., Upton, NY (USA) City Univ. of New York, NY (USA)); E-810 Collaboration

    1991-04-01

    The tracking detector of AGS Experiment 810 is a three-piece Time Projection Chamber (TPC) which measures all charged tracks in the forward hemisphere of the nucleon-nucleon center of mass system, i.e. forward of 20 degrees in the lab. A cut at multiplicity 50 was used to select more central collisions, yielding 2291 events from the gold sample, 2170 from the copper. This corresponds to cross sections of 0.59 and 0.20 barns, respectively, defining the 'central' sample for the charged particle distributions presented here. (orig./HSI).

  3. Alice Munro's "Runaway" in the Mirror of Sigmund Freud

    Directory of Open Access Journals (Sweden)

    Raheleh Bahador

    2015-03-01

    Full Text Available Mirroring the complexities of the human psyche, literature has received new comprehension through a psychoanalytic lens.  Alice Munro's "Runaway" (2003 is character-based and has the psychological analysis potential but it had never received such kind of study. The objective of the present paper is to read Munro's "Runaway" in the mirror of Sigmund Freud to detect the psychological aspects of its fictional characters. The characters are driven by the Freudian mental agencies and undergo phases of psychic disorder.  In the present paper, Munro's short fiction has been discussed based on Sigmund Freud's theory of the Unconscious and its connection with the interpretation of dreams as well as the symbolization of three main characters based on tripartite agencies of the id, ego and superego. Clarifying the latent and manifest levels of characters and the world of dreams indicates the artistic creation of Alice Munro in handling complex characterization. The unconscious and its connection with the female character's dreams have been discussed. The unconscious of the female character is reflected in her dreams in result of repression and asocial drives and desires. Unconscious through dreams is the mirror of the repressed psyche of the female character. Scrutinizing the three main characters in terms of Freudian psychic trilogy, they prove to fit their psychological Freudian terms.  Keywords: Alice Munro, Runaway, Sigmund Freud, Unconscious, Psychology, Id and Ego, Superego

  4. Pattern recognition and PID procedure with the ALICE-HMPID

    CERN Document Server

    Volpe, Giacomo

    2014-01-01

    The ALICE apparatus is dedicated to the study of pp, p–Pb and Pb–Pb collisions provided by LHC. ALICE has unique particle identification (PID) capabilities among the LHC experiments exploiting different PID techniques, i.e., energy loss, time-of-flight measurements, Cherenkov and transition radiation detection, calorimetry and topological ID. The ALICE-HMPID is devoted to the identification of charged hadrons. It consists of seven identical RICH counters, with liquid C6F14 as Cherenkov radiator (n ≈1.299 at λ ph=175 nm). Photons and charged particles detection is performed by a proportional chamber, coupled with a pad segmented CsI coated photo-cathode. In pp and p–Pb events HMPID provides 3 sigmas separation for pions and kaons up to View the MathML sourcepT=3GeV/c and for protons up to View the MathML sourcepT=5GeV/c. PID is performed by means of photon emission angle measurement, a challenging task in the high multiplicity environment of the most central Pb–Pb collisions. A dedicated algorithm h...

  5. Ré-imaginer Alice au pays des merveilles

    Directory of Open Access Journals (Sweden)

    Florence Cheron

    2016-12-01

    Full Text Available Alice’s Adventures in Wonderland fait l’objet d’adaptations cinématographiques dès les débuts du cinéma. De nombreuses analyses soulèvent, et ce dès les années 1990, le lien tacite entre les films de Tim Burton et les aventures d’Alice. Que ce soient les personnages, les univers ou encore l’absurdité des situations, il semblait évident que le cinéaste en viendrait un jour à filmer sa vision des écrits de Lewis Carroll, comme l’aboutissement d’une idée qui serait en germe depuis toujours. Le réalisateur rendant hommage aux premières illustrations mais aussi aux différentes adaptations d’Alice au cinéma, effectue une synthèse visuelle et narrative de l’ensemble de ces œuvres comme si son Alice in Wonderland devait être une transposition-somme.

  6. The Fast Interaction Trigger Detector of ALICE at the LHC

    Science.gov (United States)

    Lambert, Keenan; Brown, Shanice; Powell, Calvin; Harton, Austin; Garcia-Solis, Edmundo; Alice-Fit Team

    2017-01-01

    CERN (European Center for Nuclear Research) is a global laboratory that studies proton and heavy ion collisions at the Large Hadron Collider (LHC). ALICE (A Large Ion Collider Experiment) is one of four large experiments at the LHC. ALICE is dedicated to the study of the transition of matter to Quark-Gluon Plasma in heavy ion collisions. The experiment is preparing for the LHC upgrade after the second long shutdown (LS2) in 2019-20. To this end, ALICE is undertaking a major initiative to extend its physics capabilities. Among these improvements is a new Fast Interaction Trigger (FIT). The FIT will be replacing the current T0 and V0 trigger detectors. The purpose of the FIT will be to determine multiplicity, centrality, and reaction plane. The FIT will also serve as the primary forward trigger, luminosity, and collision time detector. This presentation will discuss the FIT upgrade and the results from the performance of the FIT detectors in simulations and test beams that support the current design parameters. This material is based upon work supported by the National Science Foundation under grants NSF-PHY-1407051, NSF-PHY-1305280, NSF-PHY-1613118, and NSF-PHY-1625081.

  7. Successful beam tests for ALICE Transition Radiation Detector

    CERN Multimedia

    2002-01-01

    Another round of beam tests of prototypes for the Transition Radiation Detector (TRD) for ALICE has been completed and there are already some good results. Mass production of the components of the detector will start early next year.   Top view of the setup for the Transition Radiation Detector prototype tests at CERN.On the left, can be seen the full-scale TRD prototype together with four smaller versions. These are busy days for the TRD (Transition Radiation Detector) team of ALICE. Twenty people - mainly from Germany, but also from Russia and Japan - were working hard during the beam tests this autumn at CERN to assess the performance of their detector prototypes. Analysis of the data shows that the TRD can achieve the desired physics goal even for the highest conceivable multiplicities in lead-lead collisions at the LHC. In its final configuration in the ALICE experiment, the TRD will greatly help in identifying high-momentum electrons, which are 'needles in a haystack' that consists mostly of...

  8. Dr Phil Mjwara Director General, Department of Science and Technology (DST) Ministry of Science and Technology Republic of South Africa visit the Alice experiment introduce by Prof. Jurgen Schukraft, spokeperson for Alice.

    CERN Document Server

    Maximilien Brice

    2007-01-01

    Dr Phil Mjwara Director General, Department of Science and Technology (DST) Ministry of Science and Technology Republic of South Africa visit the Alice experiment introduce by Prof. Jurgen Schukraft, spokeperson for Alice.

  9. 17 September 2013 - Polish Members of Parliament visiting the Tunnel at Point 2 with Senior Engineer, Technology Department A. Siemko and visiting the ALICE cavern with ALICE Collaboration, B. Erazmus

    CERN Multimedia

    Anna Pantelia

    2013-01-01

    17 September 2013 - Polish Members of Parliament visiting the Tunnel at Point 2 with Senior Engineer, Technology Department A. Siemko and visiting the ALICE cavern with ALICE Collaboration, B. Erazmus

  10. The FIDIAS project: Development of a Micromegas TPC for the detection of low-energy heavy ions

    Science.gov (United States)

    Iguaz, Francisco José; Panebianco, Stefano; Axiotis, Michael; Druillole, Frédéric; Fanourakis, George; Geralis, Theodoros; Giomataris, Ioannis; Harissopulos, Sotirios; Lagoyannis, Anastasios; Papaevangelou, Thomas

    2014-01-01

    Time Projection Chambers are widely used since many years for tracking and identification of charged particles in high energy physics. We present here a new R&D project, called FIDIAS, meant to investigate the feasibility of a Micromegas TPC for low energy heavy ions detection. In this framework, a TPC prototype based on Micromegas bulk technique has been extensively tested with spontaneous fission source. A deep analysis of the experimental results has been realized leading to a full characterization of the prototype in terms of gain, energy resolution and track reconstruction as a function of three working gas: helium, neon and argon. The encouraging results have also been compared to simulations, showing the Micromegas TPC is a very well suited detector for the detection of heavy ions in nuclear reactions at low energy.

  11. NEXT: Searching for the neutrinoless double beta decay with a gas-xenon TPC

    Energy Technology Data Exchange (ETDEWEB)

    Novella, P, E-mail: pau.novella@ciemat.e [CIEMAT, Av. Complutense 22, 28040 Madrid (Spain)

    2010-01-01

    Although different techniques are used to search for the neutrinoless double beta decay, the common challenges for all the existing or planned experiments are to achieve a good energy resolution and large background rejection factors. The NEXT collaboration addresses these two challenges with a high-pressure gas-Xenon TPC. Natural Xenon consists of almost 9% of {sup 136}Xe, a {beta}{beta}{sup 0{nu}} candidate emitter, and can be easily enriched. When used as a calorimeter, {sup 136}Xe yields an excellent energy resolution. This fact, combined with the expected long life of the {beta}{beta}{sup 2{nu}} mode, accounts for negligible intrinsic backgrounds up to masses of 1 ton. Furthermore, external backgrounds can be rejected with high efficiency by means of the electron tracking capabilities of the TPC. A detector containing about 100 kg of enriched Xenon is expected to be installed at Canfranc Underground Laboratory (LSC) within the next 5 years, with the twofold aim of exploring the degenerated hierarchy of the neutrino mass and providing deep understanding of the experimental techniques which allow extrapolation to larger detectors.

  12. A TPC-like readout method for high precision muon-tracking using GEM-detectors

    Energy Technology Data Exchange (ETDEWEB)

    Flierl, Bernhard; Biebel, Otmar; Bortfeldt, Jonathan; Hertenberger, Ralf; Klitzner, Felix; Loesel, Philipp; Mueller, Ralph [Ludwig-Maximilians-Universitaet Muenchen (Germany); Zibell, Andre [Julius-Maximilians-Universitaet Wuerzburg (Germany)

    2016-07-01

    Gaseous electron multiplier (GEM) detectors are well suited for tracking of charged particles. Three dimensional tracking in a single layer can be achieved by application of a time-projection-chamber like readout mode (μTPC), if the drift time of the electrons is measured and the position dependence of the arrival time is used to calculate the inclination angle of the track. To optimize the tracking capabilities for ion tracks drift gas mixtures with low drift velocity have been investigated by measuring tracks of cosmic muons in a compact setup of four GEM-detectors of 100 x 100 x 6 mm{sup 3} active volume each and an angular acceptance of -25 to 25 . The setup consists of three detectors with two-dimensional strip readout layers of 0.4 mm pitch and one detector with a single strip readout layer of 0.25 mm pitch. All strips are readout by APV25 frontend boards and the amplification stage in the detectors consists of three GEM-foils. Tracks are reconstructed by the μTPC-method in one of the detectors and are then compared to the prediction from the other three detectors defined by the center of charge in every detector. We report our study of Argon and Helium based noble gas mixtures with carbon-dioxide as quencher.

  13. Gas Gain Measurements from a Negative Ion TPC X-ray Polarimeter

    CERN Document Server

    Prieskorn, Z; Kaaret, P E; Black, J K; Jahoda, K

    2011-01-01

    Gas-based time projection chambers (TPCs) have been shown to be highly sensitive X-ray polarimeters having excellent quantum efficiency while at the same time achieving large modulation factors. To observe polarization of the prompt X-ray emission of a Gamma-ray burst (GRB), a large area detector is needed. Diffusion of the electron cloud in a standard TPC could be prohibitive to measuring good modulation when the drift distance is large. Therefore, we propose using a negative ion TPC (NITPC) with Nitromethane (CH3NO2) as the electron capture agent. The diffusion of negative ions is reduced over that of electrons due to the thermal coupling of the negative ions to the surrounding gas. This allows for larger area detectors as the drift distance can be increased without degrading polarimeter modulation. Negative ions also travel ~200 times slower than electrons, allowing the readout electronics to operate slower, resulting in a reduction of instrument power. To optimize the NITPC design, we have measured gas ga...

  14. Kaspar Jancis kujundas "Alice'i" arvuti abil / Kaspar Jancis ; interv. Raimu Hanson

    Index Scriptorium Estoniae

    Jancis, Kaspar

    2004-01-01

    7. veebr. esietendub Vanemuises tantsulavastus "Alice imedemaal". Etendus põhineb briti kirjaniku L. Carrolli samanimelisel lasteraamatul, koreograaf M. Murdmaa, kunstnik K. Jancis ja muusika on kirjutanud ungari helilooja S. Kall̤s, Alice'i osa tantsib korealanna Hye Min Kim

  15. ALICE Data Acquisition: how to record (more than) a DVD every second

    CERN Multimedia

    Divia, R

    2013-01-01

    The ALICE experiment at CERN requires a system capable to record the equivalent of a DVD every second during several consecutive weeks. The ALICE Data Acquisition system amply supports this requirement while providing several indispensable run-time features for control, monitoring, configuration, alarms etc...

  16. "Alice imedemaal" reaalsust tõsiselt ei võta / Margit Tõnson

    Index Scriptorium Estoniae

    Tõnson, Margit, 1978-

    2004-01-01

    7. veebr. esietendus Vanemuises tantsulavastus "Alice imedemaal". Etendus põhineb briti kirjaniku L. Carrolli samanimelisel lasteraamatul, koreograaf M. Murdmaa, kunstnik K. Jancis ja muusika on kirjutanud ungari helilooja S. Kall̤s, Alice'i osa tantsib korealanna Hye Min Kim

  17. JPL stories: story on the story (series) Careering through JPL, presented by Alice M. Fairhurst

    Science.gov (United States)

    Hendrickson, S.

    2002-01-01

    Alice Fairhurst, co-author of Effective Teaching, Effective Learning, presented an enthusiastic overview of her tenure as a JPL career development and mentoring coordinator (1991-2001). Among other things, Alice is an expert in Keirseyian Temperament and Myers-Briggs typology.

  18. ALICE event displays in pp collisions at 7 TeV

    CERN Multimedia

    Kalweit, Alexander Philipp

    2015-01-01

    Events with low, medium and high multiplicities in pp collisions at 7 TeV, recorded at the LHC by ALICE in June 2010. The big cylinder is the Time Projection Chamber of ALICE, with a diameter of 5 m and a length of 5 m, the inner red-green-blue cylinders are the Inner Tracking System.

  19. Alice Kask : Maalid ja joonistused = Paintings and drawings / Anu Allas

    Index Scriptorium Estoniae

    Allas, Anu, 1977-

    2007-01-01

    Maalikunstnik Alice Kase loomingust, mis on pälvinud usalduse tänu oma suveräänsusele, süvenemisele ja tõsidusele. Tema tööde jõud seisneb teose ja füüsilise objekti lahutamatuses, iga nüanss maali pinnal sünnib kuju võtnud materjalist enesest. Tema maalid on väga avatud, kohati isegi ohtlikult avatud kõikvõimalikele tõlgendusviisidele, neis on tasakaalustatud segu ilust, täiuselubadusest, hirmutavusest ning kaosest

  20. Alice and Bob: Reconciling Formal Models and Implementation

    DEFF Research Database (Denmark)

    Almousa, Omar; Mödersheim, Sebastian Alexander; Viganò, Luca

    2015-01-01

    This paper defines the “ultimate” formal semantics for Alice and Bob notation, i.e., what actions the honest agents have to perform, in the presence of an arbitrary set of cryptographic operators and their algebraic theory. Despite its generality, this semantics is mathematically simpler than any...... previous attempt. For practical applicability, we introduce the language SPS and an automatic translation to robust real-world implementations and corresponding formal models, and we prove this translation correct with respect to the semantics....

  1. The tracking system of the ALICE dimuon spectrometer

    CERN Document Server

    Basciu, S; Atanassov, I; Cicalò, C; De Falco, A; Floris, M; La Delfa, L; Marras, D; Masoni, A; Puddu, G; Serci, S; Siddi, E; Tuven, M; Usai, G L; Boudjemline, M K; Carduner, H; Charrier, D; Cussonneau, J P; Dialinas, M; Finck, C; Fresneau, S; Lautridou, P; Luquin, Lionel; Pichot, P; Thers, D; Baldisseri, Alberto; Borel, H; Dumonteil, E; Gosset, J; Jourde, Didier; Lugol, J C; Orsini, F; Penichot, Y; Robert, J P; Staley, F; Comets, M P; Courtat, P; Diarra, C; Espagnon, B; Guez, D; Le Bornec, Y; MacCormick, M; Martin, J M; Rousseau, S; Sinha, T; Willis, N; Nikulin, V V

    2004-01-01

    The ALICE Muon Spectrometer is mainly dedicated to the measurement of the production of the J/ psi , and Y families through their decay into muon pairs, in Pb-Pb collisions. In this paper we give a description of the dimuon tracking system, mainly concentrating on the modular CSC chambers which occupy the last three stations. The R&D phase is now almost over and the production of the final modules started. A description of the main performances of the detectors based on test beam results on prototypes will be given. (8 refs).

  2. Measurements of quarkonia with the central detectors of ALICE

    Energy Technology Data Exchange (ETDEWEB)

    Sommer, Wolfgang

    2008-03-26

    The production of quarkonia, the bound state of an heavy quark with its anti-particle, has for a long time been seen as a key process to understand the properties of nuclear matter in a relativistic heavy-ion collision. This thesis presents studies on the production of quarkonia in heavy-ion collisions at the new Large Hadron collider (LHC). The focus is set on the decay of J/Psi and Upsilon-states into their di-electronic decay channel, measured within the central detectors of the ALICE detector. (orig.)

  3. Narrative Time in Alice Munro’s Short Stories

    Institute of Scientific and Technical Information of China (English)

    薛舒

    2013-01-01

    Alice Munro is a well-known contemporary Canadian writer. She departs from the traditional linear development but employs a seemingly random narrative line as a structural device in her story-telling. In the five short stories,“Material”,“Walk-er Brothers Cowboy”,“The Moons of Jupiter”,“Miles City, Montana”and“Something I’ve Been Meaning to Tell you”, Mun-ro manipulates the use of disconnected narrative time to deal with rites of passage. Free from the conventional time schemes, she expresses her vision in multiple themes and leaves the story open for readers.

  4. Development and Characterization of a Multi-APD Xenon Electroluminescence TPC

    CERN Document Server

    Lux, T; Ballester, O; Bordoni, S; Gil-Botella, I; Hamer, N; Illa, J; Mañas, G Jover; Martin-Mari, C; Palomares, C; Rico, J; Sanchez, F; Santorelli, R; Verdugo, A

    2014-01-01

    The performance of an electroluminescence (EL) time projection chamber (TPC) with a multi avalanche photodiode (APD) readout was studied in pure xenon at 3.8 bar. Intercalibration and reconstruction methods were developed and applied to the data yielding energy resolutions as good as 5.3$+-$0.1 % FWHM for 59.5 keV gammas from 241-Am. The result was verified with a Monte Carlo (MC) based on Geant4 and Penelope predicting 5.2 % FWHM for the used setup. Point resolutions of about 0.5 mm were obtained by a pitch of 15 mm between the APDs. The results show that a multi-APD readout is a competitive technology for EL detectors filled with pure xenon with possible applications as Compton Cameras.

  5. Probing the fourth neutrino existence by neutral current oscillometry in the spherical gaseous TPC

    CERN Document Server

    Vergados, J D; Novikov, Yu N

    2011-01-01

    It is shown that, if the "new neutrino" implied by the Reactor Neutrino Anomaly exists and is in fact characterized by the suggested relatively high mass squared difference and reasonably large mixing angle, it should clearly reveal itself in the oscillometry measurements. For a judicious neutrino source the "new oscillation length L14 is expected shorter than 3m. Thus the needed measurements can be implemented with a gaseous spherical TPC of modest dimensions with a very good energy and position resolution, detecting nuclear recoils following the coherent neutrino-nucleus elastic scattering. The best candidates for oscillometry, yielding both monochromatic neutrinos as well as antineutrinos, are discussed. A sensitivity in the mixing angle theta14, (sin(2\\theta14))^2=0.1 (99 %), can be reached after a few months of data handling.

  6. MIMAC : A micro-tpc matrix for directional detection of dark matter

    CERN Document Server

    Santos, D; Bosson, G; Bouly, J L; Bourrion, O; Fourel, Ch; Grignon, C; Guillaudin, O; Mayet, F; Richer, J P; Delbart, A; Ferrer, E; Giomataris, I; Iguaz, F J; Mols, J P; Golabek, C; Lebreton, L

    2011-01-01

    Directional detection of non-baryonic Dark Matter is a promising search strategy for discriminating WIMP events from background. However, this strategy requires both a precise measurement of the energy down to a few keV and 3D reconstruction of tracks down to a few mm. To achieve this goal, the MIMAC project has been developed. It is based on a gaseous micro-TPC matrix, filled with CF4 and CHF3. The first results on low energy nuclear recoils (H, F) obtained with a low mono-energetic neutron field are presented. The discovery potential of this search strategy is discussed and illustrated by a realistic case accessible to MIMAC.

  7. MIMAC: A micro-tpc matrix for directional detection of dark matter

    Energy Technology Data Exchange (ETDEWEB)

    Santos, D; Billard, J; Bosson, G; Bouly, J L; Bourrion, O; Fourel, Ch; Grignon, C; Guillaudin, O; Mayet, F; Richer, J P [LPSC, Universite Joseph Fourier Grenoble 1, CNRS/IN2P3, Institut Polytechnique de Grenoble (France); Delbart, A; Ferrer, E; Giomataris, I; Iguaz, F J; Mols, J P [IRFU,CEA Saclay, 91191 Gif-sur-Yvette cedex (France); Golabek, C; Lebreton, L, E-mail: Daniel.Santos@lpsc.in2p3.fr [LMDN, IRSN Cadarache, 13115 Saint-Paul-Lez-Durance (France)

    2011-08-10

    Directional detection of non-baryonic Dark Matter is a promising search strategy for discriminating WIMP events from background. However, this strategy requires both a precise measurement of the energy down to a few keV and 3D reconstruction of tracks down to a few mm. To achieve this goal, the MIMAC project has been developed. It is based on a gaseous micro-TPC matrix, filled with CF{sub 4} and CHF{sub 3}. The first results on low energy nuclear recoils ({sup 1}H and {sup 19}F) obtained with a low mono-energetic neutron field are presented. The discovery potential of this search strategy is discussed and illustrated by a realistic case accessible to MIMAC.

  8. MIMAC: A micro-tpc matrix project for directional detection of dark matter

    CERN Document Server

    Santos, D; Bosson, G; Bouly, J L; Bourrion, O; Fourel, Ch; Guillaudin, O; Mayet, F; Richer, J P; Delbart, A; Ferrer, E; Giomataris, I; Iguaz, F J; Mols, J P; Golabek, C; Lebreton, L

    2011-01-01

    Directional detection of non-baryonic DarkMatter is a promising search strategy for discriminating WIMP events from background ones. This strategy requires both a measurement of the recoil energy down to a few keV and 3D reconstruction of tracks down to a few mm. The MIMAC project, based on a micro-TPC matrix, filled with CF4 and CHF3 is being developed. The first results of a chamber prototype of this matrix, on low energy nuclear recoils (1H and 19F) obtained with mono-energetic neutron fields are presented. The discovery potential of this search strategy is illustrated by a realistic case accessible to MIMAC.

  9. MIMAC: MIcro-tpc MAtrix of Chambers for dark matter directional detection

    CERN Document Server

    Santos, D; Bouly, J L; Bourrion, O; Fourel, Ch; Guillaudin, O; Lamblin, J; Mayet, F; Muraz, J F; Richer, J P; Riffard, Q; Lebreton, L; Maire, D; Busto, J; Brunner, J; Fouchez, D

    2013-01-01

    Directional detection of non-baryonic Dark Matter is a promising search strategy for discriminating WIMP events from neutrons, the ultimate background for dark matter direct detection. This strategy requires both a precise measurement of the energy down to a few keV and 3D reconstruction of tracks down to a few mm. The MIMAC (MIcro-tpc MAtrix of Chambers) collaboration has developed in the last years an original prototype detector based on the direct coupling of large pixelized micromegas with a special developed fast self-triggered electronics showing the feasibility of a new generation of directional detectors. The first bi-chamber prototype has been installed at Modane, underground laboratory in June 2012. The first undergournd background events, the gain stability and calibration are shown. The first spectrum of nuclear recoils showing 3D tracks coming from the radon progeny is presented.

  10. MIMAC: A micro-tpc matrix for dark matter directional detection

    CERN Document Server

    Santos, D; Bosson, G; Bouly, J L; Bourrion, O; Fourel, C; Guillaudin, O; Lamblin, J; Muraz, J F; Mayet, F; Richer, J P; Riffard, Q; Ferrer, E; Giomataris, I; Iguaz, F J; Lebreton, L; Maire, D

    2013-01-01

    The dark matter directional detection opens a new field in cosmology bringing the possibility to build a map of nuclear recoils that would be able to explore the galactic dark matter halo giving access to a particle characterization of such matter and the shape of the halo. The MIMAC (MIcro-tpc MAtrix of Chambers) collaboration has developed in the last years an original prototype detector based on the direct coupling of large pixelized micromegas with a devoted fast self-triggered electronics showing the feasibility of a new generation of directional detectors. The discovery potential of this search strategy is discussed and illustrated. In June 2012, the first bi-chamber prototype has been installed at Modane Underground Laboratory (LSM) and the first underground background events, the gain stability and calibration are shown.

  11. MIMAC : A micro-tpc matrix for directional detection of dark matter

    CERN Document Server

    Santos, D; Bosson, G; Bourrion, O; Grignon, C; Guillaudin, O; Mayet, F; Richer, J P; Ferrer, E; Giomataris, I; Iguaz, F J; Mols, J P; Allaoua, A; Golabek, C; Lebreton, L

    2010-01-01

    Directional detection of non-baryonic Dark Matter is a promising search strategy for discriminating WIMP events from background. However, this strategy requires both a precise measurement of the energy down to a few keV and 3D reconstruction of tracks down to a few mm. To achieve this goal, the MIMAC project has been developed. It is based on a gaseous micro-TPC matrix, filled with 3He, CF4 and/or C4H10. The first results on low energy nuclear recoils (1H and 19F) obtained with a low mono-energetic neutron field are presented. The discovery potential of this search strategy is discussed and illustrated by a realistic case accessible to MIMAC.

  12. TPC-like readout for thermal neutron detection using a GEM-detector

    CERN Document Server

    Flierl, Bernhard; Hertenberger, Ralf; Zeitelhack, Karl

    2015-01-01

    Spatial resolution of less than 200 um is challenging for thermal neutron detection. A novel readout scheme based on the time-projection-chamber (TPC) concept is used in a gaseous electron multiplier (GEM) detector. Thermal neutrons are captured in a single 2 um thick Boron-10 converter cathode and secondary Helium and Lithium ions are produced with a combined energy of 2.8 MeV. These ions have sufficient energy to form straight tracks of several mm length. With a time resolving 2-dimensional readout of 400 um pitch in both directions, based on APV25 chips, the ions are tracked and their respective origin in the cathode converter foil is reconstructed. Using an Ar-CO2 93:7% gas mixture, a resolution of 100 um (FWHM 235 um) has been observed with a triple GEM-detector setup at the Garching neutron source (FRMII) for neutrons of 4.7 Angstrom.

  13. Directional detection of Dark Matter with the MIcro-tpc MAtrix of Chambers

    CERN Document Server

    Couturier, C; Naraghi, F; Riffard, Q; Santos, D; Sauzet, N; Colas, P; Ribas, E Ferrer; Giomataris, I; Busto, J; Fouchez, D; Tao, C; Zhou, N

    2016-01-01

    Particles weakly interacting with ordinary matter, with an associated mass of the order of an atomic nucleus (WIMPs), are plausible candidates for Dark Matter. The direct detection of an elastic collision of a target nuclei induced by one of these WIMPs has to be discriminated from the signal produced by the neutrons, which leaves the same signal in a detector. The MIMAC (MIcro-tpc MAtrix of Chambers) collaboration has developed an original prototype detector which combines a large pixelated Micromegas coupled with a fast, self-triggering, electronics. Aspects of the two-chamber module in operation in the Modane Underground Laboratory are presented: calibration, characterization of the $^{222}$Rn progeny. A new test bench combining a MIMAC chamber with the COMIMAC portable quenching line has been set up to characterize the 3D tracks of low energy ions in the MIMAC gas mixture: the preliminary results thereof are presented. Future steps are briefly discussed.

  14. MIMAC-He3 : MIcro-tpc MAtrix of Chambers of He3

    CERN Document Server

    Santos, D; Lamy, T; Mayet, F; Moulin, E

    2016-01-01

    The project of a micro-TPC matrix of chambers of He3 for direct detection of non-baryonic dark matter is outlined. The privileged properties of He3 are highlighted. The double detection (ionization - projection of tracks) will assure the electron-recoil discrimination. The complementarity of MIMAC-He3 for supersymmetric dark matter search with respect to other experiments is illustrated. The modular character of the detector allows to have different gases to get A-dependence. The pressure degreee of freedom gives the possibility to work at high and low pressure. The low pressure regime gives the possibility to get the directionality of the tracks. The first measurements of ionization at very few keVs for He3 in He4 gas are described.

  15. The $\\mu$TPC Method: Improving the Position Resolution of Neutron Detectors Based on MPGDs

    CERN Document Server

    Pfeiffer, Dorothea; Birch, Jens; Hall-Wilton, Richard; Höglund, Carina; Hultman, Lars; Iakovidis, George; Oliveri, Eraldo; Oksanen, Esko; Ropelewski, Leszek; Thuiner, Patrik

    2015-01-01

    Due to the Helium-3 crisis, alternatives to the standard neutron detection techniques are becoming urgent. In addition, the instruments of the European Spallation Source (ESS) require advances in the state of the art of neutron detection. The instruments need detectors with excellent neutron detection efficiency, high-rate capabilities and unprecedented spatial resolution. The Macromolecular Crystallography instrument (NMX) requires a position resolution in the order of 200 um over a wide angular range of incoming neutrons. Solid converters in combination with Micro Pattern Gaseous Detectors (MPGDs) are proposed to meet the new requirements. Charged particles rising from the neutron capture have usually ranges larger than several millimetres in gas. This is apparently in contrast with the requirements for the position resolution. In this paper, we present an analysis technique, new in the field of neutron detection, based on the Time Projection Chamber (TPC) concept. Using a standard Single-GEM with the catho...

  16. Neutral Current Coherent Cross Sections -- Implications on Gaseous Spherical TPC's for detecting SN and Earth neutrinos

    CERN Document Server

    Giomataris, Y

    2016-01-01

    The detection of galactic supernova (SN) neutrinos represents one of the future frontiers of low-energy neutrino physics and astrophysics. The neutron coherence of neutral currents (NC) allows quite large cross sections in the case of neutron rich targets, which can be exploited in detecting earth and sky neutrinos by measuring nuclear recoils. They are relatively cheap and easy to maintain. The relevant NC cross sections are not dependent on flavor conversions and, thus, their measurement will provide useful information about the neutrino source. In particular they will yield information about the primary neutrino fluxes and perhaps about the spectrum after flavor conversions in neutrino sphere.They might also provide some clues about the neutrino mass hierarchy. The advantages of large gaseous low threshold and high resolution detectors with time projection counters (TPC) are discussed.

  17. GEM-based TPC with CCD imaging for directional dark matter detection

    Science.gov (United States)

    Phan, N. S.; Lauer, R. J.; Lee, E. R.; Loomba, D.; Matthews, J. A. J.; Miller, E. H.

    2016-11-01

    The most mature directional dark matter experiments at present all utilize low-pressure gas Time Projection Chamber (TPC) technologies. We discuss some of the challenges for this technology, for which balancing the goal of achieving the best sensitivity with that of cost effective scale-up requires optimization over a large parameter space. Critical for this are the precision measurements of the fundamental properties of both electron and nuclear recoil tracks down to the lowest detectable energies. Such measurements are necessary to provide a benchmark for background discrimination and directional sensitivity that could be used for future optimization studies for directional dark matter experiments. In this paper we describe a small, high resolution, high signal-to-noise GEM-based TPC with a 2D CCD readout designed for this goal. The performance of the detector was characterized using alpha particles, X-rays, gamma-rays, and neutrons, enabling detailed measurements of electron and nuclear recoil tracks. Stable effective gas gains of greater than 1 × 105 were obtained in 100 Torr of pure CF4 by a cascade of three standard CERN GEMs each with a 140 μm pitch. The high signal-to-noise and sub-millimeter spatial resolution of the GEM amplification and CCD readout, together with low diffusion, allow for excellent background discrimination between electron and nuclear recoils down below ∼10 keVee (∼23 keVr fluorine recoil). Even lower thresholds, necessary for the detection of low mass WIMPs for example, might be achieved by lowering the pressure and utilizing full 3D track reconstruction. These and other paths for improvements are discussed, as are possible fundamental limitations imposed by the physics of energy loss.

  18. Measurement of semi-electronic beauty-hadron decays via their impact parameter in pp collisions in ALICE

    Energy Technology Data Exchange (ETDEWEB)

    Heide, Markus Ansgar

    2014-03-19

    The measurement of beauty-hadron decays via the detection of electron tracks that are displaced from the primary vertex can be performed with ALICE, whose capabilities of electron identification and tracking fulfil all requirements for this task. While the large corresponding branching ratios guarantee sufficient yields of beauty-decay electrons at LHC energies, the wide electron impact parameter distribution due to the long lifetime and the decay kinematics of beauty hadrons allows for a separation of electrons from beauty-hadron decays from background electrons on a statistical basis. This thesis presents the analysis of electrons from beauty-hadron decays in protonproton collisions at centre-of-mass energies of 7 TeV and 2.76 TeV. Using the ALICE central-barrel detectors ITS, TPC, and TOF, p{sub T}-differential electron spectra are measured at mid-rapidity (vertical stroke y vertical stroke <0.8) for transverse momenta between 1 and 8 GeV/c. Information from the TPC and TOF signal is combined to select pure electron samples, whose signal-to-background ratio is subsequently enhanced via the requirement of a minimal impact parameter of the tracks towards the primary vertex in the x - y plane. Tracks from photon conversions occurring outside the innermost ITS layer, which have a wide impact parameter distribution, are rejected via the requirement of hits in both SPD layers of the ITS. The remaining hadron contamination in the selected electron track samples is determined on a statistical basis from the distributions of their energy deposition per unit of length in the TPC. A crucial challenge of this analysis is the subtraction of the electron background originating from charm decays, photon conversions, and light-meson decays from the measured inclusive electron spectrum. The corresponding electron yields are determined using spectra from PYTHIA simulations that are reweighted based on previous measurements of charmed hadrons, π{sup 0}, and η. Minor

  19. Measurement of semi-electronic beauty-hadron decays via their impact parameter in pp collisions in ALICE

    Energy Technology Data Exchange (ETDEWEB)

    Heide, Markus Ansgar

    2014-03-19

    The measurement of beauty-hadron decays via the detection of electron tracks that are displaced from the primary vertex can be performed with ALICE, whose capabilities of electron identification and tracking fulfil all requirements for this task. While the large corresponding branching ratios guarantee sufficient yields of beauty-decay electrons at LHC energies, the wide electron impact parameter distribution due to the long lifetime and the decay kinematics of beauty hadrons allows for a separation of electrons from beauty-hadron decays from background electrons on a statistical basis. This thesis presents the analysis of electrons from beauty-hadron decays in protonproton collisions at centre-of-mass energies of 7 TeV and 2.76 TeV. Using the ALICE central-barrel detectors ITS, TPC, and TOF, p{sub T}-differential electron spectra are measured at mid-rapidity (vertical stroke y vertical stroke <0.8) for transverse momenta between 1 and 8 GeV/c. Information from the TPC and TOF signal is combined to select pure electron samples, whose signal-to-background ratio is subsequently enhanced via the requirement of a minimal impact parameter of the tracks towards the primary vertex in the x - y plane. Tracks from photon conversions occurring outside the innermost ITS layer, which have a wide impact parameter distribution, are rejected via the requirement of hits in both SPD layers of the ITS. The remaining hadron contamination in the selected electron track samples is determined on a statistical basis from the distributions of their energy deposition per unit of length in the TPC. A crucial challenge of this analysis is the subtraction of the electron background originating from charm decays, photon conversions, and light-meson decays from the measured inclusive electron spectrum. The corresponding electron yields are determined using spectra from PYTHIA simulations that are reweighted based on previous measurements of charmed hadrons, π{sup 0}, and η. Minor

  20. ALICE makes a clean sweep at Point 2

    CERN Multimedia

    2001-01-01

    Since the middle of June the ALICE collaboration has taken up residence at Point 2, previously occupied by L3, and is now preparing the cavern for the arrival of its detector. The last muon chambers of the L3 experiment were removed at the beginning of July. Anyone who knew L3 when it was in operation will be in for a shock if they go down to the cavern at Point 2, which looks as if it's been emptied of all its contents. The members of the ALICE collaboration would not quite share that point of view, however, as some components still have to be dismantled before the cavern can receive its new detector. The collaboration, which has inherited L3's huge red magnet, took over at Point 2 in the middle of June and is now getting down to work. This is the first major stage in the installation of the future detector, which has to be ready to observe its first LHC collisions on 1 April 2006. The first difficulty is to remove the support tube running through the magnet. This huge 32-metre long, 4.5-m diameter, 300-t...

  1. Exploring Jet-Hadron correlations at the LHC with ALICE

    Science.gov (United States)

    Mazer, Joel

    2016-08-01

    In relativistic heavy ion collisions at the Large Hadron Collider (LHC), the conditions are met to produce the hot and dense, strongly interacting medium known as the Quark Gluon Plasma (QGP). The QGP, a state of matter created shortly after the Big Bang, is a phase where the deconfinement of quarks and gluons is hypothesized. Jets, the collimated sprays of hadrons from fragmenting partons, are a key probe of the medium. The experimental methods used for jet measurements at ALICE to remove, reduce, and correct for the underlying background event will be presented. In pp collisions, jet production is well understood within the framework of perturbative QCD and acts as a rigorous baseline measurement for jet quenching measurements. By comparing to heavy ion collision systems, we can study the suppression of the number of jets seen and study the modification of the pT or angular distributions of jet fragments. Azimuthal angular correlations of charged hadrons with respect to the axis of a full (charged + neutral) reconstructed (trigger) jet in Pb-Pb and pp collisions at √sNN = 2.76 TeV in ALICE will be presented here. Newly developed combinatoric background subtraction methods and their improvement compared to prior techniques will be discussed.

  2. Studies for the ALICE Inner Tracking System Upgrade

    CERN Document Server

    AUTHOR|(CDS)2079168; Musa, Luciano

    The ALICE experiment at the CERN LHC identifies D0 mesons via secondary-vertex reconstruction and topological cuts to reduce the corresponding combinatorial background in heavy-ion collisions. The D0 meson is produced promptly in initial, hard scatterings via the strong interaction or as feed-down from weakly decaying B hadrons. Within this thesis, a novel method for the separation of prompt and feed-down D0 mesons using cut variations was implemented and applied to data from p–Pb collisions at $\\sqrt(s_\\mathrm{NN})=5.02$ TeV. The effectiveness of the secondary-vertex reconstruction strongly depends on the performance and in particular the pointing resolution of the Inner Tracking System. The upgrade of the ALICE Inner Tracking System for the Long Shutdown 2 of the LHC in 2019/2020 will significantly improve its vertex-reconstruction and tracking capabilities. It will be equipped with Monolithic Active Pixel Sensors manufactured using the TowerJazz 180nm CMOS process on wafers with a high-resistivity epitax...

  3. Light flavour hadron production in the ALICE experiment at LHC

    Directory of Open Access Journals (Sweden)

    Badalà Angela

    2016-01-01

    Full Text Available Unique among the LHC experiments, ALICE has excellent particle identification capabilities for the measurement of light-flavour hadrons. A large number of hadron species from pions to multi-strange baryons and light nuclei have been measured over a large transverse momentum region. The measurement of the production of these particles is a valuable tool to study the properties of the medium formed in heavy-ion collisions. In particular they give information on the collective phenomena of the fireball, on the parton energy loss in the hot QCD medium and on the hadronization mechanisms such as recombination and statistical hadronization. The measurements in pp and in p-nucleus collisions provide the necessary baseline for heavy-ion data and help to investigate the effects of the ordinary nuclear matter. In this paper some of the main ALICE results on identified light-flavour hadron production in Pb–Pb collisions at √sNN = 2.76 TeV and p–Pb collisions at √sNN = 5.02 TeV will be presented.

  4. Studies on the upgrade of the ALICE central tracker

    CERN Document Server

    Mager, Magnus; Musa, Luciano

    2012-11-14

    When two high-energy lead ions collide, as they currently do inside the “Large Hadron Collider” (LHC) of the “European Organization for Nuclear Research” (CERN), energy densities similar to those shortly (some 1ps to 10μs) after the Big Bang are created. At these energies quarks are loosing their confinement into hadrons and may move around freely, the “quark-gluon plasma” (QGP) is created. Such a picture deserves of course a thorough check and a precise measurement. There are however intrinsic difficulties to overcome: the macroscopic free energy (about 1 mJ) of these collision allow for an infinite number of processes to happen and finally—-due to mass-energy equivalence--a significant number (order of 10,000) of particles is created. The ALICE experiment was designed to be able to cope with this large number of particles, it can measure the properties (species and momentum) of the big majority. This requires a very fine segmentation of the detector. The central part of ALICE is made of a 90 ...

  5. Alice G. Brandfonbrener, MD-A personal remembrance.

    Science.gov (United States)

    Lederman, Richard J

    2014-09-01

    Alice Brandfonbrener died peacefully at home on May 31, 2014, after a protracted illness. For all of us involved in performing arts medicine, she was the inspiration and guiding spirit. She will be missed. [Alice Brandfonbrener was one of the founding members of the field of performing arts medicine, perhaps the most critical founding member. In 1983, she organized the first "Conference on the Medical Problems of Musicians" in Aspen, Colorado, and co-directed these for the next 20 years. These symposia led to the formation of the Performing Arts Medicine Association, of which Dr. Brandfonbrener was the first president, and in 1986, establishment of the first journal in the field--this journal, Medical Problems of Performing Artists--for which she served as Editor for 20 years. At her performing arts clinic in Chicago, she saw and treated thousands of musicians, from young students to world-renowned professionals, and mentored many students and professionals who would extend research and practice in performing arts medicine.].

  6. Raw-data display and visual reconstruction validation in ALICE

    CERN Document Server

    Tadel, M

    2008-01-01

    ALICE Event Visualization Environment (AliEVE) is based on ROOT and its GUI, 2D & 3D graphics classes. A small application kernel provides for registration and management of visualization objects. CINT scripts are used as an extensible mechanism for data extraction, selection and processing as well as for steering of frequent event-related tasks. AliEVE is used for event visualization in offline and high-level trigger frameworks. Mechanisms and base-classes provided for visual representation of raw-data for different detector-types are described. Common infrastructure for thresholding and color-coding of signal/time information, placement of detector-modules in various 2D/3D layouts and for user-interaction with displayed data is presented. Methods for visualization of raw-data on different levels of detail are discussed as they are expected to play an important role during early detector operation with poorly understood detector calibration, occupancy and noise-levels. Since September 2006 ALICE applies ...

  7. Raw-data display and visual reconstruction validation in ALICE

    Science.gov (United States)

    Tadel, M.

    2008-07-01

    ALICE Event Visualization Environment (AliEVE) is based on ROOT and its GUI, 2D & 3D graphics classes. A small application kernel provides for registration and management of visualization objects. CINT scripts are used as an extensible mechanism for data extraction, selection and processing as well as for steering of frequent event-related tasks. AliEVE is used for event visualization in offline and high-level trigger frameworks. Mechanisms and base-classes provided for visual representation of raw-data for different detector-types are described. Common infrastructure for thresholding and color-coding of signal/time information, placement of detector-modules in various 2D/3D layouts and for user-interaction with displayed data is presented. Methods for visualization of raw-data on different levels of detail are discussed as they are expected to play an important role during early detector operation with poorly understood detector calibration, occupancy and noise-levels. Since September 2006 ALICE applies a regular visual-scanning procedure to simulated proton-proton data to detect any shortcomings in cluster finding, tracking and primary & secondary vertex reconstruction. A high-level of interactivity is required to allow in-depth exploration of event-structure. Navigation back to simulation records is supported for debugging purposes. Standard 2D projections and transformations are available for clusters, tracks and simplified detector geometry.

  8. Fourth Data Challenge for the ALICE data acquisition system

    CERN Multimedia

    Maximilien Brice

    2003-01-01

    The ALICE experiment will study quark-gluon plasma using beams of heavy ions, such as those of lead. The particles in the beams will collide thousands of times per second in the detector and each collision will generate an event containing thousands of charged particles. Every second, the characteristics of tens of thousands of particles will have to be recorded. Thus, to be effective, the data acquisition system (DAQ) must meet extremely strict performance criteria. To this end, the ALICE Data Challenges entail step-by-step testing of the DAQ with existing equipment that is sufficiently close to the final equipment to provide a reliable indication of performance. During the fourth challenge, in 2002, a data acquisition rate of 1800 megabytes per second was achieved by using some thirty parallel-linked PCs running the specially developed DATE software. During the final week of tests in December 2002, the team also tested the Storage Tek linear magnetic tape drives. Their bandwidth is 30 megabytes per second a...

  9. Event reconstruction performance of the ALICE High Level Trigger for p + p collisions

    CERN Document Server

    Richter, M; Alt, T; Appelshauser, H; Arend, A; Becker, B; Bottger, S; Breitner, T; Busching, H; Cicalo, C; Chattopadhyay, S; Cleymans, J; Das, I; Djuvsland, O; Erdal, H; Fearick, R; Gorbunov, S; Haaland, O S; Hille, P T; Kalcher, S; Kanaki, K; Kebschull, U; Kisel, I; Kretz, M; Lara, C; Lindal, S; Lindenstruth, V; Masoodi, A A; Ovrebekk, G; Panse, R; Peschek, J; Ploskon, M; Pocheptsov, T; Rascanu, T; Ronchetti, F; Rohr, D; Rohrich, D; Skaali, B; Steinbeck, T; Szostak, A; Thader, J; Tveter, T S; Ullaland, K; Vilakazi, Z; Weis, R; Zelnicek, P

    2011-01-01

    The ALICE High Level Trigger comprises a large computing cluster, dedicated interfaces and software applications. It allows on-line event reconstruction of the full data stream of the ALICE experiment at up to 25 GByte/s. The commissioning campaign has passed an important phase since the startup of the Large Hadron Collider in November 2009. The system has been transferred into continuous operation with focus on the event reconstruction and first simple trigger applications. The paper reports for t he first time on the achieved event reconstruction performance in the ALICE central barrel region.

  10. Development of Microstrip Silicon Detectors for Star and ALICE

    CERN Document Server

    Arnold, L; Coffin, J P; Guillaume, G; Guthneck, L; Higueret, S; Hundt, F; Kühn, C E; Lutz, Jean Robert; Pozdniakov, S; Rami, F; Tarchini, A; Boucham, A; Bouvier, S; Erazmus, B; Germain, M; Giliberto, S; Martin, L; Le Moal, C; Roy, C; Colledani, C; Dulinski, W; Turchetta, R

    1998-01-01

    The physics program of STAR and ALICE at ultra-relativistic heavy ion colliders, RHIC and LHC respectively, requires very good tracking capabilities. Some specific quark gluon plasma signatures, based on strange matter measurements implies quite a good secondary vertex reconstruction.For this purpose, the inner trackers of both experiments are composed of high-granularity silicon detectors. The current status of the development of double-sided silicon microstrip detectors is presented in this work.The global performance for tracking purpose adn particle identification are first reviewed. Then tests of the detectors and of the associated readout electronics are described. In-beam measurements of noise, spatial resolution, efficiency and charge matching capability, as well as radiation hardness, are examined.

  11. Specification and Simulation of the ALICE Trigger and DAQ System

    Institute of Scientific and Technical Information of China (English)

    T.Anticic; G.DiMarzoSerugendo; 等

    2001-01-01

    The ALICE Trigger and Data Acquisition (TRG/DAQ) System is required to support an aggregate event building bandwidth of up to 4 GByte/s and a storage capability of up to 1.25 GByte/s to mass storage.The system has been decomposed in a set of hardware and software components and prototypes of these components are being developed.It is necessary to verity the system design,its capability to reach the expected behavior and the target performances,discover possible bottlenecks and ways to correct for them,and explore alternative algorithms and new architectures.To achieve this the complete TRG/DAQ system has been formally specified.and the verification of the expected behavior has been performed through the execution of the specification,Two tools were used for this.Foresight,and Ptolemy.

  12. Intrusion Prevention and Detection in Grid Computing - The ALICE Case

    CERN Document Server

    Gomez, Andres; Kebschull, Udo

    2015-01-01

    Grids allow users flexible on-demand usage of computing resources through remote communication networks. A remarkable example of a Grid in High Energy Physics (HEP) research is used in the ALICE experiment at European Organization for Nuclear Research CERN. Physicists can submit jobs used to process the huge amount of particle collision data produced by the Large Hadron Collider (LHC). Grids face complex security challenges. They are interesting targets for attackers seeking for huge computational resources. Since users can execute arbitrary code in the worker nodes on the Grid sites, special care should be put in this environment. Automatic tools to harden and monitor this scenario are required. Currently, there is no integrated solution for such requirement. This paper describes a new security framework to allow execution of job payloads in a sandboxed context. It also allows process behavior monitoring to detect intrusions, even when new attack methods or zero day vulnerabilities are exploited, by a Machin...

  13. Performance of the ALICE secondary vertex b-tagging algorithm

    CERN Document Server

    INSPIRE-00262232

    2016-01-01

    The identification of jets originating from beauty quarks in heavy-ion collisions is important to study the properties of the hot and dense matter produced in such collisions. A variety of algorithms for b-jet tagging was elaborated at the LHC experiments. They rely on the properties of B hadrons, i.e. their long lifetime, large mass and large multiplicity of decay products. In this work, the b-tagging algorithm based on displaced secondary-vertex topologies is described. We present Monte Carlo based performance studies of the algorithm for charged jets reconstructed with the ALICE tracking system in p-Pb collisions at $\\sqrt{s_\\text{NN}}$ = 5.02 TeV. The tagging efficiency, rejection rate and the correction of the smearing effects of non-ideal detector response are presented.

  14. Performance of prototypes for the ALICE electromagnetic calorimeter

    CERN Document Server

    Allen, J; Badala, A; Baumgart, S; Bellwied, R; Benhabib, L; Bernard, C; Bianchi, N; Blanco, F; Bortoli, Y; Bourdaud, G; Bourrion, O; Boyer, B; Bruna, E; Butterworth, J; Caines, H; Calvo Diaz Aldagalan, D; Capitani, G P; Carcagno, Y; Casanova Diaz, A; Cherney, M; Conesa Balbastre, G; Cormier, T M; Cunqueiro Mendez, L; Delagrange, H; Del Franco, M; Dialinas, M; Di Nezza, P; Donoghue, A; Elnimr, M; Enokizono, A; Estienne, M; Faivre, J; Fantoni, A; Fichera, F; Foglio, B; Fresneau, S; Fujita, J; Furget, C; Gadrat, S; Garishvili, I; Germain, M; Giudice, N; Gorbunov, Y; Grimaldi, A; Guardone, N; Guernane, R; Hadjidakis, C; Hamblen, J; Harris, J W; Hasch, D; Heinz, M; Hille, P T; Hornback, D; Ichou, R; Jacobs, P; Jangal, S; Jayananda, K; Klay, J L; Knospe, A G; Kox, S; Kral, J; Laloux, P; LaPointe, S; La Rocca, P; Lewis, S; Li, Q; Librizzi, F; Madagodahettige Don, D; Martashvili, I; Mayes, B; Milletto, T; Muccifora, V; Muller, H; Muraz, J F; Nattrass, C; Noto, F; Novitzky, N; Odyniec, G; Orlandi, A; Palmeri, A; Pappalardo, G S; Pavlinov, A; Pesci, W; Petrov, V; Petta, C; Pichot, P; Pinsky, L; Ploskon, M; Pompei, F; Pulvirenti, A; Putschke, J; Pruneau, C A; Rak, J; Rasson, J; Read, K F; Real, J S; Reolon, A R; Riggi, F; Riso, J; Ronchetti, F; Roy, C; Roy, D; Salemi, M; Salur, S; Sharma, M; Silvermyr, D; Smirnov, N; Soltz, R; Sparti, V; Stutzmann, J.-S; Symons, T J.M; Tarazona Martinez, A; Tarini, L; Thomen, R; Timmins, A; van Leeuwen, M; Vieira, R; Viticchie, A; Voloshin, S; Wang, D; Wang, Y; Ward, R M

    2010-01-01

    The performance of prototypes for the ALICE electromagnetic sampling calorimeter has been studied in test beam measurements at FNAL and CERN. A $4\\times4$ array of final design modules showed an energy resolution of about 11% /$\\sqrt{E(\\mathrm{GeV})}$ $\\oplus$ 1.7 % with a uniformity of the response to electrons of 1% and a good linearity in the energy range from 10 to 100 GeV. The electromagnetic shower position resolution was found to be described by 1.5 mm $\\oplus$ 5.3 mm /$\\sqrt{E \\mathrm{(GeV)}}$. For an electron identification efficiency of 90% a hadron rejection factor of $>600$ was obtained.

  15. High Level Trigger System for the ALICE Experiment

    Institute of Scientific and Technical Information of China (English)

    U.Frankenfeld; H.Helstrup; 等

    2001-01-01

    The ALICE experiment [1] at the Large Hadron Collider(LHC) at CERN will detect up to 20,000 particles in a single Pb-Pb event resulting in a data rate of -75 MByte/event,The event rate is limited by the bandwidth of the data storage system.Higher rates are possible by selecting interesting events and subevents (High Level trigger) or compressing the data efficiently with modeling techniques.Both require a fast parallel pattern recognition.One possible solution to process the detector data at such rates is a farm of clustered SMP nodes,based on off-the-shelf PCs,and connected by a high bandwidt,low latency network.

  16. AliEn: ALICE Environment on the GRID

    CERN Document Server

    CERN. Geneva

    2012-01-01

    AliEn is the GRID middleware used by the ALICE collaboration. It provides all the components that are needed to manage the distributed resources. AliEn is used for all the computing workflows of the experiment: Montecarlo production, data replication and reconstruction and organixed or chaotic user analysis. Moreover, AliEn is also being used by other experiments like PANDA and CBM. The main components of AliEn are a centralized file and metadata catalogue, a job execution model and file replication model. These three components have been evolving over the last 10 years to make sure that the satisfy the computing requirements of the experiment, which keep increasing every year.

  17. Bottomonium production at forward rapidity with ALICE at the LHC

    CERN Document Server

    Marchisone, Massimiliano

    2015-01-01

    Bottomonium production is a powerful tool to investigate hadron collisions and the properties of the medium created in heavy-ion collisions. According to the color-screening model, these mesons give important information about the deconfined medium called Quark-Gluon Plasma (QGP) produced in ultrarelativistic heavy-ion collisions. Cold nuclear matter (CNM) effects can modify the bottomonium production even in absence of deconfined matter: the study of proton-nucleus collisions is therefore essential to disentangle these effects from the hot ones. Last but not least, measurement in pp collisions serve as crucial test of different QCD models of quarkonium hadroproduction and provide the reference for the study in nucleus-nucleus collisions. In ALICE, bottomonium is measured at forward rapidity ($2.5 < y < 4$) down to zero transverse momentum, exploiting the dimuon decay channel. The latest results in pp, Pb-Pb and p-Pb collisions are discussed and compared to theoretical calculations.

  18. ALICE at LHC: first data from p+p and perspectives for A+A

    NARCIS (Netherlands)

    Peitzmann, T.

    2010-01-01

    Outline: Hot and dense QCD matter: Examples of previous data and theoretical understanding; Perspectives for heavy-ion collisions at LHC. The ALICE experiment: Experimental setup, commissioning, calibration; Detector performance. First results from p+p collisions: Multiplicity measurements; I

  19. J/ψ production measurement at midrapidity from pp to Pb-Pb collisions with ALICE

    Directory of Open Access Journals (Sweden)

    Mastroserio Annalisa

    2014-04-01

    Full Text Available The charmonium states provide essential information on the properties of a new state of matter predicted to be formed at extreme energy densities and temperatures, the Quark Gluon Plasma (QGP. ALICE is an experiment at LHC dedicated to the study of the QGP state in heavy ion collisions. The ALICE results on the J/ψ production using the dielectron decay channel in pp collisions at 7 TeV and Pb-Pb collisions at √sNN = 2.76 TeV will be discussed. Due to its excellent vertexing capabilities, ALICE can separate the non-prompt J//ψ component thus allowing for a measurement of the beauty production. beauty production. ALICE is the only experiment that measures the charmonium production at central rapidity (|y| < 0.9 down to pT=0.

  20. FLUKA Simulation of Particle Fluences to ALICE due to LHC Injection Kicker Failures

    CERN Document Server

    Shetty, N V; Di Mauro, A; Lechner, A; Leogrande, E; Uythoven, J

    2014-01-01

    The counter-rotating beams of the LHC are injected in insertion regions which also accommodate the ALICE and LHCb experiments. An assembly of beam absorbers ensures the protection of machine elements in case of injection kicker failures, which can affect either the injected or the stored beam. In the first years of LHC operation, secondary particle showers due to beam impact on the injection beam stopper caused damage to the MOS injectors of the ALICE silicon drift detector as well as high-voltage trips in other ALICE subdetectors. In this study, we present FLUKA [1,2] simulations of particle fluences to the ALICE cavern for injection failures encountered during operation. Two different cases are reported, one where the miskicked beam is fully intercepted and one where the beam grazes the beam stopper.

  1. Topological selections for V0 (K0s, Lambda) and Cascade (Xi, Omega) reconstruction in ALICE

    CERN Multimedia

    Maire, Antonin

    2011-01-01

    The figures are illustrations of topological selections used by ALICE to reconstruct ϕ(1020), V0 particles (K°s and Λ, single-strange particles) and cascades (Ξ- and Ω-, charged multi-strange baryons).

  2. Study of the influence of design parameters of MAPS for the ALICE ITS Upgrade: Project Report

    CERN Document Server

    Munteanu, Laura-Iuliana

    2016-01-01

    This report illustrates the results of measurements performed on various MAPS chips used during the R&D phase for the ALICE ITS Upgrade. It lists the influence that pixel design parameters have on the performance of the chips.

  3. Studies for the ALICE inner tracking system upgrade

    Energy Technology Data Exchange (ETDEWEB)

    Reidt, Felix

    2016-04-28

    The ALICE experiment at the CERN LHC identifies D{sup 0} mesons via secondary-vertex reconstruction and topological cuts to reduce the corresponding combinatorial background in heavy-ion collisions. The D{sup 0} meson is produced promptly in initial, hard scatterings via the strong interaction or as feed-down from weakly decaying B hadrons. Within this thesis, a novel method for the separation of prompt and feed-down D{sup 0} mesons using cut variations was implemented and applied to data from p-Pb collisions at √(s{sub NN})=5.02 TeV. The effectiveness of the secondary-vertex reconstruction strongly depends on the performance and in particular the pointing resolution of the Inner Tracking System. The upgrade of the ALICE Inner Tracking System for the Long Shutdown 2 of the LHC in 2019/2020 will significantly improve its vertex-reconstruction and tracking capabilities. It will be equipped with Monolithic Active Pixel Sensors manufactured using the TowerJazz 180 nm CMOS process on wafers with a high-resistivity epitaxial layer. In another part of this thesis, several pixel-chip prototypes of the ALPIDE architecture with in-pixel amplification and discrimination as well as in-matrix data reduction were characterised. The pALPIDE-2 prototype was measured to fulfil the requirements in terms of detection efficiency, fake-hit rate, position resolution and tolerance to irradiation with non-ionising energy loss. Based on simulations modelling the tracking and vertex-reconstruction performance of the upgraded Inner Tracking System, the perspective of the feed-down separation using cut variations after the upgrade was assessed within this thesis.

  4. The Rosetta Alice Ultraviolet Spectrograph Investigation: The First UV Spectrograph to Reach a Comet—Results Overview

    Science.gov (United States)

    Stern, S. Alan; Parker, Joel Wm.; A'Hearn, Michael F.; Bertaux, Jean-Loup; Feaga, Lori M.; Feldman, Paul D.; Keeney, Brian A.; Noonan, John; Schindhelm, Eric; Steffl, Andrew; Weaver, Harold A.

    2016-10-01

    Numerous scientific results have been obtained from the exploration of comet 67P/Churyumov-Gerasimenko by the ESA/NASA Rosetta mission. The Alice far/extreme-UV spectrograph aboard Rosetta is one of three US instruments provided by NASA to this mission; it is the first UV spectrograph to reach any comet. We will summarize the main results obtained by the Alice instrument to date, including both surface and coma studies. Notable results we will highlight will include: the discovery of electron impact excitation as the dominant UV emission mechanism near the comet, the detection of molecular oxygen at surprisingly high abundance in the coma, the lack of strong water-ice signatures on the comet's surface during the approach to perihelion, numerous results concerning cometary outbursts, and a large database of systematics relating to atomic and molecular species abundances as the comet approached and then receded from the Sun over a span of two year surrounding the comet's August 2015 perihelion.

  5. TPC码在PCM-FM遥测系统中的性能仿真%Performance simulation of TPC code in PCM-FM telemetry system

    Institute of Scientific and Technical Information of China (English)

    张定云; 向冰

    2012-01-01

    Using Matlab to build PCM-FM telemetry system and TPC code simulation model. The performance simulation of TPC code in PCM-FM telemetry system is introduced. The simulation result shows that the TPC code of code-rate is 0. 5 can gain 5 Db. Parameters of TPC decoding are simulated in this paper.%利用Matlab搭建PCM-FM遥测系统和TPC编解码仿真模型,通过仿真验证在PCM-FM遥测系统中使用TPC码后对系统的误码率改善情况.由仿真结果可知,在TPC码码率为0.5时可获得5 dB左右的增益,同时还对影响TPC增益的各个解码参数进行了详细仿真.

  6. A hardware implementation of Region-of-Interest selection in LAr-TPC for data reduction and triggering

    Energy Technology Data Exchange (ETDEWEB)

    Baibussinov, B; Centro, S; Cieslik, K; Dequal, D; Farnese, C; Fava, A; Gibin, D; Guglielmi, A; Meng, G; Pietropaolo, F; Scantamburlo, E; Varanini, F; Ventura, S [INFN - Sezione di Padova, Via Marzolo 8 35131 Padova (Italy); Rubbia, C, E-mail: francesco.pietropaolo@pd.infn.it [Laboratori Nazionali del Gran Sasso dell' INFN, I-67010 Assergi (Italy)

    2010-12-15

    Large Liquid Argon TPC detectors in the range of multi-kton mass for neutrino and astroparticle physics require the extraction and treatment of signals from some 10{sup 5} wires. In order to increase the throughput of the DAQ system an on-line lossless data compression has been realized reducing by almost a factor 4 the data flow. Moreover a new efficient on-line identification algorithm of wire hits was studied, implemented on the ICARUS digital read-out boards and fully tested on the ICARINO LAr-TPC facility operated at LNL INFN Laboratory with cosmic-rays. This system permits the extraction of the event Region-of-Interest maximizing the global throughput of the DAQ and the realization of a trigger based on charge deposition on the wires. Capability to trigger isolated low energy events down to few MeV visible energy was also demonstrated.

  7. Experimental observation of an extremely high electron lifetime with the ICARUS-T600 LAr-TPC

    CERN Document Server

    Antonello, M; Benetti, P; Boffelli, F; Bubak, A; Calligarich, E; Centro, S; Cesana, A; Cieslik, K; Cline, D B; Cocco, A G; Dabrowska, A; Dermenev, A; Dolfini, R; Falcone, A; Farnese, C; Fava, A; Ferrari, A; Fiorillo, G; Gibin, D; Gninenko, S; Guglielmi, A; Haranczyk, M; Holeczek, J; Kirsanov, M; Kisiel, J; Kochanek, I; Lagoda, J; Mania, S; Menegolli, A; Meng, G; Montanari, C; Otwinowski, S; Picchi, P; Pietropaolo, F; Plonski, P; Rappoldi, A; Raselli, G L; Rossella, M; Rubbia, C; Sala, P; Scaramelli, A; Segreto, E; Sergiampietri, F; Stefan, D; Sulej, R; Szarska, M; Terrani, M; Torti, M; Varanini, F; Ventura, S; Vignoli, C; Wang, H; Yang, X; Zalewska, A; Zani, A; Zaremba, K

    2014-01-01

    The ICARUS T600 detector, the largest liquid Argon Time Projection Chamber (LAr-TPC) realized after many years of RD activities, was installed and successfully operated for 3 years at the INFN Gran Sasso underground Laboratory. One of the most important issues was the need of an extremely low residual electronegative impurity content in the liquid Argon, in order to transport the free electrons created by the ionizing particles with a very small attenuation along the drift path. The solutions adopted for the Argon re-circulation and purification systems have permitted to reach impressive results in terms of Argon purity and a free electron lifetime exceeding 15 ms, corresponding to about 20 parts per trillion of equivalent O2 contamination, a milestone for any future project involving LAr-TPC's and the development of higher detector mass scales.

  8. A hardware implementation of Region-of-Interest selection in LAr-TPC for data reduction and triggering

    CERN Document Server

    Baibussinov, B; Cieslik, K.; Dequal, D.; Farnese, C.; Fava, A.; Gibin, D.; Guglielmi, A.; Meng, G.; Pietropaolo, F.; Rubbia, C.; Scantamburlo, E.; Varanini, F.; Ventura, S.; 10.1088/1748-0221/5/12/P12006

    2010-01-01

    Large Liquid Argon TPC detectors in the range of multikton mass for neutrino and astroparticle physics require the extraction and treatment of signals from some 105 wires. In order to enlarge the throughtput of the DAQ system an on-line lossless data compression has been realized reducing almost a factor 4 the data flow. Moreover a trigger system based on a new efficient on-line identification algorithm of wire hits was studied, implemented on the actual ICARUS digital read- out boards and fully tested on the ICARINO LAr-TPC facility operated at LNL INFN Laboratory with cosmic-rays. Capability to trigger isolated low energy events down to 1 MeV visible energy was also demonstrated.

  9. Beam test results of the irradiated Silicon Drift Detector for ALICE

    CERN Document Server

    Kushpil, S; Giubellino, P.; Idzik, M.; Kolozhvari, A.; Kushpil, V.; Martinez, M.I.; Mazza, G.; Mazzoni, A.; Meddi, F.; Nouais, D.; Petracek, V.; Piemonte, C.; Rashevsky, A.; Riccati, L.; Rivetti, A.; Tosello, F.; Vacchi, A.; Wheadon, R.

    2006-01-01

    The Silicon Drift Detectors will equip two of the six cylindrical layers of high precision position sensitive detectors in the ITS of the ALICE experiment at LHC. In this paper we report the beam test results of a SDD irradiated with 1 GeV electrons. The aim of this test was to verify the radiation tolerance of the device under an electron fluence equivalent to twice particle fluence expected during 10 years of ALICE operation.

  10. Measurement of Photomultipier Plateau Curves and Single MIP response in the AD detector at ALICE

    CERN Document Server

    Sanchez Falero, Sebastian De Jesus

    2015-01-01

    The Alice Diffractive (AD) detector is a forward detector in the ALICE experiment at CERN. It is aimed to the triggering on diffractive events and extends the pseudorapidity coverage to about 4.9 < /n/ < 6.3. In this work, a PMT's efficiency plateau and single MIP response are measured using a replica of the detector's scintillator modules, electronic and data acquisition system and cosmic rays as particle source.

  11. Characterization of a medium size Xe/TMA TPC instrumented with microbulk Micromegas, using low-energy \\gamma-rays

    CERN Document Server

    Alvarez, V; Carcel, S; Castel, J; Cebrian, S; Cervera, A; Conde, C A N; Dafni, T; Dias, T H V T; Diaz, J; Egorov, M; Esteve, R; Evtoukhovitch, P; Fernandes, L M P; Ferrario, P; Ferreira, A L; Freitas, E D C; Gehman, V M; Gil, A; Goldschmidt, A; Gomez, H; Gomez-Cadenas, J J; Gonzalez-Diaz, D; Gutierrez, R M; Hauptman, J; Morata, J A Hernando; Herrera, D C; Iguaz, F J; Irastorza, I G; Jinete, M A; Labarga, L; Laing, A; Liubarsky, I; Lopes, J A M; Lorca, D; Losada, M; Luzon, G; Mari, A; Martin-Albo, J; Martinez, A; Martinez-Lema, G; Miller, T; Moiseenko, A; Monrabal, F; Monteiro, C M B; Mora, F J; Moutinho, L M; Vidal, J Munoz; da Luz, H Natal; Navarro, G; Nebot-Guinot, M; Nygren, D; Oliveira, C A B; Palma, R; Perez, J; Aparicio, J L Perez; Renner, J; Ripoll, L; Rodriguez, A; Rodriguez, J; Santos, F P; Santos, J M F dos; Segui, L; Serra, L; Shuman, D; Simon, A; Sofka, C; Sorel, M; Toledo, J F; Tomas, A; Torrent, J; Tsamalaidze, Z; Vazquez, D; Veloso, J F C A; Villar, J A; Webb, R C; White, J T; Yahlali, N; Aznar, F; Calvet, D; Druillole, F; Ferrer-Ribas, E; Garcia, J A; Giomataris, I; Gracia, J; Coguie, A Le; Mols, J P; Pons, P; Ruiz, E

    2013-01-01

    NEXT-MM is a general-purpose high pressure (10 bar, $\\sim25$ l active volume) Xenon-based TPC, read out in charge mode with an 8 cm $\\times$8 cm-segmented 700 cm$^2$ plane (1152 ch) of the latest microbulk-Micromegas technology. It has been recently commissioned at University of Zaragoza as part of the R&D of the NEXT $0\

  12. A prototype of a directional detector for non-baryonic dark matter search: MIMAC (Micro-TPC Matrix of Chambers)

    Energy Technology Data Exchange (ETDEWEB)

    Grignon, C; Bernard, G; Billard, J; Bosson, G; Bourrion, O; Guillaudin, O; Koumeir, C; Mayet, F; Santos, D [LPSC, Universite Joseph Fourier Grenoble 1, CNRS/IN2P3, Institut Polytechnique de Grenoble, 53 avenue des Martyrs, 38026 Grenoble (France); Colas, P; Ferrer, E; Giomataris, I [IRFU/DSM/CEA, CEA Saclay, 91191 Gif-sur-Yvette Cedex (France); Allaoua, A; Lebreton, L, E-mail: cyril.grignon@lpsc.in2p3.f [IRSN 13115 Saint-Paul-Lez-Durance (France)

    2009-11-15

    We have developed a micro-tpc using a pixelized bulk micromegas coupled to dedicated acquisition electronics as a read-out allowing to reconstruct the three dimensional track of a few keV recoils. The prototype has been tested with the Amande facility at the IRSN-Cadarache providing monochromatic neutrons. The first results concerning discrimination of a few keV electrons and proton recoils are presented.

  13. A prototype of a directional detector for non-baryonic dark matter search: MIMAC (Micro-TPC Matrix of Chambers)

    CERN Document Server

    Grignon, C; Billard, J; Bosson, G; Bourrion, O; Guillaudin, O; Koumeir, C; Mayet, F; Santos, D; Colas, P; Ferrer, E; Giomataris, Yu; Allaoua, A; Lebreton, L

    2009-01-01

    We have developed a micro-tpc using a pixelized bulk micromegas coupled to dedicated acquisition electronics as a read-out allowing to reconstruct the three dimensional track of a few keV recoils. The prototype has been tested with the Amande facility at the IRSN-Cadarache providing monochromatic neutrons. The first results concerning discrimination of a few keV electrons and proton recoils are presented.

  14. GEM-based TPC with CCD Imaging for Directional Dark Matter Detection

    CERN Document Server

    Phan, N S; Lee, E R; Loomba, D; Matthews, J A J; Miller, E H

    2015-01-01

    Directional dark matter detection will require scale-ups to large volumes if low-pressure gas Time Projection Chambers (TPCs) are the only viable technology. We discuss some of the challenges for this technology, where balancing the goal of achieving the best sensitivity with that of cost effective scale-up requires an optimization over a large parameter space. Critical for this are the precision measurements of the fundamental properties of both electron and nuclear recoil tracks down to the lowest energies. Such measurements would provide a benchmark for background discrimination and directional sensitivity that could be used for future optimization studies for directional dark matter experiments. In this paper we describe a small, high resolution, high signal-to-noise GEM-based TPC with a 2D CCD readout designed for this goal. The performance of the detector was characterized using X-rays, gamma-rays, and neutrons, enabling detailed measurements of electron and nuclear recoil tracks. Stable effective gas g...

  15. TREX-DM: a low background Micromegas-based TPC for low mass WIMP detection

    CERN Document Server

    Iguaz, F J; Aznar, F; Castel, J F; Cebrian, S; Dafni, T; Garcia, J A; Gomez, H; Gonzalez-Diaz, D; Irastorza, I G; Lagraba, A; Luzon, G; Peiro, A; Rodriguez, A

    2015-01-01

    Dark Matter experiments are recently focusing their detection techniques in low-mass WIMPs, which requires the use of light elements and low energy threshold. In this context, we present the TREX-DM experiment, a low background Micromegas-based TPC for low-mass WIMP detection. Its main goal is the operation of an active detection mass $\\sim$0.300 kg, with an energy threshold below 0.4 keVee and fully built with previously selected radiopure materials. This article describes the actual setup, the first results of the comissioning in Ar+2\\%iC$_4$H$_{10}$ at 1.2 bar and the future updates for a possible physics run at the Canfranc Underground Laboratory in 2016. A first background model is also presented, based on Geant4 simulations and a muon/electron discrimination method. In a conservative scenario, TREX-DM could be sensitive to DAMA/LIBRA and other hints of positive WIMPs signals, with some space for improvement with a neutron/electron discrimination method or the use of other light gases.

  16. TREX-DM: a low background Micromegas-based TPC for low-mass WIMP detection

    CERN Document Server

    Iguaz, F J; Aznar, F; Castel, J F; Cebrian, S; Dafni, T; Garcia, J A; Irastorza, I G; Lagraba, A; Luzon, G; Peiro, A

    2016-01-01

    Dark Matter experiments are recently focusing their detection techniques in low-mass WIMPs, which requires the use of light elements and low energy threshold. In this context, we describe the TREX-DM experiment, a low background Micromegas-based TPC for low-mass WIMP detection. Its main goal is the operation of an active detection mass $\\sim$0.3 kg, with an energy threshold below 0.4 keVee and fully built with previously selected radiopure materials. This work describes the commissioning of the actual setup situated in a laboratory on surface and the updates needed for a possible physics run at the Canfranc Underground Laboratory (LSC) in 2016. A preliminary background model of TREX-DM is also presented, based on a Geant4 simulation, the simulation of the detector's response and two discrimination methods: a conservative muon/electron and one based on a neutron source. Based on this background model, TREX-DM could be competitive in the search for low-mass WIMPs. In particular it could be sensitive, e.g., to t...

  17. Dielectron production in proton-proton collisions with ALICE

    Energy Technology Data Exchange (ETDEWEB)

    Koehler, Markus Konrad

    2015-10-01

    Ultrarelativistic hadron collisions, such as delivered since a couple of years at the Large Hadron Collider (LHC), provide new insights into the properties of strongly interacting matter at high temperatures and densities, which is expected to have existed a few of a millionth seconds after the big bang. Electromagnetic probes, such as leptons and photons, are emitted during the entire collision. Since they do not undergo strong interactions, they reflect the entire evolution of the collision. Pairs of leptons, so called dileptons, have the advantage compared to real photons, that they do not only carry momentum, but also have a non-zero invariant mass. The invariant mass spectrum of dileptons is a superposition of several components and allows to address different characteristics of the medium. To understand dielectron production in heavy-ion collisions, reference measurements in proton-proton (pp) collisions are necessary. pp collisions reflect the vacuum contribution of the particles produced in heavy-ion collisions. The analysis of pp collisions is an essential step towards the extraction of medium influences on the vector meson spectral functions and the thermal radiation in heavy-ion collisions. In this thesis, the production of electron-positron pairs (dielectrons) in pp collisions at a collision energy of 7 TeV in the ALICE central barrel is analysed. ALICE has unique particle identification capabilities at low momentum. Electrons and positrons are identified with a high purity and combined to pairs. The invariant mass distribution of dielectrons is corrected for detector effects and the selection criteria in the analysis with Monte Carlo simulations. The dielectron invariant mass spectrum of known hadronic sources is calculated based on the cross sections measured in other decay channels using the known decay kinematics. This so called hadronic cocktail represents the dielectron spectrum at the moment of kinematic freeze-out and can be compared to the

  18. A Preshower Photon Multiplicity Detector for the ALICE Experiment

    CERN Document Server

    Aggarwal, M M; Baba, P V K S; Badyal, S K; Bharti, A; Bhasin, A; Bhati, A K; Bhatia, V S; Chattopadhyay, S; Dubey, A K; Dutta-Majumdar, M R; Mazumdar, K; Ganti, M S; Ghosh, P; Sen-Gupta, A; Gupta, V K; Mahapatra, D P; Mangotra, L K; Mohanty, B; Nayak, T K; Phatak, S C; Raniwala, R; Raniwala, S; Rao, N K; Sambyal, S S; Singaraju, R N; Sinha, B; Trivedi, M D; Viyogi, Y P

    1999-01-01

    A preshower Photon Multiplicity Detector (PMD) is proposed to be implemented in the ALICE experiment to study event shapes and isospin fluctuations. The PMD, to be mounted on the magnet door at 6m from the vertex, has fine granularity and full azimuthal coverage in the pseudo-rapidity region 1.8

  19. ITW ALICE spokesperson elect on lead-proton collisions 2016

    CERN Multimedia

    ALICE experiment cavern LHC IP2

    2016-01-01

    Federico Antinori describes the ALICE experiment's objectives for this year's collisions at the LHC between lead ions and protons. The study of these asymmetric collisons will give physicists more precise insights into the state of the universe a few millionths of a second after the Big Bang. During this brief period, the universe was filled with all kinds of particles moving about at near light speed. The mixture was dominated by quarks –fundamental units of matter – and by gluons, carriers of the strong force that normally bind quarks into familiar protons and neutrons. In those first moments of extreme temperatures and densities, protons and neutrons had not yet formed and the quarks and gluons were bound only weakly, free to move on their own in what’s called a quark-gluon plasma. Normally, physicists recreate these conditions by colliding two beams both made up of the same type of heavy ions, such as lead. But one night in September 2012, LHC physicists chose to collide beams made

  20. ALICE: structures weighing several tonnes are moved with millimetric precision

    CERN Multimedia

    2005-01-01

    The ALICE collaboration has just conducted one of its most spectacular transport operations to date in lifting the dipole of the muon spectrometer and reassembling it on the other side of the huge solenoid magnet. This incredible feat involved lifting no fewer than 900 tonnes of equipment over the red octagonal yoke inherited from the L3 experiment at a height of 18 metres. Following initial assembly and successful testing at the end of last year (see Bulletin No. 4/2005), the dipole was completely dismantled and moved to the other end of the cavern. The yoke was transported as 28 modules, each weighing 30 tonnes. The most spectacular feat of all, though, was undoubtedly the removal of the two 32-tonne coils. The first of these was moved on 18 April, as recorded in the following photos: A special lifting gantry weighing 5 tonnes had to be developed to move and install the coils. Huge clamps, which can be seen at the front, were used to rotate these enormous 32-tonne components. The whole assembly was raised ...

  1. First ALICE results on quarkonium production at Run 2 energies

    CERN Document Server

    CERN. Geneva

    2016-01-01

    Quarkonium production in hadronic collisions (either proton-proton or heavy ions) has been extensively studied in both fixed target and collider experiments. It is understood as the production of a heavy quark pair (ccbar or bbar depending on the quarkonium state) in a hard scattering process which occurs early in the collision, followed by the evolution of this quark pair into a colorless bound state. While the production of the quark pair is reasonably well described by perturbative QCD calculations, its evolution into the bound state is inherently non-perturbative and is studied experimentally in pp collisions. In heavy ion collisions on the other hand, quarkonia are used to probe the properties of the medium formed in the collision and in particular that of the quark-gluon plasma, via competing mechanisms such as color screening, thermal dissociation or recombination, as well as so-called cold nuclear matter effects such as shadowing, gluon saturation or energy loss. The first ALICE results on quarkonium...

  2. Open-charm production measurements with ALICE at the LHC

    Science.gov (United States)

    Pagano, P.

    2016-11-01

    The LHC heavy-ion physics program aims at investigating the properties of strongly-interacting matter under extreme conditions of temperature and energy density where the formation of the Quark-Gluon Plasma (QGP) is expected. Heavy-flavour hadrons, containing charm and beauty quarks, are considered efficient probes to investigate the properties of the QGP produced in heavy-ion collisions. Heavy quarks are produced in hard partonic scattering processes in the initial stage of hadronic collisions and propagate through the hot and dense medium created in the collision losing energy interacting with the medium via radiative and collisional processes. The high precision tracking, good vertexing capabilities and excellent particle identification offered by the ALICE experiment allow us to measure particles containing heavy quarks in a wide transversemomentum range in pp, p-Pb and Pb-Pb collisions. A review of the main results on prompt D-mesons production, reconstructed via their hadronic decays at mid-rapidity, in pp collisions at √s = 7 TeV, p-Pb collisions at √sNN = 5.02 TeV and Pb-Pb collisions at √sNN = 2.76 TeV will be shown.

  3. Open-charm production measurements with ALICE at the LHC

    Directory of Open Access Journals (Sweden)

    Pagano P.

    2016-01-01

    Full Text Available The LHC heavy-ion physics program aims at investigating the properties of strongly-interacting matter under extreme conditions of temperature and energy density where the formation of the Quark-Gluon Plasma (QGP is expected. Heavy-flavour hadrons, containing charm and beauty quarks, are considered efficient probes to investigate the properties of the QGP produced in heavy-ion collisions. Heavy quarks are produced in hard partonic scattering processes in the initial stage of hadronic collisions and propagate through the hot and dense medium created in the collision losing energy interacting with the medium via radiative and collisional processes. The high precision tracking, good vertexing capabilities and excellent particle identification offered by the ALICE experiment allow us to measure particles containing heavy quarks in a wide transversemomentum range in pp, p-Pb and Pb-Pb collisions. A review of the main results on prompt D-mesons production, reconstructed via their hadronic decays at mid-rapidity, in pp collisions at √s = 7 TeV, p-Pb collisions at √sNN = 5.02 TeV and Pb-Pb collisions at √sNN = 2.76 TeV will be shown.

  4. Recent results on anisotropic flow and related phenomena in ALICE

    CERN Document Server

    Bilandzic, Ante

    2016-01-01

    The exploration of properties of an extreme state of matter, the Quark--Gluon Plasma, has broken new ground with the recent Run 2 operation of the Large Hadron Collider with heavy-ion collisions at the highest energy to date. With the heavy-ion data taken at the end of 2015, the ALICE Collaboration has made the first observation of anisotropic flow of charged particles and related phenomena in lead--lead collisions at the record breaking energy of 5.02 TeV per nucleon pair. The Run 2 results come after the proton-lead collisions, which provided a lot of unexpected results obtained with two- and multi-particle correlation techniques. In these proceedings, a brief overview of these results will be shown. We will discuss how they further enlighten the properties of matter produced in ultrarelativistic nuclear collisions. We indicate the possibility that, to leading order, the striking universality of flow results obtained with correlation techniques in pp, p--A and A--A collisions might have purely mathematical ...

  5. Data Compression for the ALICE Silicon Drift Detector

    CERN Document Server

    De Remigis, P; CERN. Geneva; Mazza, G; Werbrouck, A E; Cavagnino, D

    1998-01-01

    The problem faced when transmitting data coming from the ADC is a typical data compression one. The data to compress may be viewed as a bit stream array containing values in the integer range [0, 255]. A large amount of these values (about 95%) should be around 0 [Alice, 1995], even though the noise will make them generally different from 0. The charges may be imagined as isolated hills (with an approximate gaussian shape) on a (approximately) planar surface. The characteristics required for the algorithm are: compression coefficient c03, which means a compression ratio C30 (where c=1/C=n0/ n1 where n0 is the number of bits exciting the algorithm and n1 is the number of bits entering the algorithm), high operating speed, easy hardware implementation, minimal size of the data structures used, low power consumption, simplicity and degree of lossiness of the algorithm tunable with parameters. A compression algorithm is termed lossy if the decompressed data is not the original data, while it is called lossless ...

  6. Trigger region unit for the ALICE PHOS calorimeter

    CERN Document Server

    Müller, Hans; Li Qing Xia; Pimenta, Rui; Röhrich, Dieter; Skaali, Bernhard; Oltean, Alexandra

    2005-01-01

    The Photon Spectrometer (PHOS) of ALICE measures electromagnetic showers of up to 100 GeV via a large matrix of PWO crystals, each read out by an APD. Trigger regions consist of 28*16 crystals, inter-connected via analogue signals generated on front-end cards and transmitted to Trigger Region Units (TRU) which digitize and process the analogue hit information. Eight TRU cards are embedded inside each PHOS module in water-cooled cassettes, each inserted between a block 14 FEE readout cards. Analogue sums are generated by fast summing shapers, with their outputs connected to the TRU via equal-length differential cables. The TRU receives analogue sums on 112 inputs and digitizes these via 12 bit ADCs which are inter-connected with a central FPGA via serial LVDS links. The level-0 and level-1 trigger algorithms are based on pipelined charge summing over 4 consecutive samples and over 4*4 crystal windows. Low latency level-0 decisions and more refined level-1 decisions are generated as a 40 MHz Yes/No sequence whi...

  7. Strange and identified hadron production at the LHC with ALICE

    CERN Document Server

    Barnby, L S

    2012-01-01

    The ALICE detector was designed to identify hadrons over a wide range of transverse momentum at mid-rapidity. Here measurements of light charged ({\\pi}, K, p) and neutral ({\\Lambda}, K0S) hadrons in Pb-Pb collisions at \\surdsNN = 2.76 TeV are presented with additional data from a pp \\surds = 7 TeV. Such measurements are crucial for understanding the properties of the fireball produced in heavy-ion collisions at the LHC. The particle-type dependence of the spectra and the yields of particles extracted give information on the expansion dynamics and chemical composition respectively. In addition studying the ratio of baryons to mesons may help in understanding the mechanisms by which hadronisation takes place. We find that, when comparing reference at \\surdsNN = 200 GeV Au+Au collisions at RHIC, a more strongly expanding system is to data from \\surdsNN = 200 GeV Au+Au collisions at RHIC, a more strongly expanding system is created with a similar relative population of hadron species. We also see that collective ...

  8. Development of high $\\beta^*$-optics for ALICE

    CERN Document Server

    Hermes, Pascal Dominik; Wessels, Johannes Peter

    This thesis describes a feasibility study for a special optical configuration in Insertion Region 2 (IR2) of the Large Hadron Collider (LHC), which is host of the ALICE detector. This configuration allows the study of elastic and diffractive scattering during LHC high-intensity proton operation, in parallel to the nominal physics studies in all LHC experiments at the design energy of 7 TeV per beam. Such measurements require the instal- lation of additional Roman Pot (RP) detectors in the very forward region, at longitudinal distances of 150 m to 220 m from the Interaction Point (IP). Apart from being adjusted for a specific betatron phase advance between the IP and the RP detectors, such a configuration must be optimized for the largest possible $\\beta^*$ -value, to be sensitive for the smallest possible four-momentum transfer $|t|$. A value of $\\beta^*$ = 18 m is compatible with a bunch spacing of 25 ns, considering the LHC design emittance of N = 3.75 μm rad, and a required bunch-bunch separation of $12 \\...

  9. Low mass dimuon production with the ALICE muon spectrometer

    CERN Document Server

    Casula, Ester Anna Rita

    Low mass vector meson ($\\rho$, $\\omega$, $\\phi$) production provides key information on the hot and dense state of strongly interacting matter produced in high-energy heavy ion collisions (called Quark Gluon Plasma). Strangeness enhancement is one of the possible signatures of the Quark Gluon Plasma formation and can be accessed through the measurement of $\\phi$ meson production with respect to $\\rho$ and $\\omega$ mesons, while the measurement of the $\\phi$ nuclear modification factor provides a powerful tool to probe the production dynamics and hadronization process in relativistic heavy ion collisions. Vector mesons can be detected through their decays into muon pairs with the ALICE muon spectrometer. This thesis presents the results on the measurement of the $\\phi$ differential cross section, as a function of the transverse momentum, in pp collisions at $\\sqrt{s}$ = 2.76 TeV; the measurement of the $\\phi$ yield and of the nuclear modification factor $R_{pA}$ at forward and backward rapidity, as a function...

  10. 基于回归模型的高端容错计算机TPC-C性能估算研究%A Regression-Based Prediction Model for TPC-C Performance of High-End Fault-Tolerant Computers

    Institute of Scientific and Technical Information of China (English)

    刘迪; 翟季冬; 陈文光

    2013-01-01

    高端容错计算机的TPC-C性能测试由于成本高昂且时间漫长,导致市场上只有少部分产品进行了该项测试,无法满足生产商和购买者的需求,高端容错计算机领域需要一种简便快捷、低成本的TPC-C性能估算方法.文中分析了影响TPC-C性能的各种因素,以近5年来发布了TPC-C测试结果的服务器为样本,利用数理统计的方法,在服务器TPC-C性能与硬件指标之间建立了线性回归模型.优化后的模型估算精度达到95%以上,在一定程度上解释了服务器的硬件指标与TPC-C性能之间的因果关系,具备了方便准确地估算TPC-C性能的现实意义.文中所提出的将数理统计的方法用于TPC-C性能估算的思路以及搜集的大量相关数据,对今后该项研究具有重要意义.%As the TPC-C performance test of high-end fault-tolerant computer cost expensively and long time,only a small part of the products on the market do the test,which can not meet the needs of producers and buyers.A simple,efficient and low-cost method for estimating the TPC-C performance is widely needed.This paper analyzes the various factor affecting the TPC-C performance,establishes a linear regression model between the TPC-C performance and hardware indicators using the method of mathematical statistics.The model takes the TPC-C test results released in the past five years as the sample.After tuning,the estimating accuracy of the model is more than 95%.The model explains the causal relationship between the server's hardware indicators and TPC-C performance to some extent,and estimates the TPC-C performance conveniently and accurately.The idea that using mathematical statistics for TPC-C performance estimation and the large volume of data collected has important significance for future study.

  11. Charmonium production in Pb-Pb collisions with ALICE at the LHC

    CERN Document Server

    Da Costa, H Pereira

    2016-01-01

    We report on published charmonium measurements performed by ALICE, at the LHC, in Pb-Pb collisions at a center of mass energy per nucleon-nucleon collision $\\sqrt{s_{\\rm NN}} = 2.76$ TeV, at both mid ($|y|<0.8$) and forward ($2.5include one or several of the following mechanisms: color screening of the charm quarks, statistical hadronization at the QGP phase boundary, balance between ${\\rm J}/\\psi$ dissociation and regeneration in the QGP, ${\\rm J}/\\psi$ interaction with a dense comoving medium. Results on the production of the heavier and less bound $\\psi'$ meson in Pb-Pb collisions at forward-rapidity are also presented a...

  12. NLO Monte Carlo predictions for heavy-quark production at the LHC. pp collisions in ALICE

    Energy Technology Data Exchange (ETDEWEB)

    Klasen, M.; Kovarik, K.; Topp, M. [Muenster Univ. (Germany). Inst. fuer Theoretische Physik 1; Klein-Boesing, C. [Muenster Univ. (Germany). Inst. fuer Kernphysik; GSI Helmholtzzentrum fuer Schwerionenforschung, Darmstadt (Germany). ExtreMe Matter Institute EMMI; Kramer, G. [Hamburg Univ. (Germany). 2. Inst. fuer Theoretische Physik; Wessels, J.P. [Muenster Univ. (Germany). Inst. fuer Kernphysik

    2014-05-15

    Next-to-leading order (NLO) QCD predictions for the production of heavy quarks in proton-proton collisions are presented within three different approaches to quark mass, resummation and fragmentation effects. In particular, new NLO and parton shower simulations with POWHEG are performed in the ALICE kinematic regime at three different centre-of-mass energies, including scale and parton density variations, in order to establish a reliable baseline for future detailed studies of heavy-quark suppression in heavy-ion collisions. Very good agreement of POWHEG is found with FONLL, in particular for centrally produced D{sup 0}, D{sup +} and D{sup *+} mesons and electrons from charm and bottom quark decays, but also with the generally somewhat higher GM-VFNS predictions within the theoretical uncertainties. The latter are dominated by scale rather than quark mass variations. Parton density uncertainties for charm and bottom quark production are computed here with POWHEG for the first time and shown to be dominant in the forward regime, e.g. for muons coming from heavy-flavour decays. The fragmentation into D{sub s}{sup +} mesons seems to require further tuning within the NLO Monte Carlo approach.

  13. NLO Monte Carlo predictions for heavy-quark production at the LHC: pp collisions in ALICE

    Science.gov (United States)

    Klasen, M.; Klein-Bösing, C.; Kovarik, K.; Kramer, G.; Topp, M.; Wessels, J. P.

    2014-08-01

    Next-to-leading order (NLO) QCD predictions for the production of heavy quarks in proton-proton collisions are presented within three different approaches to quark mass, resummation and fragmentation effects. In particular, new NLO and parton shower simulations with POWHEG are performed in the ALICE kinematic regime at three different centre-of-mass energies, including scale and parton density variations, in order to establish a reliable baseline for future detailed studies of heavy-quark suppression in heavy-ion collisions. Very good agreement of POWHEG is found with FONLL, in particular for centrally produced D 0, D + and D *+ mesons and electrons from charm and bottom quark decays, but also with the generally somewhat higher GM-VFNS predictions within the theoretical uncertainties. The latter are dominated by scale rather than quark mass variations. Parton density uncertainties for charm and bottom quark production are computed here with POWHEG for the first time and shown to be dominant in the forward regime, e.g. for muons coming from heavy-flavour decays. The fragmentation into D s mesons seems to require further tuning within the NLO Monte Carlo approach.

  14. NLO Monte Carlo predictions for heavy-quark production at the LHC: pp collisions in ALICE

    CERN Document Server

    Klasen, M; Kovarik, K; Kramer, G; Topp, M; Wessels, J

    2014-01-01

    Next-to-leading order (NLO) QCD predictions for the production of heavy quarks in proton-proton collisions are presented within three different approaches to quark mass, resummation and fragmentation effects. In particular, new NLO and parton shower simulations with POWHEG are performed in the ALICE kinematic regime at three different centre-of-mass energies, including scale and parton density variations, in order to establish a reliable baseline for future detailed studies of heavy-quark suppression in heavy-ion collisions. Very good agreement of POWHEG is found with FONLL, in particular for centrally produced D^0, D^+ and D^*+ mesons and electrons from charm and bottom quark decays, but also with the generally somewhat higher GM-VFNS predictions within the theoretical uncertainties. The latter are dominated by scale rather than quark mass variations. Parton density uncertainties for charm and bottom quark production are computed here with POWHEG for the first time and shown to be dominant in the forward reg...

  15. Study of prompt and secondary D meson decay with the ALICE experiment

    CERN Document Server

    Abdelaal, Abdelmagied

    2014-01-01

    From Monday 30 th June to Friday 22 nd August, 2014, I attended the CERN summer student training program 2014. The program introduces various useful knowledge, culture exchanges and scientific skills to my experiences. I attend in the mornings lectures, especially on theoretical topics. Furthermore, I gained fruitful skills on computational methods, concretely ROOT/AliROOT and C++ Language. I have been guided to most of experiments and detectors including ALICE, CMS and ATLAS detectors and I have also attended different workshops. A major source of uncertainty in the analysis is the unknown fraction of secondary D0 mesons coming from b-hadron decays, which has been estimated on the basis of perturbative QCD predictions and a range of hypotheses for the b-hadron nuclear modification factor is estimate. The project consists in studying whether topological variables sensitive to displacement with respect to the primary vertex, larger for secondary D–mesons, can be used to extract the fraction of D mesons from ...

  16. Gating of the two-pore cation channel AtTPC1 in the plant vacuole is based on a single voltage-sensing domain.

    Science.gov (United States)

    Jaślan, D; Mueller, T D; Becker, D; Schultz, J; Cuin, T A; Marten, I; Dreyer, I; Schönknecht, G; Hedrich, R

    2016-09-01

    The two-pore cation channel TPC1 operates as a dimeric channel in animal and plant endomembranes. Each subunit consists of two homologous Shaker-like halves, with 12 transmembrane domains in total (S1-S6, S7-S12). In plants, TPC1 channels reside in the vacuolar membrane, and upon voltage stimulation, give rise to the well-known slow-activating SV currents. Here, we combined bioinformatics, structure modelling, site-directed mutagenesis, and in planta patch clamp studies to elucidate the molecular mechanisms of voltage-dependent channel gating in TPC1 in its native plant background. Structure-function analysis of the Arabidopsis TPC1 channel in planta confirmed that helix S10 operates as the major voltage-sensing site, with Glu450 and Glu478 identified as possible ion-pair partners for voltage-sensing Arg537. The contribution of helix S4 to voltage sensing was found to be negligible. Several conserved negative residues on the luminal site contribute to calcium binding, stabilizing the closed channel. During evolution of plant TPC1s from two separate Shaker-like domains, the voltage-sensing function in the N-terminal Shaker-unit (S1-S4) vanished.

  17. ALICE Grid Computing at the GridKa Tier-1 Center

    Science.gov (United States)

    Jung, C.; Petzold, A.; Pfeiler, C.-E.; Schwarz, K.

    2012-12-01

    The GridKa center at the Karlsruhe Institute of Technology is the largest ALICE Tier-1 center. It hosts 40,000 HEPSEPC'06, approximately 2.75 PB of disk space, and 5.25 PB of tape space for the ‘A Large Ion Collider Experiment’ (ALICE), at the CERN Large Hadron Collider (LHC). These resources are accessed via the AliEn (ALICE Environment) middleware. The storage is divided into two instances, both using the storage middleware xrootd. We will focus on the set-up of these resources and on the topic of monitoring. The latter serves a vast number of purposes, ranging from efficiency statistics for process and procedure optimization to alerts for on-call duty engineers.

  18. Profiles in Performing Arts Medicine Courage--A Tribute to Dr. Alice Brandfonbrener.

    Science.gov (United States)

    Manchester, Ralph A

    2015-09-01

    I was honored and privileged to join Dr. Robert Sataloff in delivering a tribute to Dr. Alice Brandfonbrener at the 2015 Symposium on the Medical Problems of Performing Artists in Snowmass, Colorado. As virtually everyone who reads this journal knows, Dr. Brandfonbrener organized the first symposium (then focused on the medical problems of musicians), was the founding editor of Medical Problems of Performing Artists, and was the first president of the Performing Arts Medicine Association. She died in 2014, just prior to last year's symposium. This year, after Dr. Sataloff presented a very engaging overview of Alice's career and impressive accomplishments, I gave a short address that was based on some of the editorials Alice wrote in this journal during her 20 year tenure as editor. I have chosen a few examples of how the courage that she demonstrated in launching an international medical conference, a peer-reviewed medical journal, and a professional association continued to present itself in her writing.

  19. Overview of ALICE results in pp, pA and AA collisions arXiv

    CERN Document Server

    Schicker, R.

    The ALICE experiment at the Large Hadron Collider (LHC) at CERN is optimized for recording events in the very large particle multiplicity environment of heavy-ion collisions at LHC energies. The ALICE collaboration has taken data in Pb-Pb collisions in Run I and Run II at nucleon-nucleon center-of-mass energies $\\sqrt{s_{\\text{NN}}}$ = 2.76 and \\mbox{5.02 TeV}, respectively, and in pp collisions at center-of-mass energies $\\sqrt{s}$ = 0.9, 2.76, 5.02, 7, 8 and 13 TeV. The asymmetric system p-Pb was measured at a center-of-mass energy $\\sqrt{s_{\\text{NN}}}$ = 5.02 TeV. Selected physics results from the analysis of these data are presented, and an outline of the ALICE prospects for Run III is given.

  20. Recent Developments on ALICE (Accelerators and Lasers In Combined Experiments) at Daresbury Laboratory

    Energy Technology Data Exchange (ETDEWEB)

    Saveliev, Y M; Buckley, R K; Buckley, S R; Clarke, J A; Corlett, P A; Dunning, D J; Goulden, A R; Hill, S F; Jackson, F; Jamison, S P; Jones, J K; Jones, L B; Leonard, S; McIntosh, P A; McKenzie, J W; Middleman, K J; Militsyn, B L; Moss, A J; Muratori, B D; Orrett, J F; Pattalwar, S M; Phillips, P J; Scott, D J; Seddon, E A; Shepherd, B.J.A.; Smith, S L; Thompson, N; Wheelhouse, A E; Williams, P H; Harrison, P; Holder, D J; Holder, G M; Schofield, A L; Weightman, P; Williams, R L; Laundry, D; Powers, T; Priebe, G

    2010-05-01

    Progress made in ALICE (Accelerators and Lasers In Combined Experiments) commissioning and a summary of the latest experimental results are presented in this paper. After an extensive work on beam loading effects in SC RF linac (booster) and linac cavities conditioning, ALICE can now operate in full energy recovery mode at the bunch charge of 40pC, the beam energy of 30MeV and train lengths of up to 100us. This improved operation of the machine resulted in generation of coherently enhanced broadband THz radiation with the energy of several tens of uJ per pulse and in successful demonstration of the Compton Backscattering x-ray source experiment. The next steps in the ALICE scientific programme are commissioning of the IR FEL and start of the research on the first non-scaling FFAG accelerator EMMA. Results from both projects will be also reported.

  1. ALICE Measurements in p-Pb Collisions: Charged Particle Multiplicity, Centrality Determination and implications for Binary Scaling

    CERN Document Server

    Toia, Alberica

    2014-01-01

    Measurements of particle production in proton-nucleus collisions provide a reference to disentangle final state effects, i.e. signatures of the formation of a deconfined hot medium, from initial state effects, already present in cold nuclear matter. Since many initial state effects are expected to vary as a function of the number of collisions suffered by the incoming proton, it is crucial to estimate the centrality of the collision. In p-Pb collisions categorization of events into different centrality classes using a particle multiplicity distribution is complicated by the low particle multiplicities and the large multiplicity fluctuations. We present ALICE measurements of particle production in p-Pb collisions at sqrt(sNN) = 5.02$ TeV, including the pseudo-rapidity and transverse momentum dependence, we discuss the event classification in centrality classes and its implications for the measurements of nuclear modification factors.

  2. J/ψ photoproduction in Pb–Pb and p–Pb ultra-peripheral collisions with ALICE at LHC

    Energy Technology Data Exchange (ETDEWEB)

    De Gruttola, D., E-mail: daniele.de.gruttola@cern.ch

    2014-06-15

    The photoproduction of vector mesons in Ultra-Peripheral Collisions (UPC) is a powerful tool to probe the nuclear gluon distribution, for which there is considerable uncertainty in the low-x region. We present the first measurements in Pb–Pb collisions at √(s{sub NN})=2.76 TeV, performed with the ALICE detector. The J/ψ is identified via its dimuon decay in the forward rapidity region and via dimuon and dielectron decay at midrapidity. The results are compared to theoretical models for coherent J/ψ production and found to be in good agreement with models which include nuclear gluon shadowing. The cross section measurement for incoherent J/ψ and γγ→e{sup +}e{sup −} at mid-rapidity is reported. Finally we present the first results on p–Pb UPC at √(s{sub NN})=5.02 TeV.

  3. ALICE measurements in p–Pb collisions: Charged particle multiplicity, centrality determination and implications for binary scaling

    Energy Technology Data Exchange (ETDEWEB)

    Toia, Alberica, E-mail: alberica.toia@cern.ch [Istituto Nazionale di Fisica Nucleare, Padova (Italy); Goethe University Frankfurt (Germany)

    2014-06-15

    Measurements of particle production in proton–nucleus collisions provide a reference to disentangle final state effects, i.e. signatures of the formation of a deconfined hot medium, from initial state effects, already present in cold nuclear matter. Since many initial state effects are expected to vary as function of the number of collisions suffered by the incoming proton, it is crucial to estimate the centrality of the collision. In p-Pb collisions categorization of events into different centrality classes using a particle multiplicity distribution is complicated by the low particle multiplicities and the large multiplicity fluctuations. We present ALICE measurements of particle production in p-Pb collisions at √(s{sub NN})=5.02 TeV, including the pseudo-rapidity and transverse momentum dependence, and we discuss the event classification in centrality classes and its implications for the measurements of nuclear modification factors.

  4. Full kinematic reconstruction of charged B mesons with the upgraded inner tracking system of the ALICE experiment

    Energy Technology Data Exchange (ETDEWEB)

    Stiller, Johannes Hendrik

    2016-05-11

    In this thesis, the performance of the full kinematic reconstruction of B{sup +} mesons in the decay channel B{sup +}→ anti D{sup 0}π{sup +}(anti D{sup 0}→K{sup +}π{sup -}) and charge conjugates for the 0-10% most central Pb-Pb collisions at √(s{sub NN})=5.5 TeV is demonstrated for the upgraded ALICE Experiment, which is planned before Run 3 of the Large Hadron Collider (LHC), beginning in 2020. Within the scope of the foreseen detector and readout upgrades to inspect all Pb-Pb collisions at their interaction rate of 50 kHz, in particular through the installation of a new high-granularity pixel inner tracker, for the first time these rare signals will become accessible using full kinematic reconstruction in central Pb-Pb collisions in ALICE at mid-rapidity at the LHC. Topological and kinematic criteria are used to select the beauty signal against the large combinatorial and correlated background. In addition to available full Monte Carlo (MC) simulations, a fast MC simulation, which includes parameterizations of all relevant detector effects, was developed and is now generally available for all rare probe studies with the upgraded ALICE detector. The fast simulation was used to improve the estimate on the residual combinatorial background in order to maximize the expected signal-to-background ratio and statistical significance. Within the uncertainties of the expected signal yield, a significant measurement (≥5) will be possible down to p{sub T} ≥ 2.0 GeV/c, corresponding to about 88% of the yield. The signal-to-background ratio lies between 0.01 and 4.0, increasing with p{sub T}. The required reference statistics in p+p collisions at √(s)=5.5 TeV was estimated to be about 100 pb{sup -1}. Considering the calculated expected statistics, the precision of the measurements of the nuclear modification factor R{sub AA} and the elliptic flow v{sub 2} were estimated. A measurement of the theoretically predicted R{sub AA} of 0.2-0.5 above p{sub T}≥5.0 Ge

  5. Determination of the event collision time with the ALICE detector at the LHC

    CERN Document Server

    Adam, Jaroslav; Aggarwal, Madan Mohan; Aglieri Rinella, Gianluca; Agnello, Michelangelo; Agrawal, Neelima; Ahammed, Zubayer; Ahmad, Shakeel; Ahn, Sang Un; Aiola, Salvatore; Akindinov, Alexander; Alam, Sk Noor; Silva De Albuquerque, Danilo; Aleksandrov, Dmitry; Alessandro, Bruno; Alexandre, Didier; Alfaro Molina, Jose Ruben; Alici, Andrea; Alkin, Anton; Alme, Johan; Alt, Torsten; Altinpinar, Sedat; Altsybeev, Igor; Alves Garcia Prado, Caio; An, Mangmang; Andrei, Cristian; Andrews, Harry Arthur; Andronic, Anton; Anguelov, Venelin; Anson, Christopher Daniel; Anticic, Tome; Antinori, Federico; Antonioli, Pietro; Anwar, Rafay; Aphecetche, Laurent Bernard; Appelshaeuser, Harald; Arcelli, Silvia; Arnaldi, Roberta; Arnold, Oliver Werner; Arsene, Ionut Cristian; Arslandok, Mesut; Audurier, Benjamin; Augustinus, Andre; Averbeck, Ralf Peter; Azmi, Mohd Danish; Badala, Angela; Baek, Yong Wook; Bagnasco, Stefano; Bailhache, Raphaelle Marie; Bala, Renu; Balasubramanian, Supraja; Baldisseri, Alberto; Baral, Rama Chandra; Barbano, Anastasia Maria; Barbera, Roberto; Barile, Francesco; Barnafoldi, Gergely Gabor; Barnby, Lee Stuart; Ramillien Barret, Valerie; Bartalini, Paolo; Barth, Klaus; Bartke, Jerzy Gustaw; Bartsch, Esther; Basile, Maurizio; Bastid, Nicole; Basu, Sumit; Bathen, Bastian; Batigne, Guillaume; Batista Camejo, Arianna; Batyunya, Boris; Batzing, Paul Christoph; Bearden, Ian Gardner; Beck, Hans; Bedda, Cristina; Behera, Nirbhay Kumar; Belikov, Iouri; Bellini, Francesca; Bello Martinez, Hector; Bellwied, Rene; Espinoza Beltran, Lucina Gabriela; Belyaev, Vladimir; Bencedi, Gyula; Beole, Stefania; Bercuci, Alexandru; Berdnikov, Yaroslav; Berenyi, Daniel; Bertens, Redmer Alexander; Berzano, Dario; Betev, Latchezar; Bhasin, Anju; Bhat, Inayat Rasool; Bhati, Ashok Kumar; Bhattacharjee, Buddhadeb; Bhom, Jihyun; Bianchi, Livio; Bianchi, Nicola; Bianchin, Chiara; Bielcik, Jaroslav; Bielcikova, Jana; Bilandzic, Ante; Biro, Gabor; Biswas, Rathijit; Biswas, Saikat; Bjelogrlic, Sandro; Blair, Justin Thomas; Blau, Dmitry; Blume, Christoph; Bock, Friederike; Bogdanov, Alexey; Boldizsar, Laszlo; Bombara, Marek; Bonora, Matthias; Book, Julian Heinz; Borel, Herve; Borissov, Alexander; Borri, Marcello; Botta, Elena; Bourjau, Christian; Braun-munzinger, Peter; Bregant, Marco; Broker, Theo Alexander; Browning, Tyler Allen; Broz, Michal; Brucken, Erik Jens; Bruna, Elena; Bruno, Giuseppe Eugenio; Budnikov, Dmitry; Buesching, Henner; Bufalino, Stefania; Buhler, Paul; Iga Buitron, Sergio Arturo; Buncic, Predrag; Busch, Oliver; Buthelezi, Edith Zinhle; Bashir Butt, Jamila; Buxton, Jesse Thomas; Cabala, Jan; Caffarri, Davide; Caines, Helen Louise; Caliva, Alberto; Calvo Villar, Ernesto; Camerini, Paolo; Carena, Francesco; Carena, Wisla; Carnesecchi, Francesca; Castillo Castellanos, Javier Ernesto; Castro, Andrew John; Casula, Ester Anna Rita; Ceballos Sanchez, Cesar; Cepila, Jan; Cerello, Piergiorgio; Cerkala, Jakub; Chang, Beomsu; Chapeland, Sylvain; Chartier, Marielle; Charvet, Jean-luc Fernand; Chattopadhyay, Subhasis; Chattopadhyay, Sukalyan; Chauvin, Alex; Chelnokov, Volodymyr; Cherney, Michael Gerard; Cheshkov, Cvetan Valeriev; Cheynis, Brigitte; Chibante Barroso, Vasco Miguel; Dobrigkeit Chinellato, David; Cho, Soyeon; Chochula, Peter; Choi, Kyungeon; Chojnacki, Marek; Choudhury, Subikash; Christakoglou, Panagiotis; Christensen, Christian Holm; Christiansen, Peter; Chujo, Tatsuya; Chung, Suh-urk; Cicalo, Corrado; Cifarelli, Luisa; Cindolo, Federico; Cleymans, Jean Willy Andre; Colamaria, Fabio Filippo; Colella, Domenico; Collu, Alberto; Colocci, Manuel; Conesa Balbastre, Gustavo; Conesa Del Valle, Zaida; Connors, Megan Elizabeth; Contreras Nuno, Jesus Guillermo; Cormier, Thomas Michael; Corrales Morales, Yasser; Cortes Maldonado, Ismael; Cortese, Pietro; Cosentino, Mauro Rogerio; Costa, Filippo; Crkovska, Jana; Crochet, Philippe; Cruz Albino, Rigoberto; Cuautle Flores, Eleazar; Cunqueiro Mendez, Leticia; Dahms, Torsten; Dainese, Andrea; Danisch, Meike Charlotte; Danu, Andrea; Das, Debasish; Das, Indranil; Das, Supriya; Dash, Ajay Kumar; Dash, Sadhana; De, Sudipan; De Caro, Annalisa; De Cataldo, Giacinto; De Conti, Camila; De Cuveland, Jan; De Falco, Alessandro; De Gruttola, Daniele; De Marco, Nora; De Pasquale, Salvatore; Derradi De Souza, Rafael; Deisting, Alexander; Deloff, Andrzej; Deplano, Caterina; Dhankher, Preeti; Di Bari, Domenico; Di Mauro, Antonio; Di Nezza, Pasquale; Di Ruzza, Benedetto; Diaz Corchero, Miguel Angel; Dietel, Thomas; Dillenseger, Pascal; Divia, Roberto; Djuvsland, Oeystein; Dobrin, Alexandru Florin; Domenicis Gimenez, Diogenes; Donigus, Benjamin; Dordic, Olja; Drozhzhova, Tatiana; Dubey, Anand Kumar; Dubla, Andrea; Ducroux, Laurent; Duggal, Ashpreet Kaur; Dupieux, Pascal; Ehlers Iii, Raymond James; Elia, Domenico; Endress, Eric; Engel, Heiko; Epple, Eliane; Erazmus, Barbara Ewa; Erhardt, Filip; Espagnon, Bruno; Esumi, Shinichi; Eulisse, Giulio; Eum, Jongsik; Evans, David; Evdokimov, Sergey; Eyyubova, Gyulnara; Fabbietti, Laura; Fabris, Daniela; Faivre, Julien; Fantoni, Alessandra; Fasel, Markus; Feldkamp, Linus; Feliciello, Alessandro; Feofilov, Grigorii; Ferencei, Jozef; Fernandez Tellez, Arturo; Gonzalez Ferreiro, Elena; Ferretti, Alessandro; Festanti, Andrea; Feuillard, Victor Jose Gaston; Figiel, Jan; Araujo Silva Figueredo, Marcel; Filchagin, Sergey; Finogeev, Dmitry; Fionda, Fiorella; Fiore, Enrichetta Maria; Floris, Michele; Foertsch, Siegfried Valentin; Foka, Panagiota; Fokin, Sergey; Fragiacomo, Enrico; Francescon, Andrea; Francisco, Audrey; Frankenfeld, Ulrich Michael; Fronze, Gabriele Gaetano; Fuchs, Ulrich; Furget, Christophe; Furs, Artur; Fusco Girard, Mario; Gaardhoeje, Jens Joergen; Gagliardi, Martino; Gago Medina, Alberto Martin; Gajdosova, Katarina; Gallio, Mauro; Duarte Galvan, Carlos; Gangadharan, Dhevan Raja; Ganoti, Paraskevi; Gao, Chaosong; Garabatos Cuadrado, Jose; Garcia-solis, Edmundo Javier; Garg, Kunal; Garg, Prakhar; Gargiulo, Corrado; Gasik, Piotr Jan; Gauger, Erin Frances; De Leone Gay, Maria Beatriz; Germain, Marie; Ghosh, Premomoy; Ghosh, Sanjay Kumar; Gianotti, Paola; Giubellino, Paolo; Giubilato, Piero; Gladysz-dziadus, Ewa; Glassel, Peter; Gomez Coral, Diego Mauricio; Gomez Ramirez, Andres; Sanchez Gonzalez, Andres; Gonzalez, Victor; Gonzalez Zamora, Pedro; Gorbunov, Sergey; Gorlich, Lidia Maria; Gotovac, Sven; Grabski, Varlen; Graczykowski, Lukasz Kamil; Graham, Katie Leanne; Greiner, Leo Clifford; Grelli, Alessandro; Grigoras, Costin; Grigoryev, Vladislav; Grigoryan, Ara; Grigoryan, Smbat; Grion, Nevio; Gronefeld, Julius Maximilian; Grosse-oetringhaus, Jan Fiete; Grosso, Raffaele; Gruber, Lukas; Guber, Fedor; Guernane, Rachid; Guerzoni, Barbara; Gulbrandsen, Kristjan Herlache; Gunji, Taku; Gupta, Anik; Gupta, Ramni; Bautista Guzman, Irais; Haake, Rudiger; Hadjidakis, Cynthia Marie; Hamagaki, Hideki; Hamar, Gergoe; Hamon, Julien Charles; Harris, John William; Harton, Austin Vincent; Hatzifotiadou, Despina; Hayashi, Shinichi; Heckel, Stefan Thomas; Hellbar, Ernst; Helstrup, Haavard; Herghelegiu, Andrei Ionut; Herrera Corral, Gerardo Antonio; Herrmann, Florian; Hess, Benjamin Andreas; Hetland, Kristin Fanebust; Hillemanns, Hartmut; Hippolyte, Boris; Hladky, Jan; Horak, David; Hosokawa, Ritsuya; Hristov, Peter Zahariev; Hughes, Charles; Humanic, Thomas; Hussain, Nur; Hussain, Tahir; Hutter, Dirk; Hwang, Dae Sung; Ilkaev, Radiy; Inaba, Motoi; Ippolitov, Mikhail; Irfan, Muhammad; Isakov, Vladimir; Islam, Md Samsul; Ivanov, Marian; Ivanov, Vladimir; Izucheev, Vladimir; Jacak, Barbara; Jacazio, Nicolo; Jacobs, Peter Martin; Jadhav, Manoj Bhanudas; Jadlovska, Slavka; Jadlovsky, Jan; Jahnke, Cristiane; Jakubowska, Monika Joanna; Janik, Malgorzata Anna; Pahula Hewage, Sandun; Jena, Chitrasen; Jena, Satyajit; Jimenez Bustamante, Raul Tonatiuh; Jones, Peter Graham; Jusko, Anton; Kalinak, Peter; Kalweit, Alexander Philipp; Kang, Ju Hwan; Kaplin, Vladimir; Kar, Somnath; Karasu Uysal, Ayben; Karavichev, Oleg; Karavicheva, Tatiana; Karayan, Lilit; Karpechev, Evgeny; Kebschull, Udo Wolfgang; Keidel, Ralf; Keijdener, Darius Laurens; Keil, Markus; Khan, Mohammed Mohisin; Khan, Palash; Khan, Shuaib Ahmad; Khanzadeev, Alexei; Kharlov, Yury; Khatun, Anisa; Khuntia, Arvind; Kileng, Bjarte; Kim, Do Won; Kim, Dong Jo; Kim, Daehyeok; Kim, Hyeonjoong; Kim, Jinsook; Kim, Jiyoung; Kim, Minjung; Kim, Minwoo; Kim, Se Yong; Kim, Taesoo; Kirsch, Stefan; Kisel, Ivan; Kiselev, Sergey; Kisiel, Adam Ryszard; Kiss, Gabor; Klay, Jennifer Lynn; Klein, Carsten; Klein, Jochen; Klein-boesing, Christian; Klewin, Sebastian; Kluge, Alexander; Knichel, Michael Linus; Knospe, Anders Garritt; Kobdaj, Chinorat; Kofarago, Monika; Kollegger, Thorsten; Kolozhvari, Anatoly; Kondratev, Valerii; Kondratyeva, Natalia; Kondratyuk, Evgeny; Konevskikh, Artem; Kopcik, Michal; Kour, Mandeep; Kouzinopoulos, Charalampos; Kovalenko, Oleksandr; Kovalenko, Vladimir; Kowalski, Marek; Koyithatta Meethaleveedu, Greeshma; Kralik, Ivan; Kravcakova, Adela; Krivda, Marian; Krizek, Filip; Kryshen, Evgeny; Krzewicki, Mikolaj; Kubera, Andrew Michael; Kucera, Vit; Kuhn, Christian Claude; Kuijer, Paulus Gerardus; Kumar, Ajay; Kumar, Jitendra; Kumar, Lokesh; Kumar, Shyam; Kundu, Sourav; Kurashvili, Podist; Kurepin, Alexander; Kurepin, Alexey; Kuryakin, Alexey; Kushpil, Svetlana; Kweon, Min Jung; Kwon, Youngil; La Pointe, Sarah Louise; La Rocca, Paola; Lagana Fernandes, Caio; Lakomov, Igor; Langoy, Rune; Lapidus, Kirill; Lara Martinez, Camilo Ernesto; Lardeux, Antoine Xavier; Lattuca, Alessandra; Laudi, Elisa; Lazaridis, Lazaros; Lea, Ramona; Leardini, Lucia; Lee, Seongjoo; Lehas, Fatiha; Lehner, Sebastian; Lehrbach, Johannes; Lemmon, Roy Crawford; Lenti, Vito; Leogrande, Emilia; Leon Monzon, Ildefonso; Levai, Peter; Li, Shuang; Li, Xiaomei; Lien, Jorgen Andre; Lietava, Roman; Lindal, Svein; Lindenstruth, Volker; Lippmann, Christian; Lisa, Michael Annan; Ljunggren, Hans Martin; Llope, William; Lodato, Davide Francesco; Lonne, Per-ivar; Loginov, Vitaly; Loizides, Constantinos; Lopez, Xavier Bernard; Lopez Torres, Ernesto; Lowe, Andrew John; Luettig, Philipp Johannes; Lunardon, Marcello; Luparello, Grazia; Lupi, Matteo; Lutz, Tyler Harrison; Maevskaya, Alla; Mager, Magnus; Mahajan, Sanjay; Mahmood, Sohail Musa; Maire, Antonin; Majka, Richard Daniel; Malaev, Mikhail; Maldonado Cervantes, Ivonne Alicia; Malinina, Liudmila; Mal'kevich, Dmitry; Malzacher, Peter; Mamonov, Alexander; Manko, Vladislav; Manso, Franck; Manzari, Vito; Mao, Yaxian; Marchisone, Massimiliano; Mares, Jiri; Margagliotti, Giacomo Vito; Margotti, Anselmo; Margutti, Jacopo; Marin, Ana Maria; Markert, Christina; Marquard, Marco; Martin, Nicole Alice; Martinengo, Paolo; Martinez Hernandez, Mario Ivan; Martinez-garcia, Gines; Martinez Pedreira, Miguel; Mas, Alexis Jean-michel; Masciocchi, Silvia; Masera, Massimo; Masoni, Alberto; Mastroserio, Annalisa; Matyja, Adam Tomasz; Mayer, Christoph; Mazer, Joel Anthony; Mazzilli, Marianna; Mazzoni, Alessandra Maria; Meddi, Franco; Melikyan, Yuri; Menchaca-rocha, Arturo Alejandro; Meninno, Elisa; Mercado-perez, Jorge; Meres, Michal; Mhlanga, Sibaliso; Miake, Yasuo; Mieskolainen, Matti Mikael; Mikhaylov, Konstantin; Milano, Leonardo; Milosevic, Jovan; Mischke, Andre; Mishra, Aditya Nath; Mishra, Tribeni; Miskowiec, Dariusz Czeslaw; Mitra, Jubin; Mitu, Ciprian Mihai; Mohammadi, Naghmeh; Mohanty, Bedangadas; Molnar, Levente; Montes Prado, Esther; Moreira De Godoy, Denise Aparecida; Perez Moreno, Luis Alberto; Moretto, Sandra; Morreale, Astrid; Morsch, Andreas; Muccifora, Valeria; Mudnic, Eugen; Muhlheim, Daniel Michael; Muhuri, Sanjib; Mukherjee, Maitreyee; Mulligan, James Declan; Gameiro Munhoz, Marcelo; Munning, Konstantin; Munzer, Robert Helmut; Murakami, Hikari; Murray, Sean; Musa, Luciano; Musinsky, Jan; Myers, Corey James; Naik, Bharati; Nair, Rahul; Nandi, Basanta Kumar; Nania, Rosario; Nappi, Eugenio; Naru, Muhammad Umair; Ferreira Natal Da Luz, Pedro Hugo; Nattrass, Christine; Rosado Navarro, Sebastian; Nayak, Kishora; Nayak, Ranjit; Nayak, Tapan Kumar; Nazarenko, Sergey; Nedosekin, Alexander; Negrao De Oliveira, Renato Aparecido; Nellen, Lukas; Ng, Fabian; Nicassio, Maria; Niculescu, Mihai; Niedziela, Jeremi; Nielsen, Borge Svane; Nikolaev, Sergey; Nikulin, Sergey; Nikulin, Vladimir; Noferini, Francesco; Nomokonov, Petr; Nooren, Gerardus; Cabanillas Noris, Juan Carlos; Norman, Jaime; Nyanin, Alexander; Nystrand, Joakim Ingemar; Oeschler, Helmut Oskar; Oh, Saehanseul; Ohlson, Alice Elisabeth; Okubo, Tsubasa; Olah, Laszlo; Oleniacz, Janusz; Oliveira Da Silva, Antonio Carlos; Oliver, Michael Henry; Onderwaater, Jacobus; Oppedisano, Chiara; Orava, Risto; Oravec, Matej; Ortiz Velasquez, Antonio; Oskarsson, Anders Nils Erik; Otwinowski, Jacek Tomasz; Oyama, Ken; Ozdemir, Mahmut; Pachmayer, Yvonne Chiara; Pacik, Vojtech; Pagano, Davide; Pagano, Paola; Paic, Guy; Pal, Susanta Kumar; Palni, Prabhakar; Pan, Jinjin; Pandey, Ashutosh Kumar; Papikyan, Vardanush; Pappalardo, Giuseppe; Pareek, Pooja; Park, Jonghan; Park, Woojin; Parmar, Sonia; Passfeld, Annika; Paticchio, Vincenzo; Patra, Rajendra Nath; Paul, Biswarup; Pei, Hua; Peitzmann, Thomas; Peng, Xinye; Pereira Da Costa, Hugo Denis Antonio; Peresunko, Dmitry Yurevich; Perez Lezama, Edgar; Peskov, Vladimir; Pestov, Yury; Petracek, Vojtech; Petrov, Viacheslav; Petrovici, Mihai; Petta, Catia; Piano, Stefano; Pikna, Miroslav; Pillot, Philippe; Ozelin De Lima Pimentel, Lais; Pinazza, Ombretta; Pinsky, Lawrence; Piyarathna, Danthasinghe; Ploskon, Mateusz Andrzej; Planinic, Mirko; Pluta, Jan Marian; Pochybova, Sona; Podesta Lerma, Pedro Luis Manuel; Poghosyan, Martin; Polishchuk, Boris; Poljak, Nikola; Poonsawat, Wanchaloem; Pop, Amalia; Poppenborg, Hendrik; Porteboeuf, Sarah Julie; Porter, R Jefferson; Pospisil, Jan; Pozdniakov, Valeriy; Prasad, Sidharth Kumar; Preghenella, Roberto; Prino, Francesco; Pruneau, Claude Andre; Pshenichnov, Igor; Puccio, Maximiliano; Puddu, Giovanna; Pujahari, Prabhat Ranjan; Punin, Valery; Putschke, Jorn Henning; Qvigstad, Henrik; Rachevski, Alexandre; Raha, Sibaji; Rajput, Sonia; Rak, Jan; Rakotozafindrabe, Andry Malala; Ramello, Luciano; Rami, Fouad; Rana, Dhan Bahadur; Raniwala, Rashmi; Raniwala, Sudhir; Rasanen, Sami Sakari; Rascanu, Bogdan Theodor; Rathee, Deepika; Ratza, Viktor; Ravasenga, Ivan; Read, Kenneth Francis; Redlich, Krzysztof; Rehman, Attiq Ur; Reichelt, Patrick Simon; Reidt, Felix; Ren, Xiaowen; Renfordt, Rainer Arno Ernst; Reolon, Anna Rita; Reshetin, Andrey; Reygers, Klaus Johannes; Riabov, Viktor; Ricci, Renato Angelo; Richert, Tuva Ora Herenui; Richter, Matthias Rudolph; Riedler, Petra; Riegler, Werner; Riggi, Francesco; Ristea, Catalin-lucian; Rodriguez Cahuantzi, Mario; Roeed, Ketil; Rogochaya, Elena; Rohr, David Michael; Roehrich, Dieter; Ronchetti, Federico; Ronflette, Lucile; Rosnet, Philippe; Rossi, Andrea; Roukoutakis, Filimon; Roy, Ankhi; Roy, Christelle Sophie; Roy, Pradip Kumar; Rubio Montero, Antonio Juan; Rui, Rinaldo; Russo, Riccardo; Ryabinkin, Evgeny; Ryabov, Yury; Rybicki, Andrzej; Saarinen, Sampo; Sadhu, Samrangy; Sadovskiy, Sergey; Safarik, Karel; Sahlmuller, Baldo; Sahoo, Baidyanath; Sahoo, Pragati; Sahoo, Raghunath; Sahoo, Sarita; Sahu, Pradip Kumar; Saini, Jogender; Sakai, Shingo; Saleh, Mohammad Ahmad; Salzwedel, Jai Samuel Nielsen; Sambyal, Sanjeev Singh; Samsonov, Vladimir; Sandoval, Andres; Sano, Masato; Sarkar, Debojit; Sarkar, Nachiketa; Sarma, Pranjal; Sas, Mike Henry Petrus; Scapparone, Eugenio; Scarlassara, Fernando; Scharenberg, Rolf Paul; Schiaua, Claudiu Cornel; Schicker, Rainer Martin; Schmidt, Christian Joachim; Schmidt, Hans Rudolf; Schmidt, Martin; Schukraft, Jurgen; Schutz, Yves Roland; Schwarz, Kilian Eberhard; Schweda, Kai Oliver; Scioli, Gilda; Scomparin, Enrico; Scott, Rebecca Michelle; Sefcik, Michal; Seger, Janet Elizabeth; Sekiguchi, Yuko; Sekihata, Daiki; Selyuzhenkov, Ilya; Senosi, Kgotlaesele; Senyukov, Serhiy; Serradilla Rodriguez, Eulogio; Sett, Priyanka; Sevcenco, Adrian; Shabanov, Arseniy; Shabetai, Alexandre; Shadura, Oksana; Shahoyan, Ruben; Shangaraev, Artem; Sharma, Ankita; Sharma, Anjali; Sharma, Mona; Sharma, Monika; Sharma, Natasha; Sheikh, Ashik Ikbal; Shigaki, Kenta; Shou, Qiye; Shtejer Diaz, Katherin; Sibiryak, Yury; Siddhanta, Sabyasachi; Sielewicz, Krzysztof Marek; Siemiarczuk, Teodor; Silvermyr, David Olle Rickard; Silvestre, Catherine Micaela; Simatovic, Goran; Simonetti, Giuseppe; Singaraju, Rama Narayana; Singh, Ranbir; Singhal, Vikas; Sarkar - Sinha, Tinku; Sitar, Branislav; Sitta, Mario; Skaali, Bernhard; Slupecki, Maciej; Smirnov, Nikolai; Snellings, Raimond; Snellman, Tomas Wilhelm; Song, Jihye; Song, Myunggeun; Song, Zixuan; Soramel, Francesca; Sorensen, Soren Pontoppidan; Sozzi, Federica; Spiriti, Eleuterio; Sputowska, Iwona Anna; Srivastava, Brijesh Kumar; Stachel, Johanna; Stan, Ionel; Stankus, Paul; Stenlund, Evert Anders; Steyn, Gideon Francois; Stiller, Johannes Hendrik; Stocco, Diego; Strmen, Peter; Alarcon Do Passo Suaide, Alexandre; Sugitate, Toru; Suire, Christophe Pierre; Suleymanov, Mais Kazim Oglu; Suljic, Miljenko; Sultanov, Rishat; Sumbera, Michal; Sumowidagdo, Suharyo; Suzuki, Ken; Swain, Sagarika; Szabo, Alexander; Szarka, Imrich; Szczepankiewicz, Adam; Szymanski, Maciej Pawel; Tabassam, Uzma; Takahashi, Jun; Tambave, Ganesh Jagannath; Tanaka, Naoto; Tarhini, Mohamad; Tariq, Mohammad; Tarzila, Madalina-gabriela; Tauro, Arturo; Tejeda Munoz, Guillermo; Telesca, Adriana; Terasaki, Kohei; Terrevoli, Cristina; Teyssier, Boris; Thakur, Dhananjaya; Thomas, Deepa; Tieulent, Raphael Noel; Tikhonov, Anatoly; Timmins, Anthony Robert; Toia, Alberica; Tripathy, Sushanta; Trogolo, Stefano; Trombetta, Giuseppe; Trubnikov, Victor; Trzaska, Wladyslaw Henryk; Tsuji, Tomoya; Tumkin, Alexandr; Turrisi, Rosario; Tveter, Trine Spedstad; Ullaland, Kjetil; Umaka, Ejiro Naomi; Uras, Antonio; Usai, Gianluca; Utrobicic, Antonija; Vala, Martin; Van Der Maarel, Jasper; Van Hoorne, Jacobus Willem; Van Leeuwen, Marco; Vanat, Tomas; Vande Vyvre, Pierre; Varga, Dezso; Diozcora Vargas Trevino, Aurora; Vargyas, Marton; Varma, Raghava; Vasileiou, Maria; Vasiliev, Andrey; Vauthier, Astrid; Vazquez Doce, Oton; Vechernin, Vladimir; Veen, Annelies Marianne; Velure, Arild; Vercellin, Ermanno; Vergara Limon, Sergio; Vernet, Renaud; Vertesi, Robert; Vickovic, Linda; Vigolo, Sonia; Viinikainen, Jussi Samuli; Vilakazi, Zabulon; Villalobos Baillie, Orlando; Villatoro Tello, Abraham; Vinogradov, Alexander; Vinogradov, Leonid; Virgili, Tiziano; Vislavicius, Vytautas; Vodopyanov, Alexander; Volkl, Martin Andreas; Voloshin, Kirill; Voloshin, Sergey; Volpe, Giacomo; Von Haller, Barthelemy; Vorobyev, Ivan; Voscek, Dominik; Vranic, Danilo; Vrlakova, Janka; Wagner, Boris; Wagner, Jan; Wang, Hongkai; Wang, Mengliang; Watanabe, Daisuke; Watanabe, Yosuke; Weber, Michael; Weber, Steffen Georg; Weiser, Dennis Franz; Wessels, Johannes Peter; Westerhoff, Uwe; Whitehead, Andile Mothegi; Wiechula, Jens; Wikne, Jon; Wilk, Grzegorz Andrzej; Wilkinson, Jeremy John; Willems, Guido Alexander; Williams, Crispin; Windelband, Bernd Stefan; Winn, Michael Andreas; Witt, William Edward; Yalcin, Serpil; Yang, Ping; Yano, Satoshi; Yin, Zhongbao; Yokoyama, Hiroki; Yoo, In-kwon; Yoon, Jin Hee; Yurchenko, Volodymyr; Zaccolo, Valentina; Zaman, Ali; Zampolli, Chiara; Correia Zanoli, Henrique Jose; Zaporozhets, Sergey; Zardoshti, Nima; Zarochentsev, Andrey; Zavada, Petr; Zavyalov, Nikolay; Zbroszczyk, Hanna Paulina; Zhalov, Mikhail; Zhang, Haitao; Zhang, Xiaoming; Zhang, Yonghong; Chunhui, Zhang; Zhang, Zuman; Zhao, Chengxin; Zhigareva, Natalia; Zhou, Daicui; Zhou, You; Zhou, Zhuo; Zhu, Hongsheng; Zhu, Jianhui; Zichichi, Antonino; Zimmermann, Alice; Zimmermann, Markus Bernhard; Zinovjev, Gennady; Zmeskal, Johann

    2017-01-01

    Particle identification is an important feature of the ALICE detector at the LHC. In particular, for particle identification via the time-of-flight technique, the precise determination of the event collision time represents an important ingredient of the quality of the measurement. In this paper, the different methods used for such a measurement in ALICE by means of the T0 and the TOF detectors are reviewed. Efficiencies, resolution and the improvement of the particle identification separation power of the methods used are presented for the different LHC colliding systems (pp , p-Pb and Pb-Pb) during the first period of data taking of LHC (Run 1).

  6. Determination of the event collision time with the ALICE detector at the LHC

    CERN Document Server

    ALICE, CERN; The ALICE collaboration

    2016-01-01

    Particle identification is an important feature of the ALICE detector at the LHC. In particular, for particle identification via the time-of-flight technique, the precise determination of the event collision time represents an important ingredient of the quality of the measurement. In this paper, the different methods used for such a measurement in ALICE by means of the T0 and the TOF detectors are reviewed. Efficiencies, resolution and the improvement of the particle identification separation power of the methods used are presented for the different LHC colliding systems (pp, p–Pb and Pb–Pb) during the first period of data taking of LHC (R UN 1).

  7. Transport of platinum bonded nucleotides into proteoliposomes, mediated by Drosophila melanogaster thiamine pyrophosphate carrier protein (DmTpc1).

    Science.gov (United States)

    Carrisi, Chiara; Antonucci, Daniela; Lunetti, Paola; Migoni, Danilo; Girelli, Chiara R; Dolce, Vincenza; Fanizzi, Francesco P; Benedetti, Michele; Capobianco, Loredana

    2014-01-01

    The results of the present study suggest that DmTpc1 is actively implicated in the specific uptake of free cytoplasmic Pt bonded nucleotides, and therefore could be linked to the mechanism of action of some platinum-based antitumor drugs. Although DmTpc1 has a low affinity for model [Pt(dien)(N7-5'-dGTP)] and cis-[Pt(NH3)2(py)(N7-5'-dGTP)] compared to dATP it's well known that DNA platination level of few metal atoms per double-stranded molecule may account for the pharmacological activity of platinum based antitumor drugs. This is the first investigation where it has been demonstrated that a mitochondrial carrier is directly involved in the transport of metalated purines related with the cisplatin mechanism of action. Moreover it is shown as a lower hindrance of nucleotide bonded platinum complexes could strongly enhance mitochondrial uptake. Furthermore, a new application of ICP-AES addressed to measure the transport of metalated nucleobases, by using a recombinant protein reconstituted into liposomes, has been here, for the first time, developed and compared with a standard technique such as the liquid scintillation counting.

  8. Search for anomalies in the neutrino sector with muon spectrometers and large LArTPC imaging detectors at CERN

    CERN Document Server

    Antonello, A; Baibussinov, B; Bilokon, H; Boffelli, F; Bonesini, M; Calligarich, E; Canci, N; Centro, S; Cesana, A; Cieslik, K; Cline, D B; Cocco, A G; Dequal, D; Dermenev, A; Dolfini, R; De Gerone, M; Dussoni, S; Farnese, C; Fava, A; Ferrari, A; Fiorillo, G; Garvey, G T; Gatti, F; Gibin, D; Gninenko, S; Guber, F; Guglielmi, A; Haranczyk, M; Holeczek, J; Ivashkin, A; Kirsanov, M; Kisiel, J; Kochanek, I; Kurepin, A; Lagoda, J; Lucchini, G; Louis, W C; Mania, S; Mannocchi, G; Marchini, S; Matveev, V; Menegolli, A; Meng, G; Mills, G B; Montanari, C; Nicoletto, M; Otwinowski, S; Palczewki, T J; Passardi, G; Perfetto, F; Picchi, P; Pietropaolo, F; Plonski, P; Rappoldi, A; Raselli, G L; Rossella, M; Rubbia, C; Sala, P; Scaramelli, A; Segreto, E; Stefan, D; Stepaniak, J; Sulej, R; Suvorova, O; Terrani, M; Tlisov, D; Van de Water, R G; Trinchero, G; Turcato, M; Varanini, F; Ventura, S; Vignoli, C; Wang, H G; Yang, X; Zani, A; Zaremba, K; Benettoni, M; Bernardini, P; Bertolin, A; Brugnera, R; Calabrese, M; Cecchetti, A; Cecchini, S; Collazuol, G; Creti, P; Corso, F Dal; Del Prete, A; De Mitri, I; De Robertis, G; De Serio, M; Esposti, L Degli; Di Ferdinando, D; Dore, U; Dusini, S; Fabbricatore, P; Fanin, C; Fini, R A; Fiore, G; Garfagnini, A; Giacomelli, G; Giacomelli, R; Guandalini, C; Guerzoni, M; Kose, U; Laurenti, G; Laveder, M; Lippi, I; Loddo, F; Longhin, A; Loverre, P; Mancarella, G; Mandrioli, G; Margiotta, A; Marsella, G; Mauri, N; Medinaceli, E; Mengucci, A; Mezzetto, M; Michinelli, R; Muciaccia, M T; Orecchini, D; Paoloni, A; Papadia, G; Pastore, A; Patrizii, L; Pozzato, M; Rosa, G; Sahnounm, Z; Simone, S; Sioli, M; Sirri, G; Spurio, M; Stanco, L; Surdo, A; Tenti, M; Togo, V; Ventura, M; Zago, M

    2012-01-01

    A new experiment with an intense ~2 GeV neutrino beam at CERN SPS is proposed in order to definitely clarify the possible existence of additional neutrino states, as pointed out by neutrino calibration source experiments, reactor and accelerator experiments and measure the corresponding oscillation parameters. The experiment is based on two identical LAr-TPCs complemented by magnetized spectrometers detecting electron and muon neutrino events at Far and Near positions, 1600 m and 300 m from the proton target, respectively. The ICARUS T600 detector, the largest LAr-TPC ever built with a size of about 600 ton of imaging mass, now running in the LNGS underground laboratory, will be moved at the CERN Far position. An additional 1/4 of the T600 detector (T150) will be constructed and located in the Near position. Two large area spectrometers will be placed downstream of the two LAr-TPC detectors to perform charge identification and muon momentum measurements from sub-GeV to several GeV energy range, greatly comple...

  9. First results of a large-area cryogenic gaseous photomultiplier coupled to a dual-phase liquid xenon TPC

    CERN Document Server

    Arazi, L; Erdal, E; Israelashvili, I; Rappaport, M L; Shchemelinin, S; Vartsky, D; Santos, J M F dos; Breskin, A

    2015-01-01

    We discuss recent advances in the development of cryogenic gaseous photomultipliers (GPM), for possible use in dark matter and other rare-event searches using noble-liquid targets. We present results from a 10 cm diameter GPM coupled to a dual-phase liquid xenon (LXe) TPC, demonstrating - for the first time - the feasibility of recording both primary ("S1") and secondary ("S2") scintillation signals. The detector comprised a triple Thick Gas Electron Multiplier (THGEM) structure with cesium iodide photocathode on the first element; it was shown to operate stably at 180 K with gains above 10^5, providing high single-photon detection efficiency even in the presence of large alpha particle-induced S2 signals comprising thousands of photoelectrons. S1 scintillation signals were recorded with a time resolution of 1.2 ns (RMS). The energy resolution ({\\sigma}/E) for S2 electroluminescence of 5.5 MeV alpha particles was ~9%, which is comparable to that obtained in the XENON100 TPC with PMTs. The results are discusse...

  10. TREX-DM: a low-background Micromegas-based TPC for low-mass WIMP detection

    Energy Technology Data Exchange (ETDEWEB)

    Iguaz, F.J.; Garza, J.G.; Castel, J.F.; Cebrian, S.; Dafni, T.; Garcia, J.A.; Irastorza, I.G.; Lagraba, A.; Luzon, G.; Peiro, A. [Universidad de Zaragoza, Grupo de Fisica Nuclear y Astroparticulas, Zaragoza (Spain); Aznar, F. [Universidad de Zaragoza, Grupo de Fisica Nuclear y Astroparticulas, Zaragoza (Spain); Universidad de Zaragoza, Centro Universitario de la Defensa, Zaragoza (Spain)

    2016-10-15

    If Dark Matter is made of Weakly Interacting Massive Particles (WIMPs) with masses below ∝20 GeV, the corresponding nuclear recoils in mainstream WIMP experiments are of energies too close, or below, the experimental threshold. Gas Time Projection Chambers (TPCs) can be operated with a variety of target elements, offer good tracking capabilities and, on account of the amplification in gas, very low thresholds are achievable. Recent advances in electronics and in novel radiopure TPC readouts, especially micro-mesh gas structure (Micromegas), are improving the scalability and low-background prospects of gaseous TPCs. Here we present TREX-DM, a prototype to test the concept of a Micromegas-based TPC to search for low-mass WIMPs. The detector is designed to host an active mass of ∝0.300 kg of Ar at 10 bar, or alternatively ∝0.160 kg of Ne at 10 bar, with an energy threshold below 0.4 keVee, and is fully built with radiopure materials. We will describe the detector in detail, the results from the commissioning phase on surface, as well as a preliminary background model. The anticipated sensitivity of this technique may go beyond current experimental limits for WIMPs of masses of 2-8 GeV. (orig.)

  11. TREX-DM: a low-background Micromegas-based TPC for low-mass WIMP detection

    Science.gov (United States)

    Iguaz, F. J.; Garza, J. G.; Aznar, F.; Castel, J. F.; Cebrián, S.; Dafni, T.; García, J. A.; Irastorza, I. G.; Lagraba, A.; Luzón, G.; Peiró, A.

    2016-10-01

    If Dark Matter is made of Weakly Interacting Massive Particles (WIMPs) with masses below {˜ }20 GeV, the corresponding nuclear recoils in mainstream WIMP experiments are of energies too close, or below, the experimental threshold. Gas Time Projection Chambers (TPCs) can be operated with a variety of target elements, offer good tracking capabilities and, on account of the amplification in gas, very low thresholds are achievable. Recent advances in electronics and in novel radiopure TPC readouts, especially micro-mesh gas structure (Micromegas), are improving the scalability and low-background prospects of gaseous TPCs. Here we present TREX-DM, a prototype to test the concept of a Micromegas-based TPC to search for low-mass WIMPs. The detector is designed to host an active mass of {˜ }0.300 kg of Ar at 10 bar, or alternatively {˜ }0.160 kg of Ne at 10 bar, with an energy threshold below 0.4 keVee, and is fully built with radiopure materials. We will describe the detector in detail, the results from the commissioning phase on surface, as well as a preliminary background model. The anticipated sensitivity of this technique may go beyond current experimental limits for WIMPs of masses of 2-8 GeV.

  12. The WA105-3x1x1 m3 dual phase LAr-TPC demonstrator

    CERN Document Server

    Murphy, Sebastien

    2016-01-01

    The dual phase Liquid Argon Time Projection Chamber (LAr TPC) is the state-of-art technology for neutrino detection thanks to its superb 3D tracking and calorimetry performance. Its main feature is the charge amplification in gas argon which provides excellent signal-to-noise ratio. Electrons produced in the liquid argon are extracted in the gas phase. Here, a readout plane based on Large Electron Multiplier detectors provides amplification of the charges before its collection onto an anode with strip readout. The charge amplification enables constructing fully homoge- nous giant LAr-TPCs with tuneable gain, excellent charge imaging performance and increased sensitivity to low energy events. Following a staged approach the WA105 collaboration is con- structing a dual phase LAr-TPC with an active volume of 3x1x1m3 that will soon be tested with cosmic rays. Its construction and operation aims to test scalable solutions for the crucial aspects of this technology: ultra high argon purity in non-evacuable tank, la...

  13. Measurement of 1.7 to 74 MeV polarised gamma rays with the HARPO TPC

    CERN Document Server

    Geerebaert, Y; Amano, S; Attié, D; Bernard, D; Bruel, P; Calvet, D; Colas, P; Daté, S; Delbart, A; Frotin, M; Giebels, B; Götz, D; Hashimoto, S; Horan, D; Kotaka, T; Louzir, M; Minamiyama, Y; Miyamoto, S; Ohkuma, H; Poilleux, P; Semeniouk, I; Sizun, P; Takemoto, A; Yamaguchi, M; Wang, S

    2016-01-01

    Current {\\gamma}-ray telescopes based on photon conversions to electron-positron pairs, such as Fermi, use tungsten converters. They suffer of limited angular resolution at low energies, and their sensitivity drops below 1 GeV. The low multiple scattering in a gaseous detector gives access to higher angular resolution in the MeV-GeV range, and to the linear polarisation of the photons through the azimuthal angle of the electron-positron pair. HARPO is an R&D program to characterise the operation of a TPC (Time Projection Chamber) as a high angular-resolution and sensitivity telescope and polarimeter for {\\gamma} rays from cosmic sources. It represents a first step towards a future space instrument. A 30 cm cubic TPC demonstrator was built, and filled with 2 bar argon-based gas. It was put in a polarised {\\gamma}-ray beam at the NewSUBARU accelerator in Japan in November 2014. Data were taken at different photon energies from 1.7 MeV to 74 MeV, and with different polarisation configurations. The electronic...

  14. Optical Readout Time Projection Chamber (O-TPC) for a Study of Oxygen Formation In Stellar Helium Burning

    CERN Document Server

    Gai, M; Chechik, R; Dangendorf, V; Weller, H R; Gai, Moshe; Breskin, Amos; Chechik, Rachel; Dangendorf, Volker; Weller, Henry R.

    2005-01-01

    We are developing an Optical Readout Time Projection Chamber (O-TPC) detector for the study of the 12C(a,g)16O reaction that determines the ratio of carbon to oxygen in helium burning. This ratio is crucial for understanding the final fate of a progenitor star and the nucleosynthesis of elements prior to a Type II supernova; an oxygen rich star is predicted to collapse to a black hole, and a carbon rich star to a neutron star. Type Ia supernovae (SNeIa) are used as standard candles for measuring cosmological distances with the use of an empirical light curve-luminosity stretching factor. It is essential to understand helium burning that yields the carbon/oxygen white dwarf and thus the initial stage of SNeIa. The O-TPC is intended for use with high intensity photon beams extracted from the HIgS/TUNL facility at Duke University to study the 16O(g,a)12C reaction, and thus the direct reaction at energies as low as 0.7 MeV. We are conducting a systematical study of the best oxygen containing gas with light emitti...

  15. 2nd February 2011-Vice-Chancellor of Jammu University-Prof. Varun Sahni-India visiting ALICE cavern and LHC Tunnel

    CERN Multimedia

    Sylvain Chapeland

    2011-01-01

    Photo 1-2,4-8:The delegation visiting the ATLAS cavern Photo 3:ALICE Collaboration Spokesperson P. Giubellino+ALICE Collaboration University of Jammu S. Mahajan+ALICE Collaboration University of Jammu A. Bhasin+ALICE Collaboration Universita degli Studi di Torino R. Bala+V. Sahni+Adviser for India R.Voss+S. Arriaga+ALICE Collaboration University of Jammu A. Gupta Photo 9-13:The delegation visiting the LHC tunnel at Point 2 Photo 14-22: Signature of the Guest Book with R. Voss

  16. HARPO: beam characterization of a TPC for gamma-ray polarimetry and high angular-resolution astronomy in the MeV-GeV range

    CERN Document Server

    Wang, Shaobo; Bruel, Philippe; Frotin, Mickael; Geerebaert, Yannick; Giebels, Berrie; Gros, Philippe; Horan, Deirdre; Louzir, Marc; Poilleux, Patrick; Semeniouk, Igor; Attié, David; Calvet, Denis; Colas, Paul; Delbart, Alain; Sizun, Patrick; Götz, Diego; Amano, Sho; Kotaka, Takuya; Hashimoto, Satoshi; Minamiyama, Yasuhito; Takemoto, Akinori; Yamaguchi, Masashi; Miyamoto, Shuji; Daté, Schin; Ohkuma, Haruo

    2015-01-01

    A time projection chamber (TPC) can be used to measure the polarization of gamma rays with excellent angular precision and sensitivity in the MeV-GeV energy range through the conversion of photons to e+e- pairs. The Hermetic ARgon POlarimeter (HARPO) prototype was built to demonstrate this concept. It was recently tested in the polarized photon beam at the NewSUBARU facility in Japan. We present this data-taking run, which demonstrated the excellent performance of the HARPO TPC.

  17. Trigger system study of the dimuon spectrometer in the ALICE experiment at CERN-LHC; Etude du systeme de declenchement du spectrometre dimuons de l'experience alice au Cern-LHC

    Energy Technology Data Exchange (ETDEWEB)

    Roig, O

    1999-12-01

    This work is a contribution to the study of nucleus-nucleus collisions at the LHC with ALICE. The aim of this experiment is to search for a new phase of matter, the quark-gluon plasma (QGP). The dimuon forward spectrometer should measure one of the most promising probes of the QGP, the production of heavy quark vector mesons (J/{psi}, {gamma}, {gamma}', {gamma}'') through their muonic decays. The dimuon trigger selects the interesting events performing a cut on the transverse momentum of the tracks. The trigger decision is taken by a dedicated electronics using RPC (''Resistive Plate Chambers'') detector information. We have made our own R and D program on the RPC detector with various beam tests. We show the performances obtained during these tests of a low resistivity RPC operating in streamer mode. The ALICE requirements concerning the rate capability, the cluster size and the time resolution are fulfilled. We have optimised the trigger with simulations which include a complete description of the read-out planes and the trigger logic (algorithm). In particular, a technique of clustering is proposed and validated. A method called ''Ds reduction'' is introduced in order to limit the effects of combinatorial background on the trigger rates. The efficiencies and the trigger rates are calculated for Pb-Pb, Ca-Ca, p-p collisions at the LHC. Other more sophisticated cuts, on the invariant mass for example, using again the RPC information have been simulated but have not shown significant improvements of the trigger rates. (author)

  18. Modification of K{sup 0}{sub s} and Λ(anti Λ) transverse momentum spectra in Pb-Pb collisions at √(s{sub NN})=2.76 TeV with ALICE

    Energy Technology Data Exchange (ETDEWEB)

    Schuchmann, Simone

    2015-07-22

    Measurements of the transverse momentum (p{sub T}) spectra of K{sup 0}{sub s} and Λ(anti Λ) in Pb-Pb and pp collisions at √(s{sub NN})=2.76 TeV with the ALICE detector at the LHC at CERN up to p{sub T}=20 GeV/c and p{sub T}=16 GeV/c, respectively, are presented in this thesis. In addition, the particle rapidity densities at mid-rapidity and nuclear modification factors of K{sup 0}{sub s} and Λ(anti Λ) are shown and discussed. The analysis was performed using the Pb-Pb data set from 2010 and the pp data set from 2011. For the identification of K{sup 0}{sub s} and Λ(anti Λ), the on-the-fly V0 finder was employed on tracking information from the TPC and ITS detectors. The Λ and anti Λ spectra were feed-down corrected using the measured published Ξ{sup -} spectra as input. Regarding the rapidity density at mid-rapidity, a suppression of the strange particle production in pp as compared to Pb-Pb collisions is observed at all centralities, whereas the production per pion rapidity density stays constant as a function of dN{sub ch}/dη including both systems. Furthermore, the relative increase of the individual particle species in pp and AA collisions is compatible for non- and single-strange particles when going from RHIC (√(s{sub NN})=0.2 TeV) to LHC energies. On the other hand, in case of multi-strange baryons, a stronger increase in the particle production in pp is seen. The anti Λ and Λ production in Pb-Pb and pp collisions was found to be equal. Concerning the nuclear modification factors, at lower p{sub T}(p{sub T}<5 GeV/c), an enhancement of the R{sub AA} of Λ with respect to that of K{sup 0}{sub s} and charged hadrons is observed. This baryon-to-meson enhancement appearing in central Pb-Pb collisions at RHIC and LHC is currently explained by the interplay of the radial flow and recombination as the dominant particle production mechanism in this p{sub T} sector. The effect of radial flow is thus also seen in the low and intermediate p{sub T} region

  19. $J/\\psi$ production in proton-proton collisions at ALICE LHC

    CERN Document Server

    Kour, Ravjeet

    A Large Ion Collider Experiment (ALICE) studies the strong interaction part (Quantum Chromo Dynamics) of the Standard Model at the CERN Large Hadron Collider. ALICE has been designed as a general-purpose heavy-ion detector in order to explore phenomena of strong interacting matter and the quark-gluon plasma (QGP) at extreme values of energy density and temperature in nucleus-nucleus collisions. Results are presented here on the study of J/\\psiproduction in pp collisions at ALICE. In particular, a measurement of J/\\psi cross-section at \\sqrt{s} = 7 TeV energy has been performed, together with a study of a possible algorithm to separate primary J/\\psi from those coming from decays of B hadrons. The validity of this algorithm in ALICE has been demonstrated using Monte-Carlo samples. The J/\\psi particles have been searched exclusively in the decay channel J/\\psi -> e+e−. The study focused on what would be achievable in a period of early running, with integrated luminosity of L=1.25 nb-1, at a proton-proton cen...

  20. Proton-proton collisions at the Large Hadron Collider's ALICE Experiment: diffraction and high multiplicity

    CERN Document Server

    Matthews, Zoe Louise

    Diffraction in pp collisions contributes approximately 30 % of the inelastic cross section. Its influence on the pseudorapidity density is not well constrained at high energy. A method to estimate the contributing fractions of diffractive events to the inelastic cross section has been developed, and the fractions are measured in the ALICE detector at 900 GeV (7 TeV) to be f_D=0.278\\pm0.055 (f_D=0.28\\pm0.054) respectively. These results are compatible with recent ATLAS and ALICE measurements. Bjorken’s energy density relation suggests that, in high multiplicity pp collisions at the LHC, an environment comparable to A-A collisions at RHIC could be produced. Such events are of great interest to the ALICE Collaboration. Constraints on the running conditions have been established for obtaining a high multiplicity pp data sample using the ALICE detector’s multiplicity trigger. A model independent method to separate a multiplicity distribution from ‘pile-up’ contributions has been developed, and used in conn...