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Sample records for alice electromagnetic calorimeter

  1. The ALICE electromagnetic calorimeter high level triggers

    International Nuclear Information System (INIS)

    The ALICE (A Large Ion Collider Experiment) detector yields a huge sample of data from different sub-detectors. On-line data processing is applied to select and reduce the volume of the stored data. ALICE applies a multi-level hardware trigger scheme where fast detectors are used to feed a three-level (L0, L1, and L2) deep chain. The High-Level Trigger (HLT) is a fourth filtering stage sitting logically between the L2 trigger and the data acquisition event building. The EMCal detector comprises a large area electromagnetic calorimeter that extends the momentum measurement of photons and neutral mesons up to pT = 250 GeV/c, which improves the ALICE capability to perform jet reconstruction with measurement of the neutral energy component of jets. An online reconstruction and trigger chain has been developed within the HLT framework to sharpen the EMCal hardware triggers, by combining the central barrel tracking information with the shower reconstruction (clusters) in the calorimeter. In the present report the status and the functionality of the software components developed for the EMCal HLT online reconstruction and trigger chain will be discussed, as well as preliminary results from their commissioning performed during the 2011 LHC running period.

  2. Performance of prototypes for the ALICE electromagnetic calorimeter

    International Nuclear Information System (INIS)

    The performance of prototypes for the ALICE electromagnetic sampling calorimeter has been studied in test beam measurements at FNAL and CERN. A 4x4 array of final design modules showed an energy resolution of about 11%/√(E(GeV))+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 1.5mm+5.3mm/√(E(GeV)). For an electron identification efficiency of 90% a hadron rejection factor of >600 was obtained.

  3. Status and Performance of the ALICE/PHOS Electromagnetic Calorimeter

    CERN Document Server

    Ippolitov, Mikhail

    2008-01-01

    The PHOS is a high resolution electromagnetic calorimeter in the ALICE experiment at the LHC. The PHOS is dedicated for measurements of gammas and neutral mesons in a wide dynamic range with high energy and spatial resolutions. The PHOS is subdivided into 5 independent rectangular modules. The module is segmented into 3584 detection channels (64 × 56 matrix). Each channel consists of a 22 × 22 × 180 mm3 lead-tungstate crystal, coupled with 5 × 5 mm2 avalanche photo diode. The first PHOS module was assembled, commissioned and tested with 2 GeV/c electrons at CERN on the T10 PS secondary beam-line.

  4. 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.

  5. Characterization of avalanche photodiodes (APDs) for the electromagnetic calorimeter in the ALICE experiment

    International Nuclear Information System (INIS)

    The Electromagnetic Calorimeter (EMCal) of the ALICE experiment at LHC will extensively make use of avalanche photodiodes (APDs) for the readout of scintillation light. The large sensitive area, high quantum efficiency and low dark current make this type of photosensors well-suited for the EMCal requirements. A testing activity is currently in progress in order to characterize the main properties of these APDs and find the best working conditions. Fundamental tasks are the individual test of all APDs after presetting their nominal gain via the bias control and the study of APD gain coefficients as a function of the applied bias voltage and temperature. An overview of the adopted procedure will be presented, together with a description of preliminary results obtained on a first sample of APDs during the testing activity.

  6. Silicon pad detectors for ALICE forward calorimeter

    International Nuclear Information System (INIS)

    A newly designed Electromagnetic Calorimeter (EMC) is being proposed as a possible upgrade in the Forward rapidity region, to enhance the physics capabilities of the ALICE experiment at CERN. Each LHC experiment uses a unique approach, in which preference of the designers and the physics requirements has played a decisive role. The requirement of the design of the calorimeter is to have highly granular layers of detectors consisting of 1 mm2 as well as 1 cm2 silicon pad detectors. The high granular layers (1 mm2) yield good position resolution and tracking of incoming particles. Other active layers, composed of pads of 1 cm2 are used for energy measurement

  7. ALICE Zero Degree Calorimeter

    CERN Multimedia

    De Marco, N

    2013-01-01

    Two identical sets of calorimeters are located on both sides with respect to the beam Interaction Point (IP), 112.5 m away from it. Each set of detectors consists of a neutron (ZN) and a proton (ZP) Zero Degree Calorimeter (ZDC), positioned on remotely controlled platforms. The ZN is placed at zero degree with respect to the LHC beam axis, between the two beam pipes, while the ZP is positioned externally to the outgoing beam pipe. The spectator protons are separated from the ion beams by means of the dipole magnet D1.

  8. A New Calibration Technique for the ALICE Electromagnetic Calorimeter at the Large Hadron Collider

    Science.gov (United States)

    Watkins, E.; Perales, M.; Cervantes, M.; Garcia-Solis, E.; Sakai, S.; Ploskon, M.; Jacobs, P.

    2010-11-01

    The Large Hadron Collider at CERN is the world's largest and highest energy, particle and heavy ion collider. The LHC will explore the frontiers of particle physics using high energy proton+proton collisions and the properties of the Quark-Gluon Plasma through the collision of heavy nuclei at high energy. ALICE is one of the four LHC experiments, specialized for the study of heavy ion collisions. This study presents a new technique for the calibration of an essential detector of ALICE - the EMCal. We utilize various computational techniques and analyze proton-proton collision data recorded at 900 GeV. The ALICE TPC is used to isolate the tracks of e+e- pairs that originate from the decay of j/psi particle and that fall within the EMCal's acceptance. The TPC measures the momentum of these electron tracks, which is compared to the energy deposited by them in the EMCal. We therefore use the precise measurement of TPC momentum as the reference to calibrate the EMCal energy measurement. In this presentation we will show the steps taken to analyze the data from the TPC, how we performed the matching of electron tracks from the j/psi decay with the energy deposited in the EMCal, and some preliminary results of this calibration technique. Research funded by NSF and DoE.

  9. Electromagnetic Calorimeter for HADES

    CERN Document Server

    Czyzycki, W; Fabbietti, L; Golubeva, M; Guber, F; Ivashkin, A; Kajetanowicz, M; Krasa, A; Krizek, F; Kugler, A; Lapidus, K; Lisowski, E; Pietraszko, J; Reshetin, A; Salabura, P; Sobolev, Y; Stanislav, J; Tlusty, P; Torrieri, T; Traxler, M

    2011-01-01

    We propose to build the Electromagnetic calorimeter for the HADES di-lepton spectrometer. It will enable to measure the data on neutral meson production from nucleus-nucleus collisions, which are essential for interpretation of dilepton data, but are unknown in the energy range of planned experiments (2-10 GeV per nucleon). The calorimeter will improve the electron-hadron separation, and will be used for detection of photons from strange resonances in elementary and HI reactions. Detailed description of the detector layout, the support structure, the electronic readout and its performance studied via Monte Carlo simulations and series of dedicated test experiments is presented. The device will cover the total area of about 8 m^2 at polar angles between 12 and 45 degrees with almost full azimuthal coverage. The photon and electron energy resolution achieved in test experiments amounts to 5-6%/sqrt(E[GeV]) which is sufficient for the eta meson reconstruction with S/B ratio of 0.4% in Ni+Ni collisions at 8 AGeV....

  10. ELECTROMAGNET CALORIMETER (ECAL)

    CERN Multimedia

    R. Rusack

    Installation is under way of the last piece of the electromagnetic calorimeter. This is the preshower (ES) that sits in front of the two endcap calorimeters. The construction of the ES was completed in December and went through a detailed set of tests in December and January. The two preshower detectors have a total of 4300 silicon sensors with 137,000 strips. After final assembly and system testing in January, only two of the strips were found to be defective. Once CMS was fully opened a new support structure (‘Gazprom’) was put into place underneath the beam pipe, to support the Surkov platform, on which the preshower installation takes place. In the early hours of 26th February the first two Dees, which form the ‘ES+’ endcap,  were transported to P5 , a journey that took two and a half hours. The Dees, still inside environmental protection boxes, were then lowered  underground and moved to the ‘+’ end of CMS. Installation start...

  11. The KLOE electromagnetic calorimeter

    International Nuclear Information System (INIS)

    A general purpose detector, KLOE, is under construction for operations at the Frascati φ factory, DAΦNE. Its central mission is the study of direct CP violation in K0 decays, which places very stringent requirements on electromagnetic shower measurements in the 20-280 MeV/c region. We have chosen to use a lead-scintillator sampling calorimeter, EmC, consisting of very thin (0.5 mm) lead layers in which are embedded 1 mm diameter scintillating fibers. Much prototyping and testing has been done during its design, yielding, for the final EmC, an expected energy resolution of σ(E)/E similar 4.4%/√(E(GeV)) and a time resolution of similar 46 ps/√(E(GeV)), with excellent linearity in the region of interest and with little dependence on incidence angle and entry position. (orig.)

  12. Electromagnetic shower detector-calorimeters

    International Nuclear Information System (INIS)

    A brief review of the state-of-the-art of electromagnetic calorimeters is presented. The choice of detector based on the experimental requirements in cost, spatial resolution, energy resolution, and hadron rejection is discussed

  13. Electromagnetic Calorimeter for Hades Experiment

    Science.gov (United States)

    Kugler, A.; Blume, C.; Czyžycki, W.; Epple, E.; Fabbietti, L.; Galatyuk, T.; Golubeva, M.; Guber, F.; Hlaváč, S.; Ivashkin, A.; Kajetanowic, M.; Kardan, B.; Koenig, W.; Lapidus, K.; Lisowski, E.; Pietraszko, J.; Reshetin, A.; Rost, A.; Salabura, P.; Sobolev, Y. G.; Svoboda, O.; Tlusty, P.; Traxler, M.

    2014-06-01

    Electromagnetic calorimeter (ECAL) is being developed to complement the dilepton spectrometer HADES currently operating at GSI Darmstadt, Germany. ECAL will enable the HADES@FAIR experiment to measure data on neutral meson production in heavy ion collisions at the energy range of 2-10 A GeV on the beam of future accelerator SIS100@FAIR. The calorimeter will also improve the electron-hadron separation and will as well be used for the detection of photons from strange resonances in elementary and heavy ion reactions. Calorimeter modules constructed of lead glass Cherenkov counter, photomultiplier, HV divider and optical fiber are described in the detail. Two prototypes of novel front-end electronics based on TRB3 are presented. A dedicated LED based system being developed to monitor the stability of the calorimeter during beamtime is introduced as well.

  14. The AMS-02 electromagnetic calorimeter

    CERN Document Server

    Cadoux, F; Chambert-Hermel, V; Chen, G; Chen, H; Coignet, G; Di Falco, S; Dubois, J M; Falchini, E; Franzoso, A; Fougeron, D; Fouque, N; Galeotti, S; Girard, L; Goy, C; Hermel, R; Incagli, M; Kossakowski, R; Lieunard, B; Liu, Y; Liu, Z; Lomtadze, T A; Maestro, P; Marrocchesi, P S; Paoletti, R; Pilo, F; Rosier-Lees, S; Spinella, F; Turini, N; Valle, G D; Venanzoni, G; Vialle, J P; Yu, Z; Zhuang, H

    2002-01-01

    The Electromagnetic Calorimeter (ECAL) of the AMS-02 experiment is a lead-scintillating fibers sampling calorimeter characterized by high granularity that allows to image the longitudinal and lateral showers development, a key issue to provide high electron/hadron discrimination. The light collection system and the FE electronics are designed to let the calorimeter operate over a wide energy range from few GeV up to 1 TeV. A full-scale prototype of the e.m. calorimeter was tested at CERN in October 2001 using electrons and pions beams with energy ranging from 3 to 100 GeV. Effective sampling thickness, linearity and energy resolution were measured. (8 refs).

  15. ELECTROMAGNETIC CALORIMETER (ECAL)

    CERN Multimedia

    Roger Rusack

    Occupancy of the trigger primitives during a global run: the observed pattern is consistent with the polar angle dependence of the transverse energy equivalent of the electronic noise in the endcaps.   Progress on ECAL since the last CMS week has been mostly on three major fronts: we have continued with the installation and commissioning of the preshower detectors; the endcap calorimeter trigger has been installed and tested; and there have been many changes to the calorimeter detector control and safety systems. Both Preshower (ES) endcaps were installed in CMS on schedule, just before Easter. There followed a campaign of "first commissioning" to ensure that all services were correctly connected (electrical, optical, cooling, etc.). Apart from some optical ribbons that had to be replaced the process went rather smoothly, finishing on 23rd April. All power supplies are installed and operational. The cooling system (two branches of the joint Tracker-Preshower system) is fully fun...

  16. ALICE Zero Degree Calorimeter (ZDC), General Pictures.

    CERN Multimedia

    2003-01-01

    The ZDC Calorimeter for spectator neutrons is made by 44 slabs of W-alloy; each slab has 44 grooves where quartz fibres are placed. The charged particles of the hadronic shower generated by the neutrons make Cerenkov light in the fibres and the light is collected by photomultipliers. Photos from 1 to 9 show the front-face of the calorimeter. Photo n. 10 shows the rear of the calorimeter where the fibres are divided in several groups to go to the different PMs.

  17. ELECTROMAGNETIC CALORIMETER (ECAL)

    CERN Multimedia

    P. Bloch

    ECAL crystal calorimeter (EB + EE) The Barrel and Endcaps ECAL calorimeters have been used routinely in global runs. The CRAFT data have confirmed that ECAL performance is the same with or without magnetic field. The CRUZET and CRAFT runs have allowed experience to be gained with ECAL operation in many areas, in particular for the trigger and the calibration sequence using gap events (laser events and LED pulsing). More details can be found in the Commissioning/DPG report in this bulletin.   The last components remaining to be installed and commissioned are the specific Endcap Trigger modules (TCC-48). Most of the modules have been delivered to LLR and half of them are already at CERN. In parallel, large progress has been made on the validation of the TCC-48 firmware. Preshower (ES) The Preshower project has also made impressive progress during Autumn. All the elements required to complete the detector assembly are at hand. Ladder assembly, test and calibration with cosmic rays at the operating ...

  18. Electromagnetic Calorimeter for HADES Experiment

    Directory of Open Access Journals (Sweden)

    Rodríguez-Ramos P.

    2014-01-01

    Full Text Available Electromagnetic calorimeter (ECAL is being developed to complement dilepton spectrometer HADES. ECAL will enable the HADES@FAIR experiment to measure data on neutral meson production in heavy ion collisions at the energy range of 2-10 AGeV on the beam of future accelerator SIS100@FAIR. We will report results of the last beam test with quasi-monoenergetic photons carried out in MAMI facility at Johannes Gutenberg Universität Mainz.

  19. ELECTROMAGNETIC CALORIMETER (ECAL)

    CERN Multimedia

    P. Bloch

    ECAL Barrel (EB) The cabling of the ECAL Barrel services on YB0 was completed early December 2007. The team has now commissioned the complete Barrel. To run all the supermodules in parallel, it is necessary to remove the heat from the service cables on YB0. The corresponding thermal screens are being installed and, for the time being, a max¬imum of 25 supermodules has been run concurrently. EB is read out regularly with a local DAQ as well as with the central DAQ and trigger. The calorimeter trigger has also been commissioned, allowing us to trigger on cosmic muons. ECAL Endcaps (EE) The Endcaps crystal production will be completed before the end of March 2008, as planned. The gluing of the VPTs (Vacuum Photo Triodes) on the crystals and the assembly of Supercrystals (sets of 25 crystals) are proceeding at the pace of 16 Supercrystals (400 channels) per week. Two thirds of the Supercrystals needed for the complete EE have been produced. Their mounting on the Dee backplates (including the connectio...

  20. First tests of high resolution silicon pad detectors for the ALICE forward calorimeter

    International Nuclear Information System (INIS)

    To enrich the physics program of the ALICE experiment at CERN, a newly designed Electromagnetic Calorimeter is being proposed as a possible upgrade in the Forward pseudo rapidity region. The calorimeter will be installed at a distance of about 3.5 meters from the vertex and cover a region of 2.5 to 4.8 in pseudo rapidity. The detector will be a novel silicon-tungsten design, which will be used for the first time in any high-energy physics experiment. For full containment of photon energy up to 200 GeV it has been found that 24 radiation lengths (layers) of material is sufficient. For this purpose a sampling type calorimeter with tungsten (absorber) and silicon (active material) has been considered

  1. Time resolution of the SND electromagnetic calorimeter

    International Nuclear Information System (INIS)

    A new spectrometric channel of the SND electromagnetic calorimeter is described. It has a time resolution of about 1.3 ns at an energy deposition in the calorimeter crystal of 100 MeV and an amplitude resolution of about 250 keV. The new channel is designed, in particular, for the study of the e+e−→ n n-bar process at the VEPP-2000 e+e− collider

  2. Tungsen electromagnetic calorimeter of spaghetti type

    International Nuclear Information System (INIS)

    Energy and spatial characteristics of the electromagnetic spaghetti-calorimeter based on the tungsten punched modules and scintillating fibers are studied. The resolution dependence on the angle between the detected particle and the fibers has experimentally been obtained. The Monte-Carlo calculated values are in a good agreement with the results obtained. 9 refs.; 4 figs

  3. Electromagnetic calorimeter for HADES experiment

    Czech Academy of Sciences Publication Activity Database

    Kugler, Andrej; Blume, C.; Czyzycki, W.; Epple, E.; Fabbietti, L.; Galatyuk, T.; Golubeva, M.; Guber, F.; Hlaváč, S.; Ivashkin, A.; Kajetanowicz, M.; Kardan, B.; Koenig, W.; Lapidus, K.; Lisowski, E.; Pietraszko, J.; Reshetin, A.; Rost, A.; Salabura, P.; Sobolev, Yuri, G.; Svoboda, Ondřej; Tlustý, Pavel; Traxler, M.

    Vol. 8. Montreal: World Scientific Publishing Co. Pte. Ltd, 2014, s. 578-582. ISBN 978-981-4603-15-7. [14th International Conference on Advanced Technology and Particle Physics. Como (IT), 23.09.2013-27.09.2013] R&D Projects: GA MŠk LG12007; GA ČR GA13-06759S Institutional support: RVO:61389005 Keywords : HADES collaboration * calorimeter * HADES@FAIR Subject RIV: BG - Nuclear, Atomic and Molecular Physics, Colliders

  4. The ATLAS Electromagnetic Calorimeter Calibration Workshop

    CERN Multimedia

    Hong Ma; Isabelle Wingerter

    The ATLAS Electromagnetic Calorimeter Calibration Workshop took place at LAPP-Annecy from the 1st to the 3rd of October; 45 people attended the workshop. A detailed program was setup before the workshop. The agenda was organised around very focused presentations where questions were raised to allow arguments to be exchanged and answers to be proposed. The main topics were: Electronics calibration Handling of problematic channels Cluster level corrections for electrons and photons Absolute energy scale Streams for calibration samples Calibration constants processing Learning from commissioning Forty-five people attended the workshop. The workshop was on the whole lively and fruitful. Based on years of experience with test beam analysis and Monte Carlo simulation, and the recent operation of the detector in the commissioning, the methods to calibrate the electromagnetic calorimeter are well known. Some of the procedures are being exercised in the commisssioning, which have demonstrated the c...

  5. Study of a multiwire electromagnetic calorimeter

    International Nuclear Information System (INIS)

    Electromagnetic calorimeter performance with sampling, piling up of lead foils and wire chambers. It shows a non-linearity in partially saturated mode; this one grows up with chamber gain and will be about 1 TeV-1; 16%/√E resolution is obtained with mixing containing xenon, which limits degradation by magnetic field. Electron are identified by longitudinal profile of their shower with π contamination of 10-3

  6. The CMS Electromagnetic Calorimeter Detector Control System

    International Nuclear Information System (INIS)

    This paper presents the Detector Control System (DCS) designed and implemented for the Electromagnetic Calorimeter (ECAL) of the Compact Muon Solenoid (CMS) experiment at CERN. The focus is on its distributed controls software architecture, the deployment of the application into production and its integration into the overall CMS DCS. The knowledge acquired from operational issues during the detector commissioning and the first phase of the Large Hadron Collider (LHC) physics runs is discussed and future improvements are presented.

  7. Construction of a forward electro-magnetic calorimeter SCISSORS III

    International Nuclear Information System (INIS)

    A new electro-magnetic calorimeter complex FOREST with a solid angle of about 4π in total is under construction. It consists of three calorimeters: a forward one with CsI crystals, a middle one with lead scintillating fiber modules, and a backward one with lead glass Cerenkov counters. Recently, the forward calorimeter SCISSORS III takes shape. (author)

  8. CALICE silicon-tungsten electromagnetic calorimeter

    Indian Academy of Sciences (India)

    G Mavromanolakis

    2007-12-01

    A highly granular electromagnetic calorimeter prototype based on tungsten absorber and sampling units equipped with silicon pads as sensitive devices for signal collection is under construction. The full prototype will have in total 30 layers and be read out by about 10000 Si cells of 1 × 1 cm2. A first module consisting of 14 layers and depth of 7.2 0 at normal incidence, having in total 3024 channels of 1 cm2, was tested recently with - beam. We describe the prototype and discuss some preliminary testbeam results on its performance with respect to position resolution, response inhomogeneity and transverse containment.

  9. The electromagnetic calorimeter for the solenoidal tracker at RHIC

    International Nuclear Information System (INIS)

    This report discusses the following on the electromagnetic calorimeter for the solenoidal tracker at RHIC: conceptual design; the physics of electromagnetic calorimetry in STAR; trigger capability; integration into STAR; and cost, schedule, manpower, and funding

  10. Study of a novel electromagnetic liquid argon calorimeter TGT

    International Nuclear Information System (INIS)

    The concept and the basic design of a fast, highly granular and compact electromagnetic liquid argon calorimeter are described. This novel calorimeter offers uniform energy response and constant energy resolution independent of the production angle of an impinging particle and of its impact position at the calorimeter. An example of a calorimeter with full rapidity coverage in an application in a collider detector is given. An important aspect of the concept is the electronics for fast signal processing matched to the short charge collection time. We report on the experience with the realization of a prototype calorimeter module and on its performance in a test beam exposure. 15 refs., 16 figs., 2 tabs

  11. Electromagnetic Calorimeter Calibration with $\\pi^{0}$

    CERN Multimedia

    Puig Navarro, A

    2009-01-01

    Several methods can be used in order to achieve precise calibration of the LHCb Electromagnetic Calorimeter (ECAL) once reasonable cell equalization has been reached. At low transverse energy, the standard calibration procedure is an iterative method based on the fit of the $\\gamma\\gamma$ invariant mass distribution for each cell of the decay $\\pi^{0}\\to\\gamma\\gamma$ with resolved photons. A new technique for generating the combinatorial background of such decays directly from data has been developed. Knowledge of the background could allow an alternative calibration method based on a event by event fit of the same $\\gamma\\gamma$ invariant mass distribution where contributions from groups of cells are considered in a single fit. The background generation procedure and this possible new calibration method are presented in this poster, in addition to an overview of the LHCb Calorimetry system and ECAL calibration techniques.

  12. Scintillating LXe/LKr electromagnetic calorimeter

    International Nuclear Information System (INIS)

    A scintillating LXe/LKr electromagnetic calorimeter has been built at the ITEP and tested at the BATES (MIT) accelerator. The detector consists of a PMT matrix and 45 light collecting cells made of aluminized Mylar partially covered with p-terphenyl as a wavelength-shifter (WLS). Each pyramidal cell has (2.1 x 2.1) x 40 x (4.15 x 4.15) cm dimensions and is viewed by an FEU-85 glass-window photomultiplier. The detector has been exposed to the 106--348 MeV electron beam. The energy resolution is σE/E ≅ 5%/√E at 100--350 MeV range in LXe; the coordinate resolution is σX ≅ 0.7 cm; the time resolution is στ ≅ 0.6 ns for a single cell. Possible ways to improve energy resolution are discussed

  13. Trigger circuits for the PHENIX electromagnetic calorimeter

    International Nuclear Information System (INIS)

    Monolithic and discrete circuits have been developed to provide trigger signals for the PHENIX electromagnetic calorimeter detector. These trigger circuits are deadtimeless and create overlapping 4 by 4 energy sums, a cosmic muon trigger, and a 144 channel energy sum. The front end electronics of the PHENIX system sample the energy and timing channels at each bunch crossing (BC) but it is not known immediately if this data is of interest. The information from the trigger circuits is used to determine if the data collected is of interest and should be digitized and stored or discarded. This paper presents details of the design, issues affecting circuit performance, characterization of prototypes fabricated in 1.2 microm Orbit CMOS, and integration of the circuits into the EMCal electronics system

  14. Realtime calibration of the A4 electromagnetic lead fluoride calorimeter

    OpenAIRE

    Baunack, S.; Ríos, D. Balaguer; Capozza, L.; Diefenbach, J.; Frascaria, R.; Gläser, B.; Harrach, D. v.; Imai, Y.; Kothe, R.; Kunne, R.; Lee, J.H.; Maas, F. E.; Espí, M. C. Mora; Morlet, M.; Ong, S.

    2011-01-01

    Sufficient energy resolution is the key issue for the calorimetry in particle and nuclear physics. The calorimeter of the A4 parity violation experiment at MAMI is a segmented calorimeter where the energy of an event is determined by summing the signals of neighbouring channels. In this case the precise matching of the individual modules is crucial to obtain a good energy resolution. We have developped a calibration procedure for our total absorbing electromagnetic calorimeter which consists ...

  15. Performance of the PrimEx Electromagnetic Calorimeter

    OpenAIRE

    Kubantsev, M.; Larin, I.; A. Gasparyan; Collaboration, for the PrimEx

    2006-01-01

    We report the design and performance of the hybrid electromagnetic calorimeter consisting of 1152 $PbWO_4$ crystals and 576 lead glass blocks for the PrimEx experiment at the Jefferson Laboratory. The detector was built for high precision measurement of the neutral pion lifetime via the Primakoff effect. Calorimeter installation and commissioning was completed with the first physics run in fall of 2004. We present the energy and position resolution of the calorimeter. Obtained $\\pi^0$ mass re...

  16. Time of Flight resolution of the prototype of the electromagnetic calorimeter PHOS

    CERN Document Server

    Bogolyubsky, M; Kuryakin, A; Manko, V; Muller, H; Nomokonov, P; Punin, V; Rohrich, D; Sadovsky, S; Sibiriak, I; Skaali, B; Sugitate, T; Vasil’ev, A; Vinogradov, A; Vodopianov, A; Zhou, D

    2009-01-01

    The Time of Flight (TOF) resolution of one of the LHC ALICE detectors, a prototype of the electromagnetic calorimeter PHOS (PHOton Spectrometer), was measured in beam tests carried out at CERN PS. The prototype of the calorimeter consists of 256 cells of light-detecting PbWO4 (PWO) monocrystals read out with Avalanche Photo Diodes (APDs). Three dedicated front end cards with 24 channels of electronics were designed and produced for using in the tests, each channel consisting of one fast and two slow shapers, a time to amplitude converter and three identical 12-bit peak sensitive Analog to Digital Converters (ADCs). The high voltage bias regulator for APD is located on the same card. The measured TOF resolution is described as[...] .

  17. Electromagnetic response of a highly granular hadronic calorimeter

    International Nuclear Information System (INIS)

    The CALICE collaboration is studying the design of high performance electromagnetic and hadronic calorimeters for future International Linear Collider detectors. For the hadronic calorimeter, one option is a highly granular sampling calorimeter with steel as absorber and scintillator layers as active material. High granularity is obtained by segmenting the scintillator into small tiles individually read out via silicon photo-multipliers (SiPM). A prototype has been built, consisting of thirty-eight sensitive layers, segmented into about eight thousand channels. In 2007 the prototype was exposed to positrons and hadrons using the CERN SPS beam, covering a wide range of beam energies and incidence angles. The challenge of cell equalization and calibration of such a large number of channels is best validated using electromagnetic processes. The response of the prototype steel-scintillator calorimeter, including linearity and uniformity, to electrons is investigated and described. (orig.)

  18. Electromagnetic response of a highly granular hadronic calorimeter

    CERN Document Server

    Adloff, C; Blaising, J-J; Drancourt, C; Espargilière, A; Gaglione, R; Geffroy, N; Karyotakis, Y; Prast, J; Vouters, G; Francis, K; Repond, J; Smith, J; Xia, L; Baldolemar, E; Li, J; Park, S T; Sosebee, M; White, A P; Yu, J; Mikami, Y; Goto, N K Watson T; Mavromanolakis, G; Thomson, M A; Yan, D R Ward W; Benyamna, M; Cârloganu, C; Fehr, F; Gay, P; Manen, S; Royer, L; Blazey, G C; Dyshkant, A; Lima, J G R; Zutshi, V; Hostachy, J-Y; Morin, L; Cornett, U; David, D; Fabbri, R; Falley, G; Gadow, K; Garutti, E; Göttlicher, P; Günter, C; Karstensen, S; Krivan, F; Lucaci-Timoce, A-I; Lu, S; Lutz, B; Marchesini, I; Meyer, N; Morozov, S; Morgunov, V; Reinecke, M; Sefkow, F; Smirnov, P; Terwort, M; Vargas-Trevino, A; Wattimena, N; Wendt, O; Feege, N; Haller, J; Richter, S; Eckert, J Samson P; Kaplan, A; Schultz-Coulon, H-Ch; Shen, W; Stamen, R; Tadday, A; Bilki, B; Norbeck, E; Onel, Y; Wilson, G W; Kawagoe, K; Uozumi, S; Ballin, J A; Dauncey, P D; Magnan, A -M; Yilmaz, H S; Zorba, O; Bartsch, V; Postranecky, M; Warren, M; Wing, M; Salvatore, F; Alamillo, E Calvo; Fouz, M -C; Puerta-Pelayo, J; Balagura, V; Bobchenko, B; Chadeeva, M; Danilov, M; Epifantsev, A; Markin, O; Mizuk, R; Novikov, E; Rusinov, V; Tarkovsky, E; Soloviev, Y; Kozlov, V; Buzhan, P; Dolgoshein, B; Ilyin, A; Kantserov, V; Kaplin, V; Karakash, A; Popova, E; Smirnov, S; Frey, A; Kiesling, C; Seidel, K; Simon, F; Soldner, C; Weuste, L; Bonis, J; Bouquet, B; Callier, S; Cornebise, P; Doublet, Ph; Dulucq, F; Faucci Giannelli, M; Fleury, J; Guilhem, G; Li, H; Martin-Chassard, G; Richard, F; de la Taille, Ch; Pöschl, R; Raux, L; Seguin-Moreau, N; Wicek, F; Anduze, M; Boudry, V; Brient, J-C; Jeans, D; Mora de Freitas, P; Musat, G; Reinhard, M; Ruan, M; Videau, H; Bulanek, B; Zacek, J; Cvach, J; Gallus, P; Havranek, M; Janata, M; Kvasnicka, J; Lednicky, D; Marcisovsky, M; Polak, I; Popule, J; Tomasek, L; Tomasek, M; Ruzicka, P; Sicho, P; Smolik, J; Vrba, V; Zalesak, J; Belhorma, B; Ghazlane, H; Kotera, K; Nishiyama, M; Takeshita, T; Tozuka, S

    2010-01-01

    The CALICE collaboration is studying the design of high performance electromagnetic and hadronic calorimeters for future International Linear Collider detectors. For the hadronic calorimeter, one option is a highly granular sampling calorimeter with steel as absorber and scintillator layers as active material. High granularity is obtained by segmenting the scintillator into small tiles individually read out via silicon photo-multipliers (SiPM). A prototype has been built, consisting of thirty-eight sensitive layers, segmented into about eight thousand channels. In 2007 the prototype was exposed to positrons and hadrons using the CERN SPS beam, covering a wide range of beam energies and incidence angles. The challenge of cell equalization and calibration of such a large number of channels is best validated using electromagnetic processes. The response of the prototype steel-scintillator calorimeter, including linearity and uniformity, to electrons is investigated and described.

  19. Electromagnetic response of a highly granular hadronic calorimeter

    Energy Technology Data Exchange (ETDEWEB)

    Adloff, C.; Blaha, J.; Blaising, J.J. [Savoie Univ., CNRS/IN2P3, Annecy-le-Vieux (FR). Lab. d' Annecy-le-Vieux de Physique des Particules] (and others)

    2010-12-15

    The CALICE collaboration is studying the design of high performance electromagnetic and hadronic calorimeters for future International Linear Collider detectors. For the hadronic calorimeter, one option is a highly granular sampling calorimeter with steel as absorber and scintillator layers as active material. High granularity is obtained by segmenting the scintillator into small tiles individually read out via silicon photo-multipliers (SiPM). A prototype has been built, consisting of thirty-eight sensitive layers, segmented into about eight thousand channels. In 2007 the prototype was exposed to positrons and hadrons using the CERN SPS beam, covering a wide range of beam energies and incidence angles. The challenge of cell equalization and calibration of such a large number of channels is best validated using electromagnetic processes. The response of the prototype steel-scintillator calorimeter, including linearity and uniformity, to electrons is investigated and described. (orig.)

  20. The BaBar Electromagnetic Calorimeter: Status and Performance Improvements

    OpenAIRE

    Bauer, Johannes M.; Group, for the BaBar Collaboration EMC

    2006-01-01

    The electromagnetic calorimeter at the BaBar detector, part of the asymmetric B Factory at SLAC, measures photons in the energy range from 20 MeV to 8 GeV with high resolution. The current status of the calorimeter, now in its seventh year of operation, is being presented, as well as details on improvements made to the analysis code during the last years.

  1. Performance and Operation of the CMS Electromagnetic Calorimeter

    CERN Document Server

    Chatrchyan, S; Sirunyan, A M; Adam, W; Arnold, B; Bergauer, H; Bergauer, T; Dragicevic, M; Eichberger, M; Erö, J; Friedl, M; Frühwirth, R; Ghete, V M; Hammer, J; Hänsel, S; Hoch, M; Hörmann, N; Hrubec, J; Jeitler, M; Kasieczka, G; Kastner, K; Krammer, M; Liko, D; Magrans de Abril, I; Mikulec, I; Mittermayr, F; Neuherz, B; Oberegger, M; Padrta, M; Pernicka, M; Rohringer, H; Schmid, S; Schöfbeck, R; Schreiner, T; Stark, R; Steininger, H; Strauss, J; Taurok, A; Teischinger, F; Themel, T; Uhl, D; Wagner, P; Waltenberger, W; Walzel, G; Widl, E; Wulz, C E; Chekhovsky, V; Dvornikov, O; Emeliantchik, I; Litomin, A; Makarenko, V; Marfin, I; Mossolov, V; Shumeiko, N; Solin, A; Stefanovitch, R; Suarez Gonzalez, J; Tikhonov, A; Fedorov, A; Karneyeu, A; Korzhik, M; Panov, V; Zuyeuski, R; Kuchinsky, P; Beaumont, W; Benucci, L; Cardaci, M; De Wolf, E A; Delmeire, E; Druzhkin, D; Hashemi, M; Janssen, X; Maes, T; Mucibello, L; Ochesanu, S; Rougny, R; Selvaggi, M; Van Haevermaet, H; Van Mechelen, P; 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Niegel, M; Oberst, O; Oehler, A; Ott, J; Peiffer, T; Piparo, D; Quast, G; Rabbertz, K; Ratnikov, F; Ratnikova, N; Renz, M; Saout, C; Sartisohn, G; Scheurer, A; Schieferdecker, P; Schilling, F P; Schott, G; Simonis, H J; Stober, F M; Sturm, P; Troendle, D; Trunov, A; Wagner, W; Wagner-Kuhr, J; Zeise, M; Zhukov, V; Ziebarth, E B; Daskalakis, G; Geralis, T; Karafasoulis, K; Kyriakis, A; Loukas, D; Markou, A; Markou, C; Mavrommatis, C; Petrakou, E; Zachariadou, A; Gouskos, L; Katsas, P; Panagiotou, A; Evangelou, I; Kokkas, P; Manthos, N; Papadopoulos, I; Patras, V; Triantis, F A; Bencze, G; Boldizsar, L; Debreczeni, G; Hajdu, C; Hernath, S; Hidas, P; Horvath, D; Krajczar, K; Laszlo, A; Patay, G; Sikler, F; Toth, N; Vesztergombi, G; Beni, N; Christian, G; Imrek, J; Molnar, J; Novak, D; Palinkas, J; Szekely, G; Szillasi, Z; Tokesi, K; Veszpremi, V; Kapusi, A; Marian, G; Raics, P; Szabo, Z; Trocsanyi, Z L; Ujvari, B; Zilizi, G; Bansal, S; Bawa, H S; Beri, S B; Bhatnagar, V; Jindal, M; Kaur, M; 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Bendavid, J; Busza, W; Butz, E; Cali, I A; Chan, M; D'Enterria, D; Everaerts, P; Gomez Ceballos, G; Hahn, K A; Harris, P; Jaditz, S; Kim, Y; Klute, M; Lee, Y J; Li, W; Loizides, C; Ma, T; Miller, M; Nahn, S; Paus, C; Roland, C; Roland, G; Rudolph, M; Stephans, G; Sumorok, K; Sung, K; Vaurynovich, S; Wenger, E A; Wyslouch, B; Xie, S; Yilmaz, Y; Yoon, A S; Bailleux, D; Cooper, S I; Cushman, P; Dahmes, B; De Benedetti, A; Dolgopolov, A; Dudero, P R; Egeland, R; Franzoni, G; Haupt, J; Inyakin, A; Klapoetke, K; Kubota, Y; Mans, J; Mirman, N; Petyt, D; Rekovic, V; Rusack, R; Schroeder, M; Singovsky, A; Zhang, J; Cremaldi, L M; Godang, R; Kroeger, R; Perera, L; Rahmat, R; Sanders, D A; Sonnek, P; Summers, D; Bloom, K; Bockelman, B; Bose, S; Butt, J; Claes, D R; Dominguez, A; Eads, M; Keller, J; Kelly, T; Kravchenko, I; Lazo-Flores, J; Lundstedt, C; Malbouisson, H; Malik, S; Snow, G R; Baur, U; Iashvili, I; Kharchilava, A; Kumar, A; Smith, K; Strang, M; Alverson, G; Barberis, E; Boeriu, O; Eulisse, G; Govi, G; McCauley, T; Musienko, Y; Muzaffar, S; Osborne, I; Paul, T; Reucroft, S; Swain, J; Taylor, L; Tuura, L; Anastassov, A; Gobbi, B; Kubik, A; Ofierzynski, R A; Pozdnyakov, A; Schmitt, M; Stoynev, S; Velasco, M; Won, S; Antonelli, L; Berry, D; Hildreth, M; Jessop, C; Karmgard, D J; Kolberg, T; Lannon, K; Lynch, S; Marinelli, N; Morse, D M; Ruchti, R; Slaunwhite, J; Warchol, J; Wayne, M; Bylsma, B; Durkin, L S; Gilmore, J; Gu, J; Killewald, P; Ling, T Y; Williams, G; Adam, N; Berry, E; Elmer, P; Garmash, A; Gerbaudo, D; Halyo, V; Hunt, A; Jones, J; Laird, E; Marlow, D; Medvedeva, T; Mooney, M; Olsen, J; Piroué, P; Stickland, D; Tully, C; Werner, J S; Wildish, T; Xie, Z; Zuranski, A; Acosta, J G; Bonnett Del Alamo, M; Huang, X T; Lopez, A; Mendez, H; Oliveros, S; Ramirez Vargas, J E; Santacruz, N; Zatzerklyany, A; Alagoz, E; Antillon, E; Barnes, V E; Bolla, G; Bortoletto, D; Everett, A; Garfinkel, A F; Gecse, Z; Gutay, L; Ippolito, N; Jones, M; Koybasi, O; Laasanen, A T; Leonardo, N; Liu, C; Maroussov, V; Merkel, P; Miller, D H; Neumeister, N; Sedov, A; Shipsey, I; Yoo, H D; Zheng, Y; Jindal, P; Parashar, N; Cuplov, V; Ecklund, K M; Geurts, F J M; Liu, J H; Maronde, D; Matveev, M; Padley, B P; Redjimi, R; Roberts, J; Sabbatini, L; Tumanov, A; Betchart, B; Bodek, A; Budd, H; Chung, Y S; de Barbaro, P; Demina, R; Flacher, H; Gotra, Y; Harel, A; Korjenevski, S; Miner, D C; Orbaker, D; Petrillo, G; Vishnevskiy, D; Zielinski, M; Bhatti, A; Demortier, L; Goulianos, K; Hatakeyama, K; Lungu, G; Mesropian, C; Yan, M; Atramentov, O; Bartz, E; Gershtein, Y; Halkiadakis, E; Hits, D; Lath, A; Rose, K; Schnetzer, S; Somalwar, S; Stone, R; Thomas, S; Watts, T L; Cerizza, G; Hollingsworth, M; Spanier, S; Yang, Z C; York, A; Asaadi, J; Aurisano, A; Eusebi, R; Golyash, A; Gurrola, A; Kamon, T; Nguyen, C N; Pivarski, J; Safonov, A; Sengupta, S; Toback, D; Weinberger, M; Akchurin, N; Berntzon, L; Gumus, K; Jeong, C; Kim, H; Lee, S W; Popescu, S; Roh, Y; Sill, A; Volobouev, I; Washington, E; Wigmans, R; Yazgan, E; Engh, D; Florez, C; Johns, W; Pathak, S; Sheldon, P; Andelin, D; Arenton, M W; Balazs, M; Boutle, S; Buehler, M; Conetti, S; Cox, B; Hirosky, R; Ledovskoy, A; Neu, C; Phillips II, D; Ronquest, M; Yohay, R; Gollapinni, S; Gunthoti, K; Harr, R; Karchin, P E; Mattson, M; Sakharov, A; Anderson, M; Bachtis, M; Bellinger, J N; Carlsmith, D; Crotty, I; Dasu, S; Dutta, S; Efron, J; Feyzi, F; Flood, K; Gray, L; Grogg, K S; Grothe, M; Hall-Wilton, R; Jaworski, M; Klabbers, P; Klukas, J; Lanaro, A; Lazaridis, C; Leonard, J; Loveless, R; Magrans de Abril, M; Mohapatra, A; Ott, G; Polese, G; Reeder, D; Savin, A; Smith, W H; Sourkov, A; Swanson, J; Weinberg, M; Wenman, D; Wensveen, M; White, A

    2010-01-01

    The operation and general performance of the CMS electromagnetic calorimeter using cosmic-ray muons are described. These muons were recorded after the closure of the CMS detector in late 2008. The calorimeter is made of lead tungstate crystals and the overall status of the 75848 channels corresponding to the barrel and endcap detectors is reported. The stability of crucial operational parameters, such as high voltage, temperature and electronic noise, is summarised and the performance of the light monitoring system is presented.

  2. Energy Resolution Performance of the CMS Electromagnetic Calorimeter

    CERN Document Server

    Adzic, Petar; Almeida, Carlos; Almeida, Nuno; Anagnostou, Georgios; Anfreville, Marc; Anicin, Ivan; Antunovic, Zeljko; Auffray, Etiennette; Baccaro, Stefania; Baffioni, Stephanie; Barney, David; Barone, Luciano; Barrillon, Pierre; Bartoloni, Alessandro; Beauceron, Stephanie; Beaudette, Florian; Bell, Ken W; Benetta, Robert; Bercher, Michel; Berthon, Ursula; Betev, Botjo; Beuselinck, Raymond; Bhardwaj, Ashutosh; Biino, Cristina; Bimbot, Stephane; Blaha, Jan; Bloch, Philippe; Blyth, Simon; Bordalo, Paula; Bornheim, Adolf; Bourotte, Jean; Britton1, D; Brown, Robert M; Brunelière, Renaud; Busson, Philippe; Camporesi, Tiziano; Cartiglia, Nicolo; Cavallari, Francesca; Cerutti, Muriel; Chamont, David; Chang, Paoti; Chang, You-Hao; Charlot, Claude; Chatterji, Sudeep; Chen, E Augustine; Chipaux, Rémi; Choudhary, Brajesh C; Cockerill, David J A; Collard, Caroline; Combaret, Christophe; Cossutti, Fabio; Costantini, Silvia; Da Silva, J C; Dafinei, Ioan; Daskalakis, Georgios; Davatz, Giovanna; Debraine, Alain; Decotigny, David; De Min, Alberto; Deiters, Konrad; Dejardin, Marc; Della Negra, Rodolphe; Della Ricca, Giuseppe; Depasse, Pierre; Descamp, J; Dewhirst, Guy; Dhawan, Satish; Diemoz, Marcella; Dissertori, Günther; Dittmar, Michael; Djambazov, Lubomir; Dobrzynski, Ludwik; Drndarevic, Snezana; Dupanloup, Michel; Dzelalija, Mile; Ehlers, Jan; El-Mamouni, H; Peisert, Anna; Evangelou, Ioannis; Fabbro, Bernard; Faure, Jean-Louis; Fay, Jean; Ferri, Federico; Flower, Paul S; Franzoni, Giovanni; Funk, Wolfgang; Gaillac, Anne-Marie; Gargiulo, Corrado; Gascon-Shotkin, S; Geerebaert, Yannick; Gentit, François-Xavier; Ghezzi, Alessio; Gilly, Jean; Giolo-Nicollerat, Anne-Sylvie; Givernaud, Alain; Gninenko, Sergei; Go, Apollo; Godinovic, Nikola; Golubev, Nikolai; Golutvin, Igor; Gómez-Reino, Robert; Govoni, Pietro; Grahl1, J; Gras1, P; Greenhalgh, Justin; Guillaud, Jean-Paul; Haguenauer, Maurice; Hamel-de-Montechenault, G; Hansen, Magnus; Heath, Helen F; AHill, J; Hobson, Peter R; Holmes, Daniel; Holzner, André; Hou, George Wei-Shu; Ille, Bernard; Ingram, Quentin; Jain, Adarsh; Jarry, Patrick; Jauffret, C; Jha, Manoj; Karar, Akli; Kataria, Sushil Kumar; Katchanov, V A; Kennedy, Bruce W; Kloukinas, Kostas; Kokkas, Panagiotis; Korjik, M; Krasnikov, Nikolai; Krpic, Dragomir; Kyriakis, Aristotelis; Lebeau, Michel; Lecomte, Pierre; Lecoq, Paul; Lemaire, Marie-Claude; Lethuillier, Morgan; Lin, Willis; Lintern, A L; Lister, Alison; Litvin, V; Locci, Elizabeth; Lodge, Anthony B; Longo, Egidio; Loukas, Demetrios; Luckey, D; Lustermann, Werner; Lynch, Clare; MacKay, Catherine Kirsty; Malberti, Martina; Maletic, Dimitrije; Mandjavidze, Irakli; Manthos, Nikolaos; Markou, Athanasios; Mathez, Hervé; Mathieu, Antoine; Matveev, Viktor; Maurelli, Georges; Menichetti, Ezio; Meridiani, Paolo; Milenovic, Predrag; Milleret, Gérard; Miné, Philippe; Mur, Michel; Musienko, Yuri; Nardulli, Alessandro; Nash, Jordan; Neal, Homer; Nédélec, Patrick; Negri, Pietro; Nessi-Tedaldi, Francesca; Newman26, H B; Nikitenko, Alexander; Obertino, Maria Margherita; Ofierzynski, Radoslaw Adrian; Organtini, Giovanni; Paganini, Pascal; Paganoni, Marco; Papadopoulos, Ioannis; Paramatti, Riccardo; Pastrone, Nadia; Pauss, Felicitas; Poilleux, Patrick; Puljak, Ivica; Pullia, Antonino; Puzovic, Jovan; Ragazzi, Stefano; Ramos, Sergio; Rahatlou, Shahram; Rander, John; Ranjan, Kirti; Ravat, Olivier; Raymond, M; Razis, Panos A; Redaelli, Nicola; Renker, Dieter; Reucroft, Steve; Reymond, Jean-Marc; Reynaud, Michel; Reynaud, Serge; Romanteau, Thierry; Rondeaux, Françoise; Rosowsky, André; Rovelli, Chiara; Rumerio, Paolo; Rusack, Roger; Rusakov, Sergey V; Ryan, Matthew John; Rykaczewski, Hans; Sakhelashvili, Tariel; Salerno, Roberto; Santos, Marcelino; Seez, Christopher; Semeniouk, Igor; Sharif, Omar; Sharp, Peter; Shepherd-Themistocleous, Claire; Shevchenko, Sergey; Shivpuri, Ram Krishen; Sidiropoulos, Georgios; Sillou, Daniel; Singovsky, Alexander; Sirois, Yves; Sirunyan, Albert M; Smith, Brian; Smith, Vincent J; Sproston, Martin; Suter, Henry; Swain, John; Tabarelli de Fatis, Tommaso; Takahashi, Maiko; Tapper, Robert J; Tcheremoukhine, Alexandre; Teixeira, Isabel; Teixeira, Joao Paulo; Teller, Olivier; Timlin, Claire; ATriantis, F; Troshin, Sergey; Tyurin, Nikolay; Ueno, Koji; Uzunian, Andrey; Varela, Joao; Vaz-Cardoso, N; Verrecchia, Patrice; Vichoudis, Paschalis; Vigano, S; Viertel, Gert; Virdee, Tejinder; Vlassov, E; Wang, Minzu; Weinstein, Alan; Williams, Jennifer C; Yaselli, Ignacio; Zabi, Alexandre; Zamiatin, Nikolai; Zelepoukine, Serguei; Zeller, Michael E; Zhang, Lin; Zhang, Yawei; Zhu, Kejun; Zhu, Ren-Yuan

    2006-01-01

    The energy resolution performance of the CMS lead tungstate crystal electromagnetic calorimeter is presented. Measurements were made with an electron beam using a fully equipped supermodule of the calorimeter barrel. Results are given both for electrons incident on the centre of crystals and for electrons distributed uniformly over the calorimeter surface. The electron energy is reconstructed in matrices of 3 times 3 or 5 times 5 crystals centred on the crystal containing the maximum energy. Corrections for variations in the shower containment are applied in the case of uniform incidence. The resolution measured is consistent with the design goals.

  3. The Electromagnetic Barrel Calorimeter for the GlueX Experiment

    International Nuclear Information System (INIS)

    The electromagnetic barrel calorimeter is one of the main components of the planned GlueX experiment. It will consist of 48 modules made of consecutive layers of 4 m long lead sheet and fast green scintillator fibers for an overall number of approximately 3000 readout channels with silicon-photomultiplier-based photo-sensors for light collection. The calorimeter is expected to achieve energy and time resolution better than 5% bigsl √(E)+ 2% and 200 ps, respectively. In this contribution we present an overview of the calorimeter design and some preliminary studies of its performance using Monte Carlo simulations and beam test measurements

  4. The ATLAS liquid argon electromagnetic calorimeter construction status

    CERN Document Server

    Jérémie, A

    2004-01-01

    The construction and assembly of the ATLAS liquid argon electromagnetic calorimeter was described. The calorimeter was built with accordion geometry composed of lead absorbers, liquid argon as ionizing medium and highly granular readout electrodes. The calorimeter was composed of the Barrel and the End-cap, both preceded by presampler sectors to ensure complete recovery of the energy resolution. The detection of cabling errors and testing of the whole calibration chain was done by sending a pulse through the calibration circuit with single readout. (Edited abstract) 3 Refs.

  5. Energy calibration of the electromagnetic forward calorimeters in ATLAS

    International Nuclear Information System (INIS)

    The electromagnetic forward calorimeters of the ATLAS detector are responsible for the measurement of the energy of electrons in the region from 2.5 < η < 4.9. In this so called forward region tracking coverage is not available implying that electrons need to be reconstructed and identified by calorimetric information only. A calibration of the electromagnetic forward calorimeters is of importance for many electroweak measurements and searches for new physics. The energy calibration is based on an integrated luminosity of 20.3 fb-1 of proton-proton collision data at √(s) = 8 TeV recorded with the ATLAS detector in 2012. A selection of Z → ee events with one electron in the forward region and one electron in the more central region is performed to compare the shape of the Z resonance in data and simulations. This talk discusses the detailed approach to accomplish the calibration of the electromagnetic forward calorimeters in ATLAS.

  6. 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...

  7. Performance of the GEM electromagnetic calorimeter

    International Nuclear Information System (INIS)

    The GEM EM calorimeter is optimized for the best energy, position, angular resolution and jet rejection. The detailed simulation results are presented. In the barrel with LKr, an energy resolution of about 6%/√ direct-sum 0.4%, pointing resolution of 40mrad/√E + 0.5mrad, and jet rejection of a factor of 5 are expected

  8. Properties of the avalanche photodiodes for the CMS electromagnetic calorimeter

    International Nuclear Information System (INIS)

    The electromagnetic calorimeter of the CMS experiment at CERN's Large Hadron Collider will use 122 400 Avalanche Photodiodes from Hamamatsu Photonics. The design of this APD type is the result of a long R and D program performed by Hamamatsu Photonics and the CMS collaboration. The APD parameters including the behavior under irradiation are discussed in view of our application

  9. Properties of the avalanche photodiodes for the CMS electromagnetic calorimeter

    CERN Document Server

    Deiters, K; Musienko, Yu V; Nicol, S; Patel, P; Renker, D; Reucroft, S; Rusack, R W; Sakhelashvili, T M; Swain, J D; Vikas, P

    2000-01-01

    The electromagnetic calorimeter of the CMS experiment at CERN's Large Hadron Collider will use 122400 avalanche photodiodes from Hamamatsu Photonics. The design of this APD type is the result of a long R&D program performed by Hamamatsu photonics and the CMS Collaboration. The APD parameters including the behavior under irradiation are discussed in view of our application. (4 refs).

  10. Crosstalk in production modules of the Electromagnetic Endcap Calorimeter

    CERN Document Server

    Hubaut, Fabrice; Dekhissi, Bouchra; Derkaoui, Jamal Eddine; El-Kharrim, Abderrahman; Maaroufi, Fatiha

    2003-01-01

    Various types of crosstalk, measured with ATLAS-like electronics on three electromagnetic endcap calorimeter production modules at liquid argon temperature are reviewed. A comparison is made between the three modules results and previous measurements. The effect on the physics data is discussed.

  11. Performance characteristics of an electromagnetic streamer tube calorimeter

    International Nuclear Information System (INIS)

    We have tested an electromagnetic streamer tube calorimeter in an electron beam in the energy range 1-70 GeV. Also the dependence of the response and energy resolution on the particle rate and magnetic field were investigated. A magnetic field transverse to the streamer tubes has no effect, while a field parallel to the wires deteriorates the energy resolution. (orig.)

  12. Performance characteristics of an electromagnetic streamer tube calorimeter

    Energy Technology Data Exchange (ETDEWEB)

    Baumgart, R.; Grupen, C.; Meyer, H.J.; Schaefer, U.

    1987-05-01

    We have tested an electromagnetic streamer tube calorimeter in an electron beam in the energy range 1-70 GeV. Also the dependence of the response and energy resolution on the particle rate and magnetic field were investigated. A magnetic field transverse to the streamer tubes has no effect, while a field parallel to the wires deteriorates the energy resolution.

  13. Performance of an accordion electromagnetic calorimeter with liquid krypton

    International Nuclear Information System (INIS)

    Beam test results of the liquid krypton electromagnetic calorimeter with a projective accordion type electrode structure are presented. The electrode had a fine segmentation in the front to enhance π0 rejection and pointing. The test was carried out at the H4 line at the CERN SPS with e- beams between 20 and 200 GeV. Preliminary results of energy resolution, linearity, μ response and the dependence of the energy resolution on the amount of inactive material in front of the calorimeter are presented

  14. The electromagnetic calorimeter of the AMS-02 experiment

    CERN Document Server

    Vecchi, M; Bigongiari, G; Cervelli, F; Chen, G; Chen, G M; Chen, H S; Coignet, G; Di Falco, S; Elles, S; Fiasson, A; Fougeron, D; Gallucci, G; Goy, C; Incagli, M; Kossakowki, R; Lepareur, V; Li, Z H; Maire, M; Paniccia, M; Pilo, F; Rosier-Lees, S; Tang, X W; Vannini, C; Vialle, J P; Zhuang, H L

    2012-01-01

    The electromagnetic calorimeter (ECAL) of the AMS-02 experiment is a 3-dimensional sampling calorimeter, made of lead and scintillating fibers. The detector allows for a high granularity, with 18 samplings in the longitudinal direction, and 72 sampling in the lateral direction. The ECAL primary goal is to measure the energy of cosmic rays up to few TeV, however, thanks to the fine grained structure, it can also provide the separation of positrons from protons, in the GeV to TeV region. A direct measurement of high energy photons with accurate energy and direction determination can also be provided.

  15. The lead-glass electromagnetic calorimeter for the SELEX experiment

    International Nuclear Information System (INIS)

    A large-acceptance, highly segmented electromagnetic lead-glass calorimeter for Experiment E781 (SELEX) at Fermi National Acceleration Laboratory was designed and built. This detector has been used to reconstruct photons and electrons with energies ranging from a few GeV up to 500GeV in the collisions of the 600GeV Σ- hyperons, π mesons and protons with the target nucleons. The design, calibration and performance of the calorimeter are described. Energy resolution and position resolution are assessed using both calibration electron beams and π0 mesons reconstructed in 600GeV hadron-hadron interactions. The performance of the calorimeter in selecting resonant states that involve photons is demonstrated

  16. Performance of the PrimEx Electromagnetic Calorimeter

    International Nuclear Information System (INIS)

    We report the design and performance of the hybrid electromagnetic calorimeter consisting of 1152 PbWO4 crystals and 576 lead glass blocks for the PrimEx experiment at the Jefferson Laboratory. The detector was built for high precision measurement of the neutral pion lifetime via the Primakoff effect. Calorimeter installation and commissioning was completed with the first physics run in fall of 2004. We present the energy and position resolution of the calorimeter. Obtained π0 mass resolution of 1.3 MeV/c2 and its production angle resolution of 0.34 mrad demonstrate the ability of the experiment to extract the π0 lifetime on one percent level

  17. Performance of the PrimEx Electromagnetic Calorimeter

    CERN Document Server

    Kubantsev, M; Gasparyan, A

    2006-01-01

    We report the design and performance of the hybrid electromagnetic calorimeter consisting of 1152 $PbWO_4$ crystals and 576 lead glass blocks for the PrimEx experiment at the Jefferson Laboratory. The detector was built for high precision measurement of the neutral pion lifetime via the Primakoff effect. Calorimeter installation and commissioning was completed with the first physics run in fall of 2004. We present the energy and position resolution of the calorimeter. Obtained $\\pi^0$ mass resolution of $1.3 \\mathrm{MeV/c^2}$ and its production angle resolution of $0.34 \\mathrm{mrad}$ demonstrate the ability of the experiment to extract the $\\pi^0$ lifetime on one percent level.

  18. Performance of the PrimEx Electromagnetic Calorimeter

    International Nuclear Information System (INIS)

    We report the design and performance of the hybrid electromagnetic calorimeter consisting of 1152 PbWO4 crystals and 576 lead glass blocks for the PrimEx experiment at the Jefferson Laboratory. The detector was built for high precision measurement of the neutral pion lifetime via the Primakoff effect. Calorimeter installation and commissioning was completed with the first physics run in fall of 2004. We present the energy and position resolution of the calorimeter. Obtained π0 mass resolution of 1.3MeV/c2 and its production angle resolution of 0.34mrad demonstrate the ability of the experiment to extract the π0 lifetime on one percent level

  19. A FLUKA simulation of the KLOE electromagnetic calorimeter

    International Nuclear Information System (INIS)

    We present the simulation of the KLOE calorimeter with the FLUKA Monte Carlo program. The response of the detector to electromagnetic showers has been studied and compared with the publicly available KLOE data. The energy and the time resolution of the electromagnetic clusters is in good agreement with the data. The simulation has been also used to study a possible improvement of the KLOE calorimeter using multianode photo-multipliers. An HAMAMATSU R7600-M16 photomultiplier has been assembled in order to determine the whole cross talk matrix that has been included in the simulation. The cross talk matrix takes into account the effects of a realistic photo-multiplier's electronics and of its coupling to the active material. The performance of the modified readout has been compared to the usual KLOE configuration

  20. A MAPS-based Digital Electromagnetic Calorimeter for the ILC

    OpenAIRE

    Ballin, J. A.; Dauncey, P. D.; Magnan, A. -M.; Noy, M.; Y. Mikami; Miller, O.; Rajović, V.; Watson, N. K.; Wilson, J. A.; Crooks, J. P.; Stanitzki, M.; Stefanov, K. D.; R. Turchetta; Tyndel, M.; Villani, E. G.

    2007-01-01

    A novel design for a silicon-tungsten electromagnetic calorimeter is described, based on Monolithic Active Pixel Sensors (MAPS). A test sensor with a pixel size of 50x50 um2 has been fabricated in July 2007. The simulation of the physical sensor is done using a detailed three-dimensional charge spread algorithm. Physics studies of the sensor are done including a digitisation algorithm taking into account the charge sharing, charge collection efficiency, noise, and dead areas. The influence of...

  1. Performance characteristics of an electromagnetic streamer tube calorimeter

    International Nuclear Information System (INIS)

    We have tested an electromagnetic streamer tube calorimeter in an electron beam in the energy range 1-70 GeV. Also the dependence of the response and energy resolution on the particle rate and magnetic field were investigated. A magnetic field transverse to the streamer tubes has no effect, while a field parallel to the wires deteriorates the energy resolution. (orig.) With 14 figs

  2. Stabilized dye laser for crystal electromagnetic calorimeter monitoring

    CERN Document Server

    Singovsky, A V; Korzhik, M V; Lopatik, A; Peigneux, J P; Moinester, M A; Steiner, V

    2002-01-01

    A slow laser output drift stabilization system was described. The system stabilized the light output of a commercial dye laser to the level of 0.3%. The results showed that the use of a stabilized laser light source for monitoring of electromagnetic calorimeter crystals would simplify the monitoring system design. It would also improve the overall monitoring system performance by removing the light output correction term. (Edited abstract) 15 Refs. --- 22 --- AN

  3. Time Reconstruction and Performance of the CMS Electromagnetic Calorimeter

    CERN Document Server

    Chatrchyan, S; Sirunyan, A M; Adam, W; Arnold, B; Bergauer, H; Bergauer, T; Dragicevic, M; Eichberger, M; Erö, J; Friedl, M; Frühwirth, R; Ghete, V M; Hammer, J; Hänsel, S; Hoch, M; Hörmann, N; Hrubec, J; Jeitler, M; Kasieczka, G; Kastner, K; Krammer, M; Liko, D; Magrans de Abril, I; Mikulec, I; Mittermayr, F; Neuherz, B; Oberegger, M; Padrta, M; Pernicka, M; Rohringer, H; Schmid, S; Schöfbeck, R; Schreiner, T; Stark, R; Steininger, H; Strauss, J; Taurok, A; Teischinger, F; Themel, T; Uhl, D; Wagner, P; Waltenberger, W; Walzel, G; Widl, E; Wulz, C E; Chekhovsky, V; Dvornikov, O; Emeliantchik, I; Litomin, A; Makarenko, V; Marfin, I; Mossolov, V; Shumeiko, N; Solin, A; Stefanovitch, R; Suarez Gonzalez, J; Tikhonov, A; Fedorov, A; Karneyeu, A; Korzhik, M; Panov, V; Zuyeuski, R; Kuchinsky, P; Beaumont, W; Benucci, L; Cardaci, M; De Wolf, E A; Delmeire, E; Druzhkin, D; Hashemi, M; Janssen, X; Maes, T; Mucibello, L; Ochesanu, S; Rougny, R; Selvaggi, M; Van Haevermaet, H; Van Mechelen, P; Van Remortel, N; Adler, V; Beauceron, S; Blyweert, S; D'Hondt, J; De Weirdt, S; Devroede, O; Heyninck, J; Kalogeropoulos, A; Maes, J; Maes, M; Mozer, M U; Tavernier, S; Van Doninck, W; Van Mulders, P; Villella, I; Bouhali, O; Chabert, E C; Charaf, O; Clerbaux, B; De Lentdecker, G; Dero, V; Elgammal, S; Gay, A P R; Hammad, G H; Marage, P E; Rugovac, S; Vander Velde, C; Vanlaer, P; Wickens, J; Grunewald, M; Klein, B; Marinov, A; Ryckbosch, D; Thyssen, F; Tytgat, M; Vanelderen, L; Verwilligen, P; Basegmez, S; Bruno, G; Caudron, J; Delaere, C; Demin, P; Favart, D; Giammanco, A; Grégoire, G; Lemaitre, V; Militaru, O; Ovyn, S; Piotrzkowski, K; Quertenmont, L; Schul, N; Beliy, N; Daubie, E; Alves, G A; Pol, M E; Souza, M H G; Carvalho, W; De Jesus Damiao, D; De Oliveira Martins, C; Fonseca De Souza, S; Mundim, L; Oguri, V; Santoro, A; Silva Do Amaral, S M; Sznajder, A; Fernandez Perez Tomei, T R; Ferreira Dias, M A; Gregores, E M; Novaes, S F; Abadjiev, K; Anguelov, T; Damgov, J; Darmenov, N; 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Bendavid, J; Busza, W; Butz, E; Cali, I A; Chan, M; D'Enterria, D; Everaerts, P; Gomez Ceballos, G; Hahn, K A; Harris, P; Jaditz, S; Kim, Y; Klute, M; Lee, Y J; Li, W; Loizides, C; Ma, T; Miller, M; Nahn, S; Paus, C; Roland, C; Roland, G; Rudolph, M; Stephans, G; Sumorok, K; Sung, K; Vaurynovich, S; Wenger, E A; Wyslouch, B; Xie, S; Yilmaz, Y; Yoon, A S; Bailleux, D; Cooper, S I; Cushman, P; Dahmes, B; De Benedetti, A; Dolgopolov, A; Dudero, P R; Egeland, R; Franzoni, G; Haupt, J; Inyakin, A; Klapoetke, K; Kubota, Y; Mans, J; Mirman, N; Petyt, D; Rekovic, V; Rusack, R; Schroeder, M; Singovsky, A; Zhang, J; Cremaldi, L M; Godang, R; Kroeger, R; Perera, L; Rahmat, R; Sanders, D A; Sonnek, P; Summers, D; Bloom, K; Bockelman, B; Bose, S; Butt, J; Claes, D R; Dominguez, A; Eads, M; Keller, J; Kelly, T; Kravchenko, I; Lazo-Flores, J; Lundstedt, C; Malbouisson, H; Malik, S; Snow, G R; Baur, U; Iashvili, I; Kharchilava, A; Kumar, A; Smith, K; Strang, M; Alverson, G; Barberis, E; Boeriu, O; Eulisse, G; 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Liu, C; Maroussov, V; Merkel, P; Miller, D H; Neumeister, N; Sedov, A; Shipsey, I; Yoo, H D; Zheng, Y; Jindal, P; Parashar, N; Cuplov, V; Ecklund, K M; Geurts, F J M; Liu, J H; Maronde, D; Matveev, M; Padley, B P; Redjimi, R; Roberts, J; Sabbatini, L; Tumanov, A; Betchart, B; Bodek, A; Budd, H; Chung, Y S; de Barbaro, P; Demina, R; Flacher, H; Gotra, Y; Harel, A; Korjenevski, S; Miner, D C; Orbaker, D; Petrillo, G; Vishnevskiy, D; Zielinski, M; Bhatti, A; Demortier, L; Goulianos, K; Hatakeyama, K; Lungu, G; Mesropian, C; Yan, M; Atramentov, O; Bartz, E; Gershtein, Y; Halkiadakis, E; Hits, D; Lath, A; Rose, K; Schnetzer, S; Somalwar, S; Stone, R; Thomas, S; Watts, T L; Cerizza, G; Hollingsworth, M; Spanier, S; Yang, Z C; York, A; Asaadi, J; Aurisano, A; Eusebi, R; Golyash, A; Gurrola, A; Kamon, T; Nguyen, C N; Pivarski, J; Safonov, A; Sengupta, S; Toback, D; Weinberger, M; Akchurin, N; Berntzon, L; Gumus, K; Jeong, C; Kim, H; Lee, S W; Popescu, S; Roh, Y; Sill, A; Volobouev, I; Washington, E; Wigmans, R; Yazgan, E; Engh, D; Florez, C; Johns, W; Pathak, S; Sheldon, P; Andelin, D; Arenton, M W; Balazs, M; Boutle, S; Buehler, M; Conetti, S; Cox, B; Hirosky, R; Ledovskoy, A; Neu, C; Phillips II, D; Ronquest, M; Yohay, R; Gollapinni, S; Gunthoti, K; Harr, R; Karchin, P E; Mattson, M; Sakharov, A; Anderson, M; Bachtis, M; Bellinger, J N; Carlsmith, D; Crotty, I; Dasu, S; Dutta, S; Efron, J; Feyzi, F; Flood, K; Gray, L; Grogg, K S; Grothe, M; Hall-Wilton, R; Jaworski, M; Klabbers, P; Klukas, J; Lanaro, A; Lazaridis, C; Leonard, J; Loveless, R; Magrans de Abril, M; Mohapatra, A; Ott, G; Polese, G; Reeder, D; Savin, A; Smith, W H; Sourkov, A; Swanson, J; Weinberg, M; Wenman, D; Wensveen, M; White, A

    2010-01-01

    The resolution and the linearity of time measurements made with the CMS electromagnetic calorimeter are studied with samples of data from test beam electrons, cosmic rays, and beam-produced muons. The resulting time resolution measured by lead tungstate crystals is better than 100 ps for energy deposits larger than 10 GeV. Crystal-to-crystal synchronization with a precision of 500 ps is performed using muons produced with the first LHC beams in 2008.

  4. First physics pulses in the Barrel Electromagnetic Calorimeter with cosmics

    CERN Multimedia

    Laurent Serin

    2006-01-01

    The electromagnetic barrel calorimeter has been installed in its final position in October 2005. Since then, the calorimeter is being equipped with front-end electronics. Starting in April 2006, electronics calibration runs are taken a few times per week to debug the electronics and to study the performance in the pit (stability, noise). Today, 10 out of the 32 Front End crates are being read out, amounting to about 35000 channels. cool down, few little typos --> After a 6-week cool down, the barrel cryostat was filled with Liquid Argon in May. The presence of a few shorts (~1MΩ) at the edges of the modules was indicating the possibility of conducting dust having entered into the calorimeter with the flowing liquid. In order to try to improve this situation, the calorimeter was emptied and filled again, but this time by condensating the argon instead of flowing it in liquid phase. The new High Voltage tests are not showing any significant improvement but the situation is statisfactory for ATLAS runn...

  5. Operation and performance of the CMS Electromagnetic Calorimeter

    CERN Document Server

    Malberti, Martina

    2011-01-01

    The CMS Electromagnetic Calorimeter (ECAL) is a high resolution, finely grained calorimeter devised to measure photons and electrons at LHC. Built of lead tungstate crystals, it plays a crucial role in the search for new physics as well as in precision measurements in the Standard Model. The operation and general performance of the CMS ECAL in proton-proton collisions at sqrt{s} = 7 TeV are described. The precision of the inter-channel synchronization and calibration has been verified and improved exploiting in-situ data. Di-electron and di-photon states have been also used to verify and tune the energy scale. The quality of the offline data reconstruction, from low level quantities to showers, has been investigated and improved using known physics processes. Collision data and thorough data/MC comparisons have been used to measure and tune the detector performance. First performance results are given.

  6. Response Uniformity of the ATLAS Liquid Argon Electromagnetic Calorimeter

    CERN Document Server

    Aharrouche, M; Di Ciaccio, L; El Kacimi, M; Gaumer, O; Gouanère, M; Goujdami, D; Lafaye, R; Laplace, S; Le Maner, C; Neukermans, L; Perrodo, P; Poggioli, L; Prieur, D; Przysiezniak, H; Sauvage, G; Wingerter-Seez, I; Zitoun, R; Lanni, F; Lü, L; Ma, H; Rajagopalan, S; Takai, H; Belymam, A; Benchekroun, D; Hakimi, M; Hoummada, A; Gao, Y; Stroynowsk, R; Aleksa, M; Carli, T; Fassnacht, P; Gianotti, F; Hervás, L; Lampl, W; Collot, J; Hostachy, J Y; Ledroit-Guillon, F; Malek, F; Martin, P; Viret, S; Leltchouk, M; Parsons, J A; Simion, S; Barreiro, F; Del Peso, J; Labarga, L; Oliver, C; Rodier, S; Barrillon, P; Benchouk, C; Djama, F; Hubaut, F; Monnier, E; Pralavorio, P; Sauvage, D; Serfon, C; Tisserant, S; Tóth, J; Banfi, D; Carminati, L; Cavalli, D; Costa, G; Delmastro, M; Fanti, M; Mandell, L; Mazzanti, M; Tartarelli, F; Kotov, K; Maslennikov, A; Pospelov, G; Tikhonov, Yu; Bourdarios, C; Fayard, L; Fournier, D; Iconomidou-Fayard, L; Kado, M; Parrour, G; Puzo, P; Rousseau, D; Sacco, R; Serin, L; Unal, G; Zerwas, D; Dekhissi, B; Derkaoui, J; EL Kharrim, A; Maaroufi, F; Cleland, W; Lacour, D; Laforge, B; Nikolic-Audit, I; Schwemling, Ph; Ghazlane, H; Cherkaoui El Moursli, R; Idrissi Fakhr-Eddine, A; Boonekamp, M; Kerschen, N; Mansoulié, B; Meyer, P; Schwindlingy, J; Lund-Jensen, B

    2007-01-01

    The construction of the ATLAS electromagnetic liquid argon calorimeter modules is completed and all the modules are assembled and inserted in the cryostats. During the production period four barrel and three endcap modules were exposed to test beams in order to assess their performance, ascertain the production quality and reproducibility, and to scrutinize the complete energy reconstruction chain from the readout and calibration electronics to the signal and energy reconstruction. It was also possible to check the full Monte Carlo simulation of the calorimeter. The analysis of the uniformity, resolution and extraction of constant term is presented. Typical non-uniformities of 0.5% and typical global constant terms of 0.6% are measured for the barrel and end-cap modules.

  7. Geometric calibration of the SND detector electromagnetic calorimeter

    CERN Document Server

    Korol, A A

    2016-01-01

    This paper presents the design, implementation and validation of the software alignment procedure used to perform geometric calibration of the electromagnetic calorimeter with respect to the tracking system of the Spherical Neutral Detector (SND) which is used for HEP experiments at the VEPP-2000 $e^{+}e^{-}$ collider (BINP, Novosibirsk). This procedure is based on the mathematical model describing the relative calorimeter position. The parameter values are determined by minimizing a $\\chi^{2}$ function using the difference between directions reconstructed in these two subdetectors for the $e^{+}e^{-}\\rightarrow e^{+}e^{-}$ scattering data events. The results of the calibration and its application to the data and MC simulation fit the model and give an improvement of the reconstructed particle parameters. They are used already in the actual experimental data analysis and more realistic MC simulation. We think that the ideas implemented in the calibration procedure can be useful for other experiments with hete...

  8. A high-resolution lead/scintillating fiber electromagnetic calorimeter

    International Nuclear Information System (INIS)

    Electromagnetic calorimeter modules based on a uniform array of plastic scintillating fibers embedded in a lead alloy have been built and tested. Techniques have been developed to assemble large volumes of this composite material and to machine it into the tapered trapezoidal modules appropriate for modern, hermetically-sealed calorimeters with pointing geometry. Using this technique, a 300-element array of such modules has been built and instrumented. Prototypes and subsets of the larger array have been tested in electron and photon beams ranging in energy from 0.035 to 5.0 GeV. Improvements in fiber characteristics, assembly procedures, and geometrical optimization have led to substantial performance gains over previous similar detectors. The average resolution of these detectors is determined to be σ/E ≅ 6.3%/√E (GeV). The techniques of fabrication and the detector tests are described. (orig.)

  9. Development and Construction of Large Size Signal Electrodes for the ATLAS Electromagnetic Calorimeter

    CERN Document Server

    Aubert, B; Colas, Jacques; Girard, C; Jérémie, A; Jézéquel, S; Lesueur, J; Sauvage, G; Lissauer, D; Makowiecki, D S; Radeka, V; Rescia, S; Wolniewicz, K; Belymam, A; Hoummada, A; Cherif, A; Chevalley, J L; Hervás, L; Marin, C P; Fassnacht, P; Szeless, Balázs; Collot, J; Gallin-Martel, M L; Hostachy, J Y; Martin, P; Leltchouk, M; Seman, M; Dargent, P; Djama, F; Monnier, E; Olivier, C; Tisserant, S; Battistoni, G; Carminati, L; Cavalli, D; Costa, G; Delmastro, M; Fanti, M; Mandelli, L; Mazzanti, M; Perini, L; Tartarelli, F; Augé, E; Bonivento, W; Fournier, D; Puzo, P; Serin, L; de La Taille, C; Astesan, F; Canton, B; Imbault, D; Lacour, D; Rossel, F; Schwemling, P

    2005-01-01

    We describe the electric circuits (electrodes) which polarize and read out the Lead-Liquid Argon electromagnetic calorimeter for the ATLAS detector. The paper covers design and material choices of the circuits as well as their production in industry. We also show how the electrodes integrate into the calorimeter and conclude with results from groups of electrodes making up calorimeter modules.

  10. Determination of the total absorption peak in an electromagnetic calorimeter

    Science.gov (United States)

    Cheng, Jia-Hua; Wang, Zhe; Lebanowski, Logan; Lin, Guey-Lin; Chen, Shaomin

    2016-08-01

    A physically motivated function was developed to accurately determine the total absorption peak in an electromagnetic calorimeter and to overcome biases present in many commonly used methods. The function is the convolution of a detector resolution function with the sum of a delta function, which represents the complete absorption of energy, and a tail function, which describes the partial absorption of energy and depends on the detector materials and structures. Its performance was tested with the simulation of three typical cases. The accuracy of the extracted peak value, resolution, and peak area was improved by an order of magnitude on average, relative to the Crystal Ball function.

  11. Performance of the CMS Electromagnetic Calorimeter in pp collisions

    CERN Document Server

    Argiro, Stefano

    2010-01-01

    The CMS Electromagnetic Calorimeter (ECAL) is a high resolution, finely grained instrument devised to measure photons and electrons at LHC. Built of lead tungstate crystals, it will play a crucial role in the search for new physics as well as in precision measurements in the standard model. Thanks to this detector, the CMS collaboration was able to reconstruct di-photon states within minutes from the first LHC collisions. We will report on the commissioning and performance of the detector with 2009 and 2010 collision data, providing details about its calibration and synchronization, showing how well the challenging design goals were met.

  12. Determination of the total absorption peak in an electromagnetic calorimeter

    CERN Document Server

    Cheng, Jia-Hua; Lebanowski, Logan; Lin, Guey-Lin; Chen, Shaomin

    2016-01-01

    A physically-motivated function was developed to accurately determine the total absorption peak in an electromagnetic calorimeter and to overcome biases present in many commonly used methods. The function is the convolution of a detector resolution function with the sum of a delta function, which represents the complete absorption of energy, and a tail function, which describes the partial absorption of energy and depends on the detector materials and structures. Its performance was tested with the simulation of three typical cases. The accuracy of the extracted peak value, resolution, and peak area was improved by an order of magnitude on average, relative to the Crystal Ball function.

  13. Test beam results of the ATLAS electromagnetic calorimeter prototype modules

    CERN Document Server

    Maslennikov, A L

    2002-01-01

    The pre-series modules of the future ATLAS liquid argon electromagnetic calorimeter (the LHC project) have been tested in 1999-2000 with electron beams at CERN SPS. Detailed results of these tests are presented, including the performance of ATLAS-like electronics. Energy resolution of better than 9.5%/ root E (barrel) and 10.5-12.5%/ root E (end-cap) is obtained. Angular resolution measured ( asymptotically equal to 50 mrad/ root E, end-cap) also fits to physics requirements.

  14. A shower position detector inside an electromagnetic calorimeter

    International Nuclear Information System (INIS)

    We present the results of a test in an electron-hadron beam (5-90 GeV) of the prototype of a position detector. This position detector consists of proportional tubes with charge division readout, giving the position and a coarse value of the shower energy. This detector will be used in the end cap electromagnetic calorimeter (bouchon) of the UAl experiment (CERN anti pp collider). We give results on the properties of the tubes and on the development of the shower in the lead-plastic sandwich

  15. The backward end-cap for the PANDA electromagnetic calorimeter

    Science.gov (United States)

    Capozza, L.; Maas, F. E.; Noll, O.; Rodriguez Pineiro, D.; Valente, R.

    2015-02-01

    The PANDA experiment at the new FAIR facility will cover a broad experimental programme in hadron structure and spectroscopy. As a multipurpose detector, the PANDA spectrometer needs to ensure almost 4π coverage of the scattering solid angle, full and accurate multiple-particle event reconstruction and very good particle identification capabilities. The electromagnetic calorimeter (EMC) will be a key item for many of these aspects. Particle energies ranging from some MeVs to several GeVs have to be measured with a relative resolution of 1% ⊕ 2%/√E/GeV . It will be a homogeneous calorimeter made of PbWO4 crystals and will be operated at -25°C, in order to improve the scintillation light yield. With the exception of the very forward section, the light will be detected by large area avalanche photodiodes (APDs). The current pulses from the APDs will be integrated, amplified and shaped by ASIC chips which were developed for this purpose. The whole calorimeter has been designed in three sections: a forward end-cap, a central barrel and a backward end-cap (BWEC). In this contribution, a status report on the development of the BWEC is presented.

  16. ALEPH electromagnetic calorimeter performances. Detection feasibilility of Higgs boson

    International Nuclear Information System (INIS)

    In the first part of the thesis, the performance of the ALEPH electromagnetic calorimeter is discussed. The linearity of the response and the energy resolution are studied using data taken with a calorimeter module exposed to electron beams of 10, 25 and 50 GeV. A small non-linearity dominated by saturation effects is observed. The calorimeter responses to electrons and non-showering particles are compared using pions and muon data. Parametrisations of the longitudinal shape of the electron showers, and of fluctuation of their shape are established in the energy range 20 MeV to 50 GeV, from the experimental data and detailed EGS simulations. In the second part, the feasibility of the Higgs boson detection by ALEPH is investigated. The reaction considered is e+e- → e+e- Ho at the Zo pole assuming a Higgs mass between 12 and 50 GeV. The background is mainly due to hadronic Zo decays. The signal can be discriminated from the background by a series of kinematic cuts established by studying simulated events. Applied together with the electron identification criteria, the cuts allow to identify the e+e- pair and to reconstruct the Higgs mass

  17. Online feature extraction for the PANDA electromagnetic calorimeter

    Energy Technology Data Exchange (ETDEWEB)

    Guliyev, Elmaddin; Tambave, Ganesh; Kavatsyuk, Myroslav; Loehner, Herbert [KVI, University of Groningen (Netherlands); Collaboration: PANDA-Collaboration

    2011-07-01

    Resonances in the charmonium mass region will be studied in antiproton annihilations at FAIR with the multi-purpose PANDA spectrometer providing measurements of electromagnetic signals in a wide dynamic range. The Sampling ADC (SADC) readout of the Electromagnetic Calorimeter (EMC) will allow to realize online hit-detection on the single-channel level and to derive time and energy information. A digital filtering and feature-extraction algorithm was developed and implemented in VHDL code for the online application in a commercial SADC. We discuss the readout scheme, the program logic, the precise signal amplitude detection with phase correction at low sampling frequencies, and the usage of a double moving-window deconvolution filter for the pulse-shape restoration. Such double filtering allows to operate the EMC at much higher rates and to minimize the amount of pile-up events.

  18. Online feature extraction for the PANDA electromagnetic calorimeter

    International Nuclear Information System (INIS)

    Resonances in the charmonium mass region will be studied in antiproton annihilations at FAIR with the multi-purpose PANDA spectrometer providing measurements of electromagnetic signals in a wide dynamic range. The Sampling ADC (SADC) readout of the Electromagnetic Calorimeter (EMC) will allow to realize online hit-detection on the single-channel level and to derive time and energy information. A digital filtering and feature-extraction algorithm was developed and implemented in VHDL code for the online application in a commercial SADC. We discuss the readout scheme, the program logic, the precise signal amplitude detection with phase correction at low sampling frequencies, and the usage of a double moving-window deconvolution filter for the pulse-shape restoration. Such double filtering allows to operate the EMC at much higher rates and to minimize the amount of pile-up events.

  19. Interactions of 200 GeV muons in an electromagnetic streamer tube calorimeter

    International Nuclear Information System (INIS)

    We have investigated the response of an electromagnetic streamer tube calorimeter to 200 GeV muons. Muons undergo electromagnetic interactions in the absorber plates and produce electrons, photons or electron pairs the energy of which is measured by the calorimeter. Occasionally also catastrophic energy losses occur, so that in these very rare cases muons culd even be misinterpreted as electrons. (orig.)

  20. Interactions of 200 GeV muons in an electromagnetic streamer tube calorimeter

    Energy Technology Data Exchange (ETDEWEB)

    Baumgart, R.; Grupen, C.; Meyer, H.J.; Schaefer, U.; Werthenbach, R.

    1987-07-15

    We have investigated the response of an electromagnetic streamer tube calorimeter to 200 GeV muons. Muons undergo electromagnetic interactions in the absorber plates and produce electrons, photons or electron pairs the energy of which is measured by the calorimeter. Occasionally also catastrophic energy losses occur, so that in these very rare cases muons culd even be misinterpreted as electrons.

  1. Determination of shower central position in laterally segmented lead-fluoride electromagnetic calorimeters

    CERN Document Server

    Mazouz, M; Voutier, E

    2015-01-01

    The spatial resolution of laterally segmented electromagnetic calorimeters is studied on the basis of Monte-Carlo simulations worked-out for lead fluoride material. Parametrization of the relative resolution is proposed and optimized in terms of the energy of incoming particles and the elementary size of the calorimeter blocks. A new fit algorithm method is proposed that improves spatial resolution at high energies, and provides guidance for the design optimization of electromagnetic calorimeters.

  2. Performance of the AMS-02 Electromagnetic Calorimeter in Space

    International Nuclear Information System (INIS)

    AMS-02(Alpha Magnetic Spectrometer) is an high energy particle detector developed to operate on the International Space Station. AMS-02 was installed on ISS on May 2011 and is expected to operate for 10-20 years collecting about 160-320 billions of events. The main goals of the experiment are the detection of primordial antimatter and dark matter by studying spectra and flux of different cosmic ray components (protons, electrons, nuclei, positrons, antiprotons, gamma rays, etc) in the high energy range (1-2000 GeV). Identification of electrons, positrons and photons is provided by the Electromagnetic Calorimeter (ECAL), a fine grained lead-scintillating fibers sampling calorimeter that allows for a precise three-dimensional imaging of the longitudinal and lateral shower development. It provides an excellent reconstruction of electromagnetic shower energy and a highly efficient rejection of the hadronic background. Thanks to the 3D shower reconstruction capability, ECAL allows a stand-alone determination of the incoming particle direction, with unprecedented angular resolution. As a result, ECAL is able to identify high energy photons coming from galactic or extragalactic sources

  3. Performance of the ATLAS electromagnetic calorimeter barrel module 0

    International Nuclear Information System (INIS)

    The construction and performance of the barrel pre-series module 0 of the future ATLAS electromagnetic calorimeter at the LHC is described. The signal reconstruction and performance of ATLAS-like electronics has been studied. The signal to noise ratio for muons has been found to be 7.11±0.07. An energy resolution of better than 9.5% GeV1/2/√E (sampling term) has been obtained with electron beams of up to 245 GeV. The uniformity of the response to electrons in an area of ΔηxΔphi=1.2x0.075 has been measured to be better than 0.8%

  4. Tungsten Scintillating Fibers Electromagnetic Calorimeters for sPHENIX upgrade

    Science.gov (United States)

    Li, Siyang; Loggins, Vera; Phipps, Michael; Sickles, Anne

    2015-10-01

    sPHENIX, a planned new detector at RHIC, features electromagnetic and hadronic calorimetry that covers | η| design is optimized for the study of jets in heavy ion collisions. The design includes a tungsten fiber EmCal that is made out of a tower array of plastic scintillating fiber embedded inside a mixture of tungsten powder and epoxy. For this calorimeter, silicon photomultipliers will be attached at the end of the module to convert scintillated optical photons into electrical signals. The sPHENIX group at Illinois is currently making samples of these modules to study the production process and achievable density. In addition, we have set up a silicon photomultiplier read out test system which will be used to evaluate the module performance. sPHENIX collaboration and Brookhaven National Laboratory.

  5. Performance of the ATLAS electromagnetic calorimeter barrel module 0

    CERN Document Server

    Aubert, Bernard; Alexa, C; Astesan, F; Augé, E; Aulchenko, V M; Ballansat, J; Barreiro, F; Barrillon, P; Battistoni, G; Bazan, A; Beaugiraud, B; Beck-Hansen, J; Belhorma, B; Belorgey, J; Belymam, A; Ben-Mansour, A; Benchekroun, D; Benchouk, C; Bernard, R; Bertoli, W; Boniface, J; Bonivento, W; Bourdarios, C; Bremer, J; Breton, D; Bán, J; Camard, A; Canton, B; Carminati, L; Cartiglia, N; Cavalli, D; Chalifour, M; Chekhtman, A; Chen, H; Cherkaoui, R; Chevalley, J L; Chollet, F; Citterio, M; Clark, A; Cleland, W; Clément, C; Colas, Jacques; Collot, J; Costa, G; Cros, P; Cunitz, H; de Saintignon, P; Del Peso, J; Delebecque, P; Delmastro, M; Di Ciaccio, Lucia; Dinkespiler, B; Djama, F; Dodd, J; Driouichi, C; Dumont-Dayot, N; Duval, P Y; Dzahini, D; Efthymiopoulos, I; Egdemir, J; El-Kacimi, M; El-Mouahhidi, Y; Engelmann, R; Ernwein, J; Falleau, I; Fanti, M; Farrell, J; Fassnacht, P; Ferrari, A; Fichet, S; Fournier, D; Gallin-Martel, M L; Gara, A; García, G; Gaumer, O; Ghazlane, H; Ghez, P; Gianotti, F; Girard, C; Gordon, H; Gouanère, M; Guilhem, G; Hackenburg, B; Hakimi, M; Hassani, S; Henry-Coüannier, F; Hervás, L; Hinz, L; Hoffman, A; Hoffman, J; Hostachy, J Y; Hoummada, A; Hubaut, F; Idrissi, A; Imbault, D; Jacquier, Y; Jérémie, A; Jevaud, M; Jézéquel, S; Kambara, H; Karst, P; Kazanin, V; Kierstead, J A; Kolachev, G M; Kordas, K; de La Taille, C; Labarga, L; Lacour, D; Lafaye, R; Laforge, B; Lanni, F; Le Coroller, A; Le Dortz, O; Le Maner, C; Le Van-Suu, A; Le Flour, T; Leite, M; Leltchouk, M; Lesueur, J; Lissauer, D; Lund-Jensen, B; Lundqvist, J M; Ma, H; Macé, G; Makowiecki, D S; Malychev, V; Mandelli, L; Mansoulié, B; Marin, C P; Martin, D; Martin, L; Martin, O; Martin, P; Maslennikov, A L; Massol, N; Mazzanti, M; McCarthy, R; McDonald, J; Megner, L; Merkel, B; Mirea, A; Moneta, L; Monnier, E; Moynot, M; Muraz, J F; Nagy, E; Negroni, S; Neukermans, L; Nicod, D; Nikolic-Audit, I; Noppe, J M; Ohlsson-Malek, F; Olivier, C; Orsini, F; Pailler, P; Parrour, G; Parsons, J A; Pearce, M; Perini, L; Perrodo, P; Perrot, G; Pétroff, P; Poggioli, Luc; Pospelov, G E; Pralavorio, Pascal; Prast, J; Przysiezniak, H; Puzo, P; Radeka, V; Rahm, David Charles; Rajagopalan, S; Raymond, M; Renardy, J F; Repetti, B; Rescia, S; Resconi, S; Riccadona, X; Richer, J P; Rijssenbeek, M; Rodier, S; Rossel, F; Rousseau, D; Rydström, S; Saboumazrag, S; Sauvage, D; Sauvage, G; Schilly, P; Schwemling, P; Schwindling, J; Seguin-Moreau, N; Seidl, W; Seman, M; Serin, L; Shousharo, A; Simion, S; Sippach, W; Snopkov, R; Steffens, J; Stroynowski, R; Stumer, I; Taguet, J P; Takai, H; Talyshev, A A; Tartarelli, F; Teiger, J; Thion, J; Tikhonov, Yu A; Tisserant, S; Tocut, V; Tóth, J; Veillet, J J; Vossebeld, Joost Herman; Vuillemin, V; Wielers, M; Willis, W J; Wingerter-Seez, I; Ye, J; Yip, K; Zerwas, D; Zitoun, R; Zolnierowski, Y

    2003-01-01

    The construction and performance of the barrel pre-series module 0 of the future ATLAS electromagnetic calorimeter at the LHC is described. The signal reconstruction and performance of ATLAS-like electronics has been studied. The signal to noise ratio for muons has been found to be 7.11+-0.07. An energy resolution of better than 9.5% GeV^1/2/sqrt{E} (sampling term) has been obtained with electron beams of up to 245GeV. The uniformity of the response to electrons in an area of Delta_eta x Delta_phi = 1.2 x 0.075 has been measured to be better than 0.8%.

  6. Construction techniques of the high resolution lead / scintillating fibre electromagnetic calorimeter for the KLOE experiment

    International Nuclear Information System (INIS)

    The electromagnetic calorimeter of the KLOE experiment is a lead-scintillating fibre sampling device. This calorimeter is arranged as a 'barrel', closed at both ends with an 'end-cap'. The barrel consists in 24 modules defining a cylinder, 4.3 long, with 4 m inner diameter. Each end-cap consists of 32 modules running vertically along the chords of the circle inscribed into the barrel. In this paper the calorimeter construction techniques are described

  7. Qualification procedure of the electromagnetic calorimeter of the ATLAS detector

    International Nuclear Information System (INIS)

    LHC is the next collider based at CERN in Europe. The purpose of this machine is the Higgs boson and SUSY particles search. The detectors must have an excellent electromagnetic calorimetry to measure electron and photon energy. To maximize the signal to noise ratio for a low mass Higgs, it is fundamental to obtain a constant term as small as possible. LAPP is participating in the construction of the liquid argon electromagnetic calorimeter of the ATLAS collaboration. This technology is well adapted to the LHC experimental conditions. A systematic procedure to qualify the modules of this detector is an essential step to guarantee a 0,7% constant term, which is the collaboration objective. The procedure detailed in this thesis consists of quality monitoring during mechanical assembly and of a set of electrical tests such as electrical continuity, cell and cross-talk capacitance measurement, and high-voltage behaviour. For the whole test, it has been necessary to develop dedicated electronic cards, to develop measurement methods, and the whole operation software. Making the procedure automatic will guarantee the quality of each module during assembly, cabling, and test in liquid argon. (author)

  8. Drift time measurement in the ATLAS liquid argon electromagnetic calorimeter using cosmic muons

    DEFF Research Database (Denmark)

    Aad..[], G.; Dam, Mogens; Hansen, Jørgen Beck; Hansen, John Renner; Hansen, Jørn Dines; Hansen, Peter Henrik; Xella, Stefania; Klinkby, Esben Bryndt; Nilsson, Björn Stefan

    2010-01-01

    The ionization signals in the liquid argon of the ATLAS electromagnetic calorimeter are studied in detail using cosmic muons. In particular, the drift time of the ionization electrons is measured and used to assess the intrinsic uniformity of the calorimeter gaps and estimate its impact on the...

  9. Investigation of the avalanche photodiodes for the CMS electromagnetic calorimeter operated at high gain

    CERN Document Server

    Deiters, K; Godinovic, N; Ingram, Q; Longo, E; Montecchi, M; Musienko, Yu V; Nicol, S; Patel, B; Renker, D; Reucroft, S; Rusack, R W; Sakhelashvili, T M; Singovsky, A V; Soric, I; Swain, J D; Vikas, P

    2001-01-01

    Avalanche photodiodes (APD) with improved characteristics were developed by Hamamatsu Photonics for the electromagnetic calorimeter of the CMS experiment. This report presents measurements of the latest generation of APDs, which are capable to operate at high gains (~2000). (5 refs).

  10. Front-end electronics for PWO-based PHOS calorimeter of ALICE

    International Nuclear Information System (INIS)

    The electromagnetic Photon Spectrometer (PHOS) of ALICE consists of five modules with 56x64 PWO crystals, operated at -25 oC. Glued to each crystal are APD diodes which amplify a lightyield of 4.4 photoelectrons/MeV, followed by charge-sensitive pre-amplifiers with a charge conversion gain of ca. 1 V/pC. We describe our new 32-channel shaper/digitizer and readout electronics for gain-programmable photodiodes. These Front-End Electronics (FEE) cards are installed below the crystals in an isolated warm volume in geometrical correspondence to 2x16 crystal rows per card. With a total detector capacitance of 100 pF and a noise level of 3 MeV, the FEEs cover a 14 bit dynamic range from 5 MeV to 80 GeV. The low noise level is achieved by operating the APDs and preamplifiers at low temperature and by applying a relatively long shaping time of 1 μs. The offline timing resolution, obtained via a Gamma-2 fit is less than 2 ns. The second-order, dual-gain shapers produce semi-Gaussian output for 10 bit ADCs with embedded multi-event buffers. A Readout Control Unit (RCU) masters data readout with address-mapped access to the event-buffers and controls registers via a custom bus which interconnects up to 14 FEE cards. Programmable bias voltage controllers on the FEE cards allow for very precise gain adjustment of each individual APD. Being co-designed with the TRU trigger cards, each FEE card generates eight fast signal sums (2x2 crystals) as input to the TRU. FPGA-based algorithms generate level-0 and level-1 trigger decisions at 40 MHz and allow PHOS also to operate in self-triggered mode. Inside each PHOS module there are 112 FEE and 8 TRU cards which dissipate ca. 1 kW heat which is extracted via a water cooling system

  11. 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.

  12. Fast Electromagnetic Calorimeters for the New Muon g-2 Experiment

    Science.gov (United States)

    Hertzog, David

    2012-10-01

    The Intensity Frontier era brings a host of challenges for detector systems that must both accumulate data at very high rates while also maintaining an unusually high level of performance stability to suppress systematic uncertainties. The new muon g-2 experiment at Fermilab is typical of a group of next-generation measurements that also includes muon-to-electron conversion and rare kaon decay experiments. A common theme is detectors that must endure very high rates embedded in strong magnetic fields. I will focus on our design of the g-2 electromagnetic calorimeters, which must be compact, very fast, and be placed inside the highly uniform muon storage ring magnetic field. No magnetic materials can be used and stringent constraints exist on local current-generating electronics. We examined home-built W/SciFi detectors, PbF2 crystals and a custom undoped PbWO4 crystal using the Fermilab test beam facility. Very fast PMTs and on-board, large-area silicon photomultipliers (SiPMs) were used for readout options. The leading design is based on PbF2, which produces very short pure Cherenkov light pulses that must be optimally coupled to SiPMs directly placed on the downstream surface. Custom electronics for the candidate SiPM arrays has been designed to preserve the intrinsic fast pulse signal. I will report on our test beam and lab results and our iterations with SiPM devices and electronics.

  13. Evaluating vacuum phototriodes designed for the PANDA electromagnetic calorimeter

    Science.gov (United States)

    Makónyi, K.; Marcks von Würtemberg, K.; Tegnér, P.-E.; Hansen, K.; Isaksson, L.; Lundin, M.; Schröder, B.; Balkeståhl, L.; Fransson, K.; Johansson, T.; Rosenbaum, C.; Wolke, M.; Erni, W.; Keshelashvili, I.; Krushe, B.

    2014-11-01

    In this work properties of a vacuum phototriode (VPT) and preamplifier unit designed for the electromagnetic calorimeter of the PANDA experiment being built at FAIR are investigated. With the use of lead tungstate and lanthanium bromide scintillators the VPT properties are studied at low photon energies, from tens of keV in the lanthanium bromide measurements and between 10 MeV and 60 MeV in the lead tungstate measurements. At these energies the noise of the VPT unit can be expected to influence its performance significantly. It is shown that the noise contribution to the measured energy resolution, under optimal conditions, is consistent with a fluctuation of (one standard deviation) approximately 200 electrons at the VPT anode. For a lead tungstate crystal this is equivalent to a noise of 1.2 MeV. For lanthanium bromide this makes it possible to use VPTs for gamma ray spectroscopy above a few hundreds of keV without noticeable effects on the energy resolution compared to measurements with a standard photomultiplier.

  14. Fast signal analysis for the PANDA electromagnetic calorimeter

    International Nuclear Information System (INIS)

    Antiproton-proton annihilations at the future FAIR facility at Darmstadt, Germany, will allow testing the theory of strong interactions, QCD, in the non-perturbative regime. The PANDA detector will be installed in the antiproton storage ring HESR providing an intense high-resolution antiproton beam with dense internal targets. The Electromagnetic Calorimeter (EMC) is a crucial component to provide high sensitivity for studies of charm-quark mesons, glueballs and hybrid states. The EMC employs fast bright PWO scintillation crystals with Large-Area Avalanche Photo Diodes (LAAPD) as photosensors. Low-noise low-power preamplifiers were developed suitable for the expected high rates and the required large dynamic range of photon energy deposition between 1 MeV and 12 GeV. Measurements were performed on signals from cooled PWO crystals equipped with LAAPD and either discrete or ASIC preamplifiers, recorded by a fast sampling ADC. Sampling rate and ADC resolution have been determined for achieving the required energy and timing performance. The concept of the EMC front-end electronics is discussed, including a fast feature extraction algorithm. Results of recent prototype studies are presented.

  15. Simulations of the electromagnetic calorimeter in the presence of magnetic field for the FCChh

    CERN Document Server

    Matas, Marek

    2016-01-01

    This work was focused on studying the properties of the electromagnetic calorimeter for the Future Circular Collider (FCC). FCC is an accelerator that will possibly be built in the 2040s-2050s. Its circumference would be 100 km with the center of mass energy 100 TeV in proton-proton collisions. Its detector will consist of the tracker, cryostat, electromagnetic calorimeter (EMCal), hadronic calorimeter (HCal), magnets and muon chambers. In this work, we shall study the EMCal and its properties. One of the properties of the environment that this particular detector will have to face is the presence of a strong magnetic field in the volume of the calorimeter. Studies carried out in this work focused on addressing the effects that the magnetic field will have on the electromagnetic shower evolution.

  16. Simulations of the electromagnetic calorimeter in the presence of magnetic eld for the FCChh

    CERN Document Server

    Matas, Marek

    2016-01-01

    This work was focused on studying the properties of the electromagnetic calorimeter for the Future Circular Collider (FCC) [1]. FCC is an accelerator that will possibly be built in the 2040s-2050s. Its circumference would be 100 km with the center of mass energy ps=100TeV in proton-proton collisions. Detectors used to record FCC collisions will consist of the tracker, cryostat, electromagnetic calorimeter (EMCal), hadronic calorimeter (HCal) and muon chambers. In this work, we shall study the EMCal and its properties. One of the properties of the environment that this particular detector will have to face is the presence of a strong magnetic eld in the volume of the calorimeter. Studies carried out in this work are preliminary studies focused on addressing the eects that the magnetic eld will have on the electromagnetic shower evolution.

  17. Results from a new combined test of an electromagnetic liquid argon calorimeter with a hadronic scintillating-tile calorimeter

    International Nuclear Information System (INIS)

    A new combined test of an electromagnetic liquid argon accordion calorimeter and a hadronic scintillating-tile calorimeter was carried out at the CERN SPS. These devices are prototypes of the barrel calorimeter of the future ATLAS experiment at the LHC. The energy resolution of pions in the energy range from 10 to 300 GeV at an incident angle θ of about 12 deg. is well described by the expression σ/E=((41.9±1.6)%/√E+(1.8±0.1)%)+(1.8±0.1)/E, where E is in GeV. The response to electrons and muons was evaluated. Shower profiles, shower leakage and the angular resolution of hadronic showers were also studied. Results are compared with those from the previous beam test

  18. Results from a combined test of an electromagnetic liquid argon calorimeter with a hadronic scintillating-tile calorimeter

    CERN Document Server

    Ajaltouni, Ziad J; Alifanov, A; Amaral, P; Ambrosini, G; Amorim, A; Anderson, K J; Astvatsaturov, A R; Aubert, Bernard; Augé, E; Autiero, D; Azuelos, Georges; Badaud, F; Baisin, L; Battistoni, G; Bazan, A; Bee, C P; Bellettini, Giorgio; Berglund, S R; Berset, J C; Blaj, C; Blanchot, G; Blucher, E; Bogush, A A; Bohm, C; Boldea, V; Borisov, O N; Bosman, M; Bouhemaid, N; Brette, P; Bromberg, C; Brossard, M; Budagov, Yu A; Buono, S; Calôba, L P; Camin, D V; Canton, B; Casado, M P; Cavalli, D; Cavalli-Sforza, M; Cavasinni, V; Chadelas, R; Chase, Robert L; Chekhtman, A; Chevaleyre, J C; Chevalley, J L; Chirikov-Zorin, I E; Chlachidze, G; Chollet, J C; Cobal, M; Cogswell, F; Colas, Jacques; Collot, J; Cologna, S; Constantinescu, S; Costa, G; Costanzo, D; Cozzi, L; Crouau, M; Dargent, P; Daudon, F; David, M; Davidek, T; Dawson, J; De, K; de La Taille, C; Del Prete, T; Depommier, P; de Saintignon, P; De Santo, A; Dinkespiler, B; Di Girolamo, B; Dita, S; Dolejsi, J; Dolezal, Z; Downing, R; Dugne, J J; Duval, P Y; Dzahini, D; Efthymiopoulos, I; Errede, D; Errede, S; Etienne, F; Evans, H; Fassnacht, P; Fedyakin, N N; Ferrari, A; Ferreira, P; Ferrer, A; Flaminio, Vincenzo; Fouchez, D; Fournier, D; Fumagalli, G; Gallas, E J; Gaspar, M; Gianotti, F; Gildemeister, O; Gingrich, D M; Glagolev, V V; Golubev, V B; Gómez, A; González, J; Gordon, H A; Grabskii, V; Hakopian, H H; Haney, M; Hellman, S; Henriques, A; Holmgren, S O; Honoré, P F; Hostachy, J Y; Huston, J; Ivanyushenkov, Yu M; Jézéquel, S; Johansson, E K; Jon-And, K; Jones, R; Juste, A; Kakurin, S; Karapetian, G V; Karyukhin, A N; Khokhlov, Yu A; Klioukhine, V I; Kolomoets, V; Kopikov, S V; Kostrikov, M E; Kovtun, V E; Kukhtin, V V; Kulagin, M; Kulchitskii, Yu A; Laborie, G; Lami, S; Lapin, V; Lebedev, A; Lefebvre, M; Le Flour, T; Leitner, R; León-Florián, E; Leroy, C; Le Van-Suu, A; Li, J; Liba, I; Linossier, O; Lokajícek, M; Lomakin, Yu F; Lomakina, O V; Lund-Jensen, B; Mahout, G; Maio, A; Malyukov, S N; Mandelli, L; Mansoulié, B; Mapelli, Livio P; Marin, C P; Marroquin, F; Martin, L; Mazzanti, M; Mazzoni, E; Merritt, F S; Michel, B; Miller, R; Minashvili, I A; Miotto, A; Miralles, L; Mnatzakanian, E A; Monnier, E; Montarou, G; Mornacchi, Giuseppe; Muanza, G S; Nagy, E; Némécek, S; Nessi, Marzio; Nicoleau, S; Noppe, J M; Olivetto, C; Orteu, S; Padilla, C; Pallin, D; Pantea, D; Parrour, G; Pereira, A; Perini, L; Perlas, J A; Pétroff, P; Pilcher, J E; Pinfold, James L; Poggioli, Luc; Poirot, S; Polesello, G; Price, L; Protopopov, Yu; Proudfoot, J; Pukhov, O; Radeka, V; Rahm, David Charles; Reinmuth, G; Renardy, J F; Renzoni, G; Resconi, S; Richards, R; Riu, I; Romanov, V; Ronceux, B; Rumyantsev, V; Rusakovitch, N A; Sala, P R; Sanders, H; Sauvage, G; Savard, P; Savoy-Navarro, Aurore; Sawyer, L; Says, L P; Schaffer, A C; Scheel, C V; Schwemling, P; Schindling, J; Seguin-Moreau, N; Seixas, J M; Selldén, B; Seman, M; Semenov, A A; Senchyshyn, V G; Serin, L; Shchelchkov, A S; Shevtsov, V P; Shochet, M J; Sidorov, V; Simaitis, V J; Simion, S; Sissakian, A N; Solodkov, A A; Sonderegger, P; Soustruznik, K; Stanek, R; Starchenko, E A; Stephani, D; Stephens, R; Studenov, S; Suk, M; Surkov, A; Tang, F; Tardell, S; Tas, P; Teiger, J; Teubert, F; Thaler, J J; Tisserant, S; Tokár, S; Topilin, N D; Trka, Z; Turcot, A S; Turcotte, M; Valkár, S; Vartapetian, A H; Vazeille, F; Vichou, I; Vinogradov, V; Vorozhtsov, S B; Vuillemin, V; Wagner, D; White, Alan R; Wingerter-Seez, I; Yamdagni, N; Yarygin, G; Yosef, C; Zaitsev, A; Zdrazil, M; Zitoun, R; Zolnierowski, Y

    1996-01-01

    The first combined test of an electromagnetic liquid argon accordion calorimeter and a hadronic scintillating-tile calorimeter was carried out at the CERN SPS. These devices are prototypes of the barrel calorimeter of the future ATLAS experiment at the LHC. The energy resolution of pions in the energy range from 20 to 300~GeV at an incident angle $\\theta$ of about 11$^\\circ$ is well-described by the expression $\\sigma/E = ((46.5 \\pm 6.0)\\%/\\sqrt{E} +(1.2 \\pm 0.3)\\%) \\oplus (3.2 \\pm 0.4)~\\mbox{GeV}/E$. Shower profiles, shower leakage, and the angular resolution of hadronic showers were also studied.

  19. Results from a new combined test of an electromagnetic liquid argon calorimeter with a hadronic scintillating-tile calorimeter

    CERN Document Server

    Akhmadaliev, S Z; Amaral, P; Ambrosini, G; Amorim, A; Anderson, K; Andrieux, M L; Aubert, Bernard; Augé, E; Badaud, F; Baisin, L; Barreiro, F; Battistoni, G; Bazan, A; Bazizi, K; Bee, C P; Belorgey, J; Belymam, A; Benchekroun, D; Berglund, S R; Berset, J C; Blanchot, G; Bogush, A A; Bohm, C; Boldea, V; Bonivento, W; Borgeaud, P; Borisov, O N; Bosman, M; Bouhemaid, N; Breton, D; Brette, P; Bromberg, C; Budagov, Yu A; Burdin, S V; Calôba, L P; Camarena, F; Camin, D V; Canton, B; Caprini, M; Carvalho, J; Casado, M P; Cases, R; Castillo, M V; Cavalli, D; Cavalli-Sforza, M; Cavasinni, V; Chadelas, R; Chalifour, M; Chekhtman, A; Chevalley, J L; Chirikov-Zorin, I E; Chlachidze, G; Chollet, J C; Citterio, M; Cleland, W E; Clément, C; Cobal, M; Cogswell, F; Colas, Jacques; Collot, J; Cologna, S; Constantinescu, S; Costa, G; Costanzo, D; Coulon, J P; Crouau, M; Dargent, P; Daudon, F; David, M; Davidek, T; Dawson, J; De, K; Delagnes, E; de La Taille, C; Del Peso, J; Del Prete, T; de Saintignon, P; Di Girolamo, B; Dinkespiler, B; Dita, S; Djama, F; Dodd, J; Dolejsi, J; Dolezal, Z; Downing, R; Dugne, J J; Duval, P Y; Dzahini, D; Efthymiopoulos, I; Errede, D; Errede, S; Etienne, F; Evans, H; Eynard, G; Farida, F; Fassnacht, P; Fedyakin, N N; Fernández de Troconiz, J; Ferrari, A; Ferrer, A; Flaminio, Vincenzo; Fournier, D; Fumagalli, G; Gallas, E J; García, G; Gaspar, M; Gianotti, F; Gildemeister, O; Glagolev, V; Glebov, V Yu; Gómez, A; González, V; González de la Hoz, S; Gordeev, A; Gordon, H A; Grabskii, V; Graugès-Pous, E; Grenier, P; Hakopian, H H; Haney, M; Hébrard, C; Henriques, A; Henry-Coüannier, F; Hervás, L; Higón, E; Holmgren, S O; Hostachy, J Y; Hoummada, A; Huet, M; Huston, J; Imbault, D; Ivanyushenkov, Yu M; Jacquier, Y; Jézéquel, S; Johansson, E K; Jon-And, K; Jones, R; Juste, A; Kakurin, S; Karst, P; Karyukhin, A N; Khokhlov, Yu A; Khubua, J I; Klioukhine, V I; Kolachev, G M; Kolomoets, V; Kopikov, S V; Kostrikov, M E; Kovtun, V E; Kozlov, V; Krivkova, P; Kukhtin, V V; Kulagin, M; Kulchitskii, Yu A; Kuzmin, M V; Labarga, L; Laborie, G; Lacour, D; Lami, S; Lapin, V; Le Dortz, O; Lefebvre, M; Le Flour, T; Leitner, R; Leltchouk, M; Le Van-Suu, A; Li, J; Liapis, C; Linossier, O; Lissauer, D; Lobkowicz, F; Lokajícek, M; Lomakin, Yu F; Lomakina, O V; López-Amengual, J M; Lottin, J P; Lund-Jensen, B; Lundqvist, J M; Maio, A; Makowiecki, D S; Malyukov, S N; Mandelli, L; Mansoulié, B; Mapelli, Livio P; Marin, C P; Marrocchesi, P S; Marroquin, F; Martin, L; Martin, O; Martin, P; Maslennikov, A M; Massol, N; Mazzanti, M; Mazzoni, E; Merritt, F S; Michel, B; Miller, R; Minashvili, I A; Miralles, L; Mirea, A; Mnatzakanian, E A; Monnier, E; Montarou, G; Mornacchi, Giuseppe; Mosidze, M D; Moynot, M; Muanza, G S; Nagy, E; Nayman, P; Némécek, S; Nessi, Marzio; Nicod, D; Nicoleau, S; Niculescu, M; Noppe, J M; Onofre, A; Pallin, D; Pantea, D; Paoletti, R; Park, I C; Parrour, G; Parsons, J; Pascual, J I; Pereira, A; Perini, L; Perlas, J A; Perrodo, P; Petroff, P; Pilcher, J E; Pinhão, J; Plothow-Besch, Hartmute; Poggioli, Luc; Poirot, S; Price, L; Protopopov, Yu; Proudfoot, J; Pukhov, O; Puzo, P; Radeka, V; Rahm, David Charles; Reinmuth, G; Renardy, J F; Renzoni, G; Rescia, S; Resconi, S; Richards, R; Richer, J P; Riu, I; Roda, C; Roldán, J; Romance, J B; Romanov, V; Romero, P; Rusakovitch, N A; Sala, P R; Sanchis, E; Sanders, H; Santoni, C; Santos, J; Sauvage, D; Sauvage, G; Savoy-Navarro, Aurore; Sawyer, L; Says, L P; Schaffer, A C; Schwemling, P; Schwindling, J; Seguin-Moreau, N; Seidl, W; Seixas, J M; Selldén, B; Seman, M; Semenov, A A; Senchyshyn, V G; Serin, L; Shaldaev, E; Shchelchkov, A S; Shochet, M J; Sidorov, V; Silva, J; Simaitis, V J; Simion, S; Sissakian, A N; Soloviev, I V; Snopkov, R; Söderqvist, J; Solodkov, A A; Sonderegger, P; Soustruznik, K; Spanó, F; Spiwoks, R; Stanek, R; Starchenko, E A; Stavina, P; Stephens, R; Studenov, S; Suk, M; Surkov, A; Sykora, I; Taguet, J P; Takai, H; Tang, F; Tardell, S; Tas, P; Teiger, J; Teubert, F; Thaler, J J; Thion, J; Tikhonov, Yu A; Tisserand, V; Tisserant, S; Tokar, S; Topilin, N D; Trka, Z; Turcotte, M; Valkár, S; Varanda, M J; Vartapetian, A H; Vazeille, F; Vichou, I; Vincent, P; Vinogradov, V; Vorozhtsov, S B; Vuillemin, V; Walter, C; White, A; Wielers, M; Wingerter-Seez, I; Wolters, H; Yamdagni, N; Yarygin, G; Yosef, C; Zaitsev, A; Zitoun, R; Zolnierowski, Y

    2000-01-01

    A new combined test of an electromagnetic liquid argon accordion calorimeter and a hadronic scintillating-tile calorimeter was carried out at the CERN SPS. These devices are prototypes of the barrel calorimeter of the future ATLAS experiment at the LHC. The energy resolution of pions in the energy range from 10 to 300 GeV at an incident angle theta of about 12 degrees is well described by the expression sigma /E=((41.9+or-1.6)%/ square root E+(1.8+or-0.1)%)(+) (1.8+or-0.1)/E, where E is in GeV. The response to electrons and muons was evaluated. Shower profiles, shower leakage and the angular resolution of hadronic showers were also studied. Results are compared with those from the previous beam test. (22 refs).

  20. STAR electromagnetic calorimeter R ampersand D progress report, 1 October 1992--31 August 1993

    International Nuclear Information System (INIS)

    A lead-scintillator sampling electromagnetic calorimeter (EMC) is planned as an upgrade to the STAR detector for the RHIC Accelerator at Brookhaven National Laboratory (BNL). Considerable work on the conceptual design of the calorimeter, and related interfacing issues with the solenoids magnet and the time projection chamber (TPC) subsystems of STAR occurred in the period 1 October 1992 to 31 August 1993 (FY 1993). This report documents and summarizes the conclusions and progress from this work

  1. A sampling ADC data acquisition system for the electromagnetic calorimeters of COMPASS

    Energy Technology Data Exchange (ETDEWEB)

    Mann, Alexander; Angerer, Heinz; Konorov, Igor; Kraemer, Markus; Paul, Stephan [Physik-Department E18, Technische Universitaet, Muenchen (Germany)

    2009-07-01

    For the readout of the two electromagnetic calorimeters of the two stage COMPASS spectrometer at CERN, a sampling ADC (SADC) based data acquisition system was developed. The shaped photomultiplier signals are continuously digitized with 80 MHz and processed within field programmable gate arrays (FPGAs). The FPGAs implement zero suppression, latency buffering and provide an option to derive online calorimeter trigger decisions. In total, 4704 calorimeter channels are currently read by two different SADC module types with 10 bit and 12 bit resolution, respectively. With modified FPGA firmware, the same modules are also used in other applications, e.g. for medical imaging (PET) and ultracold neutron experiments.

  2. A sampling ADC data acquisition system for the electromagnetic calorimeters of COMPASS

    International Nuclear Information System (INIS)

    For the readout of the two electromagnetic calorimeters of the two stage COMPASS spectrometer at CERN, a sampling ADC (SADC) based data acquisition system was developed. The shaped photomultiplier signals are continuously digitized with 80 MHz and processed within field programmable gate arrays (FPGAs). The FPGAs implement zero suppression, latency buffering and provide an option to derive online calorimeter trigger decisions. In total, 4704 calorimeter channels are currently read by two different SADC module types with 10 bit and 12 bit resolution, respectively. With modified FPGA firmware, the same modules are also used in other applications, e.g. for medical imaging (PET) and ultracold neutron experiments.

  3. Beam test results of a high-granularity tile/fiber electromagnetic calorimeter

    International Nuclear Information System (INIS)

    A prototype sampling electromagnetic calorimeter (17.1 radiation lengths) for future linear collider experiments was built, using 4cmx4cmx1mm plastic scintillator tiles and 4 mm-thick lead absorber. Wavelength-shifting fibers were used to guide the scintillation light into multi-anode photo-multiplier tubes. The calorimeter was tested at the beam test facility of the High Energy Accelerator Research Organization (KEK) in 2004. In this article we present our beam test results for the tile/fiber calorimeter focusing on the linearity in energy response, the energy resolution, position resolution and uniformity across the tile front face.

  4. The electromagnetic calorimeter in JLab Real Compton Scattering Experiment

    Energy Technology Data Exchange (ETDEWEB)

    Albert Shahinyan; Eugene Chudakov; A. Danagoulian; P. Degtyarenko; K. Egiyan; V. Gorbenko; J. Hines; E. Hovhannisyan; Ch. Hyde; C.W. de Jager; A. Ketikyan; V. Mamyan; R. Michaels; A.M. Nathan; V. Nelyubin; I. Rachek; M. Roedelbrom; A. Petrosyan; R. Pomatsalyuk; V. Popov; J. Segal; Yu. Shestakov; J. Templon; H. Voskanyan; B. Wojtsekhowski

    2007-04-16

    A hodoscope calorimeter comprising of 704 lead-glass blocks is described. The calorimeter was constructed for use in the JLab Real Compton Scattering experiment. The detector provides a measurement of the coordinates and the energy of scattered photons in the GeV energy range with resolutions of 5 mm and 6\\%/$\\sqrt{E_\\gamma \\, [GeV]}$, respectively. Design features and performance parameters during the experiment are presented.

  5. A 3000 element lead-glass electromagnetic calorimeter

    International Nuclear Information System (INIS)

    A 3045 element lead glass calorimeter and an associated fast trigger processor have been constructed, tested and implemented in BNL experiment E852 in conjunction with the multi-particle spectrometer (MPS). Approximately, 109 all-neutral and neutral plus charged triggers were recorded with this apparatus during data runs in 1994 and 1995. This paper reports on the construction, testing and performance of this lead glass calorimeter and the associated trigger processor. (orig.)

  6. Design and Electronics Commissioning of the Physics Prototype of a Si-W Electromagnetic Calorimeter for the International Linear Collider

    OpenAIRE

    Repond et al., J.; CALICE Collaboration

    2008-01-01

    The CALICE collaboration is studying the design of high performance electromagnetic and hadronic calorimeters for future International Linear Collider detectors. For the electromagnetic calorimeter, the current baseline choice is a high granularity sampling calorimeter with tungsten as absorber and silicon detectors as sensitive material. A ``physics prototype'' has been constructed, consisting of thirty sensitive layers. Each layer has an active area of 18x18 cm2 and a pad size of 1x1 cm2. T...

  7. A MAPS-based readout of an electromagnetic calorimeter for the ILC

    International Nuclear Information System (INIS)

    The physics goals of the International Linear Collider (ILC) require a significant improvement in the calorimetric performance relative to previous generations of detectors. Sampling electromagnetic calorimeters (ECAL) using silicon diodes as the active media are widely considered as a suitably performant-but very expensive-solution. A new digital approach to electromagnetic calorimeter design based on 50 μm pitch Monolithic Active Pixel Sensors is presented as an alternative solution which could offer (at least) the same performance at significantly reduced cost

  8. Characteristics of cast polystyrene scintillators for the electromagnetic calorimeter of the installation PHENIX

    International Nuclear Information System (INIS)

    Parameters of a polystyrene scintillator for the electromagnetic calorimeter of the PHENIX installation are studied. The scintillator was manufactured through casting under pressure by different compositions and concentration values of the scintillating additives. The data on the light yield and attenuation length for the scintillator plates, absorption and fluorescence spectra of the scintillation additives are presented. Effect of the plates on the light yield due to metallization of their lateral faces by the Al layer is studied. The value of the light yield from relativistic particle is measured for the electromagnetic calorimeter modules prototype. 2 refs., 8 figs

  9. Performance of a dual readout calorimeter with a BGO electromagnetic section

    International Nuclear Information System (INIS)

    The dual readout technique has been tested on a hybrid calorimeter. The electromagnetic section of this instrument consists of 100 BGO crystals and the hadronic section is made out scintillating and Cherenkov fibers embedded in a copper matrix (DREAM). The electromagnetic fraction of hadronic showers is evaluated on an event-by-event basis from the relative amounts of Cherenkov and scintillation lights produced in the shower development. The performance of such a calorimeter in terms of energy resolution is presented. Effects of side leakage on detector performance are also studied.

  10. Commissioning of the ATLAS electromagnetic calorimeter with minimum bias events

    CERN Document Server

    Hubaut, F

    2007-01-01

    This note presents the potentiality to commission the ATLAS EM calorimeter during the (very) first days of data taking, prior to be able to trig and identify correctly electrons. For this purpose, a very simple analysis using the $\\phi$ symmetry of the abundant minimum bias events and computing the energy accumulated in the EM calorimeter is proposed. No input from the Monte Carlo is necessary, and only information from the calorimeter is used. To cope with the high number of events, simulation and analysis are performed using the GRID technology. Adopting a simple energy reconstruction scheme based on the cosmic muon experience should allow to spot intrinsic problems of the EM calorimeter in a few days. It should also give first hints on the $\\phi$ dispersion of the Inner Detector material, if the excess is sizeable >10\\% X$_0$ in a region $\\Delta \\eta \\times \\Delta \\phi=0.1\\times 0.1$. Ultimately, a first flavor of systematics coming from the EM calorimeter $\\phi$~non-uniformity and its positionning (in the...

  11. γ-jets physics with the EMCal calorimeter in ALICE experiment at LHC

    International Nuclear Information System (INIS)

    Heavy ion collisions at LHC will produce a new state of matter: the quark-gluon plasma (QGP). Photons are not sensible to the strong interaction which dominates the nuclear medium, and hence are a valuable tool to explore QGP. Gamma-jets are rare hard processes: a photon and a parton are emitted back-to-back. The parton hadronises and produces a jet of particles. These jets are quenched due to the strong interaction of the parton with the QGP. This quenching, or more precisely the re-distribution of the energy in the jet, can be measured by the modification of the distribution of the particle energy in the jet, comparing p-p and Pb-Pb collisions (fragmentation functions or hump-backed plateau distributions). For this purpose, jet energy is needed, and can be provided precisely by gamma-jet measurement. Our goal is to use EMCal to detect a photon correlated with a jet reconstructed in ALICE tracking system. Then, the jet energy distribution are compared for p-p an Pb-Pb collisions. Gamma-jet physics is first addressed, the particle identification with EMCal is introduced to isolate the direct photon, i.e. a photon and a jet emitted back-to-back. Methods of jet identification and reconstruction are developed to determine hump-backed plateau distributions. Finally, these methods are tested to evaluate ALICE and particularly EMCal capabilities for gamma-jet study at LHC and to quantify the sensibility of this probe to explore the QGP. (author)

  12. Insertion of the first half-barrel of the ATLAS electromagnetic calorimeter into its cryostat

    CERN Multimedia

    Maximilien Brice

    2003-01-01

    The first cylinder of the ATLAS electromagnetic calorimeter barrel and the presampler have been inserted in the cryostat.The ATLAS electromagnetic calorimeter is intended to detect electrons, positrons and photons by measuring the energy they deposit on being absorbed. The cylinder of the calorimeter is in two halves, that will be sunk in a liquid-argon bath cooled to 90 kelvin (-180°C). Each half-barrel is 3.2 metres long, 53 cm thick and formed by assembling 16 modules. Each module is made up of alternate lead absorbers and electrodes pressed into 64 layers folded accordion-fashion. The presampler, set up inside the cylinder, is an integral part of the calorimeter system: It measures the energy lost by a particle before it reaches the calorimeter. To ensure an ultra-clean environment, a tent (visible here) was erected round the calorimeter and entry point to the cryostat. The detector and presampler, fitted together, could then be slid gradually into the cryostat like a drawer. To do so, the insertion team...

  13. Insertion of the first half-barrel of the ATLAS electromagnetic calorimeter into its cryostat

    CERN Multimedia

    Maximilien Brice

    2003-01-01

    The first cylinder of the ATLAS electromagnetic calorimeter barrel and the presampler have been inserted in the cryostat. The ATLAS electromagnetic calorimeter is intended to detect electrons, positrons and photons by measuring the energy they deposit on being absorbed. The cylinder of the calorimeter is in two halves, that will be sunk in a liquid-argon bath cooled to 90 kelvin (-180°C). Each half-barrel is 3.2 metres long, 53 cm thick and formed by assembling 16 modules. Each module is made up of alternate lead absorbers and electrodes pressed into 64 layers folded accordion-fashion. The presampler, set up inside the cylinder, is an integral part of the calorimeter system: It measures the energy lost by a particle before it reaches the calorimeter. To ensure an ultra-clean environment, a tent was erected round the calorimeter and entry point to the cryostat. The detector and presampler, fitted together, could then be slid gradually into the cryostat like a drawer. To do so, the insertion team had to fine-t...

  14. The design and performance of the electromagnetic calorimeters in Hall C at Jefferson Lab

    Energy Technology Data Exchange (ETDEWEB)

    Vardan Tadevosyan, Hamlet Mkrtchyan, Arshak Asaturyan, Arthur Mkrtchyan, Simon Zhamkochyan

    2012-12-01

    The design and performance of the electromagnetic calorimeters in the magnetic spectrometers in Hall C at Jefferson Lab are presented. For the existing HMS and SOS spectrometers, construction information and comparisons of simulated and experimental results are presented. The design and simulated performance for a new calorimeter to be used in the new SHMS spectrometer is also presented. We have developed and constructed electromagnetic calorimeters from TF-1 type lead-glass blocks for the HMS and SOS magnetic spectrometers at JLab Hall C. The HMS/SOS calorimeters are of identical design and construction except for their total size. Blocks of dimension 10 cm × 10 cm × 70 cm are arranged in four planes and stacked 13 and 11 blocks high in the HMS and SOS respectively. The energy resolution of these calorimeters is better than 6%/√E, and pion/electron (π/e) separation of about 100:1 has been achieved in energy range 1–5 GeV. Good agreement has been observed between the experimental and GEANT4 simulated energy resolutions. The HMS/SOS calorimeters have been used nearly in all Hall C experiments, providing good energy resolution and a high pion suppression factor. No significant deterioration in their performance has been observed in the course of use since 1994. For the SHMS spectrometer, presently under construction, details on the calorimeter design and accompanying GEANT4 simulation efforts are given. A Preshower+Shower design was selected as the most cost-effective among several design choices. The preshower will consist of a layer of 28 modules with TF-1 type lead glass radiators, stacked in two columns. The shower part will consist of 224 modules with F-101 type lead glass radiators, stacked in a “fly's eye” configuration of 14 columns and 16 rows. The active area of 120 × 130 cm(2) will encompass the beam envelope at the calorimeter. The anticipated performance of the new calorimeter is simulated over the full momentum range of the SHMS, predicting

  15. Design and status of the Mu2e electromagnetic calorimeter

    CERN Document Server

    Atanov, N; Budagov, J; Carosi, R; Cervelli, F; Colao, F; Cordelli, M; Corradi, G; Dane', E; Davydov, Yu I; Di Falco, S; Donati, S; Donghia, R; Echenard, B; Flood, K; Giovannella, S; Glagolev, V; Grancagnolo, F; Happacher, F; Hitlin, D G; Martini, M; Miscetti, S; Miyashita, T; Morescalchi, L; Murat, P; Pasciuto, D; Pezzullo, G; Porter, F; Saputi, A; Sarra, I; Soleti, S R; Spinella, F; Tassielli, G; Tereshchenko, V; Usubov, Z; Zhu, R Y

    2016-01-01

    The Mu2e experiment at Fermilab aims at measuring the neutrinoless conversion of a negative muon into an electron and reach a single event sensitivity of 2.5x10^{-17} after three years of data taking. The monoenergetic electron produced in the final state, is detected by a high precision tracker and a crystal calorimeter, all embedded in a large superconducting solenoid (SD) surrounded by a cosmic ray veto system. The calorimeter is complementary to the tracker, allowing an independent trigger and powerful particle identification, while seeding the track reconstruction and contributing to remove background tracks mimicking the signal. In order to match these requirements, the calorimeter should have an energy resolution of O(5)% and a time resolution better than 500 ps at 100 MeV. The baseline solution is a calorimeter composed of two disks of BaF2 crystals read by UV extended, solar blind, Avalanche Photodiode (APDs), which are under development from a JPL, Caltech, RMD consortium. In this paper, the calorim...

  16. Precision Measurement of Energy and Position Resolutions of the BTeV Electromagnetic Calorimeter Prototype

    OpenAIRE

    Batarin, V.; Brennan, T; Butler, J.; Cheung, H.; A. Derevschikov(Institute for High Energy Physics, Protvino Russia); Fomin, Y.; Frolov, V.(CERN, Geneva 23, 1211, Switzerland); Goncharenko, Y.; Grishin, V.; Kachanov, V.; Khodyrev, V.; Khroustalev, K.; Konstantinov, A.; Kravtsov, V.; Kubota, Y.

    2002-01-01

    The energy dependence of the energy and position resolutions of the electromagnetic calorimeter prototype made of lead tungstate crystals produced in Bogoroditsk (Russia) and Shanghai (China) is presented. These measurementswere carried out at the Protvino accelerator using a 1 to 45 GeV electron beam. The crystals were coupled to photomultiplier tubes. The dependence of energy and position resolutions on different factors as well as the measured electromagnetic shower lateral profile are pre...

  17. A high resolution electromagnetic calorimeter based on lead-tungstate crystals

    Czech Academy of Sciences Publication Activity Database

    Aleksandrov, D. V.; Burachas, S.F.; Ippolitov, M.S.; Mareš, Jiří A.; Polák, Karel

    2005-01-01

    Roč. 550, - (2005), s. 169-184. ISSN 0168-9002 Institutional research plan: CEZ:AV0Z10100521 Keywords : PbWO 3 * high resolution electromagnetic calorimeter Subject RIV: BM - Solid Matter Physics ; Magnetism Impact factor: 1.224, year: 2005

  18. Kinematic Fit for the Radiative Bhabha Calibration of BaBar's Electromagnetic Calorimeter

    OpenAIRE

    Bauer, Johannes M.

    2000-01-01

    For the radiative Bhabha calibration of BaBar's electromagnetic calorimeter, the measured energy of a photon cluster is being compared with the energy obtained via a kinematic fit involving other quantities from that event. The details of the fitting algorithm are described in this note, together with its derivation and checks that ensure that the fitting routine is working properly.

  19. Estimation of radiation effects in the front-end electronics of an ILC electromagnetic calorimeter

    International Nuclear Information System (INIS)

    The front-end electronics of the electromagnetic calorimeter of an International Linear Collider detector are situated in a radiation environment. This requires the effect of the radiation on the performance of the electronics, specifically FPGAs, to be examined. In this paper we study the flux, particle spectra and deposited doses at the front-end electronics of the electromagnetic calorimeter of a detector at the ILC. We also study the occupancy of the electromagnetic calorimeter. These estimates are compared with measurements, e.g. of the radiation damage of FPGAs, done elsewhere. The outcome of the study shows that the radiation doses and the annual flux is low enough to allow today's FPGAs to operate. The Single Event Upset rate, however, lies between 14 min and 12 h depending on the FPGA used and therefore needs to be considered in the design of the data acquisition system of the electromagnetic calorimeter. The occupancy is about 0.002 per bunch train not taking into account the effect of noise which depends on the choice of the detector

  20. VHDL Implementation of Feature-Extraction Algorithm for the PANDA Electromagnetic Calorimeter

    NARCIS (Netherlands)

    Kavatsyuk, M.; Guliyev, E.; Lemmens, P. J. J.; Lohner, H.; Tambave, G.

    2010-01-01

    The feature-extraction algorithm, developed for the digital front-end electronics of the electromagnetic calorimeter of the PANDA detector at the future FAIR facility, is implemented in VHDL for a commercial 16 bit 100 MHz sampling ADC. The use of modified firmware with the running on-line data-proc

  1. VHDL implementation of feature-extraction algorithm for the PANDA electromagnetic calorimeter

    NARCIS (Netherlands)

    Guliyev, E.; Kavatsyuk, M.; Lemmens, P. J. J.; Tambave, G.; Lohner, H.

    2012-01-01

    A simple, efficient, and robust feature-extraction algorithm, developed for the digital front-end electronics of the electromagnetic calorimeter of the PANDA spectrometer at FAIR, Darmstadt, is implemented in VHDL for a commercial 16 bit 100 MHz sampling ADC. The source-code is available as an open-

  2. The calibration of the central electromagnetic calorimeter of UA1 proton-antiproton experiment at CERN

    International Nuclear Information System (INIS)

    The most important result of the UA1 experiment at CERN has been the discovery of the weak intermediate vector bosons W+, W- and Z0. We describe the calibration of the electromagnetic calorimeter, which gives the signature of the electronic mode of desintegration of the intermediate bosons and measures their masses. We shall discuss this process and give some experimental results

  3. Temperature Dependence Calibration and Correction of the DAMPE BGO Electromagnetic Calorimeter

    CERN Document Server

    Wei, Yifeng; Zhang, Yunlong; Wen, Sicheng; Wang, Chi; Li, Zhiying; Feng, Changqing; Wang, Xiaolian; Xu, Zizong; Huang, Guangshun; Liu, Shubin

    2016-01-01

    A BGO electromagnetic calorimeter (ECAL) is built for the DArk Matter Particle Explorer (DAMPE) mission. The effect of temperature on the BGO ECAL was investigated with a thermal vacuum experiment. The light output of a BGO crystal depends on temperature significantly. The temperature coefficient of each BGO crystal bar has been calibrated, and a correction method is also presented in this paper.

  4. The multiplexed ADC system and the FASTBUS readout for the DELPHI forward electromagnetic calorimeter

    International Nuclear Information System (INIS)

    Two modules will be used to digitize and store the signals of the DELPHI Forward Electromagnetic Calorimeter (FEMC): these are the ADC card and the Optical Receiver with Front-End Buffer unit (OFB). A description of these modules and their performance are presented. (orig.)

  5. Electromagnetic calorimeter for the HADES@FAIR experiment

    Czech Academy of Sciences Publication Activity Database

    Svoboda, Ondřej; Blume, C.; Czyzycki, W.; Epple, E.; Fabbietti, L.; Galatyuk, T.; Golubeva, M.; Guber, F.; Hlaváč, S.; Ivashkin, A.; Kajetanowicz, M.; Kardan, B.; Koenig, W.; Kugler, Andrej; Lapidus, K.; Lisowski, E.; Pietraszko, J.; Reshetin, A.; Rost, A.; Salabura, P.; Sobolev, Yuri, G.; Tlustý, Pavel; Traxler, M.

    2014-01-01

    Roč. 9, MAY (2014), C05002. ISSN 1748-0221. [13th Topical Seminar on Innovative Particle and Radiation Detectors (IPRD 2013). Siena, 7.10.2013-10.10.2013] R&D Projects: GA ČR GA13-06759S; GA MŠk LG12007 Institutional support: RVO:61389005 Keywords : Cherenkov detectors * calorimeters * front-end electronics for detector readout Subject RIV: BG - Nuclear, Atomic and Molecular Physics, Colliders Impact factor: 1.399, year: 2014

  6. Energy Measurement with the ATLAS Electromagnetic Calorimeter at the Per Mill Accuracy Level

    CERN Document Server

    Teischinger, Florian; Fabjan, Christian

    The ATLAS experiment is designed to study the proton-proton collisions produced at the Large Hadron Collider (LHC) at CERN. It is made up of various sub-detectors to measure the properties of all the particles produced at the proton-proton collision. Over the last three years of running around 20 x 10^14 collisions of proton data have been recorded. Liquid argon (LAr) sampling calorimeters are used for all electromagnetic calorimetry and for hadronic calorimetry in the end-caps. The Inner Detector, on the other hand, measures the transverse momentum of charged particles down to a momentum of 0.5 GeV. This thesis deals with the absolute measurement of the energy in the electromagnetic calorimeter and the improvement of the systematic uncertainties. A method using the ratio of the energy E in the calorimeter and the momentum measurement p in the Inner Detector (E/p) was used to extract the energy scale of the electromagnetic LAr calorimeter for electrons and positrons. To investigate and further reduce the syst...

  7. Simulation studies of crystal-photodetector assemblies for the Turkish accelerator center particle factory electromagnetic calorimeter

    Science.gov (United States)

    Kocak, F.

    2015-07-01

    The Turkish Accelerator Center Particle Factory detector will be constructed for the detection of the produced particles from the collision of a 1 GeV electron beam against a 3.6 GeV positron beam. PbWO4 and CsI(Tl) crystals are considered for the construction of the electromagnetic calorimeter part of the detector. The generated optical photons in these crystals are detected by avalanche or PIN photodiodes. Geant4 simulation code has been used to estimate the energy resolution of the calorimeter for these crystal-photodiode assemblies.

  8. Simulation studies of crystal-photodetector assemblies for the Turkish accelerator center particle factory electromagnetic calorimeter

    Energy Technology Data Exchange (ETDEWEB)

    Kocak, F., E-mail: fkocak@uludag.edu.tr

    2015-07-01

    The Turkish Accelerator Center Particle Factory detector will be constructed for the detection of the produced particles from the collision of a 1 GeV electron beam against a 3.6 GeV positron beam. PbWO{sub 4} and CsI(Tl) crystals are considered for the construction of the electromagnetic calorimeter part of the detector. The generated optical photons in these crystals are detected by avalanche or PIN photodiodes. Geant4 simulation code has been used to estimate the energy resolution of the calorimeter for these crystal–photodiode assemblies.

  9. Simulation studies of crystal-photodetector assemblies for the Turkish accelerator center particle factory electromagnetic calorimeter

    International Nuclear Information System (INIS)

    The Turkish Accelerator Center Particle Factory detector will be constructed for the detection of the produced particles from the collision of a 1 GeV electron beam against a 3.6 GeV positron beam. PbWO4 and CsI(Tl) crystals are considered for the construction of the electromagnetic calorimeter part of the detector. The generated optical photons in these crystals are detected by avalanche or PIN photodiodes. Geant4 simulation code has been used to estimate the energy resolution of the calorimeter for these crystal–photodiode assemblies

  10. Performance of the first prototype of the CALICE scintillator strip electromagnetic calorimeter

    CERN Document Server

    Francis, K; Schlereth, J; Smith, J; Xia, L; Baldolemar, E; Li, J; Park, S T; Sosebee, M; White, A P; Yu, J; Eigen, G; Mikami, Y; Watson, N K; Thomson, M A; Ward, D R; Benchekroun, D; Hoummada, A; Khoulaki, Y; Apostolakis, J; Dotti, A; Folger, G; Ivantchenko, V; Ribon, A; Uzhinskiy, V; Carloganu, C; Gay, P; Manen, S; Royer, L; Tytgat, M; Zaganidis, N; Blazey, G C; Dyshkant, A; Lima, J G R; Zutshi, V; Hostachy, J -Y; Morin, L; Cornett, U; David, D; Ebrahimi, A; Falley, G; Gadow, K; Goettlicher, P; Guenter, C; Hartbrich, O; Hermberg, B; Karstensen, S; Krivan, F; Krueger, K; Lutz, B; Morozov, S; Morgunov, V; Neubueser, C; Reinecke, M; Sefkow, F; Smirnov, P; Terwort, M; Garutti, E; Laurien, S; Lu, S; Marchesini, I; Matysek, M; Ramilli, M; Briggl, K; Eckert, P; Harion, T; Schultz-Coulon, H -Ch; Shen, W; Stamen, R; Bilki, B; Norbeck, E; Northacker, D; Onel, Y; Wilson, G W; Kawagoe, K; Sudo, Y; Yoshioka, T; Dauncey, P D; Wing, M; Salvatore, F; Gil, E Cortina; Mannai, S; Baulieu, G; Calabria, P; Caponetto, L; Combaret, C; Della Negra, R; Grenier, G; Han, R; Ianigro, J-C; Kieffer, R; Laktineh, I; Lumb, N; Mathez, H; Mirabito, L; Petrukhin, A; Steen, A; Tromeur, W; Donckt, M Vander; Zoccarato, Y; Alamillo, E Calvo; Fouz, M -C; Puerta-Pelayo, J; Corriveau, F; Bobchenko, B; Chadeeva, M; Danilov, M; Epifantsev, A; Markin, O; Mizuk, R; Novikov, E; Popov, V; Rusinov, V; Tarkovsky, E; Besson, D; Buzhan, P; Ilyin, A; Kantserov, V; Kaplin, V; Karakash, A; Popova, E; Tikhomirov, V; Kiesling, C; Seidel, K; Simon, F; Soldner, C; Weuste, L; Amjad, M S; Bonis, J; Callier, S; di Lorenzo, S Conforti; Cornebise, P; Doublet, Ph; Dulucq, F; Fleury, J; Frisson, T; van der Kolk, N; Li, H; Martin-Chassard, G; Richard, F; de la Taille, Ch; Poeschl, R; Raux, L; Rouene, J; Seguin-Moreau, N; Anduze, M; Balagura, V; Boudry, V; Brient, J-C; Cornat, R; Frotin, M; Gastaldi, F; Guliyev, E; Haddad, Y; Magniette, F; Musat, G; Ruan, M; Tran, T H; Videau, H; Bulanek, B; Zacek, J; Cvach, J; Gallus, P; Havranek, M; Janata, M; Kvasnicka, J; Lednicky, D; Marcisovsky, M; Polak, I; Popule, J; Tomasek, L; Tomasek, M; Ruzicka, P; Sicho, P; Smolik, J; Vrba, V; Zalesak, J; Belhorma, B; Ghazlane, H; Kotera, K; Ono, H; Takeshita, T; Uozumi, S; Jeans, D; Chang, S; Khan, A; Kim, D H; Kong, D J; Oh, Y D; Goetze, M; Sauer, J; Weber, S; Zeitnitz, C

    2014-01-01

    A first prototype of a scintillator strip-based electromagnetic calorimeter was built, consisting of 26 layers of tungsten absorber plates interleaved with planes of 45x10x3 mm3 plastic scintillator strips. Data were collected using a positron test beam at DESY with momenta between 1 and 6 GeV/c. The prototype's performance is presented in terms of the linearity and resolution of the energy measurement. These results represent an important milestone in the development of highly granular calorimeters using scintillator strip technology. This technology is being developed for a future linear collider experiment, aiming at the precise measurement of jet energies using particle flow techniques.

  11. Design and development of the SDC barrel electromagnetic calorimeter

    International Nuclear Information System (INIS)

    In fulfillment of contract SSC92-W-17743, Argonne National Laboratory is required to closeout and document all work performed in the design and development of the central calorimeter for the Solenoidal Detector Collaboration (SDC) Detector at the Superconducting Super Collider Laboratory (SSCL). This report will summarize the work performed, and identify all documents (technical reports, memo's, drawings, etc.) that resulted from that effort. The work under this contract was shared in collaboration with the Westinghouse Science and Technology Center (WSTC) of Pittsburgh, Pennsylvania. It is the intent of this report to provide information that can be useful in the development of future detectors for high energy physics particle research

  12. The status of the construction and the performance of the ATLAS liquid argon electromagnetic calorimeters

    CERN Document Server

    Lund-Jensen, B

    2004-01-01

    The construction of the ATLAS liquid argon electromagnetic calorimeters is about to be completed The barrel calorimeter and the first end cap are inserted in their cryostats. The quality control performed during the production has resulted in only a very small fraction of malfunctioning channels, ~0.1 %o., and a low constant term in the energy resolution. Several modules of the calorimeter and their corresponding presampler sectors have been tested in electron beams and their energy resolution has been shown to be within the ATLAS requirements. The local constant term is better than 0.4% for all measured cells and the global constant term which includes the cell to cell response variation is less than 0.7%. (3 refs).

  13. Performance of an endcap prototype of the ATLAS accordion electromagnetic calorimeter

    CERN Document Server

    Gingrich, D M; Boos, E; Zhautykov, B O; Aubert, Bernard; Bazan, A; Beaugiraud, B; Boniface, J; Colas, Jacques; Jézéquel, S; Le Flour, T; Maire, M; Rival, F; Stipcevic, M; Thion, J; Van den Plas, D; Wingerter-Seez, I; Zitoun, R; Zolnierowski, Y; Chmeissani, M; Fernández, E; Garrido, L; Martínez, M; Padilla, C; Gordon, H A; Radeka, V; Rahm, David Charles; Stephani, D; Baisin, L; Berset, J C; Chevalley, J L; Gianotti, F; Gildemeister, O; Marin, C P; Nessi, Marzio; Poggioli, Luc; Richter, W; Vuillemin, V; Baze, J M; Gosset, L G; Lavocat, P; Lottin, J P; Mansoulié, B; Meyer, J P; Renardy, J F; Schwindling, J; Teiger, J; Collot, J; de Saintignon, P; Dzahini, D; Hostachy, J Y; Laborie, G; Mahout, G; Merchez, E; Pouxe, J; Hervás, L; Labarga, L; Scheel, C V; Chekhtman, A; Dargent, P; Dinkespiler, B; Etienne, F; Fassnacht, P; Fouchez, D; Martin, L; Martin, O; Miotto, A; Monnier, E; Nagy, E; Olivetto, C; Tisserant, S; Battistoni, G; Camin, D V; Cavalli, D; Costa, G; Cozzi, L; Resconi, S; Fedyakin, N N; Ferrari, A; Mandelli, L; Mazzanti, M; Perini, L; Sala, P R; Azuelos, Georges; Beaudoin, G; Depommier, P; León-Florián, E; Leroy, C; Roy, P; Serman, M; Augé, E; Chase, Robert L; Chollet, J C; de La Taille, C; Fayard, Louis; Fournier, D; Hrisoho, A T; Merkel, B; Noppe, J M; Parrour, G; Pétroff, P; Schaffer, A C; Seguin-Moreau, N; Serin, L; Tisserand, V; Vichou, I; Canton, B; David, J; Genat, J F; Imbault, D; Le Dortz, O; Savoy-Navarro, Aurore; Schwemling, P; Eek, L O; Lund-Jensen, B; Söderqvist, J; Lefebvre, M; Robertson, S; White, J

    1997-01-01

    The design and construction of a lead-liquid argon endcap calorimeter prototype using an accordion geometry and conceived as a sector of the inner wheel of the endcap calorimeter of the future ATLAS experiment at the LHC is described. The performance obtained using electron beam data is presented. The main results are an energy resolution with a sampling term below $11\\%/\\sqrt{E(\\rm GeV)}$ and a small local constant term, a good linearity of the response with the incident energy and a global constant term of 0.8\\% over an extended area in the rapidity range of $2.2 < \\eta <2.9$. These properties make the design suitable for the ATLAS electromagnetic endcap calorimeter.

  14. General readout scheme for the HADES Electromagnetic Calorimeter: status and perspectives

    International Nuclear Information System (INIS)

    The HADES spectrometer is located at the SIS18 accelerator at the GSI Helmholtz Center for Heavy Ion Research in Darmstadt. An electromagnetic calorimeter for the HADES experiment is currently under design. The calorimeter allows to measure neutral meson (π0 and η) production, which is essential for interpretation of dilepton data, but up to now unknown in heavy-ion reactions in the energy range of the planned FAIR experiments at SIS100. In order to investigate the optimal functionality of the calorimeter module properties a series of dedicated test experiments of the prototype frontend-electronics in combination with different PMT types have been performed. In this contribution we present details of the detector layout, the module properties, the readout system and its performance studies.

  15. Drift Time Measurement in the ATLAS Liquid Argon Electromagnetic Calorimeter using Cosmic Muons

    CERN Document Server

    Aad, G; Abdallah, J; Abdelalim, A A; Abdesselam, A; Abdinov, O; Abi, B; Abolins, M; Abramowicz, H; Abreu, H; Acharya, B S; Adams, D L; Addy, T N; Adelman, J; Adorisio, C; Adragna, P; Adye, T; Aefsky, S; Aguilar-Saavedra, J A; Aharrouche, M; Ahlen, S P; Ahles, F; Ahmad, A; Ahmed, H; Ahsan, M; Aielli, G; Akdogan, T; Åkesson, T P A; Akimoto, G; Akimov, A V; Aktas, A; Alam, M S; Alam, M A; Albert, J; Albrand, S; Aleksa, M; Aleksandrov, I N; Alessandria, F; Alexa, C; Alexander, G; Alexandre, G; Alexopoulos, T; Alhroob, M; Aliev, M; Alimonti, G; Alison, J; Aliyev, M; Allport, P P; Allwood-Spiers, S E; Almond, J; Aloisio, A; Alon, R; Alonso, A; Alviggi, M G; Amako, K; Amelung, C; Ammosov, V V; Amorim, A; Amorós, G; Amram, N; Anastopoulos, C; Andeen, T; Anders, C F; Anderson, K J; Andreazza, A; Andrei, V; Anduaga, X S; Angerami, A; Anghinolfi, F; Anjos, N; Antonaki, A; Antonelli, M; Antonelli, S; Antos, J; Antunovic, B; Anulli, F; Aoun, S; Arabidze, G; Aracena, I; Arai, Y; Arce, A T H; Archambault, J P; Arfaoui, S; Arguin, J F; Argyropoulos, T; Arik, E; Arik, M; Armbruster, A J; Arnaez, O; Arnault, C; Artamonov, A; Arutinov, D; Asai, M; Asai, S; Asfandiyarov, R; Ask, S; Åsman, B; Asner, D; Asquith, L; Assamagan, K; Astbury, A; Astvatsatourov, A; Atoian, G; Auerbach, B; Auge, E; Augsten, K; Aurousseau, M; Austin, N; Avolio, G; Avramidou, R; Axen, D; Ay, C; Azuelos, G; Azuma, Y; Baak, M A; Bacci, C; Bach, A; Bachacou, H; Bachas, K; Backes, M; Badescu, E; Bagnaia, P; Bai, Y; Bailey, D C; Bain, T; Baines, J T; Baker, O K; Baker, M D; Baker, S; Baltasar Dos Santos Pedrosa, F; Banas, E; Banerjee, P; Banerjee, S; Banfi, D; Bangert, A; Bansal, V; Baranov, S P; Baranov, S; Barashkou, A; Barber, T; Barberio, E L; Barberis, D; Barbero, M; Bardin, D Y; Barillari, T; Barisonzi, M; Barklow, T; Barlow, N; Barnett, B M; Barnett, R M; Baron, S; Baroncelli, A; Barr, A J; Barreiro, F; Barreiro Guimarães da Costa, J; Barrillon, P; Barros, N; Bartoldus, R; Bartsch, D; Bastos, J; Bates, R L; Batkova, L; Batley, J R; Battaglia, A; Battistin, M; Bauer, F; Bawa, H S; Bazalova, M; Beare, B; Beau, T; Beauchemin, P H; Beccherle, R; Becerici, N; Bechtle, P; Beck, G A; Beck, H P; Beckingham, M; Becks, K H; Bedajanek, I; Beddall, A J; Beddall, A; Bednár, P; Bednyakov, V A; Bee, C; Begel, M; Behar Harpaz, S; Behera, P K; Beimforde, M; Belanger-Champagne, C; Bell, P J; Bell, W H; Bella, G; Bellagamba, L; Bellina, F; Bellomo, M; Belloni, A; Belotskiy, K; Beltramello, O; Ben Ami, S; Benary, O; Benchekroun, D; Bendel, M; Benedict, B H; Benekos, N; Benhammou, Y; Benincasa, G P; Benjamin, D P; Benoit, M; Bensinger, J R; Benslama, K; Bentvelsen, S; Beretta, M; Berge, D; Bergeaas Kuutmann, E; Berger, N; Berghaus, F; Berglund, E; Beringer, J; Bernardet, K; Bernat, P; Bernhard, R; Bernius, C; Berry, T; Bertin, A; Besana, M I; Besson, N; Bethke, S; Bianchi, R M; Bianco, M; Biebel, O; Biesiada, J; Biglietti, M; Bilokon, H; Bindi, M; Binet, S; Bingul, A; Bini, C; Biscarat, C; Bitenc, U; Black, K M; Blair, R E; Blanchard, J B; Blanchot, G; Blocker, C; Blocki, J; Blondel, A; Blum, W; Blumenschein, U; Bobbink, G J; Bocci, A; Boehler, M; Boek, J; Boelaert, N; Böser, S; Bogaerts, J A; Bogouch, A; Bohm, C; Bohm, J; Boisvert, V; Bold, T; Boldea, V; Boldyrev, A; Bondarenko, V G; Bondioli, M; Boonekamp, M; Bordoni, S; Borer, C; Borisov, A; Borissov, G; Borjanovic, I; Borroni, S; Bos, K; Boscherini, D; Bosman, M; Bosteels, M; Boterenbrood, H; Bouchami, J; Boudreau, J; Bouhova-Thacker, E V; Boulahouache, C; Bourdarios, C; Boyd, J; Boyko, I R; Bozovic-Jelisavcic, I; Bracinik, J; Braem, A; Branchini, P; Brandenburg, G W; Brandt, A; Brandt, G; Brandt, O; Bratzler, U; Brau, B; Brau, J E; Braun, H M; Brelier, B; Bremer, J; Brenner, R; Bressler, S; Breton, D; Britton, D; Brochu, F M; Brock, I; Brock, R; Brodbeck, T J; Brodet, E; Broggi, F; Bromberg, C; Brooijmans, G; Brooks, W K; Brown, G; Brubaker, E; Bruckman de Renstrom, P A; Bruncko, D; Bruneliere, R; Brunet, S; Bruni, A; Bruni, G; Bruschi, M; Buanes, T; Bucci, F; Buchanan, J; Buchholz, P; Buckley, A G; Budagov, I A; Budick, B; Büscher, V; Bugge, L; Bulekov, O; Bunse, M; Buran, T; Burckhart, H; Burdin, S; Burgess, T; Burke, S; Busato, E; Bussey, P; Buszello, C P; Butin, F; Butler, B; Butler, J M; Buttar, C M; Butterworth, J M; Byatt, T; Caballero, J; Cabrera Urbán, S; Caforio, D; Cakir, O; Calafiura, P; Calderini, G; Calfayan, P; Calkins, R; Caloba, L P; Caloi, R; Calvet, D; Camarri, P; Cambiaghi, M; Cameron, D; Campabadal Segura, F; Campana, S; Campanelli, M; Canale, V; Canelli, F; Canepa, A; Cantero, J; Capasso, L; Capeans Garrido, M D M; Caprini, I; Caprini, M; Capua, M; Caputo, R; Caracinha, D; Caramarcu, C; Cardarelli, R; Carli, T; Carlino, G; Carminati, L; Caron, B; Caron, S; Carrillo Montoya, G D; Carron Montero, S; Carter, A A; Carter, J R; Carvalho, J; Casadei, D

    2010-01-01

    The ionization signals in the liquid argon of the ATLAS electromagnetic calorimeter are studied in detail using cosmic muons. In particular, the drift time of the ionization electrons is measured and used to assess the intrinsic uniformity of the calorimeter gaps and estimate its impact on the constant term of the energy resolution. The drift times of electrons in the cells of the second layer of the calorimeter are uniform at the level of 1.3% in the barrel and 2.7% in the endcaps. This leads to an estimated contribution to the constant term of 0.29% in the barrel and 0.53% in the endcaps. The same data are used to measure the drift velocity of ionization electrons in liquid argon, which is found to be 4.61 +- 0.07 mm/microsecond at 88.5 K and 1 kV/mm.

  16. CHARACTERIZATION OF THE COHERENT NOISE, ELECTROMAGNETIC COMPATIBILITY AND ELECTROMAGNETIC INTERFERENCE OF THE ATLAS EM CALORIMETER FRONT END BOARD

    International Nuclear Information System (INIS)

    The ATLAS Electromagnetic (EM) calorimeter (EMCAL) Front End Board (FEB) will be located in custom-designed enclosures solidly connected to the feedtroughs. It is a complex mixed signal board which includes the preamplifier, shaper, switched capacitor array analog memory unit (SCA), analog to digital conversion, serialization of the data and related control logic. It will be described in detail elsewhere in these proceedings. The electromagnetic interference (either pick-up from the on board digital activity, from power supply ripple or from external sources) which affects coherently large groups of channels (coherent noise) is of particular concern in calorimetry and it has been studied in detail

  17. The supermodule insertion tool of the CMS electromagnetic calorimeter is leaving to the experimental hall located at P5.

    CERN Multimedia

    2006-01-01

    The supermodule insertion tool of the CMS electromagnetic calorimeter is leaving to the experimental hall located at P5. A successful test has been performed with a real supermodule, visible as a silver-coloured box on the last picture.

  18. Energy resolution of a lead scintillating fiber electromagnetic calorimeter

    International Nuclear Information System (INIS)

    A calorimeter module was fabricated using profiled lead plates and scintillating fibers with diameter 1 mm and attenuation length about 80 cm. The absorber-to-fiber volume ratio was 1.17 and the module average radiation length X0 = 1.05 cm. The energy resolution of the module was investigated using the electron beams of U-70 at Serpukhov and of the SPS at CERN in the energy range 5-70 GeV. The energy resolution at θ = 30 (the angle between the fiber axis and the beam direction) may be expressed by the formula σ/E(%) = 13.1/√E ± 1.7. The energy resolution was also simulated by Monte Carlo and good agreement with the experiment has been achieved. 12 refs.; 13 figs.; 4 tabs

  19. Calibration and reconstruction performances of the KLOE electromagnetic calorimeter

    Energy Technology Data Exchange (ETDEWEB)

    Adinolfi, M.; Aloisio, A.; Ambrosino, F.; Andryakov, A.; Antonelli, A.; Antonelli, M.; Anulli, F.; Bacci, C.; Bankamp, A.; Barbiellini, G.; Bellini, F.; Bencivenni, G.; Bertolucci, S.; Bini, C.; Bloise, C.; Bocci, V.; Bossi, F.; Branchini, P.; Bulychjov, S.A.; Cabibbo, G.; Calcaterra, A.; Caloi, R.; Campana, P.; Capon, G.; Carboni, G.; Cardini, A.; Casarsa, M.; Cataldi, G.; Ceradini, F.; Cervelli, F.; Cevenini, F.; Chiefari, G.; Ciambrone, P.; Conetti, S.; Conticelli, S.; Lucia, E. De; Robertis, G. De; Sangro, R. De; Simone, P. De; Zorzi, G. De; Dell' Agnello, S.; Denig, A.; Domenico, A. Di; Donato, C. Di; Falco, S. Di; Doria, A.; Drago, E.; Elia, V.; Erriquez, O.; Farilla, A.; Felici, G.; Ferrari, A.; Ferrer, M.L.; Finocchiaro, G.; Forti, C.; Franceschi, A.; Franzini, P.; Gao, M.L.; Gatti, C.; Gauzzi, P.; Giovannella, S.; Golovatyuk, V.; Gorini, E.; Grancagnolo, F.; Grandegger, W.; Graziani, E.; Guarnaccia, P.; Hagel, U.V.; Han, H.G.; Han, S.W.; Huang, X.; Incagli, M.; Ingrosso, L.; Jang, Y.Y.; Kim, W.; Kluge, W.; Kulikov, V.; Lacava, F.; Lanfranchi, G.; Lee-Franzini, J.; Lomtadze, F.; Luisi, C.; Mao, C.S.; Martemianov, M.; Matsyuk, M.; Mei, W.; Merola, L.; Messi, R.; Miscetti, S. E-mail: stefano.miscetti@lnf.infn.it; Moalem, A.; Moccia, S.; Moulson, M.; Mueller, S.; Murtas, F.; Napolitano, M.; Nedosekin, A.; Panareo, M.; Pacciani, L.; Pages, P.; Palutan, M.; Paoluzi, L.; Pasqualucci, E.; Passalacqua, L.; Passaseo, M.; Passeri, A.; Patera, V.; Petrolo, E.; Petrucci, G.; Picca, D.; Pirozzi, G.; Pistillo, C.; Pollack, M.; Pontecorvo, L.; Primavera, M.; Ruggieri, F.; Santangelo, P.; Santovetti, E.; Saracino, G.; Schamberger, R.D.; Schwick, C.; Sciascia, B.; Sciubba, A.; Scuri, F.; Sfiligoi, I.; Shan, J.; Silano, P.; Spadaro, T.; Spagnolo, S.; Spiriti, E.; Stanescu, C.; Tong, G.L.; Tortora, L.; Valente, E.; Valente, P.; Valeriani, B.; Venanzoni, G.; Veneziano, S.; Wu, Y.; Xie, Y.G.; Zhao, P.P.; Zhou, Y

    2001-04-01

    The main aim of the KLOE experiment at DAPHINE, the Frascati phi-factory, is to study CP violation in the K{sup 0}-K-bar{sup 0} system. Requirements on shower detection are very stringent. An hermetic, lead-scintillating fiber sampling calorimeter has been chosen and built. A review of the methods used to calibrate and reconstruct energy and timing is reported in this paper. Emphasis is given to the calibration procedures developed using the 2.4 pb{sup -1} collected in 1999. An energy resolution of 5.7% E/GeV is achieved together with a linearity in energy response better than 1% above 50 MeV. A time resolution of {approx}54 ps E/GeV is also measured on samples of radiative Bhabha and PHI decays.

  20. Calibration and reconstruction performances of the KLOE electromagnetic calorimeter

    International Nuclear Information System (INIS)

    The main aim of the KLOE experiment at DAPHINE, the Frascati phi-factory, is to study CP violation in the K0-K-bar0 system. Requirements on shower detection are very stringent. An hermetic, lead-scintillating fiber sampling calorimeter has been chosen and built. A review of the methods used to calibrate and reconstruct energy and timing is reported in this paper. Emphasis is given to the calibration procedures developed using the 2.4 pb-1 collected in 1999. An energy resolution of 5.7% E/GeV is achieved together with a linearity in energy response better than 1% above 50 MeV. A time resolution of ∼54 ps E/GeV is also measured on samples of radiative Bhabha and PHI decays

  1. The lead-glass electromagnetic calorimeters for the magnetic spectrometers in Hall C at Jefferson Lab

    Energy Technology Data Exchange (ETDEWEB)

    Mkrtchyan, Hamlet [Yerevan Physics Institute, JLAB; Carlini, Roger D. [JLAB; Tadevosyan, Vardan H. [Yerevan Physics Institute; Arrington, John Robert [ANL; Asaturyan, Arshak Razmik [Yerevan Physics Institute; Christy, Michael Eric [Hampton U.; Dutta, Dipangkar [Mississippi State U.; Ent, Rolf [JLAB; Fenker, Howard C. [JLAB; Gaskell, David J. [JLAB; Horn, Tanja [Catholic University of America, JLAB; Jones, Mark K. [JLAB; Keppel, Cynthia [JLAB, Hampton U.; Mack, David J. [JLAB; Malace, Simona P. [Triangle Universities Nuclear Laboratory and Duke University; Mkrtchyan, Arthur [Yerevan Physics Institute; Niculescu, Maria-Ioana [James Madison U.; Seely, Charles Jason [MIT; Tvaskis, Vladas [University of Manitoba; Wood, Stephen A. [JLAB; Zhamkochyan, Simon [Yerevan Physics Institute

    2013-08-01

    The electromagnetic calorimeters of the various magnetic spectrometers in Hall C at Jefferson Lab are presented. For the existing HMS and SOS spectrometers design considerations, relevant construction information, and comparisons of simulated and experimental results are included. The energy resolution of the HMS and SOS calorimeters is better than $\\sigma/E \\sim 6%/\\sqrt E $, and pion/electron ($\\pi/e$) separation of about 100:1 has been achieved in energy range 1 -- 5 GeV. Good agreement has been observed between the experimental and simulated energy resolutions, but simulations systematically exceed experimentally determined $\\pi^-$ suppression factors by close to a factor of two. For the SHMS spectrometer presently under construction details on the design and accompanying GEANT4 simulation efforts are given. The anticipated performance of the new calorimeter is predicted over the full momentum range of the SHMS. Good electron/hadron separation is anticipated by combining the energy deposited in an initial (preshower) calorimeter layer with the total energy deposited in the calorimeter.

  2. Test beam results on Atlas electromagnetic end-cap calorimeter: Electrons-jets separation

    International Nuclear Information System (INIS)

    ATLAS is one of the four experiments being built on the future proton-proton collider at CERN: the LHC. This experiment has a large physics program, from Standard Model to new physics. The search for the Higgs boson in two photons or in four leptons, or the search of Z' or W' needs a good energy resolution for the electromagnetic calorimeter. This thesis describes the beam tests performed on three modules of the electromagnetic end cap calorimeter. A 0.6% non-uniformity, and a 0.7% energy resolution global constant term (dominant at high energy) has been obtained. Moreover, a study on the separation between electrons and jets is also performed. This study shows that a jets rejection factor of 105 can be obtained keeping an electron efficiency better than 78%. (author)

  3. Performance of the ATLAS electromagnetic calorimeter end-cap module 0

    International Nuclear Information System (INIS)

    The construction and beam test results of the ATLAS electromagnetic end-cap calorimeter pre-production module 0 are presented. The stochastic term of the energy resolution is between 10% and 12.5% GeV1/2 over the full pseudorapidity range. Position and angular resolutions are found to be in agreement with simulation. A global constant term of 0.6% is obtained in the pseudorapidity range 2.5<η<3.2 (inner wheel)

  4. An accordion liquid argon electromagnetic calorimeter with absorber in all electrodes

    International Nuclear Information System (INIS)

    A prototype electromagnetic liquid argon calorimeter with accordion geometry, using absorber material in all electrodes, has been constructed and tested. This construction results in twice the sampling frequency compared to the conventional accordion electrode structure. The energy resolution, measured with 15 GeV electrons, was found to be 6.3%/√(E), in good agreement with the value expected from Monte Carlo simulations. ((orig.))

  5. Temperature dependence calibration and correction of the DAMPE BGO electromagnetic calorimeter

    Science.gov (United States)

    Wei, Y. F.; Zhang, Z. Y.; Zhang, Y. L.; Wen, S. C.; Wang, C.; Li, Z. Y.; Feng, C. Q.; Wang, X. L.; Xu, Z. Z.; Huang, G. S.; Liu, S. B.

    2016-07-01

    A BGO electromagnetic calorimeter (ECAL) is built for the DArk Matter Particle Explorer (DAMPE) mission. The temperature effect on the BGO ECAL was investigated with a thermal vacuum experiment. The light output of a BGO crystal depends on temperature significantly, and the readout system is also affected by temperature. The temperature coefficient of each BGO detection unit has been calibrated, and a correction method is also presented in this paper.

  6. The intercalibration of the CMS electromagnetic calorimeter at the test beam

    CERN Document Server

    Govoni, P

    2007-01-01

    During summer 2006, 9 supermodules of the CMS electromagnetic calorimeter (ECAL) have been exposed to an electron beam at the CERN SPS north area facility. Each supermodule contains 1700 crystals. The intercalibration coefficients of the different channels have been measured for each supermodule. The reproducibility of the intercalibration has been tested by measuring a supermodule twice. The intercalibration coefficients obtained in the electron beam have also been compared with those obtained with cosmic ray muons.

  7. Radiation hardness qualification of PbWO4 scintillation crystals for the CMS Electromagnetic Calorimeter

    CERN Document Server

    Adzic, P; Andelin, D; Anicin, I; Antunovic, Z; Arcidiacono, R; Arenton, M W; Auffray, E; Argiro, S; Askew, A; Baccaro, S; Baffioni, S; Balazs, M; Bandurin, D; Barney, D; Barone, L M; Bartoloni, A; Baty, C; Beauceron, S; Bell, K W; Bernet, C; Besancon, M; Betev, B; Beuselinck, R; Biino, C; Blaha, J; Bloch, P; Borisevitch, A; Bornheim, A; Bourotte, J; Brown, R M; Buehler, M; Busson, P; Camanzi, B; Camporesi, T; Cartiglia, N; Cavallari, F; Cecilia, A; Chang, P; Chang, Y H; Charlot, C; Chen, E A; Chen, W T; Chen, Z; Chipaux, R; Choudhary, B C; Choudhury, R K; Cockerill, D J A; Conetti, S; Cooper, S; Cossutti, F; Cox, B; Cussans, D G; Dafinei, I; Da Silva Di Calafiori, D R; Daskalakis, G; David, A; Deiters, K; Dejardin, M; De Benedetti, A; Della Ricca, G; Del Re, D; Denegri, D; Depasse, P; Descamps, J; Diemoz, M; Di Marco, E; Dissertori, G; Dittmar, M; Djambazov, L; Djordjevic, M; Dobrzynski, L; Dolgopolov, A; Drndarevic, S; Drobychev, G; Dutta, D; Dzelalija, M; Elliott-Peisert, A; El Mamouni, H; Evangelou, I; Fabbro, B; Faure, J L; Fay, J; Fedorov, A; Ferri, F; Franci, D; Franzoni, G; Freudenreich, K; Funk, W; Ganjour, S; Gascon, S; Gataullin, M; Gentit, F X; Ghezzi, A; Givernaud, A; Gninenko, S; Go, A; Gobbo, B; Godinovic, N; Golubev, N; Govoni, P; Grant, N; Gras, P; Haguenauer, M; Hamel de Monchenault, G; Hansen, M; Haupt, J; Heath, H F; Heltsley, B; Hintz, W; Hirosky, R; Hobson, P R; Honma, A; Hou, G W S; Hsiung, Y; Huhtinen, M; Ille, B; Ingram, Q; Inyakin, A; Jarry, P; Jessop, C; Jovanovic, D; Kaadze, K; Kachanov, V; Kailas, S; Kataria, S K; Kennedy, B W; Kokkas, P; Kolberg, T; Korjik, M; Krasnikov, N; Krpic, D; Kubota, Y; Kuo, C M; Kyberd, P; Kyriakis, A; Lebeau, M; Lecomte, P; Lecoq, P; Ledovskoy, A; Lethuillier, M; Lin, S W; Lin, W; Litvine, V; Locci, E; Longo, E; Loukas, D; Luckey, P D; Lustermann, W; Ma, Y; Malberti, M; Malclès, J; Maletic, D; Manthos, N; Maravin, Y; Marchica, C; Marinelli, N; Markou, A; Markou, C; Marone, M; Matveev, V; Mavrommatis, C; Meridiani, P; Milenovic, P; Miné, P; Missevitch, O; Mohanty, A K; Moortgat, F; Musella, P; Musienko, Y; Nardulli, A; Nash, J; Nedelec, P; Negri, P; Newman, H B; Nikitenko, A; Nessi-Tedaldi, F; Obertino, M M; Organtini, G; Orimoto, T; Paganoni, M; Paganini, P; Palma, A; Pant, L; Papadakis, A; Papadakis, I; Papadopoulos, I; Paramatti, R; Parracho, P; Pastrone, N; Patterson, J R; Pauss, F; Peigneux, J-P; Petrakou, E; Phillips II, D G; Piroué, P; Ptochos, F; Puljak, I; Pullia, A; Punz, T; Puzovic, J; Ragazzi, S; Rahatlou, S; Rander, J; Razis, P A; Redaelli, N; Renker, D; Reucroft, S; Ribeiro, P; Rogan, C; Ronquest, M; Rosowsky, A; Rovelli, C; Rumerio, P; Rusack, R; Rusakov, S V; Ryan, M J; Sala, L; Salerno, R; Schneegans, M; Seez, C; Sharp, P; Shepherd-Themistocleous, C H; Shiu, J G; Shivpuri, R K; Shukla, P; Siamitros, C; Sillou, D; Silva, J; Silva, P; Singovsky, A; Sirois, Y; Sirunyan, A; Smith, V J; Stöckli, F; Swain, J; Tabarelli de Fatis, T; Takahashi, M; Tancini, V; Teller, O; Theofilatos, K; Thiebaux, C; Timciuc, V; Timlin, C; Titov, M; Topkar, A; Triantis, F A; Troshin, S; Tyurin, N; Ueno, K; Uzunian, A; Varela, J; Verrecchia, P; Veverka, J; Virdee, T; Wang, M; Wardrope, D; Weber, M; Weng, J; Williams, J H; Yang, Y; Yaselli, I; Yohay, R; Zabi, A; Zelepoukine, S; Zhang, J; Zhang, L Y; Zhu, K; Zhu, R Y

    2010-01-01

    Ensuring the radiation hardness of PbWO4 crystals was one of the main priorities during the construction of the electromagnetic calorimeter of the CMS experiment at CERN. The production on an industrial scale of radiation hard crystals and their certification over a period of several years represented a difficult challenge both for CMS and for the crystal suppliers. The present article reviews the related scientific and technological problems encountered.

  8. Monte Carlo simulation of the properties of an electromagnetic streamer tube calorimeter

    Energy Technology Data Exchange (ETDEWEB)

    Baumgart, R.; Grupen, C.; Meyer, H.J.; Schaefer, U.

    1988-06-20

    Saturation effects in an electromagnetic calorimeter with streamer tube readout have been studied by Monte Carlo simulations. Streamers produce temporary dead zones which remain insensitive to other particles within one event. The observed longitudinal shower profiles can be fitted by the results of simulations yielding a value for the width of the dead zone of delta = 1 mm. We attribute this relatively low value to the use of small sampling cells and a pure isobutane gas filling.

  9. Monte Carlo simulation of the properties of an electromagnetic streamer tube calorimeter

    International Nuclear Information System (INIS)

    Saturation effects in an electromagnetic calorimeter with streamer tube readout have been studied by Monte Carlo simulations. Streamers produce temporary dead zones which remain insensitive to other particles within one event. The observed longitudinal shower profiles can be fitted by the results of simulations yielding a value for the width of the dead zone of δ = 1 mm. We attribute this relatively low value to the use of small sampling cells and a pure isobutane gas filling. (orig.)

  10. A Silicon-Tungsten Electromagnetic Calorimeter with Integrated Electronics for the International Linear Collider

    Science.gov (United States)

    Brau, J.; Breidenbach, M.; Frey, R.; Freytag, D.; Gallagher, C.; Graf, N.; Haller, G.; Herbst, R.; Holbrook, B.; Jaros, J.; Lander, R.; Radloff, P.; Strom, D.; Tripathi, M.; Woods, M.

    2012-12-01

    We present an update of the development of an electromagnetic calorimeter for the Silicon Detector concept for a future linear electron-positron collider. After reviewing the design criteria and related simulation studies, we discuss progress in the research and development of the detector. This concept has from the outset made the case for highly integrated electronic readout with small (1 mm) readout gaps in order to maintain a small Moliere radius for electromagnetic showers and to avoid active heat removal. We now have fully functioning 1024-channel readout chips which have been successfully bonded to 15 cm silicon sensors. We present initial results from these assemblies.

  11. A method of electromagnetic shower identification and measuring of its position in segmented calorimeters

    International Nuclear Information System (INIS)

    The Monte Carlo investigation of spatial resolution for electromagnetic showers of the calorimeter of the Spherical Neutral Detector (SND) has been performed. For description of the transverse distribution of energy in an electromagnetic shower the function exp(-βx√R) is introduced. On its base the method of estimation of shower angles and the criterion of close photon separation have been worked out. It is shown that for the photons with the energy less than 700 MeV this method provides the best results compared to the other methods. 15 refs.; 14 figs.; 3 tabs

  12. Role of the CMS electromagnetic calorimeter in the hunt for the Higgs boson in the two-gamma channel

    CERN Document Server

    Tabarelli de Fatis, Tommaso

    2012-01-01

    The distinctive signature of the two-photon decay of a low-mass Higgs boson ($H\\to\\gamma\\gamma$) would be a narrow resonance, smeared by the photon energy and direction resolution, over a continuum background of di-photons or spurious events. The sensitivity to this decay mode greatly benefits from the energy and position resolution and photon identification capabilities of the electromagnetic calorimeters at the LHC. In this context, the performance of the electromagnetic calorimeter (ECAL) of CMS - a hermetic, fine grained and homogeneous calorimeter made of lead-tungstate (PbWO$_4$ ) crystals, completed by a silicon lead preshower installed in front of the endcaps - is presented.

  13. Digital signal processing in the PANDA Electromagnetic Calorimeter

    Energy Technology Data Exchange (ETDEWEB)

    Kavatsyuk, Myroslav; Guliyev, Elmaddin; Tambave, Ganesh; Loehner, Herbert [KVI, University of Groningen (Netherlands); Collaboration: PANDA-Collaboration

    2011-07-01

    The PANDA collaboration at FAIR will employ antiproton annihilations to investigate yet undiscovered charm-meson states and glueballs. The aim is to study QCD phenomena in the non-perturbative regime and to unravel the origin of hadronic masses. A multi-purpose detector for tracking, calorimetry and particle identification is presently being developed to run at high luminosities providing up to 2.10{sup 7} interactions/s. One of the crucial components of the PANDA spectrometer is the EMC, composed of cooled PbWO{sub 4} crystals coupled to the Large Area Avalanche Photodiodes or Vacuum Photo-Triodes/Tetrodes. The photo-sensor signals are continuously digitized by the Sampling ADC (SADC) and analyzed on-line in the FPGA of the digitizer module to detect hits and extract energy and time information. Measurements with a prototype calorimeter were performed at the tagged-photon facility at MAMI-C, Mainz. The results demonstrate the excellent performance of the SADC readout, with energy resolutions better than achieved by analogue electronics and a sub-nanosecond time resolution. A fast on-line pile-up recovery algorithm has been developed. The layout of the complete digital read-out chain is presented, and results from applications in test experiments with the PANDA-EMC prototypes are reported.

  14. Digital signal processing in the PANDA Electromagnetic Calorimeter

    International Nuclear Information System (INIS)

    The PANDA collaboration at FAIR will employ antiproton annihilations to investigate yet undiscovered charm-meson states and glueballs. The aim is to study QCD phenomena in the non-perturbative regime and to unravel the origin of hadronic masses. A multi-purpose detector for tracking, calorimetry and particle identification is presently being developed to run at high luminosities providing up to 2.107 interactions/s. One of the crucial components of the PANDA spectrometer is the EMC, composed of cooled PbWO4 crystals coupled to the Large Area Avalanche Photodiodes or Vacuum Photo-Triodes/Tetrodes. The photo-sensor signals are continuously digitized by the Sampling ADC (SADC) and analyzed on-line in the FPGA of the digitizer module to detect hits and extract energy and time information. Measurements with a prototype calorimeter were performed at the tagged-photon facility at MAMI-C, Mainz. The results demonstrate the excellent performance of the SADC readout, with energy resolutions better than achieved by analogue electronics and a sub-nanosecond time resolution. A fast on-line pile-up recovery algorithm has been developed. The layout of the complete digital read-out chain is presented, and results from applications in test experiments with the PANDA-EMC prototypes are reported.

  15. ALICE on the move

    CERN Document Server

    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...

  16. 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...

  17. Study and optimization of the performances of the CMS electromagnetic calorimeter for the physics at LHC

    International Nuclear Information System (INIS)

    The CMS experiment (Compact Muon Solenoid) is one of the two multi-purpose experiments of the proton-proton collider LHC (Large Hadron Collider). One of the main goals of CMS is the search for the Higgs boson. The collaboration has chosen an electromagnetic calorimeter made of about 75000 scintillating lead tungstate crystals PbWO4, at the same time fast, radiation hard, and extremely precise, especially in the energy range for the Higgs boson search, in the channel where it decays in 2 photons. The five first chapters of this thesis present the LHC, the CMS detector and notably the electromagnetic calorimeter (ECAL). The sixth chapter presents a test beam analysis realized in 2004 at CERN with an electron beam of different energies (20-250 GeV) incident on a part (1/36) of the calorimeter barrel called super-module. A study of the energy measurement variation within 9 (3*3) and 25 (5*5) crystals matrices as function of the impact position of the initial electron was done to infer a correction method of the energy measured as function of different parameters. This method has improved very significantly the energy resolution of the calorimeter in the test beam configuration. The last chapter of this thesis presents an application of this correction method for the electrons and photons in the full simulation chain of CMS. The energy reconstruction of photons and electrons is more complicated compared to the test beam case, because of an important amount of matter in front of the calorimeter and of the strong magnetic field in the central part of the CMS detector. The photons have a non negligible probability to convert into an electron-positron pair before the calorimeter, while the electrons (and positrons), whose trajectory is bent in the transverse plan, lose energy in the matter and can emit a random number of Bremsstrahlung photons. A reconstruction algorithm of the electrons and photons energy has been developed to take into account this issue and to apply the

  18. Flash ADC readout of the GlueX forward electromagnetic calorimeter

    Science.gov (United States)

    Kornicer, Mihajlo

    2008-10-01

    The GlueX experiment at Jefferson Lab will use a 9 GeV high-rate (10^7 -10^8/s) photon beam, incident on a liquid hydrogen target, to search for hybrid-meson production in the mass range of 1.5-2.5 GeV/c^2. Abundant photon production from neutral meson decays is expected in the decay chains of hybrid mesons, which will result in several photons in the forward region. The forward electromagnetic calorimeter (FCAL) of the GlueX detector is designed to reconstruct final state photons using an array of 2800 lead-glass blocks. The FCAL will employ flash analog-to-digital converter (FADC) technology to measure both deposited energy and photon arrival time using pulses from FEU-84-3 photomultiplier tubes. A real-time sum of the total calorimeter energy will be used as an input to the trigger. Timing information from individual crystals will be used to suppress the expected high-level of electromagnetic background from the photon beam and forward-going charged particles. We present the performance characteristics of the calorimeter readout based on simulation and data taken with a prototype 12-bit, 250 MHz flash ADC.

  19. Intercalibration of the barrel electromagnetic calorimeter of the CMS experiment at start-up

    CERN Document Server

    Adzic, Petar; Almeida, Nuno; Anagnostou, Georgios; Andelin, Daniel; Anfreville, Marc; Anicin, Ivan; Antunovic, Zeljko; Arcidiacono, Roberta; Arenton, Michael Wayne; Auffray, Etiennette; Argiro, Stefano; Askew, Andrew; Atramentov, Oleksiy; Baccaro, Stefania; Baffioni, Stephanie; Balazs, Michael; Barney, David; Barone, Luciano; Bartoloni, Alessandro; Baty, Clement; Bandurin, Dmitry; Beauceron, Stephanie; Bell, Ken W; Benetta, Robert; Bercher, Michel; Bernet, Colin; Berthon, Ursula; Besançon, Marc; Betev, Botjo; Beuselinck, Raymond; Biino, Cristina; Blaha, Jan; Bloch, Philippe; Blyth, Simon; Bornheim, Adolf; Bourotte, Jean; Brett, Angela Mary; Brown, Robert M; Britton, David; Bühler, M; Busson, Philippe; Camanzi, Barbara; Camporesi, Tiziano; Carrera, E; Cartiglia, Nicolo; Cavallari, Francesca; Cerutti, Muriel; Chang, Paoti; Chang, You-Hao; Charlot, Claude; Chen, E Augustine; Chen, Wan-Ting; Chen, Zheng-Yu; Chipaux, Rémi; Choudhary, Brajesh C; Choudhury, Rajani Kant; Cockerill, David J A; Combaret, Christophe; Conetti, Sergio; Cossutti, Fabio; Cox, Bradley; Cussans, David; Dafinei, Ioan; Da Silva Di Calafiori, Diogo Raphael; Daskalakis, Georgios; Davatz, Giovanna; David, A; Deiters, Konrad; Dejardin, Marc; Djordjevic, Milos; Della Negra, Rodolphe; Della Ricca, Giuseppe; Del Re, Daniele; De Min, Alberto; Denegri, Daniel; Depasse, Pierre; Descamps, Julien; Diemoz, Marcella; Di Marco, Emanuele; Dissertori, Günther; Dittmar, Michael; Djambazov, Lubomir; Dobrzynski, Ludwik; Drndarevic, Snezana; Duboscq, Jean Etienne; Dutta, Dipanwita; Dzelalija, Mile; Peisert, A; El-Mamouni, H; Evangelou, Ioannis; Evans, David; Fabbro, Bernard; Faure, Jean-Louis; Fay, Jean; Ferri, Federico; Flower, Paul S; Franci, Daniele; Franzoni, Giovanni; Freudenreich, Klaus; Funk, Wolfgang; Ganjour, Serguei; Gargiulo, Corrado; Gascon, Susan; Gataullin, Marat; Geerebaert, Yannick; Gentit, François-Xavier; Gershtein, Yuri; Ghezzi, Alessio; Ghodgaonkar, Manohar; Gilly, Jean; Givernaud, Alain; Gninenko, Sergei; Go, Apollo; Gobbo, Benigno; Godinovic, Nikola; Golubev, Nikolai; Gong, Datao; Govoni, Pietro; Grant, Nicholas; Gras, Philippe; Greenhalgh, R J S; Guevara Riveros, Luz; Guillaud, Jean-Paul; Haguenauer, Maurice; Hamel de Monchenault, Gautier; Hansen, Magnus; Heath, Helen F; Heltsley, Brian; Hill, Jack; Hintz, Wieland; Hirosky, Robert; Hobson, Peter R; Honma, Alan; Hou, George Wei-Shu; Hsiung, Yee; Husejko, Michal; Ille, Bernard; Imlay, Richard; Ingram, Quentin; Jarry, Patrick; Jessop, Colin; Jovanovic, Dragoslav; Kaadze, Ketino; Kachanov, Vassili; Kailas, Swaminathan; Kataria, Sushil Kumar; Kennedy, Bruce W; Kloukinas, Kostas; Kokkas, Panagiotis; Kolberg, Ted; Krasnikov, Nikolai; Krpic, Dragomir; Kubota, Yuichi; Kumar, P; Kuo, Chen-Cheng; Kyberd, Paul; Kyriakis, Aristotelis; Lebeau, Michel; Lecomte, Pierre; Lecoq, Paul; Ledovskoy, Alexander; Leshev, Georgi; Lethuillier, Morgan; Lin, Sheng-Wen; Lin, Willis; Lintern, A L; Litvine, Vladimir; Locci, Elizabeth; Lodge, Anthony B; Longo, Egidio; Loukas, Demetrios; Luckey, Paul David; Lustermann, Werner; Lynch, Clare; Ma, Yousi; Mahlke-Krüger, H; Malberti, Martina; Malcles, Julie; Maletic, Dimitrije; Mandjavidze, Irakli; Manthos, Nikolaos; Maravin, Yurii; Marchica, Carmelo; Marinelli, Nancy; Markou, Athanasios; Markou, Christos; Marone, Matteo; Mathez, Hervé; Matveev, Viktor; Mavrommatis, Charalampos; Maurelli, Georges; Meridiani, Paolo; Milenovic, Predrag; Milleret, Gérard; Miné, Philippe; Mohanty, Ajit Kumar; Moortgat, Filip; Mur, Michel; Musella, Pasquale; Musienko, Yuri; Nardulli, Alessandro; Nash, Jordan; Nédélec, Patrick; Negri, Pietro; Newman, Harvey B; Nikitenko, Alexander; Nessi-Tedaldi, Francesca; Obertino, Maria Margherita; Organtini, Giovanni; Orimoto, Toyoko; Paganoni, Marco; Paganini, Pascal; Palma, Alessandro; Panev, Bozhidar; Pant, Lalit Mohan; Papadakis, Antonakis; Papadakis, Ioannis; Papadopoulos, Ioannis; Paramatti, Riccardo; Parracho, P; Pastrone, Nadia; Patterson, Juliet Ritchie; Pauss, Felicitas; Petrakou, Eleni; Phillips, D G; Piroué, Pierre; Ptochos, Fotios; Puljak, Ivica; Pullia, Antonino; Punz, Thomas; Puzovic, Jovan; Ragazzi, Stefano; Rahatlou, Shahram; Rander, John; Razis, Panos A; Redaelli, Nicola; Renker, Dieter; Reucroft, Steve; Reymond, Jean-Marc; Ribeiro, Pedro Quinaz; Röser, Ulf; Rogan, Christopher; Romanteau, Thierry; Rondeaux, Françoise; Ronquest, Michael; Rosowsky, André; Rovelli, Chiara; Rumerio, Paolo; Rusack, Roger; Rusakov, Sergey V; Ryan, Matthew John; Sala, Leonardo; Salerno, Roberto; Santanastasio, Francesco; Schinzel, Dietrich; Seez, Christopher; Sharp, Peter; Shepherd-Themistocleous, Claire; Siamitros, Christos; Sillou, Daniel; Singovsky, Alexander; Sirois, Yves; Sirunyan, Albert M; Silva, J; Silva, Pedro; Shiu, Jing-Ge; Shivpuri, Ram Krishen; Shukla, Prashant; Smith, Brian; Smith, Vincent J; Sproston, Martin; Stöckli, Fabian; Suter, Henry; Swain, John; Tabarellide Fatis, T; Takahashi, Maiko; Tcheremoukhine, Alexandre; Teller, Olivier; Theofilatos, Konstantinos; Thiebaux, Christophe; Timciuc, Vladlen; Timlin, Claire; Titov, Maksym; Tobias, A; Topkar, Anita; Triantis, Frixos A; Troshin, Sergey; Tyurin, Nikolay; Ueno, Koji; Uzunian, Andrey; Varela, Joao; Verrecchia, Patrice; Veverka, Jan; Vichoudis, Paschalis; Virdee, Tejinder; Vlassov, E; Von Gunten, Hans Peter; Wang, Minzu; Wardrope, David; Weber, Markus; Weng, Joanna; Williams, Jennifer C; Yang, Yong; Yaselli, Ignacio; Yohay, Rachel; Zabi, Alexandre; Zamiatin, Nikolai; Zelepoukine, Serguei; Zhang, Jia-Wen; Zhang, Lin; Zhu, Kejun; Zhu, Ren-Yuan

    2008-01-01

    Calibration of the relative response of the individual channels of the barrel electromagnetic calorimeter of the CMS detector was accomplished before installation with cosmic ray muons and test beams. One fourth of the calorimeter was exposed to a beam of high energy electrons and the relative calibration of the channels, the intercalibration, was found to be reproducible to a precision of about 0.3\\%. Additionally, data were collected with cosmic rays for the entire ECAL barrel during the commissioning phase. By comparing the intercalibration constants obtained with the electron beam data with those from the cosmic ray data, it is demonstrated that the latter provide an intercalibration precision of 1.5\\% over most of the ECAL. The best intercalibration precision is expected to come from the analysis of events collected {\\it in situ} during the LHC operation. Using data collected with both electrons and pion beams, several aspects of the intercalibration procedures based on electrons or neutral pions were in...

  20. Investigation of interactions of high energy muons using the electromagnetic calorimeter 'WILLI'

    International Nuclear Information System (INIS)

    Prompted by a number of recent large-scale experiments, approaching astrophysical questions, there is a current interest in the spectroscopy of high energy muons originating from the interactions of cosmic rays particles in the Earth atmosphere. They potentially provide signatures about some characteristics of Ultra High Energy interactions and of the nature of the primary particle. In order to study the feasibility and the actual problems of small and less expensive calorimeter type set-ups, a prototype of an electromagnetic calorimeter (WILLI) has been built up in NIPNE-HH Bucharest. The detector is made up by alternating 20 lead absorber plates with scintillators, the latter viewed by photomultipliers placed in opposite corners to maximize light collection and minimized the position dependence of the signal. High energy muons can be generated by electromagnetic interaction secondary particles, which initiate electromagnetic cascades. The longitudinal profile of such showers will be sampled by the number and energies of the secondary particles. With the Maximum Likelihood Method, one can estimate the energy of the muon. Moreover, the primary information can serve as input for non-parametric statistical methods (Bayes classification or Neural Networks). Using Monte-Carlo simulations the incoming muons can be classified. This study is related to the KASCADE experiment as possible extension of the detection capabilities. A more recent experimental study aimed at muons of lower energy, 1 GeV and less, which stop in the calorimeter and then decay. Because of the nuclear capture of stopped negative muons and the subsequent decrease in the mean life time, one can obtain for the ratio between positive and negative muons in the cosmic flux. This ratio shows an excess in positive muons. The muon charge ratio may serve as a test quantity of hadronic interaction models. At lower muon energies the muon charge ratio can be useful for the interpretation of neutrino detection

  1. 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...

  2. Implementation and performance of the Detector Control System for the electromagnetic calorimeter of the CMS experiment

    CERN Document Server

    Adzic, P; Cavallari, F; Di Calafiori, D; Dissertori, G; Gómez-Reino, Robert; Inyakin, A; Jovanovic, D; Leshev, G; Milenovic, P; Ofierzynski, R; Punz, T; Puzovic, J; Zelepoukine, S

    2007-01-01

    In this presentation we describe the main design objectives, the detailed specifications and the final layout of the Detector Control System (DCS) for the electromagnetic calorimeter (ECAL) of the CMS experiment. Emphasis is put on the system implementation and specific hardware and software solutions in each of its sub-systems. The latest results from the tests of final prototypes of these subsystems during the 2006 ECAL test-beam programme, as well as the installation and commissioning of the whole DCS at the CMS experimental construction site are discussed.

  3. A Tungsten / Scintillating Fiber Electromagnetic Calorimeter Prototype for a High-Rate Muon g-2 Experiment

    OpenAIRE

    McNabb, R.; Blackburn, J.; Crnkovic, J. D.; Hertzog, D. W.; Kiburg, B.; Kunkle, J.; Thorsland, E.; Webber, D. M.; Lynch, K R

    2009-01-01

    A compact and fast electromagnetic calorimeter prototype was designed, built, and tested in preparation for a next-generation, high-rate muon g-2 experiment. It uses a simple assembly procedure: alternating layers of 0.5-mm-thick tungsten plates and 0.5-mm-diameter plastic scintillating fiber ribbons. This geometry leads to a detector having a calculated radiation length of 0.69 cm, a Moliere radius of 1.73 cm, and a measured intrinsic sampling resolution term of (11.8\\pm1.1)/\\sqrt{E(GeV)}, i...

  4. Properties of the most recent avalanche photodiodes for the CMS electromagnetic calorimeter

    CERN Document Server

    Deiters, K; Nicol, S; Patel, B; Renker, D; Reucroft, S; Rusack, R W; Sakhelashvili, T M; Swain, J D; Vikas, P

    2000-01-01

    Avalanche photodiodes (APDs) with improved characteristics are being developed by Hamamatsu Photonics for the electromagnetic calorimeter of the CMS experiment. More than 30 prototypes have been made and investigated during the last 3 years in a development program, that showed significant progress. The parameters of the most recent APDs including the long-term stability and the effect of high radiation levels with a neutron fluence of 2*10/sup 13/ n/cm/sup 2/ have been studied and are presented. (4 refs).

  5. Study of the response of ATLAS electromagnetic liquid argon calorimeters to muons

    CERN Document Server

    Aharrouche, M; Di Ciaccio, L; El Kacimi, M; Gaumer, O; Gouanère, M; Goujdami, D; Lafaye, R; Laplace, S; Le Maner, C; Neukermans, L; Perrodo, P; Poggioli, L; Prieur, D; Przysiezniak, H; Sauvage, G; Wingerter-Seez, I; Zitoun, R; Lanni, F; Ma, H; Rajagopalan, S; Rescia, S; Takai, H; Belymam, A; Benchekroun, D; Hakimi, M; Hoummada, A; Gao, Y; Lu, L; Stroynowski, R; Aleksa, M; Carli, T; Fassnacht, P; Gianotti, F; Hervas, L; Lampl, W; Collot, J; Hostachy, J Y; Ledroit-Guillon, F; Malek, F; Martin, P; Viret, S; Leltchouk, M; Parsons, J A; Simion, S; Barreiro, F; Del Peso, J; Labarga, L; Oliver, C; Rodier, S; Barrillon, P; Djama, F; Hubaut, F; Mangeard, P S; Monnier, E; Niess, V; Pralavorio, P; Resende, B; Sauvage, D; Serfon, C; Tisserant, S; Toth, J; Zhang, H; Banfi, D; Carminati, L; Cavalli, D; Costa, G; Delmastro, M; Fanti, M; Mandelli, L; Mazzanti, M; Tartarelli, G F; Kotov, K; Maslennikov, A; Pospelov, G; Tikhonov, Yu; Bourdarios, C; Fayard, L; Fournier, D; Iconomidou-Fayard, L; Kado, M; Parrour, G; Plamondon, M; Puzo, P; Rousseau, D; Sacco, R; Serin, L; Unal, G; Zerwas, D; Dekhissi, B; Derkaoui, J; El Kharrim, A; Maaroufi, F; Cleland, W; Lacour, D; Laforge, B; Nikolic-Audit, I; Schwemling, Ph; Ghazlane, H; Cherkaoui El Moursli, R; Idrissi Fakhr-Eddine, A; Boonekamp, M; Mansoulié, B; Meyer, P; Schwindling, J; Lund-Jensen, B; Tayalati, Y

    2009-01-01

    The response of the ATLAS electromagnetic calorimeter to muons has been studied in this paper. Results on signal over noise ratio, assessment of the detector response uniformity, and position resolution are presented. The possibility to study fine details of the structure of the detector through its response to muons is illustrated on a specific example. Finally, the performance obtained on muons in test-beam is used to estimate the detector uniformity and time alignment precision that will be reachable after the commissioning of the ATLAS detector with cosmic rays.

  6. Irradiation tests of an electromagnetic fibre-Pb calorimeter module at LURE/LAL

    International Nuclear Information System (INIS)

    We report on preliminary results of an irradiation test concerning the resistance to radiation of a scintillating fibre electromagnetic calorimeter module. In these tests we have measured the light output from the module before and after being irradiated in a high intensity 1.1 GeV electron beam. The beam was tuned to low intensity in order to perform the measurements in situ. We found that after a total dose of 3 Mrad deposited in the fibres at the peak of damage the signal showed a loss of 18% after 30 hours of recovery. A detailed description is given below. (author)

  7. Performance of the ATLAS Electromagnetic Calorimeter End-cap Module 0

    CERN Document Server

    Aubert, Bernard; Alexa, C; Astesan, F; Augé, E; Aulchenko, V M; Ballansat, J; Barreiro, F; Barrillon, P; Battistoni, G; Bazan, A; Beaugiraud, B; Beck-Hansen, J; Belhorma, B; Belorgey, J; Belymam, A; Ben-Mansour, A; Benchekroun, D; Benchouk, C; Bernard, R; Bertoli, W; Boniface, J; Bonivento, W; Bourdarios, C; Bremer, J; Breton, D; Bán, J; Camard, A; Canton, B; Carminati, L; Cartiglia, N; Chalifour, M; Chekhtman, A; Chen, H; Cherkaoui, R; Chevalley, J L; Chollet, F; Citterio, M; Clark, A; Cleland, W; Clément, C; Colas, Jacques; Collot, J; Costa, G; Cros, P; Cunitz, H; Del Peso, J; Delebecque, P; Delmastro, M; Di Ciaccio, Lucia; Dinkespiler, B; Djama, F; Dodd, J; Driouichi, C; Dumont-Dayot, N; Duval, P Y; Efthymiopoulos, I; Egdemir, J; El-Kacimi, M; El-Mouahhidi, Y; Engelmann, R; Ernwein, J; Falleau, I; Fanti, M; Farrell, J; Fassnacht, P; Ferrari, A; Fichet, S; Fournier, D; Gallin-Martel, M L; Gara, A; García, G; Gaumer, O; Ghazlane, H; Ghez, P; Gianotti, F; Girard, C; Gordon, H; Gouanère, M; Guilhem, G; Hackenburg, B; Hakimi, M; Hassani, S; Henry-Coüannier, F; Hervás, L; Hinz, L; Hoffman, A; Hoffman, J; Hostachy, J Y; Hoummada, A; Hubaut, F; Idrissi, A; Imbault, D; Jacquier, Y; Jevaud, M; Jérémie, A; Jézéquel, S; Kambara, H; Karst, P; Kazanin, V; Kierstead, J A; Kolachev, G M; Kordas, K; de La Taille, C; Labarga, L; Lacour, D; Lafaye, R; Laforge, B; Lanni, F; Le Coroller, A; Le Dortz, O; Le Maner, C; Le Van-Suu, A; Le Flour, T; Leite, M; Leltchouk, M; Lesueur, J; Lissauer, D; Lund-Jensen, B; Lundqvist, J M; Ma, H; Macé, G; Makowiecki, D S; Malsyshev, V; Mandelli, L; Mansoulié, B; Marin, C P; Martin, D; Martin, L; Martin, O; Martin, P; Maslennikov, A L; Massol, N; Mazzanti, M; McCarthy, R; McDonald, J; Megner, L; Merkel, B; Mirea, A; Moneta, L; Monnier, E; Moynot, M; Nagy, E; Negroni, S; Neukermans, L; Nicod, D; Nikolic-Audit, I; Noppe, J M; Ohlsson-Malek, F; Olivier, C; Orsini, F; Pailler, P; Parrour, G; Parsons, J A; Pearce, M; Perrodo, P; Perrot, G; Poggioli, Luc; Pospelov, G E; Pralavorio, Pascal; Prast, J; Przysiezniak, H; Puzo, P; Pétroff, P; Radeka, V; Rahm, David Charles; Rajagopalan, S; Raymond, M; Renardy, J F; Repetti, B; Rescia, S; Riccadona, X; Richer, J P; Rijssenbeek, M; Rodier, S; Rossel, F; Rousseau, D; Rydström, S; Saboumazrag, S; Sauvage, D; Sauvage, G; Schilly, P; Schwemling, P; Schwindling, J; Seguin-Moreau, N; Seidl, W; Seman, M; Serin, L; Shousharo, A; Simion, S; Sippach, W; Snopkov, R; Steffens, J; Stroynowski, R; Stumer, I; Taguet, J P; Takai, H; Talyshev, A A; Tartarelli, F; Teiger, J; Thion, J; Tikhonov, Yu A; Tisserant, S; Tocut, V; Tóth, J; Veillet, J J; Vossebeld, Joost Herman; Vuillemin, V; Wielers, M; Willis, W J; Wingerter-Seez, I; Ye, J; Yip, K; Zerwas, D; Zitoun, R; Zolnierowski, Y

    2003-01-01

    The construction and beam test results of the ATLAS electromagnetic end-cap calorimeter pre-production module 0 are presented. The stochastic term of the energy resolution is between 10% GeV^1/2 and 12.5% GeV^1/2 over the full pseudorapidity range. Position and angular resolutions are found to be in agreement with simulation. A global constant term of 0.6% is obtained in the pseudorapidity range 2.5 < eta < 3.2 (inner wheel).

  8. Conceptual design and performance simulations of super-compact electromagnetic calorimeter

    Directory of Open Access Journals (Sweden)

    Skoda Libor

    2013-11-01

    Full Text Available Measurements of particle production at forward rapidities in high energy p-p, p-A and A-A collisions provide access to physics processes at very low Bjorken x. These measurements will allow to study the gluon saturation scale and improve our knowledge of parton distribution in nuclei. Specific requirements must be fulfilled for a calorimeter to successfully operate in high-multiplicity forward region within often stringent space limits. Here we present a study of a conceptual design of super-compact electromagnetic calorimeter being developed at Czech Technical University in Prague. The design of the sampling calorimeter is based on a sandwich structure of thin tungsten and scintillator layers oriented in parallel to the beam. Used optical readout of individual scintillator pads guaranties the required high radiation hardness of the detector. We present simulation of the expected performance of the optical pad readout together with overall detector performance. It is aimed for the detector to allow measuring of high energy photons (1

  9. The CMS Electromagnetic Calorimeter lessons learned during LHC run 1, overview and future projections

    CERN Document Server

    Martelli, Arabella

    2014-01-01

    The Electromagnetic Calorimeter (ECAL) of the Compact Muon Solenoid (CMS) experiment at the LHC is a hermetic, fine grained, homogeneous calorimeter, comprising 75,848 lead tungstate scintillating crystals. We highlight the key role of the ECAL in the discovery and elucidation of the Standard Model Higgs boson during LHC Run I. We discuss, with reference to specific examples from LHC Run I, the challenges of operating a crystal calorimeter at a hadron collider. Particular successes, chiefly in terms of achieving and maintaining the required detector energy resolution in the harsh radiation environment of the LHC, are described. The prospects for LHC Run II (starting in 2015) are discussed, building upon the experience gained from Run I. The high luminosity upgrade of the LHC (HL-LHC) is expected to be operational from about 2025 to 2035 and will provide instantaneous and integrated luminosities of around 5 x 10^34 cm-2 s-1 and 3000 fb^-1 respectively. We outline the challenges that ECAL will face and motivate...

  10. The CMS Electromagnetic Calorimeter: overview, lessons learned during Run 1 and future projections

    International Nuclear Information System (INIS)

    The Electromagnetic Calorimeter (ECAL) of the Compact Muon Solenoid (CMS) experiment at the LHC is a hermetic, fine grained, homogeneous calorimeter, containing 75,848 lead tungstate scintillating crystals. We highlight the key role of the ECAL in the discovery and elucidation of the Standard Model Higgs boson during LHC Run I. We discuss, with reference to specific examples from LHC Run I, the challenges of operating a crystal calorimeter at a hadron collider. Particular successes, chiefly in terms of achieving and maintaining the required detector energy resolution in the harsh radiation environment of the LHC, are described. The prospects for LHC Run II (starting in 2015) are discussed, building upon the experience gained from Run I. The high luminosity upgrade of the LHC (HL-LHC) is expected to be operational from about 2025 to 2035 and will provide instantaneous and integrated luminosities of around 5 × 1034/cm2/s and 3000/fb respectively. We outline the challenges that ECAL will face and motivate the evolution of the detector that is thought to be necessary to maintain its performance throughout LHC and High-Luminosity LHC operation

  11. Study of a prototype electromagnetic calorimeter in the CALICE experiment under the Linear Collider International project

    International Nuclear Information System (INIS)

    This thesis is conducted within the framework of the International Linear Collider and the international collaboration so called CALICE. This work focuses on a study of a prototype of the electromagnetic calorimeter. This prototype has been used in various test period at CERN, DESY and FNAL. The author presents two subjects of study: The first part is about the instrumentation for the resolution of the square event discovered during the taking data in 2006 at CERN. To explain the origin and solve the problem caused by crosstalk between peripherals pixels and the guard ring that surrounds the sensor, two studies were made: a simulation study using SILVACO software and a test bench to study several kinds of sensors. The second part of this thesis is a study on the identification of photons using estimators that are related to the parameters of the electromagnetic pattern of the shower. (author)

  12. Calibration of the Atlas electromagnetic calorimeter. Search for the Higgs boson in its invisible decays

    International Nuclear Information System (INIS)

    The most promising channels for an intermediate mass Higgs boson discovery at LHC are leptonic and photonic decays. Therefore, a good uniformity of response of the electromagnetic calorimeter is required to reach the 0.7% constant term needed. This thesis deals with the absolute calibration of this detector. An electrical description of the calibration system, the detector and its read-out chain has been made for a better comprehension of the signal pulse shapes. A method, using a convolution of the calibration waveforms, has been developed to predict physics response, leading to absolute calibration. The level of accuracy obtained allows to reach the 0.3% contribution to the constant term required. Test beam analysis of a prototype module showed the performance of the electromagnetic calorimeter in terms of local resolution and linearity. A uniformity study has been made, leading to a 0.8% dispersion on a Δη x Δφ = 1.2 x 0.75 area. In a second part, the observability of an invisible Higgs boson produced via weak boson fusion at the LHC is presented. A level 1 trigger strategy for this purely jet and missing ET final states is discussed. A method to measure the level of background using physics events is presented. This analysis shows that an invisible branching ratio of 25% could be reached at 95% CL with only 30 fb-1 for a Higgs boson mass of 120 GeV/c2. (author)

  13. Calibration and performance test of the Very-Front-End electronics for the CMS electromagnetic calorimeter

    International Nuclear Information System (INIS)

    A Very-Front-End (VFE) card is an important part of the on-detector read-out electronics of the CMS (Compact Muon Solenoid) electromagnetic calorimeter that is made of ∼ 76.000 radiation hard scintillating crystals PbWO4 and operates on the Large Hadron Collider (LHC) at CERN. Almost 16.000 VFE cards that shape, amplify and digitize incoming signals from photodetectors generated by interacting particles. Since any maintenance of any part of the calorimeter is not possible during the 10-year lifetime of the experiment, the extensive screening program was employed throughout the whole manufacture process. As a part of readout electronics quality assurance program, the systems for burn-in and precise calibration of the VFE boards were developed and successfully used at IPN Lyon. In addition to functionality tests, all relevant electrical properties of each card were measured and analyzed in detail to obtain their full characterization and to build a database with all required parameters which will serve for the initial calibration of the whole calorimeter. In order to evaluate the calorimeter performance and also to deliver the most precise calibration constants, several fully equipped super-modules were extensively studied and calibrated during the test beam campaigns at CERN. As an important part of these tests, accurate studies of the electronics noise and relative gains, which are needed for measurement in high energy range, were carried out to optimize amplitude reconstruction procedure and thus improve the precision of the calorimeter energy determination. The heart of the thesis consists of the calibration of all VFE boards, including optimization of the laboratory calibration system and precise analysis of measured values to delivered desired calibration constants. The second half of the thesis is focused on the accurate evaluation and optimization of the read-out electronics in real data taking conditions. The results obtained in the laboratory at IPN Lyon

  14. Role of the CMS Electromagnetic Calorimeter in the hunt for the Higgs boson in the two-gamma channel

    International Nuclear Information System (INIS)

    The distinctive signature of the two-photon decay mode of a low-mass Higgs boson (H → γγ) would be a narrow resonance, smeared by the photon energy and direction resolution, over a non-resonant background of diphotons or spurious events. The sensitivity to this decay mode greatly benefits from the energy and position resolution and photon identification capabilities of the electromagnetic calorimeters at the LHC. In this context, the performance of the electromagnetic calorimeter (ECAL) of the CMS experiment - a hermetic, fine grained and homogeneous calorimeter made of lead-tungstate (PbWO4) crystals, completed by a silicon/lead preshower installed in front of the endcaps - is presented.

  15. Performance study of a prototype of an electromagnetic calorimeter from Aleph: Signature of electrons and rejection of pions

    International Nuclear Information System (INIS)

    We have analysed data taken with a prototype of the ALEPH electromagnetic calorimeter. The aim of this work was to find criteria to obtain the lowest value of the π/e rejection coefficient with a good efficiency to the electrons. At the same time we have measured the energy resolution and the spatial resolution of our apparatus. The experimental results were compared with the predictions of the simulation programs: EGS for the electromagnetic showers and GHEISHA for the hadronic one's

  16. Study of requirements and performances of the electromagnetic calorimeter for the Mu2e experiment at Fermilab

    Energy Technology Data Exchange (ETDEWEB)

    Soleti, S. [Sapienza Univ. of Rome (Italy)

    2015-06-15

    In this thesis we discuss the simulation and tests carried out for the optimization and design of the electromagnetic calorimeter for the Mu2e (Muon to electron conversion) experiment, which is a proposed experiment part of the Muon Campus hosted at Fermi National Accelerator Laboratory (FNAL) in Batavia, United States.

  17. Development and testing the prototype of an electromagnetic calorimeter, based on a lead tungstate crystals for the PHENIX experiment

    International Nuclear Information System (INIS)

    Electromagnetic calorimeter MPC project is a part of upgrade program of experiment PHENIX at the Relativistic Hadron-Ion Collider at BNL. MPC consists of two modules of approximately 200 channels each and located in the region of forward rapidities. This paper contains technical requirements for the project and results of MPC prototype beam tests

  18. Construction of the ATLAS end cap electromagnetic calorimeter and study of its performances

    International Nuclear Information System (INIS)

    ATLAS is one of the four experiments which will take place at the LHC, the CERN future protons collider. This accelerator, which should start in 2007, will allow to continue the studies carried out by its predecessors, as the standard model Higgs boson and new physics searches. The very high luminosity -10 fb-1 during the first three functioning years, then 100 fb-1- and the 14 TeV in the frame center will ease these studies. The Centre de Physique des Particules de Marseille took part in the ATLAS collaboration, taking in charge half of the End-cap electromagnetic calorimeter modules construction. The description of this sub-detector and the construction steps, in particular the electrical tests which allow the stacking validation, are presented in this document. These tests results, obtained for the live first production modules, are analysed. The pre-series module (module 0) performances, obtained with beam tests performed at CERN in 1999, are also presented. The detector uniformity studies have allowed to perform important improvements on the calorimeter components. A 0.6% global constant term has been determined in the End-cap internal region (wheel). (author)

  19. A COME and KISS QDC read-out scheme for the HADES Electromagnetic Calorimeter

    International Nuclear Information System (INIS)

    At the future FAIR Facility in Darmstadt the High Acceptance Di-Electron Spectrometer will continue its physics program. For beam energies between 2 and 40 GeV/u the database for pion and eta production is not complete. Therefore, interpretation of future di-electron data would have to depend on interpolations or on theoretical models. The addition of an electromagnetic calorimeter to HADES would allow such measurements and would additionally improve the electron-to-pion separation at large momentum p>0.4 GeV/c. Furthermore, photon measurement would be of a large interest for the HADES strangeness program. An 8 channel QDC Front-End-Electronics (FEE) was developed for the signals of photomultipliers (PMTs) from lead-glass calorimeter modules. The measurement principle is to convert the charge of the PMT signals into a pulse, where the charge is encoded in the width of the pulse. The width of the pulses is afterwards measured by the already well-established TRBv3 platform. For that simple electronics, hiding complex operations inside a commercial FPGA is used. In this contribution the current status and future perspectives of this read-out concept are shown.

  20. The ATLAS Liquid Argon Electromagnetic EndCap Calorimeter Construction and tests

    CERN Document Server

    Rodier, S; Del Peso, J

    2003-01-01

    This thesis has been carried out within the ATLAS collaboration. ATLAS is one of the two multipurpose experiments approved for data taking at the Large Hadron Collider (LHC) at CERN. The main goals of this experiment are, to find the Higgs boson, the missing piece in the otherwise so succesful Standard Model of Particle Physics, and to look for physics beyond the Standard Model up to a scale of 1TeV. For this purpose, electromagnetic (EM) calorimetry play a key role. The ATLAS Collaboration has chosen a Liquid Argon (LAr) option with lead as passive material. The liquid Argon Calorimeter is divided into two main subdetectors, the barrel and the end caps (EC). The design and construction of the LAr EM EC calorimeter is the responsability of the groups at Centre de Physique de Marseille (CPPM) and the Universidad Autonoma de Madrid (UAM)following the guideline developed by the research and development working, group 3 for LHC detectors (RD3). The sharing of responsabilities is such that CPPM provides spacers an...

  1. Improving Code Quality of the Compact Muon Solenoid Electromagnetic Calorimeter Control Software to Increase System Maintainability

    CERN Multimedia

    Holme, Oliver; Dissertori, Günther; Djambazov, Lubomir; Lustermann, Werner; Zelepoukine, Serguei

    2013-01-01

    The Detector Control System (DCS) software of the Electromagnetic Calorimeter (ECAL) of the Compact Muon Solenoid (CMS) experiment at CERN is designed primarily to enable safe and efficient operation of the detector during Large Hadron Collider (LHC) data-taking periods. Through a manual analysis of the code and the adoption of ConQAT [1], a software quality assessment toolkit, the CMS ECAL DCS team has made significant progress in reducing complexity and improving code quality, with observable results in terms of a reduction in the effort dedicated to software maintenance. This paper explains the methodology followed, including the motivation to adopt ConQAT, the specific details of how this toolkit was used and the outcomes that have been achieved. [1] ConQAT, Continuous Quality Assessment Toolkit; https://www.conqat.org/

  2. VHDL implementation of feature-extraction algorithm for the PANDA electromagnetic calorimeter

    Energy Technology Data Exchange (ETDEWEB)

    Guliyev, E. [Kernfysisch Versneller Instituut, University of Groningen, Zernikelaan 25, NL-9747 AA Groningen (Netherlands); Kavatsyuk, M., E-mail: m.kavatsyuk@rug.nl [Kernfysisch Versneller Instituut, University of Groningen, Zernikelaan 25, NL-9747 AA Groningen (Netherlands); Lemmens, P.J.J.; Tambave, G.; Loehner, H. [Kernfysisch Versneller Instituut, University of Groningen, Zernikelaan 25, NL-9747 AA Groningen (Netherlands)

    2012-02-01

    A simple, efficient, and robust feature-extraction algorithm, developed for the digital front-end electronics of the electromagnetic calorimeter of the PANDA spectrometer at FAIR, Darmstadt, is implemented in VHDL for a commercial 16 bit 100 MHz sampling ADC. The source-code is available as an open-source project and is adaptable for other projects and sampling ADCs. Best performance with different types of signal sources can be achieved through flexible parameter selection. The on-line data-processing in FPGA enables to construct an almost dead-time free data acquisition system which is successfully evaluated as a first step towards building a complete trigger-less readout chain. Prototype setups are studied to determine the dead-time of the implemented algorithm, the rate of false triggering, timing performance, and event correlations.

  3. VHDL implementation of feature-extraction algorithm for the PANDA electromagnetic calorimeter

    International Nuclear Information System (INIS)

    A simple, efficient, and robust feature-extraction algorithm, developed for the digital front-end electronics of the electromagnetic calorimeter of the PANDA spectrometer at FAIR, Darmstadt, is implemented in VHDL for a commercial 16 bit 100 MHz sampling ADC. The source-code is available as an open-source project and is adaptable for other projects and sampling ADCs. Best performance with different types of signal sources can be achieved through flexible parameter selection. The on-line data-processing in FPGA enables to construct an almost dead-time free data acquisition system which is successfully evaluated as a first step towards building a complete trigger-less readout chain. Prototype setups are studied to determine the dead-time of the implemented algorithm, the rate of false triggering, timing performance, and event correlations.

  4. A Tungsten / Scintillating Fiber Electromagnetic Calorimeter Prototype for a High-Rate Muon g-2 Experiment

    CERN Document Server

    McNabb, R; Crnkovic, J D; Hertzog, D W; Kiburg, B; Kunkle, J; Thorsland, E; Webber, D M; Lynch, K R; 10.1016/j.nima.2009.01.007

    2009-01-01

    A compact and fast electromagnetic calorimeter prototype was designed, built, and tested in preparation for a next-generation, high-rate muon g-2 experiment. It uses a simple assembly procedure: alternating layers of 0.5-mm-thick tungsten plates and 0.5-mm-diameter plastic scintillating fiber ribbons. This geometry leads to a detector having a calculated radiation length of 0.69 cm, a Moliere radius of 1.73 cm, and a measured intrinsic sampling resolution term of (11.8\\pm1.1)/\\sqrt{E(GeV)}, in the range 1.5 to 3.5 GeV. The construction procedure, test beam results, and GEANT-4 comparative simulations are described.

  5. Study of BESIII electromagnetic calorimeter performance with radiative lepton pair events

    CERN Document Server

    Prasad, Vindhyawasini; Ji, Xiaobin; Li, Weidong; Liu, Huaimin; Lou, Xinchou

    2016-01-01

    We study the photon detection efficiency and position resolution of the electromagnetic calorimeter (EMC) of the BESIII detector. The control samples of the initial-state-radiation (ISR) process of $e^+e^-\\rightarrow \\gamma \\mu^+\\mu^-$ at $J/\\psi$ and $\\psi(3770)$ resonances are used for the calibration of the photon cluster shapes and photon detection efficiency study. The photon detection efficiency is defined as the fraction of predicted photon, determined by performing a kinematic fit with the four momenta of two charged tracks only, matched with the actual photons in the EMC. The spatial resolution of the EMC is studied in polar ($\\theta$) and azimuthal ($\\phi$) angle directions in a cylindrical coordinate system centered at the interaction point, with z-axis along the beam direction.

  6. Lead tungstate crystals for the CMS electromagnetic calorimeter at the LHC

    CERN Document Server

    Dafinei, I

    2002-01-01

    With its over 80,000 scintillating lead tungstate PbWO/sub 4/ (PWO) crystals the CMS electromagnetic calorimeter (ECAL) will be the largest one ever constructed. It was designed to work in the demanding LHC environment and give a resolution of 0.5% for photon energies above 50 GeV/c. An important R & D effort was necessary in order to guarantee the production of PWO crystals able to satisfy such challenging constraints. The performance of the pre-production crystal batches (about 6000 barrel crystals) is consistent with the very strict quality parameters defined by the ECAL Collaboration. The meaning of quality controls as well as the main characteristics of these crystals are discussed. More, recent developments in the PWO crystal growth technology may speedup the crystal supplying for the ECAL construction. (15 refs).

  7. Maintaining and improving the control and safety systems for the Electromagnetic Calorimeter of the CMS experiment

    CERN Document Server

    Di Calafiori, Diogo Raphael; Dissertori, Günther; Holme, Oliver; Jovanovic, Dragoslav; Lustermann, Werner; Zelepoukine, Serguei

    2012-01-01

    This paper presents the current architecture of the control and safety systems designed and implemented for the Electromagnetic Calorimeter (ECAL) of the Compact Muon Solenoid (CMS) experiment at the Large Hadron Collider (LHC). An evaluation of system performance during all CMS physics data taking periods is reported, with emphasis on how software and hardware solutions are used to overcome limitations, whilst maintaining and improving reliability and robustness. The outcomes of the CMS ECAL Detector Control System (DCS) Software Analysis Project were a fundamental step towards the integration of all control system applications and the consequent piece-by-piece software improvements allowed a smooth transition to the latest revision of the system. The ongoing task of keeping the system in-line with new hardware technologies and software platforms specified by the CMS DCS Group is discussed. The structure of the comprehensive support service with detailed incident logging is presented in addition to a complet...

  8. The upgrade and re-validation of the Compact Muon Solenoid Electromagnetic Calorimeter Control System

    CERN Multimedia

    Holme, Oliver; Di Calafiori, Diogo; Dissertori, Günther; Djambazov, Lubomir; Jovanovic, Dragoslav; Lustermann, Werner; Zelepoukine, Serguei

    2013-01-01

    The Electromagnetic Calorimeter (ECAL) is one of the sub-detectors of the Compact Muon Solenoid (CMS) experiment at the Large Hadron Collider (LHC) at CERN. The Detector Control System (DCS) that has been developed and implemented for the CMS ECAL was deployed in accordance with the LHC schedule and has been supporting the CMS data-taking since LHC physics runs started in 2009. During these years, the control system has been regularly adapted according to operational experience and new requirements, always respecting the constraints imposed on significant changes to a running system. Several hardware and software upgrades and system extensions were therefore deferred to the first LHC Long Shutdown (LS1). This paper presents the main architectural differences between the system that supported the CMS ECAL during its first years and the new design for the coming physics runs after LS1. Details on the upgrade planning, including the certification methods performed in the CMS ECAL DCS laboratory facilities, repor...

  9. The CMS electromagnetic calorimeter calibration during Run I: progress achieved and expectations for Run II

    International Nuclear Information System (INIS)

    The CMS ECAL is a high-resolution, hermetic, and homogeneous electromagnetic calorimeter made of 75,848 scintillating lead tungstate crystals. It relies on precision calibration in order to achieve and maintain its design performance. A set of inter-calibration procedures is carried out to normalize the differences in crystal light yield and photodetector response between channels. Different physics channels such as low mass di-photon resonances, electrons from W and Z decays and the azimuthal symmetry of low energy deposits from minimum bias events are used. A laser monitoring system is used to measure and correct for response changes, which arise mainly from the harsh radiation environment at the LHC. The challenges of the different calibration techniques are discussed along with the performance evolution during Run I. The impact on physics performance is illustrated through the successful quest for the Higgs boson via its electromagnetic decays, and the subsequent mass measurement of the newly discovered particle. Conclusions are drawn for the performance to be expected from 2015 onwards, following the start of the LHC Run II

  10. Construction and testing of a large scale prototype of a silicon tungsten electromagnetic calorimeter for a future lepton collider

    International Nuclear Information System (INIS)

    The CALICE collaboration is preparing large scale prototypes of highly granular calorimeters for detectors to be operated at a future linear electron positron collider. After several beam campaigns at DESY, CERN and FNAL, the CALICE collaboration has demonstrated the principle of highly granular electromagnetic calorimeters with a first prototype called physics prototype. The next prototype, called technological prototype, addresses the engineering challenges which come along with the realisation of highly granular calorimeters. This prototype will comprise 30 layers where each layer is composed of four 9×9 cm2 silicon wafers. The front end electronics is integrated into the detector layers. The size of each pixel is 5×5 mm2. This prototype enters its construction phase. We present results of the first layers of the technological prototype obtained during beam test campaigns in spring and summer 2012. According to these results the signal over noise ratio of the detector exceeds the R and D goal of 10:1

  11. Study of an electromagnetic calorimeter for HADES (High Acceptance Di-Electron Spectrometer)

    International Nuclear Information System (INIS)

    The physics context of this work is the study of heavy ion collisions at relativistic energies where dielectron are chosen as a probe of the produced hot and dense nuclear matter. The experimental set-up in construction, the HADES spectrometer, is designed to study the decays of ρ, ω, φ mesons into e+e- pairs inside the excited medium. The goal is to show that restoration of chiral symmetry, theoretically predicted, manifests itself through the in-medium properties of particles, mesons in particular. Moreover, another goal is the study of electromagnetic form factors of hadrons which are involved in production of dileptons, test of a vector dominance model (VDM) in particular. In the case of the ω, its Dalitz decay is not well understood, and the use of a calorimeter could help to solve this mystery. In addition, a calorimeter could provide a redundant characterisation of electrons and positrons. Our work consisted in studying two materials: lead glass and lead tungstate. In the first case, only simulations have been made and led to the following conclusions: - energy resolution (σE/E) = 3.89/√E+5.2(%); - spatial resolution (σx,y) = 0.14/√E+0.73(cm); - possibility of separation e/h, e/μ; - accurate study of the ω for factor via its Dalitz decay. The study of lead tungstate began with test of quality and homogeneity of crystal samples in order to check that they have similar properties.. Experiments were performed at the MAMI microtron in Mainz (Germany) with electrons of 180, 450, 855 MeV energy and yielded the following results, never obtained so far: - energy resolution (σE/E) = 2.45/√E+97(%); - spatial resolution (≅ 0.3 cm); - time resolution (σ)∼1.41 ps at 8.55 MeV for T = 20 deg. C. (author)

  12. Improving the Prompt Electromagnetic Energy Component of Jet Energy Resolution with pi0 Fitting in High Granularity Electromagnetic Calorimeters

    CERN Document Server

    van Doren, Brian

    2012-01-01

    We investigate improving the hadronic jet energy resolution using mass-constrained fits of pi0 decays using high granularity electromagnetic calorimeters. Single pi0 studies have indicated a large potential for improvement in the energy resolution of pi0's, typically reducing the average energy resolution by a factor of two for 4 GeV pi0's. We apply this method to fully simulated multi-hadronic events with multiple pi0's with widely varying energies using the ILD00 detector model. Several methods for identifying the correct pairings of photons with parent pi0's were explored. The combinatorics become challenging as the number of pi0's increases and we employ the Blossom V implementation of Edmonds' matching algorithm for handling this. For events where both photons of the pi0 are detected, the resulting solutions lead to an improvement in the pi0 component of the event energy resolution for 91.2 GeV Z0 events from 18.0%/sqrt(E) to 13.9%/sqrt(E) using the ILD00 detector and its reconstruction algorithms. This ...

  13. Studies of lead tungstate crystal matrices in high energy beams for the CMS electromagnetic calorimeter at the LHC

    CERN Document Server

    Alexeev, G; Baillon, Paul; Barney, D; Bassompierre, Gabriel; Bateman, E; Bell, K W; Benhammou, Ya; Bloch, P; Bomestar, D; Borgia, B; Bourotte, J; Burge, S R; Cameron, W; Chipaux, Rémi; Cockerill, D J A; Connolly, J; Dafinei, I; Denes, P; Depasse, P; Deiters, K; Dobrzynski, Ludwik; El-Mamouni, H; Faure, J L; Felcini, Marta; Finger, M H; Flügel, T; Gautheron, F; Givernaud, Alain; Gninenko, S N; Godinovic, N; Graham, D J; Guillaud, J P; Guschin, E; Haguenauer, Maurice; Hillemanns, H; Hofer, H; Ille, B; Jääskeläinen, S; Katchanov, V A; Kennedy, B W; Kirn, T; Korzhik, M V; Lassila-Perini, K M; Lebeau, M; Lebrun, P; Lecoq, P; Lecoeur, Gérard; Lecomte, P; Leonardi, E; Locci, E; Loos, R; Ma, D; Martin, F; Mendiburu, J P; Musienko, Yu V; Nédélec, P; Nessi-Tedaldi, F; Newbold, D; Newman, H; Oukhanov, M; Pacciani, L; Peigneux, J P; Pirro, S; Popov, S; Puljak, I; Purves, C; Renker, D; Rondeaux, F; Rosso, E; Rusack, R W; Rykaczewski, H; Schmitz, D; Schneegans, M; Schwenke, J; Seez, Christopher J; Semeniouk, I N; Shagin, P M; Shevchenko, S; Shi, X; Sillou, D; Simohand, D; Singovsky, A V; Soric, I; Smith, B; Stephenson, R; Verrecchia, P; Vialle, J P; Virdee, Tejinder S; Zhu, R Y

    1997-01-01

    Using matrices of lead tungstate crystals energy resolutions better than 0.6% at 100 GeV have been achieved in the test beam in 1995. It has been demonstrated that a lead tungstate electromagnetic calorimeter read out by avalanche photodiodes can consistently achieve the excellent energy resolutions necessary to justify its construction in the CMS detector. The performance achieved has been understood in terms of the properties of the crystals and photodetectors.

  14. Contribution to the study of the readout of the electromagnetic calorimeter crystals in the CMS experiment at LHC

    International Nuclear Information System (INIS)

    The search for neutral Higgs boson through its decay into two photons provides a very promising signal for a mass between 90 and 150 GeV. It requires an electromagnetic calorimeter of very high resolution. The CMS (Compact Muon Solenoid) electromagnetic calorimeter must be made up of more than 80,000 lead tungstate crystals. In the central part (the barrel), the scintillation light readout is performed by means of avalanche photodiodes, a silicon photo-sensor with internal gain which is a relative novelty in high energy physics. Concerning the readout electronics, the energy available in the centre-of-mass (14 TeV) as well as the collision frequency (40 MHz) of LHC impose constraints with respect to the signal treatment up to the acquisition. The retained solution consists in pairing two avalanche photodiodes, the parameters of which (gain, temperature dependence, dark current, etc) must be controlled, and coupling them to a low noise preamplifier of high dynamical range (5 MeV - 2 TeV) followed by a four-slopes linear compressor and a analog-digital sampling converter of 12 bits, 40 MHz. The thesis presents the prototypes of different electromagnetic calorimeters tested in the high energy beam. An energy resolution of 0.6% at 100 GeV was obtained with a conventional readout circuitry, while the integrated associated circuits were radiation resistant

  15. The Forward Endcap of the Electromagnetic Calorimeter for the PANDA Detector at FAIR

    Science.gov (United States)

    Albrecht, Malte; PANDA Collaboration

    2015-02-01

    The versatile 4π-detector PANDA will be built at the Facility for Antiproton and Ion Research (FAIR), an accelerator complex, currently under construction near Darmstadt, Germany. A cooled antiproton beam in a momentum range of 1.5 - 15GeV/c will be provided by the High Energy Storage Ring (HESR). All measurements at PANDA rely on an excellent performance of the detector with respect to tracking, particle identification and energy measurement. The electromagnetic calorimeter (EMC) of the PANDA detector will be equipped with 15744 PbWO4 crystals (PWO-II), which will be operated at a temperature of - 25° C in order to increase the light output. The design of the forward endcap of the EMC has been finalized. The crystals will be read out with Large Area Avalanche Photo Diodes (LAAPDs) in the outer regions and with Vacuum Photo Tetrodes (VPTTs) in the innermost part. Production of photosensor units utilizing charge integrating preamplifiers has begun. A prototype comprised of 216 PbWO4 crystals has been built and tested at various accelerators (CERN SPS, ELSA/Bonn, MAMI/Mainz), where the crystals have been exposed to electron and photon beams of 25MeV up to 15GeV. The results of these test measurements regarding the energy and position resolution are presented.

  16. The γn -->K0 Λ photoproduction studied with an electromagnetic calorimeter complex FOREST

    Science.gov (United States)

    Tsuchikawa, Yusuke; Hashimoto, Ryo; He, Qinghua; Ishikawa, Takatsugu; Masumoto, Shinichi; Miyabe, Manabu; Muramatsu, Norihito; Shimizu, Hajime; Tajima, Yasuhisa; Yamazaki, Hirohito; Yamazaki, Ryuji; Forest Collaboration

    2014-09-01

    Nucleon resonance have been experimentally studied by means of meson production reactions for understanding low-energy scale QCD. Photoproduction is one of the useful tools to reveal properties of excited nucleons. Indeed, the π and η photoproduction reactions have been intensively investigated until now. Kaon photoproduction is the best probe to study highly excited nucleons, which hardly couple to πN and ηN . Simultaneous K0 Λ production is more advantageous than K+ Λ production which is reported by many experimental groups. It is because the kaon exchange is forbidden in the K0 Λ photoproduction, and because Born term contribution is small. The γd --> (K0 Λ) p --> (π0π0 pπ-) p reaction is experimentally investigated with an electromagnetic calorimeter FOREST at Research Center for Electron Photon Science, Tohoku University. The K0 and Λ particles are clearly observed in π0π0 and π- p invariant mass distributions. We will present the current status of the exclusive γn -->K0 Λ reaction.

  17. Maintaining and improving the control and safety systems for the Electromagnetic Calorimeter of the CMS experiment

    Science.gov (United States)

    Di Calafiori, D.; Adzic, P.; Dissertori, G.; Holme, O.; Jovanovic, D.; Lustermann, W.; Zelepoukine, S.

    2012-12-01

    This paper presents the current architecture of the control and safety systems designed and implemented for the Electromagnetic Calorimeter (ECAL) of the Compact Muon Solenoid (CMS) experiment at the Large Hadron Collider (LHC). An evaluation of system performance during all CMS physics data taking periods is reported, with emphasis on how software and hardware solutions are used to overcome limitations, whilst maintaining and improving reliability and robustness. The outcomes of the CMS ECAL Detector Control System (DCS) Software Analysis Project were a fundamental step towards the integration of all control system applications and the consequent piece-by-piece software improvements allowed a smooth transition to the latest revision of the system. The ongoing task of keeping the system in-line with new hardware technologies and software platforms specified by the CMS DCS Group is discussed. The structure of the comprehensive support service with detailed incident logging is presented in addition to a complete test setup for reproducing failures and for testing solutions prior to deployment into production. A correlation between the acquired experience, the development of new software tools and a reduction in the DCS support load is highlighted.

  18. Maintaining and improving the control and safety systems for the Electromagnetic Calorimeter of the CMS experiment

    International Nuclear Information System (INIS)

    This paper presents the current architecture of the control and safety systems designed and implemented for the Electromagnetic Calorimeter (ECAL) of the Compact Muon Solenoid (CMS) experiment at the Large Hadron Collider (LHC). An evaluation of system performance during all CMS physics data taking periods is reported, with emphasis on how software and hardware solutions are used to overcome limitations, whilst maintaining and improving reliability and robustness. The outcomes of the CMS ECAL Detector Control System (DCS) Software Analysis Project were a fundamental step towards the integration of all control system applications and the consequent piece-by-piece software improvements allowed a smooth transition to the latest revision of the system. The ongoing task of keeping the system in-line with new hardware technologies and software platforms specified by the CMS DCS Group is discussed. The structure of the comprehensive support service with detailed incident logging is presented in addition to a complete test setup for reproducing failures and for testing solutions prior to deployment into production. A correlation between the acquired experience, the development of new software tools and a reduction in the DCS support load is highlighted.

  19. The Electromagnetic Calorimeter for the T2K Near Detector ND280

    CERN Document Server

    Allan, D; Angelsen, C; Barker, G J; Barr, G; Bentham, S; Bertram, I; Boyd, S; Briggs, K; Calland, R G; Carroll, J; Cartwright, S L; Chavez, C; Christodoulou, G; Coleman, J; Cooke, P; Davies, G; Densham, C; Dobson, J; Duboyski, T; Durkin, T; Evans, D L; Finch, A; Fitton, M; Gannaway, F C; Grant, A; Grant, N; Grenwood, S; Guzowski, P; Hadley, D; Haigh, M; Harrison, P F; Hatzikoutelis, A; Haycock, T D J; Hyndman, A; Ilic, J; Ives, S; Kaboth, A C; Kasey, V; Kellet, L; Khaleeq, M; Kogan, G; Kormos, L L; Lawe, M; Lawson, T B; Lister, C; Litchfield, R P; Lockwood, M; DiLodovico, F; Malek, M; Maryon, T; Masliah, P; Mavrokoridis, K; McCauley, N; Mercer, I; Metelko, C; Morgan, B; Morris, J; Muir, A; Murdoch, M; Nicholls, T; Noy, M; O'Keeffe, H M; Owen, R A; Payne, D; Pearce, G F; Perkin, J D; Poplawska, E; Preece, R; Qian, W; Ratoff, P; Raufer, T; Raymond, M; Reeves, M; Richards, D; Rooney, M; Sacco, R; Sadler, S; Schaack, P; Scott, M; Scully, D I; Short, S; Siyad, M; Smith, R; Still, B; Sutcliffe, P; Taylor, I J; Terri, R; Thompson, L F; Thorley, A; Thorpe, M; Timis, C; Touramanis, C; Uchida, M A; Uchida, Y; Vacheret, A; VanSchalkwyk, J F; Veledar, O; Waldron, A V; Ward, M A; Ward, G P; Wark, D; Wascko, M O; Weber, A; West, N; Whitehead, L H; Wilkinson, C; Wilson, J R

    2013-01-01

    The T2K experiment studies oscillations of an off-axis muon neutrino beam between the J-PARC accelerator complex and the Super-Kamiokande detector. Special emphasis is placed on measuring the mixing angle theta_13 by observing electron neutrino appearance via the sub-dominant muon neutrino to electron neutrino oscillation, and searching for CP violation in the lepton sector. The experiment includes a sophisticated, off-axis, near detector, the ND280, situated 280 m downstream of the neutrino production target in order to measure the properties of the neutrino beam and to understand better neutrino interactions at the energy scale below a few GeV. The data collected with the ND280 are used to study charged- and neutral-current neutrino interaction rates and kinematics prior to oscillation, in order to reduce uncertainties in the oscillation measurements by the far detector. A key element of the near detector is the ND280 electromagnetic calorimeter (ECal), consisting of active scintillator bars sandwiched betw...

  20. The selective read-out processor for the CMS electromagnetic calorimeter

    CERN Document Server

    Girão de Almeida, Nuño Miguel; Faure, Jean Louis; Gachelin, Olivier; Gras, Philippe; Mandjavidze, Irakli; Mur, Michel; Varela, João

    2005-01-01

    This paper describes the selective read-out processor (SRP) proposed for the electromagnetic calorimeter (ECAL) of the Compact Muon Solenoid (CMS) experiment at LHC (CERN). The aim is to reduce raw ECAL data to a level acceptable by the CMS data acquisition (DAQ) system. For each positive level 1 trigger, the SRP is guided by trigger primitive generation electronics to identify ECAL regions with energy deposition satisfying certain programmable criteria. It then directs the ECAL read-out electronics to apply predefined zero suppression levels to the crystal data, depending whether the crystals fall within these regions or not. The main challenges for the SRP are some 200 high speed (1.6 Gbit/s) I/O channels, asynchronous operation at up to 100 kHz level 1 trigger rate, a 5- mu s real-time latency requirement and a need to retain flexibility in choice of selection algorithms. The architecture adopted for the SRP is based on modern parallel optic pluggable modules and high density field programmable gate array ...

  1. The Forward Endcap of the Electromagnetic Calorimeter for the PANDA Detector at FAIR

    International Nuclear Information System (INIS)

    The versatile 4π-detector PANDA will be built at the Facility for Antiproton and Ion Research (FAIR), an accelerator complex, currently under construction near Darmstadt, Germany. A cooled antiproton beam in a momentum range of 1.5 – 15GeV/c will be provided by the High Energy Storage Ring (HESR). All measurements at PANDA rely on an excellent performance of the detector with respect to tracking, particle identification and energy measurement. The electromagnetic calorimeter (EMC) of the PANDA detector will be equipped with 15744 PbWO4 crystals (PWO-II), which will be operated at a temperature of – 25° C in order to increase the light output. The design of the forward endcap of the EMC has been finalized. The crystals will be read out with Large Area Avalanche Photo Diodes (LAAPDs) in the outer regions and with Vacuum Photo Tetrodes (VPTTs) in the innermost part. Production of photosensor units utilizing charge integrating preamplifiers has begun. A prototype comprised of 216 PbWO4 crystals has been built and tested at various accelerators (CERN SPS, ELSA/Bonn, MAMI/Mainz), where the crystals have been exposed to electron and photon beams of 25MeV up to 15GeV. The results of these test measurements regarding the energy and position resolution are presented

  2. Visit of Peters Higgs at Point 2 ALICE Experiment - British theoretical physicist, He worked on proposals to unify the weak and the electromagnetic forces into a single electroweak theory, The Boson of Higgs.

    CERN Multimedia

    Mona Schweizer

    2008-01-01

    Visit of Peters Higgs at Point 2 ALICE Experiment - British theoretical physicist, He worked on proposals to unify the weak and the electromagnetic forces into a single electroweak theory, The Boson of Higgs.

  3. Design and Electronics Commissioning of the Physics Prototype of a Si-W Electromagnetic Calorimeter for the International Linear Collider

    CERN Document Server

    Repond, J; Cass, S; Yu, J; Hawkes, C M; Mikami, Y; Miller, O; Watson, N K; Wilson, J A; Mavromanolakis, G; Thomson, M A; Ward, D R; Yan, W; Badaud, F; Boumediene, D; Crloganu, C; Cornat, R; Gay, P; Gris, P; Manen, S; Morisseau, F; Royer, L; Blazey, G C; Chakraborty, D; Dyshkant, A; Francis, K; Hedin, D; Lima, G; Zutshi, V; Hostachy, J Y; Morin, L; Garutti, E; Korbel, V; Sefkow, F; Groll, M; Kim, G; Kim, D W; Lee, K; Lee, S; Kawagoe, K; Bowerman, Y; Tamura, D A; Dauncey, P D; Magnan, A M; Noronha, C; Yilmaz, H; Zorba, O; Bartsch, V; Butterworth, J M; Postranecky, M; Warren, M; Wing, M; Faucci Giannelli, M; Green, M G; Salvatore, F; Wu, T; Bailey, D; Barlow, R J; Kelly, M; Snow, S; Thompson, R J; Danilov, M; Kochetkov, V; Cheremushkinskaya, B; Baranova, N; Ermolov, P; Karmanov, D; Korolev, M; Merkin, M; Lomonosov, A; Voronin, M V; Bouquet, B; Callier, S; Dulucq, F; Fleury, J; Li, H; Martin-Chassard, G; Richard, F; dela Taille, C; Pöschl, R; Raux, L; Ruan, M; Seguin-Moreau, N; Wicek, F; Zhang, Z; Anduze, M; Boudry, V; Brient, J C; Clerc, C; Gaycken, G; Jauffret, C; Karar, A; Mora de Freitas, P; Musat, G; Reinhard, M; Rougé, A; Sanchez, A L; Vanel, J C; Videau, H; Zácek, J; Cvach, J; Gallus, P; Havranek, M; Janata, M; Marcisovsky, M; Polak, I; Popule, J; Tomasek, L; Tomasek, M; Ruzicka, P; Sícho, P; Smolik, J; Vrba, V; Zaleisak, J; Arestov, Yu; Baird, A; Halsall, R N; Nam, S W; Park, I H; Yang, J

    2008-01-01

    The CALICE collaboration is studying the design of high performance electromagnetic and hadronic calorimeters for future International Linear Collider detectors. For the electromagnetic calorimeter, the current baseline choice is a high granularity sampling calorimeter with tungsten as absorber and silicon detectors as sensitive material. A ``physics prototype'' has been constructed, consisting of thirty sensitive layers. Each layer has an active area of 18x18 cm2 and a pad size of 1x1 cm2. The absorber thickness totals 24 radiation lengths. It has been exposed in 2006 and 2007 to electron and hadron beams at the DESY and CERN beam test facilities, using a wide range of beam energies and incidence angles. In this paper, the prototype and the data acquisition chain are described and a summary of the data taken in the 2006 beam tests is presented. The methods used to subtract the pedestals and calibrate the detector are detailed. The signal-over-noise ratio has been measured at 7.63 +/- 0.01. Some electronics f...

  4. The electron-photon decay of Higgs boson. Optimization and calibration of electromagnetic calorimeter of ATLAS experiment

    International Nuclear Information System (INIS)

    ATLAS is one of the two large experiments which will be placed along the LHC, the CERN's future proton-proton collider. The search for Higgs boson is one of its objectives. The Higgs boson is introduced in the Standard Model to explain the electroweak symmetry breaking and the fermions masses. The hadronic background naturally generated by the collider, constraints to look for the photonic and leptonic Higgs boson decay modes, especially in its electronic mode. In this perspective, the ATLAS electromagnetic calorimeter should be specifically optimized and calibrated. The optimization bears on the readout electronics to minimize the measurement smearing introduced by radiations, pile-up noise, electronics noise, as well as, quantization noise. We will see in this thesis that the simultaneous use of warm preamplifiers, of optimal filtering techniques and of multi-gains system can fulfill such an optimization. Calibrating the electromagnetic calorimeter consists in determining the correspondence between signals coming from the calorimeter and energies of electrons and photons at their creation. If a first calibration can be obtained in test-beam area and transported in situ by using an electronic calibration system, final correction should be done. We will see in this thesis that the use of a physics signal, Z0 -> e+e-, as an absolute calibrating signal can perform such a final adjustment. (author)

  5. The CMS Electromagnetic Calorimeter: Results on Crystal Measurements, Quality Control and Data Management in the Rome Regional Center

    CERN Document Server

    Costantini, S

    2004-01-01

    The barrel of the CMS electromagnetic calorimeter is currently under construction and will contain 61200 PbWO4 crystals. Half of them are being fully characterized for dimensions, optical properties and light yield in the INFN-ENEA Regional Center near Rome. We describe the setup of an automatic quality control system for the crystal measurements and the present results on their qualification, as well as the REDACLE project, which has been developed to control and ease the production process. As it will not be possible to precalibrate the whole calorimeter,the crystal measurements and quality checks performed at the Regional Center will be crucial to provide a basis for fast in-situ calibration with particles. REDACLE is at the same time a fast database and a data management system, where the database and the workflow structures are decoupled, in order to obtain the best flexibility.

  6. The response to high magnetic fields of the vacuum phototriodes for the Compact Muon Solenoid endcap electromagnetic calorimeter

    International Nuclear Information System (INIS)

    The endcap electromagnetic calorimeter of the compact muon solenoid detects particles with the dense fast scintillator lead tungstate (PbWO4). Due to the low light yield of this scintillator, photodetectors with internal gain are required. Silicon avalanche photodiodes cannot be used in the endcap region due to the intense neutron flux. Following an extensive R and D programme, 26 mm diameter single-stage photomultipliers (vacuum phototriodes) have been chosen as the photodetector in the endcap region. The first 1400 production devices are currently being evaluated following recent tests of a pre-production batch of 500 tubes. Tubes passing our acceptance tests have responses, averaged over the angular acceptance of the endcap calorimeter, corresponding to the range 20-55 electrons/MeV deposited in PbWO4. These phototriodes operate, with a typical gain of 10, in magnetic fields up to 4 T

  7. Study of the overlapping zones of the ALEPH electromagnetic calorimeter. Analysis of the light Higgs boson detection possibilities at LEP

    International Nuclear Information System (INIS)

    The results of the work performed on the overlapping zones of an electromagnetic calorimeter are presented. The aim of the study is the development of an energy correction algorithm, taking into account the calorimeter granularity. The study is based on test beam data from the Monte Carlo detector. The developed algorithm allows energy correction better than seven percent and the improvement of the resolution. The research possibilities of Higgs boson at LEP are analyzed. The boson's mass is expected to be between the decay threshold of a pair of electrons and a pair of muons. The Higgs boson lifetime would be related to a secondary decay vertex. The Higgs boson production associated to a neutrino pair is also analyzed

  8. A novel strip energy splitting algorithm for the fine granular readout of a scintillator strip electromagnetic calorimeter

    International Nuclear Information System (INIS)

    We describe an algorithm which has been developed to extract fine granularity information from an electromagnetic calorimeter (ECAL) with strip-based readout. Such a calorimeter, based on scintillator strips, is being developed to apply particle flow reconstruction to future experiments in high energy physics. The application of this algorithm to 100 GeV hadronic jets in an ECAL with 45×5 mm2 transverse segmentation improves the energy resolution from 3.6% to 3.0%, to be compared to the resolution of 2.9% achieved by an ECAL with 5×5 mm2 segmentation. The performance can be further improved by the use of 10×10 mm2 tile-shaped layers interspersed between strip layers

  9. The supermodule insertion tool of the CMS electromagnetic calorimeter and the first trial insertion of a supermodule.

    CERN Multimedia

    Maximilien Brice

    2006-01-01

    The first trial insertion of a complete Electromagnetic Calorimeter (ECAL) "supermodule" (1700 lead-tungstate crystals, with support structures, light detectors (avalanche photodiodes), readout electronics and cooling system) was performed on 1st March. This delicate operation - sliding a 2-tonne 3m-long object onto support rails (in real life these are attached to the barrel hadron calorimeter (HCAL)) - made use of a custom designed "squirrel cage". The rotatable squirrel cage allows the insertion of any supermodule into any of the 18 positions, including very fine (sub-mm) adjustments. The first supermodule will be inserted into the real HCAL later this month in preparation for the "magnet test and cosmic-ray challenge" (MTCC). In the first image the supermodule is in the centre and the alignment disks are highlighted by the flash.

  10. Role of the CMS electromagnetic calorimeter in the hunt for the Higgs boson through the two-gamma decay mode

    International Nuclear Information System (INIS)

    The Electromagnetic Calorimeter (ECAL) of the Compact Muon Solenoid (CMS) experiment at the LHC is a hermetic, fine grained, homogeneous calorimeter, comprising 75848 lead tungstate scintillating crystals, located inside the CMS superconducting solenoidal magnet. The scintillation light is detected by avalanche photodiodes in the barrel section and by vacuum photo triodes in the two end cap sections. A silicon/lead pre-shower detector is installed in front of the end caps in order to improve γ/π0 discrimination. Precise calibration of the ECAL detector is required. This includes inter-calibration, to account for the differing response of channels, and calibration of the energy scale. The performance obtained during the LHC physics runs in 2011 and 2012 is presented and the role of the ECAL in the hunt for the Higgs boson, through the two-gamma decay mode, is discussed.

  11. The ALICE Heavy-Ion Experiment at the CERN LHC

    CERN Document Server

    CERN. Geneva

    1993-01-01

    ALICE (A Large Ion Collider Experiment) is a dedicated heavy-ion detector designed to exploit the physics potential of nucleus-nucleus interactions at the LHC. As a general-purpose experiment, it will allow a comprehensive study of hadrons, electrons and photons produced in the collision of heavy nuclei, up to the highest particle multiplicities anticipated at the LHC. The central part of ALICE, which covers (90±45)¡ (<0.9) over the full azimuth, is embedded in a large magnet with a weak solenoidal field. The base-line design consists (from inside out) of a high-resolution inner tracking system, a cylindrical TPC, a particle identification array (TOF or RICH detectors), and a single-arm electromagnetic calorimeter. Possible upgrades under study include large-acceptance electromagnetic calorimeters and a muon identification system. We will trigger on central collisions with a zero degree calorimeter and measure multiplicity distributions over a large fraction of the available phase space.

  12. Electromagnetic calorimeter for the Heavy Photon Search Experiment at Jefferson Lab

    Energy Technology Data Exchange (ETDEWEB)

    Buchanan, Emma [Univ. of Glasgow, Scotland (United Kingdom)

    2014-11-01

    The Heavy Photon Search Experiment (HPS) seeks to detect a hypothesised hidden sector boson, the A', predicted to be produced in dark matter decay or annihilation. Theories suggest that the A' couples weakly to electric charge through kinetic mixing, allowing it, as a result, to decay to Standard Matter (SM) lepton pair, which may explain the electron and positron excess recently observed in cosmic rays. Measuring the lepton pair decay of the A' could lead to indirect detection of dark matter. The HPS experiment is a fixed target experiment that will utilize the electron beam produced at the Thomas Jefferson National Accelerator Facility (Jefferson Lab). The detector set-up includes a silicon vertex tracker (SVT) and an Electromagnetic Calorimeter (ECal). The ECal will provide the trigger and detect e+e- pairs and its construction and testing forms the focus of this thesis. The ECal consists of 442 PbWO4- tapered crystals with a length 16cm and a 1.6x1.6cm2 cross-section, stacked into a rectangular array and are coupled to Large Area APDs and corresponding pre-amplifiers. Supplementary to the ECal is a Light Monitoring System (LMS) consisting of bi-coloured LEDs that will monitor changes in APD gain and crystal transparency due to radiation damage. Before construction of the ECal each of the components were required to be individually tested to determine a number of different characteristics. Irradiation tests were performed on PbWO4 ECal crystals and, as a comparison, one grown by a different manufacturer to determine their radiation hardness. A technique for annealing the radiation damage by optical bleaching, which involves injecting light of various wavelengths into the crystal, was tested using the blue LED from the LMS as a potential candidate. The light yield dependence on temperature was also measured for one of the PbWO4 crystal types. Each APD was individually tested to determine if they

  13. Study of the optical monitoring system of the scintillating crystal involved in the electromagnetic calorimeter of CMS experiment

    International Nuclear Information System (INIS)

    The prospect of the experimental discovery of the Higgs boson is one of the motivations to build the large hadron collider (LHC). Proton beams will collide and the emitted particles will be detected by ATLAS and CMS equipment. In each detector the electromagnetic calorimeter will allow the characterisation of the 2 photons coming from one of the disintegration channels of the Higgs boson. CMS collaboration has chosen an homogeneous calorimeter fitted with PbWO4 crystals. Each crystal with its photodetector and its electronic device forms one detection channel. The resolution of the detection channels should not deteriorate all along the operating time. The optical monitoring system of the crystals logs then controls the response of each detection channel in order to allow an accurate calibration of the calorimeter. The optical properties, the resistance to irradiation of PbWO4 crystals and the modelling of light collection are investigated in this work. The description of the different components of the optical monitoring system highlights the technical difficulties we had to challenge. An experimental testing bench has been set up to study the coupling between the scintillation signal and the signal that feeds the monitoring system, this coupling has been studied under irradiation in the conditions of CMS operating. (A.C.)

  14. Forward production of J//psi/ in hadronic interactions and calibration of a large BGO electromagnetic calorimeter

    International Nuclear Information System (INIS)

    In the first part of this thesis, we describe an analysis of J//psi/ produced in the forward direction in the reaction πN → μ+μ/sup /minus//X. The data for this analysis were collected by Fermilab experiment E615. We measured the cross section for J//psi/ production and the angular distribution of muons from J//psi/ decay. We found evidence for longitudinal polarization of J//psi/ produced in the kinematic limit where the J//psi/ carries a large fraction of the incident pion's longitudinal momentum. This is the first experimental observation of longitudinal polarization of J//psi/ produced in hadronic interactions. In the second part of this thesis, we describe the construction and calibration of a large Bismuth Germanante (BGO) electromagnetic calorimeter designed to study e+e/sup /minus// collisions at center-of-mass energies near the Z0 mass. The calorimeter is a subdetector of the L3 detector and will be installed in the Large Electron Positron collider (LEP) of the European Organization for Nuclear Research. We present the results of a calibration of the calorimeter in an electron test beam at electron energies of 2, 10, and 50 GeV. We show that the accuracy of the calibration is 0.8% at 2 GeV, improving to better than 0.5% at 10 GeV and above. 65 refs., 72 figs., 21 tabs

  15. Alice and Alice

    Directory of Open Access Journals (Sweden)

    Maria Augusta Vilalba Nunes

    2012-05-01

    Full Text Available Two Alices. One follows a rabbit and falls into a hole that seems to have no end, enters into another world, a world out of control, out of context, a world never seen before. The other does not fall anywhere, she only exists in the world. In this world. A world under control? Within the context? It would appear so. But Alice is only ten years old, what would she know about the control and the context of the world, besides the reference that those older and supposedly wiser give her? However, for the adults surrounding her, the world is not under control, their own lives are not. Alice, far from being naive knows that, and thus, her world turns confused, or rather, it turns confused by the complexity of adult relationships that she must undergo. The Alices and their small bodies immersed in these uncontrolled worlds turn their problematic situation into a ludic situation, a game, a playing, within the ease of doing this kind of reversal that only children and the so called crazy have. Thus, Alice and Alice makes a crossing between these two distant worlds characters, but close at the same time. One Alice literature, the other film. One Lewis Carroll, the other Wim Wenders. This essay investigates the relation regarding to the similarities and the discrepancies between the two forms of language, but mainly, the relation between the conditions of the two girls. Based on Deleuze's thought on the reversal of Cartesian thought examined on Carroll’s book, this work will ponder the situations experienced by Wenders’ Alice and consider the possibility that real life can be full of paradoxes, games and situations that move away from reasoning.

  16. In-situ measurement of the electromagnetic calorimeter uniformity and search for the first di-photon events in ATLAS

    International Nuclear Information System (INIS)

    The search for a light Higgs boson in the H → γγ channel with the ATLAS experiment demands excellent performance of the electromagnetic calorimeter, as well as a good understanding of the backgrounds. This work is organized in two main points. One point is about the operation and performance of the electromagnetic calorimeter. First, developments are brought to the Liquid Argon calorimeters online reconstruction code, and its algorithms are validated, which includes the development of an online monitoring. Then, two independent measurements of the electromagnetic calorimeter uniformity of response are proposed: one with the signal deposited by cosmic muons on an effective coverage of about 20%, and one with π0 → γγ events in the first collisions at √(ps) = 7 TeV with an integrated luminosity of L = 414.8 μb-1. The measurements with cosmic muons show that the non-uniformities in the η direction are found to not exceed 1.0% in the middle layer and 1.7% in the first layer, at the 95% Confidence Level. With the π0 → γγ events, these results are improved and lead to a dispersion of the response between data and simulation of less than 0.7% in the three cryostats (barrel and end-caps), which is the level expected at the start-up of the experiment. The second main point of this thesis is the extraction of a non-resonant di-photon signal, for which two methods are presented. The first method is a two-step purity measurement using an extrapolation of the background from background-enriched control regions, into a signal region. The second method uses a 4*4 efficiency matrix fully determined from simulation and is applied on an event-by-event basis. These methods are applied to collision data corresponding to L = 2.82 pb-1. A direct di-photon signal yield of 108.6 ± 19.5 (stat.) ± 34.5 (syst.) is extracted, with a purity of (65.1 ± 8.6 (stat.) ± 8.7 (syst.))%. (author)

  17. Performance of the CMS electromagnetic calorimeter and its role in the hunt for the Higgs boson in the two-photon channel

    International Nuclear Information System (INIS)

    The electromagnetic calorimeter of CMS (ECAL) is a hermetic, fine grained and homogeneous calorimeter containing 75848 lead-tungstate (PbWO4) crystals, completed by a silicon preshower installed in front of the endcaps. The ECAL sensitivity to decay modes with electromagnetic objects in the final state, such as narrow resonances decaying into two photons, is achieved through its excellent energy and position resolution. The ECAL performance from 2010–2012 is presented in detail and its role in the hunt for the Higgs boson, through the 2-photon decay mode, is discussed

  18. Inter-calibration of the CMS Barrel Electromagnetic Calorimeter Using $\\pi^0 \\rightarrow \\gamma\\gamma$ Decays

    CERN Document Server

    Yang, Y

    2008-01-01

    Inter-calibrating the electromagnetic calorimeter of the CMS detector {\\it in situ} at the LHC to the design goal of $0.5\\% $ precision is going to be important to fully exploit the physics reach of the detector, particularly for the discovery of the Higgs boson in the two-photon decay channel. In this paper we evaluate the potential of a novel calibration technique that makes use of photon pairs produced in neutral pion decays, $\\pi^0 \\rightarrow \\gamma \\gamma$. Such photon pairs will be selected from the QCD events accepted by the Level-1 triggers using an online filter farm. Assuming a Level-1 trigger rate of 12.5~kHz, the rate of suitable neutral pions is found to be about 0.9~kHz. We show that 95\\% of the barrel electromagnetic calorimeter can be calibrated to at least 1\\% (0.5\\%) precision after several days (weeks) of data-taking in the low-luminosity scenario of LHC, $\\mathcal{L} = 2 \\cdot 10^{33} \\, \\mathrm{cm}^{-2}\\,\\mathrm{s}^{-1}$. In addition, we show that a 1\\% calibration precision is achieved ...

  19. Inter-calibration of the CMS Barrel Electromagnetic Calorimeter Using $\\pi^0 \\rightarrow \\gamma\\gamma$ Decays

    CERN Document Server

    Litvin, V

    2007-01-01

    Precise calibration of the CMS electromagnetic calorimeter must be performed in situ at the LHC in order to fully exploit the physics reach of the CMS experiment. Achieving the design-goal calibration precision of 0.5\\% will be particularly important for a discovery of the Higgs boson in the two-photon decay channel. In this paper we evaluate the potential of a novel calibration technique that makes use of photon pairs produced in neutral pion decays, $\\pi^0 \\to \\gamma\\gamma$ . Such photon pairs will be selected from the QCD events accepted by the Level 1 triggers using an online filter farm. Assuming a Level 1 trigger rate of 10 kHz, the rate of suitable neutral pions is found to be as high as 1 kHz. We show that 95\\% of the barrel electromagnetic calorimeter can be calibrated to at least a 1\\% (0.5\\%) precision after several days (weeks) of data-taking in the low-luminosity scenario of LHC, ${\\cal L} = 2 \\cdot 10^{33}$, cm$^{-2}$ s$^{-1}$. In addition, we report on the successful tests of the $\\pi^0$ recons...

  20. Electromagnetic calorimeter and accurate measurement with the ATLAS detector of the LHC collider; Calorimetrie electromagnetique et mesures de precision avec le detecteur ATLAS aupres du collisionneur LHC

    Energy Technology Data Exchange (ETDEWEB)

    Pralavorio, P

    2007-06-15

    The main purpose of the ATLAS experiment is the understanding of the underlying mechanisms that drive the breaking of the electro-weak symmetry through the discovery of Higgs bosons. An important element to achieve this aim was the design of an electromagnetic calorimeter able to investigate the decay channels: H {yields} {gamma}{gamma} and H {yields} 4e. The high performance of the calorimeter will allow us to get a better accuracy on the measuring values of W and top masses which is essential to indirectly constrain the mass of the Higgs. In the same way, accurate measurements of top and W properties during the decays of top and tWb vertex will be necessary to question the standard model and to see beyond. The author has been working for 9 years in the ATLAS project, he has been involved in the design, construction, qualification and testing phases of the electromagnetic calorimeter of ATLAS. This document is a detailed presentation of the calorimeter, of its qualification and of its expectations when LHC is operating. This document is organized into 4 chapters: 1) assets and weaknesses of the standard model, 2) the ATLAS experiment, 3) the electromagnetic calorimeter, and 4) accurate measurements with ATLAS. This document presented before an academic board will allow its author to manage research works and particularly to tutor thesis students. (A.C.)

  1. Review of the crosstalk in the module 0 of the Electromagnetic Endcap Calorimeter

    CERN Document Server

    Pralavorio, Pascal

    2001-01-01

    This note presents a complete crosstalk map of the endcap calorimeter module 0. Results on test benches performed on mother boards (old and new), proven to be responsible of most of the crosstalk in Middle and Back samplings, are also shown.

  2. Calibration of the electromagnetic calorimeter of the Atlas detector: reconstruction of events with non-pointing photons in the frame of a GMSB supersymmetric model

    International Nuclear Information System (INIS)

    The analysis of test-beam data is focused on the calibration of the ATLAS electromagnetic calorimeter. An electrical model has been developed to predict the shape of the physics pulse out of the calibration signal in order to produce optimal filtering coefficients. They are used to compute energy while minimizing electronic noise and getting rid of any possible time shift. Using these coefficients, the uniformity response is 0.6%, in agreement with the 0.7% global constant term required for the whole calorimeter. The study of non pointing photon is driven by the detection of long lived neutralinos predicted by GMSB SUSY models. A systematic study with a detailed simulation of the ATLAS detector was performed to determine the electromagnetic calorimeter angular resolution for such photons. Results were used to parametrized the detector response and to reconstruct SUSY events from this model. (author)

  3. Low-noise current preamplifier for the electromagnetic calorimeter of ATLAS

    International Nuclear Information System (INIS)

    The ATLAS detector at CERN is an experiment on the future LHC collider, which seeks new particles, like the Higgs boson, to complete the standard model and develop the supersymmetry model. An important sub-detector in ATLAS is the Liquid Argon calorimeter which measures the energy of electrons and photons. The calorimeter precision is partially limited by the electronic noise of the input preamplifiers, which is then particularly a point of attention. The main study of this thesis is a 'warm' current preamplifier ('0T') placed outside the cryostat, the signal being driven on cables. First, the main characteristics of another type of preamplifier placed in the calorimeter are studied. Then the 0T is modelled, particularly the effects of a cable on the electronic noise and the signal. Different versions are studied, whose measurements are in good agreement with expected values. In the ATLAS Liquid Argon calorimeter conditions the 0T performance are very competitive with a 'cold' preamp, and has the advantage of reliability. Also their location outside the cryostat allows maintenance. But the cable impedance is higher than the input impedance of a cold preamplifier, which is a drawback according to capacitive crosstalk between neighbouring channels. The signal crosstalk is higher, but acceptable. As well, the noise correlation between two channels as a function of cable length is shown as negligible for cable lengths used. The noise autocorrelation function is also studied to optimize a multi-sampling filtering. The model and measurements are in excellent agreement. The 0T has been chosen to equip 200,000 channels of the ATLAS Liquid Argon calorimeter. (author)

  4. Inclusive production of \\pi^0 in pp collisions at 0.9 and 7 TeV and perspectives for heavy-ion measurements with the ALICE calorimeters

    CERN Document Server

    ,

    2011-01-01

    The inclusive spectrum of \\pi^0 production has been measured in pp collisions at \\sqrt{s} = 900 GeV and 7 TeV with the ALICE experiment. The preliminary results of these measurements are presented, and perspectives for \\pi^0 measurements with heavy ions are discussed.

  5. ALICE & LHCb: refinements for the restart

    CERN Multimedia

    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 ...

  6. Use of FPGA embedded processors for fast cluster reconstruction in the NA62 liquid krypton electromagnetic calorimeter

    International Nuclear Information System (INIS)

    The goal of the NA62 experiment at the CERN SPS is the measurement of the Branching Ratio of the very rare kaon decay K+→π+ ν ν-bar with a 10% accuracy by collecting 100 events in two years of data taking. An efficient photon veto system is needed to reject the K+→π+ π0 background and a liquid krypton electromagnetic calorimeter will be used for this purpose in the 1-10 mrad angular region. The L0 trigger system for the calorimeter consists of a peak reconstruction algorithm implemented on FPGA by using a mixed parallel architecture based on soft core Altera NIOS II embedded processors together with custom VHDL modules. This solution allows an efficient and flexible reconstruction of the energy-deposition peak. The system will be totally composed of 36 TEL62 boards, 108 mezzanine cards and 215 high-performance FPGAs. We describe the design, current status and the results of the first performance tests

  7. A Highly Granular Silicon-Tungsten Electromagnetic Calorimeter and Top Quark Production at the International Linear Collider

    CERN Document Server

    Rouëné, J

    2014-01-01

    This thesis deals with two aspects of the International Linear Collider (ILC) which is a project of a linear electron-positron collider of up to at least 500 GeV center of mass energy. The first aspect is the development of a silicon-tungsten electromagnetic calorimeter (SiW-ECAL) for one of the detectors of the ILC. The concept of this detector is driven by the ILC beam specifications and by the Particle Flow Algorithm (PFA). This requires highly granular calorimeter and very compact one with integrated electronics. To prove the capability of the SiW- ECAL a technological prototype has been built and tested in test beam at DESY. The results are presented here, and show, after the calibration procedure a signal over noise ratio of 10, even in the power pulsing mode. The second aspect is the study of one of the important physics channels of the ILC, the top anti-top quark pairs production. The main goal of this study is to determine the precision that we can expect at the ILC on the top coupling with the W bos...

  8. Re-integration and Consolidation of the Detector Control System for the Compact Muon Solenoid Electromagnetic Calorimeter

    CERN Multimedia

    Holme, Oliver; Dissertori, Günther; Djambazov, Lubomir; Lustermann, Werner; Zelepoukine, Serguei

    2013-01-01

    The current shutdown of the Large Hadron Collider (LHC), following three successful years of physics data-taking, provides an opportunity for major upgrades to be performed on the Detector Control System (DCS) of the Electromagnetic Calorimeter (ECAL) of the Compact Muon Solenoid (CMS) experiment. The upgrades involve changes to both hardware and software, with particular emphasis on taking advantage of more powerful servers and updating third-party software to the latest supported versions. The considerable increase in available processing power enables a reduction from fifteen to three or four servers. To host the control system on fewer machines and to ensure that previously independent software components could run side-by-side without incompatibilities, significant changes in the software and databases were required. Additional work was undertaken to modernise and concentrate I/O interfaces. The challenges to prepare and validate the hardware and software upgrades are described along with details of the ...

  9. Improving the Compact Muon Solenoid Electromagnetic Calorimeter control and safety systems for the Large Hadron Collider Run 2

    CERN Document Server

    Da Silva Di Calafiori, Diogo Raphael; Djambazov, L; Holme, O; Lustermann, W; Adzic, P; Cirkovic, P; Jovanovic, D; Zelepoukine, S

    2015-01-01

    The first long shutdown of the Large Hadron Collider (LS1, 2013-2015) provided an opportunity for significant upgrades of the detector control and safety systems of the CMS Electromagnetic Calorimeter. A thorough evaluation was undertaken, building upon experience acquired during several years of detector operations. Substantial improvements were made to the monitoring systems in order to extend readout ranges and provide improved monitoring precision and data reliability. Additional remotely controlled hardware devices and automatic software routines were implemented to optimize the detector recovery time in the case of failures. The safety system was prepared in order to guarantee full support for both commercial off-the-shelf and custom hardware components throughout the next accelerator running period. The software applications were modified to operate on redundant host servers, to fulfil new requirements of the experiment. User interface extensions were also added to provide a more complete overview of t...

  10. ATLAS electromagnetic calorimeter, construction and test of a large scale system

    CERN Document Server

    Tayalati, Y

    2004-01-01

    The construction of the ATLAS liquid argon presamplers and accordion calorimeters are about to be completed. The first half-length barrel wheel is already installed in the cryostat and assembly of the second wheel is about to be finished. Modules for the first end-cap wheel are ready and the assembly of the first wheel is well under way. From 55000 output channels of the first barrel wheel only four channels are malfunctioning and a very small fraction of high voltage area has showed problems, ~0.15%. After a review of the construction, production, and assembly, results concerning the energy and position resolution are shown.

  11. Identification of positrons and electrons in the cosmic radiation with the electromagnetic calorimeter ECAL for the AMS-02 experiment

    CERN Document Server

    AUTHOR|(CDS)2080883

    2011-07-19

    In May 2011 AMS-02 detector has been successfully installed on the International Space Station (ISS), where it will take data on cosmic radiation from 1 to 1000 GeV for at least 10 years. Among all scientific objectives of the experiment, one of the most important is the search for Dark Matter (DM), which constitutes 80% of the Universe matter, but its nature is still unknown. A DM signal can be identified by studying the combined fluxes of positrons, photons, antiprotons and antideuterium. Thanks to its high acceptance and its performances, AMS-02 detector can extend primary cosmic ray physics search to a new energy range with high accuracy. A key role for these measurements, in particular for the electromagnetic channels, is played by ECAL calorimeter. This subdetector has been developed to measure e− and e+ energy with an accuracy of few %. Thanks to its 3D shower reconstruction imaging capabilities, it also has a high separation power between electromagnetic and hadronic showers (e/p rejection), essent...

  12. Hadrons in a highly granular silicon-tungsten electromagnetic calorimeter - Top quark production at the International Linear Collider

    International Nuclear Information System (INIS)

    The International Linear Collider (ILC) is a proposed e+e- collider with a center-of-mass energy of 500 GeV or more, aimed at precision measurements, e.g. of a light Higgs boson that could be discovered soon at the Large Hadron Collider. Its detectors foresee the use of fine grained calorimeters to achieve the desired accuracy. This thesis presents the study of the response to hadrons of a highly granular silicon-tungsten electromagnetic calorimeter (SiW ECAL), and the study of top quark pair production at the ILC. The SiW ECAL prototype developed by the CALICE collaboration was tested with beams of charged particles at FNAL in May and July 2008. After selecting single negatively charged pions entering the ECAL, its fine granularity is used to introduce a classification among four types of events, used to describe hadronic interactions. Motivated by extra-dimensional models which may explain the AFBb LEP anomaly by modifying the couplings of third generation quarks to the Z boson, the semileptonic decay of the top quark is studied with a full simulation of the proposed ILD detector for the ILC at center-of-mass energy of √(s)=500 GeV and integrated luminosity L=500 fb-1. Detector performances permit to reach efficiencies larger than 70% in finding those events with a purity larger than 95%. This translates into a relative accuracy of about 1% on both the left-right asymmetry of top production ALR0,t and the top forward-backward asymmetry AFBt with electrons polarized at 80% and no polarization of the positrons. The relative uncertainties in the left and right couplings of the top quark to the Z boson could be as good as 0.9% and 1.5%. (author)

  13. Search for Technihadrons in Dielectron channel and alignments of the ATLAS liquid Argon Electromagnetic calorimeters

    International Nuclear Information System (INIS)

    The LHC campaign in the first years of data taking was successful. The 2011 run has allowed to record more than 5 fb-1 of data at √(s) = 7 TeV with the ATLAS experiment. In the work presented in this this thesis the whole 2011 data set is used to performed different studies. This thesis is organized in five chapters. In the first chapter is presented a theoretical introduction to the Standard Model (SM) and to one of its possible extension the TechniColor model (TC). The second chapter gives an overview of the LHC complex and of the ATLAS detector components. In the third chapter the timing analysis on all the readout channels of the Liquid Argon Calorimeter is reported. A precise timing alignment over the whole calorimeter is used to synchronize the detector readout system with the LHC bunch crossing and has also application in some physics analysis such as those looking for long lived particles. In the searches for new phenomena an excellent electron identification capability, with high efficiency and high jet rejection rate, is required over a broad energy range. The fourth chapter of this thesis presents the measurements of the trigger and the identification electron efficiency using Z → ee events. Finally the last chapter describes a search for resonant deviations from the Standard Model in the high masses of the dielectron spectrum within two different Technicolor scenarios the Low-scale Technicolor and the Minimal Walking Technicolor. The significance of potential excess of the TC candidate events over the SM background expectation is evaluated in the dilepton invariant mass distribution. In the absence of any significant signal 95% confidence level limits are set on the cross section and on the resonance mass. (author)

  14. A method for the separation and reconstructions of charged hadron and neutral hadron from their overlapped showers in an electromagnetic calorimeter

    International Nuclear Information System (INIS)

    The separation and reconstructions of charged hadron and neutral hadron from their overlapped showers in an electromagnetic calorimeter is very important for the reconstructions of some particles with hadronic decays, for example the tau reconstruction in the searches for the Standard Model and supersymmetric Higgs bosons at the LHC. In this paper, a method combining the shower cluster in an electromagnetic calorimeter and the parametric formula for hadron showers, was developed to separate the overlapped showers between charged hadron and neutral hadron. Taking the hadronic decay containing one charged pion and one neutral pion in the final status of tau for example, satisfied results of the separation of the overlapped showers, the reconstructions of the energy and positions of the hadrons were obtained. An improved result for the tau reconstruction with this decay model can be also achieved after the application of the proposed method. (authors)

  15. Response of a close to final prototype for the P bar ANDA Electromagnetic Calorimeter to photons at energies below 1 GeV

    Science.gov (United States)

    Rosenbaum, C.; Diehl, S.; Dormenev, V.; Drexler, Peter; Kavatsyuk, M.; Kuske, T.; Nazarenko, S.; Novotny, R. W.; Rosier, P.; Ryazantsev, A.; Wieczorek, P.; Wilms, A.; Wohlfahrt, B.; Zaunick, H.-G.

    2016-07-01

    The response of two generations of prototypes of the P bar ANDA Electromagnetic Calorimeter (EMC), PROTO60 and PROT120, to photons in the energy range between 50 MeV and 800 MeV was obtained. Furthermore, the performance of the pre-amplifier ASIC (APFEL) under real experimental conditions, the position dependence of the energy resolution within the crystal and the implementation of higher order energy correction algorithms with a 15 GeV/c positron beam were studied.

  16. Preparation of the ATLAS experiment in the LHC proton collider, performances of the electromagnetic calorimeter and its potentialities for the top quark

    International Nuclear Information System (INIS)

    ATLAS is the biggest and the more complex detector ever built, it will operate on the LHC and is the outcome of a huge international collaboration of 2000 physicists. This document reviews the theoretical and experimental achievements of one of them, his collaboration spread over 7 years and has followed 2 axis. First, the design, construction and test of the electromagnetic calorimeter of ATLAS and secondly, the development of analysis strategies in the physics of the top quark. The expected important production of top quarks in LHC will allow an accurate measurement of the properties of this particle and in the same way will provide new testing areas for the standard model. The top quark, being extremely massive, might play a significant role in the mechanism of electro-weak symmetry breaking. This document is organized into 5 chapters: 1) ATLAS detector, performance and progress, 2) the optimization of the energy measurement with the electromagnetic calorimeter, 3) the performance of the electromagnetic calorimeter, 4) the physics of the top quark, and 5) the potentialities of ATLAS in the top quark sector. This document presented before an academic board will allow its author to manage research works and particularly to tutor thesis students. (A.C.)

  17. Electrons identification in the forward region of the ATLAS electromagnetic calorimeter at the LHC and first data analysis

    International Nuclear Information System (INIS)

    The start up of the ATLAS experiment at the CERN LHC has been done during the autumn 2009. During the construction and integration of the detector, combined beam tests grouping several subsystems have been carried out. In the forward region of the detector (η > 2.5), a combined beam test with electromagnetic and hadronic calorimeters has been done, whose data (pions and electrons) has been analyzed. Identification of electrons in this region can be used to study decays of Z and W bosons and also to develop some tools to understand the background noises. A method to estimate rejection of pions and electrons identification efficiency is presented using a discriminant analysis based on the methods of Fisher discriminant and on Boosted Decision Trees. It is shown that a pion rejection higher than 200 with an efficiency of electron identification of 50% can be obtained. Moreover the tools and methods developed during the beam tests have been applied on the first data of the LHC with collisions at 7 TeV. Since the present luminosity of the LHC is not yet sufficient to study precisely production of Z and W bosons by using data, a study using the Pythia generator has been done on electrons physics in the forward region. (author)

  18. Role of the CMS electromagnetic calorimeter in the measurement of the Higgs boson properties and search for new physics

    CERN Document Server

    Ferri, Federico

    2014-01-01

    The precise determination of the mass, the width and the couplings of the particle discovered in 2012 around 125 GeV is of capital importance to clarify the nature of such a particle, in particular to establish precisely if it is a Standard Higgs boson. In several new physics scenarios, in fact, a Higgs boson may behave differently with respect to the Standard one, or may not be unique, i.e. there can be more than one Higgs boson. In order to achieve the precision needed to discriminate between different models, the energy resolution, the scale uncertainty and the position resolution for electrons and photons are required to be as good as possible. The CMS scintillating lead-tungstate electromagnetic calorimeter (ECAL) was built as a precise tool with an exceptional energy resolution and a very good position resolution that improved over the years with the knowledge of the detector. Moreover, thanks to the fact that most of the lead-tungstate scintillation light is emitted in about 25 ns, ECAL can be used to ...

  19. Design of a large dynamics fast acquisition device: application to readout of the electromagnetic calorimeter in the ATLAS experiment

    International Nuclear Information System (INIS)

    The construction of the new particle accelerator, the LHC (Large Hadron Collider) at CERN is entails many research and development projects. It is the case in electronics where the problem of the acquisition of large dynamic range signals at high sampling frequencies occurs. Typically, the requirements are a dynamic range of about 65,000 (around 16 bits) at 40 MHz. Some solutions to this problem will be presented. One of them is using a commercial analog-to-digital converter. This case brings up the necessity of a signal conditioning equipment. This thesis describes a way of building such a system that will be called 'multi-gain system'. Then, an application of this method is presented. It involves the realization of an automatic gain switching integrated circuit. It is designed for the readout of the ATLAS electromagnetic calorimeter. The choice and the calculation of the components of this systems are described. They are followed by the results of some measurements done on a prototype made using the AMS 1.2μm BiCMOS foundry. Possible enhancements are also presented. We conclude on the feasibility of such a system and its various applications in a number of fields that are not restricted to particle physics. (author)

  20. Energy calibration and resolution of the CMS electromagnetic calorimeter in pp collisions at $\\sqrt{s}$ = 7 TeV

    CERN Document Server

    Chatrchyan, Serguei; Sirunyan, Albert M; Tumasyan, Armen; Adam, Wolfgang; Bergauer, Thomas; Dragicevic, Marko; Erö, Janos; Fabjan, Christian; Friedl, Markus; Fruehwirth, Rudolf; Ghete, Vasile Mihai; Hörmann, Natascha; Hrubec, Josef; Jeitler, Manfred; Kiesenhofer, Wolfgang; Knünz, Valentin; Krammer, Manfred; Krätschmer, Ilse; Liko, Dietrich; Mikulec, Ivan; Rabady, Dinyar; Rahbaran, Babak; Rohringer, Christine; Rohringer, Herbert; Schöfbeck, Robert; Strauss, Josef; Taurok, Anton; Treberer-Treberspurg, Wolfgang; Waltenberger, Wolfgang; Wulz, Claudia-Elisabeth; Mossolov, Vladimir; Shumeiko, Nikolai; Suarez Gonzalez, Juan; Alderweireldt, Sara; Bansal, Monika; Bansal, Sunil; Cornelis, Tom; De Wolf, Eddi A; Janssen, Xavier; Knutsson, Albert; Luyckx, Sten; Mucibello, Luca; Ochesanu, Silvia; Roland, Benoit; Rougny, Romain; Van Haevermaet, Hans; Van Mechelen, Pierre; Van Remortel, Nick; Van Spilbeeck, Alex; Blekman, Freya; Blyweert, Stijn; D'Hondt, Jorgen; Kalogeropoulos, Alexis; Keaveney, James; Maes, Michael; Olbrechts, Annik; Tavernier, Stefaan; Van Doninck, Walter; Van Mulders, Petra; Van Onsem, Gerrit Patrick; Villella, Ilaria; Clerbaux, Barbara; De Lentdecker, Gilles; Favart, Laurent; Gay, Arnaud; Hreus, Tomas; Léonard, Alexandre; Marage, Pierre Edouard; Mohammadi, Abdollah; Reis, Thomas; Seva, Tomislav; Thomas, Laurent; Vander Velde, Catherine; Vanlaer, Pascal; Wang, Jian; Adler, Volker; Beernaert, Kelly; Benucci, Leonardo; Cimmino, Anna; Costantini, Silvia; Dildick, Sven; Garcia, Guillaume; Klein, Benjamin; Lellouch, Jérémie; Marinov, Andrey; Mccartin, Joseph; Ocampo Rios, Alberto Andres; Ryckbosch, Dirk; Sigamani, Michael; Strobbe, Nadja; Thyssen, Filip; Tytgat, Michael; Walsh, Sinead; Yazgan, Efe; Zaganidis, Nicolas; Basegmez, Suzan; Beluffi, Camille; Bruno, Giacomo; Castello, Roberto; Caudron, Adrien; Ceard, Ludivine; Delaere, Christophe; Du Pree, Tristan; Favart, Denis; Forthomme, Laurent; Giammanco, Andrea; Hollar, Jonathan; Lemaitre, Vincent; Liao, Junhui; Militaru, Otilia; Nuttens, Claude; Pagano, Davide; Pin, Arnaud; Piotrzkowski, Krzysztof; Popov, Andrey; Selvaggi, Michele; Vizan Garcia, Jesus Manuel; Beliy, Nikita; Caebergs, Thierry; Daubie, Evelyne; Hammad, Gregory Habib; Alves, Gilvan; Correa Martins Junior, Marcos; Martins, Thiago; Pol, Maria Elena; Henrique Gomes E Souza, Moacyr; Aldá Júnior, Walter Luiz; Carvalho, Wagner; Chinellato, Jose; Custódio, Analu; Da Costa, Eliza Melo; De Jesus Damiao, Dilson; De Oliveira Martins, Carley; Fonseca De Souza, Sandro; Malbouisson, Helena; Malek, Magdalena; Matos Figueiredo, Diego; Mundim, Luiz; Nogima, Helio; Prado Da Silva, Wanda Lucia; Santoro, Alberto; Soares Jorge, Luana; Sznajder, Andre; Tonelli Manganote, Edmilson José; Vilela Pereira, Antonio; Souza Dos Anjos, Tiago; Bernardes, Cesar Augusto; De Almeida Dias, Flavia; Tomei, Thiago; De Moraes Gregores, Eduardo; Lagana, Caio; Da Cunha Marinho, Franciole; Mercadante, Pedro G; Novaes, Sergio F; Padula, Sandra; Genchev, Vladimir; Iaydjiev, Plamen; Piperov, Stefan; Rodozov, Mircho; Stoykova, Stefka; Sultanov, Georgi; Tcholakov, Vanio; Trayanov, Rumen; Vutova, Mariana; Dimitrov, Anton; Hadjiiska, Roumyana; Kozhuharov, Venelin; Litov, Leander; Pavlov, Borislav; Petkov, Peicho; Bian, Jian-Guo; Chen, Guo-Ming; Chen, He-Sheng; Jiang, Chun-Hua; Liang, Dong; Liang, Song; Meng, Xiangwei; Tao, Junquan; Wang, Jian; Wang, Xianyou; Wang, Zheng; Xiao, Hong; Xu, Ming; Asawatangtrakuldee, Chayanit; Ban, Yong; Guo, Yifei; Li, Qiang; Li, Wenbo; Liu, Shuai; Mao, Yajun; Qian, Si-Jin; Wang, Dayong; Zhang, Linlin; Zou, Wei; Avila, Carlos; Carrillo Montoya, Camilo Andres; Gomez, Juan Pablo; Gomez Moreno, Bernardo; Sanabria, Juan Carlos; Godinovic, Nikola; Lelas, Damir; Plestina, Roko; Polic, Dunja; Puljak, Ivica; Antunovic, Zeljko; Kovac, Marko; Brigljevic, Vuko; Duric, Senka; Kadija, Kreso; Luetic, Jelena; Mekterovic, Darko; Morovic, Srecko; Tikvica, Lucija; Attikis, Alexandros; Mavromanolakis, Georgios; Mousa, Jehad; Nicolaou, Charalambos; Ptochos, Fotios; Razis, Panos A; Finger, Miroslav; Finger Jr, Michael; Assran, Yasser; Ellithi Kamel, Ali; Mahmoud, Mohammed; Mahrous, Ayman; Radi, Amr; Kadastik, Mario; Müntel, Mait; Murumaa, Marion; Raidal, Martti; Rebane, Liis; Tiko, Andres; Eerola, Paula; Fedi, Giacomo; Voutilainen, Mikko; Härkönen, Jaakko; Karimäki, Veikko; Kinnunen, Ritva; Kortelainen, Matti J; Lampén, Tapio; Lassila-Perini, Kati; Lehti, Sami; Lindén, Tomas; Luukka, Panja-Riina; Mäenpää, Teppo; Peltola, Timo; Tuominen, Eija; Tuominiemi, Jorma; Tuovinen, Esa; Wendland, Lauri; Korpela, Arja; Tuuva, Tuure; Besancon, Marc; Choudhury, Somnath; Couderc, Fabrice; Dejardin, Marc; Denegri, Daniel; Fabbro, Bernard; Faure, Jean-Louis; Ferri, Federico; Ganjour, Serguei; Givernaud, Alain; Gras, Philippe; Hamel de Monchenault, Gautier; Jarry, Patrick; Locci, Elizabeth; Malcles, Julie; Millischer, Laurent; Nayak, Aruna; Rander, John; Rosowsky, André; Titov, Maksym; Baffioni, Stephanie; Beaudette, Florian; Benhabib, Lamia; Bianchini, Lorenzo; Bluj, Michal; Busson, Philippe; Charlot, Claude; Daci, Nadir; Dahms, Torsten; Dalchenko, Mykhailo; Dobrzynski, Ludwik; Florent, Alice; Granier de Cassagnac, Raphael; Haguenauer, Maurice; Miné, Philippe; Mironov, Camelia; Naranjo, Ivo Nicolas; Nguyen, Matthew; Ochando, Christophe; Paganini, Pascal; Sabes, David; Salerno, Roberto; Sirois, Yves; Veelken, Christian; Zabi, Alexandre; Agram, Jean-Laurent; Andrea, Jeremy; Bloch, Daniel; Bodin, David; Brom, Jean-Marie; Chabert, Eric Christian; Collard, Caroline; Conte, Eric; Drouhin, Frédéric; Fontaine, Jean-Charles; Gelé, Denis; Goerlach, Ulrich; Goetzmann, Christophe; Juillot, Pierre; Le Bihan, Anne-Catherine; Van Hove, Pierre; Gadrat, Sébastien; Beauceron, Stephanie; Beaupere, Nicolas; Boudoul, Gaelle; Brochet, Sébastien; Chasserat, Julien; Chierici, Roberto; Contardo, Didier; Depasse, Pierre; El Mamouni, Houmani; Fay, Jean; Gascon, Susan; Gouzevitch, Maxime; Ille, Bernard; Kurca, Tibor; Lethuillier, Morgan; Mirabito, Laurent; Perries, Stephane; Sgandurra, Louis; Sordini, Viola; Tschudi, Yohann; Vander Donckt, Muriel; Verdier, Patrice; Viret, Sébastien; Tsamalaidze, Zviad; Autermann, Christian; Beranek, Sarah; Calpas, Betty; Edelhoff, Matthias; Feld, Lutz; Heracleous, Natalie; Hindrichs, Otto; Klein, Katja; Merz, Jennifer; Ostapchuk, Andrey; Perieanu, Adrian; Raupach, Frank; Sammet, Jan; Schael, Stefan; Sprenger, Daniel; Weber, Hendrik; Wittmer, Bruno; Zhukov, Valery; Ata, Metin; Caudron, Julien; Dietz-Laursonn, Erik; Duchardt, Deborah; Erdmann, Martin; Fischer, Robert; Güth, Andreas; Hebbeker, Thomas; Heidemann, Carsten; Hoepfner, Kerstin; Klingebiel, Dennis; Kreuzer, Peter; Merschmeyer, Markus; Meyer, Arnd; Olschewski, Mark; Padeken, Klaas; Papacz, Paul; Pieta, Holger; Reithler, Hans; Schmitz, Stefan Antonius; Sonnenschein, Lars; Steggemann, Jan; Teyssier, Daniel; Thüer, Sebastian; Weber, Martin; Cherepanov, Vladimir; Erdogan, Yusuf; Flügge, Günter; Geenen, Heiko; Geisler, Matthias; Haj Ahmad, Wael; Hoehle, Felix; Kargoll, Bastian; Kress, Thomas; Kuessel, Yvonne; Lingemann, Joschka; Nowack, Andreas; Nugent, Ian Michael; Perchalla, Lars; Pooth, Oliver; Stahl, Achim; Aldaya Martin, Maria; Asin, Ivan; Bartosik, Nazar; Behr, Joerg; Behrenhoff, Wolf; Behrens, Ulf; Bergholz, Matthias; Bethani, Agni; Borras, Kerstin; Burgmeier, Armin; Cakir, Altan; Calligaris, Luigi; Campbell, Alan; Costanza, Francesco; Diez Pardos, Carmen; Dorland, Tyler; Eckerlin, Guenter; Eckstein, Doris; Flucke, Gero; Geiser, Achim; Glushkov, Ivan; Gunnellini, Paolo; Habib, Shiraz; Hauk, Johannes; Hellwig, Gregor; Jung, Hannes; Kasemann, Matthias; Katsas, Panagiotis; Kleinwort, Claus; Kluge, Hannelies; Krämer, Mira; Krücker, Dirk; Kuznetsova, Ekaterina; Lange, Wolfgang; Leonard, Jessica; Lipka, Katerina; Lohmann, Wolfgang; Lutz, Benjamin; Mankel, Rainer; Marfin, Ihar; Melzer-Pellmann, Isabell-Alissandra; Meyer, Andreas Bernhard; Mnich, Joachim; Mussgiller, Andreas; Naumann-Emme, Sebastian; Novgorodova, Olga; Nowak, Friederike; Olzem, Jan; Perrey, Hanno; Petrukhin, Alexey; Pitzl, Daniel; Placakyte, Ringaile; Raspereza, Alexei; Ribeiro Cipriano, Pedro M; Riedl, Caroline; Ron, Elias; Salfeld-Nebgen, Jakob; Schmidt, Ringo; Schoerner-Sadenius, Thomas; Sen, Niladri; Stein, Matthias; Walsh, Roberval; Wissing, Christoph; Blobel, Volker; Enderle, Holger; Erfle, Joachim; Gebbert, Ulla; Görner, Martin; Gosselink, Martijn; Haller, Johannes; Heine, Kristin; Höing, Rebekka Sophie; Kaussen, Gordon; Kirschenmann, Henning; Klanner, Robert; Lange, Jörn; Peiffer, Thomas; Pietsch, Niklas; Rathjens, Denis; Sander, Christian; Schettler, Hannes; Schleper, Peter; Schlieckau, Eike; Schmidt, Alexander; Schröder, Matthias; Schum, Torben; Seidel, Markus; Sibille, Jennifer; Sola, Valentina; Stadie, Hartmut; Steinbrück, Georg; Thomsen, Jan; Vanelderen, Lukas; Barth, Christian; Baus, Colin; Berger, Joram; Böser, Christian; Chwalek, Thorsten; De Boer, Wim; Descroix, Alexis; Dierlamm, Alexander; Feindt, Michael; Guthoff, Moritz; Hackstein, Christoph; Hartmann, Frank; Hauth, Thomas; Heinrich, Michael; Held, Hauke; Hoffmann, Karl-Heinz; Husemann, Ulrich; Katkov, Igor; Komaragiri, Jyothsna Rani; Kornmayer, Andreas; Lobelle Pardo, Patricia; Martschei, Daniel; Mueller, Steffen; Müller, Thomas; Niegel, Martin; Nürnberg, Andreas; Oberst, Oliver; Ott, Jochen; Quast, Gunter; Rabbertz, Klaus; Ratnikov, Fedor; Ratnikova, Natalia; Röcker, Steffen; Schilling, Frank-Peter; Schott, Gregory; Simonis, Hans-Jürgen; Stober, Fred-Markus Helmut; Troendle, Daniel; Ulrich, Ralf; Wagner-Kuhr, Jeannine; Wayand, Stefan; Weiler, Thomas; Zeise, Manuel; Anagnostou, Georgios; Daskalakis, Georgios; Geralis, Theodoros; Kesisoglou, Stilianos; Kyriakis, Aristotelis; Loukas, Demetrios; Markou, Athanasios; Markou, Christos; Ntomari, Eleni; Gouskos, Loukas; Mertzimekis, Theodoros; Panagiotou, Apostolos; Saoulidou, Niki; Stiliaris, Efstathios; Aslanoglou, Xenofon; Evangelou, Ioannis; Flouris, Giannis; Foudas, Costas; Kokkas, Panagiotis; Manthos, Nikolaos; Papadopoulos, Ioannis; Paradas, Evangelos; Bencze, Gyorgy; Hajdu, Csaba; Hidas, Pàl; Horvath, Dezso; Radics, Balint; Sikler, Ferenc; Veszpremi, Viktor; Vesztergombi, Gyorgy; Zsigmond, Anna Julia; Beni, Noemi; Czellar, Sandor; Molnar, Jozsef; Palinkas, Jozsef; Szillasi, Zoltan; Karancsi, János; Raics, Peter; Trocsanyi, Zoltan Laszlo; Ujvari, Balazs; Swain, Sanjay Kumar; Beri, Suman Bala; Bhatnagar, Vipin; Dhingra, Nitish; Gupta, Ruchi; Kaur, Manjit; Mehta, Manuk Zubin; Mittal, Monika; Nishu, Nishu; Saini, Lovedeep Kaur; Sharma, Archana; Singh, Jasbir; Kumar, Ashok; Kumar, Arun; Ahuja, Sudha; Bhardwaj, Ashutosh; Choudhary, Brajesh C; Malhotra, Shivali; Naimuddin, Md; Ranjan, Kirti; Saxena, Pooja; Sharma, Varun; Shivpuri, Ram Krishen; Banerjee, Sunanda; Bhattacharya, Satyaki; Chatterjee, Kalyanmoy; Dutta, Suchandra; Gomber, Bhawna; Jain, Sandhya; Jain, Shilpi; Khurana, Raman; Modak, Atanu; Mukherjee, Swagata; Roy, Debarati; Sarkar, Subir; Sharan, Manoj; Abdulsalam, Abdulla; Dutta, Dipanwita; Kailas, Swaminathan; Kumar, Vineet; Mohanty, Ajit Kumar; Pant, Lalit Mohan; Shukla, Prashant; Topkar, Anita; Aziz, Tariq; Chatterjee, Rajdeep Mohan; Ganguly, Sanmay; Ghosh, Saranya; Guchait, Monoranjan; Gurtu, Atul; Kole, Gouranga; Kumar, Sanjeev; Maity, Manas; Majumder, Gobinda; Mazumdar, Kajari; Mohanty, Gagan Bihari; Parida, Bibhuti; Sudhakar, Katta; Wickramage, Nadeesha; Banerjee, Sudeshna; Dugad, Shashikant; Arfaei, Hessamaddin; Bakhshiansohi, Hamed; Etesami, Seyed Mohsen; Fahim, Ali; Hesari, Hoda; Jafari, Abideh; Khakzad, Mohsen; Mohammadi Najafabadi, Mojtaba; Paktinat Mehdiabadi, Saeid; Safarzadeh, Batool; Zeinali, Maryam; Grunewald, Martin; Abbrescia, Marcello; Barbone, Lucia; Calabria, Cesare; Chhibra, Simranjit Singh; Colaleo, Anna; Creanza, Donato; De Filippis, Nicola; De Palma, Mauro; Fiore, Luigi; Iaselli, Giuseppe; Maggi, Giorgio; Maggi, Marcello; Marangelli, Bartolomeo; My, Salvatore; Nuzzo, Salvatore; Pacifico, Nicola; Pompili, Alexis; Pugliese, Gabriella; Selvaggi, Giovanna; Silvestris, Lucia; Singh, Gurpreet; Venditti, Rosamaria; Verwilligen, Piet; Zito, Giuseppe; Abbiendi, Giovanni; Benvenuti, Alberto; Bonacorsi, Daniele; Braibant-Giacomelli, Sylvie; Brigliadori, Luca; Campanini, Renato; Capiluppi, Paolo; Castro, Andrea; Cavallo, Francesca Romana; Cuffiani, Marco; Dallavalle, Gaetano-Marco; Fabbri, Fabrizio; Fanfani, Alessandra; Fasanella, Daniele; Giacomelli, Paolo; Grandi, Claudio; Guiducci, Luigi; Marcellini, Stefano; Masetti, Gianni; Meneghelli, Marco; Montanari, Alessandro; Navarria, Francesco; Odorici, Fabrizio; Perrotta, Andrea; Primavera, Federica; Rossi, Antonio; Rovelli, Tiziano; Siroli, Gian Piero; Tosi, Nicolò; Travaglini, Riccardo; Albergo, Sebastiano; Chiorboli, Massimiliano; Costa, Salvatore; Potenza, Renato; Tricomi, Alessia; Tuve, Cristina; Barbagli, Giuseppe; Ciulli, Vitaliano; Civinini, Carlo; D'Alessandro, Raffaello; Focardi, Ettore; Frosali, Simone; Gallo, Elisabetta; Gonzi, Sandro; Gori, Valentina; Lenzi, Piergiulio; Meschini, Marco; Paoletti, Simone; Sguazzoni, Giacomo; Tropiano, Antonio; Benussi, Luigi; Bianco, Stefano; Fabbri, Franco; Piccolo, Davide; Fabbricatore, Pasquale; Musenich, Riccardo; Tosi, Silvano; Benaglia, Andrea; De Guio, Federico; Di Matteo, Leonardo; Fiorendi, Sara; Gennai, Simone; Ghezzi, Alessio; Govoni, Pietro; Lucchini, Marco Toliman; Malvezzi, Sandra; Manzoni, Riccardo Andrea; Martelli, Arabella; Massironi, Andrea; Menasce, Dario; Moroni, Luigi; Paganoni, Marco; Pedrini, Daniele; Ragazzi, Stefano; Redaelli, Nicola; Tabarelli de Fatis, Tommaso; Buontempo, Salvatore; Cavallo, Nicola; De Cosa, Annapaola; Fabozzi, Francesco; Iorio, Alberto Orso Maria; Lista, Luca; Meola, Sabino; Merola, Mario; Paolucci, Pierluigi; Azzi, Patrizia; Bacchetta, Nicola; Bisello, Dario; Branca, Antonio; Carlin, Roberto; Checchia, Paolo; Dorigo, Tommaso; Dosselli, Umberto; Fantinel, Sergio; Galanti, Mario; Gasparini, Fabrizio; Gasparini, Ugo; Giubilato, Piero; Gozzelino, Andrea; Kanishchev, Konstantin; Lacaprara, Stefano; Lazzizzera, Ignazio; Margoni, Martino; Maron, Gaetano; Meneguzzo, Anna Teresa; Michelotto, Michele; Passaseo, Marina; Pazzini, Jacopo; Pozzobon, Nicola; Ronchese, Paolo; Simonetto, Franco; Torassa, Ezio; Tosi, Mia; Zotto, Pierluigi; Zumerle, Gianni; Gabusi, Michele; Ratti, Sergio P; Riccardi, Cristina; Vitulo, Paolo; Biasini, Maurizio; Bilei, Gian Mario; Fanò, Livio; Lariccia, Paolo; Mantovani, Giancarlo; Menichelli, Mauro; Nappi, Aniello; Romeo, Francesco; Saha, Anirban; Santocchia, Attilio; Spiezia, Aniello; Androsov, Konstantin; Azzurri, Paolo; Bagliesi, Giuseppe; Boccali, Tommaso; Broccolo, Giuseppe; Castaldi, Rino; D'Agnolo, Raffaele Tito; Dell'Orso, Roberto; Fiori, Francesco; Foà, Lorenzo; Giassi, Alessandro; Kraan, Aafke; Ligabue, Franco; Lomtadze, Teimuraz; Martini, Luca; Messineo, Alberto; Palla, Fabrizio; Rizzi, Andrea; Serban, Alin Titus; Spagnolo, Paolo; Squillacioti, Paola; Tenchini, Roberto; Tonelli, Guido; Venturi, Andrea; Verdini, Piero Giorgio; Vernieri, Caterina; Barone, Luciano; Cavallari, Francesca; Del Re, Daniele; Diemoz, Marcella; Fanelli, Cristiano; Grassi, Marco; Longo, Egidio; Margaroli, Fabrizio; Meridiani, Paolo; Micheli, Francesco; Nourbakhsh, Shervin; Organtini, Giovanni; Paramatti, Riccardo; Rahatlou, Shahram; Soffi, Livia; Amapane, Nicola; Arcidiacono, Roberta; Argiro, Stefano; Arneodo, Michele; Biino, Cristina; Cartiglia, Nicolo; Casasso, Stefano; Costa, Marco; Demaria, Natale; Mariotti, Chiara; Maselli, Silvia; Migliore, Ernesto; Monaco, Vincenzo; Musich, Marco; Obertino, Maria Margherita; Pastrone, Nadia; Pelliccioni, Mario; Potenza, Alberto; Romero, Alessandra; Sacchi, Roberto; Solano, Ada; Staiano, Amedeo; Tamponi, Umberto; Trapani, Pier Paolo; Visca, Lorenzo; Belforte, Stefano; Candelise, Vieri; Casarsa, Massimo; Cossutti, Fabio; Della Ricca, Giuseppe; Gobbo, Benigno; La Licata, Chiara; Marone, Matteo; Montanino, Damiana; Penzo, Aldo; Schizzi, Andrea; Zanetti, Anna; Kim, Tae Yeon; Nam, Soon-Kwon; Chang, Sunghyun; Kim, Dong Hee; Kim, Gui Nyun; Kim, Ji Eun; Kong, Dae Jung; Oh, Young Do; Park, Hyangkyu; Son, Dong-Chul; Kim, Jae Yool; Kim, Zero Jaeho; Song, Sanghyeon; Choi, Suyong; Gyun, Dooyeon; Hong, Byung-Sik; Jo, Mihee; Kim, Hyunchul; Kim, Tae Jeong; Lee, Kyong Sei; Park, Sung Keun; Roh, Youn; Choi, Minkyoo; Kim, Ji Hyun; Park, Chawon; Park, Inkyu; Park, Sangnam; Ryu, Geonmo; Choi, Young-Il; Choi, Young Kyu; Goh, Junghwan; Kim, Min Suk; Kwon, Eunhyang; Lee, Byounghoon; Lee, Jongseok; Lee, Sungeun; Seo, Hyunkwan; Yu, Intae; Grigelionis, Ignas; Juodagalvis, Andrius; Castilla-Valdez, Heriberto; De La Cruz-Burelo, Eduard; Heredia-de La Cruz, Ivan; Lopez-Fernandez, Ricardo; Martínez-Ortega, Jorge; Sánchez Hernández, Alberto; Villasenor-Cendejas, Luis Manuel; Carrillo Moreno, Salvador; Vazquez Valencia, Fabiola; Salazar Ibarguen, Humberto Antonio; Casimiro Linares, Edgar; Morelos Pineda, Antonio; Reyes-Santos, Marco A; Krofcheck, David; Bell, Alan James; Butler, Philip H; Doesburg, Robert; Reucroft, Steve; Silverwood, Hamish; Ahmad, Muhammad; Asghar, Muhammad Irfan; Butt, Jamila; Hoorani, Hafeez R; Khalid, Shoaib; Khan, Wajid Ali; Khurshid, Taimoor; Qazi, Shamona; Shah, Mehar Ali; Shoaib, Muhammad; Bialkowska, Helena; Boimska, Bożena; Frueboes, Tomasz; Górski, Maciej; Kazana, Malgorzata; Nawrocki, Krzysztof; Romanowska-Rybinska, Katarzyna; Szleper, Michal; Wrochna, Grzegorz; Zalewski, Piotr; Brona, Grzegorz; Bunkowski, Karol; Cwiok, Mikolaj; Dominik, Wojciech; Doroba, Krzysztof; Kalinowski, Artur; Konecki, Marcin; Krolikowski, Jan; Misiura, Maciej; Wolszczak, Weronika; Almeida, Nuno; Bargassa, Pedrame; David Tinoco Mendes, Andre; Faccioli, Pietro; Ferreira Parracho, Pedro Guilherme; Gallinaro, Michele; Rodrigues Antunes, Joao; Seixas, Joao; Varela, Joao; Vischia, Pietro; Afanasiev, Serguei; Bunin, Pavel; Gavrilenko, Mikhail; Golutvin, Igor; Gorbunov, Ilya; Kamenev, Alexey; Karjavin, Vladimir; Konoplyanikov, Viktor; Lanev, Alexander; Malakhov, Alexander; Matveev, Viktor; Moisenz, Petr; Palichik, Vladimir; Perelygin, Victor; Shmatov, Sergey; Skatchkov, Nikolai; Smirnov, Vitaly; Zarubin, Anatoli; Evstyukhin, Sergey; Golovtsov, Victor; Ivanov, Yury; Kim, Victor; Levchenko, Petr; Murzin, Victor; Oreshkin, Vadim; Smirnov, Igor; Sulimov, Valentin; Uvarov, Lev; Vavilov, Sergey; Vorobyev, Alexey; Vorobyev, Andrey; Andreev, Yuri; Dermenev, Alexander; Gninenko, Sergei; Golubev, Nikolai; Kirsanov, Mikhail; Krasnikov, Nikolai; Pashenkov, Anatoli; Tlisov, Danila; Toropin, Alexander; Epshteyn, Vladimir; Erofeeva, Maria; Gavrilov, Vladimir; Lychkovskaya, Natalia; Popov, Vladimir; Safronov, Grigory; Semenov, Sergey; Spiridonov, Alexander; Stolin, Viatcheslav; Vlasov, Evgueni; Zhokin, Alexander; Andreev, Vladimir; Azarkin, Maksim; Dremin, Igor; Kirakosyan, Martin; Leonidov, Andrey; Mesyats, Gennady; Rusakov, Sergey V; Vinogradov, Alexey; Belyaev, Andrey; Boos, Edouard; Dubinin, Mikhail; Dudko, Lev; Ershov, Alexander; Gribushin, Andrey; Klyukhin, Vyacheslav; Kodolova, Olga; Lokhtin, Igor; Markina, Anastasia; Obraztsov, Stepan; Petrushanko, Sergey; Savrin, Viktor; Snigirev, Alexander; Azhgirey, Igor; Bayshev, Igor; Bitioukov, Sergei; Kachanov, Vassili; Kalinin, Alexey; Konstantinov, Dmitri; Krychkine, Victor; Petrov, Vladimir; Ryutin, Roman; Sobol, Andrei; Tourtchanovitch, Leonid; Troshin, Sergey; Tyurin, Nikolay; Uzunian, Andrey; Volkov, Alexey; Adzic, Petar; Ekmedzic, Marko; Krpic, Dragomir; Milosevic, Jovan; Aguilar-Benitez, Manuel; Alcaraz Maestre, Juan; Battilana, Carlo; Calvo, Enrique; Cerrada, Marcos; Chamizo Llatas, Maria; Colino, Nicanor; De La Cruz, Begona; Delgado Peris, Antonio; Domínguez Vázquez, Daniel; Fernandez Bedoya, Cristina; Fernández Ramos, Juan Pablo; Ferrando, Antonio; Flix, Jose; Fouz, Maria Cruz; Garcia-Abia, Pablo; Gonzalez Lopez, Oscar; Goy Lopez, Silvia; Hernandez, Jose M; Josa, Maria Isabel; Merino, Gonzalo; Navarro De Martino, Eduardo; Puerta Pelayo, Jesus; Quintario Olmeda, Adrián; Redondo, Ignacio; Romero, Luciano; Santaolalla, Javier; Soares, Mara Senghi; Willmott, Carlos; Albajar, Carmen; de Trocóniz, Jorge F; Brun, Hugues; Cuevas, Javier; Fernandez Menendez, Javier; Folgueras, Santiago; Gonzalez Caballero, Isidro; Lloret Iglesias, Lara; Piedra Gomez, Jonatan; Brochero Cifuentes, Javier Andres; Cabrillo, Iban Jose; Calderon, Alicia; Chuang, Shan-Huei; Duarte Campderros, Jordi; Fernandez, Marcos; Gomez, Gervasio; Gonzalez Sanchez, Javier; Graziano, Alberto; Jorda, Clara; Lopez Virto, Amparo; Marco, Jesus; Marco, Rafael; Martinez Rivero, Celso; Matorras, Francisco; Munoz Sanchez, Francisca Javiela; Rodrigo, Teresa; Rodríguez-Marrero, Ana Yaiza; Ruiz-Jimeno, Alberto; Scodellaro, Luca; Vila, Ivan; Vilar Cortabitarte, Rocio; Abbaneo, Duccio; Auffray, Etiennette; Auzinger, Georg; Bachtis, Michail; Baillon, Paul; Ball, Austin; Barney, David; Bendavid, Joshua; Benitez, Jose F; Bernet, Colin; Bianchi, Giovanni; Bloch, Philippe; Bocci, Andrea; Bonato, Alessio; Bondu, Olivier; Botta, Cristina; Breuker, Horst; Camporesi, Tiziano; Cerminara, Gianluca; Christiansen, Tim; Coarasa Perez, Jose Antonio; Colafranceschi, Stefano; D'Enterria, David; Dabrowski, Anne; De Roeck, Albert; De Visscher, Simon; Di Guida, Salvatore; Dobson, Marc; Dupont-Sagorin, Niels; Elliott-Peisert, Anna; Eugster, Jürg; Funk, Wolfgang; Georgiou, Georgios; Giffels, Manuel; Gigi, Dominique; Gill, Karl; Giordano, Domenico; Girone, Maria; Giunta, Marina; Glege, Frank; Gomez-Reino Garrido, Robert; Gowdy, Stephen; Guida, Roberto; Hammer, Josef; Hansen, Magnus; Harris, Philip; Hartl, Christian; Hegner, Benedikt; Hinzmann, Andreas; Innocente, Vincenzo; Janot, Patrick; Kaadze, Ketino; Karavakis, Edward; Kousouris, Konstantinos; Krajczar, Krisztian; Lecoq, Paul; Lee, Yen-Jie; Lourenco, Carlos; Magini, Nicolo; Malberti, Martina; Malgeri, Luca; Mannelli, Marcello; Masetti, Lorenzo; Meijers, Frans; Mersi, Stefano; Meschi, Emilio; Moser, Roland; Mulders, Martijn; Musella, Pasquale; Nesvold, Erik; Orsini, Luciano; Palencia Cortezon, Enrique; Perez, Emmanuelle; Perrozzi, Luca; Petrilli, Achille; Pfeiffer, Andreas; Pierini, Maurizio; Pimiä, Martti; Piparo, Danilo; Polese, Giovanni; Quertenmont, Loic; Racz, Attila; Reece, William; Rolandi, Gigi; Rovelli, Chiara; Rovere, Marco; Sakulin, Hannes; Santanastasio, Francesco; Schäfer, Christoph; Schwick, Christoph; Segoni, Ilaria; Sekmen, Sezen; Sharma, Archana; Siegrist, Patrice; Silva, Pedro; Simon, Michal; Sphicas, Paraskevas; Spiga, Daniele; Stoye, Markus; Tsirou, Andromachi; Veres, Gabor Istvan; Vlimant, Jean-Roch; Wöhri, Hermine Katharina; Worm, Steven; Zeuner, Wolfram Dietrich; Bertl, Willi; Deiters, Konrad; Erdmann, Wolfram; Gabathuler, Kurt; Horisberger, Roland; Ingram, Quentin; Kaestli, Hans-Christian; König, Stefan; Kotlinski, Danek; Langenegger, Urs; Meier, Frank; Renker, Dieter; Rohe, Tilman; Bachmair, Felix; Bäni, Lukas; Bortignon, Pierluigi; Buchmann, Marco-Andrea; Casal, Bruno; Chanon, Nicolas; Deisher, Amanda; Dissertori, Günther; Dittmar, Michael; Donegà, Mauro; Dünser, Marc; Eller, Philipp; Grab, Christoph; Hits, Dmitry; Lecomte, Pierre; Lustermann, Werner; Marini, Andrea Carlo; Martinez Ruiz del Arbol, Pablo; Mohr, Niklas; Moortgat, Filip; Nägeli, Christoph; Nef, Pascal; Nessi-Tedaldi, Francesca; Pandolfi, Francesco; Pape, Luc; Pauss, Felicitas; Peruzzi, Marco; Ronga, Frederic Jean; Rossini, Marco; Sala, Leonardo; Sanchez, Ann - Karin; Starodumov, Andrei; Stieger, Benjamin; Takahashi, Maiko; Tauscher, Ludwig; Thea, Alessandro; Theofilatos, Konstantinos; Treille, Daniel; Urscheler, Christina; Wallny, Rainer; Weber, Hannsjoerg Artur; Amsler, Claude; Chiochia, Vincenzo; Favaro, Carlotta; Ivova Rikova, Mirena; Kilminster, Benjamin; Millan Mejias, Barbara; Otiougova, Polina; Robmann, Peter; Snoek, Hella; Taroni, Silvia; Tupputi, Salvatore; Verzetti, Mauro; Cardaci, Marco; Chen, Kuan-Hsin; Ferro, Cristina; Kuo, Chia-Ming; Li, Syue-Wei; Lin, Willis; Lu, Yun-Ju; Volpe, Roberta; Yu, Shin-Shan; Bartalini, Paolo; Chang, Paoti; Chang, You-Hao; Chang, Yu-Wei; Chao, Yuan; Chen, Kai-Feng; Dietz, Charles; Grundler, Ulysses; Hou, George Wei-Shu; Hsiung, Yee; Kao, Kai-Yi; Lei, Yeong-Jyi; Lu, Rong-Shyang; Majumder, Devdatta; Petrakou, Eleni; Shi, Xin; Shiu, Jing-Ge; Tzeng, Yeng-Ming; Wang, Minzu; Asavapibhop, Burin; Suwonjandee, Narumon; Adiguzel, Aytul; Bakirci, Mustafa Numan; Cerci, Salim; Dozen, Candan; Dumanoglu, Isa; Eskut, Eda; Girgis, Semiray; Gokbulut, Gul; Gurpinar, Emine; Hos, Ilknur; Kangal, Evrim Ersin; Kayis Topaksu, Aysel; Onengut, Gulsen; Ozdemir, Kadri; Ozturk, Sertac; Polatoz, Ayse; Sogut, Kenan; Sunar Cerci, Deniz; Tali, Bayram; Topakli, Huseyin; Vergili, Mehmet; Akin, Ilina Vasileva; Aliev, Takhmasib; Bilin, Bugra; Bilmis, Selcuk; Deniz, Muhammed; Gamsizkan, Halil; Guler, Ali Murat; Karapinar, Guler; Ocalan, Kadir; Ozpineci, Altug; Serin, Meltem; Sever, Ramazan; Surat, Ugur Emrah; Yalvac, Metin; Zeyrek, Mehmet; Gülmez, Erhan; Isildak, Bora; Kaya, Mithat; Kaya, Ozlem; Ozkorucuklu, Suat; Sonmez, Nasuf; Bahtiyar, Hüseyin; Barlas, Esra; Cankocak, Kerem; Günaydin, Yusuf Oguzhan; Vardarli, Fuat Ilkehan; Yücel, Mete; Levchuk, Leonid; Sorokin, Pavel; Brooke, James John; Clement, Emyr; Cussans, David; Flacher, Henning; Frazier, Robert; Goldstein, Joel; Grimes, Mark; Heath, Greg P; Heath, Helen F; Kreczko, Lukasz; Metson, Simon; Newbold, Dave M; Nirunpong, Kachanon; Poll, Anthony; Senkin, Sergey; Smith, Vincent J; Williams, Thomas; Basso, Lorenzo; Bell, Ken W; Belyaev, Alexander; Brew, Christopher; Brown, Robert M; Cockerill, David JA; Coughlan, John A; Harder, Kristian; Harper, Sam; Jackson, James; Olaiya, Emmanuel; Petyt, David; Radburn-Smith, Benjamin Charles; Shepherd-Themistocleous, Claire; Tomalin, Ian R; Womersley, William John; Bainbridge, Robert; Buchmuller, Oliver; Burton, Darren; Colling, David; Cripps, Nicholas; Cutajar, Michael; Dauncey, Paul; Davies, Gavin; Della Negra, Michel; Ferguson, William; Fulcher, Jonathan; Futyan, David; Gilbert, Andrew; Guneratne Bryer, Arlo; Hall, Geoffrey; Hatherell, Zoe; Hays, Jonathan; Iles, Gregory; Jarvis, Martyn; Karapostoli, Georgia; Kenzie, Matthew; Lane, Rebecca; Lucas, Robyn; Lyons, Louis; Magnan, Anne-Marie; Marrouche, Jad; Mathias, Bryn; Nandi, Robin; Nash, Jordan; Nikitenko, Alexander; Pela, Joao; Pesaresi, Mark; Petridis, Konstantinos; Pioppi, Michele; Raymond, David Mark; Rogerson, Samuel; Rose, Andrew; Seez, Christopher; Sharp, Peter; Sparrow, Alex; Tapper, Alexander; Vazquez Acosta, Monica; Virdee, Tejinder; Wakefield, Stuart; Wardle, Nicholas; Whyntie, Tom; Chadwick, Matthew; Cole, Joanne; Hobson, Peter R; Khan, Akram; Kyberd, Paul; Leggat, Duncan; Leslie, Dawn; Martin, William; Reid, Ivan; Symonds, Philip; Teodorescu, Liliana; Turner, Mark; Dittmann, Jay; Hatakeyama, Kenichi; Kasmi, Azeddine; Liu, Hongxuan; Scarborough, Tara; Charaf, Otman; Cooper, Seth; Henderson, Conor; Rumerio, Paolo; Avetisyan, Aram; Bose, Tulika; Fantasia, Cory; Heister, Arno; Lawson, Philip; Lazic, Dragoslav; Rohlf, James; Sperka, David; St John, Jason; Sulak, Lawrence; Alimena, Juliette; Bhattacharya, Saptaparna; Christopher, Grant; Cutts, David; Demiragli, Zeynep; Ferapontov, Alexey; Garabedian, Alex; Heintz, Ulrich; Kukartsev, Gennadiy; Laird, Edward; Landsberg, Greg; Luk, Michael; Narain, Meenakshi; Segala, Michael; Sinthuprasith, Tutanon; Speer, Thomas; Breedon, Richard; Breto, Guillermo; Calderon De La Barca Sanchez, Manuel; Chauhan, Sushil; Chertok, Maxwell; Conway, John; Conway, Rylan; Cox, Peter Timothy; Erbacher, Robin; Gardner, Michael; Houtz, Rachel; Ko, Winston; Kopecky, Alexandra; Lander, Richard; Mall, Orpheus; Miceli, Tia; Nelson, Randy; Pellett, Dave; Ricci-Tam, Francesca; Rutherford, Britney; Searle, Matthew; Smith, John; Squires, Michael; Tripathi, Mani; Wilbur, Scott; Yohay, Rachel; Andreev, Valeri; Cline, David; Cousins, Robert; Erhan, Samim; Everaerts, Pieter; Farrell, Chris; Felcini, Marta; Hauser, Jay; Ignatenko, Mikhail; Jarvis, Chad; Rakness, Gregory; Schlein, Peter; Takasugi, Eric; Traczyk, Piotr; Valuev, Vyacheslav; Weber, Matthias; Babb, John; Clare, Robert; Dinardo, Mauro Emanuele; Ellison, John Anthony; Gary, J William; Giordano, Ferdinando; Hanson, Gail; Liu, Hongliang; Long, Owen Rosser; Luthra, Arun; Nguyen, Harold; Paramesvaran, Sudarshan; Sturdy, Jared; Sumowidagdo, Suharyo; Wilken, Rachel; Wimpenny, Stephen; Andrews, Warren; Branson, James G; Cerati, Giuseppe Benedetto; Cittolin, Sergio; Evans, David; Holzner, André; Kelley, Ryan; Lebourgeois, Matthew; Letts, James; Macneill, Ian; Mangano, Boris; Padhi, Sanjay; Palmer, Christopher; Petrucciani, Giovanni; Pieri, Marco; Sani, Matteo; Sharma, Vivek; Simon, Sean; Sudano, Elizabeth; Tadel, Matevz; Tu, Yanjun; Vartak, Adish; Wasserbaech, Steven; Würthwein, Frank; Yagil, Avraham; Yoo, Jaehyeok; Barge, Derek; Bellan, Riccardo; Campagnari, Claudio; D'Alfonso, Mariarosaria; Danielson, Thomas; Flowers, Kristen; Geffert, Paul; George, Christopher; Golf, Frank; Incandela, Joe; Justus, Christopher; Kalavase, Puneeth; Kovalskyi, Dmytro; Krutelyov, Vyacheslav; Lowette, Steven; Magaña Villalba, Ricardo; Mccoll, Nickolas; Pavlunin, Viktor; Ribnik, Jacob; Richman, Jeffrey; Rossin, Roberto; Stuart, David; To, Wing; West, Christopher; Apresyan, Artur; Bornheim, Adolf; Bunn, Julian; Chen, Yi; Di Marco, Emanuele; Duarte, Javier; Kcira, Dorian; Ma, Yousi; Mott, Alexander; Newman, Harvey B; Rogan, Christopher; Spiropulu, Maria; Timciuc, Vladlen; Veverka, Jan; Wilkinson, Richard; Xie, Si; Yang, Yong; Zhu, Ren-Yuan; Azzolini, Virginia; Calamba, Aristotle; Carroll, Ryan; Ferguson, Thomas; Iiyama, Yutaro; Jang, Dong Wook; Liu, Yueh-Feng; Paulini, Manfred; Russ, James; Vogel, Helmut; Vorobiev, Igor; Cumalat, John Perry; Drell, Brian Robert; Ford, William T; Gaz, Alessandro; Luiggi Lopez, Eduardo; Nauenberg, Uriel; Smith, James; Stenson, Kevin; Ulmer, Keith; Wagner, Stephen Robert; Alexander, James; Chatterjee, Avishek; Eggert, Nicholas; Gibbons, Lawrence Kent; Hopkins, Walter; Khukhunaishvili, Aleko; Kreis, Benjamin; Mirman, Nathan; Nicolas Kaufman, Gala; Patterson, Juliet Ritchie; Ryd, Anders; Salvati, Emmanuele; Sun, Werner; Teo, Wee Don; Thom, Julia; Thompson, Joshua; Tucker, Jordan; Weng, Yao; Winstrom, Lucas; Wittich, Peter; Winn, Dave; Abdullin, Salavat; Albrow, Michael; Anderson, Jacob; Apollinari, Giorgio; Bauerdick, Lothar AT; Beretvas, Andrew; Berryhill, Jeffrey; Bhat, Pushpalatha C; Burkett, Kevin; Butler, Joel Nathan; Chetluru, Vasundhara; Cheung, Harry; Chlebana, Frank; Cihangir, Selcuk; Elvira, Victor Daniel; Fisk, Ian; Freeman, Jim; Gao, Yanyan; Gottschalk, Erik; Gray, Lindsey; Green, Dan; Gutsche, Oliver; Harris, Robert M; Hirschauer, James; Hooberman, Benjamin; Jindariani, Sergo; Johnson, Marvin; Joshi, Umesh; Klima, Boaz; Kunori, Shuichi; Kwan, Simon; Linacre, Jacob; Lincoln, Don; Lipton, Ron; Lykken, Joseph; Maeshima, Kaori; Marraffino, John Michael; Martinez Outschoorn, Verena Ingrid; Maruyama, Sho; Mason, David; McBride, Patricia; Mishra, Kalanand; Mrenna, Stephen; Musienko, Yuri; Newman-Holmes, Catherine; O'Dell, Vivian; Prokofyev, Oleg; Sexton-Kennedy, Elizabeth; Sharma, Seema; Spalding, William J; Spiegel, Leonard; Taylor, Lucas; Tkaczyk, Slawek; Tran, Nhan Viet; Uplegger, Lorenzo; Vaandering, Eric Wayne; Vidal, Richard; Whitmore, Juliana; Wu, Weimin; Yang, Fan; Yun, Jae Chul; Acosta, Darin; Avery, Paul; Bourilkov, Dimitri; Chen, Mingshui; Cheng, Tongguang; Das, Souvik; De Gruttola, Michele; Di Giovanni, Gian Piero; Dobur, Didar; Drozdetskiy, Alexey; Field, Richard D; Fisher, Matthew; Fu, Yu; Furic, Ivan-Kresimir; Hugon, Justin; Kim, Bockjoo; Konigsberg, Jacobo; Korytov, Andrey; Kropivnitskaya, Anna; Kypreos, Theodore; Low, Jia Fu; Matchev, Konstantin; Milenovic, Predrag; Mitselmakher, Guenakh; Muniz, Lana; Remington, Ronald; Rinkevicius, Aurelijus; Skhirtladze, Nikoloz; Snowball, Matthew; Yelton, John; Zakaria, Mohammed; Gaultney, Vanessa; Hewamanage, Samantha; Lebolo, Luis Miguel; Linn, Stephan; Markowitz, Pete; Martinez, German; Rodriguez, Jorge Luis; Adams, Todd; Askew, Andrew; Bochenek, Joseph; Chen, Jie; Diamond, Brendan; Gleyzer, Sergei V; Haas, Jeff; Hagopian, Sharon; Hagopian, Vasken; Johnson, Kurtis F; Prosper, Harrison; Veeraraghavan, Venkatesh; Weinberg, Marc; Baarmand, Marc M; Dorney, Brian; Hohlmann, Marcus; Kalakhety, Himali; Yumiceva, Francisco; Adams, Mark Raymond; Apanasevich, Leonard; Bazterra, Victor Eduardo; Betts, Russell Richard; Bucinskaite, Inga; Callner, Jeremy; Cavanaugh, Richard; Evdokimov, Olga; Gauthier, Lucie; Gerber, Cecilia Elena; Hofman, David Jonathan; Khalatyan, Samvel; Kurt, Pelin; Lacroix, Florent; Moon, Dong Ho; O'Brien, Christine; Silkworth, Christopher; Strom, Derek; Turner, Paul; Varelas, Nikos; Akgun, Ugur; Albayrak, Elif Asli; Bilki, Burak; Clarida, Warren; Dilsiz, Kamuran; Duru, Firdevs; Griffiths, Scott; Merlo, Jean-Pierre; Mermerkaya, Hamit; Mestvirishvili, Alexi; Moeller, Anthony; Nachtman, Jane; Newsom, Charles Ray; Ogul, Hasan; Onel, Yasar; Ozok, Ferhat; Sen, Sercan; Tan, Ping; Tiras, Emrah; Wetzel, James; Yetkin, Taylan; Yi, Kai; Barnett, Bruce Arnold; Blumenfeld, Barry; Bolognesi, Sara; Fehling, David; Giurgiu, Gavril; Gritsan, Andrei; Hu, Guofan; Maksimovic, Petar; Swartz, Morris; Whitbeck, Andrew; Baringer, Philip; Bean, Alice; Benelli, Gabriele; Kenny III, Raymond Patrick; Murray, Michael; Noonan, Daniel; Sanders, Stephen; Stringer, Robert; Wood, Jeffrey Scott; Barfuss, Anne-Fleur; Chakaberia, Irakli; Ivanov, Andrew; Khalil, Sadia; Makouski, Mikhail; Maravin, Yurii; Shrestha, Shruti; Svintradze, Irakli; Gronberg, Jeffrey; Lange, David; Rebassoo, Finn; Wright, Douglas; Baden, Drew; Calvert, Brian; Eno, Sarah Catherine; Gomez, Jaime; Hadley, Nicholas John; Kellogg, Richard G; Kolberg, Ted; Lu, Ying; Marionneau, Matthieu; Mignerey, Alice; Pedro, Kevin; Peterman, Alison; Skuja, Andris; Temple, Jeffrey; Tonjes, Marguerite; Tonwar, Suresh C; Apyan, Aram; Bauer, Gerry; Busza, Wit; Butz, Erik; Cali, Ivan Amos; Chan, Matthew; Dutta, Valentina; Gomez Ceballos, Guillelmo; Goncharov, Maxim; Kim, Yongsun; Klute, Markus; Lai, Yue Shi; Levin, Andrew; Luckey, Paul David; Ma, Teng; Nahn, Steve; Paus, Christoph; Ralph, Duncan; Roland, Christof; Roland, Gunther; Stephans, George; Stöckli, Fabian; Sumorok, Konstanty; Sung, Kevin; Velicanu, Dragos; Wolf, Roger; Wyslouch, Bolek; Yang, Mingming; Yilmaz, Yetkin; Yoon, Sungho; Zanetti, Marco; Zhukova, Victoria; Dahmes, Bryan; De Benedetti, Abraham; Franzoni, Giovanni; Gude, Alexander; Haupt, Jason; Kao, Shih-Chuan; Klapoetke, Kevin; Kubota, Yuichi; Mans, Jeremy; Pastika, Nathaniel; Rusack, Roger; Sasseville, Michael; Singovsky, Alexander; Tambe, Norbert; Turkewitz, Jared; Cremaldi, Lucien Marcus; Kroeger, Rob; Perera, Lalith; Rahmat, Rahmat; Sanders, David A; Summers, Don; Avdeeva, Ekaterina; Bloom, Kenneth; Bose, Suvadeep; Claes, Daniel R; Dominguez, Aaron; Eads, Michael; Gonzalez Suarez, Rebeca; Keller, Jason; Kravchenko, Ilya; Lazo-Flores, Jose; Malik, Sudhir; Snow, Gregory R; Dolen, James; Godshalk, Andrew; Iashvili, Ia; Jain, Supriya; Kharchilava, Avto; Kumar, Ashish; Rappoccio, Salvatore; Wan, Zongru; Alverson, George; Barberis, Emanuela; Baumgartel, Darin; Chasco, Matthew; Haley, Joseph; Nash, David; Orimoto, Toyoko; Trocino, Daniele; Wood, Darien; Zhang, Jinzhong; Anastassov, Anton; Hahn, Kristan Allan; Kubik, Andrew; Lusito, Letizia; Mucia, Nicholas; Odell, Nathaniel; Pollack, Brian; Pozdnyakov, Andrey; Schmitt, Michael; Stoynev, Stoyan; Velasco, Mayda; Won, Steven; Berry, Douglas; Brinkerhoff, Andrew; Chan, Kwok Ming; Hildreth, Michael; Jessop, Colin; Karmgard, Daniel John; Kolb, Jeff; Lannon, Kevin; Luo, Wuming; Lynch, Sean; Marinelli, Nancy; Morse, David Michael; Pearson, Tessa; Planer, Michael; Ruchti, Randy; Slaunwhite, Jason; Valls, Nil; Wayne, Mitchell; Wolf, Matthias; Antonelli, Louis; Bylsma, Ben; Durkin, Lloyd Stanley; Hill, Christopher; Hughes, Richard; Kotov, Khristian; Ling, Ta-Yung; Puigh, Darren; Rodenburg, Marissa; Smith, Geoffrey; Vuosalo, Carl; Williams, Grayson; Winer, Brian L; Wolfe, Homer; Berry, Edmund; Elmer, Peter; Halyo, Valerie; Hebda, Philip; Hegeman, Jeroen; Hunt, Adam; Jindal, Pratima; Koay, Sue Ann; Lopes Pegna, David; Lujan, Paul; Marlow, Daniel; Medvedeva, Tatiana; Mooney, Michael; Olsen, James; Piroué, Pierre; Quan, Xiaohang; Raval, Amita; Saka, Halil; Stickland, David; Tully, Christopher; Werner, Jeremy Scott; Zenz, Seth Conrad; Zuranski, Andrzej; Brownson, Eric; Lopez, Angel; Mendez, Hector; Ramirez Vargas, Juan Eduardo; Alagoz, Enver; Benedetti, Daniele; Bolla, Gino; Bortoletto, Daniela; De Mattia, Marco; Everett, Adam; Hu, Zhen; Jones, Matthew; Jung, Kurt; Koybasi, Ozhan; Kress, Matthew; Leonardo, Nuno; Maroussov, Vassili; Merkel, Petra; Miller, David Harry; Neumeister, Norbert; Shipsey, Ian; Silvers, David; Svyatkovskiy, Alexey; Vidal Marono, Miguel; Wang, Fuqiang; Xu, Lingshan; Yoo, Hwi Dong; Zablocki, Jakub; Zheng, Yu; Guragain, Samir; Parashar, Neeti; Adair, Antony; Akgun, Bora; Ecklund, Karl Matthew; Geurts, Frank JM; Li, Wei; Padley, Brian Paul; Redjimi, Radia; Roberts, Jay; Zabel, James; Betchart, Burton; Bodek, Arie; Covarelli, Roberto; de Barbaro, Pawel; Demina, Regina; Eshaq, Yossof; Ferbel, Thomas; Garcia-Bellido, Aran; Goldenzweig, Pablo; Han, Jiyeon; Harel, Amnon; Miner, Daniel Carl; Petrillo, Gianluca; Vishnevskiy, Dmitry; Zielinski, Marek; Bhatti, Anwar; Ciesielski, Robert; Demortier, Luc; Goulianos, Konstantin; Lungu, Gheorghe; Malik, Sarah; Mesropian, Christina; Arora, Sanjay; Barker, Anthony; Chou, John Paul; Contreras-Campana, Christian; Contreras-Campana, Emmanuel; Duggan, Daniel; Ferencek, Dinko; Gershtein, Yuri; Gray, Richard; Halkiadakis, Eva; Hidas, Dean; Lath, Amitabh; Panwalkar, Shruti; Park, Michael; Patel, Rishi; Rekovic, Vladimir; Robles, Jorge; Rose, Keith; Salur, Sevil; Schnetzer, Steve; Seitz, Claudia; Somalwar, Sunil; Stone, Robert; Thomas, Scott; Walker, Matthew; Cerizza, Giordano; Hollingsworth, Matthew; Spanier, Stefan; Yang, Zong-Chang; York, Andrew; Bouhali, Othmane; Eusebi, Ricardo; Flanagan, Will; Gilmore, Jason; Kamon, Teruki; Khotilovich, Vadim; Montalvo, Roy; Osipenkov, Ilya; Pakhotin, Yuriy; Perloff, Alexx; Roe, Jeffrey; Safonov, Alexei; Sakuma, Tai; Suarez, Indara; Tatarinov, Aysen; Toback, David; Akchurin, Nural; Damgov, Jordan; Dragoiu, Cosmin; Dudero, Phillip Russell; Jeong, Chiyoung; Kovitanggoon, Kittikul; Lee, Sung Won; Libeiro, Terence; Volobouev, Igor; Appelt, Eric; Delannoy, Andrés G; Greene, Senta; Gurrola, Alfredo; Johns, Willard; Maguire, Charles; Mao, Yaxian; Melo, Andrew; Sharma, Monika; Sheldon, Paul; Snook, Benjamin; Tuo, Shengquan; Velkovska, Julia; Arenton, Michael Wayne; Boutle, Sarah; Cox, Bradley; Francis, Brian; Goodell, Joseph; Hirosky, Robert; Ledovskoy, Alexander; Lin, Chuanzhe; Neu, Christopher; Wood, John; Gollapinni, Sowjanya; Harr, Robert; Karchin, Paul Edmund; Kottachchi Kankanamge Don, Chamath; Lamichhane, Pramod; Sakharov, Alexandre; Anderson, Michael; Belknap, Donald; Borrello, Laura; Carlsmith, Duncan; Cepeda, Maria; Dasu, Sridhara; Friis, Evan; Grogg, Kira Suzanne; Grothe, Monika; Hall-Wilton, Richard; Herndon, Matthew; Hervé, Alain; Klabbers, Pamela; Klukas, Jeffrey; Lanaro, Armando; Lazaridis, Christos; Loveless, Richard; Mohapatra, Ajit; Mozer, Matthias Ulrich; Ojalvo, Isabel; Pierro, Giuseppe Antonio; Ross, Ian; Savin, Alexander; Smith, Wesley H; Swanson, Joshua

    2013-01-01

    The energy calibration and resolution of the electromagnetic calorimeter (ECAL) of the CMS detector have been determined using proton-proton collision data from LHC operation in 2010 and 2011 at a centre-of-mass energy of $\\sqrt{s}$=7 TeV with integrated luminosities of about 5 inverse femtobarns. Crucial aspects of detector operation, such as the environmental stability, alignment, and synchronization, are presented. The in-situ calibration procedures are discussed in detail and include the maintenance of the calibration in the challenging radiation environment inside the CMS detector. The energy resolution for electrons from Z-boson decays is better than 2% in the central region of the ECAL barrel (for pseudorapidity abs(eta) < 0.8) and is 2-5% elsewhere. The derived energy resolution for photons from 125 GeV Higgs boson decays varies across the barrel from 1.1% to 2.6% and from 2.2% to 5% in the entraps. The calibration of the absolute energy is determined from $Z \\to e^+e^-$ decays to a precision of 0....

  1. Photomultipliers on an LHCb calorimeter

    CERN Multimedia

    Maximilien Brice

    2006-01-01

    An engineer attaches photomultiplier tubes to the electromagnetic calorimeter on the LHCb experiment. These large wall detectors will be used to study the bottom quark, a heavy, short-lived version of quarks found in protons and neutrons. The electromagnetic calorimeter will be used to detect photons, electrons and positrons produced by the decay of these short-lived quarks.

  2. Performances of the electromagnetic calorimeter and search for new gauge bosons in the di-electron channel at the LHC

    International Nuclear Information System (INIS)

    The Standard Model of particle physics has known a tremendous rise during the twentieth century. Built up, from the early thirties to the seventies, this theory describing elementary particles and their interactions (electromagnetic, weak, strong) has now been intensively tested by LEP and Tevatron colliders. Besides its success, some problems remain and have lead to new theories attempting to go beyond the standard model. Many of them are predicting the existence of a new gauge boson Z', which is supposed to be observed at the TeV scale. Data recorded by the LHC since autumn 2008 are a new opportunity to check the consistency of the Standard Model and to search for new physics evidence. The work that has been done by the ATLAS collaboration during the last four years has focused on understanding detector's behaviour and analysing the very first collected collisions. This thesis is reflecting these two aspects. Therefore, the first part of this thesis describes the characterisation of a pathology of ATLAS liquid argon calorimeter electronics and of coherent noise bursts that have both been observed since the beginning of ATLAS operation. The policy deployed to preserve data quality is also detailed. The second part is focusing on the search for new Z' gauge boson. In case this particle was to exist, its decay into an electron and a positron would lead to a new massive resonance in the dielectron invariant mass spectrum. Therefore electron reconstruction and identification performances are closely looked at, especially at high transverse momentum. Analysis made on the 4.9 fb-1 of collected data is reported. As no significant excess with respect to Standard Model predictions is observed, the dielectron invariant mass spectrum is interpreted to derive mass limits concerning the existence of new Z' gauge bosons appearing in grand unification theories (E6) and effective sequential standard model (SSM). These limits and those derived by the CMS collaboration are the best

  3. Test of the little Higgs model in Atlas at LHC: simulation of the digitization of the electromagnetic calorimeter

    International Nuclear Information System (INIS)

    LHC is a proton-proton collider with an energy of 14 TeV in the center of mass, which will start operating in 2007 at CERN. Two of its experiments, ATLAS, and CMS, will search and study in particular the Higgs boson, Supersymmetry and other new physics. This thesis was about two aspects of the ATLAS experiment. On one hand the simulation of the liquid Argon electromagnetic calorimeter, with the emulation of the electronic chain in charge of the digitization of the signal and also the evaluation of the electronic noise and the pile-up noise (coming from minimum bias events of inelastic collisions at LHC). These two points have been validated by the analysis of the data taken during beam tests in 2002 and 2004. On the other hand, a physics study concerning the Little Higgs model. This recent model solves the hierarchy problem of the Standard Model, in introducing new heavy particles to cancel quadratic divergences arising in the calculation of the Higgs boson mass. These new particles, with a mass about the TeV/c2, are a heavy quark top, heavy gauge bosons ZH, WH and AH, and a heavy Higgs boson triplet. The physics study dealt with the characteristic decays of the model, ZH in Z + H and WH in W + H, with a Higgs mass either at 120 GeV/c2 decaying in two photons or at 200 GeV/c2 decaying in ZZ or WW. Results show that in both cases, for 300 fb-1 (3 years at high luminosity), an observation of the signal at 5 σ for ZH et WH masses less than 2 TeV/c2 is possible, covering a large part of the parameter space. (author)

  4. Recent photon physics results from the ALICE experiment at the LHC

    CERN Document Server

    Arbor, Nicolas

    2013-01-01

    We present an overview of the photon analysis in pp and Pb-Pb collisions with data taken by the ALICE experiment at the LHC. The ALICE detectors reconstruct photons by using the two electromagnetic calorimeters (photon spectrometer, sampling calorimeter) and central tracking systems for photon converted e + e pairs in the material of the inner ALICE layers. In Pb-Pb collisions the direct photon calculations under- predict the data below 4 GeV / c where it is expected to have a contribution from thermal radiations. The direct photon measurement also shows evidence for a non-zero elliptic flow for 1 < p T < 3 GeV / c. The nuclear modi- fication factor of the 0 production at di erent collision centralities shows a clear pattern of strong suppression in a hot QCD medium with respect to pp collisions. Finally, parton fragmentation following hard collisions is investigated by correlating high momentum direct photons and charged hadrons with the goal of revealing new insights into medium effects in the QGP.

  5. 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...

  6. Study of the photomultiplier R7600-00-M4 for the purpose of the electromagnetic calorimeter in the AMS-02 experiment

    International Nuclear Information System (INIS)

    The properties of the 4-channels photomultiplier R7600-00-M4 from Hamamatsu were extensively studied for use in the AMS-02 electromagnetic calorimeter. A scan of the photocathode with a precision in position better than 0.1 mm was performed in order to measure the position dependence of the sensitivity and of the cross talk between pixels. The influence of the magnetic field applied in X, Y and Z directions was measured. The dynamic range of the photomultiplier was measured and optimized by the appropriate choice of the high voltage divider and of the value of the high voltage. (authors)

  7. Effects of high-energy particle showers on the embedded front-end electronics of an electromagnetic calorimeter for a future lepton collider

    Czech Academy of Sciences Publication Activity Database

    Adloff, C.; Francis, K.; Repond, J.; Marčišovský, Michal; Šícho, Petr; Vrba, Václav; Zálešák, Jaroslav

    2011-01-01

    Roč. 654, č. 1 (2011), s. 97-109. ISSN 0168-9002 R&D Projects: GA MŠk LA09042; GA MŠk LA08032 Grant ostatní: EC(XE) RII3-CT-2006-026126 Institutional research plan: CEZ:AV0Z10100502 Keywords : lepton collider * electromagnetic calorimeter * embedded electronics * fake hits Subject RIV: BF - Elementary Particles and High Energy Physics Impact factor: 1.207, year: 2011 http://arxiv.org/pdf/arXiv:1102.3454v2

  8. The LHCb electromagnetic calorimeter

    CERN Multimedia

    Maximilien Brice

    2005-01-01

    This huge 6X7 square metre wall consists of 3300 blocks containing scintillator, fibre optics and lead, which took engineers on the LHCb experiment at CERN only one month to construct. It will measure the energy of particles produced in proton-proton collisions at the LHC when it is started in 2008. Photons, electrons and positrons will pass through the layers of material in these modules and deposit their energy in the detector through a shower of particles.

  9. ELECTROMAGNETIC CALORIMETER (ECAL)

    CERN Multimedia

    T. Tabarelli

    2012-01-01

      ECAL has been stably running with an up-time efficiency of 99.4% during Run 2012D, with about half of the inefficiency due to a single downtime episode. More than 99% of the collected data are certified good by ECAL for offline analysis. The monitoring system and calibration chain have also been working smoothly, with an excellent stability of the new laser source, after final tuning during the technical stop in September. Some drifts in the response upon monitoring corrections and some degradation in the resolution throughout Run 2012C and 2012D have been observed and will be corrected in the next reprocessing. Calibration constants for the full 2012 dataset –– derived with well-established procedures –– are going to be delivered by the end of the pp run. In parallel to this, studies of the performance evolution have been carried out to predict the longevity of ECAL towards HL-LHC. Radiation damage effects are studied from P5 data, particularly in the end...

  10. ELECTROMAGNETIC CALORIMETER (ECAL)

    CERN Multimedia

    D. Petyt

    2013-01-01

    In a break with tradition, the ECAL general meetings during the April CMS Week were devoted to a series of brainstorming sessions, focusing on a small number of hot-topic items. These included sessions on ECAL upgrades, analysis of 2012 detector performance and resolution, software development plans and a review of the ECAL calibration sequence. These sessions were well attended and extremely productive, and have helped to define and guide the direction of the ECAL effort planned for LS1. The area of ECAL upgrades has been particularly active over the past several months. A note summarising the test-beam performance of crystal matrices, irradiated with proton fluences representative of the end of Phase 1 LHC running, has been prepared and is being reviewed by ECAL. This important note provides data to tune and validate the simulation of ECAL ageing that has been implemented in CMSSW. This simulation is being used by the ECAL group and others to evaluate the physics performance of the ECAL at the end of Pha...

  11. ELECTROMAGNETIC CALORIMETER (ECAL)

    CERN Multimedia

    P. Bloch

    ECAL Barrel The integration of the last Supermodule was completed early July. The insertion of the second half Barrel (EB+) was performed in the second half of July. The Barrel ECAL (36 Supermodules comprising 61200 channels) is now complete, and its cabling campaign has just started. Each Supermodule has been tested after insertion. The number of dead or partially-dead channels amounts to only 28 (0.05% of the total), a performance showing the excellence of the quality control during the whole construction process. The Barrel Off-detector electronics is installed in the CMS Service cavern (with the exception of a few Trigger modules), ready to be connected to the Supermodules after cabling. The ECAL DAQ has been integrated with the CMS DAQ system: at the end of August one supermodule was included in a CMS global run, allowing us to record cosmic muons in both ECAL and DTs. ECAL Endcaps The Endcaps crystal production is proceeding at full speed, and the delivery rate (summing both producers) exceeds ...

  12. ELECTROMAGNETIC CALORIMETER (ECAL)

    CERN Multimedia

    P. Bloch

    ECAL Barrel (EB) The main task during this fall was the connection of services of the ECAL Barrel Supermodules installed in the vacuum-tank. This work has been completed. The team is now commissioning the Supermodules using the final services (cables and optical fibers, HV and LV power supplies, cooling plant) and final electronics in the service cavern. The pace of commissioning has been limited by the availability of the cooling plant. At the time of writing, about 2/3 of the Supermodules had been signed off. ECAL Endcaps (EE) The Endcaps crystal production is proceeding fast. At the end of October, more than 10000 crystals (two thirds of the total quantity) had beem delivered. The Endcaps crystal production will be completed at the end of March 2008, as planned. The crystals testing and the gluing of the VPTs (Vacuum Photo Triodes) on the crystals follow the plan. The assembly of Supercrystals (a set of 25 crystals) is now a routine operation. All the Supercrystals for Dee1 and two thirds of those ne...

  13. ELECTROMAGNETIC CALORIMETER (ECAL)

    CERN Multimedia

    T. Tabarelli and D. Barney

    2011-01-01

    ECAL operations have been rather smooth during the past months, with few hardware problems, stable trigger rates etc. The downtimes attributed to ECAL have, however, increased recently, due to some crashes of the DAQ on the ECAL side. The frequency of problems has increased with luminosity and seems to occur more in the EE than in the EB. There are some indications suggesting these problems may be due to Single Event Upsets – radiation-induced modifications to the front-end electronics. Although this is not yet confirmed, measures are already being taken to reduce the time taken to recover from such problems in order to minimise downtime. No such problems have (yet) been seen in the ES. There has been enormous progress in improving the quality of the corrections required to take into account transparency variations of the ECAL crystals with radiation, through a detailed calibration of the response of the laser diagnostic line. The special LHC runs taken recently – 25-ns operation and h...

  14. ELECTROMAGNETIC CALORIMETER (ECAL)

    CERN Multimedia

    2011-01-01

    All components of ECAL – EB, EE and ES – operated well throughout 2010 with few problems, and negligible evolution of dead channels. About 2% of the ES silicon sensors were unplugged in the second part of the year due to unacceptable increases in leakage currents attributed to radiation damage of the surfaces. The LHC winter technical stop allowed many improvements to the ECAL infrastructure at Point 5. For example, the High Voltage distribution systems for the EE and ES were both improved, with further modifications planned for the ES later in the year. Monitoring and alarming of power supplies was also improved, increasing the level of safety. Some cables in the USC and UXC were re-worked, recovering the operation of some environmental monitoring sensors and improving robustness overall. A thorough Readiness Review Workshop was organised at the end of January 2011 to review 2010 data quality and online and offline operations, and to prepare for the higher luminosities in 2011. All prese...

  15. ELECTROMAGNETIC CALORIMETER (ECAL)

    CERN Multimedia

    T. Tabarelli

    2011-01-01

    All components of ECAL have been running smoothly throughout the 2011 run; the general health of the system is stable since 2010, with close to 99% of the channels available for energy reconstruction. Less than 3% of the registered luminosity to date has bad data quality in ECAL. About 2/3 of the data lost were affected by a low-voltage (LV) failure in one EB super-module due to a flaky contact. After prompt repair, all the remaining contacts were thoroughly checked in the late-March technical stop, with some additional repairs being carried-out. After extensive tests in late 2010 and further optimisation with first 2011 collisions, the rejection at L1 of anomalous signals ascribed to the nuclear counter effect in the APDs is now incorporated in standard running. The required factor-of-3 reduction in the lowest un-prescaled electron/photon trigger (EG12) was met, with larger reduction factors for higher transverse energies, as expected. Studies are ongoing to anticipate the anomalous signal rejection perform...

  16. ELECTROMAGNETIC CALORIMETER (ECAL)

    CERN Multimedia

    P. Bloch

    Crystals and Bare Supermodules The last Barrel crystal was delivered on March 9th and the last (36th) Bare Supermodule was completed by April 20th. Endcaps crystal production is ramping up at both producers and the delivery rate exceeds already 1050 crystals per month. The quality of the Endcaps crystals is similar to that of the Barrel. Electronics The production of the on-detector electronics (Barrel + Endcaps) is complete. Already 10 out of the 12 crates of the Barrel Off-detector modules have been commissioned and installed in the CMS service cavern, and the integration with the global DAQ is progressing fast. The last 2 crates will be completed in August, after reception of the last Trigger Modules TCC68. The installation of the High Voltage is also progressing well, taking into account that some HV supplies are still used in the various assembly and test centres of ECAL. A large fraction of the low voltage supplies has been delivered and tested. Electronics integration As explained in the Febru...

  17. ELECTROMAGNETIC CALORIMETER (ECAL)

    CERN Multimedia

    Philippe Bloch

    ECAL Barrel (EB) As already mentioned in June, the Barrel ECAL is fully commissioned and routinely used during CRUZET runs.  Good progress has been made in the last months to ensure a stable and fully reliable operation, in particular for the Trigger path. More details can be found in the DPG report in this bulletin.     ECAL Endcaps (EE) In the June CMS bulletin, it had been announced that the Dee’s mechanical assembly had been finished end of May. However the electronics integration was still going on for the first Dee. The Summer has seen a spectacular breakthrough of the Endcap project. The electronics integration of Dee1 was completed early July, and this first Dee was transported to point 5 on July 8th. The completion of the three other Dees followed at a pace of one per week. In all cases the quality of the detector as measured in the assembly center was excellent, with all channels active and  the expected noise performance (see for example the reports pr...

  18. ELECTROMAGNETIC CALORIMETER (ECAL)

    CERN Multimedia

    Philippe Bloch

    ECAL Barrel (EB) Great progress has been achieved during the last few months on Barrel commissioning. All 36 supermodules have been run concurrently during the CRUZET in early May. The EB readout has reached the expected performance and is included regularly with central DAQ.  ECAL has been used as a source of triggers during cosmic runs. ECAL Endcaps (EE) Important milestones have been recently achieved: The Endcaps crystal production was completed in mid March. The gluing of the VPTs (Vacuum Photo Triodes) on the crystals, the assembly of Supercrystals (a set of 25 crystals) and their mounting on the Dee backplates (including the connection of the laser monitoring fibers) were finished during May. The mechanical assembly of the four endcap Dees is therefore completed. The assembly of the services and electronics on the backside of the Dees’ back-plates is also proceeding at a fast speed. The laying of the high voltage cables, the inner moderator, the optical fibers for the LED stabilit...

  19. ELECTROMAGNETIC CALORIMETER (ECAL)

    CERN Multimedia

    P. Bloch

    Crystals and Bare Supermodules Thanks to an unprecedented delivery rate, in excess of 1200 crystals per month during the last three months, the last Barrel crystals will be delivered at the end of February. The penultimate bare supermodule is under assembly; the last should be assembled in April. The first batch of Endcap crystals from the mass production has been received from China as well as two pre-series of 100 crystals from Russia. Electronics The assembly and test of off-detector electronics crates (each crate containing three triplets, each triplet comprising Data Concentrator Cards (DCC), Clock & Control System card (CCS) and Trigger & Clock Controllers (TCCs) module – i.e. enough to serve three supermodules) is progressing fast. Several crates have already been installed in the USC at point 5. The production of the specific Endcap electronics is also well advanced. For example, the test of the Front-End cards was recently completed. Electronics integration In early Autu...

  20. ELECTROMAGNETIC CALORIMETER (ECAL)

    CERN Multimedia

    Dave Barney

    2010-01-01

    The operation of ECAL during the whole proton-proton period was very successful, with little down time. During this period we witnessed the first expected signs of radiation damage, both in the preshower detector, where we measured a small but clear increase in the current drawn by the silicon sensors (due to bulk damage) and in the endcap crystals, with the first evidence of a decreasing crystal transparency. The extent of the damage is in general as expected from simulations. However, a small fraction of the preshower sensors also show signs of unexpected surface damage. This is under investigation.
 The running period was very smooth overall but not without glitches. Among these occurrences we had a few high voltage problems in the endcaps, a low voltage connector at the preshower failed, a few unnoticed DCS alarms and our fair share of DAQ "out-of-sync". All problems were followed-up and mitigated where possible. Lessons learnt will be very useful for the long running period ahead of ...

  1. ELECTROMAGNETIC CALORIMETER (ECAL)

    CERN Multimedia

    D. Barney

    2012-01-01

      There are no major concerns for the ECAL running and operation in 2012. The necessary ameliorations to the system were planned in December, and reviewed in a dedicated workshop at the end of January. Many interventions have taken place, mainly on the Trigger and DAQ side in order to bring all software into line with central developments (e.g. SLC5, XDAQ11 and use of SVN). In addition, steps are being taken to improve the recovery time of the system from “single event upsets (SEU)”, which are suspected to be the cause of some downtimes in 2011 (and, if so, would be more frequent in 2012 due to higher luminosities). A new blue laser, for crystal transparency monitoring, is currently being commissioned in Caltech and will be installed at P5 in March. We have optimised the ECAL zero-suppression settings applied online in preparation for the LHC running with high pile-up conditions. The algorithm to reduce the rate of anomalous signals  (“spikes”) fir...

  2. ELECTROMAGNETIC CALORIMETER (ECAL)

    CERN Multimedia

    D. Barney

    2012-01-01

      All necessary improvements to the online system and configuration to cope with the high-pile-up running conditions in 2012 have been commissioned successfully before the start of data-taking and during 2012 RunA. Hardware interventions included a rework of the preshower HV distribution system (increasing the number of working silicon sensor channels by 2%) and the deployment of two new lasers (blue and green) to improve the long-term stability of the monitoring system. The new lasers were deployed before the start of 2012 running and have been steadily producing monitoring constants since April, in parallel with the old laser, which is still used for the default monitoring corrections. Improvements to the DAQ include a firmware upgrade to recover on-the-fly from many types of suspected single-event upsets (SEUs). Configuration changes include new zero-suppression settings applied online and a new tuning for the algorithm to reduce the rate of anomalous signals firing the Level-1 trigger. Moreo...

  3. ELECTROMAGNETIC CALORIMETER (ECAL)

    CERN Multimedia

    D. Barney

    2013-01-01

    The CMS ECAL, comprising barrel (EB), endcaps (EE) and preshower (ES) detectors, operated reliably throughout the 2012 (proton-proton) and early 2013 (proton-lead) running periods. The data quality was excellent, with more than 98% of the delivered luminosity declared good for physics in 2012, and close to 100% in 2013. The number of active channels – ~99% in the EB/EE and ~97% in the ES – was stable during 2012-’13. The ECAL performance, as measured by the electron energy scale and resolution and Z→ee mass resolution in both barrel and endcaps, is excellent and very stable in time (see Figure 1 for an example, and CMS-DP-2013-007: https://cds.cern.ch/record/1528235) following a dedicated calibration using the full 2012 CMS dataset. Figure 1 (a) and (b): The mass resolution of the Z peak, reconstructed from its di-electron decay mode, as a function of time for the barrel (a) and endcaps (b). The sample is inclusive (no cut on the amount of bremsstrahlung undergone...

  4. 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.

  5. Calorimeter insertion

    CERN Multimedia

    2006-01-01

    Calorimeter insertion between toroids in the ATLAS experiment detector Calorimeters are surrounding the inner detector. Calorimeters will absorb and measure the energies of the most charged and neutral particles after the collisions. The saved energy in the calorimeter is detected and converted to signals that are taken out with data taking electronics.

  6. The ALICE silicon strip detector system

    CERN Document Server

    Kuijer, P

    2000-01-01

    ALICE (A Large Ion Collider Experiment) is an experiment at the Large Hadron Collider (LHC) optimized for the study of heavy-ion collisions at a centre-of-mass energy of 5.5 TeV per nucleon. The detector consists essentially of two main components: the central part, composed of detectors mainly devoted to the study of hadronic signals and dielectrons, and the forward muon spectrometer devoted to the study of quarkonia behaviour in dense matter. The central part, which covers +-45 deg. (|eta|<0.9) over the full azimuth, is embedded in a large magnet with a weak solenoidal field. Outside of the Inner Tracking System (ITS), there are a cylindrical TPC and a large area PID array of time-of-flight (TOF) counters. In addition, there are two small-area single-arm detectors: an electromagnetic calorimeter (Photon Spectrometer, PHOS) and an array of RICH counters optimized for high-momentum inclusive particle identification (HMPID). This article describes the silicon strip detector system used in the outer layers o...

  7. 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.

  8. Inclusive jet spectra in p–Pb collisions at ALICE

    Energy Technology Data Exchange (ETDEWEB)

    Connors, Megan

    2014-11-15

    Jet suppression has been observed in central heavy ion collisions. This suppression is attributed to partonic energy loss in the Quark Gluon Plasma (QGP) formed in such collisions. However, this measurement is influenced by all stages of the collision. It is expected that in p–Pb collisions similar initial conditions occur as in Pb–Pb collisions without creating a QGP, allowing modification to the jet spectra due to cold nuclear matter effects to be quantified. Inclusive jet spectra in p–Pb collisions at √(s{sub NN})=5.02 TeV measured by ALICE are presented. Jets are reconstructed via the anti-k{sub T} algorithm with different resolution parameters by combining charged tracks measured in the ALICE tracking system with the neutral energy deposited in the electromagnetic calorimeter. The jet spectra can be used to determine a nuclear modification factor R{sub pPb} while the jet profile in p–Pb is studied by dividing spectra measured with different resolution parameters and comparing to the same ratio measured in pp collisions.

  9. Inclusive jet spectra in p–Pb collisions at ALICE

    International Nuclear Information System (INIS)

    Jet suppression has been observed in central heavy ion collisions. This suppression is attributed to partonic energy loss in the Quark Gluon Plasma (QGP) formed in such collisions. However, this measurement is influenced by all stages of the collision. It is expected that in p–Pb collisions similar initial conditions occur as in Pb–Pb collisions without creating a QGP, allowing modification to the jet spectra due to cold nuclear matter effects to be quantified. Inclusive jet spectra in p–Pb collisions at √(sNN)=5.02 TeV measured by ALICE are presented. Jets are reconstructed via the anti-kT algorithm with different resolution parameters by combining charged tracks measured in the ALICE tracking system with the neutral energy deposited in the electromagnetic calorimeter. The jet spectra can be used to determine a nuclear modification factor RpPb while the jet profile in p–Pb is studied by dividing spectra measured with different resolution parameters and comparing to the same ratio measured in pp collisions

  10. Development of the FoCal-E PAD detector and its electronics for the ALICE experiment at the LHC

    Science.gov (United States)

    Inaba, Motoi; Chujo, Tatsuya; Hirano, Masahiro

    2016-07-01

    In order to study the initial state of high-energy heavy-ion collisions, a forward calorimeter as an upgrade to the ALICE experiment is in the planning stage. The first beam test of the forward electro-magnetic calorimeter (FoCal-E) prototype was carried out in 2014 at the CERN PS and SPS accelerators. With the aim of reading out a signal from the low-granularity silicon pad sensors of FoCal-E, electronic circuits such as a temperature monitor, a trigger-signal converting-circuit, a trigger-signal processor, an independent regulated power circuit and an isolated high-voltage generator were developed. The electric noise problem was solved by means of both the power circuit and the high-voltage generator, and the signal was successfully read out.

  11. Method for a top quark mass measurement with the ATLAS detector at LHC: Study of the ATLAS level-1 electromagnetic calorimeter trigger

    International Nuclear Information System (INIS)

    The ATLAS detector at the LHC (CERN) is designed to study the Standard Model, with the precise measurement of its parameters and the search of the Higgs boson, and the physics beyond the Standard Model with the search of new particles predicted by several theories such as Supersymmetry. The top quark is distinguished in the Standard Model by its mass close to the scale of electroweak symmetry breaking and is therefore a good probe to study physics beyond the Standard Model. A precise measurement of the top quark mass is also required to constrain the mass of the Higgs boson via the radiative corrections to the W boson propagator what would be a test of consistency of the standard Model if the Higgs boson is discovered. The first part of this thesis presents the theoretical aspects of the top quark mass. The second part is devoted to the calibration of the ATLAS level-1 electromagnetic calorimeter trigger, and more specifically to the processing of the analogue signal coming form the calorimeter. The performances of this system with cosmic muons and first LHC collisions are also described. At last, the third part describes the methods for a top quark mass measurement which have been developed in the lepton plus jets and dilepton channels. (author)

  12. Construction of the ATLAS end cap electromagnetic calorimeter and study of its performances; Construction du bouchon du calorimetre electromagnetique d'ATLAS et etudes de ses performances

    Energy Technology Data Exchange (ETDEWEB)

    Barrillon, P

    2002-09-01

    ATLAS is one of the four experiments which will take place at the LHC, the CERN future protons collider. This accelerator, which should start in 2007, will allow to continue the studies carried out by its predecessors, as the standard model Higgs boson and new physics searches. The very high luminosity -10 fb{sup -1} during the first three functioning years, then 100 fb{sup -1}- and the 14 TeV in the frame center will ease these studies. The Centre de Physique des Particules de Marseille took part in the ATLAS collaboration, taking in charge half of the End-cap electromagnetic calorimeter modules construction. The description of this sub-detector and the construction steps, in particular the electrical tests which allow the stacking validation, are presented in this document. These tests results, obtained for the live first production modules, are analysed. The pre-series module (module 0) performances, obtained with beam tests performed at CERN in 1999, are also presented. The detector uniformity studies have allowed to perform important improvements on the calorimeter components. A 0.6% global constant term has been determined in the End-cap internal region (wheel). (author)

  13. Online selection of $\\pi^0 (\\eta)\\rightarrow\\gamma\\gamma$ decays and the Potential for Intercalibrating the CMS Barrel Electromagnetic Calorimeter

    CERN Document Server

    Yang, Yong

    2009-01-01

    Precise in situ calibration of the CMS electromagnetic calorimeter (ECAL) will be of crucial importance to fully exploit the physics reach of the CMS detector. In particular a precise calibration is needed to fully benefit from the excellent energy resolution of the calorimeter, approaching 0.5\\% for high energy unconverted photons. The resolution for photons is particularly important for the discovery of the Higgs boson in the two-photon decay channel. An inter-calibration technique based on low-mass resonance decays, $\\pi^0 (\\eta)\\rightarrow \\gamma \\gamma$, has been developed with simulated events, and was successfully tested with $\\pi^0\\rightarrow \\gamma \\gamma $ decays collected at a CERN test beam. To accommodate the high rate of such decays at the LHC, a dedicated High Level Trigger (HLT) has been developed to select and store the events that can be used by this calibration algorithm. In this paper we describe this online procedure, including the regional unpacking of ECAL data and the selection procedu...

  14. Top quark studies with Atlas at the LHC. Electromagnetic calorimeter commissioning; Etude du quark top avec Atlas au LHC. Mise en route du calorimetre electromagnetique

    Energy Technology Data Exchange (ETDEWEB)

    Resende Vaz de Melo Xavier, B

    2007-05-15

    The first proton-proton collisions in the Large Hadron Collider at CERN will take place on 2007. It aims at understanding the origins of mass. and it will also look for new physics. The ATLAS experiment will exploit all those physics potentialities. using a multilayer generalist detector. Quark top studies will be an important step in ATLAS physics program: its properties may reveal hints of new phenomena. One way to look for new physics is through quark top and W boson polarizations. which are studied here. This detailed simulation study has confirmed previous fast simulation results including extensive systematics estimation. ATLAS should thus yield a precision of a few percents with 10 fb{sup -1} of data. that is a year of LHC working. This precision is sufficient to select among several new physics models. Among ATLAS subsystems, the electromagnetic calorimeter plays a crucial role in the characterisation of electrons and photons. which are used in particular for the Higgs boson search. This document deals with the calorimeter commissioning as the time of the first collisions approaches. The detector itself and its electronics will be described, as well as its installation and calibration. Cosmic muons observation will then be presented. as the first overall test of the reading and reconstruction electronics chain in actual working conditions. (author)

  15. Around ALICE

    CERN Document Server

    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/

  16. Around ALICE

    CERN Document Server

    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

  17. Neutral pion measurement with the ALICE EMCal

    Energy Technology Data Exchange (ETDEWEB)

    Sahlmueller, Baldo [Institut fuer Kernphysik, Goethe-Universitaet Frankfurt (Germany); Collaboration: ALICE-Collaboration

    2014-07-01

    The quark-gluon plasma produced in heavy-ion collisions at the LHC can be studied via transverse momentum distributions of identified hadrons that are produced through different mechanisms in these collisions. The neutral pion offers a complimentary measurement to the measurement of charged hadrons with the ALICE tracking system, since it can be measured in calorimeters such as the ALICE EMCal via its two-photon-decay. The measurement in p-p collisions is a necessary baseline for interpreting the heavy-ion results. Furthermore, the π{sup 0} can be regarded as a standard candle in the calibration of calorimeters in heavy-ion collisions. Hence, understanding the π{sup 0} measurement is an important test for the detector. We present the status and first results of ongoing π{sup 0} analyses in the ALICE p-p data with the EMCal and compare them with complimentary measurements with the ALICE PHOS and the ALICE tracking system. We focus on technical aspects of the analysis.

  18. STATUS OF THE ATLAS LIQUID ARGON CALORIMETER AND ITS PERFORMANCE

    CERN Document Server

    Berillari, T; The ATLAS collaboration

    2011-01-01

    The liquid argon (LAr) calorimeters are used in ATLAS for all electromagnetic and for hadron calorimetry. The LAr calorimeter system consists of an electromagnetic barrel calorimeter and two endcaps with electromagnetic, hadronic and forward calorimeters. The latest status of the detector as well as problems and solutions addressed during the last years will be presented. Aspects of operation of a large detector over a long time period will be summarized and selected topics showing the performance of the detector will be shown.

  19. 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.

  20. 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.

  1. Maximum likelihood method analysis - A procedure to estimate the energy of cosmic rays muons from the observed muon interactions with an electromagnetic calorimeter

    International Nuclear Information System (INIS)

    An electromagnetic sampling calorimeter is under construction in IPNE Bucharest for the determination of the energy of cosmic ray muons in TeV range, consisting of lead (1 cm thick) absorber layer, alternating with scintillator (3 cm thick) layers. The possibility of the estimation of the energy of high-energy cosmic muons is scrutinized using simulations with GEANT code of the response of the detector (30 layers) to incident energies in the range 1-30 TeV. A Maximum Likelihood Method analysis is presented as a procedure to determine the muon energy, being applied to the detector response to the muons of discrete energy and to the muons distributed according to the cosmic ray spectrum. (author) 17 Figs., 2 Tabs., 15 Refs

  2. The Evolution of the Control System for the Electromagnetic Calorimeter of the Compact Muon Solenoid Experiment at the Large Hadron Collider

    CERN Multimedia

    Holme, Oliver; Dissertori, Günther; Lustermann, Werner; Zelepoukine, Serguei

    2011-01-01

    This paper discusses the evolution of the Detector Control System (DCS) designed and implemented for the Electromagnetic Calorimeter (ECAL) of the Compact Muon Solenoid (CMS) experiment at the Large Hadron Collider (LHC) as well as the operational experience acquired during the LHC physics data taking periods of 2010 and 2011. The current implementation in terms of functionality and planned hardware upgrades are presented. Furthermore, a project for reducing the long-term software maintenance, including a year-long detailed analysis of the existing applications, is put forward and the current outcomes which have informed the design decisions for the next CMS ECAL DCS software generation are described. The main goals for the new version are to minimize external dependencies enabling smooth migration to new hardware and software platforms and to maintain the existing functionality whilst substantially reducing support and maintenance effort through homogenization, simplification and standardization of the contr...

  3. 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...

  4. CMS Forward Calorimeters Phase II Upgrade

    CERN Document Server

    Bilki, Burak

    2014-01-01

    The Phase II Upgrade of the CMS forward calorimeters (electromagnetic and hadronic) originates from the fact that these calorimeters will not be sufficiently performant with the expected High Luminosity LHC conditions, planned to be started in 2025. The major challenge is to preserve/improve the high performance of the current forward detectors with new devices that can withstand the unprecedented radiation levels and disentangle the very large event pileup. CMS elected two design concepts to be presented in the Phase II Upgrade Technical Proposal Shashlik electromagnetic calorimeter + Hadronic Endcap Rebuild, and High Granularity Calorimeter. The former concept is based on reconstructing the endcap electromagnetic calorimeter with a shashlik design and replacing the active media of the endcap hadron calorimeter with radiation tolerant active media with a possibility to extend the coverage. The latter concept is concentrating on constructing a high granularity (both longitudinally and laterally) calorimeter ...

  5. The Inner Tracking System of the ALICE Experiment at the CERN LHC

    CERN Document Server

    Riggi, F

    1998-01-01

    The ALICE (A Large Ion Collider Experiment) set-up is the most advanced detection facility for the study of heavy-ion collisions at ultrarelativistic energies, such as those envisaged for the Large Hadron Collider (LHC) at CERN in the near future. Its main goal is the study of the behaviour of matter at high energy densities to search for the transition from the hadronic to the quark-gluon-plasma phase. The ALICE detector is mainly made by a central part, (including the Inner Tracking System, the Time-Projection-Chamber, and a large area particle identification array), which is devoted to the detection of hadronic signals, and a forward part with the muon spectrometer, forward multiplicity detectors and zero-degree calorimeter. Two small areas, single arm detectors (an electromagnetic calorimeter and an array for the identification of high-momentum particles) are also included in the set-up. This contribution is mainly devoted to a report on the present status of development of the Inner Tracking System (ITS)...

  6. The CMS electromagnetic calorimeter and the search for the Higgs boson in the decay channel H → WW* → 2e2ν

    International Nuclear Information System (INIS)

    CMS is one of the four experiments that will take data at the LHC. Large part of my work was devoted to the development of electron reconstruction tools aimed at improving the Higgs boson discovery potential in the H → WW* → 2e2ν channel. A major role in the electron reconstruction is played by the electromagnetic calorimeter ECAL, an homogeneous calorimeter made of scintillating PbWO4 crystals. The first 3 chapters give an overview of LHC and CMS.In chapter 4 the analysis of the data collected during the 2003 electromagnetic calorimeter test beam is presented. First the problem of the intercalibration at the test beam is addressed. This is a major task, since the precision of the intercalibration directly affects the constant term of the energy resolution, for which the CMS goal is to reach a precision better than 0.5%. The good initial intercalibration, anyway, could be spoiled during the data taking by the effects of the radiation on the crystals, which can change the relative responses of the channels. A monitoring laser system is foreseen at CMS. The possibility to check the calibration stability and to correct the changes in the response with a precision within the required limits is demonstrated. Chapter five describes the electron reconstruction and identification in CMS. A crucial problem for the electron reconstruction is represented by the Bremsstrahlung emission in the tracker. A tracking procedure dealing with the Bremsstrahlung energy loss is discussed. Together with an improvement in the reconstruction efficiency, the procedure allows to identify electrons with a small fraction of radiated energy, which can be usefully exploited for the ECAL calibration. The developed algorithms are applied in chapter 6, which presents the study of the CMS discovery potential of the Higgs boson in the H → WW* → 2e2ν channel. This is the discovery channel in the range of masses between 2mW and 2mZ. Here the possibility to extend the study also to the low

  7. MAC calorimeters and applications

    International Nuclear Information System (INIS)

    The MAC detector at PEP features a large solid-angle electromagnetic/hadronic calorimeter system, augmented by magnetic charged-particle tracking, muon analysis and scintillator triggering. Its implementation in the context of electron-positron annihilation physics is described, with emphasis on the utilization of calorimetry

  8. LHCb calorimeter electronics. Photon identification. Calorimeter calibration

    International Nuclear Information System (INIS)

    LHCb is one of the four large experiments installed on the LHC accelerator ring. The aim of the detector is to precisely measure CP violation observables and rare decays in the B meson sector. The calorimeter system of LHCb is made of four sub-systems: the scintillating pad detector, the pre-shower, the electromagnetic (ECAL) and hadronic (HCAL) calorimeters. It is essential to reconstruct B decays, to efficiently trigger on interesting events and to identify electrons and photons. After a review of the LHCb detector sub-systems, the first part of this document describes the calorimeter electronics. First, the front-end electronics in charge of measuring the ECAL and HCAL signals from the photomultipliers is presented, then the following section is an overview of the control card of the four calorimeters. The chapters three and four concern the test software of this electronics and the technological choices making it tolerant to radiations in the LHCb cavern environment. The measurements performed to ensure this tolerance are also given. The second part of this document concerns both the identification of the photons with LHCb and the calibration of the calorimeters. The photon identification method is presented and the performances given. Finally, the absolute energy calibration of the PRS and ECAL, based on the data stored in 2010 is explained. (author)

  9. Intrinsic Transverse Momentum Distribution of Jet Constituents in p-Pb Collisions at ALICE

    CERN Document Server

    Kral, Jiri

    2014-08-01

    The integral part of the URHIC program is also to study the pp and p–A collision in order to understand the “reference” (unmodified) particle production (in pp) and the “cold” nuclear phenomena in p–A. The main focus of this thesis is to study the parton shower evolution in p–Pb collisions in ALICE by analyzing jet fragmentation transverse momentum (j_{T} ). The analysis of j_{T} in p–Pb collisions, for which ALICE has a high quality data set, lays bases for later extension to pp and Pb–Pb data in order to study the induced gluon radiation. Additionally, the yields of \\pi^0 meson were studied in Pb–Pb sqrt(s_{NN}) = 2.76 GeV collision. The \\pi^0 analysis was followed for continuity of work with EMCal detector and as a complement to already progressing \\pi^0 yield analysis in pp. The thesis also focuses on ALICE Electromagnetic Calorimeter (EMCal) and the single-photon Level-0 trigger. Development of the Level-0 trigger system was an important part of this work. From the data analysis poi...

  10. The SDC central calorimeter

    International Nuclear Information System (INIS)

    An overview of the calorimeter being designed and constructed by Solenoidal Detector Collaboration (SDC) for use at the Superconducting SuperCollider is presented. The collaboration have chosen to build a sampling calorimeter using scintillating tile with wavelength-shifter fiber readout as the detector medium, and absorber media of lead and iron for the electromagnetic and hadronic compartments. This choice was based on a substantial amount of R ampersand D and Monte Carlo simulation calculations, which showed that it both met the necessary experimental specifications in addition to being a cost effect design

  11. LS1 Report: ALICE ups the ante

    CERN Document Server

    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...

  12. Test beam results on Atlas electromagnetic end-cap calorimeter: Electrons-jets separation; Resultats des tests en faisceau sur les bouchons du calorimetre electromagnetique d'ATLAS - separation electrons-jets

    Energy Technology Data Exchange (ETDEWEB)

    Serfon, C

    2005-05-15

    ATLAS is one of the four experiments being built on the future proton-proton collider at CERN: the LHC. This experiment has a large physics program, from Standard Model to new physics. The search for the Higgs boson in two photons or in four leptons, or the search of Z' or W' needs a good energy resolution for the electromagnetic calorimeter. This thesis describes the beam tests performed on three modules of the electromagnetic end cap calorimeter. A 0.6% non-uniformity, and a 0.7% energy resolution global constant term (dominant at high energy) has been obtained. Moreover, a study on the separation between electrons and jets is also performed. This study shows that a jets rejection factor of 10{sup 5} can be obtained keeping an electron efficiency better than 78%. (author)

  13. Photodiode read-out of the ALICE photon spectrometer $PbWO_{4}$ crystals

    CERN Document Server

    Man'ko, V I; Sibiryak, Yu; Volkov, M; Klovning, A; Maeland, O A; Odland, O H; Rongved, R; Skaali, B

    1999-01-01

    Proposal of abstract for LEB99, Snowmass, Colorado, 20-24 September 1999The PHOton Spectrometer of the ALICE experiment is an electromagnetic calorimeter of high granularity consisting of 17280 lead-tungstate (PWO) crystals of dimensions 22x22x180 mm3, read out by large-area PIN-diodes with very low-noise front-end electronics. The crystal assembly is operated at -25C to increase the PWO light yield. A 16.1x17.1 mm2 photodiode, optimized for the PWO emissio spectrum at 400-500 nm, has been developed. The 20x20 mm2 preamplifier PCB is attached to the back side of the diode ceramic frame. The charge sensitive preamplifier is built in discrete logic with two input JFETs for optimum matching with the ~150pF PIN-diode. A prototype shaper has been designed and built in discrete logic. For a detector matrix of 64 units the measured ENCs are between 450-550e at -25C. Beam tests demonstrate that the required energy resolution is reached.Summary:The PHOton Spectrometer of the ALICE experiment is an electromagnetic calo...

  14. LHCb calorimeter electronics. Photon identification. Calorimeter calibration

    CERN Document Server

    Machefert, F

    LHCb is one of the four large experiments installed on the LHC accelerator ring. The aim of the detector is to precisely measure CP violation observables and rare decays in the B meson sector. The calorimeter system of LHCb is made of four sub-systems: the scintillating pad detector, the preshower, the electromagnetic (ECAL) and hadronic (HCAL) calorimeters. It is essential to reconstruct B decays, to efficiently trigger on interesting events and to identify electrons and photons. After a review of the LHCb detector sub-systems, the first part of this document describes the calorimeter electronics. First, the front-end electronics in charge of measuring the ECAL and HCAL signals from the photomultipliers is presented, then the following section is an overview of the control card of the four calorimeters. The chapters three and four concern the test software of this electronics and the technological choices making it tolerant to radiations in the LHCb cavern environment. The measurements performed to ensure th...

  15. Studies of isolated photon production in simulated proton-proton collisions with ALICE-EMCal

    International Nuclear Information System (INIS)

    The production of prompt photons at high transverse momentum in proton-proton collisions (p-p) is a useful tool to study perturbative Quantum-Chromo-Dynamics (pQCD). In particular, they yield valuable information about parton distribution functions in the proton. The experimental measurement of prompt γ is a difficult task due to the large background of decay photons from neutral mesons, mainly π0. We present a full simulation and reconstruction study of prompt γ identification in p-p at √s = 14 TeV in the ALICE electromagnetic calorimeter EMCal, giving details on the methods developed to separate them from decay photons with the help of shower-shape and isolation cuts. We present Monte Carlo predictions for signal and background. The method used to extract the final isolated γ corrected cross-section is presented and the calculation of various experimental corrections is outlined.

  16. Proposal for the award of a contract for the supply of 26 000 lead-tungstate scintillation crystals for the CMS electromagnetic calorimeter

    CERN Document Server

    2001-01-01

    This document concerns the award of a contract for the supply of 26 000 lead-tungstate scintillation crystals for the barrel part of the CMS Electromagnetic Calorimeter (ECAL). Following a CERN market survey (MS-2727/EP/CMS) carried out among seven firms in four Member States and two firms in two non-Member States, the Eidgenössische Technische Hochschule in Z rich (ETHZ) published on 15 February 2001 an open call for tenders and, in addition, invited tenders from four firms in two non-Member States, including the two firms identified in the CERN market survey. By the closing date, the ETHZ had received one bid from a firm in a CERN Member State and three bids from three firms in two non-Member States. The Finance Committee is invited to agree to the negotiation of a contract to be placed by CERN, on behalf of the ETHZ, with the lowest bidder, SCIONIX (NL), for the supply of 26 000 lead-tungstate crystals for the barrel part of the CMS ECAL for a total amount of 9 392 000 US dollars (16 060 320 Swiss francs)...

  17. 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.

  18. 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

  19. Study and optimization of the performances of the CMS electromagnetic calorimeter for the physics at LHC; Etude et optimisation des performances du calorimetre electromagnetique de l'experience CMS pour la physique au LHC

    Energy Technology Data Exchange (ETDEWEB)

    Descamps, J

    2007-07-15

    The CMS experiment (Compact Muon Solenoid) is one of the two multi-purpose experiments of the proton-proton collider LHC (Large Hadron Collider). One of the main goals of CMS is the search for the Higgs boson. The collaboration has chosen an electromagnetic calorimeter made of about 75000 scintillating lead tungstate crystals PbWO{sub 4}, at the same time fast, radiation hard, and extremely precise, especially in the energy range for the Higgs boson search, in the channel where it decays in 2 photons. The five first chapters of this thesis present the LHC, the CMS detector and notably the electromagnetic calorimeter (ECAL). The sixth chapter presents a test beam analysis realized in 2004 at CERN with an electron beam of different energies (20-250 GeV) incident on a part (1/36) of the calorimeter barrel called super-module. A study of the energy measurement variation within 9 (3*3) and 25 (5*5) crystals matrices as function of the impact position of the initial electron was done to infer a correction method of the energy measured as function of different parameters. This method has improved very significantly the energy resolution of the calorimeter in the test beam configuration. The last chapter of this thesis presents an application of this correction method for the electrons and photons in the full simulation chain of CMS. The energy reconstruction of photons and electrons is more complicated compared to the test beam case, because of an important amount of matter in front of the calorimeter and of the strong magnetic field in the central part of the CMS detector. The photons have a non negligible probability to convert into an electron-positron pair before the calorimeter, while the electrons (and positrons), whose trajectory is bent in the transverse plan, lose energy in the matter and can emit a random number of Bremsstrahlung photons. A reconstruction algorithm of the electrons and photons energy has been developed to take into account this issue and to

  20. LHCb: Physics with the LHCb calorimeter

    CERN Multimedia

    Barsuk, S

    2007-01-01

    The LHCb calorimeter comprises the scintillator pad detector (SPD), preshower (PS), electromagnetic Shashlyk type (ECAL) and hadronichadronic Tile (HCAL) calorimeters, arranged in pseudo-projective geometry. All the four detectors follow the general principle of reading the light from scintillator tiles with wave length shifting fibers, and transporting the light towards photomultipliers (25 ns R/O).

  1. Atlas barrel electromagnetic calorimeter performance study. Measurement of the Forward-Backward asymmetry in the qq-bar → Z/γ* → e+e- events

    International Nuclear Information System (INIS)

    The start up of the ATLAS experiment at the CERN LHC is planned for the year 2007. The physics program of the experiment covers a wide field, going from tests of Standard Model (Higgs boson discovery) to new theories beyond the Standard Model (Supersymmetry, extra dimensions... etc). The work presented in this thesis has been made within the framework of the preparation of this experiment. After having presented the 2004 combined run, its installation, pedestal data and calibration data analysis, we develop a method for calibrating the energy measurement based on Geant4 Monte-Carlo simulation of the combined run. These simulations are done in the general framework developed for the analysis of the ATLAS data. We present then the performance studies of the electromagnetic calorimeter as well as the results obtained: a sampling term of the energy resolution of 10.6% GeV and local constant term of 0.43%, a non-uniformity of response of 0.44% giving a total constant term of 0.6% and a linearity better than 0.2% for electrons energies between 20 and 250 GeV. Concerning the 'physics' side of this thesis, we show a first study on the determination of the effective weak mixing angle, sin2(Θ(lept,eff) with one precision better than the current results, 10-4. To reach such a precision it has been necessary to identify the electrons in the forward regions of the detector. This point is the subject of the last part of this manuscript, it shows that one can reach an electron-jet rejection of 100 with an efficiency of the electrons reconstruction of 50%, by using a discriminating analysis based on the methods of Fisher, the likelihood and the neural networks. (author)

  2. Neutron emission from electromagnetic dissociation of Pb nuclei at √sNN = 2.76 TeV measured with the ALICE ZDC

    Directory of Open Access Journals (Sweden)

    Cortese P.

    2014-04-01

    The measured cross sections of single and mutual electromagnetic dissociation of Pb nuclei at √sNN = 2.76 TeV, with neutron emission, are σsingle EMD = 187:4 ± 0.2 (stat.−11.2+13.2 (syst. b and σmutual EMD = 5.7 ± 0.1 (stat. ±0.4 (syst. b, respectively [1]. This is the first measurement of electromagnetic dissociation of 208Pb nuclei at the LHC energies, allowing a test of electromagnetic dissociation theory in a new energy regime. The experimental results are compared to the predictions from a relativistic electromagnetic dissociation model.

  3. The ATLAS Liquid Argon Calorimeter Construction, Integration, Commissioning

    CERN Document Server

    Aleksa, Martin

    2006-01-01

    The ATLAS liquid argon (LAr) calorimeter system consists of an electromagnetic barrel calorimeter and two end caps with electromagnetic, hadronic and forward calorimeters. The liquid argon sampling technique, with an accordion geometry was chosen for the barrel electromagnetic calorimeter (EMB) and adapted to the end cap (EMEC). The hadronic end cap calorimeter (HEC) uses a copper-liquid argon sampling technique with flat plate geometry and is subdivided in depth in two wheels per end-cap. Finally, the forward calorimeter (FCAL) is composed of three modules employing cylindrical electrodes with thin liquid argon gaps. The construction of the full calorimeter system is complete since mid-2004. Production modules constructed in the home institutes were integrated into wheels at CERN in 2003-2004, and inserted into the three cryostats. They passed their first complete cold test before the lowering into the ATLAS cavern. Results of quality checks (e.g. electrical, mechanical, ...) performed on all the 190304 read...

  4. ATLAS calorimeters energy calibration for jets

    International Nuclear Information System (INIS)

    The calibration of ATLAS barrel calorimeters (including pre shower system, electromagnetic Liquid Argon calorimeter and scintillating hadron tile calorimeter) was done by standard calibration and weighting technique approaches. The standard calibration gives the bad linearity for hadron non compensated calorimeter. The calibration with weighting technique, in comparison with standard calibration, restores linearity and improves energy resolution up to (σ/E)2 = (38.6%/√E)2 + (1.5%)2 for η 0.6. 6 refs., 4 figs., 1 tab

  5. Participation to the study of the electromagnetic calorimeter calibration for the CMS experiment and to the study of avalanche photodiodes; Participation a l'etude de la calibration du calorimetre electromagnetique de l'experience CMS et a l'etude de photodiodes a avalanche

    Energy Technology Data Exchange (ETDEWEB)

    Da Ponte Puill, V

    1999-12-13

    The electromagnetic calorimeter CMS (Compact Muon Solenoid) has been chosen to study the Higgs boson production. This calorimeter will be constituted of more than 80000 lead tungstate scintillating crystals radiation resistant. Photodiodes have been especially optimized to detect the scintillating light of these crystals: avalanche photodiodes (APD). This thesis includes two separate parts. A first part deals with the APD submitted to high rate of radiations and tested in the Ulysse reactor of the Cea. The second part deals with the calorimeter calibration. (A.L.B.)

  6. ALICE Physics Theoretical Overview

    CERN Document Server

    Alessandro, B; Baier, R; Becattini, F; Botje, M; Carminati, F; Csörgö, T; De Cataldo, G; Foka, P Y; Giovannini, Alberto; Giubellino, P; Guillet, J P; Heinz, Ulrich W; Hencken, K; Iancu, E; Kaidalov, A B; Kajantie, Keijo; Karsch, Frithjof; Koch, V; Kopeliovich, B Z; Kurepin, A B; Laine, Mikko; Lednicky, R; Mangano, Michelangelo L; Monteno, M; Paic, G; Pilon, E; Pshenichnov, I A; Rapp, R; Redlich, Krzysztof; Revol, Jean Pierre Charles; Riggi, F; Safarík, K; Salgado, C A; Schükraft, Jürgen; Sinyukov, Yu M; Tomasik, Boris; Treleani, D; Ugoccioni, R; Venugopalan, R; Vogt, R; Wiedemann, Urs Achim

    2002-01-01

    ALICE is the dedicated heavy-ion experiment at the LHC. This note summarises theoretical developments in the field of hot and dense matter and their relevance for observables accessible to ALICE in nucleus-nucleus, proton-nucleus and proton-proton collisions. In addition, aspects of specific interest for proton-proton, proton-nucleus, ultra-peripheral collisions and cosmic-ray physics, which can be addressed by ALICE, are also discussed.

  7. ALICE - ARC integration

    OpenAIRE

    Anderlik, Csaba; Gregersen, Anders Rhod; Kleist, Josva; Peters, Andreas; Siaz, Pablo

    2007-01-01

    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 infrastructur...

  8. Study of the optical monitoring system of the scintillating crystal involved in the electromagnetic calorimeter of CMS experiment; Etude du systeme de suivi optique des cristaux scintillants du calorimetre electromagnetique de l`experience CMS

    Energy Technology Data Exchange (ETDEWEB)

    Geleoc, M

    1998-09-04

    The prospect of the experimental discovery of the Higgs boson is one of the motivations to build the large hadron collider (LHC). Proton beams will collide and the emitted particles will be detected by ATLAS and CMS equipment. In each detector the electromagnetic calorimeter will allow the characterisation of the 2 photons coming from one of the disintegration channels of the Higgs boson. CMS collaboration has chosen an homogeneous calorimeter fitted with PbWO{sub 4} crystals. Each crystal with its photodetector and its electronic device forms one detection channel. The resolution of the detection channels should not deteriorate all along the operating time. The optical monitoring system of the crystals logs then controls the response of each detection channel in order to allow an accurate calibration of the calorimeter. The optical properties, the resistance to irradiation of PbWO{sub 4} crystals and the modelling of light collection are investigated in this work. The description of the different components of the optical monitoring system highlights the technical difficulties we had to challenge. An experimental testing bench has been set up to study the coupling between the scintillation signal and the signal that feeds the monitoring system, this coupling has been studied under irradiation in the conditions of CMS operating. (A.C.) 94 refs.

  9. Performance of the Electromagnetic Calorimeter of AMS-02 on the International Space Station ans measurement of the positronic fraction in the 1.5 – 350 GeV energy range

    CERN Document Server

    Basara, Laurent

    The AMS-02 experiment is a particle detector installed on the International Space Station (ISS) since May 2011, which measures the characteristics of the cosmic rays to bring answers to the problematics risen by the astroparticle physics since a few decades, in particular the study of dark matter and the search of antimatter. The phenomenological aspects of the physics of cosmic rays are reviewed in a first part. A second one describes the in-flight performances of the different subdetectors of AMS-02, in particular the electromagnetic calorimeter. It is shown, using particles at the ionizing minimum (MIPs), accounting for the main part of cosmic rays, that the calorimeter works as expected, and we find the same performances as on ground. This study is used to follow in time the evolution of the detector performances. It also allows to develop a charge estimator for the nuclei using the calorimeter. A third and final part, deals with the determination of the positronic fraction. The main difficulty of this me...

  10. Characterisation and exploitation of Atlas electromagnetic calorimeter performances: muons study and timing resolution use; Caracterisation et exploitation des performances du calorimetre electromagneique d'Atlas: etude des muons et mise a profit de la resolution en temps

    Energy Technology Data Exchange (ETDEWEB)

    Camard, A

    2004-10-01

    The ATLAS detector in LHC involves electromagnetic calorimeters. The purpose of this work is to study the calorimeter response to the muons contaminating the beam used to test the different modules of ATLAS. We have showed how data analysis from the testing beam can be used to assure that the required performance for the study of the detector response to muons provides a complementary diagnostic tool for electrons. We have taken part into the design of a testing bench aimed at assessing the performance of the receiver circuit for timing and triggering signals. We have developed, in the framework of a quick simulation of ATLAS, a tool for the reconstruction in a simple and fast manner of the localization of the main event vertex by using the measurement of the arrival time of particles with ATLAS's calorimeters. It is likely that this tool will be fully used during the starting phase of the ATLAS experiment because it is easier to operate it quickly and is less sensitive to the background noise than traditional tools based on charged-particle tracks recognition inside the detector.

  11. Calorimeter detectors

    CERN Document Server

    de Barbaro, P; The ATLAS collaboration

    2013-01-01

    Although the instantaneous and integrated luminosity in HL-LHC will be far higher than the LHC detectors were originally designed for, the Barrel calorimeters of the four experiments are expected to continue to perform well  throughout the Phase II program. The conditions for the End-Cap calorimeters are far more challenging and whilst some detectors will require relatively modest changes, others require far more substantial upgrades. We present the results of longevity and performance studies for the calorimeter systems of the four main LHC experiments and outline the upgrade options under consideration. We include a discussion of the R&D required to make the final technology choices for the upgraded detectors.

  12. Calibration of the Atlas electromagnetic calorimeter. Search for the Higgs boson in its invisible decays; Etalonnage du calorimetre electromagnetique d'ATLAS. Recherche du boson de Higgs dans ses desintegrations invisibles

    Energy Technology Data Exchange (ETDEWEB)

    Neukermans, L

    2002-05-01

    The most promising channels for an intermediate mass Higgs boson discovery at LHC are leptonic and photonic decays. Therefore, a good uniformity of response of the electromagnetic calorimeter is required to reach the 0.7% constant term needed. This thesis deals with the absolute calibration of this detector. An electrical description of the calibration system, the detector and its read-out chain has been made for a better comprehension of the signal pulse shapes. A method, using a convolution of the calibration waveforms, has been developed to predict physics response, leading to absolute calibration. The level of accuracy obtained allows to reach the 0.3% contribution to the constant term required. Test beam analysis of a prototype module showed the performance of the electromagnetic calorimeter in terms of local resolution and linearity. A uniformity study has been made, leading to a 0.8% dispersion on a {delta}{eta} x {delta}{phi} = 1.2 x 0.75 area. In a second part, the observability of an invisible Higgs boson produced via weak boson fusion at the LHC is presented. A level 1 trigger strategy for this purely jet and missing E{sub T} final states is discussed. A method to measure the level of background using physics events is presented. This analysis shows that an invisible branching ratio of 25% could be reached at 95% CL with only 30 fb{sup -1} for a Higgs boson mass of 120 GeV/c{sup 2}. (author)

  13. Electromagnetism

    CERN Multimedia

    Without the electromagnetic force, you would not be solid. The atoms of your body are held together by electromagnetism: negatively charged electrons are held around the positively charged nucleus. Atoms share electrons to form molecules, so building up the structure of matter. As its name suggests, electromagnetism has a double nature: a moving electric charge creates a magnetic field. This intimate connection between electricity and magnetism was described by James Maxwell in 1864. The electromagnetic force can be both positive and negative : opposite charges attract, whereas like charges repel. Electromagnetic radiation, such as radio, microwaves, light and X-rays, is emitted by charges when they are made to move. For example, an oscillating current in a wire emits radio waves. Text for the interactive: Why do the needles move when you switch on the current ?

  14. "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

  15. The ALICE Data Challenges

    CERN Document Server

    Baud, J P; Carminati, F; Collignon, M; Collin, F; Divià, R; Durand, J D; Jarp, S; Jouanigot, J M; Panzer, B; Rademakers, F; Saiz, P; Schossmaier, K; Van de Vyvre, P; Vascotto, Alessandro

    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 acquisition 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 mo...

  16. 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.

  17. 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.

  18. 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.

  19. 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.

  20. 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.

  1. 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.

  2. 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.

  3. 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.

  4. Calibration of the electromagnetic calorimeter of the Atlas detector: reconstruction of events with non-pointing photons in the frame of a GMSB supersymmetric model; Etalonnage du calorimetre electromagnetique du detecteur Atlas: reconstruction des evenements avec des photons non pointants das le cadre d'un modele supersymetrique GMSB

    Energy Technology Data Exchange (ETDEWEB)

    Prieur, D

    2005-04-15

    The analysis of test-beam data is focused on the calibration of the ATLAS electromagnetic calorimeter. An electrical model has been developed to predict the shape of the physics pulse out of the calibration signal in order to produce optimal filtering coefficients. They are used to compute energy while minimizing electronic noise and getting rid of any possible time shift. Using these coefficients, the uniformity response is 0.6%, in agreement with the 0.7% global constant term required for the whole calorimeter. The study of non pointing photon is driven by the detection of long lived neutralinos predicted by GMSB SUSY models. A systematic study with a detailed simulation of the ATLAS detector was performed to determine the electromagnetic calorimeter angular resolution for such photons. Results were used to parametrized the detector response and to reconstruct SUSY events from this model. (author)

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

    CERN Document Server

    Morreale, Astrid

    2015-01-01

    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 ($\\pi^{0}$, $\\eta$, $\\omega$) are reconstructed via complementary methods, using the ALICE electromagnetic calorimeters, PHOS and EMCal, and by the c...

  6. 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.

  7. 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.

  8. ALICE honours industries

    CERN Document Server

    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...

  9. The thousandth ALICE member

    CERN Multimedia

    2006-01-01

    From left to right: Lodovico Riccati, Toru Sugitate and Jurgen Schukraft. On Friday 13 October, the ALICE Collaboration Board accepted, as full members, nine new institutes, bringing the number of scientists from 982 to 1015. To celebrate this event, Lodovico Riccati, Chair of the Collaboration Board, and Jurgen Schukraft, Spokesperson of the ALICE Experiment, presented a small award to the thousandth collaborator, Toru Sugitate, from Hiroshima University.

  10. 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.

  11. 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.

  12. The NA48 liquid krypton calorimeter

    CERN Document Server

    Gorini, B

    1997-01-01

    The NA48 collaboration goal is to measure the CP violation parameter Re(ɛl/ɛ) at the level of 2 × 10−4. The neutral Kaon decays will be reconstructed by an electromagnetic liquid Krypton calorimeter with fine granularity and a volume almost totally sensible, to obtain excellent position and energy resolution, as well as time resolution. A description of the detector, results from tests of a prototype and the status of the final calorimeter are reported.

  13. Heavy ion studies with CMS HF calorimeter

    International Nuclear Information System (INIS)

    The capability of the very forward (HF) calorimeter of the CMS detector at LHC to be applied to specific studies with heavy ion beams is discussed. The simulated responses of the HF calorimeter to nucleus-nucleus collisions are used for the analysis of different problems: reconstruction of the total energy flow in the forward rapidity region, accuracy of determination of the impact parameter of collision, study of fluctuations of the hadronic-to-electromagnetic energy ratio, fast inelastic event selection

  14. Experimental study of the test module of the electromagnetic end-cap calorimeter for the ATLAS experiment. Study of the spin correlation in the production of pairs tt-bar

    International Nuclear Information System (INIS)

    LHC, the future CERN proton collider, will start in 2006. It will be devoted to a better understanding of the Standard Model and new physics research. With a 10 ∫b-1 per year at low luminosity during the first three years, then 100 ∫b-1 per year, and energy of 14 TeV in the center of mass, the LHC is designed to discover the Standard or SUSY Higgs boson, or probe signature of new physics. ATLAS, one of the four experiments at the LHC, can study a large physics range, as Higgs boson, top and bottom, gauge bosons and new particles expected by SUSY model or other models beyond the Standard Model. The CPPM laboratory is responsible of a part of the electromagnetic end-cap calorimeter for the ATLAS experiment. In 1999, an ATLAS-like prototype of module was stacked in Marseille and intensively tested at CERN. Description of the calorimeter and a part of test-beam results are presented in this PhD manuscript. In parallel, a study about potentiality of the tt-bar spin correlation measurement was done. The high tt-bar statistic produced at the LHC allows to explore the quark top properties in details and being sensitive to new physics phenomena. Signatures of such physics can be extracted from tt-bar decay product angular distributions which are sensitive to tt-bar spin correlation. (authors)

  15. Maintaining an effective and efficient control system for the Electromagnetic Calorimeter of the Compact Muon Solenoid experiment during Long-Term Operations of CERN�??s Large Hadron Collider

    CERN Document Server

    Holme, Oliver

    2012-01-01

    The sub-detectors of the Compact Muon Solenoid (CMS) multi-purpose particle detector at the CERN Large Hadron Collider (LHC) have been collecting physics data from particle collisions for almost three years. During this period, the CMS Electromagnetic Calorimeter (ECAL) Detector Control System (DCS) has contributed to the high level of availability of the experiment. This paper presents the current architecture of this distributed and heterogeneous control system alongside plans and developments for future improvements. To ensure that the system can efficiently operate and adapt to changes throughout the required operation lifetime of more than a decade, the potential legacy aspects of this kind of control system must be carefully managed. Such issues include evolving system requirements, turnover of staff members, potential benefits from new technologies and the need to follow release schedules of external software dependencies. The techniques and results of the work to continually maintain, improve and stre...

  16. Results from ATLAS Calorimeter Combined Test Beam

    CERN Document Server

    Tarrade, F

    2007-01-01

    Beam tests of combinations of ATLAS calorimeters have been performed both for the barrel and end cap parts. During a combined test beam in summer 2004 a slice of the ATLAS barrel detector - including all detector sub systems from the inner tracker, the calorimetry to the muon system - was exposed to particle beams (electrons, pions, photons, muons) with different energies (1GeV to 350GeV). The aim was to study the combined performance of the different detector sub systems in ATLAS-like conditions. We will present the electronics calibration scheme of the electromagnetic calorimeter and its implementation. The following studies on the combined testbeam data have been performed and will be presented: performance of the electromagnetic calorimetry down to very low energies (> GeV), photon reconstruction including converted photons and position measurements using the very precise ATLAS tracker and the electromagnetic calorimeter. These measurements have been compared to Monte Carlo simulations showing the good de...

  17. Optimisation of CO2 laser welding of thin sheets made of stainless steel 304 L. Fabrication of prototype detection modules for a large size electromagnetic calorimeter

    International Nuclear Information System (INIS)

    For the new calorimeter detector, to be used in UA1 experiment at CERN proton-antiproton collider, about 35'000 stainless steel boxes with a volume of the order of 500 x 400 x 3 mm3, containing immerged electrodes in Tetramethylpentane (TMP) are required. The first hundred prototype boxes were built at CERN using CO2 laser welding technique. The results of a systematic experimental investigation and optimization of the welding parameters for 0.1 mm thick 304 L stainless steel sheets are presented

  18. An electromagnetic calorimeter for use in a strong magnetic field at LEP based on CEREN 25 lead glass and vacuum photo-triodes

    International Nuclear Information System (INIS)

    The end-caps of the lead glass calorimeter being built for the OPAL experiment at LEP will be required to operate in axial magnetic fields up to 1 Tesla. The technique adopted uses CEREN 251 glass instrumented with vacuum photo-triodes (single stage photomultipliers). We report results from tests on single modules in electron beams while subject to strong magnetic fields, which prove the viability of this design. The method results in excellent linearity, resolution and stability. The best energy resolution so far achieved is 5.3%/E at zero field with a degradation of less than 1.0%/E for magnetic fields up to 1 Tesla

  19. ATLAS-Hadronic Calorimeter

    CERN Multimedia

    2003-01-01

    Hall 180 work on Hadronic Calorimeter The ATLAS hadronic tile calorimeter The Tile Calorimeter, which constitutes the central section of the ATLAS hadronic calorimeter, is a non-compensating sampling device made of iron and scintillating tiles. (IEEE Trans. Nucl. Sci. 53 (2006) 1275-81)

  20. Electromagnetism

    CERN Document Server

    Grant, Ian S

    1990-01-01

    The Manchester Physics Series General Editors: D. J. Sandiford; F. Mandl; A. C. Phillips Department of Physics and Astronomy, University of Manchester Properties of Matter B. H. Flowers and E. Mendoza Optics Second Edition F. G. Smith and J. H. Thomson Statistical Physics Second Edition F. Mandl Electromagnetism Second Edition I. S. Grant and W. R. Phillips Statistics R. J. Barlow Solid State Physics Second Edition J. R. Hook and H. E. Hall Quantum Mechanics F. Mandl Particle Physics Second Edition B. R. Martin and G. Shaw the Physics of Stars Second Edition A. C. Phillips Computing for Scient

  1. The ATLAS Liquid Argon Calorimeter: Construction, Integration, Commissioning

    International Nuclear Information System (INIS)

    The ATLAS liquid argon (LAr) calorimeter system consists of an electromagnetic barrel calorimeter and two end caps with electromagnetic, hadronic and forward calorimeters. The liquid argon sampling technique, with an accordion geometry was chosen for the barrel electromagnetic calorimeter (EMB) and adapted to the end cap (EMEC). The hadronic end cap calorimeter (HEC) uses a copper-liquid argon sampling technique with flat plate geometry and is subdivided in depth in two wheels per end-cap. Finally, the forward calorimeter (FCAL) is composed of three modules employing cylindrical electrodes with thin liquid argon gaps.The construction of the full calorimeter system is complete since mid-2004. Production modules constructed in the home institutes were integrated into wheels at CERN in 2003-2004, and inserted into the three cryostats. They passed their first complete cold test before the lowering into the ATLAS cavern. Results of quality checks (e.g. electrical, mechanical, ...) performed on all the 190304 read-out channels after cool down will be reported. End 2004 the ATLAS barrel electromagnetic (EM) calorimeter was installed in the ATLAS cavern and since summer 2005 the front-end electronics are being connected and tested. Results of this first commissioning phase will be shown to demonstrate the high standards of quality control for our detectors

  2. Qualification procedure of the electromagnetic calorimeter of the ATLAS detector; Conception et mise au point de la procedure de qualification du calorimetre electromagnetique a argon liquide du detecteur ATLAS

    Energy Technology Data Exchange (ETDEWEB)

    Massol, N

    2000-04-19

    LHC is the next collider based at CERN in Europe. The purpose of this machine is the Higgs boson and SUSY particles search. The detectors must have an excellent electromagnetic calorimetry to measure electron and photon energy. To maximize the signal to noise ratio for a low mass Higgs, it is fundamental to obtain a constant term as small as possible. LAPP is participating in the construction of the liquid argon electromagnetic calorimeter of the ATLAS collaboration. This technology is well adapted to the LHC experimental conditions. A systematic procedure to qualify the modules of this detector is an essential step to guarantee a 0,7% constant term, which is the collaboration objective. The procedure detailed in this thesis consists of quality monitoring during mechanical assembly and of a set of electrical tests such as electrical continuity, cell and cross-talk capacitance measurement, and high-voltage behaviour. For the whole test, it has been necessary to develop dedicated electronic cards, to develop measurement methods, and the whole operation software. Making the procedure automatic will guarantee the quality of each module during assembly, cabling, and test in liquid argon. (author)

  3. MAD - Monitoring ALICE Dataflow

    Science.gov (United States)

    Chibante Barroso, V.; Costa, F.; Grigoras, C.; Wegrzynek, A.

    2015-12-01

    ALICE (A Large Ion Collider Experiment) 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). Following a successful Run 1, which ended in February 2013, the ALICE data acquisition (DAQ) entered a consolidation phase to prepare for Run 2 which will start in the beginning of 2015. A new software tool has been developed by the data acquisition project to improve the monitoring of the experiment's dataflow, from the data readout in the DAQ farm up to its shipment to CERN's main computer centre. This software, called ALICE MAD (Monitoring ALICE Dataflow), uses the MonALISA framework as core module to gather, process, aggregate and distribute monitoring values from the different processes running in the distributed DAQ farm. Data are not only pulled from the data sources to MAD but can also be pushed by dedicated data collectors or the data source processes. A large set of monitored metrics (from the backpressure status on the readout links to event counters in each of the DAQ nodes and aggregated data rates for the whole data acquisition) is needed to provide a comprehensive view of the DAQ status. MAD also injects alarms in the Orthos alarm system whenever abnormal conditions are detected. The MAD web-based GUI uses WebSockets to provide dynamic and on-time status displays for the ALICE shift crew. Designed as a widget-based system, MAD supports an easy integration of new visualization blocks and also customization of the information displayed to the shift crew based on the ALICE activities.

  4. 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.

  5. 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

  6. The ALICE Pixel Detector

    International Nuclear Information System (INIS)

    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

  7. Measurement of the cross section for electromagnetic dissociation with neutron emission in Pb-Pb collisions at √SNN=2.76 TeV

    International Nuclear Information System (INIS)

    The first measurement of neutron emission in electromagnetic dissociation of 208Pb nuclei at the LHC is presented. The measurement is performed using the neutron zero degree calorimeters of the ALICE experiment, which detect neutral particles close to beam rapidity. The measured cross sections of single and mutual electromagnetic dissociation of Pb nuclei at √SNN = 2.76 TeV with neutron emission are σsingleEMD =187.4 ± 0.2(stat)+13.2-11.2(syst) b and σmutualEMD = 5.7±0.1(stat) ± 0.4(syst) b, respectively. The experimental results are compared to the predictions from a relativistic electromagnetic dissociation model. (authors)

  8. Measurement of the cross section for electromagnetic dissociation with neutron emission in Pb-Pb collisions at sqrt[s(NN)] = 2.76 TeV.

    Science.gov (United States)

    Abelev, B; Adam, J; Adamová, D; Adare, A M; Aggarwal, M M; Aglieri Rinella, G; Agocs, A G; Agostinelli, A; Aguilar Salazar, S; Ahammed, Z; Ahmad Masoodi, A; Ahmad, N; Ahn, S U; Akindinov, A; Aleksandrov, D; Alessandro, B; Alfaro Molina, R; Alici, A; Alkin, A; Almaráz Aviña, E; Alme, J; Alt, T; Altini, V; Altinpinar, S; Altsybeev, I; Andrei, C; Andronic, A; Anguelov, V; Anielski, J; Antičić, T; Antinori, F; Antonioli, P; Aphecetche, L; Appelshäuser, H; Arbor, N; Arcelli, S; Arend, A; Armesto, N; Arnaldi, R; Aronsson, T; Arsene, I C; Arslandok, M; Augustinus, A; Averbeck, R; Awes, T C; Aystö, J; Azmi, M D; Bach, M; Badalà, A; Baek, Y W; Bailhache, R; Bala, R; Baldini Ferroli, R; Baldisseri, A; Baldit, 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; Bastid, N; Basu, S; Bathen, B; Batigne, G; Batyunya, B; Baumann, C; Bearden, I G; Beck, H; Belikov, I; Bellini, F; Bellwied, R; Belmont-Moreno, E; Bencedi, G; Beole, S; Berceanu, I; Bercuci, A; Berdnikov, Y; Berenyi, D; Berzano, D; Betev, L; Bhasin, A; Bhati, A K; Bhom, J; Bianchi, L; Bianchi, N; Bianchin, C; Bielčík, J; Bielčíková, J; Bilandzic, A; Bjelogrlic, S; Blanco, F; Blanco, F; Blau, D; Blume, C; Bock, N; Bogdanov, A; Bøggild, H; Bogolyubsky, M; Boldizsár, L; Bombara, M; Book, J; Borel, H; Borissov, A; Bose, S; Bossú, F; Botje, M; Böttger, S; Boyer, B; Braidot, E; Braun-Munzinger, P; Bregant, M; Breitner, T; Browning, T A; Broz, M; Brun, R; Bruna, E; Bruno, G E; Budnikov, D; Buesching, H; Bufalino, S; Bugaiev, K; Busch, O; Buthelezi, Z; Caballero Orduna, D; Caffarri, D; Cai, X; Caines, H; Calvo Villar, E; Camerini, P; Canoa Roman, V; Cara Romeo, G; Carena, F; Carena, W; Carminati, F; Casanova Díaz, A; Castillo Castellanos, J; 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; Chawla, I; Cherney, M; Cheshkov, C; Cheynis, B; Chiavassa, E; 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; Coccetti, F; Colamaria, F; Colella, D; Conesa Balbastre, G; Conesa Del Valle, Z; Constantin, P; Contin, G; Contreras, J G; Cormier, T M; Corrales Morales, Y; Cortés Maldonado, I; Cortese, P; Cosentino, M R; Costa, F; Cotallo, M E; Crochet, P; Cruz Alaniz, E; Cuautle, E; Cunqueiro, L; Erasmo, G D; Dainese, A; Dalsgaard, H H; Danu, A; Das, D; Das, I; Das, K; Dash, A; Dash, S; De, S; 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 Rooij, R; Del Castillo Sanchez, E; Delagrange, H; Deloff, A; Demanov, V; Dénes, E; Deppman, A; Di Bari, D; Di Giglio, C; Di Liberto, S; Di Mauro, A; Di Nezza, P; Diaz Corchero, M A; Dietel, T; Divià, R; Djuvsland, O; Dobrin, A; Dobrowolski, T; Domínguez, I; Dönigus, B; Dordic, O; Driga, O; Dubey, A K; Ducroux, L; Dupieux, P; Dutta Majumdar, A K; Dutta Majumdar, M R; Elia, D; Emschermann, D; Engel, H; Erdal, H A; Espagnon, B; Estienne, M; Esumi, S; Evans, D; Eyyubova, G; Fabris, D; Faivre, J; Falchieri, D; Fantoni, A; Fasel, M; Fearick, R; Fedunov, A; Fehlker, D; Feldkamp, L; Felea, D; Fenton-Olsen, B; Feofilov, G; Fernández Téllez, A; Ferretti, A; Ferretti, R; Figiel, J; Figueredo, M A S; Filchagin, S; Finogeev, D; Fionda, F M; Fiore, E M; Floris, M; Foertsch, S; Foka, P; Fokin, S; Fragiacomo, E; Fragkiadakis, M; Frankenfeld, U; Fuchs, U; Furget, C; Fusco Girard, M; Gaardhøje, J J; Gagliardi, M; Gago, A; Gallio, M; Gangadharan, D R; Ganoti, P; Garabatos, C; Garcia-Solis, E; Garishvili, I; Gerhard, J; Germain, M; Geuna, C; Gheata, A; Gheata, M; Ghidini, B; Ghosh, P; Gianotti, P; Girard, M R; Giubellino, P; Gladysz-Dziadus, E; Glässel, P; Gomez, R; Ferreiro, E G; González-Trueba, L H; González-Zamora, P; Gorbunov, S; Goswami, A; Gotovac, S; Grabski, V; Graczykowski, L K; Grajcarek, R; Grelli, A; Grigoras, A; Grigoras, C; Grigoriev, V; Grigoryan, A; Grigoryan, S; Grinyov, B; Grion, N; Grosse-Oetringhaus, J F; Grossiord, J-Y; Grosso, R; Guber, F; Guernane, R; Guerra Gutierrez, C; Guerzoni, B; Guilbaud, M; Gulbrandsen, K; Gunji, T; Gupta, A; Gupta, R; Gutbrod, H; Haaland, O; Hadjidakis, C; Haiduc, M; Hamagaki, H; Hamar, G; Hanratty, L D; Hansen, A; Harmanova, Z; Harris, J W; Hartig, M; Hasegan, D; Hatzifotiadou, D; Hayrapetyan, A; Heckel, S T; Heide, M; Helstrup, H; Herghelegiu, A; Herrera Corral, G; Herrmann, N; Hess, B A; Hetland, K F; Hicks, B; Hille, P T; Hippolyte, B; Horaguchi, T; Hori, Y; Hristov, P; Hřivnáčová, I; Huang, M; Humanic, T J; Hwang, D S; Ichou, R; Ilkaev, R; Ilkiv, I; Inaba, M; Incani, E; Innocenti, G M; Ippolitov, M; Irfan, M; Ivan, C; Ivanov, A; Ivanov, M; Ivanov, V; Ivanytskyi, O; Jachołkowski, A; Jacobs, P M; Jancurová, L; Jang, H J; Jangal, S; Janik, M A; Janik, R; Jayarathna, P H S Y; Jena, S; Jha, D M; Jimenez Bustamante, R T; Jirden, L; Jones, P G; Jung, H; Jusko, A; Kakoyan, V; Kalcher, S; Kaliňák, P; Kalisky, M; Kalliokoski, T; Kalweit, A; Kanaki, K; Kang, J H; Kaplin, V; Karasu Uysal, A; Karavichev, O; Karavicheva, T; Karpechev, E; Kazantsev, A; Kebschull, U; Keidel, R; Khan, M M; Khan, S A; Khanzadeev, A; Kharlov, Y; Kileng, B; Kim, B; Kim, D J; Kim, D W; Kim, J H; Kim, J S; Kim, M; Kim, S; Kim, S H; Kim, T; Kirsch, S; Kisel, I; Kiselev, S; Kisiel, A; Klay, J L; Klein, J; Klein-Bösing, C; Kliemant, M; Kluge, A; Knichel, M L; Knospe, A G; Koch, K; Köhler, M K; Kolojvari, A; Kondratiev, V; Kondratyeva, N; Konevskikh, A; Korneev, A; Kour, R; Kowalski, M; Kox, S; Koyithatta Meethaleveedu, G; Kral, J; Králik, I; Kramer, F; Kraus, I; Krawutschke, T; Krelina, M; Kretz, M; Krivda, M; Krizek, F; Krus, M; Kryshen, E; Krzewicki, M; Kucheriaev, Y; Kuhn, C; Kuijer, P G; Kurashvili, P; Kurepin, A; Kurepin, A B; Kuryakin, A; Kushpil, S; Kushpil, V; Kweon, M J; Kwon, Y; La Pointe, S L; La Rocca, P; Ladrón de Guevara, P; 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    2012-12-21

    The first measurement of neutron emission in electromagnetic dissociation of ^{208}Pb nuclei at the LHC is presented. The measurement is performed using the neutron zero degree calorimeters of the ALICE experiment, which detect neutral particles close to beam rapidity. The measured cross sections of single and mutual electromagnetic dissociation of Pb nuclei at sqrt[s(NN)]=2.76 TeV with neutron emission are σ(singleEMD)=187.4 ± 0.2(stat)(-11.2)(+13.2) (syst) b and σ(mutualEMD) = 5.7 ± 0.1(stat) ± 0.4(syst) b, respectively. The experimental results are compared to the predictions from a relativistic electromagnetic dissociation model. PMID:23368454

  9. Measurement of the Cross Section for Electromagnetic Dissociation with Neutron Emission in Pb-Pb Collisions at √sNN = 2.76 TeV

    CERN Document Server

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Kim, Seon Hee; Kim, Taesoo; Kirsch, Stefan; Kisel, Ivan; Kiselev, Sergey; Kisiel, Adam Ryszard; Klay, Jennifer Lynn; Klein, Jochen; Klein-Bosing, Christian; Kliemant, Michael; Kluge, Alexander; Knichel, Michael Linus; Knospe, Anders Garritt; Koch, Kathrin; Kohler, Markus; Kolojvari, Anatoly; Kondratiev, Valery; Kondratyeva, Natalia; Konevskih, Artem; Korneev, Andrey; Kour, Ravjeet; Kowalski, Marek; Kox, Serge; Koyithatta Meethaleveedu, Greeshma; Kral, Jiri; Kralik, Ivan; Kramer, Frederick; Kraus, Ingrid Christine; Krawutschke, Tobias; Krelina, Michal; Kretz, Matthias; Krivda, Marian; Krizek, Filip; Krus, Miroslav; Kryshen, Evgeny; Krzewicki, Mikolaj; Kucheriaev, Yury; Kuhn, Christian Claude; Kuijer, Paul; Kurashvili, Podist; Kurepin, A; Kurepin, AB; Kuryakin, Alexey; Kushpil, Svetlana; Kushpil, Vasily; Kweon, Min Jung; Kwon, Youngil; La Pointe, Sarah Louise; La Rocca, Paola; Ladron de Guevara, Pedro; Lakomov, Igor; Langoy, Rune; Lara, Camilo Ernesto; Lardeux, Antoine Xavier; Lazzeroni, Cristina; Le Bornec, Yves; Lea, Ramona; Lechman, Mateusz; Lee, Ki Sang; Lee, Sung Chul; Lefevre, Frederic; Lehnert, Joerg Walter; Leistam, Lars; Lemmon, Roy Crawford; Lenhardt, Matthieu Laurent; Lenti, Vito; Leon Monzon, Ildefonso; Leon Vargas, Hermes; Leoncino, Marco; Levai, Peter; Lien, Jorgen; Lietava, Roman; Lindal, Svein; Lindenstruth, Volker; Lippmann, Christian; Lisa, Michael Annan; Liu, Lijiao; Loenne, Per-Ivar; Loggins, Vera; Loginov, Vitaly; Lohn, Stefan Bernhard; Lohner, Daniel; Loizides, Constantinos; Loo, Kai Krister; Lopez, Xavier Bernard; Lopez Torres, Ernesto; Lovhoiden, Gunnar; Lu, Xianguo; Luettig, Philipp; Lunardon, Marcello; Luo, Jiebin; Luparello, Grazia; Luquin, Lionel; Luzzi, Cinzia; Ma, Rongrong; Maevskaya, Alla; Mager, Magnus; Mahapatra, Durga Prasad; Maire, Antonin; Mal'Kevich, Dmitry; Malaev, Mikhail; Maldonado Cervantes, Ivonne Alicia; Malinina, Ludmila; Malzacher, Peter; Mamonov, Alexander; Manceau, Loic Henri Antoine; Manko, Vladislav; Manso, Franck; Manzari, Vito; Mao, Yaxian; Marchisone, Massimiliano; Mares, Jiri; Margagliotti, Giacomo Vito; Margotti, Anselmo; Marin, Ana Maria; Marin Tobon, Cesar Augusto; Markert, Christina; Martashvili, Irakli; Martinengo, Paolo; Martinez, Mario Ivan; Martinez Davalos, Arnulfo; Martinez Garcia, Gines; Martynov, Yevgen; Mas, Alexis Jean-Michel; Masciocchi, Silvia; Masera, Massimo; Masoni, Alberto; Mastromarco, Mario; Mastroserio, Annalisa; Matthews, Zoe Louise; Matyja, Adam Tomasz; Mayani, Daniel; Mayer, Christoph; Mazer, Joel; Mazzoni, Alessandra Maria; Meddi, Franco; Menchaca-Rocha, Arturo Alejandro; Mercado Perez, Jorge; Meres, Michal; Miake, Yasuo; Milano, Leonardo; Milosevic, Jovan; Mischke, Andre; Mishra, Aditya Nath; Miskowiec, Dariusz; Mitu, Ciprian Mihai; Mlynarz, Jocelyn; Mohanty, Ajit Kumar; Mohanty, Bedangadas; Molnar, Levente; Montano Zetina, Luis Manuel; Monteno, Marco; Montes, Esther; Moon, Taebong; Morando, Maurizio; Moreira De Godoy, Denise Aparecida; Moretto, Sandra; Morsch, Andreas; Muccifora, Valeria; Mudnic, Eugen; Muhuri, Sanjib; Mukherjee, Maitreyee; Muller, Hans; Munhoz, Marcelo; Musa, Luciano; Musso, Alfredo; Nandi, Basanta Kumar; Nania, Rosario; Nappi, Eugenio; Nattrass, Christine; Naumov, Nikolay; Navin, Sparsh; Nayak, Tapan Kumar; Nazarenko, Sergey; Nazarov, Gleb; Nedosekin, Alexander; Nicassio, Maria; Nielsen, Borge Svane; Niida, Takafumi; Nikolaev, Sergey; Nikolic, Vedran; Nikulin, Sergey; Nikulin, Vladimir; Nilsen, Bjorn Steven; Nilsson, Mads Stormo; Noferini, Francesco; Nomokonov, Petr; Nooren, Gerardus; Novitzky, Norbert; Nyanin, Alexandre; Nyatha, Anitha; Nygaard, Casper; Nystrand, Joakim Ingemar; Oeschler, Helmut Oskar; Oh, Saehanseul; Oh, Sun Kun; Oleniacz, Janusz; Oppedisano, Chiara; Ortiz Velasquez, Antonio; Ortona, Giacomo; Oskarsson, Anders Nils Erik; Otwinowski, Jacek Tomasz; Oyama, Ken; Pachmayer, Yvonne Chiara; Pachr, Milos; Padilla, Fatima; Pagano, Paola; Paic, Guy; Painke, Florian; Pajares, Carlos; Pal, S; Pal, Susanta Kumar; Palaha, Arvinder Singh; Palmeri, Armando; Papikyan, Vardanush; Pappalardo, Giuseppe; Park, Woo Jin; Passfeld, Annika; Patalakha, Dmitri Ivanovich; Paticchio, Vincenzo; Pavlinov, Alexei; Pawlak, Tomasz Jan; Peitzmann, Thomas; Pereira Da Costa, Hugo Denis Antonio; Pereira De Oliveira Filho, Elienos; Peresunko, Dmitri; Perez Lara, Carlos Eugenio; Perez Lezama, Edgar; Perini, Diego; Perrino, Davide; Peryt, Wiktor Stanislaw; Pesci, Alessandro; Peskov, Vladimir; Pestov, Yury; Petracek, Vojtech; Petran, Michal; Petris, Mariana; Petrov, Plamen Rumenov; Petrovici, Mihai; Petta, Catia; Piano, Stefano; Piccotti, Anna; Pikna, Miroslav; Pillot, Philippe; Pinazza, Ombretta; Pinsky, Lawrence; Pitz, Nora; Piuz, Francois; Piyarathna, Danthasinghe; Ploskon, Mateusz Andrzej; Pluta, Jan Marian; Pocheptsov, Timur; Pochybova, Sona; Podesta Lerma, Pedro Luis Manuel; Poghosyan, Martin; Polichtchouk, Boris; Pop, Amalia; Porteboeuf-Houssais, Sarah; Pospisil, Vladimir; Potukuchi, Baba; Prasad, Sidharth Kumar; Preghenella, Roberto; Prino, Francesco; Pruneau, Claude Andre; Pshenichnov, Igor; Puchagin, Sergey; Puddu, Giovanna; Pujol Teixido, Jordi; Pulvirenti, Alberto; Punin, Valery; Putis, Marian; Putschke, Jorn Henning; Quercigh, Emanuele; Qvigstad, Henrik; Rachevski, Alexandre; Rademakers, Alphonse; Radomski, Sylwester; Raiha, Tomi Samuli; Rak, Jan; Rakotozafindrabe, Andry Malala; Ramello, Luciano; Ramirez Reyes, Abdiel; Raniwala, Rashmi; Raniwala, Sudhir; Rasanen, Sami Sakari; Rascanu, Bogdan Theodor; Rathee, Deepika; Read, Kenneth Francis; Real, Jean-Sebastien; Redlich, Krzysztof; Reichelt, Patrick; Reicher, Martijn; Renfordt, Rainer Arno Ernst; Reolon, Anna Rita; Reshetin, Andrey; Rettig, Felix Vincenz; Revol, Jean-Pierre; Reygers, Klaus Johannes; Riccati, Lodovico; Ricci, Renato Angelo; Richert, Tuva; Richter, Matthias Rudolph; Riedler, Petra; Riegler, Werner; Riggi, Francesco; Rodrigues Fernandes Rabacal, Bartolomeu; Rodriguez Cahuantzi, Mario; Rodriguez Manso, Alis; Roed, Ketil; Rohr, David; Rohrich, Dieter; Romita, Rosa; Ronchetti, Federico; Rosnet, Philippe; Rossegger, Stefan; Rossi, Andrea; Roukoutakis, Filimon; Roy, Christelle Sophie; Roy, Pradip Kumar; Rubio Montero, Antonio Juan; Rui, Rinaldo; Ryabinkin, Evgeny; Rybicki, Andrzej; Sadovsky, Sergey; Safarik, Karel; Sahoo, Raghunath; Sahu, Pradip Kumar; Saini, Jogender; Sakaguchi, Hiroaki; Sakai, Shingo; Sakata, Dosatsu; Salgado, Carlos Albert; Salzwedel, Jai; Sambyal, Sanjeev Singh; Samsonov, Vladimir; Sanchez Castro, Xitzel; Sandor, Ladislav; Sandoval, Andres; Sano, Masato; Sano, Satoshi; Santo, Rainer; Santoro, Romualdo; Sarkamo, Juho Jaako; Scapparone, Eugenio; Scarlassara, Fernando; Scharenberg, Rolf Paul; Schiaua, Claudiu Cornel; Schicker, Rainer Martin; Schmidt, Christian Joachim; Schmidt, Hans Rudolf; Schreiner, Steffen; Schuchmann, Simone; Schukraft, Jurgen; Schutz, Yves Roland; Schwarz, Kilian Eberhard; Schweda, Kai Oliver; Scioli, Gilda; Scomparin, Enrico; Scott, Patrick Aaron; Scott, Rebecca; Segato, Gianfranco; Selioujenkov, Ilya; Senyukov, Serhiy; Seo, Jeewon; Serci, Sergio; Serradilla, Eulogio; Sevcenco, Adrian; Sgura, Irene; Shabetai, Alexandre; Shabratova, Galina; Shahoyan, Ruben; Sharma, Natasha; Sharma, Satish; Shigaki, Kenta; Shimomura, Maya; Shtejer, Katherin; Sibiriak, Yury; Siciliano, Melinda; Sicking, Eva; Siddhanta, Sabyasachi; Siemiarczuk, Teodor; Silvermyr, David Olle Rickard; Silvestre, catherine; Simonetti, Giuseppe; Singaraju, Rama Narayana; Singh, Ranbir; Singha, Subhash; Sinha, Bikash; Sinha, Tinku; Sitar, Branislav; Sitta, Mario; Skaali, Bernhard; Skjerdal, Kyrre; Smakal, Radek; Smirnov, Nikolai; Snellings, Raimond; Sogaard, Carsten; Soltz, Ron Ariel; Son, Hyungsuk; Song, Jihye; Song, Myunggeun; Soos, Csaba; Soramel, Francesca; Sputowska, Iwona; Spyropoulou-Stassinaki, Martha; Srivastava, Brijesh Kumar; Stachel, Johanna; Stan, Ionel; Stefanek, Grzegorz; Stefanini, Giorgio; Steinbeck, Timm Morten; Steinpreis, Matthew; Stenlund, Evert Anders; Steyn, Gideon Francois; Stiller, Johannes Hendrik; Stocco, Diego; Stolpovskiy, Mikhail; Strabykin, Kirill; Strmen, Peter; Suaide, Alexandre Alarcon do Passo; Subieta Vasquez, Martin Alfonso; Sugitate, Toru; Suire, Christophe Pierre; Sukhorukov, Mikhail; Sultanov, Rishat; Sumbera, Michal; Susa, Tatjana; Szanto de Toledo, Alejandro; Szarka, Imrich; Szczepankiewicz, Adam; Szostak, Artur Krzysztof; Tagridis, Christos; Takahashi, Jun; Tapia Takaki, Daniel Jesus; Tauro, Arturo; Tejeda Munoz, Guillermo; Telesca, Adriana; Terrevoli, Cristina; Thader, Jochen Mathias; Thomas, Deepa; Tieulent, Raphael Noel; Timmins, Anthony; Tlusty, David; Toia, Alberica; Torii, Hisayuki; Tosello, Flavio; Trzaska, Wladyslaw Henryk; Tsuji, Tomoya; Tumkin, Alexandr; Turrisi, Rosario; Tveter, Trine Spedstad; Ulery, Jason Glyndwr; Ullaland, Kjetil; Ulrich, Jochen; Uras, Antonio; Urban, Jozef; Urciuoli, Guido Marie; Usai, Gianluca; Vajzer, Michal; Vala, Martin; Valencia Palomo, Lizardo; Vallero, Sara; van der Kolk, Naomi; van Leeuwen, Marco; Vande Vyvre, Pierre; Vannucci, Luigi; Vargas, Aurora Diozcora; Varma, Raghava; Vasileiou, Maria; Vasiliev, Andrey; Vechernin, Vladimir; Veldhoen, Misha; Venaruzzo, Massimo; Vercellin, Ermanno; Vergara, Sergio; Vernet, Renaud; Verweij, Marta; Vickovic, Linda; Viesti, Giuseppe; Vikhlyantsev, Oleg; Vilakazi, Zabulon; Villalobos Baillie, Orlando; Vinogradov, Alexander; Vinogradov, Leonid; Vinogradov, Yury; Virgili, Tiziano; Viyogi, Yogendra; Vodopianov, Alexander; Voloshin, Kirill; Voloshin, Sergey; Volpe, Giacomo; von Haller, Barthelemy; Vranic, Danilo; vrebekk, Gaute; Vrlakova, Janka; Vulpescu, Bogdan; Vyushin, Alexey; Wagner, Boris; Wagner, Vladimir; Wan, Renzhuo; Wang, Dong; Wang, Mengliang; Wang, Yifei; Wang, Yaping; Watanabe, Kengo; Wessels, Johannes; Westerhoff, Uwe; Wiechula, Jens; Wikne, Jon; Wilde, Martin Rudolf; Wilk, Alexander; Wilk, Grzegorz Andrzej; Williams, Crispin; Windelband, Bernd Stefan; Xaplanteris Karampatsos, Leonidas; Yaldo, Chris G; Yang, Hongyan; Yang, Shiming; Yasnopolsky, Stanislav; Yi, JunGyu; Yin, Zhongbao; Yoo, In-Kwon; Yoon, Jongik; Yu, Weilin; Yuan, Xianbao; Yushmanov, Igor; Zach, Cenek; Zampolli, Chiara; Zaporozhets, Sergey; Zarochentsev, Andrey; Zavada, Petr; Zaviyalov, Nikolai; Zbroszczyk, Hanna Paulina; Zelnicek, Pierre; Zgura, Sorin Ion; Zhalov, Mikhail; Zhang, Haitao; Zhang, Xiaoming; Zhou, Daicui; Zhou, Fengchu; Zhou, You; Zhu, Jianhui; Zhu, Xiangrong; Zichichi, Antonino; Zimmermann, Alice; Zinovjev, Gennady; Zoccarato, Yannick Denis; Zynovyev, Mykhaylo

    2012-01-01

    The first measurement of neutron emission in electromagnetic dissociation of 208Pb nuclei at the LHC is presented. The measurement is performed using the neutron Zero Degree Calorimeters of the ALICE experiment, which detect neutral particles close to beam rapidity. The measured cross sections of single and mutual electromagnetic dissociation of Pb nuclei at √sNN = 2.76 TeV with neutron emission are σ_single EMD = 187.2±0.2 (stat.) +13.8−12.0 (syst.) b and σ_mutual EMD = 6.2 ± 0.1 (stat.) ±0.4 (syst.) b respectively. The experimental results are compared to the predictions from a relativistic electromagnetic dissociation model.

  10. CDF End Plug calorimeter Upgrade Project

    International Nuclear Information System (INIS)

    We report on the status of the CDF End Plug Upgrade Project. In this project, the CDF calorimeters in the end plug and the forward regions will be replaced by a single scintillator based calorimeter. After an extensive R ampersand D effort on the tile/fiber calorimetry, we have now advanced to a construction phase. We review the results of the R ampersand D leading to the final design of the calorimeters and the development of tooling devised for this project. The quality control program of the production of the electromagnetic and hadronic calorimeters is described. A shower maximum detector for the measurement of the shower centroid and the shower profile of electrons, γ and π0 has been designed. Its performance requirements, R ampersand D results and mechanical design are discussed

  11. Overview of the LHCb Calorimeter Detectors

    CERN Document Server

    Perret, P

    2013-01-01

    The LHCb calorimeter system is composed of four subdetectors: an electromagnetic calorimeter (ECAL) followed by a hadron calorimeter (HCAL). In addition the system includes in front of them the Scintillating Pad Detector (SPD) and Pre-Shower (PS). It is used to select transverse energy hadron, electron and photon candidates for the first trigger level and it provides the identification of electrons, photons and hadrons as well as the measurement of their energies and positions. The design and construction characteristics of the LHCb calorimeter will be recalled. Strategies for monitoring and calibration during data taking will be detailed in all aspects. Scintillating fibres, plastics and photomultipliers suffer from ageing due to radiation damage or high currents. Different methods which are used to calibrate the detectors and to recover the initial performances will be presented. The performances achieved will be illustrated in selected channels of interest for B physics.

  12. Uranium scintillator calorimeter at the CERN ISR

    International Nuclear Information System (INIS)

    The design, Monte Carlo studies and test beam results of a uranium/scintillator calorimeter to be installed in the Intersecting Storage Ring (ISR) at CERN are described. In its final stage the calorimeter will cover the full azimuth over a polar region of 450 0. The full calorimeter is built in a modular way from 128 stacks, with each stack internally subdivided into six cells of 20 x 20 cm2 cross section. The readout is by wavelength shifting (WLS) plates with a separate readout of the front part of the calorimeter (first ten plates) to allow electromagnetic/hadronic separation. Since the readout plates are on both sides of the cells, position information is obtained from the left/right ratio

  13. Alice - The Virtual Secretary

    DEFF Research Database (Denmark)

    Hansen, Thomas K.

    2009-01-01

    of the primary ideas behind using animated agents is, quoting Wik and Granström (2007), to transform the well-known desktop metaphor of the PC, into a more human metaphor, thereby increasing the authenticity of our interaction with technology. At Knowledge Lab we have combined three different technologies...... in order to create Alice – The virtual secretary....

  14. 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.

  15. Physics results from ALICE

    CERN Document Server

    Ramello, Luciano

    2015-01-01

    In this lecture I present the status of experimental search and study of the Quark-Gluon Plasma in Pb-Pb collisions at the CERN LHC by the ALICE Collaboration based on the data-taking during years 2010-13 (LHC Run 1), as well as results from pp and p-Pb collisions

  16. First ALICE detectors installed!

    CERN Multimedia

    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...

  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. The ALICE Electronic Logbook

    International Nuclear Information System (INIS)

    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.

  19. 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.

  20. ALICE silicon strip module

    CERN Multimedia

    Maximilien Brice

    2006-01-01

    This small silicon detector strip will be inserted into the inner tracking system (ITS) on the ALICE detector at CERN. This detector relies on state-of-the-art particle tracking techniques. These double-sided silicon strip modules have been designed to be as lightweight and delicate as possible as the ITS will eventually contain five square metres of these devices.

  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 LHCb EM calorimeter and π0 detection

    International Nuclear Information System (INIS)

    The LHCb calorimeter system comprises a preshower detector, an electromagnetic and a hadronic calorimeter. The purpose of the calorimeters is to identify and provide an energy and position measurement of photons, electrons and hadrons. The calorimeters are an essential part of the LHCb trigger, and are used in offline analysis. Good photon identification is important for the study of B decays with π0s in the final state, an example of which is the Bd0→ π+π-π0 decay. This provides an alternative channel to Bd0→ π+π- for the measurement of the angle α of the unitarity triangle

  3. L0/L1 trigger generation by the ALICE PHOS detector

    CERN Document Server

    Lijiao, Liu

    Quark-Gluon Plasma (QGP) is a phase that exists above a critical temperature and corresponding energy density according to the theory of Quantum Chromo-Dynamics (QCD). The studies of the QGP help us to understand the early evolution of our universe and the Standard Model. A large Ion Collider Experiment (ALICE) aims to study the properties of the QGP. A QGP can not be observed directly because it is a short lived state. Signatures such as jet quenching, flow pattern and high pT suppression indicate the existence of a QGP. Various sub-detectors are designed for detecting these signatures. The PHOton Spectrometer (PHOS), one of the sub-detectors, is a high-resolution electromagnetic calorimeter dedicated to the precise measurement of direct photon and neutral meson yields in a pT range up to 100 GeV/c. Four online systems are developed to monitor, control and read out the different subdetectors. The trigger system is one of them. The task of the trigger system is to select events of interest and to reduce the o...

  4. Readiness of the ATLAS Liquid Argon Calorimeter for LHC Collisions

    CERN Document Server

    Aad, G; Abdallah, J; Abdelalim, A A; Abdesselam, A; Abdinov, O; Abi, B; Abolins, M; Abramowicz, H; Abreu, H; Acharya, B S; Adams, D L; Addy, T N; Adelman, J; Adorisio, C; Adragna, P; Adye, T; Aefsky, S; Aguilar-Saavedra, J A; Aharrouche, M; Ahlen, S P; Ahles, F; Ahmad, A; Ahmed, H; Ahsan, M; Aielli, G; Akdogan, T; Åkesson, T P A; Akimoto, G; Akimov, A V; Aktas, A; Alam, M S; Alam, M A; Albert, J; Albrand, S; Aleksa, M; Aleksandrov, I N; Alessandria, F; Alexa, C; Alexander, G; Alexandre, G; Alexopoulos, T; Alhroob, M; Aliev, M; Alimonti, G; Alison, J; Aliyev, M; Allport, P P; Allwood-Spiers, S E; Almond, J; Aloisio, A; Alon, R; Alonso, A; Alviggi, M G; Amako, K; Amelung, C; Ammosov, V V; Amorim, A; Amorós, G; Amram, N; Anastopoulos, C; Andeen, T; Anders, C F; Anderson, K J; Andreazza, A; Andrei, V; Anduaga, X S; Angerami, A; Anghinolfi, F; Anjos, N; Antonaki, A; Antonelli, M; Antonelli, S; Antunovic, B; Anulli, F; Aoun, S; Arabidze, G; Aracena, I; Arai, Y; Arce, A T H; Archambault, J P; Arfaoui, S; Arguin, J-F; Argyropoulos, T; Arik, E; Arik, M; Armbruster, A J; Arnaez, O; Arnault, C; Artamonov, A; Arutinov, D; Asai, M; Asai, S; Asfandiyarov, R; Ask, S; Åsman, B; Asner, D; Asquith, L; Assamagan, K; Astbury, A; Astvatsatourov, A; Atoian, G; Auerbach, B; Auge, E; Augsten, K; Aurousseau, M; Austin, N; Avolio, G; Avramidou, R; Axen, D; Ay, C; Azuelos, G; Azuma, Y; Baak, M A; Baccaglioni, G; Bacci, C; Bach, A; Bachacou, H; Bachas, K; Backes, M; Badescu, E; Bagnaia, P; Bai, Y; Bailey, D C; Bain, T; Baines, J T; Baker, O K; Baker, M D; Baltasar Dos Santos Pedrosa, F; Banas, E; Banerjee, P; Banerjee, S; Banfi, D; Bangert, A; Bansal, V; Baranov, S P; Baranov, S; Barashkou, A; Barber, T; Barberio, E L; Barberis, D; Barbero, M; Bardin, D Y; Barillari, T; Barisonzi, M; Barklow, T; Barlow, N; Barnett, B M; Barnett, R M; Baron, S; Baroncelli, A; Barr, A J; Barreiro, F; BarreiroGuimarães da Costa, J; Barrillon, P; Barros, N; Bartoldus, R; Bartsch, D; Bastos, J; Bates, R L; Bathe, S; Batkova, L; Batley, J R; Battaglia, A; Battistin, M; Bauer, F; Bawa, H S; Bazalova, M; Beare, B; Beau, T; Beauchemin, P H; Beccherle, R; Becerici, N; Bechtle, P; Beck, G A; Beck, H P; Beckingham, M; Becks, K H; Bedajanek, I; Beddall, A J; Beddall, A; Bednár, P; Bednyakov, V A; Bee, C; Begel, M; Behar Harpaz, S; Behera, P K; Beimforde, M; Belanger-Champagne, C; Bell, P J; Bell, W H; Bella, G; Bellagamba, L; Bellina, F; Bellomo, M; Belloni, A; Belotskiy, K; Beltramello, O; Ben Ami, S; Benary, O; Benchekroun, D; Bendel, M; Benedict, B H; Benekos, N; Benhammou, Y; Benincasa, G P; Benjamin, D P; Benoit, M; Bensinger, J R; Benslama, K; Bentvelsen, S; Beretta, M; Berge, D; Bergeaas Kuutmann, E; Berger, N; Berghaus, F; Berglund, E; Beringer, J; Bernardet, K; Bernat, P; Bernhard, R; Bernius, C; Berry, T; Bertin, A; Besson, N; Bethke, S; Bianchi, R M; Bianco, M; Biebel, O; Biesiada, J; Biglietti, M; Bilokon, H; Bindi, M; Binet, S; Bingul, A; Bini, C; Biscarat, C; Bitenc, U; Black, K M; Blair, R E; Blanchard, J-B; Blanchot, G; Blocker, C; Blocki, J; Blondel, A; Blum, W; Blumenschein, U; Bobbink, G J; Bocci, A; Boehler, M; Boek, J; Boelaert, N; Böser, S; Bogaerts, J A; Bogouch, A; Bohm, C; Bohm, J; Boisvert, V; Bold, T; Boldea, V; Boldyrev, A; Bondarenko, V G; Bondioli, M; Boonekamp, M; Booth, J R A; Bordoni, S; Borer, C; Borisov, A; Borissov, G; Borjanovic, I; Borroni, S; Bos, K; Boscherini, D; Bosman, M; Bosteels, M; Boterenbrood, H; Bouchami, J; Boudreau, J; Bouhova-Thacker, E V; Boulahouache, C; Bourdarios, C; Boyd, J; Boyko, I R; Bozovic-Jelisavcic, I; Bracinik, J; Braem, A; Branchini, P; Brandenburg, G W; Brandt, A; Brandt, G; Brandt, O; Bratzler, U; Brau, B; Brau, J E; Braun, H M; Brelier, B; Bremer, J; Brenner, R; Bressler, S; Breton, D; Brett, N D; Britton, D; Brochu, F M; Brock, I; Brock, R; Brodbeck, T J; Brodet, E; Broggi, F; Bromberg, C; Brooijmans, G; Brooks, W K; Brown, G; Brubaker, E; Bruckman de Renstrom, P A; Bruncko, D; Bruneliere, R; Brunet, S; Bruni, A; Bruni, G; Bruschi, M; Buanes, T; Bucci, F; Buchanan, J; Buchholz, P; Buckley, A G; Budagov, I A; Budick, B; Büscher, V; Bugge, L; Bulekov, O; Bunse, M; Buran, T; Burckhart, H; Burdin, S; Burgess, T; Burke, S; Busato, E; Bussey, P; Buszello, C P; Butin, F; Butler, B; Butler, J M; Buttar, C M; Butterworth, J M; Byatt, T; Caballero, J; Cabrera Urbán, S; Caforio, D; Cakir, O; Calafiura, P; Calderini, G; Calfayan, P; Calkins, R; Caloba, L P; Caloi, R; Calvet, D; Camarri, P; Cambiaghi, M; Cameron, D; Campabadal-Segura, F; Campana, S; Campanelli, M; Canale, V; Canelli, F; Canepa, A; Cantero, J; Capasso, L; Capeans-Garrido, M D M; Caprini, I; Caprini, M; Capua, M; Caputo, R; Caracinha, D; Caramarcu, C; Cardarelli, R; Carli, T; Carlino, G; Carminati, L; Caron, B; Caron, S; Carrillo Montoya, G D; Carron Montero, S; Carter, A A; Carter, J R

    2010-01-01

    The ATLAS liquid argon calorimeter has been operating continuously since August 2006. At this time, only part of the calorimeter was readout, but since the beginning of 2008, all calorimeter cells have been connected to the ATLAS readout system in preparation for LHC collisions. This paper gives an overview of the liquid argon calorimeter performance measured in situ with random triggers, calibration data, cosmic muons, and LHC beam splash events. Results on the detector operation, timing performance, electronics noise, and gain stability are presented. High energy deposits from radiative cosmic muons and beam splash events allow to check the intrinsic constant term of the energy resolution. The uniformity of the electromagnetic barrel calorimeter response along eta (averaged over phi) is measured at the percent level using minimum ionizing cosmic muons. Finally, studies of electromagnetic showers from radiative muons have been used to cross-check the Monte Carlo simulation. The performance results obtained u...

  5. Development of a forward calorimeter system for the STAR experiment

    International Nuclear Information System (INIS)

    We present results of an R and D program to develop a forward calorimeter system (FCS) for the STAR experiment at the Relativistic Heavy Ion Collider at BNL. The FCS is a very compact, compensated, finely granulated, high resolution calorimeter system being developed for p+p and p+A program at RHIC. The FCS prototype consists of both electromagnetic and hadron calorimeters. The electromagnetic portion of the detector is constructed with W powder and scintillation fibers. The hadronic calorimeter is a traditional Pb/Sc-plate sandwich design. Both calorimeters were readout with Hamamatsu MPPCs. A full- scale prototype of the FCS was tested with a beam at FNAL in March 2014. We present details of the design, construction technique and performance of the FCS prototype during the test run at FNAL

  6. Status of the ATLAS Liquid Argon Calorimeter and its Performance

    CERN Document Server

    Barillari, T; The ATLAS collaboration

    2011-01-01

    The ATLAS experiment is designed to study the proton-proton collisions produced at the LHC with a centre-of-mass energy of 14 TeV. Liquid argon (LAr) sampling calorimeters are used in ATLAS for all electromagnetic calorimetry covering the pseudorapidity region |eta|<3.2, as well as for hadronic calorimetry from |eta|=1.4 to |eta|=4.8. The calorimeter system consists of an electromagnetic barrel calorimeter and two endcaps with electromagnetic (EMEC), hadronic (HEC) and forward (FCAL) calorimeters. The lead-liquid argon sampling technique with an accordion geometry was chosen for the barrel electromagnetic calorimeter (EMB) and adapted to the endcap (EMEC). This geometry allows a uniform acceptance over the whole azimuthal range without any gap. The hadronic endcap calorimeter (HEC) uses a copper-liquid argon sampling technique with plate geometry and is subdivided into two wheels in depth per end-cap. Finally, the forward calorimeter (FCAL) is composed of three modules featuring cylindrical electrodes ...

  7. Preparation of the ATLAS experiment in the LHC proton collider, performances of the electromagnetic calorimeter and its potentialities for the top quark; Preparation de l'experience ATLAS aupres du futur grand collisionneur de protons LHC: performances du calorimetre electromagnetique et potentiels pour la physique du quark top

    Energy Technology Data Exchange (ETDEWEB)

    Hubaut, F

    2007-03-15

    ATLAS is the biggest and the more complex detector ever built, it will operate on the LHC and is the outcome of a huge international collaboration of 2000 physicists. This document reviews the theoretical and experimental achievements of one of them, his collaboration spread over 7 years and has followed 2 axis. First, the design, construction and test of the electromagnetic calorimeter of ATLAS and secondly, the development of analysis strategies in the physics of the top quark. The expected important production of top quarks in LHC will allow an accurate measurement of the properties of this particle and in the same way will provide new testing areas for the standard model. The top quark, being extremely massive, might play a significant role in the mechanism of electro-weak symmetry breaking. This document is organized into 5 chapters: 1) ATLAS detector, performance and progress, 2) the optimization of the energy measurement with the electromagnetic calorimeter, 3) the performance of the electromagnetic calorimeter, 4) the physics of the top quark, and 5) the potentialities of ATLAS in the top quark sector. This document presented before an academic board will allow its author to manage research works and particularly to tutor thesis students. (A.C.)

  8. Electron identification in and performance of the ND280 Calorimeter

    CERN Document Server

    Carver, Antony

    T2K is an o axis neutrino beam experiment with a baseline of 295 km to the far detector, Super-Kamiokande. The near detector, ND280, measures the ux and energy spectra of electron and muon neutrinos in the direction of Super-Kamiokande. An electromagnetic calorimeter constructed from lead and scintillator surrounds the inner detector. Three time projection chambers and two ne grained scintillator detectors sit inside the calorimeter. This thesis describes the development of a particle identification algorithm for the calorimeter and studies how it can enhance a simple electron neutrino analysis. A particle identification algorithm was written for the electromagnetic calorimeter to separate minimally ionising particles, electromagnetic and hadronic showers. A Monte Carlo study suggested that the algorithm produced an electron sample with a relative muon contamination of 10+-2 whilst maintaining an electron efficiency of 80%. Data collected at CERN was then used to make comparisons between the Monte Carlo simul...

  9. 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).

  10. Central Diffraction at ALICE

    CERN Document Server

    Lämsä, Jerry W

    2011-01-01

    The ALICE experiment is shown to be well suited for studies of exclusive final states from central diffractive reactions. The gluon-rich environment of the central system allows detailed QCD studies and searches for exotic meson states, such as glueballs, hybrids and new charmonium-like states. It would also provide a good testing ground for detailed studies of heavy quarkonia. Due to its central barrel performance, ALICE can accurately measure the low-mass central systems with good purity. The efficiency of the Forward Multiplicity Detector (FMD) and the Forward Shower Counter (FSC) system for detecting rapidity gaps is shown to be adequate for the proposed studies. With this detector arrangement, valuable new data can be obtained by tagging central diffractive processes.

  11. Central diffraction at ALICE

    Energy Technology Data Exchange (ETDEWEB)

    Laemsae, J W; Orava, R, E-mail: risto.orava@helsinki.fi [Helsinki Insitute of Physics, and Division of Elementary Particle Physics, Department of Physics, PL 64 (Gustaf Haellstroeminkatu 2a), FI-00014 University of Helsinki (Finland)

    2011-02-01

    The ALICE experiment is shown to be well suited for studies of exclusive final states from central diffractive reactions. The gluon-rich environment of the central system allows detailed QCD studies and searches for exotic meson states, such as glueballs, hybrids and new charmonium-like states. It would also provide a good testing ground for detailed studies of heavy quarkonia. Due to its central barrel performance, ALICE can accurately measure the low-mass central systems with good purity. The efficiency of the Forward Multiplicity Detector (FMD) and the Forward Shower Counter (FSC) system for detecting rapidity gaps is shown to be adequate for the proposed studies. With this detector arrangement, valuable new data can be obtained by tagging central diffractive processes.

  12. Search for the Higgs boson in 4 leptons at the LHC: study of events with Z bosons and b jets with the ATLAS experiment. Study of the performance of the electromagnetic calorimeter trigger system for high transverse energies

    International Nuclear Information System (INIS)

    The framework of the studies presented in this thesis is the search for the Higgs boson in the 4 leptons channel with the ATLAS experiment. The Higgs boson is a particle whose existence is predicted by the Electroweak theory but has not yet been observed, and its search is one of the main research subjects at the LHC, since its discovery would complete the Standard Model. First, a study of the electromagnetic calorimeter level-one trigger system is presented. Based on data recorded in 2010, it has helped improve the behaviour of the system for very high energy deposits. It has also provided trigger efficiency uncertainties for the analyses searching for W0 and Z0 bosons. Then the measurement with 2010 data of the cross-section of b-jets production in association with Z bosons is discussed. This measurement, which is in agreement with Standard Model computations, constrains one of the important backgrounds in the search for the Higgs boson in 4 leptons: namely the production of a Z boson and b-quark pair. In order to increase the selection efficiency for the Higgs boson decaying into four electrons, an improved electron reconstruction is studied. Its validation is presented for electrons from heavy flavour decays. The search analysis of the Higgs boson in the 4 lepton channel is then described, and several possibilities are studied, to increase the sensitivity of the analysis for low-mass searches. (author)

  13. 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).

  14. 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.

  15. ALICE-ARC integration

    International Nuclear Information System (INIS)

    AliEn or Alice Environment is the Grid middleware 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 inter-operation 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. Therefore, we will concentrate on the second part. Solving it, was somewhat cumbersome, mainly due to the different computing models employed by AliEn and ARC. AliEN uses an Agent based pull model while ARC handles jobs through the more 'traditional' push model. The solution comes as a module implementing the functionalities necessary to achieve AliEn job submission and management to ARC enabled sites

  16. ALICE: ARC integration

    CERN Document Server

    Anderlik, C; Kleist, J; Peters, A; Saiz, P

    2008-01-01

    AliEn or Alice Environment is the Grid middleware 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 inter-operation 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. Therefore, we will concentrate on the second part. Solving it, was somewhat cumbersome, mainly due to the different computing models employed by AliEn and ARC. AliEN uses an Agent based pull model while ARC handles jobs through the more 'traditional' push model. The solution comes as a modu...

  17. The ALICE experiment at the CERN LHC

    International Nuclear Information System (INIS)

    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 x 16 x 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

  18. Last Few Metres for the Barrel Calorimeter

    CERN Multimedia

    Nyman, T.

    On Friday 4th November, the ATLAS Barrel Calorimeter was moved from its assembly point at the side of the ATLAS cavern to the centre of the toroidal magnet system. The detector was finally aligned, to the precision of within a millimetre, on Wednesday 9th November. The ATLAS installation team, led by Tommi Nyman, after having positioned the Barrel Calorimeter in its final location in the ATLAS experimental cavern UX15. The Barrel Calorimeter which will absorb and measure the energy of photons, electrons and hadrons at the core of the ATLAS detector is 8.6 meters in diameter, 6.8 meters long, and weighs over 1600 Tonnes. It consists of two concentric cylindrical detector elements. The innermost comprises aluminium pressure vessels containing the liquid argon electromagnetic calorimeter and the solenoid magnet. The outermost is an assembly of 64 hadron tile calorimeter sectors. Assembled 18 meters away from its final position, the Barrel Calorimeter was relocated with the help of a railway, which allows ...

  19. ATLAS: last few metresfor the Calorimeter

    CERN Multimedia

    2005-01-01

    On Friday 4th November, the ATLAS Barrel Calorimeter was moved from its assembly point at the side of the ATLAS cavern to the centre of the toroidal magnet system. The detector was finally aligned, to the precision of within a millimetre, on Wednesday 9th November. The ATLAS installation team, led by Tommi Nyman, after having positioned the Barrel Calorimeter in its final location in the ATLAS experimental cavern UX15. The Barrel Calorimeter which will absorb and measure the energy of photons, electrons and hadrons at the core of the ATLAS detector is 8.6 meters in diameter, 6.8 meters long, and weighs over 1600 Tonnes. It consists of two concentric cylindrical detector elements. The innermost comprises aluminium pressure vessels containing the liquid argon electromagnetic calorimeter and the solenoid magnet. The outermost is an assembly of 64 hadron tile calorimeter sectors. Assembled 18 meters away from its final position, the Barrel Calorimeter was relocated with the help of a railway, which allows the ...

  20. Mitigation of calorimeter noise.

    Energy Technology Data Exchange (ETDEWEB)

    Santi, P. A. (Peter A.); Bracken, D. S. (David S.); Smith, M. K. (Morag K.)

    2004-01-01

    One of the main factors that limit the sensitivity of calorimeters is the noise in the calorimeter response. A previous study into the sources of noise in a Wheatstone bridge calorimeter used by Department of Energy (DOE) facilities has shown that the control system for maintaining the water bath at a constant temperature was an important contributor to the noise in the system. In order to minimize the contribution that the control system makes to the noise in the calorimeter response, a new control system for the calorimeter has been developed. An experimental and analytical study has been performed to determine the effectiveness of this new control system in reducing the response noise in a Wheatstone bridge calorimeter. The results of this study are presented along with their implications for future work in minimizing the equilibrium noise of calorimeters.

  1. CMS Forward Calorimeters Phase II Upgrade

    International Nuclear Information System (INIS)

    The Phase II Upgrade of the CMS forward calorimeters (electromagnetic and hadronic) originates from the fact that these calorimeters will not be sufficiently performant with the expected HL-LHC (High Luminosity LHC) conditions. The major challenge is to preserve/improve the high performance of the current forward detectors with new devices that can withstand the unprecedented radiation levels and disentangle the very large event pileup. Here, we present an overview of the various upgrade options being considered by CMS, explaining the detector concepts and current/future beam test activities

  2. HARP: high pressure argon readout for calorimeters

    International Nuclear Information System (INIS)

    Steel tubes of approximately 8 mm O.D., filled with Argon gas to approx.200 bar, are considered as the active element for a charge collecting sampling calorimeter readout system. The tubes are permanently sealed and operated in the ion chamber mode, with the charge collection on a one-millimeter concentric anode. We present the motivation for such a device, including Monte Carlo predictions of performance. The method of construction and signal collection are discussed, with initial results on leakage and ageing of the filling gas. A prototype electromagnetic calorimeter is described

  3. 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, ...

  4. Contribution to the electromagnetic calorimeter calibration of the LHCb detector- Sensibility to the measurement of the angle βeff in the decay Bd0 → J/ψπ0 and of the angle χ in the decay Bs0→J/ψη

    International Nuclear Information System (INIS)

    LHCb has been designed in order to perform precise measurements of CP violation and rare decays with B mesons. At the LHC start-up, one of the first tasks will be to check the expected apparatus performances. This thesis looks to the first recorded data by the LHCb experiment for two of the subjects developed: the photon reconstruction in the electromagnetic calorimeter assuming different experimental situations, and the calibration of the calorimeter. A photon identification tool is developed based on a Fisher discriminant method using informations from all the calorimeter sub-detectors (SPD, PS, ECAL, HCAL). The reconstructed photons are used for π0 mass reconstruction parameters, able to evaluate the overall calibration level. For individual cell calibration, the constraint from the reconstructed π0 mass is used. A 1% calibration can be achieved even starting from a 30% spread cell to cell calibration within a few tenth hours at the LHCb nominal luminosity. Two physics channels, for which the calorimeter calibration and neutral mesons decaying into photon pair reconstruction are key points, are studied. The channel Bd0 →p J/ψπ to measure β angle, where unexpected contributions beyond the standard model may occur. The channel Bs0 → J/ψη measures the χ angle. (author)

  5. The ALICE cavern and solenoid

    CERN Multimedia

    Maximilien Brice

    2003-01-01

    The ALICE experiment, one of the four major experiments of CERN's LHC project, will be housed in the cavern that once contained the L3 experiment at the LEP accelerator. The huge solenoid is the only remaining piece of the L3 experiment and will be used by ALICE.

  6. The ALICE Forward Multiplicity Detector

    CERN Document Server

    Christensen, Christian Holm; Gulbrandsen, Kristjan; Nielsen, Borge Svane; Sogaard, Carsten

    2007-01-01

    The ALICE Forward Multiplicity Detector (FMD) is a silicon strip detector with 51,200 strips arranged in 5 rings, covering the range $-3.4 < \\eta < 5.1$. It is placed around the beam pipe at small angles to extend the charged particle acceptance of ALICE into the forward regions, not covered by the central barrel detectors.

  7. The ALICE forward multiplicity detector

    DEFF Research Database (Denmark)

    Holm Christensen, Christian; Gulbrandsen, Kristjan; Sogaard, Carsten;

    2007-01-01

    The ALICE Forward Multiplicity Detector (FMD) is a silicon strip detector with 51,200 strips arranged in 5 rings, covering the range $-3.4......The ALICE Forward Multiplicity Detector (FMD) is a silicon strip detector with 51,200 strips arranged in 5 rings, covering the range $-3.4...

  8. 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...

  9. ALICE honours two Italian suppliers

    CERN Document Server

    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...

  10. 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.

  11. Alice Munro: A Bibliography

    OpenAIRE

    Bigot, Corinne

    2014-01-01

    I. Collections of short stories by Alice Munro Dance of the Happy Shades, Toronto, Ryerson Press, 1968, 224 pp; New York, McGraw Hill, 1973, 224 pp; London, Allen Lane, 1974, 224 pp. Lives of Girls and Women, Toronto, McGraw Hill Ryerson, 1971, 254 pp; New York,McGraw Hill, 1972, 250 pp; London, Allen Lane, 1974, 250 pp. Something I’ve Been Meaning To Tell You, Toronto and New York, McGraw-Hill Ryerson, 1974, 246 pp. Who Do You Think You Are?, Toronto, Macmillan, 1974, 206 pp. Printed in the ...

  12. 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.

  13. 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

  14. Quality assurance of CsI(Tl) crystals for the BABAR electromagnetic calorimeter, and a Monte Carlo study of the CP-violating channel B0 → π+π-π0 for the BABAR detector

    International Nuclear Information System (INIS)

    The BABAR high energy physics experiment has been designed to study CP violation in the neutral B meson system. Data-taking began at the PEP-II asymmetric e+e- collider in Spring 1999. The B-physics program for BABAR involves the reconstruction of the wide range of exclusive final states needed for CP studies. This places stringent requirements on the performance of the detector. Since many of the modes of interest include π0 s, it is essential to achieve excellent energy and position resolution for the CsI(Tl) electromagnetic calorimeter. CsI(Tl) crystals for the BABAR electromagnetic calorimeter were supplied by several manufacturing companies. Collaborative work was undertaken with one of these companies, Hilger Crystal Materials, to ensure that the crystals met the high specifications required by BABAR. A new production process was established in order to generate the large size and number of CsI(Tl) crystals needed. The resulting change of scale (larger furnaces, extended growth/cooling periods, increased mass/material handling) presented considerable challenges for all aspects of the production environment in order to achieve the necessary production rate and quality of crystals. The existing working practices were assessed and redesigned to suite the BABAR crystal production. A new purpose-built quality assurance (QA) testing laboratory at Hilger was created, where the trapezoidal crystals were to be precisely dimensioned, tuned for light output, and wrapped. Specialised QA instrumentation was needed for BABAR crystals, and this was built locally, based on a design from SLAC. The operational procedures for quality assurance were established, and new staff were trained in these procedures. The unique characteristics of Hilger crystals required the careful design of tuning methods to optimise light uniformity and overall light yield. Detailed studies of factors affecting crystal properties were carried out, including effects of furnace temperature gradients

  15. Update on the Hadron calorimeter of the CMS Experiment at CERN.

    CERN Document Server

    Hagopian, Vasken

    2008-01-01

    The construction and assembly of the Hadron Calorimeter is now complete and commissioning is almost done. The hadron calorimeter inside the CMS detector is made of scintillator and copper absorber covering the |η| range of 0.0 to 3.0. The forward calorimeter, made of quartz fibers and iron absorber, covers the |η| range of 3.0 to 5.0. Recent test beam effort is aimed at understanding of the performance of the Hadron Calorimeter in conjunction with the lead tungstate crystal Electromagnetic Calorimeter. Recent test beam results using production modules help us improve resolution. Work has started on several upgrade fronts for the high luminosity LHC.

  16. Experimental search of the electroweak symmetry breaking in the H→γγ channel and of a solution to the hierarchy problem in ATLAS. Participation to the preparation of the electronics of the electromagnetic calorimeter

    International Nuclear Information System (INIS)

    This thesis deals with the understanding of the spontaneous electroweak symmetry breaking mechanism in the ATLAS experiment at LHC collider, by studying two complementary topics: the search for the Higgs boson in the H→γγ channel, and a search for extra dimensions in the gluon sector. Tests of the electronic of the electromagnetic calorimeter allowed to validate various cards that were under the responsibility of the LPNHE. Using full simulation data of the detector allowed us to precisely compute mass resolution of the di-photon system. Due to recent theoretical improvements, signal and background have been studied at the next order of the perturbative development, which increases cross-sections. With regards to the jet background, a study has been done using discriminating variables in order to obtain, for a 80 % photons efficiency, a rejection factor of 7000. The discovery potential benefits from this change of cross-sections and increases by 50 % in comparison with the same analysis done at the leading order. In addition to this, a new analysis using a maximum likelihood method allowed us to increase by 40 % the discovery potential in comparison with our classical analysis. In conclusion, the Higgs boson of 120 GeV/c2 can be now discovered in this channel with an integrated luminosity of 10 fb-1. Furthermore, naturality problem of the Higgs boson mass can be solved by introducing extra dimensions in which gluons can propagate. We have shown that it was possible to discover extra-dimensions up to a compactification scale of 15 TeV. (author)

  17. Experiment search of the electroweak symmetry breaking in the H → γγ channel and of a solution of the hierarchy problem in the Atlas experiment: participation to the tests of the electronics of the electromagnetic calorimeter

    International Nuclear Information System (INIS)

    This thesis deals with the understanding of the spontaneous electroweak symmetry breaking mechanism in the ATLAS experiment at LHC collider, by studying two complementary topics: the search for the Higgs boson in the H → γγ channel, and a search for extra dimensions in the gluon sector. Tests of the electronic of the electromagnetic calorimeter allowed us to validate various cards that were under the responsibility of the LPNHE. Using full simulation data of the detector allowed us to precisely compute mass resolution of the di-photon system. Due to recent theoretical improvements, signal and background have been studied at the next order of the perturbative development, which increases cross-sections. With regards to the jet background, a study has been done using discriminating variables in order to obtain, for a 80 % photons efficiency, a rejection factor of 7000. The discovery potential benefits from this change of cross-sections and increases by 50 % in comparison with the same analysis done at the leading order. In addition to this, a new analysis using a maximum likelihood method allowed us to increase by 40 % the discovery potential in comparison with our classical analysis. In conclusion, the Higgs boson of 120 GeV/c2 can be now discovered in this channel with an integrated luminosity of 10 fb-1. Furthermore, the consistency of the problem of the Higgs boson mass can be solved by introducing extra dimensions in which gluons can propagate. We have shown that it was possible to discover extra-dimensions up to a compactification scale of 15 TeV. (author)

  18. Time alignment of the electromagnetic and hadronic calorimeters, reconstruction of the B → D-ρ(770)+, Bs → Ds-ρ(770)+ and Bs → Ds- K*+(892) decay channels with the LHCb detector

    International Nuclear Information System (INIS)

    This thesis has been performed in the framework of the LHCb experiment installed on the LHC proton-proton collider at CERN. First, we have developed an asymmetry-based method to time align both the electromagnetic (ECAL) and hadronic (HCAL) calorimeters. We have shown that with 450 GeV beams and without the magnetic field 55000 minimum bias events are necessary to time align, with a precision of 0.5 ns, 84% of the ECAL cells and 96% of the HCAL cells. During the commissioning we have analyzed over a million cosmic events and checked that the internal time alignment of the ECAL and HCAL is better than 1 ns. We have adjusted the relative time alignment between the ECAL and the HCAL to 2 ns. On 10. of September 2008, the LHC delivered one hour of beam. The interaction between a collimator located upstream of LHCb and the beam leads to the production of hadronic showers, detected in the HCAL. We have shown that the global time alignment of the HCAL and the LHC clocks is about 0.8 ns. We have studied the Bd → D-ρ(770)+, Bs → Ds- ρ(770)+ and Bs → Ds-K*+(892) decay modes. All three modes have a neutral pion in the final state. We developed a method that selects signal events and minimizes the bb-bar background. With a nominal year of data, we expect 450000 events for the Bd → D- ρ(770)+ mode, 71000 events for the Bs → Ds- ρ(770)+ mode and 1300 events for the Bs → Ds-K*+(892) mode, with a background over signal fraction varying between 1.6 and 6. (author)

  19. The ATLAS Forward Calorimeter

    Science.gov (United States)

    Artamonov, A.; Bailey, D.; Belanger, G.; Cadabeschi, M.; Chen, T.-Y.; Epshteyn, V.; Gorbounov, P.; Joo, K. K.; Khakzad, M.; Khovanskiy, V.; Krieger, P.; Loch, P.; Mayer, J.; Neuheimer, E.; Oakham, F. G.; O'Neill, M.; Orr, R. S.; Qi, M.; Rutherfoord, J.; Savine, A.; Schram, M.; Shatalov, P.; Shaver, L.; Shupe, M.; Stairs, G.; Strickland, V.; Tompkins, D.; Tsukerman, I.; Vincent, K.

    2008-02-01

    Forward calorimeters, located near the incident beams, complete the nearly 4π coverage for high pT particles resulting from proton-proton collisions in the ATLAS detector at the Large Hadron Collider at CERN. Both the technology and the deployment of the forward calorimeters in ATLAS are novel. The liquid argon rod/tube electrode structure for the forward calorimeters was invented specifically for applications in high rate environments. The placement of the forward calorimeters adjacent to the other calorimeters relatively close to the interaction point provides several advantages including nearly seamless calorimetry and natural shielding for the muon system. The forward calorimeter performance requirements are driven by events with missing ET and tagging jets.

  20. 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...

  1. The Latest from ALICE

    CERN Multimedia

    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...

  2. Protecting Detectors in ALICE

    CERN Document Server

    Mateusz Lechman, Mateusz; Chochula, Peter; Di Mauro, Antonio; Jirden, Lennart Stig; Schindler, Heinrich; Rosinsky, Peter; Moreno, Alberto; Kurepin, Alexander; Pinazza, Ombretta; De Cataldo, Giacinto

    2011-01-01

    ALICE (A Large Ion Collider Experiment) is one of the big LHC (Large Hadron Collider) experiments at CERN in Geneva. It is composed of many sophisticated and complex detectors mounted very compactly around the beam pipe. Each detector is a unique masterpiece of design, engineering and construction and any damage to it could stop the experiment for months or even for years. It is therefore essential that the detectors are protected from any danger and this is one very important role of the Detector Control System (DCS). One of the main dangers for the detectors is the particle beam itself. Since the detectors are designed to be extremely sensitive to particles they are also vulnerable to any excess of beam conditions provided by the LHC accelerator. The beam protection consists of a combination of hardware interlocks and control software and this paper will describe how this is implemented and handled in ALICE. Tools have also been developed to support operators and shift leaders in the decision making related...

  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 CMS electromagnetic calorimeter for the Higgs boson search H {yields} ZZ{sup *} {yields} 4e at the LHC; Le calorimetre electromagnetique de CMS pour la recherche du boson de higgs, H {yields} ZZ{sup *} {yields} 4e au LHC

    Energy Technology Data Exchange (ETDEWEB)

    Ferri, F

    2006-01-15

    The work presented in this thesis has focused on the electromagnetic calorimeter (ECAL) of the CMS (Compact Muon Solenoid) detector and on its relevance in the discovery of the Higgs boson in the channel H {yields} ZZ{sup *} {yields} 4e, for which the performance of ECAL is essential. The calorimeter has been studied in detail with test beam data and with simulated data using a complete description of the CMS detector. The test beam studies have been directed to the analysis of the electronic noise and to the amplitude reconstruction of the signal acquired from the calorimeter. A procedure to evaluate the spectral power density of the signals has been determined using the maximum entropy method. Using the full CMS detector simulation, a detailed study of the electron reconstruction inside CMS has pointed out the problems which affect the measurements of the electron energy with the calorimeter. A particular case has been given to electrons of low transverse momentum (p{sub T} < 30 GeV/c) for which these effects are crucial. Namely the Bremsstrahlung effect, which is due to the tracking material in front of the calorimeter and constitutes the major problem, has been examined in depth. These results have been applied in the analysis of the Higgs boson signal in the channel H {yields} ZZ{sup *} {yields} 4e, where the electron and positron coming from the Z with the lowest mass have typically low transverse momentum. A neural network analysis extended to mass points ranging from 115 GeV/c{sup 2} shows that a discovery claim could be made in this channel for Higgs masses between 130 GeV/c{sup 2} and 145 GeV/c{sup 2} and greater than 185 GeV/c{sup 2}. (A.C.)

  5. Design, Performance and Calibration of the CMS Forward Calorimeter Wedges

    CERN Document Server

    Baiatian, G; Emeliantchik, Igor; Massolov, V; Shumeiko, Nikolai; Stefanovich, R; Damgov, Jordan; Dimitrov, Lubomir; Genchev, Vladimir; Piperov, Stefan; Vankov, Ivan; Litov, Leander; Bencze, Gyorgy; Laszlo, Andras; Pal, Andras; Vesztergombi, Gyorgy; Zálán, Peter; Fenyvesi, Andras; Bawa, Harinder Singh; Beri, Suman Bala; Bhatnager, V; Kaur, Manjit; Kumar, Arun; Kohli, Jatinder Mohan; Singh, Jas Bir; Acharya, Bannaje Sripathi; Chendvankar, Sanjay; Dugad, Shashikant; Kalmani, Suresh Devendrappa; Katta, S; Mazumdar, Kajari; Mondal, Naba Kumar; Nagaraj, P; Patil, Mandakini Ravindra; Reddy, L V; Satyanarayana, B; Sharma, Seema; Verma, Piyush; Hashemi, Majid; Mohammadi-Najafabadi, M; Paktinat, S; Babich, Kanstantsin; Golutvin, Igor; Kalagin, Vladimir; Kosarev, Ivan; Ladygin, Vladimir; Meshcheryakov, Gleb; Moissenz, P; Petrosian, A; Rogalev, Evgueni; Sergeyev, S; Smirnov, Vitaly; Vishnevski, A V; Volodko, Anton; Zarubin, Anatoli; Gavrilov, Vladimir; Gershtein, Yuri; Ilyina, N P; Kaftanov, Vitali; Kisselevich, I; Kolossov, V; Krokhotin, Andrey; Kuleshov, Sergey; Litvintsev, Dmitri; Oulyanov, A; Safronov, S; Semenov, Sergey; Stolin, Viatcheslav; Gribushin, Andrey; Demianov, A; Kodolova, Olga; Petrushanko, Sergey; Sarycheva, Ludmila; Teplov, Konstantin; Vardanyan, Irina; Yershov, A A; Abramov, Victor; Goncharov, Petr; Kalinin, Alexey; Korablev, Andrey; Khmelnikov, V A; Korneev, Yury; Krinitsyn, Alexander; Kryshkin, V; Lukanin, Vladimir; Pikalov, Vladimir; Ryazanov, Anton; Talov, Vladimir; Turchanovich, L K; Volkov, Alexey; Camporesi, Tiziano; De Visser, Theo; Vlassov, E; Aydin, Sezgin; Bakirci, Mustafa Numan; Cerci, Salim; Dumanoglu, Isa; Eskut, Eda; Kayis-Topaksu, A; Koylu, S; Kurt, Pelin; Kuzucu, A; Onengüt, G; Ozdes-Koca, N; Ozkurt, Halil; Sogut, Kenan; Topakli, Huseyin; Vergili, Mehmet; Yetkin, Taylan; Cankocak, Kerem; Gamsizkan, Halil; Ozkan, Cigdem; Sekmen, Sezen; Serin-Zeyrek, M; Sever, Ramazan; Yazgan, Efe; Zeyrek, Mehmet; Deliomeroglu, Mehmet; Dindar, Kamile; Gülmez, Erhan; Isiksal, Engin; Kaya, Mithat; Ozkorucuklu, Suat; Levchuk, Leonid; Sorokin, Pavel; Grinev, B; Lubinsky, V; Senchyshyn, Vitaliy; Anderson, E Walter; Hauptman, John M; Elias, John E; Freeman, Jim; Green, Dan; Heering, Arjan Hendrix; Lazic, Dragoslav; Los, Serguei; Ronzhin, Anatoly; Suzuki, Ichiro; Vidal, Richard; Whitmore, Juliana; Antchev, Georgy; Arcidy, M; Hazen, Eric; Lawlor, C; Machado, Emanuel; Posch, C; Rohlf, James; Sulak, Lawrence; Varela, F; Wu, Shouxiang; Adams, Mark Raymond; Burchesky, Kyle; Qiang, W; Abdullin, Salavat; Baden, Drew; Bard, Robert; Eno, Sarah Catherine; Grassi, Tullio; Jarvis, Chad; Kellogg, Richard G; Kunori, Shuichi; Mans, Jeremy; Skuja, Andris; Wang, Lei; Wetstein, Matthew; Ayan, S; Akgun, Ugur; Duru, Firdevs; Merlo, Jean-Pierre; Mestvirishvili, Alexi; Miller, Michael; Norbeck, Edwin; Olson, Jonathan; Onel, Yasar; Schmidt, Ianos; Akchurin, Nural; Carrell, Kenneth Wayne; Gumus, Kazim; Kim, Heejong; Spezziga, Mario; Thomas, Ray; Wigmans, Richard; Baarmand, Marc M; Mermerkaya, Hamit; Vodopyanov, I; Kramer, Laird; Linn, Stephan; Markowitz, Pete; Martínez, German; Cushman, Priscilla; Ma, Yousi; Sherwood, Brian; Cremaldi, Lucien Marcus; Reidy, Jim; Sanders, David A; Fisher, Wade Cameron; Tully, Christopher; Hagopian, Sharon; Hagopian, Vasken; Johnson, Kurtis F; Barnes, Virgil E; Laasanen, Alvin T; Pompos, Arnold

    2008-01-01

    We report on the test beam results and calibration methods using charged particles of the CMS Forward Calorimeter (HF). The HF calorimeter covers a large pseudorapidity region (3\\l |\\eta| \\le 5), and is essential for large number of physics channels with missing transverse energy. It is also expected to play a prominent role in the measurement of forward tagging jets in weak boson fusion channels. The HF calorimeter is based on steel absorber with embedded fused-silica-core optical fibers where Cherenkov radiation forms the basis of signal generation. Thus, the detector is essentially sensitive only to the electromagnetic shower core and is highly non-compensating (e/h \\approx 5). This feature is also manifest in narrow and relatively short showers compared to similar calorimeters based on ionization. The choice of fused-silica optical fibers as active material is dictated by its exceptional radiation hardness. The electromagnetic energy resolution is dominated by photoelectron statistics and can be expressed...

  6. ATLAS LAr calorimeter degradation studies for HL-LHC

    Energy Technology Data Exchange (ETDEWEB)

    Novgorodova, Olga [Institut fuer Kern- und Teilchenphysik, Dresden (Germany)

    2015-07-01

    The future High Luminosity LHC upgrade (HL-LHC) will increase the luminosity by a factor of ten, which implies radiation hardness requirements for the LHC detectors. This requires to test the ATLAS Liquid Argon (LAr) calorimeters for higher intensities. In several test beam campaigns at IHEP/Protvino, the HiLum collaboration investigated small-size modules of the electromagnetic, hadronic, and forward calorimeters. The intensity of beam varied over a wide range (10{sup 6} to 10{sup 12} p/s) and beyond the maximum expected at HL-LHC for these calorimeters. The correlation between beam intensity and the electromagnetic calorimeter HV current signal is used to quantify the possible signal degradation. The results of the detector performance before and after operation in highest beam intensities are presented.

  7. The spaghetti calorimeter. Research, development, application

    Energy Technology Data Exchange (ETDEWEB)

    Scheel, C.V.

    1994-12-22

    The Spaghetti Calorimeter (SPACAL) is a detector intended primarily for the energy measurement of high-energy particles, but also provides spatial information and particle identification. It is a sampling calorimeter composed of plastic scintillating fibers, oriented in the direction of the particle, embedded in lead. The scintillation light is read out by photomultipliers, which are coupled to bunches of fibers through light guides, each forming a tower. It was developed as an electromagnetic (e.m.) and compensating hadronic calorimeter for use in future multi-TeV collider experiments. The largest prototype was installed for an alternative application as an hadronic calorimeter in the WA89 experiment, where it is used for the detection of neutrons resulting from {Sigma} decays. The basic concepts behind calorimetry are discussed in detail. Several prototypes were tested in beams of electrons and pions with energies up to 150 GeV. Resonable e.m. energy resolution, at {sigma}/E=12.9%/{radical}E[GeV]+1.23%, was measured. Excellent hadronic energy resolution was found, at 30.6%/{radical}E[GeV]+1.0%, but the calorimeter was found to be slightly undercompensating with e/h=1.15. The position of the shower barycenter for both electrons and pions was easily found according to the relative energy deposits in the calorimeter towers. The calorimeter was also found to be able to provide effective discrimination between electrons and hadrons. The performance of SPACAL in the WA89 experiment at the Omega spectrometer at CERN was studied with the reconstruction of beam {Sigma}{sup -}particles via its decay {Sigma}{sup -}{yields}n{pi}{sup -}. Details of the calibration of SPACAL with electrons and protons are presented. (orig.).

  8. The spaghetti calorimeter. Research, development, application

    International Nuclear Information System (INIS)

    The Spaghetti Calorimeter (SPACAL) is a detector intended primarily for the energy measurement of high-energy particles, but also provides spatial information and particle identification. It is a sampling calorimeter composed of plastic scintillating fibers, oriented in the direction of the particle, embedded in lead. The scintillation light is read out by photomultipliers, which are coupled to bunches of fibers through light guides, each forming a tower. It was developed as an electromagnetic (e.m.) and compensating hadronic calorimeter for use in future multi-TeV collider experiments. The largest prototype was installed for an alternative application as an hadronic calorimeter in the WA89 experiment, where it is used for the detection of neutrons resulting from Σ decays. The basic concepts behind calorimetry are discussed in detail. Several prototypes were tested in beams of electrons and pions with energies up to 150 GeV. Resonable e.m. energy resolution, at σ/E=12.9%/√E[GeV]+1.23%, was measured. Excellent hadronic energy resolution was found, at 30.6%/√E[GeV]+1.0%, but the calorimeter was found to be slightly undercompensating with e/h=1.15. The position of the shower barycenter for both electrons and pions was easily found according to the relative energy deposits in the calorimeter towers. The calorimeter was also found to be able to provide effective discrimination between electrons and hadrons. The performance of SPACAL in the WA89 experiment at the Omega spectrometer at CERN was studied with the reconstruction of beam Σ-particles via its decay Σ-→nπ-. Details of the calibration of SPACAL with electrons and protons are presented. (orig.)

  9. Closing LHCb's calorimeter around the beam-pipe

    CERN Multimedia

    Kristic, R

    2008-01-01

    Photos 1 and 2 show the pre-shower, lead absorber and the scintillating pad detector layers moving in towards the beam-pipe. Photos 3,4 and 5 show the hadron calorimeter with both halves closed around the beam-pipe, to the left of the picture and, in the centre, half of the electromagnetic calorimeter closed in towards the beam-pipe.

  10. Visualizing and Understanding Atlas Calorimeters with Atlantis

    International Nuclear Information System (INIS)

    We describe tools that have been developed for the visualization and understanding of the hadronic and electromagnetic calorimeters of the Atlas experiment with the event visualization program Atlantis. The event data is extracted into XML format by dedicated algorithms running within the Atlas Software framework Athena, and read into Atlantis directly from physical data files or via a server/client-setup. For the Atlas Calorimeters commissioning, code was developed to create XML-data with detailed calorimeter information, like the electronic pulse shapes, calibration factors and cell identifiers. All this information is displayed in Atlantis through tools developed for this purpose. With these new features, the user has access to the reconstructed and raw data in the same place, and can check for example the consistency of the reconstruction. It allows easy identification of problematic calorimeter cells, e.g. high noise or dead cells, and also allows one to compare digital data from calorimeter and trigger channels, and was used during the Atlas detector commissioning in 2008 and 2009.

  11. LHCb Calorimeter modules arrive at CERN

    CERN Multimedia

    2002-01-01

    Two of the three components of the LHCb Calorimeter system have started to arrive from Russia. Members of the LHCb Calorimeter group with the ECAL and HCAL modules that have just arrived at CERN. The first two of the 56 Hadron Calorimeter (HCAL) modules and 1200 of the 3300 modules of the Electromagnetic Calorimeter (ECAL) have reached CERN from Russia. The third part of the system, the Preshower detector, is still being prepared in Russia. The calorimeter system identifies and triggers on high-energy particles, namely electrons, hadrons and photons by measuring their positions and energies. The HCAL is going to be a pure trigger device. The ECAL will also be used in the triggering, but in addition it will reconstruct neutral pions and photons from B meson decays. One of the major aims of the LHCb experiment is to study CP violation through B meson decays including Bs mesons with high statistics in different decay modes. CP violation (violation of charge and parity) is necessary to explain why the Universe...

  12. Cooling in the ALICE detector

    OpenAIRE

    Almén, Ylva

    2015-01-01

    At CERN, the European Laboratory for Particle Physics in Geneva, Switzerland, a new modern particle accelerator called the LHC, Large Hadron Collider, is being projected. One of the four large detectors of the LHC, ALICE, consists of many sub-detectors. Temperature stability in ALICE is of great importance for the experiments performed here.  In the ALICE sub-detector TPC, Time Projection Chamber, there is a great risk for thermal instability.  This will cause false data in the experiments, a...

  13. 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).

  14. 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.

  15. The Electromagentic Barrel Calorimeter for the GlueX Experiment

    CERN Document Server

    Barbi, M

    2006-01-01

    The electromagnetic barrel calorimeter is one of the main components of the planned GlueX experiment. It will consist of 48 modules made of consecutive layers of 4 m long lead sheet and fast green scintillator fibers for an overall number of approximately 3000 readout channels with silicon photomultiplier-based photo-sensors for light collection. The calorimeter is expected to achieve energy and time resolution better than 5%/sqrt(E)+2% and 200 ps, respectively. In this contribution we present an overview of the calorimeter design and some preliminary studies of its performance using Monte Carlo simulations and beam test measurements.

  16. Full Jet Reconstruction in 2.76 TeV pp and Pb-Pb collisions in the ALICE experiment

    CERN Document Server

    Reed, Rosi

    2013-01-01

    Measurements of the suppression of high-pT particles and the away-side jets from heavy-ion collisions at RHIC have shown that medium-induced energy loss affects partons produced in the early stage of a heavy-ion collision. At LHC energies the initial production cross-section is much higher, which allows jets to be reconstructed with a wide kinematic range. Measuring fully reconstructed jets by taking advantage of the ALICE Electromagnetic Calorimeter allows for a more differential investigation of the parton energy loss. Parton energy loss will allow us to access key observables of the hot, dense matter created in heavy ion collisions. The data presented was collected during the 2.76 TeV Pb-Pb runs, as well as baseline measurements from the 2.76 TeV pp run. The procedures used to reconstruct jets and extract them from a fluctuating background will be discussed. The procedure for quantifying the background with a limited acceptance will also be discussed. These results are compared to pp measurements and simul...

  17. 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...

  18. ELECTROMAGNETIC COMPATIBILITY OF A DC POWER DISTRIBUTION SYSTEM FOR THE ATLAS LIQUID ARGON CALORIMETER COMPATIBILIDAD ELECTROMAGNÉTICA EN EL SISTEMA DE DISTRIBUCIÓN DE CORRIENTE CONTINUA PARA EL CALORÍMETRO DE ARGÓN LÍQUIDO EN ATLAS

    OpenAIRE

    George Blanchot; Luis Hervas; Jim Kierstead; Francesco Lanni; Sergio Rescia(Brookhaven National Lab); Mauricio Verdugo; Jorge Pontt; Ricardo Olivares; Hernán Robles; Sergio Díaz

    2008-01-01

    The front-end electronics of the ATLAS Liquid Argon Calorimeter is powered by DC/DC converters nearby the front-end crates. They are fed by AC/DC converters located in a remote control room through long power cables. The stability of the power distribution scheme is compromised by the impedance of the long interconnection cable, and proper matching of the converters dynamic impedances is required. Also, the long power cable fed by a powerful AC/DC converter is a source of electromagnetic inte...

  19. First Physics Results from ALICE

    International Nuclear Information System (INIS)

    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 √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)

  20. 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...

  1. AIDA: concerted calorimeter development

    CERN Multimedia

    Felix Sefkow

    2013-01-01

    AIDA – the EU-funded project bringing together more than 80 institutes worldwide – aims at developing new detector solutions for future accelerators. Among the highlights reported at AIDA’s recent annual meeting in Frascati was the completion of an impressive calorimeter test beam programme, conducted by the CALICE collaboration over the past two years at CERN’s PS and SPS beam lines.   The CALICE tungsten calorimeter prototype under test at CERN. This cubic-metre hadron calorimeter prototype has almost 500,000 individually read-out electronics channels – more than all the calorimeters of ATLAS and CMS put together. Calorimeter development in AIDA is mainly motivated by experiments at possible future electron-positron colliders, namely ILC or CLIC. The physics requirements of such future machines demand extremely high-performance calorimetry. This is best achieved using a finely segmented system that reconstructs events using the so-called pa...

  2. Preparing the ALICE DAQ upgrade

    Science.gov (United States)

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

    2012-12-01

    In November 2009, after 15 years of design and installation, the ALICE experiment started to detect and record the first collisions produced by the LHC. It has been collecting hundreds of millions of events ever since with both proton and heavy ion collisions. The future scientific programme of ALICE has been refined following the first year of data taking. The physics targeted beyond 2018 will be the study of rare signals. Several detectors will be upgraded, modified, or replaced to prepare ALICE for future physics challenges. An upgrade of the triggering and readout systems is also required to accommodate the needs of the upgraded ALICE and to better select the data of the rare physics channels. The ALICE upgrade will have major implications in the detector electronics and controls, data acquisition, event triggering and offline computing and storage systems. Moreover, the experience accumulated during more than two years of operation has also lead to new requirements for the control software. We will review all these new needs and the current R&D activities to address them. Several papers of the same conference present in more details some elements of the ALICE online system.

  3. Summary of the liquid argon calorimeter hermeticity working group

    International Nuclear Information System (INIS)

    The cryogenic nature, and hence the need to provide thermal insulation, of liquid argon calorimeters is known to pose serious problems for precise measurements of missing transverse energy, a key signature for new physics at the SSC. This problem is exacerbated by the central detector requirement of access to both sides of the detector. The original DiGiacomo et al. design sought to satisfy this access requirement and still minimize the effect of electromagnetic showers by protruding the end cap calorimeter into the central volume. This design was compared with two design variations by using a parameterization of hadronic and electromagnetic showers assuming no transverse width. These authors concluded that a flat head End Cap design was preferable to the original design for both electromagnetic and hadronic showers. The practical design advantages of this method was further demonstrated by the conclusions that instrumented calorimeter volumes which are not thick enough to absorb most of an electromagnetic shower before a dead volume enhance the resolution degradation. This means, for instance, that calorimeter modules should have their large eta edge on the front face beveled to decrease the effect of the structural washers separating the calorimeter module bays

  4. Contribution to the study of electromagnetic calorimeter with PbWO{sub 4} crystals in the CMS experiment at LHC; Contribution a l`etude du calorimetre electromagnetique a cristaux de PbWO{sub 4} de l`experience CMS au LHC

    Energy Technology Data Exchange (ETDEWEB)

    Benhammou, Y. [Lyon-1 Univ., 69 (France)

    1997-01-13

    The Higgs bosons can be observed in the [90-130] GeV mass range in the channel h -> {gamma}{gamma} if a high resolution electromagnetic calorimeter is used. The needed performances are met in the Pb W O{sub 4} crystals. This thesis is devoted to the study of the first Pb W O{sub 4} crystals (23 cm length) and their associated electronic equipment. Of crucial importance it was found to be the behaviour of these crystals under long radiation exposure. The understanding of the radiation effects, the crystal growth procedure mastering and the realization of a green light monitoring system of high performance were successful results obtained in the study described in this thesis. A rather high energy (0.6 % at 100 GeV) and position resolution was achieved by using a APD readout. In addition, the prototype of a final readout chain of large dynamic range and low consumption was built with very encouraging results. Concerning the APDs it was established that increasing the active surface and reduction of exceeding noise factor F improves significantly the stochastic term in the energy resolution. Besides, a complete readout chain comprising current preamplifiers, a linear compressing (multi-slope) system and a fast ADC (40 MHz), were found necessary to met the requirements imposed on the high performing Pb W O{sub 4} calorimeter. Research and development works based on the pioneering studies described in this thesis devoted to the crystal calorimeters are underway 77 refs.

  5. Hadron showers in a highly granular calorimeter

    Energy Technology Data Exchange (ETDEWEB)

    Lutz, Benjamin

    2010-11-15

    A future electron-positron collider like the planned International Linear Collider (ILC) needs excellent detectors to exploit the full physics potential. Different detector concepts have been evaluated for the ILC and two concepts on the particle-flow approach were validated. To make particle-flow work, a new type of imaging calorimeters is necessary in combination with a high performance tracking system, to be able to track the single particles through the full detector system. These calorimeters require an unprecedented level of both longitudinal and lateral granularity. Several calorimeter technologies promise to reach the required readout segmentation and are currently studied. This thesis addresses one of these: The analogue hadron calorimeter technology. It combines work on the technological aspects of a highly granular calorimeter with the study of hadron shower physics. The analogue hadron calorimeter technology joins a classical scintillator-steel sandwich design with a modern photo-sensor technology, the silicon photomultiplier (SiPM). The SiPM is a millimetre sized, magnetic field insensitive, and low cost photo-sensor, that opens new possibilities in calorimeter design. This thesis outlines the working principle and characteristics of these devices. The requirements for an application specific integrated circuit (ASIC) to read the SiPM are discussed; the performance of a prototype chip for SiPM readout, the SPIROC, is quantified. Also the SiPM specific reconstruction of a multi-thousand channel prototype calorimeter, the CALICE AHCAL, is explained; the systematic uncertainty of the calibration method is derived. The AHCAL does not only offer a test of the calorimeter technology, it also allows to record hadron showers with an unprecedented level of details. Test-beam measurements have been performed with the AHCAL and provide a unique sample for the development of novel analysis techniques and the validation of hadron shower simulations. A method to

  6. Hadron showers in a highly granular calorimeter

    International Nuclear Information System (INIS)

    A future electron-positron collider like the planned International Linear Collider (ILC) needs excellent detectors to exploit the full physics potential. Different detector concepts have been evaluated for the ILC and two concepts on the particle-flow approach were validated. To make particle-flow work, a new type of imaging calorimeters is necessary in combination with a high performance tracking system, to be able to track the single particles through the full detector system. These calorimeters require an unprecedented level of both longitudinal and lateral granularity. Several calorimeter technologies promise to reach the required readout segmentation and are currently studied. This thesis addresses one of these: The analogue hadron calorimeter technology. It combines work on the technological aspects of a highly granular calorimeter with the study of hadron shower physics. The analogue hadron calorimeter technology joins a classical scintillator-steel sandwich design with a modern photo-sensor technology, the silicon photomultiplier (SiPM). The SiPM is a millimetre sized, magnetic field insensitive, and low cost photo-sensor, that opens new possibilities in calorimeter design. This thesis outlines the working principle and characteristics of these devices. The requirements for an application specific integrated circuit (ASIC) to read the SiPM are discussed; the performance of a prototype chip for SiPM readout, the SPIROC, is quantified. Also the SiPM specific reconstruction of a multi-thousand channel prototype calorimeter, the CALICE AHCAL, is explained; the systematic uncertainty of the calibration method is derived. The AHCAL does not only offer a test of the calorimeter technology, it also allows to record hadron showers with an unprecedented level of details. Test-beam measurements have been performed with the AHCAL and provide a unique sample for the development of novel analysis techniques and the validation of hadron shower simulations. A method to

  7. International workshop on calorimeter simulation

    International Nuclear Information System (INIS)

    The aim of the Juelich workshop was to provide an overview of the state of calorimeter simulation and the methods used. This resulted in 29 contributions to the following topics: Code systems relevant to calorimeter simulation, vectorization and code speed-up, simulation of calorimeter experiments, special applications of calorimeter simulation. This report presents the viewgraphs of the given talks. (orig./HSI)

  8. Software studies of GLD calorimeter

    Indian Academy of Sciences (India)

    H Matsunaga

    2007-12-01

    The baseline design of the GLD calorimeter is scintillator-strip arrays interleaved with absorber plates. We present preliminary performance studies of the hit clustering with this calorimeter using a simulator. Also, simulation results of a `digital' calorimeter, which is an option of the GLD calorimeter, are presented.

  9. Calibration of the electromagnetic barrel calorimeter. Identification of the tau leptons and search for a Higgs boson in the channel qqH {yields} qq {tau}{tau} in the Atlas experiment at LHC; Etalonnage du calorimetre electromagnetique tonneau. Identification des leptons taus et recherche d'un boson de Higgs dans le canal qqH {yields} qq {tau}{tau} dans l'experience ATLAS au LHC

    Energy Technology Data Exchange (ETDEWEB)

    Tarrade, F

    2006-09-15

    The Standard Model is the theory which describes the fundamental interactions most accurately. However, the Higgs mechanism and its associated boson have not yet been discovered. The ATLAS electromagnetic calorimeter will play an important role in its discovery if it exists. In the first part of this work, a final mapping of all barrel electromagnetic calorimeter cells, and in particular the problematic ones, was made. Then, the code for the calorimeter calibration was migrated into the ATLAS software environment (ATHENA), where it was tested and validated with the 2004 test beam data. In this code, the optimal filtering coefficients, which enable to reconstruct the energy deposited in the calorimeter while minimizing the electronic and pile-up noises, are calculated. For this, a model was developed to predict the physics signal waveform from the calibration waveform. In a third part, two algorithms for reconstructing and identifying {tau} leptons in their hadronic decay mode were studied and compared. Finally in a fourth part, one amongst the most important Standard Model Higgs production and decay channels was investigated, namely the weak boson fusion production followed by the Higgs decay into a tau lepton pair, for a low mass Higgs (115 < m{sub Higgs} < 145 GeV/c{sup 2}). This study was performed for 30 fb{sup -1} of integrated luminosity using fast and fully simulated data. A study of the dominant background Z + n jets (n {<=} 5) was also performed. (author)

  10. LHCb: High Voltage system for the LHCb calorimeter detectors at CERN

    CERN Multimedia

    Konoplyannikov, A

    2006-01-01

    All calorimeters are equipped with Hamamatsu photo tubes as devices for light to signal conversion. Eight thousand R7899-20 tubes are used for the electromagnetic and hadronic calorimeters and two hundred 64 channels multi-anode R7600 -00-M64 for Scintillator-Pad/Preshower detectors. Similar photo-detectors are widely used in the Molecular Imaging applications.

  11. A study of parton fragmentation using photon-hadron correlation with the ALICE experiment at LHC

    International Nuclear Information System (INIS)

    The strong interaction theory, Quantum Chromodynamic (QCD), predicts a new phase of nuclear matter at very high temperature and/or very high density. This state is composed of deconfined quarks and gluons known as the quark-gluon plasma (QGP). The measurement of its composition and properties is a challenge for the nuclear physics of the 21. century and should lead to a better understanding of the fundamental symmetries and mechanisms related to the quarks confinement inside hadrons and the strong interaction generally.The Large Hadron Collider (LHC) accelerator at CERN (European Organization for Nuclear Research) allows to reach the thermodynamic conditions required to create the quark-gluon plasma using ultra-relativistic heavy ion collisions (Pb). The ALICE experiment (A Large Ion Collider Experiment) allows to access several probes to characterize the QGP through particles reconstruction and. Among these probes, high energy parton energy loss is used to access medium characteristics such as density or temperature. Parton energy loss is estimated from the modification of the energy distribution of hadrons produced by fragmentation.This thesis is dedicated to the photon-hadron correlations analysis in order to study the modification of the parton fragmentation due to the quark-gluon plasma. First part of this thesis is devoted to the characterization of the electromagnetic calorimeter (EMCal), the central detector for energy measurement and photon identification. The second part is dedicated to the photon-hadron correlation measurement, for the 7 TeV proton-proton collisions and 2.76 TeV Lead-Lead collisions. An important work has been done to improve the prompt photon identification, one of the key point of this analysis. (author)

  12. 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.

  13. 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.

  14. 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"...

  15. 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,...

  16. The ZEUS uranium calorimeter

    International Nuclear Information System (INIS)

    The uranium-scintillator calorimeter of the ZEUS experiment in the HERA electron proton collider at DESY in Hamburg, Germany, is described. It covers 99.8% of the solid angle, has an energy resolution 35%/√E for single hadrons and jets, and 17.5%/√E for electrons. e/h is 1 within 2% in energy range of 2 to 100 GeV. Test beam results show that inter calibration at the 1% level is achievable using uranium radioactivity. The calorimeter was commissioned in April 1992, and has been taken data since May 1992. Main characteristics of the calorimeter construction, readout, and trigger were reviewed. Experience from the first data taking period, including results on noise, stability of calibration, background from HERA accelerator, and performance of the calorimeter trigger is discussed. (author). 28 refs., 21 figs., 1 tab

  17. GSPEL - Calorimeter Laboratory

    Data.gov (United States)

    Federal Laboratory Consortium — Testing performance claims on heat transfer components The Calorimeter Lab, located in the Ground Systems Power and Energy Lab (GSPEL), is one of the largest in the...

  18. Calorimeters for biotechnology

    International Nuclear Information System (INIS)

    The isothermal and temperature scanning calorimeters manufactured by Calorimetry Sciences Corporation are briefly described. Applications of calorimetry to determine thermodynamics and kinetics of reactions of interest in biotechnology are described with illustrative examples

  19. Calibration of the ZEUS forward calorimeter

    International Nuclear Information System (INIS)

    The physics at the ep-collider HERA requires high resolution calorimetry calibrated with an accuracy of better than 2%. The ZEUS detector meets these conditions by means of a compensating uranium scintillator sandwich calorimeter with an energy resolution of σ/E = 35%/√E + σcal, where σcal is the calibration error. One of the tools to minimize σcal is the calibration with the signals of the radioactivity of the Uranium plates (UNO). Taking UNO data every 8 hours keeps the calibration stable within ≅ 1%. The muon calibration is done employing an algorithm, that determines the most probable energy loss with a precision of ≅ 1%. The channel-to-channel fluctuations of the ratio μ/UNO for a forward calorimeter (FCAL) prototype show a spread of 5.2% for the electromagnetic calorimeter and ≅ 2.5% for the hadronic sections. Improvements in the construction of the FCAL modules decreased these fluctuations to 2.0% and ≅ 1.8% respectively. The influence of the cracks between the calorimeter modules amounts to ≅ 1.7% on average for the ZEUS geometry, if a 2 mm thick Pb-sheet is introduced between the modules. We conclude that we are able to keep σcal below 2%. (orig.)

  20. 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...

  1. Testbeam studies of production modules of the ATLAS Tile Calorimeter

    International Nuclear Information System (INIS)

    We report test beam studies of 11% of the production ATLAS Tile Calorimeter modules. The modules were equipped with production front-end electronics and all the calibration systems planned for the final detector. The studies used muon, electron and hadron beams ranging in energy from 3 to 350 GeV. Two independent studies showed that the light yield of the calorimeter was ∼70pe/GeV, exceeding the design goal by 40%. Electron beams provided a calibration of the modules at the electromagnetic energy scale. Over 200 calorimeter cells the variation of the response was 2.4%. The linearity with energy was also measured. Muon beams provided an intercalibration of the response of all calorimeter cells. The response to muons entering in the ATLAS projective geometry showed an RMS variation of 2.5% for 91 measurements over a range of rapidities and modules. The mean response to hadrons of fixed energy had an RMS variation of 1.4% for the modules and projective angles studied. The response to hadrons normalized to incident beam energy showed an 8% increase between 10 and 350 GeV, fully consistent with expectations for a noncompensating calorimeter. The measured energy resolution for hadrons of σ/E=52.9%/√(E)+5.7% was also consistent with expectations. Other auxiliary studies were made of saturation recovery of the readout system, the time resolution of the calorimeter and the performance of the trigger signals from the calorimeter.

  2. 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

  3. 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 ...

  4. The ALICE forward multiplicity detector

    International Nuclear Information System (INIS)

    The ALICE experiment is designed to study the properties of hadron and nucleus collisions in a new energy regime at the Large Hadron Collider at CERN. A fundamental observable in such collisions is the multiplicity distribution of charged particles. A forward multiplicity detector has been designed to extend the charged particle multiplicity coverage of the ALICE experiment to pseudorapidities of -3.4<η<-1.7 and 1.7<η<5.0. This detector consists of five rings, each containing 10240 Si strips, divided into sectors comprised of Si sensors bonded and glued to hybrid PC boards equipped with radiation hard preamplifiers. The output of these preamplifiers is multiplexed into custom-made fast ADC chips located directly behind the Si sensors on the detector frame. These ADCs are read out, via optical fibers, to a data acquisition farm of commodity PCs. The design and characteristics of the ALICE Forward Multiplicity Detector will be discussed

  5. LHCb: First year of running for the LHCb calorimeter system

    CERN Multimedia

    Guz, Y

    2011-01-01

    The LHCb experiment is dedicated to precision measurements of CP violation and rare decays of B hadrons at the Large Hadron Collider (LHC) at CERN (Geneva) [1, 2]. LHCb is a single-arm spectrometer with a forward angular coverage from approximately 10 mrad to 300 mrad. It comprises a calorimeter system composed of four subdetectors [3]. It selects transverse energy hadron, electron and photon candidates for the first trigger level (L0), which makes a decision 4µs after the interaction. It provides the identification of electrons, photons and hadrons as well as the measurement of their energies and positions. The set of constraints resulting from these functionalities defines the general structure and the main characteristics of the calorimeter system and its associated electronics. A classical structure of an electromagnetic calorimeter (ECAL) followed by a hadron calorimeter (HCAL) has been adopted. In addition the system includes in front of them the Scintillating Pad Detector (SPD) and Pre-Showe...

  6. The Forward Calorimeter of the GlueX Experiment

    Science.gov (United States)

    Bennett, Daniel; GlueX Collaboration

    2013-10-01

    The Forward Calorimeter (FCAL) of the GlueX experiment is a lead glass electromagnetic calorimeter currently being built in Hall D of Jefferson Lab. The GlueX experiment is a photoproduction experiment that will utilize coherent bremsstrahlung radiation to map out the light meson spectrum, including a search for hybrid mesons with exotic quantum numbers (JPC). The FCAL will detect photons between 1° and 10 .8° downstream from the target. The calorimeter is built out of 2800 elements, each of which consists of a lead glass block, an FEU 84-3 PMT, and a custom Cockcroft-Walton electronic base. In the Fall of 2011, a 25 element prototype detector was installed in Hall B of Jefferson Lab to measure the energy and timing resolution of the calorimeter using electrons between 100 and 250 MeV. The design and construction of FCAL and the results from the prototype test will be discussed.

  7. Investigations of the characteristics of the DELPHI hadron calorimeter prototype

    International Nuclear Information System (INIS)

    The characteristics of the DELHI hadron calorimeter prototype in various modes of operation of its detectors are presented in this paper. It is shown that the transition to a saturated proportional mode and use of more sensitive electronics do not make worse the hadron calorimeter operation. The possibility to select muon tracks in the hadron calorimeter and to use them for detector triggering has been investigated. The results of nuclear shower simulation in the detector are presented. The form of the dependence between signals from the electromagnetic and hadron calorimeters has been found out. The supposition to improve the procedure of the hadron energy reconstruction with the help of the discovered function has been made

  8. ALICE DCS web feed publication

    CERN Document Server

    Verdu Torres, Daniel

    2015-01-01

    The ALICE Detector Control System is a complex hardware and software infrastructure and is running in a protected network environment. Monitoring data, announcements and alarms are made accessible to interested users in several different ways: dedicated panels running on operator nodes, web sites, email and sms. The project aims to aggregate information coming from several different systems, categorize according to its nature, reformat and publish on a dedicated web site. For this purpose, I have used "WinCC_OA" software tool, which is the software used by the ALICE DCS group.

  9. LYSO crystal calorimeter readout with silicon photomultipliers

    Science.gov (United States)

    Berra, A.; Bonvicini, V.; Cecchi, C.; Germani, S.; Guffanti, D.; Lietti, D.; Lubrano, P.; Manoni, E.; Prest, M.; Rossi, A.; Vallazza, E.

    2014-11-01

    Large area Silicon PhotoMultipliers (SiPMs) are the new frontier of the development of readout systems for scintillating detectors. A SiPM consists of a matrix of parallel-connected silicon micropixels operating in limited Geiger-Muller avalanche mode, and thus working as independent photon counters with a very high gain (~106). This contribution presents the performance in terms of linearity and energy resolution of an electromagnetic homogeneous calorimeter composed of 9 ~ 18X0 LYSO crystals. The crystals were readout by 36 4×4 mm2 SiPMs (4 for each crystal) produced by FBK-irst. This calorimeter was tested at the Beam Test Facility at the INFN laboratories in Frascati with a single- and multi-particle electron beam in the 100-500 MeV energy range.

  10. LHCb: Upgrade of the LHCb calorimeter electronics

    CERN Multimedia

    Mauricio Ferre, J

    2013-01-01

    The LHCb collaboration foresees a major upgrade of the detector for the high luminosity run that should take place after 2018. Apart from the increase of the instantaneous luminosity at the interaction point of the experiment, one of the major ingredients of this upgrade is a full readout at 40MHz of the sub-detectors and the acquisition of the data by a large farm of PC. The trigger will be done by this farm and should increase the overall trigger efficiency with respect to the current detector, especially in hadronic B meson decays. A general overview of the modifications foreseen to the calorimeter system and the integration of the electromagnetic and hadronic calorimeters in this new scheme will be described.

  11. Status of the ATLAS Liquid Argon Calorimeter and its performance after one year of LHC operation

    CERN Document Server

    "Hoffman, J A; The ATLAS collaboration

    2011-01-01

    The ATLAS experiment is designed to study the proton-proton collisions produced at the LHC with a centre-of-mass energy of 14 TeV. Liquid argon (LAr) sampling calorimeters are used in ATLAS for all electromagnetic calorimetry covering the pseudorapidity region η<3.2, as well as for hadronic calorimetry from η=1.4 to η=4.8. The calorimeter system consists of an electromagnetic barrel calorimeter and two endcaps with electromagnetic (EMEC), hadronic (HEC) and forward (FCAL) calorimeters. The lead-liquid argon sampling technique with an accordion geometry was chosen for the barrel electromagnetic calorimeter (EMB) and adapted to the endcap (EMEC). This geometry allows a uniform acceptance over the whole azimuthal range without any gap. The hadronic endcap calorimeter (HEC) uses a copper-liquid argon sampling technique with plate geometry and is subdivided into two wheels in depth per end-cap. Finally, the forward calorimeter (FCAL) is composed of three modules featuring cylindrical electrodes with thin...

  12. 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...

  13. Alice Views Jupiter and Io

    Science.gov (United States)

    2007-01-01

    This graphic illustrates the pointing and shows the data from one of many observations made by the New Horizons Alice ultraviolet spectrometer (UVS) instrument during the Pluto-bound spacecraft's recent encounter with Jupiter. The red lines in the graphic show the scale, orientation, and position of the combined 'box and slot' field of view of the Alice UVS during this observation. The positions of Jupiter's volcanic moon, Io, the torus of ionized gas from Io, and Jupiter are shown relative to the Alice field of view. Like a prism, the spectrometer separates light from these targets into its constituent wavelengths. Io's volcanoes produce an extremely tenuous atmosphere made up primarily of sulfur dioxide gas, which, in the harsh plasma environment at Io, breaks down into its component sulfur and oxygen atoms. Alice observed the auroral glow from these atoms in Io's atmosphere and their ionized counterparts in the Io torus. Io's dayside is deliberately overexposed to bring out faint details in the plumes and on the moon's night side. The continuing eruption of the volcano Tvashtar, at the 1 o'clock position, produces an enormous plume roughly 330 kilometers (200 miles) high, which is illuminated both by sunlight and 'Jupiter light.'

  14. 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...

  15. The ALICE Magnetic System Computation.

    CERN Document Server

    Klempt, W; CERN. Geneva; Swoboda, Detlef

    1995-01-01

    In this note we present the first results from the ALICE magnetic system computation performed in the 3-dimensional way with the Vector Fields TOSCA code (version 6.5) [1]. To make the calculations we have used the IBM RISC System 6000-370 and 6000-550 machines combined in the CERN PaRC UNIX cluster.

  16. 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…

  17. 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.

  18. LHCb : First years of running for the LHCb calorimeter system and preparation for run 2

    CERN Multimedia

    Chefdeville, Maximilien

    2015-01-01

    The LHCb experiment is dedicated to precision measurements of CP violation and rare decays of B hadrons at the Large Hadron Collider (LHC) at CERN (Geneva). It comprises a calorimeter system composed of four subdetectors: a Scintillating Pad Detector (SPD) and a Pre-Shower detector (PS) in front of an electromagnetic calorimeter (ECAL) which is followed by a hadron calorimeter (HCAL). They are used to select transverse energy hadron, electron and photon candidates for the first trigger level and they provides the identification of electrons, photons and hadrons as well as the measurement of their energies and positions. The calorimeter has been pre-calibrated before its installation in the pit. The calibration techniques have been tested with data taken in 2010 and used regularly during run 1. For run 2, new calibration methods have been devised to follow and correct online the calorimeter detector response. The design and construction characteristics of the LHCb calorimeter will be recalled. Strategies for...

  19. ATLAS - End-Cap calorimeter

    CERN Multimedia

    2006-01-01

    The End-cap calorimeter was moved with the help of the rails and this calorimeter will measure the energy of particles close to the beam axis when protons collide. Cooling is important for maximum detector efficiency.

  20. Testing a liquid Argon calorimeter

    CERN Multimedia

    1976-01-01

    Physicists from Karlsruhe test a liquid argon calorimeter in the neutral beam b16 at the PS. The calorimeter was meant to supply some neutral particles identification at the Split-Field Magnet Facility for R416.

  1. The ATLAS Tile Calorimeter

    CERN Document Server

    Henriques Correia, Ana Maria

    2015-01-01

    TileCal is the Hadronic calorimeter covering the most central region of the ATLAS experiment at the LHC. It uses iron plates as absorber and plastic scintillating tiles as the active material. Scintillation light produced in the tiles is transmitted by wavelength shifting fibres to photomultiplier tubes (PMTs). The resulting electronic signals from the approximately 10000 PMTs are measured and digitised every 25 ns before being transferred to off-detector data-acquisition systems. This contribution will review in a first part the performances of the calorimeter during run 1, obtained from calibration data, and from studies of the response of particles from collisions. In a second part it will present the solutions being investigated for the ongoing and future upgrades of the calorimeter electronics.

  2. Elliptic flow measurement of heavy flavour decay electrons in Pb-Pb collisions at √(s) 2.76 TeV with ALICE

    International Nuclear Information System (INIS)

    In heavy-ion collisions, charm and beauty quarks are produced in the initial hard scattering processes. They then propagate and interact strongly with the created medium, the Quark Gluon Plasma (QGP), and thus allow to probe its properties. One way to measure heavy-quarks is via electrons from the semileptonic decays of open charm and beauty hadrons. At low transverse momentum, the level of thermalization of heavy quarks can be studied via the azimuthal anisotropy of the heavy flavour electron emission in the transverse plane, the elliptic flow, v2. At high pt, v2 provides insight on the path length dependence of parton energy-loss. In this talk we present v2 measurements of electrons from heavy flavour decays at mid rapidity with ALICE in semi-central (20-40%) Pb-Pb collisions at √(sNN)=2.76 TeV. The electrons are identified using the Time Of Flight detector and Time Projection Chamber at low momenta, as well as the Electromagnetic Calorimeter at higher momenta. The latter provides in addition the possibility to trigger on electrons in the collision. We report on the electron identification and explain how the non-heavy flavour electron background is subtracted. Finally the results are compared to different theoretical models.

  3. Experimental study of the test module of the electromagnetic end-cap calorimeter for the ATLAS experiment. Study of the spin correlation in the production of pairs tt-bar; Etude experimentale des performances du module 0 du calorimetre electromagnetique bouchon d'ATLAS. Etude de la correlation de spin dans la production des paires tt-bar au LHC

    Energy Technology Data Exchange (ETDEWEB)

    Hinz, L

    2001-06-01

    LHC, the future CERN proton collider, will start in 2006. It will be devoted to a better understanding of the Standard Model and new physics research. With a 10 {integral}b{sup -1} per year at low luminosity during the first three years, then 100 {integral}b{sup -1} per year, and energy of 14 TeV in the center of mass, the LHC is designed to discover the Standard or SUSY Higgs boson, or probe signature of new physics. ATLAS, one of the four experiments at the LHC, can study a large physics range, as Higgs boson, top and bottom, gauge bosons and new particles expected by SUSY model or other models beyond the Standard Model. The CPPM laboratory is responsible of a part of the electromagnetic end-cap calorimeter for the ATLAS experiment. In 1999, an ATLAS-like prototype of module was stacked in Marseille and intensively tested at CERN. Description of the calorimeter and a part of test-beam results are presented in this PhD manuscript. In parallel, a study about potentiality of the tt-bar spin correlation measurement was done. The high tt-bar statistic produced at the LHC allows to explore the quark top properties in details and being sensitive to new physics phenomena. Signatures of such physics can be extracted from tt-bar decay product angular distributions which are sensitive to tt-bar spin correlation. (authors)

  4. Pion showers in highly granular calorimeters

    Indian Academy of Sciences (India)

    Jaroslav Cvach; on behalf of the CALICE Collaboration

    2012-10-01

    New results on properties of hadron showers created by pion beam at 8–80 GeV in high granular electromagnetic and hadron calorimeters are presented. Data were used for the first time to investigate the separation of the neutral and charged hadron showers. The result is important to verify the prediction of the PFA algorithm based up to now on the simulated data only. Next, the properties of hadron showers were compared to different physics lists of GEANT4 version 9.3.

  5. Construction and tests of the Atlas barrel pre sampler and study of the photon/pion rejection in the electromagnetic calorimeter; Realisation du pre-echantillonneur central d'ATLAS et etude de la separation {gamma}/{pi}{sup 0} dans le calorimetre electromagnetique

    Energy Technology Data Exchange (ETDEWEB)

    Saboumazrag, S

    2004-02-01

    ATLAS is one of the detectors which will equip the future proton-proton collider LHC at CERN. The main motivation for the ATLAS experiment is the quest for the Higgs boson. The observation of this particle would be an important step in the understanding of particle physics in the context of the standard model, with or without supersymmetry. This thesis aims to present the construction of the barrel pre-sampler which will equip the front face of the ATLAS electromagnetic calorimeter. The construction and tests of sectors were achieved at the Laboratory of Subatomic Physics and Cosmology of Grenoble. Two of these sectors were mounted on one module of the electromagnetic calorimeter and tested with electron, photon and muon beams at CERN. I participated in these tests and analysed the data. The results were compared to a Monte-Carlo simulation GEANT3. One of the difficulties lies in the necessity to discard photons coming from {pi}{sup 0} {yields} {gamma}{gamma} events because they can be mistaken for photons released in gamma channels of Higgs boson decay. In the mass range spreading from 95 MeV to 150 MeV, H{sup 0} {yields} {gamma}{gamma} is the most adequate process to detect the Higgs boson. A study of the discard parameter {gamma}/{pi}{sup 0} has been performed. For a photon detection efficiency of 90%, the average discard parameter has been assessed to be 2.5 which is slightly lower than the value given by the simulation.

  6. Geiger projection calorimeter

    International Nuclear Information System (INIS)

    In view of a second generation p-decay experiment in the Gran Sasso Laboratory, a digital tracking calorimeter is being developed, based on the use of plastic tubes of the Mont Blanc detector type, which are operated in limited Geiser mode

  7. Gas calorimeter workshop: proceedings

    International Nuclear Information System (INIS)

    Gas calorimeters combining functions of energy measurement and fine tracking have become more and more popular in the past few years. They help identify muons, gammas, electrons, and hadrons within dense tracks from transverse and longitudinal shower development. Fine segmentation capability using pads and strips on the cathodes have made gas-sampling calorimeters very attractive for colliding-beam detectors where a large multiplicity of particles are detected in a projected geometry. Linearity, energy resolution, shower position resolution, multishower resolution, and calibration questions were discussed in detail at the workshop. Ease of energy calibration by monitoring radioactive sources, good gain uniformity, and gain stability obtained were among the topics of the speakers. There was a discussion session on the operation mode of wire chambers. Gas calorimeters have been used successfully at CERN, Cornell, Fermilab, and SLAC for experiments. Some of the results from those large-scale devices were reported. Future usage of gas-sampling calorimeters for colliding-beam experiments at Fermilab and CERN were discussed. Wire chambers using extruded conductive plastic tubes have made construction easy of pads and strips which can conveniently read out induced signals from the cathode. The results of extensive studies on such devices were discussed. Separate entries were prepared for the data base for the 17 papers presented

  8. The ATLAS tile calorimeter

    CERN Multimedia

    Maximilien Brice

    2003-01-01

    Louis Rose-Dulcina, a technician from the ATLAS collaboration, works on the ATLAS tile calorimeter. Special manufacturing techniques were developed to mass produce the thousands of elements in this detector. Tile detectors are made in a sandwich-like structure where these scintillator tiles are placed between metal sheets.

  9. Automatic low-temperature calorimeter

    International Nuclear Information System (INIS)

    This paper describes a low-temperature adiabatic calorimeter with a range of 1.5-500K. The system for maintaining adiabatic conditions is implemented by two resitance thermometers, whose sensitivity at low temperatures is several orders higher than that of thermocouples. The calorimeter cryostat is installed in an STG-40 portable Dewar flask. The calorimeter is controlled by an Elektronika-60 microcomputer. Standard platinum and germanium thermometers were placed inside of the calorimeter to calibrate the thermometers of the calorimeter and the shield, and the specific heats of specimens of OSCh 11-4 copper and KTP-8 paste were measured to demonstrate the possibilities of the described calorimeter. Experience with the calorimeter has shown that a thorough study of the dependence of heat capacity on temperature (over 100 points for one specimen) can be performed in one or two dats

  10. The ALICE detector data link

    CERN Document Server

    Rubin, G; Csató, P; Dénes, E; Kiss, T; Meggyesi, Z; Sulyán, J; Vesztergombi, G; Eged, B; Gerencsér, I; Novák, I; Soós, C; Tarján, D; Telegdy, A; Tóth, N

    1999-01-01

    The ALICE detector data link has been designed to cover all the needs for data transfer between the detector and the data-acquisition system. It is a 1 Gbit/s, full-duplex, multi-purpose fibre optic link that can be used as a medium for the bi-directional transmission of data blocks between the front-end electronics and the data- acquisition system and also for the remote control and test of the front-end electronics, In this paper the concept, the protocol, the specific test tools, the prototypes of the detector data link and the read-out receiver card, their application in the ALICE-TPC test system and the integration with the DATE software are presented. The test results on the performance are also shown. (14 refs).

  11. 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...

  12. HARP: high-pressure argon readout for calorimeters

    International Nuclear Information System (INIS)

    Steel tubes of approximately 8 mm O.D., filled with Argon gas to approx. 200 bar, are considered as the active element for a charge collecting sampling calorimeter readout system. The tubes are permanently sealed and operated in the ion chamber mode, with the charge collection on a one-millimeter concentric anode. We present the motivation for such a device, including Monte Carlo predictions of performance. The method of construction and signal collection are discussed, with initial results on leakage and ageing of the filling gas. A prototype electromagnetic calorimeter is described

  13. Study of a Novel Concept for a Liquid Argon Calorimeter \

    CERN Multimedia

    2002-01-01

    % RD33 \\\\ \\\\ The development of a fast, highly granular and compact electromagnetic liquid argon calorimeter prototype is proposed as a generic R\\&D project for a novel concept of calorimetry in proton-proton and electron-positron collider detectors: the $^{\\prime$Thin Gap Turbine$^{\\prime}$ (TGT). The TGT calorimeter has a modular construction, is flexible in its longitudinal and transverse granularity, and offers a uniform energy response and resolution, independent of the production angle of incident particles. An important aspect of the project is the development of fast, radiation-hard front-end electronics which is operating in the cold.

  14. The Electromagentic Barrel Calorimeter for the GlueX Experiment

    OpenAIRE

    Barbi, M

    2006-01-01

    The electromagnetic barrel calorimeter is one of the main components of the planned GlueX experiment. It will consist of 48 modules made of consecutive layers of 4 m long lead sheet and fast green scintillator fibers for an overall number of approximately 3000 readout channels with silicon photomultiplier-based photo-sensors for light collection. The calorimeter is expected to achieve energy and time resolution better than 5%/sqrt(E)+2% and 200 ps, respectively. In this contribution we presen...

  15. The response of a streamer tube sampling calorimeter to electrons

    International Nuclear Information System (INIS)

    We have constructed a simple modular electromagnetic calorimeter with 0.8 X0 copper absorbers using gas sampling with streamer tubes. To suppress saturation effects we use small cell streamer tubes (6 mm x 6 mm) filled with pure isobutane. The calorimeter has been tested with electrons in the energy range from 1 to 6 GeV. In this range the instrument shows a linear response. The energy resolution from pad and wire signals amounts to sigmaapprox.=20%/√E. The longitudinal shower profiles are in reasonable agreement with expectations from standard shower calculations. (orig.)

  16. The Zeus calorimeter first level trigger

    Energy Technology Data Exchange (ETDEWEB)

    Smith, W.J. [Univ. of Wisconsin, Madison, WI (United States)

    1989-04-01

    The design of the Zeus Detector Calorimeter Level Trigger is presented. The Zeus detector is being built for operation at HERA, a new storage ring that will provide collisions between 820 GeV protons and 30 GeV electrons in 1990. The calorimeter is made of depleted uranium plates and plastic scintillator read out by wavelength shifter bars into 12,864 photomultiplier tubes. These signals are combined into 974 trigger towers with separate electromagnetic and hadronic sums. The calorimeter first level trigger is pipelined with a decision provided 5 {mu}sec after each beam crossing, occurring every 96 nsec. The trigger determines the total energy, the total transverse energy, the missing energy, and the energy and number of isolated electrons and muons. It also provides information on the number and energy of clusters. The trigger rate needs to be held to 1 kHz against a rate of proton-beam gas interactions of approximately 500 kHz. The summed trigger tower pulseheights are digitized by flash ADC`s. The digital values are linearized, stored and used for sums and pattern tests.

  17. Precision timing calorimeter for high energy physics

    Science.gov (United States)

    Anderson, Dustin; Apresyan, Artur; Bornheim, Adolf; Duarte, Javier; Peña, Cristián; Spiropulu, Maria; Trevor, Jason; Xie, Si; Ronzhin, Anatoly

    2016-07-01

    Scintillator based calorimeter technology is studied with the aim to achieve particle detection with a time resolution on the order of a few 10 ps for photons and electrons at energies of a few GeV and above. We present results from a prototype of a 1.4×1.4×11.4 cm3 sampling calorimeter cell consisting of tungsten absorber plates and Cerium-doped Lutetium Yttrium Orthosilicate (LYSO) crystal scintillator plates. The LYSO plates are read out with wave lengths shifting fibers which are optically coupled to fast photo detectors on both ends of the fibers. The measurements with electrons were performed at the Fermilab Test Beam Facility (FTBF) and the CERN SPS H2 test beam. In addition to the baseline setup plastic scintillation counter and a MCP-PMT were used as trigger and as a reference for a time of flight measurement (TOF). We also present measurements with a fast laser to further characterize the response of the prototype and the photo sensors. All data were recorded using a DRS4 fast sampling digitizer. These measurements are part of an R&D program whose aim is to demonstrate the feasibility of building a large scale electromagnetic calorimeter with a time resolution on the order of 10 ps, to be used in high energy physics experiments.

  18. First Half Of CMS Hadron Calorimeter Completed

    CERN Multimedia

    2001-01-01

    CMS HCAL electronics coordinator John Elias from Fermilab inspecting the assembled first half of the calorimeter. The first half barrel of the CMS hadron calorimeter was completed last month and assembly work on the elements of the second half commenced just last week. This is not a simple task considering the fact that the constructed half-barrel consists of eighteen 30 tonne segments each made with 0.15 mm tolerance. But through the work of everyone on the CMS hadron calorimeter team it is all moving forward. In the LHC, detection of particles produced in collisions of two proton beams requires measurement of their energy. To do this, the particle energy has to be changed into a form that can be easily measured. This is achieved by stopping the initial particles in a dense medium, where they create a shower of secondary particles. While particles that interact through electromagnetic forces (electrons and positrons) create relatively small showers, the size of showers created by hadrons, particles that i...

  19. 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.

  20. ALICE Detector Status and Commissioning

    OpenAIRE

    Gustafsson, Hans-Ake

    2007-01-01

    The Large Hadron Collider (LHC) will start operation in the end of 2007 colliding proton and lead beams at \\surd S = 14 TeV and \\surd S_{NN} = 5.5 TeV, respectively. The accelerator and the experiments are under construction and detailed studies of the physics program are being prepared. I will in this paper review the current status of the ALICE experiment and the heavy ion physics aspects that are unique at LHC.

  1. Design studies and sensor tests for the beam calorimeter of the ILC detector

    International Nuclear Information System (INIS)

    The International Linear Collider (ILC) is being designed to explore particle physics at the TeV scale. The design of the Very Forward Region of the ILC detector is considered in the presented work. The Beam Calorimeter - one of two electromagnetic calorimeters situated there - is the subject of this thesis. The Beam Calorimeter has to provide a good hermeticity for high energy electrons, positrons and photons down to very low polar angles, serve for fast beam diagnostics and shield the inner part of the detector from backscattered beamstrahlung remnants and synchrotron radiation. As a possible technology for the Beam Calorimeter a diamond-tungsten sandwich calorimeter is considered. Detailed simulation studies are done in order to explore the suitability of the considered design for the Beam Calorimeter objectives. Detection efficiency, energy and angular resolution for electromagnetic showers are studied. At the simulation level the diamondtungsten design is shown to match the requirements on the Beam Calorimeter performance. Studies of polycrystalline chemical vapour deposition (pCVD) diamond as a sensor material for the Beam Calorimeter are done to explore the properties of the material. Results of the measurements performed with pCVD diamond samples produced by different manufacturers are presented. (orig.)

  2. Design studies and sensor tests for the beam calorimeter of the ILC detector

    Energy Technology Data Exchange (ETDEWEB)

    Kuznetsova, E.

    2007-03-15

    The International Linear Collider (ILC) is being designed to explore particle physics at the TeV scale. The design of the Very Forward Region of the ILC detector is considered in the presented work. The Beam Calorimeter - one of two electromagnetic calorimeters situated there - is the subject of this thesis. The Beam Calorimeter has to provide a good hermeticity for high energy electrons, positrons and photons down to very low polar angles, serve for fast beam diagnostics and shield the inner part of the detector from backscattered beamstrahlung remnants and synchrotron radiation. As a possible technology for the Beam Calorimeter a diamond-tungsten sandwich calorimeter is considered. Detailed simulation studies are done in order to explore the suitability of the considered design for the Beam Calorimeter objectives. Detection efficiency, energy and angular resolution for electromagnetic showers are studied. At the simulation level the diamondtungsten design is shown to match the requirements on the Beam Calorimeter performance. Studies of polycrystalline chemical vapour deposition (pCVD) diamond as a sensor material for the Beam Calorimeter are done to explore the properties of the material. Results of the measurements performed with pCVD diamond samples produced by different manufacturers are presented. (orig.)

  3. The CMS electromagnetic calorimeter and the search for the Higgs boson in the decay channel H {yields} WW{sup *} {yields} 2e2{nu}; Le calorimetre electromagnetique de CMS et la recherche du boson de Higgs dans le canal de desintegration H {yields} WW{sup *} {yields} 2e2{nu}

    Energy Technology Data Exchange (ETDEWEB)

    Rovelli, I.Ch

    2006-01-15

    CMS is one of the four experiments that will take data at the LHC. Large part of my work was devoted to the development of electron reconstruction tools aimed at improving the Higgs boson discovery potential in the H {yields} WW{sup *} {yields} 2e2{nu} channel. A major role in the electron reconstruction is played by the electromagnetic calorimeter ECAL, an homogeneous calorimeter made of scintillating PbWO{sub 4} crystals. The first 3 chapters give an overview of LHC and CMS.In chapter 4 the analysis of the data collected during the 2003 electromagnetic calorimeter test beam is presented. First the problem of the intercalibration at the test beam is addressed. This is a major task, since the precision of the intercalibration directly affects the constant term of the energy resolution, for which the CMS goal is to reach a precision better than 0.5%. The good initial intercalibration, anyway, could be spoiled during the data taking by the effects of the radiation on the crystals, which can change the relative responses of the channels. A monitoring laser system is foreseen at CMS. The possibility to check the calibration stability and to correct the changes in the response with a precision within the required limits is demonstrated. Chapter five describes the electron reconstruction and identification in CMS. A crucial problem for the electron reconstruction is represented by the Bremsstrahlung emission in the tracker. A tracking procedure dealing with the Bremsstrahlung energy loss is discussed. Together with an improvement in the reconstruction efficiency, the procedure allows to identify electrons with a small fraction of radiated energy, which can be usefully exploited for the ECAL calibration. The developed algorithms are applied in chapter 6, which presents the study of the CMS discovery potential of the Higgs boson in the H {yields} WW{sup *} {yields} 2e2{nu} channel. This is the discovery channel in the range of masses between 2m{sub W} and 2m{sub Z}. Here

  4. 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...

  5. 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...

  6. The LHCb hadron calorimeter prototype

    International Nuclear Information System (INIS)

    LHCb is a Large Hadron Collider Beauty experiment dedicated for precision measurements of CP violation and rare phenomena. The experiment is built as a single arm detector covering a forward angle between ∼ 15 mrad and ∼ 300 mrad. It consists in a vertex detector, a tracking system, two RICH detectors, a calorimeter system comprising a preshower, electromagnetic and hadron sections, and a muon system. The role of the calorimeters is to provide identification of the electrons and hadrons for trigger and offline analysis with measurements of position and energy. The hadron calorimeter (HCAL) has to provide data for the trigger and to assist in background suppression when B decays are reconstructed. In 1997 an HCAL prototype stack of 3 modules, each having the dimensions 96 x 16 x 153 cm3, has been constructed and exposed to the X7 test beams of the SPS at CERN. Each module is constructed from scintillator tiles embedded in an iron structure, which are parallel to the beam direction in a staggered arrangement. The cell segmentation of the 1997 prototype was 16 x 16 cm2 and had a 2-fold in depth readout. Around 3760 spacer plates and weld straps necessary for all 6 modules were supplied by Romanian group of IFIN-HH in 1997, as well as about 200 master plates for two modules in 1998. The assembling of the modules was performed at CERN by people of our group, IHEP Serpukhov and CERN. During November 1997 test beam data were taken with pion and electron beams of 5 up to 50 GeV/c momenta. The energy spectra for pions were obtained. A shift of about 1.3 GeV of the energy mean value with respect to the beam energy was observed for all studied energies. This could be due to different effects. The energy resolution as a function of the beam energy fitted by the dependence σ/E = a/√E + b gives parameters in agreement with the values expected from Monte Carlo. Uniformity response for pions at 20 GeV oscillates within 2.5 % around the mean value. Data taken with ECAL

  7. The UA1 upgrade calorimeter trigger processor

    International Nuclear Information System (INIS)

    The increased luminosity of the improved CERN Collider and the more subtle signals of second-generation collider physics demand increasingly sophisticated triggering. We have built a new first-level trigger processor designed to use the excellent granularity of the UA1 upgrade calorimeter. This device is entirely digital and handles events in 1.5 μs, thus introducing no deadtime. Its most novel feature is fast two-dimensional electromagnetic cluster-finding with the possibility of demanding an isolated shower of limited penetration. The processor allows multiple combinations of triggers on electromagnetic showers, hadronic jets and energy sums, including a total-energy veto of multiple interactions and a full vector sum of missing transverse energy. This hard-wired processor is about five times more powerful than its predecessor, and makes extensive use of pipelining techniques. It was used extensively in the 1988 and 1989 runs of the CERN Collider. (author)

  8. New Physics requirements and technological challenges to be confronted by calorimeters in particle physics

    International Nuclear Information System (INIS)

    The seminar presents an introduction to calorimetry in particle physics. Initially the purpose of electromagnetic and hadronic calorimeters in particle physics is shown. Then the paper focusses on electromagnetic calorimeters and it describes the microscopic phenomena that drive the formation of electromagnetic showers. Homogeneous and sampling calorimeters are presented and the energy resolution of both is analyzed. A few examples of past and present electromagnetic calorimeters at particle colliders are presented, with particular attention to the ones employed in the Atlas and CMS experiments at the LHC, their design constraints, challenges and adopted choices. Both these calorimeters were designed to operate for a minimum of ten years at the LHC, with an instantaneous luminosity of 1· 1034/cm2/s and for an integrated luminosity of 500/fb. From 2023 a new program will start: the high luminosity LHC (HL-LHC), which is expected to provide an instantaneous luminosity of around 5· 1034/cm2/s and integrate a total luminosity of around 3000/fb in ten years of data taking. The evolution of the CMS and Atlas calorimeters is assessed and needed upgrades are presented

  9. NA48 prototype calorimeter

    CERN Multimedia

    1990-01-01

    This is a calorimeter, a detector which measures the energy of particles. When in use, it is filled with liquid krypton at -152°C. Electrons and photons passing through interact with the krypton, creating a shower of charged particles which are collected on the copper ribbons. The ribbons are aligned to an accuracy of a tenth of a millimetre. The folding at each end allows them to be kept absolutely flat. Each shower of particles also creates a signal in scintillating material embedded in the support disks. These flashes of light are transmitted to electronics by the optical fibres along the side of the detector. They give the time at which the interaction occurred. The photo shows the calorimeter at NA48, a CERN experiment which is trying to understand the lack of anti-matter in the Universe today.

  10. UA2 central calorimeter

    CERN Multimedia

    The UA2 central calorimeter measured the energy of individual particles created in proton-antiproton collisions. Accurate calibration allowed the W and Z masses to be measured with a precision of about 1%. The calorimeter had 24 slices like this one, each weighing 4 tons. The slices were arranged like orange segments around the collision point. Incoming particles produced showers of secondary particles in the layers of heavy material. These showers passed through the layers of plastic scintillator, generating light which was taken by light guides (green) to the data collection electronics. The amount of light was proportional to the energy of the original particle. The inner 23 cm of lead and plastic sandwiches measured electrons and photons; the outer 80 cm of iron and plastic sandwiches measured strongly interacting hadrons. The detector was calibrated by injecting light through optical fibres or by placing a radioactive source in the tube on the bottom edge.

  11. The CMS Outer Hadron Calorimeter

    CERN Document Server

    Acharya, Bannaje Sripathi; Banerjee, Sunanda; Banerjee, Sudeshna; Bawa, Harinder Singh; Beri, Suman Bala; Bhandari, Virender; Bhatnagar, Vipin; Chendvankar, Sanjay; Deshpande, Pandurang Vishnu; Dugad, Shashikant; Ganguli, Som N; Guchait, Monoranjan; Gurtu, Atul; Kalmani, Suresh Devendrappa; Kaur, Manjit; Kohli, Jatinder Mohan; Krishnaswamy, Marthi Ramaswamy; Kumar, Arun; Maity, Manas; Majumder, Gobinda; Mazumdar, Kajari; Mondal, Naba Kumar; Nagaraj, P; Narasimham, Vemuri Syamala; Patil, Mandakini Ravindra; Reddy, L V; Satyanarayana, B; Sharma, Seema; Singh, B; Singh, Jas Bir; Sudhakar, Katta; Tonwar, Suresh C; Verma, Piyush

    2006-01-01

    The CMS hadron calorimeter is a sampling calorimeter with brass absorber and plastic scintillator tiles with wavelength shifting fibres for carrying the light to the readout device. The barrel hadron calorimeter is complemented with a outer calorimeter to ensure high energy shower containment in CMS and thus working as a tail catcher. Fabrication, testing and calibrations of the outer hadron calorimeter are carried out keeping in mind its importance in the energy measurement of jets in view of linearity and resolution. It will provide a net improvement in missing $\\et$ measurements at LHC energies. The outer hadron calorimeter has a very good signal to background ratio even for a minimum ionising particle and can hence be used in coincidence with the Resistive Plate Chambers of the CMS detector for the muon trigger.

  12. ALICE Awards ceremony on 17 March 2006

    CERN Multimedia

    Maximilien Brice

    2006-01-01

    The third annual ALICE Awards ceremony recognizes three companies for their contribution to the experiment'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.

  13. 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."

  14. Performance of the ATLAS Calorimeters and Commissioning for LHC Run-2

    CERN Document Server

    Rossetti, Valerio; The ATLAS collaboration

    2015-01-01

    The ATLAS general-purpose experiment at the Large Hadron Collider (LHC) is equipped with electromagnetic and hadronic liquid-argon (LAr) calorimeters and a hadronic scintillator-steel sampling calorimeter (TileCal) for measuring energy and direction of final state particles in the pseudorapidity range $|\\eta| < 4.9$. The calibration and performance of the calorimetry system was established during beam tests, cosmic ray muon measurements and in particular the first three years of pp collision data-taking. During this period, referred to as Run-1, approximately 27~fb$^{-1}$ of data have been collected at the center-of-mass energies of 7 and 8~TeV. Results on the calorimeter operation, monitoring and data quality, as well as their performance will be presented, including the calibration and stability of the electromagnetic scale, response uniformity and time resolution. These results demonstrate that the LAr and Tile calorimeters perform excellently within their design requirements. The calorimetry system thu...

  15. Time alignment of the front end electronics of the LHCb calorimeters.

    CERN Document Server

    Abellan Beteta, C; Ajaltouni, Z; Amhis, Y; Barsuk, S; Beigbeder-Beau, C; Belyaev, I; Bohner, G; Bonnefoy, R; Breton, D; Calvo Gómez, M; Camilleri, L; Callot, O; Camboni, A; Chanal, H; Charlet, D; Comerma-Montells, A; Cornat, R; Crouau, M; Dalmagne, B; Deschamps, O; Domingo Bonal, F; Drancourt, C; Duarte, O; Dzhelyadin, R; Egorychev, V; Filippov, S; Fulda Quenzer, F; Garra Ticó, J; Garrido, L; Gascon, D; Gaspar de Valenzuela, A; Gioi, L L; Golubkov, D; Golutvin, A; González Bano, C; Grabalosa Gàndara, M; Graciani Díaz, R; Graugés, E; Gushchin, E; Guz, Yu; Jean-Marie, B; Konoplyannikov, A; Kristic, R; Kvaratskheliya, T; Ky, B; Lecoq, J; Lefèvre, R; Lefrançois, J; López Asamar, E; Machefert, F; Machikhiliyan, I; Martens, A; Minard, M N; Monteil, S; Niess, V; Perret, P; Picatoste Olloqui, E; Puig Navarro, A; Reinmuth, G; Riera-Baburés, J; Robbe, P; Roselló, M; Ruiz, H; Savrina, D; Schopper, A; Schune, M H; Shatalov, P; Sobczak, K; T’Jampens, S; Tocut, V; Vàzquez Gómez, R; Viaud, B; Videau, I; Vilasís-Cardona, X; Zhokhov, A

    2012-01-01

    LHCb is the experiment at the Large Hadron Collider at CERN designed for performing studies of CP-symmetry violation and rare decays of B-hadrons. Its calorimeter system allows to trigger on photons and electrons by associating the information from a scintillating pad signing charged particle (SPD), a pre-shower tagging electromagnetic particle (PS), an electromagnetic calorimeter (ECAL) and a hadronic calorimeter (HCAL). We present the principles and procedures for its fine time-alignment through the commissioning and the first collision phases. We give a particular emphasis to the choices made in the electronic design of the calorimeters to deal with the signal shape and spill over. Also we summarise the achieved levels of synchronisation.

  16. 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.

  17. 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?

  18. 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.

  19. ALICE moves into warp drive

    Science.gov (United States)

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

    2012-12-01

    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 towards helping us understand 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 (fixes and new features) taken to increase it. In particular, the eLogbook helps decision making by providing quantitative input, which can be used to better balance risks of changes in the production environment against potential gains in quantity and quality of physics data. It will also present the evolution of the Experiment Control System (ECS) to allow on-the-fly error recovery actions of the detector apparatus while limiting as much as possible the loss of integrated luminosity. The paper will conclude with a review of the ALICE efficiency so far and the future plans to improve its monitoring.

  20. ALICE moves into warp drive

    International Nuclear Information System (INIS)

    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 towards helping us understand 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 (fixes and new features) taken to increase it. In particular, the eLogbook helps decision making by providing quantitative input, which can be used to better balance risks of changes in the production environment against potential gains in quantity and quality of physics data. It will also present the evolution of the Experiment Control System (ECS) to allow on-the-fly error recovery actions of the detector apparatus while limiting as much as possible the loss of integrated luminosity. The paper will conclude with a review of the ALICE efficiency so far and the future plans to improve its monitoring.