WorldWideScience

Sample records for cern cms silicon

  1. The CERN CMS Silicon Strip Tracker Control System

    CERN Document Server

    Drouhin, F; Vintache, D; Marchioro, A; Paillard, C; Ljuslin, C; Siegrist, P; Tsirou, A L; Mirabito, L; Verdini, P G

    2004-01-01

    Due to the high integration level of the experiments planned for the Large Hadron Collider (LHC) of the European Organization for Nuclear Research (CERN), the data acquisition and the control systems need complex developments both in hardware and software. The purpose of this paper is to describe the control system of a sub-detector of one of the CERN experiments, the Tracker of the Compact Muon Solenoid (CMS). The CMS Tracker control system is based on dedicated hardware and software. The hardware is based on the Front End Controller (FEC), an interface board that hosts token rings for the communication with the Control and Communication Unit (CCU) modules. These in turn contain dedicated I/O channels for the front end readout and control chips.The software is built in layers: one device driver, a C++ dedicated application program interface (API) plus a database for the storage of all the information needed for the front end electronics. This system will also be adopted in some other CMS sub-detectors.

  2. CMS Centre at CERN

    CERN Multimedia

    2007-01-01

    A new "CMS Centre" is being established on the CERN Meyrin site by the CMS collaboration. It will be a focal point for communications, where physicists will work together on data quality monitoring, detector calibration, offline analysis of physics events, and CMS computing operations. Construction of the CMS Centre begins in the historic Proton Synchrotron (PS) control room. The historic Proton Synchrotron (PS) control room, Opened by Niels Bohr in 1960, will be reused by CMS to built its control centre. TThe LHC@FNAL Centre, in operation at Fermilab in the US, will work very closely with the CMS Centre, as well as the CERN Control Centre. (Photo Fermilab)The historic Proton Synchrotron (PS) control room is about to start a new life. Opened by Niels Bohr in 1960, the room will be reused by CMS to built its control centre. When finished, it will resemble the CERN Contro...

  3. The "Silicon Wheel" prototype for the barrel of the silicon tracker deep inside the CMS detector at CERN'S future LHC proton collider

    CERN Multimedia

    Laurent Guiraud

    1997-01-01

    Elements on a specially designed structure will track the emerging particles close to the beam pipe. The supporting structure is made out of special carbon fibre discs holding 112 detector modules (448 individual silicon detectors). The modules are arranged to provide three detection points per track and are distributed in seven layers on a spiral geometry to leave enough room for cables, cooling tubes, etc. The inner radius of the wheel is 20.5 cm; the overall diameter is 80 The prototype is a combined CMS silicon community effort; the main participating institutions were: Aachen (Germany), Bari (Italy), CERN, Florence (Italy), Imperial College (UK), Oulu (Finland), Padova, Perugia, Pisa (Italy), Rutherford Laboratory

  4. CERN Open Days CMS Posters

    CERN Multimedia

    Davis, Siona Ruth

    2016-01-01

    Themes: 1) You are here (location P5, Cessy) 2) CERN 3) LHC 4) CMS Detector 5) Magnet 6) Subdetectors (Tracker, ECAL, HCAL, Muons) 7) Trigger and Data Acquisition 8) Collaboration 9) Site Geography 10) Construction 11) Lowering and Installation 12) Physics

  5. CERN Researchers' Night @ CMS + TOTEM

    CERN Multimedia

    Hoch, Michael

    2011-01-01

    Young researchers' shifter training at CMS; • Introduction talk with discussion, • CMS control room shadowing the shifters • TOTEM control room introduction and discusson • Scientific poster work shop and presentation • Science Art installations ‘Faces of CMS’ & ‘Science Cloud’ • CMS Shift diploma presentation

  6. CMS silicon tracker developments

    International Nuclear Information System (INIS)

    The CMS Silicon tracker consists of 70 m2 of microstrip sensors which design will be finalized at the end of 1999 on the basis of systematic studies of device characteristics as function of the most important parameters. A fundamental constraint comes from the fact that the detector has to be operated in a very hostile radiation environment with full efficiency. We present an overview of the current results and prospects for converging on a final set of parameters for the silicon tracker sensors

  7. The CMS silicon tracker

    International Nuclear Information System (INIS)

    This paper describes the Silicon microstrip Tracker of the CMS experiment at LHC. It consists of a barrel part with 5 layers and two endcaps with 10 disks each. About 10 000 single-sided equivalent modules have to be built, each one carrying two daisy-chained silicon detectors and their front-end electronics. Back-to-back modules are used to read-out the radial coordinate. The tracker will be operated in an environment kept at a temperature of T=-10 deg. C to minimize the Si sensors radiation damage. Heavily irradiated detectors will be safely operated due to the high-voltage capability of the sensors. Full-size mechanical prototypes have been built to check the system aspects before starting the construction

  8. CMS Silicon Strip Tracker Monitoring

    CERN Document Server

    Mersi, Stefano

    2010-01-01

    The CMS Silicon Strip Tracker is the largest detector of its kind ever operated, with a silicon surface area of about 200 m$^2$ of silicon surface. The Silicon Strip Tracker it is the sub-detector with the highest number of detector modules within the CMS experiment. Given the complexity of the device, a variety of tools were developed and are used to determine the status of the detector in real time and allow for data qualification and corrective actions when needed. In this paper we describe the monitoring techniques that are used to safely operate the detector and assess the state of its calibration.

  9. New CMS detectors under construction at CERN

    CERN Multimedia

    Katarina Anthony

    2012-01-01

    While the LHC will play the starring role in the 2013/2014 Long Shutdown (LS1), the break will also be a chance for its experiments to upgrade their detectors. CMS will be expanding its current muon detection systems, fitting 72 new cathode strip chambers (CSC) and 144 new resistive plate chambers (RPC) to the endcaps of the detector. These new chambers are currently under construction in Building 904.   CMS engineers install side panels on a CSC detector in Building 904. "The original RPC and CSC detectors were constructed in bits and pieces around the world," says Armando Lanaro, CSC construction co-ordinator. "But for the construction of these additional chambers, we decided to unify the assembly and testing into a single facility at CERN. There, CMS technicians, engineers and physicists are taking raw materials and transforming them into installation-ready detectors.” This new facility can be found in Building 904. Once the assembly site for the strai...

  10. The CMS silicon tracker

    International Nuclear Information System (INIS)

    The new silicon tracker layout (V4) is presented. The system aspects of the construction are discussed together with the expected tracking performance. Because of the high radiation environment in which the detectors will operate, particular care has been devoted to the study of the characteristics of heavily irradiated detectors. This includes studies on performance (charge collection, cluster size, resolution, efficiency) as a function of the bias voltage, integrated fluence, incidence angle and temperature. (author)

  11. The CMS silicon strip tracker

    International Nuclear Information System (INIS)

    The Silicon Strip Tracker (SST) is the intermediate part of the CMS Central Tracker System. SST is based on microstrip silicon devices and in combination with pixel detectors and the Microstrip Gas Chambers aims at performing pattern recognition, track reconstruction and momentum measurements for all tracks with pT≥2 GeV/c originating from high luminosity interactions at √s=14 TeV at LHC. We aim at exploiting the advantages and the physics potential of the precise tracking performance provided by the microstrip silicon detectors on a large scale apparatus and in a much more difficult environment than ever. In this paper we describe the actual SST layout and the readout system. (author)

  12. High Energy Physics Research with the CMS Experiment at CERN

    International Nuclear Information System (INIS)

    The highlight of our last budget period, June 1, 2010, to May 31, 2013, was the discovery of the Higgs boson by the ATLAS and CMS experiments at the CERN Large Hadron Collider (LHC), announced on July 4, 2012, and for which Francois Englert and Peter Higgs were awarded the 2013 Nobel Prize in Physics on October 8, 2013. The Higgs boson was postulated in 1964 to explain how elementary particles obtain mass and was the missing piece of the Standard Model. However, the Standard Model does not describe everything that we know. There are many unanswered questions, such as how can the Higgs boson have the mass that we have observed, are there more Higgs bosons, why is there more matter than antimatter, and what is the invisible dark matter, which constitutes about 85% of the matter in the universe. Our group played a significant role in the discovery of the Higgs boson and in subsequent analyses. We also carried out searches for new physics, in ways that could help elucidate some of the remaining questions. Our role in the CMS detector focused on the Tracker, a silicon strip outer tracker and pixel inner tracker.

  13. CMS Silicon Strip Tracker Operation

    CERN Document Server

    Gotra, Yuri

    2010-01-01

    The CMS Silicon Strip Tracker (SST), comprising 9.6 million readout channels from 15148 modules covering an area of about 200 square meters, needs to be precisely calibrated in order to correctly interpret and reconstruct the events recorded from the detector, ensuring that the SST performance fully meets the physics research program of the CMS experiment. Calibration constants may be derived from promptly reconstructed events as well as from pedestal runs gathered just before the acquisition of physics runs. These calibration procedures were exercised in summer and winter 2009, when the CMS detector was commissioned using cosmic muons and proton-proton collisions at a center-of-mass energies of 900 GeV and 2.36 TeV. During these data taking periods the performance of the SST was carefully studied: the noise of the detector, the data integrity, the signal-to-noise ratio, the hit reconstruction efficiency, the calibration workflows have been all checked for stability and for different conditions, at the module...

  14. The CMS silicon strip tracker modules production

    CERN Document Server

    Giorgi, M

    2006-01-01

    To complete the construction of the CMS silicon strip tracker, about 16,000 silicon microstrip detector modules will be required. In order to guarantee the uniform quality of the produced modules and to be able to match the deadlines requested by the CMS collaboration, a semi-industrialized organization has been developed, and the different components are being presented here.

  15. CERN Open Days 2013, Point 5 - CMS: CMS Experiment

    CERN Multimedia

    CERN Photolab

    2013-01-01

    Stand description: Come to LHC's Point 5 and visit the Compact Muon Solenoid (CMS) experiment that discovered the Higgs boson ! Descend 100 metres underground and take a walk in the cathedral-sized cavern housing the 14,000-tonne CMS detector. Ask Higgs hunters and other scientists just about anything, be it questions about their work, particle physics or the engineering challenges of building CMS.  On surface no restricted access  Point 5 will be abuzz all day long with activities for all ages, including literally "cool" cryogenics shows featuring the world's fastest ice-cream maker, dance performances, and much more.

  16. The CMS Silicon Tracker Alignment

    CERN Document Server

    Castello, R

    2008-01-01

    The alignment of the Strip and Pixel Tracker of the Compact Muon Solenoid experiment, with its large number of independent silicon sensors and its excellent spatial resolution, is a complex and challenging task. Besides high precision mounting, survey measurements and the Laser Alignment System, track-based alignment is needed to reach the envisaged precision.\\\\ Three different algorithms for track-based alignment were successfully tested on a sample of cosmic-ray data collected at the Tracker Integration Facility, where 15\\% of the Tracker was tested. These results, together with those coming from the CMS global run, will provide the basis for the full-scale alignment of the Tracker, which will be carried out with the first \\emph{p-p} collisions.

  17. Kingdom of Bhutan VIP visit at CERN / CMS

    CERN Multimedia

    Hoch, Michael

    2014-01-01

    His Excellency Mr Yeshey Zimba Member of Parliament and His Excellency Daw Penjo Ambassador and Permanent Representative of the Kingdom of Bhutan visiting at CERN the LHC tunnel and the CMS experiment. Further guests were : Mrs Daw Zam, Mrs Thuji Zangmo, Mr. Rinchen Dorji, Mrs Dechen Wangmo, Ms Choni Ome Guided by R. Voss, Michael Hoch, Tiziano Camporesi

  18. VIP visit to CERN P5 CMS of Pakistan Science Members

    CERN Multimedia

    Hoch, Michael

    2012-01-01

    VIP visit to CERN P5 CMS of PAEC & JCPC Science Members List of PAEC Visitors: Dr. Badar Suleman - Member Science PAEC & Member of JCPC Dr. Waqar M. Butt - Member Engineering (Head of HMC3) Dr. Maqsood Ahmad - Chief Scientist (Head of Accelerator Project) List of CMS participants: Prof. Joseph Incandela, CMS Spokesperson Dr. Austin Ball, CMS Technical Coordinator Mr Andrzej Charkiewicz, CMS Resources Manager Dr. Michael Hoch, CMS Outreach activities, CMS photographer and guide Dr. Achille Petrilli, CMS Team Leader

  19. The CMS experiment at the CERN LHC

    OpenAIRE

    Adolphi et al., R.

    2008-01-01

    Austrian Federal Ministry of Science and Research; FNRS and FWO (Belgium); CNPq and FAPERJ (Brazil); Bulgarian Ministry of Education and Science; CERN; CAS and NSFC (China); Croatian Ministry of Science and Technology; University of Cyprus; Estonian Academy of Sciences and NICPB; Academy of Finland, Finish Ministry of Education and Helsinki Institute of Physics; CEA and CNRS/IN2P3 (France); BMBF and DESY (Germany); General Secretariat for Research and Technology (Greece); NK...

  20. The CMS silicon strip tracker and its electronic readout

    International Nuclear Information System (INIS)

    The Large Hadron Collider (LHC) at CERN (Geneva, CH) will be the world's biggest accelerator machine when operation starts in 2006. One of its four detector experiments is the Compact Muon Solenoid (CMS), consisting of a large-scale silicon tracker and electromagnetic and hadron calorimeters, all embedded in a solenoidal magnetic field of 4T, and a muon system surrounding the magnet coil. The Silicon Strip Tracker has a sensitive area of 206m2 with 10 million analog channels which are read out at the collider frequency of 40 MHz. The building blocks of the CMS Tracker are the silicon sensors, APV amplifier ASICs, supporting front-end ASICs, analog and digital optical links as well as data processors and control units in the back-end. Radiation tolerance, readout speed and the huge data volume are challenging requirements. I have modeled the charge collection in silicon detectors which is discussed as well as the concepts of readout amplifiers with respect to the LHC requirements, including the deconvolution method of fast pulse shaping, electronic noise constraints and radiation effects. Moreover, I performed extensive measurements on prototype components of the CMS Tracker and different versions of the APV chip in particular. I contributed to the construction of several detector modules, characterized them in particle beam tests and quantified radiation induced effects on the APV chip and on silicon detectors. In addition I evaluated a prototype of the analog optical link and the analog performance of the back-end digitization unit. The results are very encouraging, demonstrating the feasibility of the CMS Silicon Strip Tracker system and motivating progress towards the construction phase. (author)

  1. Construction of the CMS silicon strip tracker

    International Nuclear Information System (INIS)

    In the last year the CMS experiment has constructed and integrated the largest ever build full Silicon Strip Tracker. The CMS Tracker collaboration set up a unique scheme of quality control to ensure the necessary high quality of all of the 15,148 modules and their super structures. The applied scheme of quality control revealed several problems, which escaped the initial R and D phase, ranging from corrosion effects on the silicon, capton and via problems on the front end hybrids up to aging conductive glue connections. An overview of the construction and qualification experience is given, discussing the major steps which result in the unique experimental device, which the CMS Tracker is currently commissioning

  2. Web based monitoring in the CMS experiment at CERN

    International Nuclear Information System (INIS)

    With the growth in size and complexity of High Energy Physics experiments, and the accompanying increase in the number of collaborators spread across the globe, the importance of widely relaying timely monitoring and status information has grown. To this end, we present online Web Based Monitoring solutions from the CMS experiment at CERN. The web tools developed present data to the user from many underlying heterogeneous sources, from real time messaging systems to relational databases. We provide the power to combine and correlate data in both graphical and tabular formats of interest to the experimentalist, with data such as beam conditions, luminosity, trigger rates, detector conditions and many others, allowing for flexibility on the user side. We also present some examples of how this system has been used during CMS commissioning and early beam collision running at the Large Hadron Collider.

  3. The alignment of the CMS Silicon Tracker

    International Nuclear Information System (INIS)

    The complex system of the CMS all-silicon Tracker, with 15 148 silicon strip and 1440 silicon pixel modules, requires sophisticated alignment procedures. In order to achieve an optimal track-parameter resolution, the position and orientation of its modules need to be determined with a precision of few micrometers. We present results of the alignment of the full Tracker, in its final position, used for the reconstruction of the first collisions recorded by the CMS experiment. The aligned geometry is based on the analysis of several million reconstructed tracks recorded during the commissioning of the CMS experiment, both with cosmic rays and with the first proton-proton collisions. The geometry has been systematically monitored in the different periods of operation of the CMS detector. The results have been validated by several data-driven studies (laser beam cross-checks, track fit self-consistency, track residuals in overlapping module regions, and track parameter resolution) and compared with predictions obtained from a detailed detector simulation. (author)

  4. The Alignment of the CMS Silicon Tracker

    International Nuclear Information System (INIS)

    The complex system of the CMS all-silicon Tracker, with 15148 silicon strips and 1440 silicon pixel modules, requires sophisticated alignment procedures. In order to achieve an optimal track-parameter resolution, the position and orientation of its modules need to be determined with a precision of few micrometers. We present results of the alignment of the full Tracker, in its final position, used for the reconstruction of the first collisions recorded by the CMS experiment. The aligned geometry is based on the analysis of several million reconstructed tracks recorded during the commissioning of the CMS experiment, both with cosmic rays and with the first proton-proton collisions. The geometry has been systematically monitored in the different periods of operation of the CMS detector. The results have been validated by several data-driven studies (laser beam cross-checks, track fit self-consistency, track residuals in overlapping module regions, and track parameter resolution) and compared with predictions obtained from a detailed detector simulation.

  5. Test beam results on irradiated silicon detectors for the CMS Silicon Strip Tracker

    International Nuclear Information System (INIS)

    We report the results of test beams performed at CERN using irradiated microstrip silicon detectors. The detectors were single- and double-sided devices, produced by different manufacturers and irradiated with neutrons at various fluences up to 3.6 x 1013 n/cm2. Signal-to-noise ratio, resolution and efficiency were studied for different values of the incidence angle, of the detector temperature and of the read-out pitch, as a function of the detector bias voltage. The goal of these tests was to optimize the design of the final prototypes for the CMS Silicon Strip Tracker. (author)

  6. The CMS Silicon Strip Tracker Concept, Production, and Commissioning

    CERN Document Server

    Pooth, Oliver

    2010-01-01

    With the start of the Large Hadron Collider LHC at CERN near Geneva, Switzerland, and the huge detectors along this particle accelerator, the largest high energy physics experiments ever are underway. One of the experiments is the CMS detector (Compact Muon Solenoid). With this experiment over 3,000 scientists and engineers worldwide will search for answers to fundamental questions in high energy physics. Oliver Pooth describes the silicon strip tracker of the CMS detector. With a sensitive silicon area of 200 m² it is a central part of the experiment and able to precisely measure charged particles originating from high energy proton collisions at the LHC. In total, more than 15,000 individual silicon strip detector modules were built and tested before they were integrated on larger substructures of the silicon strip tracker. The author discusses methods of quality control that are new to the field of particle detector physics. These methods were established to guarantee a uniform behaviour of all detector m...

  7. The silicon microstrip tracker for CMS

    International Nuclear Information System (INIS)

    The CMS silicon strip tracker involves about 70 m2 of instrumented silicon, with approximately 18500 microstrip detectors read out by 5 x 106 electronics channels. It has to satisfy a set of stringent requirements imposed by the environment and by the physics expected at the LHC: low cell occupancy and good resolution, radiation hardness aided by adequate cooling, low mass combined with high stability. These conditions have been incorporated in a highly modular design of the detector modules and their support structures, chosen to facilitate construction and to allow for easy assembly and maintenance

  8. Silicon strip detector qualification for the CMS experiment

    CERN Document Server

    Kaußen, Gordon

    2008-01-01

    The Compact Muon Solenoid (CMS) is one of the four experiments being installed at the Large Hadron Collider (LHC) which is located at the european organization for nuclear research CERN in Geneva. This proton-proton collider will explore a new energy regime of up to 14TeV center-of-mass energy. To provide the best spatial resolution for the particle trajectory reconstruction and a very fast readout, the inner tracking system of CMS is build up of silicon detectors with a pixel tracker in the center surrounded by a strip tracker. The silicon strip tracker consists of so-called modules representing the smallest detection unit of the tracking device. These modules are mounted on higher-level structures called shells in the tracker inner barrel (TIB), rods in the tracker outer barrel (TOB), disks in the tracker inner disks (TID) and petals in the tracker end caps (TEC). The entire strip tracker spans an active area of about 198m2 and consists of approximately 16000 modules. Before the silicon sensors were assembl...

  9. Future silicon sensors for the CMS Tracker Upgrade

    Science.gov (United States)

    Bernard-Schwarz, Maria; CMS Tracker Collaboration

    2013-01-01

    For the high-luminosity phase of LHC (Large Hadron Collider) at CERN a campaign was started in the CMS (Compact Muon Solenoid) experiment to investigate different radiation hard silicon detectors. Therefore 6 in. silicon wafers were ordered to answer various questions regarding for example the radiation tolerance and the annealing behavior of different sensor material. The testing variety includes sensor versions n-in-p and p-in-n in thicknesses from 50 μm to 300 μm. In terms of sensor material the difference between floating zone, magnetic Czochralski and epitaxial grown silicon is investigated. For the n-in-p sensors, the different isolation technologies, p-stop and p-spray, are tested. The design of the wafer contains test structures, diodes, mini-sensors, long and very short strip sensors, real pixel sensors and double metal routing variants. The irradiation is done with mixed fluences of protons and neutrons which represent the rates of integrated hadrons that are expected in the CMS tracker after the LHC upgrade. This paper presents an overview of results from measurements of non-irradiated test structures with different technologies and also the results after irradiation.

  10. Alignment procedures for the CMS silicon tracker

    CERN Document Server

    Behr, Joerg

    2012-01-01

    The CMS all-silicon tracker consists of 16588 modules. Therefore its alignment procedures require sophisticated algorithms. Advanced tools of computing, tracking and data analysis have been deployed for reaching the targeted performance. Ultimate local precision is now achieved by the determination of sensor curvatures, challenging the algorithms to determine about 200k parameters simultaneously. Systematic biases in the geometry are controlled by adding further information into the alignment workflow, e.g. the mass of decaying resonances. The orientation of the tracker with respect to the magnetic field of CMS is determined with a stand-alone chi-square minimization procedure. The geometries are finally carefully validated. The monitored quantities include the basic track quantities for tracks from both collisions and cosmic muons and physics observables.

  11. Alignment procedures for the CMS silicon tracker

    International Nuclear Information System (INIS)

    The CMS all-silicon tracker consists of 16588 modules. Therefore its alignment procedures require sophisticated algorithms. Advanced tools of computing, tracking and data analysis have been deployed for reaching the targeted performance. Ultimate local precision is now achieved by the determination of sensor curvatures, challenging the algorithms to determine about 200k parameters simultaneously. Systematic biases in the geometry are controlled by adding further information into the alignment workflow, e.g. the mass of decaying resonances. The orientation of the tracker with respect to the magnetic field of CMS is determined with a stand-alone chi-square minimization procedure. The geometries are finally carefully validated. The monitored quantities include the basic track quantities for tracks from both collisions and cosmic muons and physics observables.

  12. CERN Open Data Portal - Improving usability and user experience of CMS Open Data research tools.

    CERN Document Server

    Hirvonsalo, Harri

    2015-01-01

    This report summarizes the work I have done during my assignment as participant of CERN Summer Students 2015 programme. Main goal of my Summer Student project was to lower the bar for people to start utilizing open data that CMS experiment has released in November 2014 to CERN Open Data Portal (http://opendata.cern.ch). Project included various working packages and tasks, such as: -Determine the obstacles that potential users of CMS research oriented open data who don’t have previous knowledge about internal workflow of analysis tasks at CMS experiment would run into. -Produce more introductory material and tutorials for conducting basic physics analyses with CMSSW to CERN Open Data Portal. -Study the feasibility of podio-framework (https://github.com/hegner/podio) for CMS Open Data users. The project work was done under the supervision of Kati Lassila-Perini whom I thank greatly for her help, patience and support.

  13. Silicon strip detector qualification for the CMS experiment

    International Nuclear Information System (INIS)

    To provide the best spatial resolution for the particle trajectory reconstruction and a very fast readout, the inner tracking system of CMS is build up of silicon detectors with a pixel tracker in the center surrounded by a strip tracker. The silicon strip tracker consists of so-called modules representing the smallest detection unit of the tracking device. These modules are mounted on higher-level structures called shells in the tracker inner barrel (TIB), rods in the tracker outer barrel (TOB), disks in the tracker inner disks (TID) and petals in the tracker end caps (TEC). The performance of the participating two shells of the TIB, four rods of the TOB and two petals of the TEC (representing about 1% of the final strip tracker) could be studied in different magnetic fields over a period of approximately two month using cosmic muon signals. The last test before inserting the tracker in the CMS experiment was the Tracker Slice Test performed in spring/summer 2007 at the Tracker Integration Facility (TIF) at CERN after installing all subdetectors in the tracker support tube. Approximately 25% of the strip tracker +z side was powered and read out using a cosmic ray trigger built up of scintillation counters. In total, about 5 million muon events were recorded under various operating conditions. These events together with results from commissioning runs were used to study the detector response like cluster charges, signal-to-noise ratios and single strip noise behaviour as well as to identify faulty channels which turned out to be in the order of a few per mille. The performance of the silicon strip tracker during these different construction stages is discussed in this thesis with a special emphasis on the tracker end caps. (orig.)

  14. Silicon strip detector qualification for the CMS experiment

    Energy Technology Data Exchange (ETDEWEB)

    Kaussen, Gordon

    2008-10-06

    To provide the best spatial resolution for the particle trajectory reconstruction and a very fast readout, the inner tracking system of CMS is build up of silicon detectors with a pixel tracker in the center surrounded by a strip tracker. The silicon strip tracker consists of so-called modules representing the smallest detection unit of the tracking device. These modules are mounted on higher-level structures called shells in the tracker inner barrel (TIB), rods in the tracker outer barrel (TOB), disks in the tracker inner disks (TID) and petals in the tracker end caps (TEC). The performance of the participating two shells of the TIB, four rods of the TOB and two petals of the TEC (representing about 1% of the final strip tracker) could be studied in different magnetic fields over a period of approximately two month using cosmic muon signals. The last test before inserting the tracker in the CMS experiment was the Tracker Slice Test performed in spring/summer 2007 at the Tracker Integration Facility (TIF) at CERN after installing all subdetectors in the tracker support tube. Approximately 25% of the strip tracker +z side was powered and read out using a cosmic ray trigger built up of scintillation counters. In total, about 5 million muon events were recorded under various operating conditions. These events together with results from commissioning runs were used to study the detector response like cluster charges, signal-to-noise ratios and single strip noise behaviour as well as to identify faulty channels which turned out to be in the order of a few per mille. The performance of the silicon strip tracker during these different construction stages is discussed in this thesis with a special emphasis on the tracker end caps. (orig.)

  15. The hardware track finder processor in CMS at CERN

    CERN Document Server

    Kluge, A

    1997-01-01

    The work covers the design of the Track Finder Processor in the high energy experiment CMS (Compact Muon Solenoid, planned for 2005) at CERN/Geneva. The task of this processor is to identify muons and measure their transverse momentum. The track finder processor makes it possible to determine the physical relevance of each high energetic collision and to forward only interesting data to the data an alysis units. Data of more than two hundred thousand detector cells are used to determine the location of muons and measure their transverse momentum. Each 25 ns a new data set is generated. Measurem ent of location and transverse momentum of the muons can be terminated within 350 ns by using an ASIC (Application Specific Integrated Circuit). A pipeline architecture processes new data sets with th e required data rate of 40 MHz to ensure dead time free operation. In the framework of this study specifications and the overall concept of the track finder processor were worked out in detail. Simul ations were performed...

  16. CMS and CERN teams perform delicate surgery on the beamline at –18 m

    CERN Multimedia

    2012-01-01

    Over the Christmas period, teams from CMS and CERN worked on replacing a bellows unit using a very delicate method that ensured the beam pipe vacuum wasn’t affected during the task. Read more in the Technical Coordination contribution in this CMS Bulletin.

  17. CERN Library | Book presentation: "CMS: the art of science" | 26 April

    CERN Multimedia

    CERN Library

    2016-01-01

    "CMS: the art of science", by Michael Hoch, Ian Shipsey, Daniel Denegri, Stephen Preece and Mick Storr.   Tuesday 26 April at 4 p.m. Council Chamber (503 1-001) The physicist as artist: Michael Hoch photographed the extraordinary science cabinet of wonders CMS (the Compact Muon Solenoid Experiment) at CERN. With a foreword by François Englert, 2013 Nobel Laureate in Physics and co-discoverer of the Higgs boson. "CMS: the art of science", by Michael Hoch, Ian Shipsey, Daniel Denegri, Stephen Preece and Mick Storr, Lammerhuber, 2016, ISBN 9783903101043. More information at: https://indico.cern.ch/event/523057/.

  18. Integration of the End Cap TEC+ of the CMS Silicon Strip Tracker

    CERN Document Server

    Adler, Volker; Ageron, Michel; Agram, Jean-Laurent; Atz, Bernd; Barvich, Tobias; Baulieu, Guillaume; Beaumont, Willem; Beissel, Franz; Bergauer, Thomas; Berst, Jean-Daniel; Blüm, Peter; Bock, E; Bogelsbacher, F; de Boer, Wim; Bonnet, Jean-Luc; Bonnevaux, Alain; Boudoul, Gaelle; Bouhali, Othmane; Braunschweig, Wolfgang; Bremer, R; Brom, Jean-Marie; Butz, Erik; Chabanat, Eric; Chabert, Eric Christian; Clerbaux, Barbara; Contardo, Didier; De Callatay, Bernard; Dehm, Philip; Delaere, Christophe; Della Negra, Rodolphe; Dewulf, Jean-Paul; D'Hondt, Jorgen; Didierjean, Francois; Dierlamm, Alexander; Dirkes, Guido; Dragicevic, Marko; Drouhin, Frédéric; Ernenwein, Jean-Pierre; Esser, Hans; Estre, Nicolas; Fahrer, Manuel; Feld, Lutz; Fernández, J; Florins, Benoit; Flossdorf, Alexander; Flucke, Gero; Flügge, Günter; Fontaine, Jean-Charles; Freudenreich, Klaus; Frey, Martin; Friedl, Markus; Furgeri, Alexander; Giraud, Noël; Goerlach, Ulrich; Goorens, Robert; Graehling, Philippe; Grégoire, Ghislain; Gregoriev, E; Gross, Laurent; Hansel, S; Haroutunian, Roger; Hartmann, Frank; Heier, Stefan; Hermanns, Thomas; Heydhausen, Dirk; Heyninck, Jan; Hosselet, J; Hrubec, Josef; Jahn, Dieter; Juillot, Pierre; Kaminski, Jochen; Karpinski, Waclaw; Kaussen, Gordon; Keutgen, Thomas; Klanner, Robert; Klein, Katja; König, Stefan; Kosbow, M; Krammer, Manfred; Ledermann, Bernhard; Lemaître, Vincent; De Lentdecker, Gilles; Linn, Alexander; Lounis, Abdenour; Lübelsmeyer, Klaus; Lumb, Nicholas; Maazouzi, Chaker; Mahmoud, Tariq; Michotte, Daniel; Militaru, Otilia; Mirabito, Laurent; Müller, Thomas; Neukermans, Lionel; Ollivetto, C; Olzem, Jan; Ostapchuk, Andrey; Pandoulas, Demetrios; Pein, Uwe; Pernicka, Manfred; Perriès, Stephane; Piaseki, C; Pierschel, Gerhard; Piotrzkowski, Krzysztof; Poettgens, Michael; Pooth, Oliver; Rouby, Xavier; Sabellek, Andreas; Schael, Stefan; Schirm, Norbert; Schleper, Peter; Schmitz, Stefan Antonius; Schultz von Dratzig, Arndt; Siedling, Rolf; Simonis, Hans-Jürgen; Stahl, Achim; Steck, Pia; Steinbruck, G; Stoye, Markus; Strub, Roger; Tavernier, Stefaan; Teyssier, Daniel; Theel, Andreas; Trocmé, Benjamin; Udo, Fred; Van der Donckt, M; Van der Velde, C; Van Hove, Pierre; Vanlaer, Pascal; Van Lancker, Luc; Van Staa, Rolf; Vanzetto, Sylvain; Weber, Markus; Weiler, Thomas; Weseler, Siegfried; Wickens, John; Wittmer, Bruno; Wlochal, Michael; De Wolf, Eddi A; Zhukov, Valery; Zoeller, Marc Henning

    2009-01-01

    The silicon strip tracker of the CMS experiment has been completed and inserted into the CMS detector in late 2007. The largest sub-system of the tracker is its end cap system, comprising two large end caps (TEC) each containing 3200 silicon strip modules. To ease construction, the end caps feature a modular design: groups of about 20 silicon modules are placed on sub-assemblies called petals and these self-contained elements are then mounted into the TEC support structures. Each end cap consists of 144 petals, and the insertion of these petals into the end cap structure is referred to as TEC integration. The two end caps were integrated independently in Aachen (TEC+) and at CERN (TEC--). This note deals with the integration of TEC+, describing procedures for end cap integration and for quality control during testing of integrated sections of the end cap and presenting results from the testing.

  19. The role of automation in the construction of the CMS silicon strip detector

    International Nuclear Information System (INIS)

    The CMS silicon tracker , requires the assembly of about 16,000 silicon detector modules with reproducible quality. In order to ensure proper module assembly, an automated system has been developed at CERN, based on a high-precision robotic positioning machine. This project has successfully demonstrated the feasibility of high quality and high throughput module assembly. Four assembly centers are now being installed in Europe at Bari, Perugia, Lyon, Brussels and at Padova in addition, as backup. Two assembly centers in USA at Fermilab share the assembly task. All centers will have identical robotic positioning machines in order to assure uniform high quality module construction

  20. User and group storage management the CMS CERN T2 centre

    CERN Document Server

    Cerminara, G; Pfeiffer, A

    2015-01-01

    A wide range of detector commissioning, calibration and data analysis tasks is carried out by CMS using dedicated storage resources available at the CMS CERN Tier-2 centre. Relying on the functionalities of the EOS disk-only storage technology, the optimal exploitation of the CMS user/group resources has required the introduction of policies for data access management, data protection, cleanup campaigns based on access pattern, and long term tape archival. The resource management has been organised around the definition of working groups and the delegation to an identified responsible of each group composition. In this paper we illustrate the user/group storage management, and the development and operational experience at the CMS CERN Tier-2 centre in the 2012-2015 period.

  1. User and group storage management the CMS CERN T2 centre

    Science.gov (United States)

    Cerminara, G.; Franzoni, G.; Pfeiffer, A.

    2015-12-01

    A wide range of detector commissioning, calibration and data analysis tasks is carried out by CMS using dedicated storage resources available at the CMS CERN Tier-2 centre. Relying on the functionalities of the EOS disk-only storage technology, the optimal exploitation of the CMS user/group resources has required the introduction of policies for data access management, data protection, cleanup campaigns based on access pattern, and long term tape archival. The resource management has been organised around the definition of working groups and the delegation to an identified responsible of each group composition. In this paper we illustrate the user/group storage management, and the development and operational experience at the CMS CERN Tier-2 centre in the 2012-2015 period.

  2. Optimization of the silicon sensors for the CMS tracker

    Science.gov (United States)

    Albergo, S.; Angarano, M.; Azzi, P.; Babucci, E.; Bacchetta, N.; Bader, A.; Bagliesi, G.; Basti, A.; Biggeri, U.; Biino, C.; Bilei, G. M.; Bisello, D.; Boemi, D.; Bosi, F.; Borello, L.; Braibant, S.; Breuker, H.; Brunetti, M. T.; Bruzzi, M.; Buffini, A.; Busoni, S.; Candelori, A.; Caner, A.; Castaldi, R.; Castro, A.; Catacchini, E.; Checcucci, B.; Ciampolini, P.; Civinini, C.; Costa, M.; Creanza, D.; D'Alessandro, R.; DeMaria, N.; de Palma, M.; Dell'Orso, R.; Dutta, S.; Favro, G.; Fiore, L.; Focardi, E.; French, M.; Freudenreich, K.; Frey, A.; Friedl, M.; Fürtjes, A.; Giassi, A.; Giorgi, M.; Giraldo, A.; Glessing, W.; Gu, W. H.; Hall, G.; Hammarstrom, R.; Hebbeker, T.; Honkanen, A.; Honma, A.; Hrubec, J.; Huhtinen, M.; Kaminsky, A.; Karimaki, V.; Koenig, St.; Krammer, M.; Lariccia, P.; Lenzi, M.; Loreti, M.; Luebelsmeyer, K.; Lustermann, W.; Mättig, P.; Maggi, G.; Mannelli, M.; Mantovani, G.; Marchioro, A.; Mariotti, C.; Martignon, G.; Mc Evoy, B.; Meschini, M.; Messineo, A.; Migliore, E.; My, S.; Neviani, A.; Paccagnella, A.; Palla, F.; Pandoulas, D.; Papi, A.; Parrini, G.; Passeri, D.; Pernicka, M.; Pieri, M.; Piperov, S.; Potenza, R.; Radicci, V.; Raffaelli, F.; Raymond, M.; Rizzo, F.; Santocchia, A.; Segneri, G.; Selvaggi, G.; Servoli, L.; Sguazzoni, G.; Siedling, R.; Silvestris, L.; Starodumov, A.; Stavitski, I.; Surrow, B.; Tempesta, P.; Tonelli, G.; Tricomi, A.; Tuominiemi, J.; Tuuva, T.; Verdini, P. G.; Viertel, G.; Xie, Z.; Yahong, Li; Watts, S.; Wittmer, B.

    2001-07-01

    The CMS experiment at the LHC will comprise a large silicon strip tracker. This article highlights some of the results obtained in the R&D studies for the optimization of its silicon sensors. Measurements of the capacitances and of the high voltage stability of the devices are presented before and after irradiation to the dose expected after the full lifetime of the tracker.

  3. Optimization of the silicon sensors for the CMS tracker

    International Nuclear Information System (INIS)

    The CMS experiment at the LHC will comprise a large silicon strip tracker. This article highlights some of the results obtained in the R and D studies for the optimization of its silicon sensors. Measurements of the capacitances and of the high voltage stability of the devices are presented before and after irradiation to the dose expected after the full lifetime of the tracker

  4. Optimization of the silicon sensors for the CMS tracker

    Energy Technology Data Exchange (ETDEWEB)

    Albergo, S.; Angarano, M.; Azzi, P.; Babucci, E.; Bacchetta, N.; Bader, A.; Bagliesi, G.; Basti, A.; Biggeri, U.; Biino, C.; Bilei, G.M.; Bisello, D.; Boemi, D.; Bosi, F.; Borello, L.; Braibant, S.; Breuker, H.; Brunetti, M.T.; Bruzzi, M.; Buffini, A.; Busoni, S.; Candelori, A.; Caner, A.; Castaldi, R.; Castro, A.; Catacchini, E.; Checcucci, B.; Ciampolini, P.; Civinini, C.; Costa, M.; Creanza, D.; D' Alessandro, R.; DeMaria, N.; Palma, M. de; Dell' Orso, R.; Dutta, S.; Favro, G.; Fiore, L.; Focardi, E.; French, M.; Freudenreich, K.; Frey, A. E-mail: ariane.frey@cern.ch; Friedl, M.; Fuertjes, A.; Giassi, A.; Giorgi, M.; Giraldo, A.; Glessing, W.; Gu, W.H.; Hall, G.; Hammarstrom, R.; Hebbeker, T.; Honkanen, A.; Honma, A.; Hrubec, J.; Huhtinen, M.; Kaminsky, A.; Karimaki, V.; Koenig, St.; Krammer, M.; Lariccia, P.; Lenzi, M.; Loreti, M.; Luebelsmeyer, K.; Lustermann, W.; Maettig, P.; Maggi, G.; Mannelli, M.; Mantovani, G.; Marchioro, A.; Mariotti, C.; Martignon, G.; Mc Evoy, B.; Meschini, M.; Messineo, A.; Migliore, E.; My, S.; Neviani, A.; Paccagnella, A.; Palla, F.; Pandoulas, D.; Papi, A.; Parrini, G.; Passeri, D.; Pernicka, M.; Pieri, M.; Piperov, S.; Potenza, R.; Radicci, V.; Raffaelli, F.; Raymond, M.; Rizzo, F.; Santocchia, A.; Segneri, G.; Selvaggi, G.; Servoli, L.; Sguazzoni, G.; Siedling, R.; Silvestris, L.; Starodumov, A.; Stavitski, I.; Surrow, B.; Tempesta, P.; Tonelli, G.; Tricomi, A.; Tuominiemi, J.; Tuuva, T.; Verdini, P.G.; Viertel, G.; Xie, Z.; Yahong, Li; Watts, S.; Wittmer, B

    2001-07-01

    The CMS experiment at the LHC will comprise a large silicon strip tracker. This article highlights some of the results obtained in the R and D studies for the optimization of its silicon sensors. Measurements of the capacitances and of the high voltage stability of the devices are presented before and after irradiation to the dose expected after the full lifetime of the tracker.

  5. Operating characteristics of radiation-hardened silicon pixel detectors for the CMS experiment

    CERN Document Server

    Hyosung, Cho

    2002-01-01

    The Compact Muon Solenoid (CMS) experiment at the CERN Large Hadron Collider (LHC) will have forward silicon pixel detectors as its innermost tracking device. The pixel devices will be exposed to the harsh radiation environment of the LHC. Prototype silicon pixel detectors have been designed to meet the specification of the CMS experiment. No guard ring is required on the n/sup +/ side, and guard rings on the p/sup +/ side are always kept active before and after type inversion. The whole n/sup +/ side is grounded and connected to readout chips, which greatly simplifies detector assembling and improves the stability of bump-bonded readout chips on the n/sup +/ side. Operating characteristics such as the leakage current, the full depletion voltage, and the potential distributions over guard rings were tested using standard techniques. The tests are discussed in this paper. (9 refs).

  6. Control system design of the CERN/CMS tracker thermal screen

    CERN Document Server

    Carrone, E

    2003-01-01

    The Tracker is one of the CMS (Compact Muon Solenoid experiment) subdetectors to be installed at the LHC (Large Hadron Collider) accelerator, scheduled to start data taking in 2007 at CERN (European Organization for Nuclear Research). The tracker will be operated at a temperature of -10 degree C in order to reduce the radiation damage on the silicon detectors; hence, an insulated environment has to be provided by means of a screen that introduces a thermal separation between the Tracker and the neighboring detection systems. The control system design includes a formal description of the process by means of a thermodynamic model; then, the electrical equivalence is derived. The transfer function is inferred by the ratio of the voltage on the outer skin and the voltage input, i.e. the ratio of the temperature outside the tracker and the heat generated (which is the controlled variable). A PID (Proportional Integral Derivative) controller has been designed using MatLab. The results achieved so far prove that thi...

  7. Software for the alignment of the CMS experiment at CERN

    International Nuclear Information System (INIS)

    In the CMS experiment the position of the muon chambers has to be known with precision of the order of 100 μm. With this aim a complex optical alignment system has been designed, which is composed of three parts that correspond to the main parts of the detector: the alignment of the barre l muon chambers, the alignment of the end cap muon chambers, and the link between both chambers and the inner tracker sub-detector. The total number of elements in the three systems is around seven thousand. The purpose of the CMS optical alignment software is to analyze the data taken by all these elements and reconstruct the position of the muon chambers with respect to each other and with respect to the inner tracker reference system and to propagate the errors of the measurements to the errors in the positions of the chambers. (author)

  8. Software for the alignment of the CMS experiment at CERN

    Energy Technology Data Exchange (ETDEWEB)

    Arce, P. [Instituto de Fisica de Cantabria (Spain)

    1999-07-01

    In the CMS experiment the position of the muon chambers has to be known with precision of the order of 100 {mu}m. With this aim a complex optical alignment system has been designed, which is composed of three parts that correspond to the main parts of the detector: the alignment of the barre l muon chambers, the alignment of the end cap muon chambers, and the link between both chambers and the inner tracker sub-detector. The total number of elements in the three systems is around seven thousand. The purpose of the CMS optical alignment software is to analyze the data taken by all these elements and reconstruct the position of the muon chambers with respect to each other and with respect to the inner tracker reference system and to propagate the errors of the measurements to the errors in the positions of the chambers. (author)

  9. Optimization of the silicon sensors for the CMS tracker

    CERN Document Server

    Albergo, S; Azzi, P; Babucci, E; Bacchetta, N; Bader, A J; Bagliesi, G; Basti, A; Biggeri, U; Biino, C; Bilei, G M; Bisello, D; Boemi, D; Bosi, F; Borello, L; Braibant, S; Breuker, Horst; Unettib, M T; Bruzzi, Mara; Buffini, A; Busoni, S; Candelori, A; Caner, A; Castaldi, R; Castro, A; Catacchini, E; Checcucci, B; Ciampolini, P; Civinini, C; Costa, M; Creanza, D; D'Alessandro, R; Demaria, N; De Palma, M; Dell'Orso, R; Dutta, S; Favro, G; Fiore, L; Focardi, E; French, M; Freudenreich, Klaus; Frey, A; Friedl, M; Fürtjes, A; Giassi, A; Giorgi, M A; Giraldo, A; Glessing, W D; Gu, W H; Hall, G; Hammarström, R; Hebbeker, T; Honkanen, A; Honma, A; Hrubec, Josef; Huhtinen, M; Kaminski, A; Karimäki, V; König, S; Krammer, Manfred; Lariccia, P; Lenzi, M; Loreti, M; Lübelsmeyer, K; Lustermann, W; Mättig, P; Maggi, G; Mannelli, M; Mantovani, G C; Marchioro, A; Mariotti, C; Martignon, G; McEvoy, B; Meschini, M; Messineo, A; Migliore, E; My, S; Neviani, A; Paccagella, A; Palla, Fabrizio; Pandoulas, D; Papi, A; Parrini, G; Passeri, D; Pernicka, Manfred; Pieri, M; Piperov, S; Potenza, R; Radicci, V; Raffaelli, F; Raymond, M; Siedling, R; Silvestris, L; Starodumov, Andrei; Stavitski, I; Surrow, B; Tempesta, P; Tonelli, G; Tricomi, A; Tuominiemi, Jorma; Tuuva, T; Verdini, P G; Viertel, Gert M; Xie, Z; Yahong, L; Watts, S; Wittmer, B

    2001-01-01

    The CMS experiment at the LHC will comprise a large silicon strip tracker. This article highlights some of the results obtained in the R&D studies for the optimization of its silicon sensors. Measurements of the capacitances and of the high voltage stability of the devices are presented before and after irradiation to the dose expected after the full lifetime of the tracker. (7 refs).

  10. Data Quality Monitoring for the CMS Silicon Tracker

    CERN Document Server

    Dutta, S; Mennea, Maria Santa; Zito, G

    2006-01-01

    The CMS silicon tracker, consisting of about 17,000 detector modules and divided into micro-strip and pixel sensors, will be the largest silicon tracker ever realized for high energy physics experiments. The detector performance will be monitored using applications based on the CMS Data Quality Monitoring\\,(DQM) framework and running on the High-Level Trigger Farm as well as local DAQ systems. The monitorable quantities of this large number of modules are divided into hierarchical structures reflecting the detector sections. In addition, they are organized into structures corresponding to the levels of data processing. The information produced are delivered to client applications according to their subscription requests. The client applications summarize and visualize the quantities received. We describe here the functionalities of the CMS tracker DQM applications and report preliminary performance tests.

  11. The Data Quality Monitoring for the CMS Silicon Strip Tracker

    CERN Document Server

    Adler, V; Bainbridge, R; Benucci, L; Borgia, M A; Borrello, L; Cole, J; Cripps, N; Delmeire, E; Dero, V; Dutta, S; Giordano, D; Hammad, G H; Hashemi, H; Le Bihan, A C; Le Bourgeois, M; Palmonari, F; Pierro, A; Zito, G

    2009-01-01

    The CMS Silicon Strip Tracker (SST), consisting of more than 10 million channels, is organized in about 15,000 detector modules and it is the largest silicon strip tracker ever built for high energy physics experiments. The Data Quality Monitoring system for the Tracker has been developed within the CMS Software framework. More than 100,000 monitorable quantities need to be managed by the DQM system that organizes them in a hierarchical structure reflecting the detector arrangement in subcomponents and the various levels of data processing. Monitorable quantities computed at the level of individual detectors are processed to extract automatic quality checks and summary results that can be visualized with specialized graphical user interfaces. In view of the great complexity of the CMS Tracker detector the standard visualization tools based on histograms have been complemented with 2 and 3 dimensional graphical images of the subdetector that can show the whole detector down to single channel resolution. The fu...

  12. Alignment of the CMS silicon strip tracker during stand-alone commissioning

    Energy Technology Data Exchange (ETDEWEB)

    Adam, W.; et al.

    2009-07-01

    The results of the CMS tracker alignment analysis are presented using the data from cosmic tracks, optical survey information, and the laser alignment system at the Tracker Integration Facility at CERN. During several months of operation in the spring and summer of 2007, about five million cosmic track events were collected with a partially active CMS Tracker. This allowed us to perform first alignment of the active silicon modules with the cosmic tracks using three different statistical approaches; validate the survey and laser alignment system performance; and test the stability of Tracker structures under various stresses and temperatures ranging from +15C to -15C. Comparison with simulation shows that the achieved alignment precision in the barrel part of the tracker leads to residual distributions similar to those obtained with a random misalignment of 50 (80) microns in the outer (inner) part of the barrel.

  13. Alignment of the CMS Silicon Strip Tracker during stand-alone Commissioning

    CERN Document Server

    Adam, W; Dragicevic, M; Friedl, M; Frühwirth, R; Hansel, S; Hrubec, J; Krammer, M; Oberegger, M; Pernicka, M; Schmid, S; Stark, R; Steininger, H; Uhl, D; Waltenberger, W; Widl, E; Van Mechelen, P; Cardaci, M; Beaumont, W; de Langhe, E; de Wolf, E A; Delmeire, E; Hashemi, M; Bouhali, O; Charaf, O; Clerbaux, B; Dewulf, J P; Elgammal, S; Hammad, G; de Lentdecker, G; Marage, P; Vander Velde, C; Vanlaer, P; Wickens, J; Adler, V; Devroede, O; De Weirdt, S; D'Hondt, J; Goorens, R; Heyninck, J; Maes, J; Mozer, Matthias Ulrich; Tavernier, S; Van Lancker, L; Van Mulders, P; Villella, I; Wastiels, C; Bonnet, J L; Bruno, G; De Callatay, B; Florins, B; Giammanco, A; Gregoire, G; Keutgen, Th; Kcira, D; Lemaitre, V; Michotte, D; Militaru, O; Piotrzkowski, K; Quertermont, L; Roberfroid, V; Rouby, X; Teyssier, D; daubie, E; Anttila, E; Czellar, S; Engström, P; Härkönen, J; Karimäki, V; Kostesmaa, J; Kuronen, A; Lampén, T; Lindén, T; Luukka, P R; Mäenää, T; Michal, S; Tuominen, E; Tuominiemi, J; Ageron, M; Baulieu, G; Bonnevaux, A; Boudoul, G; Chabanat, E; Chabert, E; Chierici, R; Contardo, D; Della Negra, R; Dupasquier, T; Gelin, G; Giraud, N; Guillot, G; Estre, N; Haroutunian, R; Lumb, N; Perries, S; Schirra, F; Trocme, B; Vanzetto, S; Agram, J L; Blaes, R; Drouhin, F; Ernenwein, J P; Fontaine, J C; Berst, J D; Brom, J M; Didierjean, F; Goerlach, U; Graehling, P; Gross, L; Hosselet, J; Juillot, P; Lounis, A; Maazouzi, C; Olivetto, C; Strub, R; Van Hove, P; Anagnostou, G; Brauer, R; Esser, H; Feld, L; Karpinski, W; Klein, K; Kukulies, C; Olzem, J; Ostapchuk, A; Pandoulas, D; Pierschel, G; Raupach, F; Schael, S; Schwering, G; Sprenger, D; Thomas, M; Weber, M; Wittmer, B; Wlochal, M; Beissel, F; Bock, E; Flugge, G; Gillissen, C; Hermanns, T; Heydhausen, D; Jahn, D; Kaussen, G; Linn, A; Perchalla, L; Poettgens, M; Pooth, O; Stahl, A; Zoeller, M H; Buhmann, P; Butz, E; Flucke, G; Hamdorf, R; Hauk, J; Klanner, R; Pein, U; Schleper, P; Steinbrück, G; Blüm, P; De Boer, W; Dierlamm, A; Dirkes, G; Fahrer, M; Frey, M; Furgeri, A; Hartmann, F; Heier, S; Hoffmann, K H; Kaminski, J; Ledermann, B; Liamsuwan, T; Müller, S; Müller, Th; Schilling, F P; Simonis, H J; Steck, P; Zhukov, V; Cariola, P; De Robertis, G; Ferorelli, R; Fiore, L; Preda, M; Sala, G; Silvestris, L; Tempesta, P; Zito, G; Creanza, D; De Filippis, N; De Palma, M; Giordano, D; Maggi, G; Manna, N; My, S; Selvaggi, G; Albergo, S; Chiorboli, M; Costa, S; Galanti, M; Giudice, N; Guardone, N; Noto, F; Potenza, R; Saizu, M A; Sparti, V; Sutera, C; Tricomi, A; Tuve, C; Brianzi, M; Civinini, C; Maletta, F; Manolescu, F; Meschini, M; Paoletti, S; Sguazzoni, G; Broccolo, B; Ciulli, V; D'Alessandro, R; Focardi, E; Frosali, S; Genta, C; Landi, G; Lenzi, P; Macchiolo, A; Magini, N; Parrini, G; Scarlini, E; Cerati, G; Azzi, P; Bacchetta, N; Candelori, A; Dorigo, T; Kaminsky, A; Karaevski, S; Khomenkov, V; Reznikov, S; Tessaro, M; Bisello, D; De Mattia, M; Giubilato, P; Loreti, M; Mattiazzo, S; Nigro, M; Paccagnella, A; Pantano, D; Pozzobon, N; Tosi, M; Bilei, G M; Checcucci, B; Fanò, L; Servoli, L; Ambroglini, F; Babucci, E; Benedetti, D; Biasini, M; Caponeri, B; Covarelli, R; Giorgi, M; Lariccia, P; Mantovani, G; Marcantonini, M; Postolache, V; Santocchia, A; Spiga, D; Bagliesi, G; Balestri, G; Berretta, L; Bianucci, S; Boccali, T; Bosi, F; Bracci, F; Castaldi, R; Ceccanti, M; Cecchi, R; Cerri, C; Cucoanes, A S; Dell'Orso, R; Dobur, D; Dutta, S; Giassi, A; Giusti, S; Kartashov, D; Kraan, A; Lomtadze, T; Lungu, G A; Magazzu, G; Mammini, P; Mariani, F; Martinelli, G; Moggi, A; Palla, F; Palmonari, F; Petragnani, G; Profeti, A; Raffaelli, F; Rizzi, D; Sanguinetti, G; Sarkar, S; Sentenac, D; Serban, A T; Slav, A; Soldani, A; Spagnolo, P; Tenchini, R; Tolaini, S; Venturi, A; Verdini, P G; Vos, M; Zaccarelli, L; Avanzini, C; Basti, A; Benucci, L; Bocci, A; Cazzola, U; Fiori, F; Linari, S; Massa, M; Messineo, A; Segneri, G; Tonelli, G; Azzurri, P; Bernardini, J; Borrello, L; Calzolari, F; Foà, L; Gennai, S; Ligabue, F; Petrucciani, G; Rizzi, A; Yang, Z; Benotto, F; Demaria, N; Dumitrache, F; Farano, R; Borgia, M A; Castello, R; Costa, M; Migliore, E; Romero, A; Abbaneo, D; Abbas, M; Ahmed, I; Akhtar, I; Albert, E; Bloch, C; Breuker, H; Butt, S; Buchmuller, O; Cattai, A; Delaere, C; Delattre, M; Edera, L M; Engstrom, P; Eppard, M; Gateau, M; Gill, K; Giolo-Nicollerat, A S; Grabit, R; Honma, A; Huhtinen, M; Kloukinas, K; Kortesmaa, J; Kottelat, L J; Kuronen, A; Leonardo, N; Ljuslin, C; Mannelli, M; Masetti, L; Marchioro, A; Mersi, S; Michal, S; Mirabito, L; Muffat-Joly, J; Onnela, A; Paillard, C; Pal, I; Pernot, J F; Petagna, P; Petit, P; Piccut, C; Pioppi, M; Postema, H; Ranieri, R; Ricci, D; Rolandi, G; Ronga, F; Sigaud, C; Syed, A; Siegrist, P; Tropea, P; Troska, J; Tsirou, A; Vander Donckt, M; Vasey, F; Alagoz, E; Amsler, Claude; Chiochia, V; Regenfus, Christian; Robmann, P; Rochet, J; Rommerskirchen, T; Schmidt, A; Steiner, S; Wilke, L; Church, I; Cole, J; Coughlan, J; Gay, A; Taghavi, S; Tomalin, I; Bainbridge, R; Cripps, N; Fulcher, J; Hall, G; Noy, M; Pesaresi, M; Radicci, V; Raymond, D M; Sharp, P; Stoye, M; Wingham, M; Zorba, O; Goitom, I; Hobson, P R; Reid, I; Teodorescu, L; Hanson, G; Jeng, G Y; Liu, H; Pasztor, G; Satpathy, A; Stringer, R; Mangano, B; Affolder, K; Affolder, T; Allen, A; Barge, D; Burke, S; Callahan, D; Campagnari, C; Crook, A; D'Alfonso, M; Dietch, J; Garberson, Jeffrey Ford; Hale, D; Incandela, H; Incandela, J; Jaditz, S; Kalavase, P; Kreyer, S; Kyre, S; Lamb, J; Mc Guinnessr, C; Mills, C; Nguyen, H; Nikolic, M; Lowette, S; Rebassoo, F; Ribnik, J; Richman, J; Rubinstein, N; Sanhueza, S; Shah, Y; Simms, L; Staszak, D; Stoner, J; Stuart, D; Swain, S; Vlimant, J R; White, D; Ulmer, K A; Wagner, S R; Bagby, L; Bhat, P C; Burkett, K; Cihangir, S; Gutsche, O; Jensen, H; Johnson, M; Luzhetskiy, N; Mason, D; Miao, T; Moccia, S; Noeding, C; Ronzhin, A; Skup, E; Spalding, W J; Spiegel, L; Tkaczyk, S; Yumiceva, F; Zatserklyaniy, A; Zerev, E; Anghel, I; Bazterra, V E; Gerber, C E; Khalatian, S; Shabalina, E; Baringer, P; Bean, A; Chen, J; Hinchey, C; Martin, C; Moulik, T; Robinson, R; Gritsan, A V; Lae, C K; Tran, N V; Everaerts, P; Hahn, K A; Harris, P; Nahn, S; Rudolph, M; Sung, K; Betchart, B; Demina, R; Gotra, Y; Korjenevski, S; Miner, D; Orbaker, D; Christofek, L; Hooper, R; Landsberg, G; Nguyen, D; Narain, M; Speer, T; Tsang, K V

    2009-01-01

    The results of the CMS tracker alignment analysis are presented using the data from cosmic tracks, optical survey information, and the laser alignment system at the Tracker Integration Facility at CERN. During several months of operation in the spring and summer of 2007, about five million cosmic track events were collected with a partially active CMS Tracker. This allowed us to perform first alignment of the active silicon modules with the cosmic tracks using three different statistical approaches; validate the survey and laser alignment system performance; and test the stability of Tracker structures under various stresses and temperatures ranging from +15C to -15C. Comparison with simulation shows that the achieved alignment precision in the barrel part of the tracker leads to residual distributions similar to those obtained with a random misalignment of 50 (80) microns in the outer (inner) part of the barrel.

  14. Track reconstruction in heavy ion collisions with the CMS silicon tracker

    CERN Document Server

    Roland, C

    2006-01-01

    The Large Hadron Collider at CERN will collide protons at \\sqrtS = 14TeV and lead ions at \\sqrt$\\S_{NN}$. The study of heavy ion collisions is an integral part of the physics program of the Compact Muon Solenoid (CMS). Central heavy ion events at LHC energies are expected to produce a multiplicity of up to 3500 charged particles per unit of rapidity. The CMS detector features a large acceptance and high resolution silicon tracker consisting of pixel and strip detector layers. We describe the algorithms used for pattern recognition in the very high track density environment of heavy ion collisions. Detailed studies using the full detector simulation and reconstruction are presented and achieved reconstruction efficiencies, fake rates and resolutions are discussed.

  15. CERN Library and Art@CMS present Artist and Painter Xavier Cortada and CMS Physicist Pete Markowitz

    CERN Multimedia

    CERN Library

    2013-01-01

    Xavier Cortada is an American artist and painter, and an artist in residence at Florida International University (FIU) College of Architecture and the Arts who also specializes in participatory art projects. His work includes art installations at the Earth’s poles to generate awareness about climate change, child welfare murals in Bolivia and peace murals in Cyprus. Xavier will be in conversation with CMS physicist Pete Markowitz, also from FIU, to discuss the participatory art piece which they developed together. The piece will be showcased in the CMS detector hall on Thursday 11 April during the experiment’s conference week. The piece promises to "engage 300 scientists from around the world in a performance art piece that transforms them into the very subatomic particles they research". It is the first piece by Art@CMS, a new project inspired by the Arts@CERN programme. Discover more about how this new piece was developed and more about Xavier’s ...

  16. The laser alignment system for the CMS silicon microstrip tracker

    OpenAIRE

    Wittmer, Bruno

    2002-01-01

    The Compact Muon Solenoid (CMS) is one of the two general purpose detectors that will be installed at the future Large Hadron Collider (LHC). For the proper operation of the CMS silicon microstrip tracker it is essential that the several sensor layers can be aligned with respect to each other with aprecision of a few hundred micron. The laser alignment system presented here has been designed for this purpose. Its goal is to measure the deformations of the mechanical support structure of the t...

  17. Effect of A Double Metal Layer on the Performance of CMS Silicon Sensors: A Preliminary Study

    CERN Document Server

    Sophonrat, Nanta

    2014-01-01

    The luminosity upgrade of the Large Hadron Collider (LHC) at CERN after 2020 requires the upgrade of the Compact Muon Solenoid (CMS) detector. The silicon strip detectors in the CMS Tracker must be able to handle the larger number of particles that come with higher energies and luminosities. One of the solutions for the high occupancy is to increase the granularity of the sensor. A second metal layer on the sensor would allow the integration of the Pitch Adapter (PA), which currently lies on the detector module, into the sensor design and make the detector design more flexible. This could also help reduce the material budget of the CMS tracker since the traditional PA is made of metal routing on top of a glass substrate. The CMS Tracker Collaboration is investigating the feasibility of the double metal scheme as one possible option and, as such, has designed some small test sensors. The test sensors have regions with, and without, double metal routing. The results from the electrical characterization and char...

  18. Beam test characterization of CMS silicon pixel detectors for the phase-1 upgrade

    International Nuclear Information System (INIS)

    The Silicon Pixel Detector forms the innermost part of the CMS tracking system and is critical to track and vertex reconstruction. Being in close proximity to the beam interaction point, it is exposed to the highest radiation levels in the silicon tracker. In order to preserve the tracking performance with the LHC luminosity increase which is foreseen for the next years, the CMS collaboration has decided to build a new pixel detector with four barrel layers mounted around a reduced diameter beam pipe, as compared to the present three layer pixel detector in the central region. A new digital version of the front-end readout chip has been designed and tested; it has increased data buffering and readout link speed to maintain high efficiency at increasing occupancy. In addition, it offers lower charge thresholds that will improve the tracking efficiency and position resolution. Single chip modules have been evaluated in the DESY electron test beam in terms of charge collection, noise, tracking efficiency and position resolution before and after irradiation with 24 GeV protons from the CERN Proton Synchroton equivalent to the fluence expected after 500 fb−1 of integrated luminosity in the fourth layer of the pixel tracker. High efficiency and an excellent position resolution have been observed which are well maintained even after the proton irradiation. The results are well described by the CMS pixel detector simulation

  19. The CMS all-silicon tracker — strategies to ensure a high quality and radiation hard silicon detector

    Science.gov (United States)

    Hartmann, Frank

    2002-02-01

    In December 1999, the CMS collaboration decided to use an all-silicon solution for the tracker. In total the CMS tracker implements 24328 silicon sensors covering an area of 206 m 2. To control a large system of this size and ensure its functionality after 10 years under LHC condition, CMS developed an elaborate design and a detailed quality assurance program.

  20. Operation and Performance of the CMS Silicon Tracker

    CERN Document Server

    Krammer, Manfred

    2011-01-01

    The presentation describes the operation of this detector in 2010 and 2011 at the LHC during proton-proton as well as heavy ion collisions. Reconstructed photon conversions and nuclear interactions are used to evaluate the material description of the tracker. The resolution and efficiency of the track and vertex reconstruction are measured with data and compared to the results from simulation. Finally, an outlook is given to the considerations towards an upgrade of the CMS silicon strip tracker for the operation at the high luminosity upgrade of the LHC. Beside the challenges to develop sensors withstanding the high radiation field, CMS is exploring options and developing solutions that would allow to include tracking information into the Level-1 trigger of CMS.

  1. Interview to Rolf Heuer, CERN Director General, on the results of the Higgs searches at ATLAS and CMS, July 4 2012

    CERN Multimedia

    CERN Video Productions

    2012-01-01

    Rolf Heuer, CERN Director General, answers questons on the results of the Higgs searches at ATLAS and CMS, July 4 2012, his personal feelings of the importance of the results and its implications on CERN and particle physics.

  2. Production Testing and Quality Assurance of CMS Silicon Microstrip Tracker Readout Chips

    CERN Document Server

    Barrillon, Pierre; Hall, Geoffrey; Leaver, James; Noah, E; Raymond, M; Bisello, Dario; Candelori, Andrea; Kaminski, A; Stefanuti, L; Tessaro, Mario; French, Marcus

    2004-01-01

    The APV25 is the 128 channel CMOS chip developed for readout of the silicon microstrip tracker in the CMS experiment at the CERN Large Hadron Collider. The detector is now under construction and will be the largest silicon microstrip system ever built, with ~200m^2 of silicon sensors. Around 10^5 chips are required to instrument the system, which must operate for about 10 years in a high radiation environment with little or no possibility of microstrip system ever built, with ~200m^2 of silicon sensors. Around 10^5 chips are required to instrument the system, which must operate for about 10 years in a high radiation environment with little or no possibility of assurance of long term performance of the readout electronics, especially verification of radiation tolerance, is highly desirable. This has been achieved by means of automated probe testing of every chip on the silicon wafers from the foundry, followed by studies of sample die to evaluate in more detail properties of the chips which cannot easily be ex...

  3. The CMS silicon microstrip detectors: research and development

    International Nuclear Information System (INIS)

    A large quantity of silicon microstrip detectors is foreseen to be used as part of the CMS tracker. A specific research and development program has been carried out with the aim of defining layouts and technological solutions suitable for the use of silicon detectors in high radiation environment. Results presented here summarise this work on many research areas such as techniques for device manufacturing, pre- and post-irradiation electrical characterization, silicon bulk defects analysis and simulations, system performance analytical calculations and simulations and test beam analysis. As a result of this work we have chosen to use single-sided, AC-coupled, poly silicon biased, 300 μm thick, p+ on n substrate detectors. We feel confident that these devices will match the required performances for the CMS tracker provided they can be operated at bias voltages as high as 500 V. Such high-voltage devices have been successfully manufactured and we are now concentrating our efforts in enhancing yield and reliability

  4. Testing and development of the CMS silicon tracker front-end readout electronics

    CERN Document Server

    Leaver, James D G

    2006-01-01

    The Compact Muon Solenoid (CMS) is a general purpose detector that will operate at the CERN Large Hadron Collider (LHC), a particle accelerator designed for the study of new physics at the TeV energy scale. A key component of CMS is the Silicon Tracker, which has ~9.3 million detector channels and is expected to generate over 70% of the total CMS data volume. The Tracker readout system must process data at a rate that is orders of magnitude higher than in any previous particle physics experiment. On-detector readout is performed by the APV25 front end chip. To ensure a Tracker of the highest quality and efficiency, each APV25 must be rigorously verified; a wafer probing test station has been developed for post production quality assurance. The APV25 contains internal pipelines which buffer event data pending readout. An APV Emulator has been designed to prevent APV25 buffer overflow due to random fluctuations in the Level 1 trigger rate. The first stage of the off-detector readout is performed by the Front En...

  5. Integration of the End Cap TEC+ of the CMS Silicon Strip Tracker

    CERN Document Server

    Bremer, Richard; Feld, Lutz

    2008-01-01

    At the European Organization for Nuclear Research (CERN) ne ar Geneva the new proton-proton collider ring LHC and the experiments that will be operated a t this accelerator are currently being finalised. Among these experiments is the multi-purpose det ector CMS whose aim it is to discover and investigate new physical phenomena that might become ac cessible by virtue of the high center- of-mass energy and luminosity of the LHC. Two of the most inte nsively studied possibilities are the discovery of the Higgs Boson and of particles from the spectr um of supersymmetric extensions of the Standard Model. CMS is the first large experiment of high- energy particle physics whose inner tracking system is exclusively instrumented with silicon d etector modules. This tracker comprises 15 148 silicon strip modules enclosing the interaction poin t in 10–12 layers. The 1. Physikalisches Institut B of RWTH Aachen was deeply involved in the completi on of the end caps of the tracking system. The institute played a leading...

  6. Beam loss studies on silicon strip detector modules for the CMS experiment

    CERN Document Server

    Fahrer, Manuel

    2006-01-01

    The large beam energy of the LHC demands for a save beam abort system. Nevertheless, failures cannot be excluded with last assurance and are predicted to occur once per year. As the CMS experiment is placed in the neighboured LHC octant, it is affected by such events. The effect of an unsynchronized beam abort on the silicon strip modules of the CMS tracking detector has been investigated in this thesis by performing one accelerator and two lab experiments. The dynamical behaviour of operational parameters of modules and components has been recorded during simulated beam loss events to be able to disentangle the reasons of possible damages. The first study with high intensive proton bunches at the CERN PS ensured the robustness of the module design against beam losses. A further lab experiment with pulsed IR LEDs clarified the physical and electrical processes during such events. The silicon strip sensors on a module are protected against beam losses by a part of the module design that originally has not been...

  7. The R and D program for silicon detectors in CMS

    International Nuclear Information System (INIS)

    This paper describes the main achievements in the development of radiation resistant silicon detectors to be used in the CMS tracker. After a general description of the basic requirements for the operation of large semiconductor systems in the LHC environment, the issue of radiation resistance is discussed in detail. Advantages and disadvantages of the different technological options are presented for comparison. Laboratory measurements and test beam data are used to check the performance of several series of prototypes fabricated by different companies. The expected performance of the final detector modules are presented together with preliminary test beam results on system prototypes. (author)

  8. New results on silicon microstrip detectors of CMS tracker

    International Nuclear Information System (INIS)

    Interstrip and backplane capacitances on silicon microstrip detectors with p+ strip on n substrate of 320 μm thickness were measured for pitches between 60 and 240 μm and width over pitch ratios between 0.13 and 0.5. Parametrisations of capacitance w.r.t. pitch and width were compared with data. The detectors were measured before and after being irradiated to a fluence of 4x1014 protons/cm2 of 24 GeV/c momentum. The effect of the crystal orientation of the silicon has been found to have a relevant influence on the surface radiation damage, favouring the choice of a substrate. Working at high bias (up to 500 V in CMS) might be critical for the stability of detector, for a small width over pitch ratio. The influence found to enhance the stability

  9. Planar silicon sensors for the CMS Tracker upgrade

    CERN Document Server

    Junkes, Alexandra

    2013-01-01

    The CMS tracker collaboration has initiated a large material investigation and irradiation campaign to identify the silicon material and design that fulfills all requirements for detectors for the high-luminosity phase of the Large Hadron Collider (HL-LHC).A variety of silicon p-in-n and n-in-p test-sensors made from Float Zone, Deep-Diffused FZ and Magnetic Czochralski materials were manufactured by one single industrial producer, thus guaranteeing similar conditions for the production and design of the test-structures. Properties of different silicon materials and design choices have been systematically studied and compared.The samples have been irradiated with 1 MeV neutrons and protons corresponding to maximal fluences as expected for the positions of detector layers in the future tracker. Irradiations with protons of different energies (23 MeV and 23 GeV) have been performed to evaluate the energy dependence of the defect generation in oxygen rich material. All materials have been characterized before an...

  10. Analysis of the Laser Calibration System for the CMS HCAL at CERN's Large Hadron Collider

    Science.gov (United States)

    Lebolo, Luis

    2005-11-01

    The European Organization for Nuclear Physics' (CERN) Large Hadron Collider uses the Compact Muon Solenoid (CMS) detector to measure collision products from proton-proton interactions. CMS uses a hadron calorimeter (HCAL) to measure the energy and position of quarks and gluons by reconstructing their hadronic decay products. An essential component of the detector is the calibration system, which was evaluated in terms of its misalignment, linearity, and resolution. In order to analyze the data, the authors created scripts in ROOT 5.02/00 and C++. The authors also used Mathematica 5.1 to perform complex mathematics and AutoCAD 2006 to produce optical ray traces. The misalignment of the optical components was found to be satisfactory; the Hybrid Photodiodes (HPDs) were confirmed to be linear; the constant, noise and stochastic contributions to its resolution were analyzed; and the quantum efficiency of most HPDs was determined to be approximately 40%. With a better understanding of the laser calibration system, one can further understand and improve the HCAL.

  11. Design and Simulation of the First Level Global Muon Trigger for the CMS Experiment at CERN

    CERN Document Server

    Sakulin, Hannes

    2002-01-01

    The present thesis deals with the First Level Global Muon Trigger (GMT) for the Compact Muon Solenoid (CMS) Experiment at the Large Hadron Collider (LHC) of the European Particle Physics Laboratory CERN. The First Level Trigger electronics reduce the event rate from 40MHz (bunch crossing rate of the LHC) to 100 kHz, the maximal input rate of the higher level triggers, by selecting potentially interesting events on the basis of coarsely segmented data from the calorimeters and the three muon systems in CMS. It is the task of the GMT to combine independent measurements of regional triggers in each of the muon systems and to determine the best four muons in the entire detector for each bunch crossing. In order to apply isolation criteria and to achieve confirmation by the calorimeter the GMT further correlates muon measurements with regions in the calorimeter. The GMT algorithms were elaborated with the help of detailed simulations of the detector and trigger system. The logic design of the main GMT electronics ...

  12. Design, Construction and Commissioning of the CMS Tracker at CERN and Proposed Improvements for Detectors at the Future International Linear Collider

    CERN Document Server

    Bergauer, T

    The CMS (Compact Muon Solenoid) detector is a huge particle physics experiment located at one of the four proton-proton interaction points of the Large Hadron Collider (LHC) at CERN, the European Organization for Nuclear Research (Geneva, Switzerland). With 27 km circumference it is the not only the largest particle accelerator in size, but with a center of mass energy of 2x7 TeV it will also set the world record in terms of energy. The inner tracking system of the CMS experiment has a diameter of 2.4 m and a length of 5.4 m and is representing the largest silicon tracker ever built. About 15,000 detector modules consisting of more than 24,000 silicon sensors create a silicon area of 206 m2 to detect charged particles from proton collisions. They are placed on a rigid carbon fibre structure in the center of the experiment, and have to operate reliably within a harsh radiation environment and the working conditions of a 3.8 Tesla solenoid magnetic field at -10 degree C temperature. This thesis was conducted ...

  13. The Honourable Lawrence Gonzi Prime Minister of Malta visiting CMS experiment on 10 January 2008, from left to right Ministry of Finance Permanent Secretary A. Camilleri, Ambassador V. Camilleri, Maltese Representative at CERN N. Sammut, Prime Minister L. Gonzi, CMS Collaboration Spokesperson T. Virdee, CERN Director-General R. Aymar, University of Malta Rector J. Camilleri, Adviser to Director-General E. Tsesmelis.

    CERN Multimedia

    Maximilien Brice

    2008-01-01

    The Honourable Lawrence Gonzi Prime Minister of Malta visiting CMS experiment on 10 January 2008, from left to right Ministry of Finance Permanent Secretary A. Camilleri, Ambassador V. Camilleri, Maltese Representative at CERN N. Sammut, Prime Minister L. Gonzi, CMS Collaboration Spokesperson T. Virdee, CERN Director-General R. Aymar, University of Malta Rector J. Camilleri, Adviser to Director-General E. Tsesmelis.

  14. New results on silicon microstrip detectors of CMS tracker

    CERN Document Server

    Demaria, N; Angarano, M M; Azzi, P; Babucci, E; Bacchetta, N; Bader, A J; Bagliesi, G; Basti, A; Biggeri, U; Bilei, G M; Bisello, D; Boemi, D; Bölla, G; Bosi, F; Borello, L; Bortoletto, Daniela; Bozzi, C; Braibant, S; Breuker, Horst; Bruzzi, Mara; Buffini, A; Busoni, S; Candelori, A; Caner, A; Castaldi, R; Castro, A; Catacchini, E; Checcucci, B; Ciampolini, P; Civinini, C; Creanza, D; D'Alessandro, R; Da Rold, M; De Palma, M; Dell'Orso, R; Della Marina, R; Dutta, S; Eklund, C; Peisert, Anna; Favro, G; Feld, L; Fiore, L; Focardi, E; French, M; Freudenreich, Klaus; Fürtjes, A; Giassi, A; Giorgi, M A; Giraldo, A; Glessing, B; Gu, W H; Hall, G; Hammarström, R; Hebbeker, T; Hrubec, Josef; Huhtinen, M; Kaminski, A; Karimäki, V; Saint-Koenig, M; Krammer, Manfred; Lariccia, P; Lenzi, M; Loreti, M; Lübelsmeyer, K; Lustermann, W; Mättig, P; Maggi, G; Mannelli, M; Mantovani, G C; Marchioro, A; Mariotti, C; Martignon, G; McEvoy, B; Meschini, M; Messineo, A; Migliore, E; My, S; Paccagnella, A; Palla, Fabrizio; Pandoulas, D; Papi, A; Parrini, G; Passeri, D; Pieri, M; Piperov, S; Potenza, R; Radicci, V; Raffaelli, F; Raymond, M; Santocchia, A; Schmitt, B; Selvaggi, G; Servoli, L; Sguazzoni, G; Siedling, R; Silvestris, L; Skog, K; Starodumov, Andrei; Stavitski, I; Stefanini, G; Tempesta, P; Tonelli, G; Tricomi, A; Tuuva, T; Vannini, C; Verdini, P G; Viertel, Gert M; Xie, Z; Li, Y; Watts, S; Wittmer, B

    2000-01-01

    Interstrip and backplane capacitances on silicon microstrip detectors with pf strip on n substrate of 320 mu m thickness were measured for pitches between 60 and 240 mu m and width over pitch ratios between 0.13 and 0.5. Parametrisations of capacitance w.r.t. pitch and width were compared with data. The detectors were measured before and after being irradiated to a fluence of 4*10/sup 14/ protons/cm/sup 2/ of 24 GeV/e momentum. The effect of the crystal orientation of the silicon has been found to have a relevant influence on the surface radiation damage, favouring the choice of a (100) substrate. Working at high bias (up to 500 V in CMS) might be critical for the stability of detector, for a small width over pitch ratio. The influence of having a metal strip larger than the p/sup +/ implant has been studied and found to enhance the stability. (7 refs).

  15. Development of a Test System for the Quality Assurance of Silicon Microstrip Detectors for the Inner Tracking System of the CMS Experiment

    CERN Document Server

    Axer, Markus

    2003-01-01

    The inner tracking system of the Compact Muon Solenoid (CMS) experiment at the Large Hadron Collider (LHC) which is being built at the European Laboratory for Particle Physics CERN (Geneva, Switzerland) will be equipped with two different technologies of silicon detectors. While the innermost tracker will be composed of silicon pixel detectors, silicon microstrip detectors are envisaged for the outer tracker architecture. The silicon microstrip tracker will house about 15,000 single detector modules each composed of a set of silicon sensors, the readout electronics (front end hybrid), and a support frame. It will provide a total active area of 198 m2 and ten million analogue channels read out at the collider frequency of 40 MHz. This large number of modules to be produced and integrated into the tracking system is an unprecedented challenge involving industrial companies and various research institutes from many different countries. This thesis deals with the physics of silicon sensors and the preparation of ...

  16. Amorphous Silicon Position Detectors for the Link Alignment System of the CMS Detector: Users Handbook

    Energy Technology Data Exchange (ETDEWEB)

    Calderon, A.; Gomez, G.; Gonzalez-Sanchez, F. J.; Martinez-Rivero, C.; Matorras, F.; Rodrigo, T.; Ruiz-Arbol, P.; Scodellaro, L.; Vila, I.; Virto, A. L.; Alberdi, J.; Arce, P.; Barcala, J.M.; Calvo, E.; Ferrando, A.; Josa, M. I.; Molinero, A.; Navarrete, J.; Oller, J. C.; Yuste, C.

    2007-07-01

    We present the general characteristics, calibration procedures and measured performance of the Amorphous Silicon Position Detectors installed in the Link Alignment System of the CMS Detector for laser beam detection and reconstruction and give the Data Base to be used as a Handbook during CMS operation. (Author) 10 refs.

  17. Amorphous Silicon Position Detectors for the Link Alignment System of the CMS Detector: Users Handbook

    International Nuclear Information System (INIS)

    We present the general characteristics, calibration procedures and measured performance of the Amorphous Silicon Position Detectors installed in the Link Alignment System of the CMS Detector for laser beam detection and reconstruction and give the Data Base to be used as a Handbook during CMS operation. (Author) 10 refs

  18. Validation of the Read Out Electronics for the CMS Muon Drift Chambers at Tests Beam in CERN/GIF

    International Nuclear Information System (INIS)

    Part of the readout system for the CMS muon drift chambers has been tested in test beams at CERN/GIF. Read Out Board (ROB) and HPTD have been validated with signals from a real muon beam, with an structure and flux similar to LHC operating conditions and using one of the chambers produced in CIEMAT already located in the test beam area under normal gas and voltage conditions. (Author) 5 refs

  19. Validation of the Read Out Electronics for the CMS Muon Drift Chambers at Tests Beam in CERN/GIF

    CERN Document Server

    Fernández, C; Fouz-Iglesias, M C; Marin, J; Oller, J C; Willmott, C

    2002-01-01

    Part of the readout system for the CMS muon drift chambers has been tested in test beams at CERN/GIF. Read Out Board (ROB) and HPTD have been validated with signals from a real muon beam, with an structure and flux similar to LHC operating conditions and using one of the chambers produced in CIEMAT already located in the test beam area under normal gas and voltage conditions. (Author) 5 refs.

  20. An Integrated Testing Facility for the Global Trigger of the CMS Experiment at CERN

    CERN Document Server

    Themel, Thomas; Wulz, Claudia-Elisabeth

    2010-01-01

    The Global Trigger is part of the Level-1 Trigger of the CMS experiment at CERN, with the task to find the most interesting events corresponding to a rate of 100 kHz from the basic Large Hadron Collider interaction rate of 40 MHz. It is expected to render a decision within 3:2 $\\mu$s, which necessitates an implementation using custom hardware. The implementation makes heavy use of Field Programmable Gate Array (FPGA) technology to reconcile the performance requirements with the need for exibility. The complexity of the Global Trigger system (13 boards with 51 FPGA chips) makes it vulnerable to a multitude of errors, from electrical errors such as bad solder joints or plug contacts up to logical errors in the implementation of the firmrmware and the configuration software. The goal of the work described in this thesis was to provide an integrated system that allows users to easily determine whether the system is working correctly and assists experts in tracking down the internal causes of such errors within th...

  1. Design, construction and commissioning of the Thermal Screen Control System for the CMS Tracker detector at CERN

    CERN Document Server

    Carrone, E; Tsirou, A

    The CERN (European Organization for Nuclear Research) laboratory is currently building the Large Hadron Collider (LHC). Four international collaborations have designed (and are now constructing) detectors able to exploit the physics potential of this collider. Among them is the Compact Muon Solenoid (CMS), a general purpose detector optimized for the search of Higgs boson and for physics beyond the Standard Model of fundamental interactions between elementary particles. This thesis presents, in particular, the design, construction, commissioning and test of the control system for a screen that provides a thermal separation between the Tracker and ECAL (Electromagnetic CALorimeter) detector of CMS (Compact Muon Solenoid experiment). Chapter 1 introduces the new challenges posed by these installations and deals, more in detail, with the Tracker detector of CMS. The size of current experiments for high energy physics is comparable to that of a small industrial plant: therefore, the techniques used for controls a...

  2. CMS silicon strip tracker calibration workflow and tools

    International Nuclear Information System (INIS)

    The silicon strip tracker of CMS is by far the biggest detector of its kind ever operated. Its 15 000 detector modules and 9 million readout channels are individually calibrated in order to achieve the optimal data quality for the experiment. Software tools were designed to automate the operations and reduce the need for maintenance as much as possible, taking care to use pre-existing software frameworks, when possible. The calibration software implements a dedicated scheme of event building, on-line distributed analysis, storage management, data analysis and configuration archival. Dedicated user interfaces and web-applications were developed to ease the operations, speed-up the calibration process, monitor its quality, and track the problems. A complete set of monitoring analyses are also performed online during data taking to validate the data acquired. The calibration parameters are measured continuously, and the values are fed back to the calibration database in order to refine the on-line event reconstruction. A review of the software tools and calibration processes is given here and the obtained results are discussed.

  3. Commissioning and Performance of the CMS Silicon Strip Tracker with Cosmic Ray Muons

    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; Dimitrov, L; Genchev, V; Iaydjiev, P; Piperov, S; Stoykova, S; Sultanov, G; Trayanov, R; Vankov, I; Dimitrov, A; Dyulendarova, M; Kozhuharov, V; Litov, L; Marinova, E; Mateev, M; Pavlov, B; Petkov, P; Toteva, Z; Chen, G M; Chen, H S; Guan, W; Jiang, C H; Liang, D; Liu, B; Meng, X; Tao, J; Wang, J; Wang, Z; Xue, Z; Zhang, Z; Ban, Y; Cai, J; Ge, Y; Guo, S; Hu, Z; Mao, Y; Qian, S J; Teng, H; Zhu, B; Avila, C; Baquero Ruiz, M; Carrillo Montoya, C A; Gomez, A; Gomez Moreno, B; Ocampo Rios, A A; Osorio Oliveros, A F; Reyes Romero, D; Sanabria, J C; Godinovic, N; Lelas, K; Plestina, R; Polic, D; Puljak, I; Antunovic, Z; Dzelalija, M; Brigljevic, V; Duric, S; Kadija, K; Morovic, S; Fereos, R; Galanti, M; Mousa, J; Papadakis, A; Ptochos, F; Razis, P A; Tsiakkouri, D; Zinonos, Z; Hektor, A; Kadastik, M; Kannike, K; Müntel, M; Raidal, M; Rebane, L; Anttila, E; Czellar, S; Härkönen, J; Heikkinen, A; Karimäki, V; Kinnunen, R; Klem, J; Kortelainen, M J; Lampén, T; Lassila-Perini, K; Lehti, S; Lindén, T; Luukka, P; Mäenpää, T; Nysten, J; Tuominen, E; Tuominiemi, J; Ungaro, D; Wendland, L; Banzuzi, K; Korpela, A; Tuuva, T; Nedelec, P; Sillou, D; Besancon, M; Chipaux, R; Dejardin, M; Denegri, D; Descamps, J; Fabbro, B; Faure, J L; Ferri, F; Ganjour, S; Gentit, F X; Givernaud, A; Gras, P; Hamel de Monchenault, G; Jarry, P; Lemaire, M C; Locci, E; Malcles, J; Marionneau, M; Millischer, L; Rander, J; Rosowsky, A; Rousseau, D; Titov, M; Verrecchia, P; Baffioni, S; Bianchini, L; Bluj, M; Busson, P; Charlot, C; Dobrzynski, L; Granier de Cassagnac, R; Haguenauer, M; Miné, P; Paganini, P; Sirois, Y; Thiebaux, C; Zabi, A; Agram, J L; Besson, A; Bloch, D; Bodin, D; Brom, J M; Conte, E; Drouhin, F; Fontaine, J C; Gelé, D; Goerlach, U; Gross, L; Juillot, P; Le Bihan, A C; Patois, Y; Speck, J; Van Hove, P; Baty, C; Bedjidian, M; Blaha, J; Boudoul, G; Brun, H; Chanon, N; Chierici, R; Contardo, D; Depasse, P; Dupasquier, T; El Mamouni, H; Fassi, F; Fay, J; Gascon, S; Ille, B; Kurca, T; Le Grand, T; Lethuillier, M; Lumb, N; Mirabito, L; Perries, S; Vander Donckt, M; Verdier, P; Djaoshvili, N; Roinishvili, N; Roinishvili, V; Amaglobeli, N; Adolphi, R; Anagnostou, G; Brauer, R; Braunschweig, W; Edelhoff, M; Esser, H; Feld, L; Karpinski, W; Khomich, A; Klein, K; Mohr, N; Ostaptchouk, A; Pandoulas, D; Pierschel, G; Raupach, F; Schael, S; Schultz von Dratzig, A; Schwering, G; Sprenger, D; Thomas, M; Weber, M; Wittmer, B; Wlochal, M; Actis, O; Altenhöfer, G; Bender, W; Biallass, P; Erdmann, M; Fetchenhauer, G; Frangenheim, J; Hebbeker, T; Hilgers, G; Hinzmann, A; Hoepfner, K; Hof, C; Kirsch, M; Klimkovich, T; Kreuzer, P; Lanske, D; Merschmeyer, M; Meyer, A; Philipps, B; Pieta, H; Reithler, H; Schmitz, S A; Sonnenschein, L; Sowa, M; Steggemann, J; Szczesny, H; Teyssier, D; Zeidler, C; Bontenackels, M; Davids, M; Duda, M; Flügge, G; Geenen, H; Giffels, M; Haj Ahmad, W; Hermanns, T; Heydhausen, D; Kalinin, S; Kress, T; Linn, A; Nowack, A; Perchalla, L; Poettgens, M; Pooth, O; Sauerland, P; Stahl, A; Tornier, D; Zoeller, M H; Aldaya Martin, M; Behrens, U; Borras, K; Campbell, A; Castro, E; Dammann, D; Eckerlin, G; Flossdorf, A; Flucke, G; Geiser, A; Hatton, D; Hauk, J; Jung, H; Kasemann, M; Katkov, I; Kleinwort, C; Kluge, H; Knutsson, A; Kuznetsova, E; Lange, W; Lohmann, W; Mankel, R; Marienfeld, M; Meyer, A B; Miglioranzi, S; Mnich, J; Ohlerich, M; Olzem, J; Parenti, A; Rosemann, C; Schmidt, R; Schoerner-Sadenius, T; Volyanskyy, D; Wissing, C; Zeuner, W D; Autermann, C; Bechtel, F; Draeger, J; Eckstein, D; Gebbert, U; Kaschube, K; Kaussen, G; Klanner, R; Mura, B; Naumann-Emme, S; Nowak, F; Pein, U; Sander, C; Schleper, P; Schum, T; Stadie, H; Steinbrück, G; Thomsen, J; Wolf, R; Bauer, J; Blüm, P; Buege, V; Cakir, A; Chwalek, T; De Boer, W; Dierlamm, A; Dirkes, G; Feindt, M; Felzmann, U; Frey, M; Furgeri, A; Gruschke, J; Hackstein, C; Hartmann, F; Heier, S; Heinrich, M; Held, H; Hirschbuehl, D; Hoffmann, K H; Honc, S; Jung, C; Kuhr, T; Liamsuwan, T; Martschei, D; Mueller, S; Müller, Th; Neuland, M B; 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; Kaur, R; Kohli, J M; Mehta, M Z; Nishu, N; Saini, L K; Sharma, A; Singh, A; Singh, J B; Singh, S P; Ahuja, S; Arora, S; Bhattacharya, S; Chauhan, S; Choudhary, B C; Gupta, P; Jain, S; Jain, S; Jha, M; Kumar, A; Ranjan, K; Shivpuri, R K; Srivastava, A K; Choudhury, R K; Dutta, D; Kailas, S; Kataria, S K; Mohanty, A K; Pant, L M; Shukla, P; Topkar, A; Aziz, T; Guchait, M; Gurtu, A; Maity, M; Majumder, D; Majumder, G; Mazumdar, K; Nayak, A; Saha, A; Sudhakar, K; Banerjee, S; Dugad, S; Mondal, N K; Arfaei, H; Bakhshiansohi, H; Fahim, A; Jafari, A; Mohammadi Najafabadi, M; Moshaii, A; Paktinat Mehdiabadi, S; Rouhani, S; Safarzadeh, B; Zeinali, M; Felcini, M; Abbrescia, M; Barbone, L; Chiumarulo, F; Clemente, A; Colaleo, A; Creanza, D; Cuscela, G; De Filippis, N; De Palma, M; De Robertis, G; Donvito, G; Fedele, F; Fiore, L; Franco, M; Iaselli, G; Lacalamita, N; Loddo, F; Lusito, L; Maggi, G; Maggi, M; Manna, N; Marangelli, B; My, S; Natali, S; Nuzzo, S; Papagni, G; Piccolomo, S; Pierro, G A; Pinto, C; Pompili, A; Pugliese, G; Rajan, R; Ranieri, A; Romano, F; Roselli, G; Selvaggi, G; Shinde, Y; Silvestris, L; Tupputi, S; Zito, G; Abbiendi, G; Bacchi, W; Benvenuti, A C; Boldini, M; Bonacorsi, D; Braibant-Giacomelli, S; Cafaro, V D; Caiazza, S S; Capiluppi, P; Castro, A; Cavallo, F R; Codispoti, G; Cuffiani, M; D'Antone, I; Dallavalle, G M; Fabbri, F; Fanfani, A; Fasanella, D; Giacomelli, P; Giordano, V; Giunta, M; Grandi, C; Guerzoni, M; Marcellini, S; Masetti, G; Montanari, A; Navarria, F L; Odorici, F; Pellegrini, G; Perrotta, A; Rossi, A M; Rovelli, T; Siroli, G; Torromeo, G; Travaglini, R; Albergo, S; Costa, S; Potenza, R; Tricomi, A; Tuve, C; Barbagli, G; Broccolo, G; Ciulli, V; Civinini, C; D'Alessandro, R; Focardi, E; Frosali, S; Gallo, E; Genta, C; Landi, G; Lenzi, P; Meschini, M; Paoletti, S; Sguazzoni, G; Tropiano, A; Benussi, L; Bertani, M; Bianco, S; Colafranceschi, S; Colonna, D; Fabbri, F; Giardoni, M; Passamonti, L; Piccolo, D; Pierluigi, D; Ponzio, B; Russo, A; Fabbricatore, P; Musenich, R; Benaglia, A; Calloni, M; Cerati, G B; D'Angelo, P; De Guio, F; Farina, F M; Ghezzi, A; Govoni, P; Malberti, M; Malvezzi, S; Martelli, A; Menasce, D; Miccio, V; Moroni, L; Negri, P; Paganoni, M; Pedrini, D; Pullia, A; Ragazzi, S; Redaelli, N; Sala, S; Salerno, R; Tabarelli de Fatis, T; Tancini, V; Taroni, S; Buontempo, S; Cavallo, N; Cimmino, A; De Gruttola, M; Fabozzi, F; Iorio, A O M; Lista, L; Lomidze, D; Noli, P; Paolucci, P; Sciacca, C; Azzi, P; Bacchetta, N; Barcellan, L; Bellan, P; Bellato, M; Benettoni, M; Biasotto, M; Bisello, D; Borsato, E; Branca, A; Carlin, R; Castellani, L; Checchia, P; Conti, E; Dal Corso, F; De Mattia, M; Dorigo, T; Dosselli, U; Fanzago, F; Gasparini, F; Gasparini, U; Giubilato, P; Gonella, F; Gresele, A; Gulmini, M; Kaminskiy, A; Lacaprara, S; Lazzizzera, I; Margoni, M; Maron, G; Mattiazzo, S; Mazzucato, M; Meneghelli, M; Meneguzzo, A T; Michelotto, M; Montecassiano, F; Nespolo, M; Passaseo, M; Pegoraro, M; Perrozzi, L; Pozzobon, N; Ronchese, P; Simonetto, F; Toniolo, N; Torassa, E; Tosi, M; Triossi, A; Vanini, S; Ventura, S; Zotto, P; Zumerle, G; Baesso, P; Berzano, U; Bricola, S; Necchi, M M; Pagano, D; Ratti, S P; Riccardi, C; Torre, P; Vicini, A; Vitulo, P; Viviani, C; Aisa, D; Aisa, S; Babucci, E; Biasini, M; Bilei, G M; Caponeri, B; Checcucci, B; Dinu, N; Fanò, L; Farnesini, L; Lariccia, P; Lucaroni, A; Mantovani, G; Nappi, A; Piluso, A; Postolache, V; Santocchia, A; Servoli, L; Tonoiu, D; Vedaee, A; Volpe, R; Azzurri, P; Bagliesi, G; Bernardini, J; Berretta, L; Boccali, T; Bocci, A; Borrello, L; Bosi, F; Calzolari, F; Castaldi, R; Dell'Orso, R; Fiori, F; Foà, L; Gennai, S; Giassi, A; Kraan, A; Ligabue, F; Lomtadze, T; Mariani, F; Martini, L; Massa, M; Messineo, A; Moggi, A; Palla, F; Palmonari, F; Petragnani, G; Petrucciani, G; Raffaelli, F; Sarkar, S; Segneri, G; Serban, A T; Spagnolo, P; Tenchini, R; Tolaini, S; Tonelli, G; Venturi, A; Verdini, P G; Baccaro, S; Barone, L; Bartoloni, A; Cavallari, F; Dafinei, I; Del Re, D; Di Marco, E; Diemoz, M; Franci, D; Longo, E; Organtini, G; Palma, A; Pandolfi, F; Paramatti, R; Pellegrino, F; Rahatlou, S; Rovelli, C; Alampi, G; Amapane, N; Arcidiacono, R; Argiro, S; Arneodo, M; Biino, C; Borgia, M A; Botta, C; Cartiglia, N; Castello, R; Cerminara, G; Costa, M; Dattola, D; Dellacasa, G; Demaria, N; Dughera, G; Dumitrache, F; Graziano, A; Mariotti, C; Marone, M; Maselli, S; Migliore, E; Mila, G; Monaco, V; Musich, M; Nervo, M; Obertino, M M; Oggero, S; Panero, R; Pastrone, N; Pelliccioni, M; Romero, A; Ruspa, M; Sacchi, R; Solano, A; Staiano, A; Trapani, P P; Trocino, D; Vilela Pereira, A; Visca, L; Zampieri, A; Ambroglini, F; Belforte, S; Cossutti, F; Della Ricca, G; Gobbo, B; Penzo, A; Chang, S; Chung, J; Kim, D H; Kim, G N; Kong, D J; Park, H; Son, D C; Bahk, S Y; Song, S; Jung, S Y; Hong, B; Kim, H; Kim, J H; Lee, K S; Moon, D H; Park, S K; Rhee, H B; Sim, K S; Kim, J; Choi, M; Hahn, G; Park, I C; Choi, S; Choi, Y; Goh, J; Jeong, H; Kim, T J; Lee, J; Lee, S; Janulis, M; Martisiute, D; Petrov, P; Sabonis, T; Castilla Valdez, H; Sánchez Hernández, A; Carrillo Moreno, S; Morelos Pineda, A; Allfrey, P; Gray, R N C; Krofcheck, D; Bernardino Rodrigues, N; Butler, P H; Signal, T; Williams, J C; Ahmad, M; Ahmed, I; Ahmed, W; Asghar, M I; Awan, M I M; Hoorani, H R; Hussain, I; Khan, W A; Khurshid, T; Muhammad, S; Qazi, S; Shahzad, H; Cwiok, M; Dabrowski, R; Dominik, W; Doroba, K; Konecki, M; Krolikowski, J; Pozniak, K; Romaniuk, Ryszard; Zabolotny, W; Zych, P; Frueboes, T; Gokieli, R; Goscilo, L; Górski, M; Kazana, M; Nawrocki, K; Szleper, M; Wrochna, G; Zalewski, P; Almeida, N; Antunes Pedro, L; Bargassa, P; David, A; Faccioli, P; Ferreira Parracho, P G; Freitas Ferreira, M; Gallinaro, M; Guerra Jordao, M; Martins, P; Mini, G; Musella, P; Pela, J; Raposo, L; Ribeiro, P Q; Sampaio, S; Seixas, J; Silva, J; Silva, P; Soares, D; Sousa, M; Varela, J; Wöhri, H K; Altsybeev, I; Belotelov, I; Bunin, P; Ershov, Y; Filozova, I; Finger, M; Finger, M Jr; Golunov, A; Golutvin, I; Gorbounov, N; Kalagin, V; Kamenev, A; Karjavin, V; Konoplyanikov, V; Korenkov, V; Kozlov, G; Kurenkov, A; Lanev, A; Makankin, A; Mitsyn, V V; Moisenz, P; Nikonov, E; Oleynik, D; Palichik, V; Perelygin, V; Petrosyan, A; Semenov, R; Shmatov, S; Smirnov, V; Smolin, D; Tikhonenko, E; Vasil'ev, S; Vishnevskiy, A; Volodko, A; Zarubin, A; Zhiltsov, V; Bondar, N; Chtchipounov, L; Denisov, A; Gavrikov, Y; Gavrilov, G; Golovtsov, V; Ivanov, Y; Kim, V; Kozlov, V; Levchenko, P; Obrant, G; Orishchin, E; Petrunin, A; Shcheglov, Y; Shchetkovskiy, A; Sknar, V; Smirnov, I; Sulimov, V; Tarakanov, V; Uvarov, L; Vavilov, S; Velichko, G; Volkov, S; Vorobyev, A; Andreev, Yu; Anisimov, A; Antipov, P; Dermenev, A; Gninenko, S; Golubev, N; Kirsanov, M; Krasnikov, N; Matveev, V; Pashenkov, A; Postoev, V E; Solovey, A; Solovey, A; Toropin, A; Troitsky, S; Baud, A; Epshteyn, V; Gavrilov, V; Ilina, N; Kaftanov, V; Kolosov, V; Kossov, M; Krokhotin, A; Kuleshov, S; Oulianov, A; Safronov, G; Semenov, S; Shreyber, I; Stolin, V; Vlasov, E; Zhokin, A; Boos, E; Dubinin, M; Dudko, L; Ershov, A; Gribushin, A; Klyukhin, V; Kodolova, O; Lokhtin, I; Petrushanko, S; Sarycheva, L; Savrin, V; Snigirev, A; Vardanyan, I; Dremin, I; Kirakosyan, M; Konovalova, N; Rusakov, S V; Vinogradov, A; Akimenko, S; Artamonov, A; Azhgirey, I; Bitioukov, S; Burtovoy, V; Grishin, V; Kachanov, V; Konstantinov, D; Krychkine, V; Levine, A; Lobov, I; Lukanin, V; Mel'nik, Y; Petrov, V; Ryutin, R; Slabospitsky, S; Sobol, A; Sytine, A; Tourtchanovitch, L; Troshin, S; Tyurin, N; Uzunian, A; Volkov, A; Adzic, P; Djordjevic, M; Jovanovic, D; Krpic, D; Maletic, D; Puzovic, J; Smiljkovic, N; Aguilar-Benitez, M; Alberdi, J; Alcaraz Maestre, J; Arce, P; Barcala, J M; Battilana, C; Burgos Lazaro, C; Caballero Bejar, J; Calvo, E; Cardenas Montes, M; Cepeda, M; Cerrada, M; Chamizo Llatas, M; Clemente, F; Colino, N; Daniel, M; De La Cruz, B; Delgado Peris, A; Diez Pardos, C; Fernandez Bedoya, C; Fernández Ramos, J P; Ferrando, A; Flix, J; Fouz, M C; Garcia-Abia, P; Garcia-Bonilla, A C; Gonzalez Lopez, O; Goy Lopez, S; Hernandez, J M; Josa, M I; Marin, J; Merino, G; Molina, J; Molinero, A; Navarrete, J J; Oller, J C; Puerta Pelayo, J; Romero, L; Santaolalla, J; Villanueva Munoz, C; Willmott, C; Yuste, C; Albajar, C; Blanco Otano, M; de Trocóniz, J F; Garcia Raboso, A; Lopez Berengueres, J O; Cuevas, J; Fernandez Menendez, J; Gonzalez Caballero, I; Lloret Iglesias, L; Naves Sordo, H; Vizan Garcia, J M; Cabrillo, I J; Calderon, A; Chuang, S H; Diaz Merino, I; Diez Gonzalez, C; Duarte Campderros, J; Fernandez, M; Gomez, G; Gonzalez Sanchez, J; Gonzalez Suarez, R; Jorda, C; Lobelle Pardo, P; Lopez Virto, A; Marco, J; Marco, R; Martinez Rivero, C; Martinez Ruiz del Arbol, P; Matorras, F; Rodrigo, T; Ruiz Jimeno, A; Scodellaro, L; Sobron Sanudo, M; Vila, I; Vilar Cortabitarte, R; Abbaneo, D; Albert, E; Alidra, M; Ashby, S; Auffray, E; Baechler, J; Baillon, P; Ball, A H; Bally, S L; Barney, D; Beaudette, F; Bellan, R; Benedetti, D; Benelli, G; Bernet, C; Bloch, P; Bolognesi, S; Bona, M; Bos, J; Bourgeois, N; Bourrel, T; Breuker, H; Bunkowski, K; Campi, D; Camporesi, T; Cano, E; Cattai, A; Chatelain, J P; Chauvey, M; Christiansen, T; Coarasa Perez, J A; Conde Garcia, A; Covarelli, R; Curé, B; De Roeck, A; Delachenal, V; Deyrail, D; Di Vincenzo, S; Dos Santos, S; Dupont, T; Edera, L M; Elliott-Peisert, A; Eppard, M; Favre, M; Frank, N; Funk, W; Gaddi, A; Gastal, M; Gateau, M; Gerwig, H; Gigi, D; Gill, K; Giordano, D; Girod, J P; Glege, F; Gomez-Reino Garrido, R; Goudard, R; Gowdy, S; Guida, R; Guiducci, L; Gutleber, J; Hansen, M; Hartl, C; Harvey, J; Hegner, B; Hoffmann, H F; Holzner, A; Honma, A; Huhtinen, M; Innocente, V; Janot, P; Le Godec, G; Lecoq, P; Leonidopoulos, C; Loos, R; Lourenço, C; Lyonnet, A; Macpherson, A; Magini, N; Maillefaud, J D; Maire, G; Mäki, T; Malgeri, L; Mannelli, M; Masetti, L; Meijers, F; Meridiani, P; Mersi, S; Meschi, E; Meynet Cordonnier, A; Moser, R; Mulders, M; Mulon, J; Noy, M; Oh, A; Olesen, G; Onnela, A; Orimoto, T; Orsini, L; Perez, E; Perinic, G; Pernot, J F; Petagna, P; Petiot, P; Petrilli, A; Pfeiffer, A; Pierini, M; Pimiä, M; Pintus, R; Pirollet, B; Postema, H; Racz, A; Ravat, S; Rew, S B; Rodrigues Antunes, J; Rolandi, G; Rovere, M; Ryjov, V; Sakulin, H; Samyn, D; Sauce, H; Schäfer, C; Schlatter, W D; Schröder, M; Schwick, C; Sciaba, A; Segoni, I; Sharma, A; Siegrist, N; Siegrist, P; Sinanis, N; Sobrier, T; Sphicas, P; Spiga, D; Spiropulu, M; Stöckli, F; Traczyk, P; Tropea, P; Troska, J; Tsirou, A; Veillet, L; Veres, G I; Voutilainen, M; Wertelaers, P; Zanetti, M; Bertl, W; Deiters, K; Erdmann, W; Gabathuler, K; Horisberger, R; Ingram, Q; Kaestli, H C; König, S; Kotlinski, D; Langenegger, U; Meier, F; Renker, D; Rohe, T; Sibille, J; Starodumov, A; Betev, B; Caminada, L; Chen, Z; Cittolin, S; Da Silva Di Calafiori, D R; Dambach, S; Dissertori, G; Dittmar, M; Eggel, C; Eugster, J; Faber, G; Freudenreich, K; Grab, C; Hervé, A; Hintz, W; Lecomte, P; Luckey, P D; Lustermann, W; Marchica, C; Milenovic, P; Moortgat, F; Nardulli, A; Nessi-Tedaldi, F; Pape, L; Pauss, F; Punz, T; Rizzi, A; Ronga, F J; Sala, L; Sanchez, A K; Sawley, M C; Sordini, V; Stieger, B; Tauscher, L; Thea, A; Theofilatos, K; Treille, D; Trüb, P; Weber, M; Wehrli, L; Weng, J; Zelepoukine, S; Amsler, C; Chiochia, V; De Visscher, S; Regenfus, C; Robmann, P; Rommerskirchen, T; Schmidt, A; Tsirigkas, D; Wilke, L; Chang, Y H; Chen, E A; Chen, W T; Go, A; Kuo, C M; Li, S W; Lin, W; Bartalini, P; Chang, P; Chao, Y; Chen, K F; Hou, W S; Hsiung, Y; Lei, Y J; Lin, S W; Lu, R S; Schümann, J; Shiu, J G; Tzeng, Y M; Ueno, K; Velikzhanin, Y; Wang, C C; Wang, M; Adiguzel, A; Ayhan, A; Azman Gokce, A; Bakirci, M N; Cerci, S; Dumanoglu, I; Eskut, E; Girgis, S; Gurpinar, E; Hos, I; Karaman, T; Karaman, T; Kayis Topaksu, A; Kurt, P; Önengüt, G; Önengüt Gökbulut, G; Ozdemir, K; Ozturk, S; Polatöz, A; Sogut, K; Tali, B; Topakli, H; Uzun, D; Vergili, L N; Vergili, M; Akin, I V; Aliev, T; Bilmis, S; Deniz, M; Gamsizkan, H; Guler, A M; Öcalan, K; Serin, M; Sever, R; Surat, U E; Zeyrek, M; Deliomeroglu, M; Demir, D; Gülmez, E; Halu, A; Isildak, B; Kaya, M; Kaya, O; Ozkorucuklu, S; Sonmez, N; Levchuk, L; Lukyanenko, S; Soroka, D; Zub, S; Bostock, F; Brooke, J J; Cheng, T L; Cussans, D; Frazier, R; Goldstein, J; Grant, N; Hansen, M; Heath, G P; Heath, H F; Hill, C; Huckvale, B; Jackson, J; Mackay, C K; Metson, S; Newbold, D M; Nirunpong, K; Smith, V J; Velthuis, J; Walton, R; Bell, K W; Brew, C; Brown, R M; Camanzi, B; Cockerill, D J A; Coughlan, J A; Geddes, N I; Harder, K; Harper, S; Kennedy, B W; Murray, P; Shepherd-Themistocleous, C H; Tomalin, I R; Williams, J H; Womersley, W J; Worm, S D; Bainbridge, R; Ball, G; Ballin, J; Beuselinck, R; Buchmuller, O; Colling, D; Cripps, N; Davies, G; Della Negra, M; Foudas, C; Fulcher, J; Futyan, D; Hall, G; Hays, J; Iles, G; Karapostoli, G; MacEvoy, B C; Magnan, A M; Marrouche, J; Nash, J; Nikitenko, A; Papageorgiou, A; Pesaresi, M; Petridis, K; Pioppi, M; Raymond, D M; Rompotis, N; Rose, A; Ryan, M J; Seez, C; Sharp, P; Sidiropoulos, G; Stettler, M; Stoye, M; Takahashi, M; Tapper, A; Timlin, C; Tourneur, S; Vazquez Acosta, M; Virdee, T; Wakefield, S; Wardrope, D; Whyntie, T; Wingham, M; Cole, J E; Goitom, I; Hobson, P R; Khan, A; Kyberd, P; Leslie, D; Munro, C; Reid, I D; Siamitros, C; Taylor, R; Teodorescu, L; Yaselli, I; Bose, T; Carleton, M; Hazen, E; Heering, A H; Heister, A; John, J St; Lawson, P; Lazic, D; Osborne, D; Rohlf, J; Sulak, L; Wu, S; Andrea, J; Avetisyan, A; Bhattacharya, S; Chou, J P; Cutts, D; Esen, S; Kukartsev, G; Landsberg, G; Narain, M; Nguyen, D; Speer, T; Tsang, K V; Breedon, R; Calderon De La Barca Sanchez, M; Case, M; Cebra, D; Chertok, M; Conway, J; Cox, P T; Dolen, J; Erbacher, R; Friis, E; Ko, W; Kopecky, A; Lander, R; Lister, A; Liu, H; Maruyama, S; Miceli, T; Nikolic, M; Pellett, D; Robles, J; Searle, M; Smith, J; Squires, M; Stilley, J; Tripathi, M; Vasquez Sierra, R; Veelken, C; Andreev, V; Arisaka, K; Cline, D; Cousins, R; Erhan, S; Hauser, J; Ignatenko, M; Jarvis, C; Mumford, J; Plager, C; Rakness, G; Schlein, P; Tucker, J; Valuev, V; Wallny, R; Yang, X; Babb, J; Bose, M; Chandra, A; Clare, R; Ellison, J A; Gary, J W; Hanson, G; Jeng, G Y; Kao, S C; Liu, F; Liu, H; Luthra, A; Nguyen, H; Pasztor, G; Satpathy, A; Shen, B C; Stringer, R; Sturdy, J; Sytnik, V; Wilken, R; Wimpenny, S; Branson, J G; Dusinberre, E; Evans, D; Golf, F; Kelley, R; Lebourgeois, M; Letts, J; Lipeles, E; Mangano, B; Muelmenstaedt, J; Norman, M; Padhi, S; Petrucci, A; Pi, H; Pieri, M; Ranieri, R; Sani, M; Sharma, V; Simon, S; Würthwein, F; Yagil, A; Campagnari, C; D'Alfonso, M; Danielson, T; Garberson, J; Incandela, J; Justus, C; Kalavase, P; Koay, S A; Kovalskyi, D; Krutelyov, V; Lamb, J; Lowette, S; Pavlunin, V; Rebassoo, F; Ribnik, J; Richman, J; Rossin, R; Stuart, D; To, W; Vlimant, J R; Witherell, M; Apresyan, A; Bornheim, A; Bunn, J; Chiorboli, M; Gataullin, M; Kcira, D; Litvine, V; Ma, Y; Newman, H B; Rogan, C; Timciuc, V; Veverka, J; Wilkinson, R; Yang, Y; Zhang, L; Zhu, K; Zhu, R Y; Akgun, B; Carroll, R; Ferguson, T; Jang, D W; Jun, S Y; Paulini, M; Russ, J; Terentyev, N; Vogel, H; Vorobiev, I; Cumalat, J P; Dinardo, M E; Drell, B R; Ford, W T; Heyburn, B; Luiggi Lopez, E; Nauenberg, U; Stenson, K; Ulmer, K; Wagner, S R; Zang, S L; Agostino, L; Alexander, J; Blekman, F; Cassel, D; Chatterjee, A; Das, S; Gibbons, L K; Heltsley, B; Hopkins, W; Khukhunaishvili, A; Kreis, B; Kuznetsov, V; Patterson, J R; Puigh, D; Ryd, A; Shi, X; Stroiney, S; Sun, W; Teo, W D; Thom, J; Vaughan, J; Weng, Y; Wittich, P; Beetz, C P; Cirino, G; Sanzeni, C; Winn, D; Abdullin, S; Afaq, M A; Albrow, M; Ananthan, B; Apollinari, G; Atac, M; Badgett, W; Bagby, L; Bakken, J A; Baldin, B; Banerjee, S; Banicz, K; Bauerdick, L A T; Beretvas, A; Berryhill, J; Bhat, P C; Biery, K; Binkley, M; Bloch, I; Borcherding, F; Brett, A M; Burkett, K; Butler, J N; Chetluru, V; Cheung, H W K; Chlebana, F; Churin, I; Cihangir, S; Crawford, M; Dagenhart, W; Demarteau, M; Derylo, G; Dykstra, D; Eartly, D P; Elias, J E; Elvira, V D; Evans, D; Feng, L; Fischler, M; Fisk, I; Foulkes, S; Freeman, J; Gartung, P; Gottschalk, E; Grassi, T; Green, D; Guo, Y; Gutsche, O; Hahn, A; Hanlon, J; Harris, R M; Holzman, B; Howell, J; Hufnagel, D; James, E; Jensen, H; Johnson, M; Jones, C D; Joshi, U; Juska, E; Kaiser, J; Klima, B; Kossiakov, S; Kousouris, K; Kwan, S; Lei, C M; Limon, P; Lopez Perez, J A; Los, S; Lueking, L; Lukhanin, G; Lusin, S; Lykken, J; Maeshima, K; Marraffino, J M; Mason, D; McBride, P; Miao, T; Mishra, K; Moccia, S; Mommsen, R; Mrenna, S; Muhammad, A S; Newman-Holmes, C; Noeding, C; O'Dell, V; Prokofyev, O; Rivera, R; Rivetta, C H; Ronzhin, A; Rossman, P; Ryu, S; Sekhri, V; Sexton-Kennedy, E; Sfiligoi, I; Sharma, S; Shaw, T M; Shpakov, D; Skup, E; Smith, R P; Soha, A; Spalding, W J; Spiegel, L; Suzuki, I; Tan, P; Tanenbaum, W; Tkaczyk, S; Trentadue, R; Uplegger, L; Vaandering, E W; Vidal, R; Whitmore, J; Wicklund, E; Wu, W; Yarba, J; Yumiceva, F; Yun, J C; Acosta, D; Avery, P; Barashko, V; Bourilkov, D; Chen, M; Di Giovanni, G P; Dobur, D; Drozdetskiy, A; Field, R D; Fu, Y; Furic, I K; Gartner, J; Holmes, D; Kim, B; Klimenko, S; Konigsberg, J; Korytov, A; Kotov, K; Kropivnitskaya, A; Kypreos, T; Madorsky, A; Matchev, K; Mitselmakher, G; Pakhotin, Y; Piedra Gomez, J; Prescott, C; Rapsevicius, V; Remington, R; Schmitt, M; Scurlock, B; Wang, D; Yelton, J; Ceron, C; Gaultney, V; Kramer, L; Lebolo, L M; Linn, S; Markowitz, P; Martinez, G; Rodriguez, J L; Adams, T; Askew, A; Baer, H; Bertoldi, M; Chen, J; Dharmaratna, W G D; Gleyzer, S V; Haas, J; Hagopian, S; Hagopian, V; Jenkins, M; Johnson, K F; Prettner, E; Prosper, H; Sekmen, S; Baarmand, M M; Guragain, S; Hohlmann, M; Kalakhety, H; Mermerkaya, H; Ralich, R; Vodopiyanov, I; Abelev, B; Adams, M R; Anghel, I M; Apanasevich, L; Bazterra, V E; Betts, R R; Callner, J; Castro, M A; Cavanaugh, R; Dragoiu, C; Garcia-Solis, E J; Gerber, C E; Hofman, D J; Khalatian, S; Mironov, C; Shabalina, E; Smoron, A; Varelas, N; Akgun, U; Albayrak, E A; Ayan, A S; Bilki, B; Briggs, R; Cankocak, K; Chung, K; Clarida, W; Debbins, P; Duru, F; Ingram, F D; Lae, C K; McCliment, E; Merlo, J P; Mestvirishvili, A; Miller, M J; Moeller, A; Nachtman, J; Newsom, C R; Norbeck, E; Olson, J; Onel, Y; Ozok, F; Parsons, J; Schmidt, I; Sen, S; Wetzel, J; Yetkin, T; Yi, K; Barnett, B A; Blumenfeld, B; Bonato, A; Chien, C Y; Fehling, D; Giurgiu, G; Gritsan, A V; Guo, Z J; Maksimovic, P; Rappoccio, S; Swartz, M; Tran, N V; Zhang, Y; Baringer, P; Bean, A; Grachov, O; Murray, M; Radicci, V; Sanders, S; Wood, J S; Zhukova, V; Bandurin, D; Bolton, T; Kaadze, K; Liu, A; Maravin, Y; Onoprienko, D; Svintradze, I; Wan, Z; Gronberg, J; Hollar, J; Lange, D; Wright, D; Baden, D; Bard, R; Boutemeur, M; Eno, S C; Ferencek, D; Hadley, N J; Kellogg, R G; Kirn, M; Kunori, S; Rossato, K; Rumerio, P; Santanastasio, F; Skuja, A; Temple, J; Tonjes, M B; Tonwar, S C; Toole, T; Twedt, E; Alver, B; Bauer, G; 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

    During autumn 2008, the Silicon Strip Tracker was operated with the full CMS experiment in a comprehensive test, in the presence of the 3.8 T magnetic field produced by the CMS superconducting solenoid. Cosmic ray muons were detected in the muon chambers and used to trigger the readout of all CMS sub-detectors. About 15 million events with a muon in the tracker were collected. The efficiency of hit and track reconstruction were measured to be higher than 99% and consistent with expectations from Monte Carlo simulation. This article details the commissioning and performance of the Silicon Strip Tracker with cosmic ray muons.

  4. Silicon sensors for the upgrades of the CMS pixel detector

    Energy Technology Data Exchange (ETDEWEB)

    Centis Vignali, Matteo

    2015-12-15

    The Compact Muon Solenoid (CMS) is a general purpose detector at the Large Hadron Collider (LHC). The LHC luminosity is constantly increased through upgrades of the accelerator and its injection chain. Two major upgrades will take place in the next years. The first upgrade involves the LHC injector chain and allows the collider to achieve a luminosity of about 2.10{sup 34} cm{sup -2}s{sup -1}. A further upgrade of the LHC foreseen for 2025 will boost its luminosity to 5.10{sup 34} cm{sup -2}s{sup -1}. As a consequence of the increased luminosity, the detectors need to be upgraded. In particular, the CMS pixel detector will undergo two upgrades in the next years. The first upgrade (phase I) consists in the substitution of the current pixel detector in winter 2016/2017. The upgraded pixel detector will implement new readout electronics that allow efficient data taking up to a luminosity of 2.10{sup 34} cm{sup -2}s{sup -1}, twice as much as the LHC design luminosity. The modules that will constitute the upgraded detector are being produced at different institutes. Hamburg (University and DESY) is responsible for the production of 350 pixel modules. The second upgrade (phase II) of the pixel detector is foreseen for 2025. The innermost pixel layer of the upgraded detector will accumulate a radiation damage corresponding to an equivalent fluence of Φ{sub eq}=2.10{sup 16} cm{sup -2} and a dose of ∼10 MGy after an integrated luminosity of 3000 fb{sup -1}. Several groups are investigating sensor designs and configurations able to withstand such high doses and fluences. This work is divided into two parts related to important aspects of the upgrades of the CMS pixel detector. For the phase I upgrade, a setup has been developed to provide an absolute energy calibration of the pixel modules that will constitute the detector. The calibration is obtained using monochromatic X-rays. The same setup is used to test the buffering capabilities of the modules' readout chip

  5. Silicon sensors for the upgrades of the CMS pixel detector

    International Nuclear Information System (INIS)

    The Compact Muon Solenoid (CMS) is a general purpose detector at the Large Hadron Collider (LHC). The LHC luminosity is constantly increased through upgrades of the accelerator and its injection chain. Two major upgrades will take place in the next years. The first upgrade involves the LHC injector chain and allows the collider to achieve a luminosity of about 2.1034 cm-2s-1. A further upgrade of the LHC foreseen for 2025 will boost its luminosity to 5.1034 cm-2s-1. As a consequence of the increased luminosity, the detectors need to be upgraded. In particular, the CMS pixel detector will undergo two upgrades in the next years. The first upgrade (phase I) consists in the substitution of the current pixel detector in winter 2016/2017. The upgraded pixel detector will implement new readout electronics that allow efficient data taking up to a luminosity of 2.1034 cm-2s-1, twice as much as the LHC design luminosity. The modules that will constitute the upgraded detector are being produced at different institutes. Hamburg (University and DESY) is responsible for the production of 350 pixel modules. The second upgrade (phase II) of the pixel detector is foreseen for 2025. The innermost pixel layer of the upgraded detector will accumulate a radiation damage corresponding to an equivalent fluence of Φeq=2.1016 cm-2 and a dose of ∼10 MGy after an integrated luminosity of 3000 fb-1. Several groups are investigating sensor designs and configurations able to withstand such high doses and fluences. This work is divided into two parts related to important aspects of the upgrades of the CMS pixel detector. For the phase I upgrade, a setup has been developed to provide an absolute energy calibration of the pixel modules that will constitute the detector. The calibration is obtained using monochromatic X-rays. The same setup is used to test the buffering capabilities of the modules' readout chip. The maximum rate experienced by the modules produced in Hamburg will be 120 MHz

  6. Reception Test of Petals for the End Cap TEC+ of the CMS Silicon Strip Tracker

    CERN Document Server

    Bremer, R; Klein, Katja; Schmitz, Stefan Antonius; Adler, Volker; Adolphi, Roman; Ageron, Michel; Agram, Jean-Laurent; Atz, Bernd; Barvich, Tobias; Baulieu, Guillaume; Beaumont, Willem; Beissel, Franz; Bergauer, Thomas; Berst, Jean-Daniel; Blüm, Peter; Bock, E; Bogelsbacher, F; de Boer, Wim; Bonnet, Jean-Luc; Bonnevaux, Alain; Boudoul, Gaelle; Bouhali, Othmane; Braunschweig, Wolfgang; Brom, Jean-Marie; Butz, Erik; Chabanat, Eric; Chabert, Eric Christian; Clerbaux, Barbara; Contardo, Didier; De Callatay, Bernard; Dehm, Philip; Delaere, Christophe; Della Negra, Rodolphe; Dewulf, Jean-Paul; D'Hondt, Jorgen; Didierjean, Francois; Dierlamm, Alexander; Dirkes, Guido; Dragicevic, Marko; Drouhin, Frédéric; Ernenwein, Jean-Pierre; Esser, Hans; Estre, Nicolas; Fahrer, Manuel; Fernández, J; Florins, Benoit; Flossdorf, Alexander; Flucke, Gero; Flügge, Günter; Fontaine, Jean-Charles; Freudenreich, Klaus; Frey, Martin; Friedl, Markus; Furgeri, Alexander; Giraud, Noël; Goerlach, Ulrich; Goorens, Robert; Graehling, Philippe; Grégoire, Ghislain; Gregoriev, E; Gross, Laurent; Hansel, S; Haroutunian, Roger; Hartmann, Frank; Heier, Stefan; Hermanns, Thomas; Heydhausen, Dirk; Heyninck, Jan; Hosselet, J; Hrubec, Josef; Jahn, Dieter; Juillot, Pierre; Kaminski, Jochen; Karpinski, Waclaw; Kaussen, Gordon; Keutgen, Thomas; Klanner, Robert; König, Stefan; Kosbow, M; Krammer, Manfred; Ledermann, Bernhard; Lemaître, Vincent; De Lentdecker, Gilles; Linn, Alexander; Lounis, Abdenour; Lübelsmeyer, Klaus; Lumb, Nicholas; Maazouzi, Chaker; Mahmoud, Tariq; Michotte, Daniel; Militaru, Otilia; Mirabito, Laurent; Müller, Thomas; Neukermans, Lionel; Ollivetto, C; Olzem, Jan; Ostapchuk, Andrey; Pandoulas, Demetrios; Pein, Uwe; Pernicka, Manfred; Perriès, Stephane; Piaseki, C; Pierschel, Gerhard; Piotrzkowski, Krzysztof; Poettgens, Michael; Pooth, Oliver; Rouby, Xavier; Sabellek, Andreas; Schael, Stefan; Schirm, Norbert; Schleper, Peter; Schultz von Dratzig, Arndt; Siedling, Rolf; Simonis, Hans-Jürgen; Stahl, Achim; Steck, Pia; Steinbruck, G; Stoye, Markus; Strub, Roger; Tavernier, Stefaan; Teyssier, Daniel; Theel, Andreas; Trocmé, Benjamin; Udo, Fred; Van der Donckt, M; Van der Velde, C; Van Hove, Pierre; Vanlaer, Pascal; Van Lancker, Luc; Van Staa, Rolf; Vanzetto, Sylvain; Weber, Markus; Weiler, Thomas; Weseler, Siegfried; Wickens, John; Wittmer, Bruno; Wlochal, Michael; De Wolf, Eddi A; Zhukov, Valery; Zoeller, Marc Henning

    2009-01-01

    The silicon strip tracker of the CMS experiment has been completed and was inserted into the CMS detector in late 2007. The largest sub system of the tracker are its end caps, comprising two large end caps (TEC) each containing 3200 silicon strip modules. To ease construction, the end caps feature a modular design: groups of about 20 silicon modules are placed on sub-assemblies called petals and these self-contained elements are then mounted onto the TEC support structures. Each end cap consists of 144 such petals, which were built and fully qualified by several institutes across Europe. From

  7. Local reconstruction software for the CMS silicon strip tracker

    International Nuclear Information System (INIS)

    CMS has a two level trigger system. The first stage is hardware based and provides fast trigger decisions up to a rate 100 kHz. The second stage, known as the High-Level Trigger, is entirely software based and required to provide a trigger decision within 40 ms and a rejection factor of a thousand to achieve a write-to-disk rate of 100 Hz. One of the most CPU-intensive tasks within the High-Level Trigger is the reconstruction of tracking hits using raw data from the strip tracker. This study profiles the performance of these reconstruction algorithms. Even at low luminosities, the average processing time is 5.5 s, which already exceeds the HLT budget. A new schema, optimised for speed and performance, has been developed to reconstruct hits within regions-of-interest only. For the entire sub-detector, hit reconstruction times are reduced to 140 ms. Since only 10 % of High-Level Trigger events are expected to require track reconstruction, the average contribution per event is then ∼14 ms i.e. 30 % of the full budget. Regional reconstruction is tested over Z0 → e+e- events, by unpacking in η-φ windows of 0.16 x 0.16 around seeds identified in the calorimeter. In this case, only 2 ± 1 % of the silicon strip tracker raw data is reconstructed in 5 ± 3 ms (or an average contribution per event of 0.5 ms) whilst maintaining 99 % of the original dielectron trigger efficiency

  8. Implementation of a Large Scale Control System for a High-Energy Physics Detector: The CMS Silicon Strip Tracker

    CERN Document Server

    Masetti, Lorenzo; Fischer, Peter

    2011-01-01

    Control systems for modern High-Energy Physics (HEP) detectors are large distributed software systems managing a significant data volume and implementing complex operational procedures. The control software for the LHC experiments at CERN is built on top of a commercial software used in industrial automation. However, HEP specific requirements call for extended functionalities. This thesis focuses on the design and implementation of the control system for the CMS Silicon Strip Tracker but presents some general strategies that have been applied in other contexts. Specific design solutions are developed to ensure acceptable response times and to provide the operator with an effective summary of the status of the devices. Detector safety is guaranteed by proper configuration of independent hardware systems. A software protection mechanism is used to avoid the widespread intervention of the hardware safety and to inhibit dangerous commands. A wizard approach allows non expert operators to recover error situations...

  9. Development and Evaluation of Test Stations for the Quality Assurance of the Silicon Micro-Strip Detector Modules for the CMS Experiment

    CERN Document Server

    Pöttgens, Michael

    2007-01-01

    CMS (Compact Muon Solenoid) is one of four large-scale detectors which will be operated at the LHC (Large Hadron Collider) at the European Laboratory for Particle Physics (CERN). For the search for new physics the reconstruction of the collision products and their properties is essential. In the innermost part of the CMS detector the traces of ionizing particles are measured utilizing a silicon tracker. A large fraction of this detector is equipped with silicon micro-strip modules which provide a precise space resolution in 1-dimension. A module consists of a sensor for detection of particles, the corresponding read-out electronics (hybrid) and a mechanical support structure. Since the 15,148 modules, which will be installed in the silicon micro-strip detector, have a total sensitive surface area of about 198 m2, the inner tracker of CMS is the largest silicon tracking detector, which has ever been built. While the sensors and hybrids are produced in industry, the construction of the modules and the control o...

  10. The CMS Trigger Supervisor: Control and Hardware Monitoring System of the CMS Level-1 Trigger at CERN

    CERN Document Server

    Ildefons Magrans de Abril

    2008-01-01

    The experiments CMS (Compact Muon Solenoid) and ATLAS (A Toroidal LHC ApparatuS) at the LargeHadron Collider (LHC) are the greatest exponents of the rising complexity in High Energy Physics (HEP) datahandling instrumentation. Tens of millions of readout channels, tens of thousands of hardware boards and thesame order of connections are figures of merit. However, the hardware volume is not the only complexitydimension, the unprecedented large number of research institutes and scientists that form the internationalcollaborations, and the long design, development, commissioning and operational phases are additional factorsthat must be taken into account.The Level-1 (L1) trigger decision loop is an excellent example of these difficulties. This system is based on apipelined logic destined to analyze without deadtime the data from each LHC bunch crossing occurring every25_ns, using special coarsely segmented trigger data from the detectors. The L1 trigger is responsible forreducing the rate of accepted crossings to...

  11. Integration of the end cap TEC+ of the CMS silicon strip tracker

    International Nuclear Information System (INIS)

    CMS is the first large experiment of high-energy particle physics whose inner tracking system is exclusively instrumented with silicon detector modules. This tracker comprises 15 148 silicon strip modules enclosing the interaction point in 10-12 layers. The 1. Physikalisches Institut B of RWTH Aachen was deeply involved in the completion of the end caps of the tracking system. The institute played a leading role in the end cap design, produced virtually all support structures and several important electrical components, designed and built the laser alignment system of the tracker, performed system tests and finally integrated one of the two end caps in Aachen. This integration constitutes the central part of the present thesis work. The main focus was on the development of methods to recognise defects early in the integration process and to assert the detector's functionality. Characteristic quantities such as the detector noise or the optical gain of the readout chain were determined during integration as well as during a series of tests performed after transport of the end cap from Aachen to CERN. The procedures followed during the mechanical integration of the detector and during the commissioning of integrated sectors are explained, and the software packages developed for quality assurance are described. In addition, results of the detector readout are presented. During the integration phase, sub-structures of the end cap - named petals - were subjected to a reception test which has also been designed and operated as part of this thesis work. The test setup and software developed for the test are introduced and an account of the analysis of the recorded data is given. Before the end cap project entered the production phase, a final test beam experiment was performed in which the suitability of a system of two fully equipped petals for operation at the LHC was checked. The measured ratio of the signal induced in the silicon sensors by minimal ionising particles

  12. Integration of the end cap TEC+ of the CMS silicon strip tracker

    Energy Technology Data Exchange (ETDEWEB)

    Bremer, Richard

    2008-04-28

    CMS is the first large experiment of high-energy particle physics whose inner tracking system is exclusively instrumented with silicon detector modules. This tracker comprises 15 148 silicon strip modules enclosing the interaction point in 10-12 layers. The 1. Physikalisches Institut B of RWTH Aachen was deeply involved in the completion of the end caps of the tracking system. The institute played a leading role in the end cap design, produced virtually all support structures and several important electrical components, designed and built the laser alignment system of the tracker, performed system tests and finally integrated one of the two end caps in Aachen. This integration constitutes the central part of the present thesis work. The main focus was on the development of methods to recognise defects early in the integration process and to assert the detector's functionality. Characteristic quantities such as the detector noise or the optical gain of the readout chain were determined during integration as well as during a series of tests performed after transport of the end cap from Aachen to CERN. The procedures followed during the mechanical integration of the detector and during the commissioning of integrated sectors are explained, and the software packages developed for quality assurance are described. In addition, results of the detector readout are presented. During the integration phase, sub-structures of the end cap - named petals - were subjected to a reception test which has also been designed and operated as part of this thesis work. The test setup and software developed for the test are introduced and an account of the analysis of the recorded data is given. Before the end cap project entered the production phase, a final test beam experiment was performed in which the suitability of a system of two fully equipped petals for operation at the LHC was checked. The measured ratio of the signal induced in the silicon sensors by minimal ionising

  13. The construction of the CMS electromagnetic calorimeter: delivery of the 3rd and 4th endcap "Dees" and Ring Flanges to CERN

    CERN Multimedia

    2006-01-01

    Delivery of the 3rd and 4th Dees and Ring Flanges of the CMS-ECAL endcaps to CERN. The pictures show also an endcap crystal with its VPT (Vacuum PhotoTriode), the aluminium blackplates of the endcap Dees and four mock supercrystals (5x5 crystals) attached in their position on the backplate, along with 138 positional spacers. Finally, endcap assembly in the CMS construction hall in Cessy (neighbouring France) is also shown.

  14. CERN awards "Gold CMS Award" to Savyolovsk machine-building Plant

    CERN Multimedia

    2007-01-01

    "The contribution pf Savyolovsk machine-building Plant OJSC into the international program to develop an CMS unit was recognized by the European Nuclear Research Center with "Gold Prize"for 2007. (1 small paragraph)

  15. CERN Summer Student report 2016: Search for dark matter with CMS

    CERN Document Server

    Hallin, Anna

    2016-01-01

    During this summer student project I have followed the analysis procedures for a search for Dark Matter with the CMS experiment. The project has included studying how the detector works, learning how to analyse physics objects using the CMS software framework, studying the theory and analysis strategy for this particular search, and doing some work with observables and event displays to contribute to the analysis.

  16. Test Results of the Semi-transparent Amorphous Silicon Sensors for the Link System of CMS

    CERN Document Server

    Fernández, Marcos; Figueroa, Carlos; García, N; Josa-Mutuberria, I; Molinero, Antonio; Oller, Juan Carlos; Rodrigo, Teresa; Vila, Ivan

    1998-01-01

    Semitransparent amorphous silicon sensors have been proposed as the 2D positioning sensors for the link system of the CMS alignment. We have developed a general method to characterise these sensors from the signal reconstruction to the beam deflection. The transparency for the HeNe wavelength has also been calculated.

  17. Alignment of the CMS Silicon Tracker during Commissioning with Cosmic Rays

    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; Dimitrov, L; Genchev, V; Iaydjiev, P; Piperov, S; Stoykova, S; Sultanov, G; Trayanov, R; Vankov, I; Dimitrov, A; Dyulendarova, M; Kozhuharov, V; Litov, L; Marinova, E; Mateev, M; Pavlov, B; Petkov, P; Toteva, Z; Chen, G M; Chen, H S; Guan, W; Jiang, C H; Liang, D; Liu, B; Meng, X; Tao, J; Wang, J; Wang, Z; Xue, Z; Zhang, Z; Ban, Y; Cai, J; Ge, Y; Guo, S; Hu, Z; Mao, Y; Qian, S J; Teng, H; Zhu, B; Avila, C; Baquero Ruiz, M; Carrillo Montoya, C A; Gomez, A; Gomez Moreno, B; Ocampo Rios, A A; Osorio Oliveros, A F; Reyes Romero, D; Sanabria, J C; Godinovic, N; Lelas, K; Plestina, R; Polic, D; Puljak, I; Antunovic, Z; Dzelalija, M; Brigljevic, V; Duric, S; Kadija, K; Morovic, S; Fereos, R; Galanti, M; Mousa, J; Papadakis, A; Ptochos, F; Razis, P A; Tsiakkouri, D; Zinonos, Z; Hektor, A; Kadastik, M; Kannike, K; Müntel, M; Raidal, M; Rebane, L; Anttila, E; Czellar, S; Härkönen, J; Heikkinen, A; Karimäki, V; Kinnunen, R; Klem, J; Kortelainen, M J; Lampén, T; Lassila-Perini, K; Lehti, S; Lindén, T; Luukka, P; Mäenpää, T; Nysten, J; Tuominen, E; Tuominiemi, J; Ungaro, D; Wendland, L; Banzuzi, K; Korpela, A; Tuuva, T; Nedelec, P; Sillou, D; Besancon, M; Chipaux, R; Dejardin, M; Denegri, D; Descamps, J; Fabbro, B; Faure, J L; Ferri, F; Ganjour, S; Gentit, F X; Givernaud, A; Gras, P; Hamel de Monchenault, G; Jarry, P; Lemaire, M C; Locci, E; Malcles, J; Marionneau, M; Millischer, L; Rander, J; Rosowsky, A; Rousseau, D; Titov, M; Verrecchia, P; Baffioni, S; Bianchini, L; Bluj, M; Busson, P; Charlot, C; Dobrzynski, L; Granier de Cassagnac, R; Haguenauer, M; Miné, P; Paganini, P; Sirois, Y; Thiebaux, C; Zabi, A; Agram, J L; Besson, A; Bloch, D; Bodin, D; Brom, J M; Conte, E; Drouhin, F; Fontaine, J C; Gelé, D; Goerlach, U; Gross, L; Juillot, P; Le Bihan, A C; Patois, Y; Speck, J; Van Hove, P; Baty, C; Bedjidian, M; Blaha, J; Boudoul, G; Brun, H; Chanon, N; Chierici, R; Contardo, D; Depasse, P; Dupasquier, T; El Mamouni, H; Fassi, F; Fay, J; Gascon, S; Ille, B; Kurca, T; Le Grand, T; Lethuillier, M; Lumb, N; Mirabito, L; Perries, S; Vander Donckt, M; Verdier, P; Djaoshvili, N; Roinishvili, N; Roinishvili, V; Amaglobeli, N; Adolphi, R; Anagnostou, G; Brauer, R; Braunschweig, W; Edelhoff, M; Esser, H; Feld, L; Karpinski, W; Khomich, A; Klein, K; Mohr, N; Ostaptchouk, A; Pandoulas, D; Pierschel, G; Raupach, F; Schael, S; Schultz von Dratzig, A; Schwering, G; Sprenger, D; Thomas, M; Weber, M; Wittmer, B; Wlochal, M; Actis, O; Altenhöfer, G; Bender, W; Biallass, P; Erdmann, M; Fetchenhauer, G; Frangenheim, J; Hebbeker, T; Hilgers, G; Hinzmann, A; Hoepfner, K; Hof, C; Kirsch, M; Klimkovich, T; Kreuzer, P; Lanske, D; Merschmeyer, M; Meyer, A; Philipps, B; Pieta, H; Reithler, H; Schmitz, S A; Sonnenschein, L; Sowa, M; Steggemann, J; Szczesny, H; Teyssier, D; Zeidler, C; Bontenackels, M; Davids, M; Duda, M; Flügge, G; Geenen, H; Giffels, M; Haj Ahmad, W; Hermanns, T; Heydhausen, D; Kalinin, S; Kress, T; Linn, A; Nowack, A; Perchalla, L; Poettgens, M; Pooth, O; Sauerland, P; Stahl, A; Tornier, D; Zoeller, M H; Aldaya Martin, M; Behrens, U; Borras, K; Campbell, A; Castro, E; Dammann, D; Eckerlin, G; Flossdorf, A; Flucke, G; Geiser, A; Hatton, D; Hauk, J; Jung, H; Kasemann, M; Katkov, I; Kleinwort, C; Kluge, H; Knutsson, A; Kuznetsova, E; Lange, W; Lohmann, W; Mankel, R; Marienfeld, M; Meyer, A B; Miglioranzi, S; Mnich, J; Ohlerich, M; Olzem, J; Parenti, A; Rosemann, C; Schmidt, R; Schoerner-Sadenius, T; Volyanskyy, D; Wissing, C; Zeuner, W D; Autermann, C; Bechtel, F; Draeger, J; Eckstein, D; Gebbert, U; Kaschube, K; Kaussen, G; Klanner, R; Mura, B; Naumann-Emme, S; Nowak, F; Pein, U; Sander, C; Schleper, P; Schum, T; Stadie, H; Steinbrück, G; Thomsen, J; Wolf, R; Bauer, J; Blüm, P; Buege, V; Cakir, A; Chwalek, T; De Boer, W; Dierlamm, A; Dirkes, G; Feindt, M; Felzmann, U; Frey, M; Furgeri, A; Gruschke, J; Hackstein, C; Hartmann, F; Heier, S; Heinrich, M; Held, H; Hirschbuehl, D; Hoffmann, K H; Honc, S; Jung, C; Kuhr, T; Liamsuwan, T; Martschei, D; Mueller, S; Müller, Th; Neuland, M B; 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; Kaur, R; Kohli, J M; Mehta, M Z; Nishu, N; Saini, L K; Sharma, A; Singh, A; Singh, J B; Singh, S P; Ahuja, S; Arora, S; Bhattacharya, S; Chauhan, S; Choudhary, B C; Gupta, P; Jain, S; Jain, S; Jha, M; Kumar, A; Ranjan, K; Shivpuri, R K; Srivastava, A K; Choudhury, R K; Dutta, D; Kailas, S; Kataria, S K; Mohanty, A K; Pant, L M; Shukla, P; Topkar, A; Aziz, T; Guchait, M; Gurtu, A; Maity, M; Majumder, D; Majumder, G; Mazumdar, K; Nayak, A; Saha, A; Sudhakar, K; Banerjee, S; Dugad, S; Mondal, N K; Arfaei, H; Bakhshiansohi, H; Fahim, A; Jafari, A; Mohammadi Najafabadi, M; Moshaii, A; Paktinat Mehdiabadi, S; Rouhani, S; Safarzadeh, B; Zeinali, M; Felcini, M; Abbrescia, M; Barbone, L; Chiumarulo, F; Clemente, A; Colaleo, A; Creanza, D; Cuscela, G; De Filippis, N; De Palma, M; De Robertis, G; Donvito, G; Fedele, F; Fiore, L; Franco, M; Iaselli, G; Lacalamita, N; Loddo, F; Lusito, L; Maggi, G; Maggi, M; Manna, N; Marangelli, B; My, S; Natali, S; Nuzzo, S; Papagni, G; Piccolomo, S; Pierro, G A; Pinto, C; Pompili, A; Pugliese, G; Rajan, R; Ranieri, A; Romano, F; Roselli, G; Selvaggi, G; Shinde, Y; Silvestris, L; Tupputi, S; Zito, G; Abbiendi, G; Bacchi, W; Benvenuti, A C; Boldini, M; Bonacorsi, D; Braibant-Giacomelli, S; Cafaro, V D; Caiazza, S S; Capiluppi, P; Castro, A; Cavallo, F R; Codispoti, G; Cuffiani, M; D'Antone, I; Dallavalle, G M; Fabbri, F; Fanfani, A; Fasanella, D; Giacomelli, P; Giordano, V; Giunta, M; Grandi, C; Guerzoni, M; Marcellini, S; Masetti, G; Montanari, A; Navarria, F L; Odorici, F; Pellegrini, G; Perrotta, A; Rossi, A M; Rovelli, T; Siroli, G; Torromeo, G; Travaglini, R; Albergo, S; Costa, S; Potenza, R; Tricomi, A; Tuve, C; Barbagli, G; Broccolo, G; Ciulli, V; Civinini, C; D'Alessandro, R; Focardi, E; Frosali, S; Gallo, E; Genta, C; Landi, G; Lenzi, P; Meschini, M; Paoletti, S; Sguazzoni, G; Tropiano, A; Benussi, L; Bertani, M; Bianco, S; Colafranceschi, S; Colonna, D; Fabbri, F; Giardoni, M; Passamonti, L; Piccolo, D; Pierluigi, D; Ponzio, B; Russo, A; Fabbricatore, P; Musenich, R; Benaglia, A; Calloni, M; Cerati, G B; D'Angelo, P; De Guio, F; Farina, F M; Ghezzi, A; Govoni, P; Malberti, M; Malvezzi, S; Martelli, A; Menasce, D; Miccio, V; Moroni, L; Negri, P; Paganoni, M; Pedrini, D; Pullia, A; Ragazzi, S; Redaelli, N; Sala, S; Salerno, R; Tabarelli de Fatis, T; Tancini, V; Taroni, S; Buontempo, S; Cavallo, N; Cimmino, A; De Gruttola, M; Fabozzi, F; Iorio, A O M; Lista, L; Lomidze, D; Noli, P; Paolucci, P; Sciacca, C; Azzi, P; Bacchetta, N; Barcellan, L; Bellan, P; Bellato, M; Benettoni, M; Biasotto, M; Bisello, D; Borsato, E; Branca, A; Carlin, R; Castellani, L; Checchia, P; Conti, E; Dal Corso, F; De Mattia, M; Dorigo, T; Dosselli, U; Fanzago, F; Gasparini, F; Gasparini, U; Giubilato, P; Gonella, F; Gresele, A; Gulmini, M; Kaminskiy, A; Lacaprara, S; Lazzizzera, I; Margoni, M; Maron, G; Mattiazzo, S; Mazzucato, M; Meneghelli, M; Meneguzzo, A T; Michelotto, M; Montecassiano, F; Nespolo, M; Passaseo, M; Pegoraro, M; Perrozzi, L; Pozzobon, N; Ronchese, P; Simonetto, F; Toniolo, N; Torassa, E; Tosi, M; Triossi, A; Vanini, S; Ventura, S; Zotto, P; Zumerle, G; Baesso, P; Berzano, U; Bricola, S; Necchi, M M; Pagano, D; Ratti, S P; Riccardi, C; Torre, P; Vicini, A; Vitulo, P; Viviani, C; Aisa, D; Aisa, S; Babucci, E; Biasini, M; Bilei, G M; Caponeri, B; Checcucci, B; Dinu, N; Fanò, L; Farnesini, L; Lariccia, P; Lucaroni, A; Mantovani, G; Nappi, A; Piluso, A; Postolache, V; Santocchia, A; Servoli, L; Tonoiu, D; Vedaee, A; Volpe, R; Azzurri, P; Bagliesi, G; Bernardini, J; Berretta, L; Boccali, T; Bocci, A; Borrello, L; Bosi, F; Calzolari, F; Castaldi, R; Dell'Orso, R; Fiori, F; Foà, L; Gennai, S; Giassi, A; Kraan, A; Ligabue, F; Lomtadze, T; Mariani, F; Martini, L; Massa, M; Messineo, A; Moggi, A; Palla, F; Palmonari, F; Petragnani, G; Petrucciani, G; Raffaelli, F; Sarkar, S; Segneri, G; Serban, A T; Spagnolo, P; Tenchini, R; Tolaini, S; Tonelli, G; Venturi, A; Verdini, P G; Baccaro, S; Barone, L; Bartoloni, A; Cavallari, F; Dafinei, I; Del Re, D; Di Marco, E; Diemoz, M; Franci, D; Longo, E; Organtini, G; Palma, A; Pandolfi, F; Paramatti, R; Pellegrino, F; Rahatlou, S; Rovelli, C; Alampi, G; Amapane, N; Arcidiacono, R; Argiro, S; Arneodo, M; Biino, C; Borgia, M A; Botta, C; Cartiglia, N; Castello, R; Cerminara, G; Costa, M; Dattola, D; Dellacasa, G; Demaria, N; Dughera, G; Dumitrache, F; Graziano, A; Mariotti, C; Marone, M; Maselli, S; Migliore, E; Mila, G; Monaco, V; Musich, M; Nervo, M; Obertino, M M; Oggero, S; Panero, R; Pastrone, N; Pelliccioni, M; Romero, A; Ruspa, M; Sacchi, R; Solano, A; Staiano, A; Trapani, P P; Trocino, D; Vilela Pereira, A; Visca, L; Zampieri, A; Ambroglini, F; Belforte, S; Cossutti, F; Della Ricca, G; Gobbo, B; Penzo, A; Chang, S; Chung, J; Kim, D H; Kim, G N; Kong, D J; Park, H; Son, D C; Bahk, S Y; Song, S; Jung, S Y; Hong, B; Kim, H; Kim, J H; Lee, K S; Moon, D H; Park, S K; Rhee, H B; Sim, K S; Kim, J; Choi, M; Hahn, G; Park, I C; Choi, S; Choi, Y; Goh, J; Jeong, H; Kim, T J; Lee, J; Lee, S; Janulis, M; Martisiute, D; Petrov, P; Sabonis, T; Castilla Valdez, H; Sánchez Hernández, A; Carrillo Moreno, S; Morelos Pineda, A; Allfrey, P; Gray, R N C; Krofcheck, D; Bernardino Rodrigues, N; Butler, P H; Signal, T; Williams, J C; Ahmad, M; Ahmed, I; Ahmed, W; Asghar, M I; Awan, M I M; Hoorani, H R; Hussain, I; Khan, W A; Khurshid, T; Muhammad, S; Qazi, S; Shahzad, H; Cwiok, M; Dabrowski, R; Dominik, W; Doroba, K; Konecki, M; Krolikowski, J; Pozniak, K; Romaniuk, Ryszard; Zabolotny, W; Zych, P; Frueboes, T; Gokieli, R; Goscilo, L; Górski, M; Kazana, M; Nawrocki, K; Szleper, M; Wrochna, G; Zalewski, P; Almeida, N; Antunes Pedro, L; Bargassa, P; David, A; Faccioli, P; Ferreira Parracho, P G; Freitas Ferreira, M; Gallinaro, M; Guerra Jordao, M; Martins, P; Mini, G; Musella, P; Pela, J; Raposo, L; Ribeiro, P Q; Sampaio, S; Seixas, J; Silva, J; Silva, P; Soares, D; Sousa, M; Varela, J; Wöhri, H K; Altsybeev, I; Belotelov, I; Bunin, P; Ershov, Y; Filozova, I; Finger, M; Finger, M Jr; Golunov, A; Golutvin, I; Gorbounov, N; Kalagin, V; Kamenev, A; Karjavin, V; Konoplyanikov, V; Korenkov, V; Kozlov, G; Kurenkov, A; Lanev, A; Makankin, A; Mitsyn, V V; Moisenz, P; Nikonov, E; Oleynik, D; Palichik, V; Perelygin, V; Petrosyan, A; Semenov, R; Shmatov, S; Smirnov, V; Smolin, D; Tikhonenko, E; Vasil'ev, S; Vishnevskiy, A; Volodko, A; Zarubin, A; Zhiltsov, V; Bondar, N; Chtchipounov, L; Denisov, A; Gavrikov, Y; Gavrilov, G; Golovtsov, V; Ivanov, Y; Kim, V; Kozlov, V; Levchenko, P; Obrant, G; Orishchin, E; Petrunin, A; Shcheglov, Y; Shchetkovskiy, A; Sknar, V; Smirnov, I; Sulimov, V; Tarakanov, V; Uvarov, L; Vavilov, S; Velichko, G; Volkov, S; Vorobyev, A; Andreev, Yu; Anisimov, A; Antipov, P; Dermenev, A; Gninenko, S; Golubev, N; Kirsanov, M; Krasnikov, N; Matveev, V; Pashenkov, A; Postoev, V E; Solovey, A; Solovey, A; Toropin, A; Troitsky, S; Baud, A; Epshteyn, V; Gavrilov, V; Ilina, N; Kaftanov, V; Kolosov, V; Kossov, M; Krokhotin, A; Kuleshov, S; Oulianov, A; Safronov, G; Semenov, S; Shreyber, I; Stolin, V; Vlasov, E; Zhokin, A; Boos, E; Dubinin, M; Dudko, L; Ershov, A; Gribushin, A; Klyukhin, V; Kodolova, O; Lokhtin, I; Petrushanko, S; Sarycheva, L; Savrin, V; Snigirev, A; Vardanyan, I; Dremin, I; Kirakosyan, M; Konovalova, N; Rusakov, S V; Vinogradov, A; Akimenko, S; Artamonov, A; Azhgirey, I; Bitioukov, S; Burtovoy, V; Grishin, V; Kachanov, V; Konstantinov, D; Krychkine, V; Levine, A; Lobov, I; Lukanin, V; Mel'nik, Y; Petrov, V; Ryutin, R; Slabospitsky, S; Sobol, A; Sytine, A; Tourtchanovitch, L; Troshin, S; Tyurin, N; Uzunian, A; Volkov, A; Adzic, P; Djordjevic, M; Jovanovic, D; Krpic, D; Maletic, D; Puzovic, J; Smiljkovic, N; Aguilar-Benitez, M; Alberdi, J; Alcaraz Maestre, J; Arce, P; Barcala, J M; Battilana, C; Burgos Lazaro, C; Caballero Bejar, J; Calvo, E; Cardenas Montes, M; Cepeda, M; Cerrada, M; Chamizo Llatas, M; Clemente, F; Colino, N; Daniel, M; De La Cruz, B; Delgado Peris, A; Diez Pardos, C; Fernandez Bedoya, C; Fernández Ramos, J P; Ferrando, A; Flix, J; Fouz, M C; Garcia-Abia, P; Garcia-Bonilla, A C; Gonzalez Lopez, O; Goy Lopez, S; Hernandez, J M; Josa, M I; Marin, J; Merino, G; Molina, J; Molinero, A; Navarrete, J J; Oller, J C; Puerta Pelayo, J; Romero, L; Santaolalla, J; Villanueva Munoz, C; Willmott, C; Yuste, C; Albajar, C; Blanco Otano, M; de Trocóniz, J F; Garcia Raboso, A; Lopez Berengueres, J O; Cuevas, J; Fernandez Menendez, J; Gonzalez Caballero, I; Lloret Iglesias, L; Naves Sordo, H; Vizan Garcia, J M; Cabrillo, I J; Calderon, A; Chuang, S H; Diaz Merino, I; Diez Gonzalez, C; Duarte Campderros, J; Fernandez, M; Gomez, G; Gonzalez Sanchez, J; Gonzalez Suarez, R; Jorda, C; Lobelle Pardo, P; Lopez Virto, A; Marco, J; Marco, R; Martinez Rivero, C; Martinez Ruiz del Arbol, P; Matorras, F; Rodrigo, T; Ruiz Jimeno, A; Scodellaro, L; Sobron Sanudo, M; Vila, I; Vilar Cortabitarte, R; Abbaneo, D; Albert, E; Alidra, M; Ashby, S; Auffray, E; Baechler, J; Baillon, P; Ball, A H; Bally, S L; Barney, D; Beaudette, F; Bellan, R; Benedetti, D; Benelli, G; Bernet, C; Bloch, P; Bolognesi, S; Bona, M; Bos, J; Bourgeois, N; Bourrel, T; Breuker, H; Bunkowski, K; Campi, D; Camporesi, T; Cano, E; Cattai, A; Chatelain, J P; Chauvey, M; Christiansen, T; Coarasa Perez, J A; Conde Garcia, A; Covarelli, R; Curé, B; De Roeck, A; Delachenal, V; Deyrail, D; Di Vincenzo, S; Dos Santos, S; Dupont, T; Edera, L M; Elliott-Peisert, A; Eppard, M; Favre, M; Frank, N; Funk, W; Gaddi, A; Gastal, M; Gateau, M; Gerwig, H; Gigi, D; Gill, K; Giordano, D; Girod, J P; Glege, F; Gomez-Reino Garrido, R; Goudard, R; Gowdy, S; Guida, R; Guiducci, L; Gutleber, J; Hansen, M; Hartl, C; Harvey, J; Hegner, B; Hoffmann, H F; Holzner, A; Honma, A; Huhtinen, M; Innocente, V; Janot, P; Le Godec, G; Lecoq, P; Leonidopoulos, C; Loos, R; Lourenço, C; Lyonnet, A; Macpherson, A; Magini, N; Maillefaud, J D; Maire, G; Mäki, T; Malgeri, L; Mannelli, M; Masetti, L; Meijers, F; Meridiani, P; Mersi, S; Meschi, E; Meynet Cordonnier, A; Moser, R; Mulders, M; Mulon, J; Noy, M; Oh, A; Olesen, G; Onnela, A; Orimoto, T; Orsini, L; Perez, E; Perinic, G; Pernot, J F; Petagna, P; Petiot, P; Petrilli, A; Pfeiffer, A; Pierini, M; Pimiä, M; Pintus, R; Pirollet, B; Postema, H; Racz, A; Ravat, S; Rew, S B; Rodrigues Antunes, J; Rolandi, G; Rovere, M; Ryjov, V; Sakulin, H; Samyn, D; Sauce, H; Schäfer, C; Schlatter, W D; Schröder, M; Schwick, C; Sciaba, A; Segoni, I; Sharma, A; Siegrist, N; Siegrist, P; Sinanis, N; Sobrier, T; Sphicas, P; Spiga, D; Spiropulu, M; Stöckli, F; Traczyk, P; Tropea, P; Troska, J; Tsirou, A; Veillet, L; Veres, G I; Voutilainen, M; Wertelaers, P; Zanetti, M; Bertl, W; Deiters, K; Erdmann, W; Gabathuler, K; Horisberger, R; Ingram, Q; Kaestli, H C; König, S; Kotlinski, D; Langenegger, U; Meier, F; Renker, D; Rohe, T; Sibille, J; Starodumov, A; Betev, B; Caminada, L; Chen, Z; Cittolin, S; Da Silva Di Calafiori, D R; Dambach, S; Dissertori, G; Dittmar, M; Eggel, C; Eugster, J; Faber, G; Freudenreich, K; Grab, C; Hervé, A; Hintz, W; Lecomte, P; Luckey, P D; Lustermann, W; Marchica, C; Milenovic, P; Moortgat, F; Nardulli, A; Nessi-Tedaldi, F; Pape, L; Pauss, F; Punz, T; Rizzi, A; Ronga, F J; Sala, L; Sanchez, A K; Sawley, M C; Sordini, V; Stieger, B; Tauscher, L; Thea, A; Theofilatos, K; Treille, D; Trüb, P; Weber, M; Wehrli, L; Weng, J; Zelepoukine, S; Amsler, C; Chiochia, V; De Visscher, S; Regenfus, C; Robmann, P; Rommerskirchen, T; Schmidt, A; Tsirigkas, D; Wilke, L; Chang, Y H; Chen, E A; Chen, W T; Go, A; Kuo, C M; Li, S W; Lin, W; Bartalini, P; Chang, P; Chao, Y; Chen, K F; Hou, W S; Hsiung, Y; Lei, Y J; Lin, S W; Lu, R S; Schümann, J; Shiu, J G; Tzeng, Y M; Ueno, K; Velikzhanin, Y; Wang, C C; Wang, M; Adiguzel, A; Ayhan, A; Azman Gokce, A; Bakirci, M N; Cerci, S; Dumanoglu, I; Eskut, E; Girgis, S; Gurpinar, E; Hos, I; Karaman, T; Karaman, T; Kayis Topaksu, A; Kurt, P; Önengüt, G; Önengüt Gökbulut, G; Ozdemir, K; Ozturk, S; Polatöz, A; Sogut, K; Tali, B; Topakli, H; Uzun, D; Vergili, L N; Vergili, M; Akin, I V; Aliev, T; Bilmis, S; Deniz, M; Gamsizkan, H; Guler, A M; Öcalan, K; Serin, M; Sever, R; Surat, U E; Zeyrek, M; Deliomeroglu, M; Demir, D; Gülmez, E; Halu, A; Isildak, B; Kaya, M; Kaya, O; Ozkorucuklu, S; Sonmez, N; Levchuk, L; Lukyanenko, S; Soroka, D; Zub, S; Bostock, F; Brooke, J J; Cheng, T L; Cussans, D; Frazier, R; Goldstein, J; Grant, N; Hansen, M; Heath, G P; Heath, H F; Hill, C; Huckvale, B; Jackson, J; Mackay, C K; Metson, S; Newbold, D M; Nirunpong, K; Smith, V J; Velthuis, J; Walton, R; Bell, K W; Brew, C; Brown, R M; Camanzi, B; Cockerill, D J A; Coughlan, J A; Geddes, N I; Harder, K; Harper, S; Kennedy, B W; Murray, P; Shepherd-Themistocleous, C H; Tomalin, I R; Williams, J H; Womersley, W J; Worm, S D; Bainbridge, R; Ball, G; Ballin, J; Beuselinck, R; Buchmuller, O; Colling, D; Cripps, N; Davies, G; Della Negra, M; Foudas, C; Fulcher, J; Futyan, D; Hall, G; Hays, J; Iles, G; Karapostoli, G; MacEvoy, B C; Magnan, A M; Marrouche, J; Nash, J; Nikitenko, A; Papageorgiou, A; Pesaresi, M; Petridis, K; Pioppi, M; Raymond, D M; Rompotis, N; Rose, A; Ryan, M J; Seez, C; Sharp, P; Sidiropoulos, G; Stettler, M; Stoye, M; Takahashi, M; Tapper, A; Timlin, C; Tourneur, S; Vazquez Acosta, M; Virdee, T; Wakefield, S; Wardrope, D; Whyntie, T; Wingham, M; Cole, J E; Goitom, I; Hobson, P R; Khan, A; Kyberd, P; Leslie, D; Munro, C; Reid, I D; Siamitros, C; Taylor, R; Teodorescu, L; Yaselli, I; Bose, T; Carleton, M; Hazen, E; Heering, A H; Heister, A; John, J St; Lawson, P; Lazic, D; Osborne, D; Rohlf, J; Sulak, L; Wu, S; Andrea, J; Avetisyan, A; Bhattacharya, S; Chou, J P; Cutts, D; Esen, S; Kukartsev, G; Landsberg, G; Narain, M; Nguyen, D; Speer, T; Tsang, K V; Breedon, R; Calderon De La Barca Sanchez, M; Case, M; Cebra, D; Chertok, M; Conway, J; Cox, P T; Dolen, J; Erbacher, R; Friis, E; Ko, W; Kopecky, A; Lander, R; Lister, A; Liu, H; Maruyama, S; Miceli, T; Nikolic, M; Pellett, D; Robles, J; Searle, M; Smith, J; Squires, M; Stilley, J; Tripathi, M; Vasquez Sierra, R; Veelken, C; Andreev, V; Arisaka, K; Cline, D; Cousins, R; Erhan, S; Hauser, J; Ignatenko, M; Jarvis, C; Mumford, J; Plager, C; Rakness, G; Schlein, P; Tucker, J; Valuev, V; Wallny, R; Yang, X; Babb, J; Bose, M; Chandra, A; Clare, R; Ellison, J A; Gary, J W; Hanson, G; Jeng, G Y; Kao, S C; Liu, F; Liu, H; Luthra, A; Nguyen, H; Pasztor, G; Satpathy, A; Shen, B C; Stringer, R; Sturdy, J; Sytnik, V; Wilken, R; Wimpenny, S; Branson, J G; Dusinberre, E; Evans, D; Golf, F; Kelley, R; Lebourgeois, M; Letts, J; Lipeles, E; Mangano, B; Muelmenstaedt, J; Norman, M; Padhi, S; Petrucci, A; Pi, H; Pieri, M; Ranieri, R; Sani, M; Sharma, V; Simon, S; Würthwein, F; Yagil, A; Campagnari, C; D'Alfonso, M; Danielson, T; Garberson, J; Incandela, J; Justus, C; Kalavase, P; Koay, S A; Kovalskyi, D; Krutelyov, V; Lamb, J; Lowette, S; Pavlunin, V; Rebassoo, F; Ribnik, J; Richman, J; Rossin, R; Stuart, D; To, W; Vlimant, J R; Witherell, M; Apresyan, A; Bornheim, A; Bunn, J; Chiorboli, M; Gataullin, M; Kcira, D; Litvine, V; Ma, Y; Newman, H B; Rogan, C; Timciuc, V; Veverka, J; Wilkinson, R; Yang, Y; Zhang, L; Zhu, K; Zhu, R Y; Akgun, B; Carroll, R; Ferguson, T; Jang, D W; Jun, S Y; Paulini, M; Russ, J; Terentyev, N; Vogel, H; Vorobiev, I; Cumalat, J P; Dinardo, M E; Drell, B R; Ford, W T; Heyburn, B; Luiggi Lopez, E; Nauenberg, U; Stenson, K; Ulmer, K; Wagner, S R; Zang, S L; Agostino, L; Alexander, J; Blekman, F; Cassel, D; Chatterjee, A; Das, S; Gibbons, L K; Heltsley, B; Hopkins, W; Khukhunaishvili, A; Kreis, B; Kuznetsov, V; Patterson, J R; Puigh, D; Ryd, A; Shi, X; Stroiney, S; Sun, W; Teo, W D; Thom, J; Vaughan, J; Weng, Y; Wittich, P; Beetz, C P; Cirino, G; Sanzeni, C; Winn, D; Abdullin, S; Afaq, M A; Albrow, M; Ananthan, B; Apollinari, G; Atac, M; Badgett, W; Bagby, L; Bakken, J A; Baldin, B; Banerjee, S; Banicz, K; Bauerdick, L A T; Beretvas, A; Berryhill, J; Bhat, P C; Biery, K; Binkley, M; Bloch, I; Borcherding, F; Brett, A M; Burkett, K; Butler, J N; Chetluru, V; Cheung, H W K; Chlebana, F; Churin, I; Cihangir, S; Crawford, M; Dagenhart, W; Demarteau, M; Derylo, G; Dykstra, D; Eartly, D P; Elias, J E; Elvira, V D; Evans, D; Feng, L; Fischler, M; Fisk, I; Foulkes, S; Freeman, J; Gartung, P; Gottschalk, E; Grassi, T; Green, D; Guo, Y; Gutsche, O; Hahn, A; Hanlon, J; Harris, R M; Holzman, B; Howell, J; Hufnagel, D; James, E; Jensen, H; Johnson, M; Jones, C D; Joshi, U; Juska, E; Kaiser, J; Klima, B; Kossiakov, S; Kousouris, K; Kwan, S; Lei, C M; Limon, P; Lopez Perez, J A; Los, S; Lueking, L; Lukhanin, G; Lusin, S; Lykken, J; Maeshima, K; Marraffino, J M; Mason, D; McBride, P; Miao, T; Mishra, K; Moccia, S; Mommsen, R; Mrenna, S; Muhammad, A S; Newman-Holmes, C; Noeding, C; O'Dell, V; Prokofyev, O; Rivera, R; Rivetta, C H; Ronzhin, A; Rossman, P; Ryu, S; Sekhri, V; Sexton-Kennedy, E; Sfiligoi, I; Sharma, S; Shaw, T M; Shpakov, D; Skup, E; Smith, R P; Soha, A; Spalding, W J; Spiegel, L; Suzuki, I; Tan, P; Tanenbaum, W; Tkaczyk, S; Trentadue, R; Uplegger, L; Vaandering, E W; Vidal, R; Whitmore, J; Wicklund, E; Wu, W; Yarba, J; Yumiceva, F; Yun, J C; Acosta, D; Avery, P; Barashko, V; Bourilkov, D; Chen, M; Di Giovanni, G P; Dobur, D; Drozdetskiy, A; Field, R D; Fu, Y; Furic, I K; Gartner, J; Holmes, D; Kim, B; Klimenko, S; Konigsberg, J; Korytov, A; Kotov, K; Kropivnitskaya, A; Kypreos, T; Madorsky, A; Matchev, K; Mitselmakher, G; Pakhotin, Y; Piedra Gomez, J; Prescott, C; Rapsevicius, V; Remington, R; Schmitt, M; Scurlock, B; Wang, D; Yelton, J; Ceron, C; Gaultney, V; Kramer, L; Lebolo, L M; Linn, S; Markowitz, P; Martinez, G; Rodriguez, J L; Adams, T; Askew, A; Baer, H; Bertoldi, M; Chen, J; Dharmaratna, W G D; Gleyzer, S V; Haas, J; Hagopian, S; Hagopian, V; Jenkins, M; Johnson, K F; Prettner, E; Prosper, H; Sekmen, S; Baarmand, M M; Guragain, S; Hohlmann, M; Kalakhety, H; Mermerkaya, H; Ralich, R; Vodopiyanov, I; Abelev, B; Adams, M R; Anghel, I M; Apanasevich, L; Bazterra, V E; Betts, R R; Callner, J; Castro, M A; Cavanaugh, R; Dragoiu, C; Garcia-Solis, E J; Gerber, C E; Hofman, D J; Khalatian, S; Mironov, C; Shabalina, E; Smoron, A; Varelas, N; Akgun, U; Albayrak, E A; Ayan, A S; Bilki, B; Briggs, R; Cankocak, K; Chung, K; Clarida, W; Debbins, P; Duru, F; Ingram, F D; Lae, C K; McCliment, E; Merlo, J P; Mestvirishvili, A; Miller, M J; Moeller, A; Nachtman, J; Newsom, C R; Norbeck, E; Olson, J; Onel, Y; Ozok, F; Parsons, J; Schmidt, I; Sen, S; Wetzel, J; Yetkin, T; Yi, K; Barnett, B A; Blumenfeld, B; Bonato, A; Chien, C Y; Fehling, D; Giurgiu, G; Gritsan, A V; Guo, Z J; Maksimovic, P; Rappoccio, S; Swartz, M; Tran, N V; Zhang, Y; Baringer, P; Bean, A; Grachov, O; Murray, M; Radicci, V; Sanders, S; Wood, J S; Zhukova, V; Bandurin, D; Bolton, T; Kaadze, K; Liu, A; Maravin, Y; Onoprienko, D; Svintradze, I; Wan, Z; Gronberg, J; Hollar, J; Lange, D; Wright, D; Baden, D; Bard, R; Boutemeur, M; Eno, S C; Ferencek, D; Hadley, N J; Kellogg, R G; Kirn, M; Kunori, S; Rossato, K; Rumerio, P; Santanastasio, F; Skuja, A; Temple, J; Tonjes, M B; Tonwar, S C; Toole, T; Twedt, E; Alver, B; Bauer, G; 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 CMS silicon tracker, consisting of 1440 silicon pixel and 15148 silicon strip detector modules, has been aligned using more than three million cosmic ray charged particles, with additional information from optical surveys. The positions of the modules were determined with respect to cosmic ray trajectories to a precision of 3-4 microns RMS in the barrel and 3-14 microns RMS in the endcap in the most sensitive coordinate. The results have been validated by several methods, including the laser alignment system, and compared with predictions obtained from simulation. Correlated systematic effects have been investigated. The track parameter resolutions obtained with this alignment are close to the design performance.

  18. Alignment procedures for the CMS Silicon Tracker detector during pp collisions

    CERN Document Server

    Castello, Roberto

    2012-01-01

    The CMS all-silicon tracker consists of 16588 modules: aligning them with the desired precision of a few micrometers is only feasible using track based alignment procedures. Ultimate precision is now achieved by the determination of sensor curvatures in addition to the local translation and rotation of modules in space. This challenges the alignment algorithms to determine about 200 000 parameters simultaneously. This is achieved using a standalone algorithm exploiting a global fit approach, interfaced with CMS software. The alignment of the detector is also monitored using its built in Laser Alignment System. The main remaining challenge for the alignment are global distortions that systematically bias the track parameters and thus physics measurements. These distortions are controlled by adding further information into the alignment workflow, e.g. the mass of decaying resonances. The orientation of the tracker with respect to the magnetic field of CMS is determined with a stand-alone chi-square minimizatio...

  19. The Phase-1 upgrade of the CMS silicon pixel detector

    CERN Document Server

    Menichelli, Mauro

    2015-01-01

    The present CMS pixel detector will be replaced in the shutdown period 2016/17 by an upgraded version due to the following reasons: increased luminosity at reduced bunch spacing ( from 7 x 10 33 cm - 2 s - 1 at 50 ns bunch spacing to 2 x 10 34 cm - 2 s - 1 at 25 ns bunch spacing) in the LHC , and radiation damage effects that will significantly degrade the present detector. The new upgraded detector will have higher tracking efficiency and lower mass with four barrel layer and three forward/backward disks to provide higher hit pixel coverage out to pseudorapidities of ±2.5. In this paper we will describe the new pixel detector focus ing mostly on the barrel detector design, construction and expected performances

  20. Web-based monitoring tools for Resistive Plate Chambers in the CMS experiment at CERN

    International Nuclear Information System (INIS)

    The Resistive Plate Chambers (RPC) are used in the CMS experiment at the trigger level and also in the standard offline muon reconstruction. In order to guarantee the quality of the data collected and to monitor online the detector performance, a set of tools has been developed in CMS which is heavily used in the RPC system. The Web-based monitoring (WBM) is a set of java servlets that allows users to check the performance of the hardware during data taking, providing distributions and history plots of all the parameters. The functionalities of the RPC WBM monitoring tools are presented along with studies of the detector performance as a function of growing luminosity and environmental conditions that are tracked over time

  1. Web-based monitoring tools for Resistive Plate Chambers in the CMS experiment at CERN

    CERN Document Server

    Kim, Min Suk

    2014-01-01

    The Resistive Plate Chambers (RPC) are used in the CMS experiment at the trigger level and also in the standard offline muon reconstruction. In order to guarantee the quality of the data collected and to monitor online the detector performance, a set of tools has been developed in CMS which is heavily used in the RPC system. The Web-based monitoring (WBM) is a set of java servlets that allows users to check the performance of the hardware during data taking, providing distributions and history plots of all the parameters. The functionalities of the RPC WBM monitoring tools are presented along with studies of the detector performance as a function of growing luminosity and environmental conditions that are tracked over time.

  2. Test of CMS tracker silicon detector modules with the ARC readout system

    CERN Document Server

    Axer, M; Flügge, G; Franke, T; Hegner, B; Hermanns, T; Kasselmann, S T; Mnich, J; Nowack, A; Pooth, O; Pottgens, M

    2004-01-01

    The CMS tracker will be equipped with 16,000 silicon microstrip detector modules covering a surface of approximately 220 m**2. For quality control, a compact and inexpensive DAQ system is needed to monitor the mass production in industry and in the CMS production centres. To meet these requirements a set-up called APV Readout Controller (ARC) system was developed and distributed among all collaborating institutes to perform full readout tests of hybrids and modules at each production step. The system consists of all necessary hardware components, C++ based readout software using LabVIEW **1 Lab VIEW is a product of National Instruments, Austin, USA. as graphical user interface and provides full database connection to track every single module component during the production phase. Two preseries of Tracker End Cap (TEC) silicon detector modules have been produced by the TEC community and tested with the ARC system at Aachen. The results of the second series are presented.

  3. Signal-to-Noise Evaluations for the CMS Silicon Microstrip Detectors

    CERN Document Server

    Bozzi, Concezio

    1997-01-01

    This note gathers the existing information on the parameters of the CMS silicon microstrip detectors, in order to compute the signal-to-noise ratio for different configurations. Both signal and noise are computed analytically, starting from laboratory measurements of the characteristic impedances of the detectors. Results are presented for a 50 micron strip pitch detector, read out every strip and every second strip, and for a 100 micron pitch detector read out every second strip.

  4. Stand-alone Cosmic Muon Reconstruction Before Installation of the CMS Silicon Strip Tracker

    CERN Document Server

    Adam, W; Dragicevic, M; Friedl, M; Fruhwirth, R; Hansel, S; Hrubec, J; Krammer, M; Oberegger, M; Pernicka, M; Schmid, S; Stark, RS; Steininger, H; Uhl, D; Waltenberger, W; Widl, E; Van Mechelen, P; Cardaci, M; Beaumont, W; de Langhe, E; de Wolf, E A; Delmeire, E; Hashemi, M; Bouhali, O; Charaf, O; Clerbaux, B; Dewulf, J P; Elgammal, S; Hammad, G; de Lentdecker, G; Marage, P; Vander Velde, C; Vanlaer, P; Wickens, J; Adler, V; Devroede, O; De Weirdt, S; D'Hondt, J; Goorens, R; Heyninck, J; Maes, J; Mozer, M; Tavernier, S; Van Lancker, L; Van Mulders, P; Villella, I; Wastiels, C; Bonnet, J L; Bruno, G; De Callatay, B; Florins, B; Giammanco, A; Gregoire, G; Keutgen, Th; Kcira, D; Lemaitre, V; Michotte, D; Militaru, O; Piotrzkowski, K; Quertermont, L; Roberfroid, V; Rouby, X; Teyssier, D; Daubie, E; Anttila, E; Czellar, S; Engstrom, P; Harkonen, J; Karimaki, V; Kostesmaa, J; Kuronen, A; Lampen, T; Linden, T; Luukka, P R; Maenpaa, T; Michal, S; Tuominen, E; Tuominiemi, J; Ageron, M; Baulieu, G; Bonnevaux, A; Boudoul, G; Chabanat, E; Chabert, E; Chierici, R; Contardo, D; Della Negra, R; Dupasquier, T; Gelin, G; Giraud, N; Guillot, G; Estre, N; Haroutunian, R; Lumb, N; Perries, S; Schirra, F; Trocme, B; Vanzetto, S; Agram, J L; Blaes, R; Drouhin, F; Ernenwein, J P; Fontaine, J C; Berst, J D; Brom, J M; Didierjean, F; Goerlach, U; Graehling, P; Gross, L; Hosselet, J; Juillot, P; Lounis, A; Maazouzi, C; Olivetto, C; Strub, R; Van Hove, P; Anagnostou, G; Brauer, R; Esser, H; Feld, L; Karpinski, W; Klein, K; Kukulies, C; Olzem, J; Ostapchuk, A; Pandoulas, D; Pierschel, G; Raupach, F; Schael, S; Schwering, G; Sprenger, D; Thomas, M; Weber, M; Wittmer, B; Wlochal, M; Beissel, F; Bock, E; Flugge, G; Gillissen, C; Hermanns, T; Heydhausen, D; Jahn, D; Kaussen, G; Linn, A; Perchalla, L; Poettgens, M; Pooth, O; Stahl, A; Zoeller, M H; Buhmann, P; Butz, E; Flucke, G; Hamdorf, R; Hauk, J; Klanner, R; Pein, U; Schleper, P; Steinbruck, G; Blum, P; De Boer, W; Dierlamm, A; Dirkes, G; Fahrer, M; Frey, M; Furgeri, A; Hartmann, F; Heier, S; Hoffmann, K H; Kaminski, J; Ledermann, B; Liamsuwan, T; Muller, S; Muller, Th; Schilling, F P; Simonis, H J; Steck, P; Zhukov, V; Cariola, P; De Robertis, G; Ferorelli, R; Fiore, L; Preda, M; Sala, G; Silvestris, L; Tempesta, P; Zito, G; Creanza, D; De Filippis, N; De Palma, M; Giordano, D; Maggi, G; Manna, N; My, S; Selvaggi, G; Albergo, S; Chiorboli, M; Costa, S; Galanti, M; Giudice, N; Guardone, N; Noto, F; Potenza, R; Saizu, M A; Sparti, V; Sutera, C; Tricomi, A; Tuve, C; Brianzi, M; Civinini, C; Maletta, F; Manolescu, F; Meschini, M; Paoletti, S; Sguazzoni, G; Broccolo, B; Ciulli, V; D'Alessandro, R; Focardi, E; Frosali, S; Genta, C; Landi, G; Lenzi, P; Macchiolo, A; Magini, N; Parrini, G; Scarlini, E; Cerati, G; Azzi, P; Bacchetta, N; Candelori, A; Dorigo, T; Kaminsky, A; Karaevski, S; Khomenkov, V; Reznikov, S; Tessaro, M; Bisello, D; De Mattia, M; Giubilato, P; Loreti, M; Mattiazzo, S; Nigro, M; Paccagnella, A; Pantano, D; Pozzobon, N; Tosi, M; Bilei, G M; Checcucci, B; Fano, L; Servoli, L; Ambroglini, F; Babucci, E; Benedetti, D; Biasini, M; Caponeri, B; Covarelli, R; Giorgi, M; Lariccia, P; Mantovani, G; Marcantonini, M; Postolache, V; Santocchia, A; Spiga, D; Bagliesi, G; Balestri, G; Berretta, L; Bianucci, S; Boccali, T; Bosi, F; Bracci, F; Castaldi, R; Ceccanti, M; Cecchi, R; Cerri, C; Cucoanes, A S; Dell'Orso, R; Dobur, D; Dutta, S; Giassi, A; Giusti, S; Kartashov, D; Kraan, A; Lomtadze, T; Lungu, G A; Magazzu, G; Mammini, P; Mariani, F; Martinelli, G; Moggi, A; Palla, F; Palmonari, F; Petragnani, G; Profeti, A; Raffaelli, F; Rizzi, D; Sanguinetti, G; Sarkar, S; Sentenac, D; Serban, A T; Slav, A; Soldani, A; Spagnolo, P; Tenchini, R; Tolaini, S; Venturi, A; Verdini, P G; Vos, M; Zaccarelli, L; Avanzini, C; Basti, A; Benucci, L; Bocci, A; Cazzola, U; Fiori, F; Linari, S; Massa, M; Messineo, A; Segneri, G; Tonelli, G; Azzurri, P; Bernardini, J; Borrello, L; Calzolari, F; Foa, L; Gennai, S; Ligabue, F; Petrucciani, G; Rizzi, A; Yang, Z; Benotto, F; Demaria, N; Dumitrache, F; Farano, R; Borgia, M A; Castello, R; Costa, M; Migliore, E; Romero, A; Abbaneo, D; Abbas, M; Ahmed, I; Akhtar, I; Albert, E; Bloch, C; Breuker, H; Butt, S; Buchmuller, O; Cattai, A; Delaere, C; Delattre, M; Edera, L M; Engstrom, P; Eppard, M; Gateau, M; Gill, K; Giolo-Nicollerat, A S; Grabit, R; Honma, A; Huhtinen, M; Kloukinas, K; Kortesmaa, J; Kottelat, L J; Kuronen, A; Leonardo, N; Ljuslin, C; Mannelli, M; Masetti, L; Marchioro, A; Mersi, S; Michal, S; Mirabito, L; Muffat-Joly, J; Onnela, A; Paillard, C; Pal, I; Pernot, J F; Petagna, P; Petit, P; Piccut, C; Pioppi, M; Postema, H; Ranieri, R; Ricci, D; Rolandi, G; Ronga, F; Sigaud, C; Syed, A; Siegrist, P; Tropea, P; Troska, J; Tsirou, A; Vander Donckt, M; Vasey, F; Alagoz, E; Amsler, C; Chiochia, V; Regenfus, Christian; Robmann, P; Rochet, J; Rommerskirchen, T; Schmidt, A; Steiner, S; Wilke, L; Church, I; Cole, J; Coughlan, J; Gay, A; Taghavi, S; Tomalin, I; Bainbridge, R; Cripps, N; Fulcher, J; Hall, G; Noy, M; Pesaresi, M; Radicci, V; Raymond, D M; Sharp, P; Stoye, M; Wingham, M; Zorba, O; Goitom, I; Hobson, P R; Reid, I; Teodorescu, L; Hanson, G; Jeng, G Y; Liu, H; Pasztor, G; Satpathy, A; Stringer, R; Mangano, B; Affolder, K; Affolder, T; Allen, A; Barge, D; Burke, S; Callahan, D; Campagnari, C; Crook, A; D'Alfonso, M; Dietch, J; Garberson, Jeffrey Ford; Hale, D; Incandela, H; Incandela, J; Jaditz, S; Kalavase, P; Kreyer, S; Kyre, S; Lamb, J; Mc Guinness, C; Mills, C; Nguyen, H; Nikolic, M; Lowette, S; Rebassoo, F; Ribnik, J; Richman, J; Rubinstein, N; Sanhueza, S; Shah, Y; Simms, L; Staszak, D; Stoner, J; Stuart, D; Swain, S; Vlimant, J R; White, D; Ulmer, K A; Wagner, S R; Bagby, L; Bhat, P C; Burkett, K; Cihangir, S; Gutsche, O; Jensen, H; Johnson, M; Luzhetskiy, N; Mason, D; Miao, T; Moccia, S; Noeding, C; Ronzhin, A; Skup, E; Spalding, W J; Spiegel, L; Tkaczyk, S; Yumiceva, F; Zatserklyaniy, A; Zerev, E; Anghel, I; Bazterra, V E; Gerber, C E; Khalatian, S; Shabalina, E; Baringer, P; Bean, A; Chen, J; Hinchey, C; Martin, C; Moulik, T; Robinson, R; Gritsan, A V; Lae, C K; Tran, N V; Everaerts, P; Hahn, K A; Harris, P; Nahn, S; Rudolph, M; Sung, K; Betchart, B; Demina, R; Gotra, Y; Korjenevski, S; Miner, D; Orbaker, D; Christofek, L; Hooper, R; Landsberg, G; Nguyen, D; Narain, M; Speer, T; Tsang, K V

    2009-01-01

    The subsystems of the CMS silicon strip tracker were integrated and commissioned at the Tracker Integration Facility (TIF) in the period from November 2006 to July 2007. As part of the commissioning, large samples of cosmic ray data were recorded under various running conditions in the absence of a magnetic field. Cosmic rays detected by scintillation counters were used to trigger the readout of up to 15% of the final silicon strip detector, and over 4.7 million events were recorded. This document describes the cosmic track reconstruction and presents results on the performance of track and hit reconstruction as from dedicated analyses.

  5. 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.

  6. Charged particle detection performance of gas electron multiplier detector for the upgrade of CMS endcap muon system at the CERN LHC

    CERN Document Server

    CMS Collaboration

    2015-01-01

    The CMS detector is one of two general-purpose detectors at the CERN LHC. LHC will provide exceptional high instantaneous and integrated luminosities after second long shutdown. The forward region $\\mid \\eta \\mid \\geq 1.5$ of the CMS detector will face extremely high particle rates in 10s of kHz/cm2 and hence it will affect the momentum resolution and longevity of the muon detectors. To overcome these issues, the CMS-GEM collaboration has proposed to install new large size high rate capable triple Gas Electron Multiplier (GEM) detectors in the forward region of CMS muon system. The proposal has been approved recently. The first set of Triple GEM detectors will be installed in the GE1/1 region ($1.6 < \\mid \\eta \\mid < 2.2$) of muon endcap during phase-II upgrade of the LHC. Towards this goal, full size CMS Triple GEM prototype chambers have been fabricated and put under the test beam at the CERN SPS test beam facility. The GEM detectors were operated with two gas mixtures: Ar:CO2 (70:30) and Ar:CO2:CF4 (...

  7. Calibration and alignment of the CMS silicon tracking detector

    Energy Technology Data Exchange (ETDEWEB)

    Stoye, M.

    2007-07-15

    The Large Hadron Collider (LHC) will dominate the high energy physics program in the coming decade. The discovery of the standard model Higgs boson and the discovery of super-symmetric particles are within the reach at the energy scale explored by the LHC. However, the high luminosity and the high energy of the colliding protons lead to challenging demands on the detectors. The hostile radiation environment requires irradiation hard detectors, where the innermost subdetectors, consisting of silicon modules, are most affected. This thesis is devoted to the calibration and alignment of the silicon tracking detector. Electron test beam data, taken at DESY, have been used to investigate the performance of detector modules which previously were irradiated with protons up to a dose expected after 10 years of operation. The irradiated sensors turned out to be still better than required. The performance of the inner tracking systems will be dominated by the degree to which the positions of the sensors can be determined. Only a track based alignment procedure can reach the required precision. Such an alignment procedure is a major challenge given that about 50000 geometry constants need to be measured. Making use of the novel {chi}{sup 2} minimization program Millepede II an alignment strategy has been developed in which all detector components are aligned simultaneously, as many sources of information as possible are used, and all correlations between the position parameters of the detectors are taken into account. Utilizing simulated data, a proof of concept of the alignment strategy is shown. (orig.)

  8. Calibration and alignment of the CMS silicon tracking detector

    International Nuclear Information System (INIS)

    The Large Hadron Collider (LHC) will dominate the high energy physics program in the coming decade. The discovery of the standard model Higgs boson and the discovery of super-symmetric particles are within the reach at the energy scale explored by the LHC. However, the high luminosity and the high energy of the colliding protons lead to challenging demands on the detectors. The hostile radiation environment requires irradiation hard detectors, where the innermost subdetectors, consisting of silicon modules, are most affected. This thesis is devoted to the calibration and alignment of the silicon tracking detector. Electron test beam data, taken at DESY, have been used to investigate the performance of detector modules which previously were irradiated with protons up to a dose expected after 10 years of operation. The irradiated sensors turned out to be still better than required. The performance of the inner tracking systems will be dominated by the degree to which the positions of the sensors can be determined. Only a track based alignment procedure can reach the required precision. Such an alignment procedure is a major challenge given that about 50000 geometry constants need to be measured. Making use of the novel χ2 minimization program Millepede II an alignment strategy has been developed in which all detector components are aligned simultaneously, as many sources of information as possible are used, and all correlations between the position parameters of the detectors are taken into account. Utilizing simulated data, a proof of concept of the alignment strategy is shown. (orig.)

  9. The central trigger control system of the CMS experiment at CERN

    International Nuclear Information System (INIS)

    The Large Hadron Collider will deliver up to 32 million physics collisions per second. This rate is far too high to be processed by present-day computer farms, let alone stored on disk by the experiments for offline analysis. A fast selection of interesting events must therefore be made. In the CMS experiment, this is implemented in two stages: the Level-1 Trigger of the CMS experiment uses custom-made, fast electronics, while the experiment's high-level trigger is implemented in computer farms. The Level-1 Global Trigger electronics has to receive signals from the subdetector systems that enter the trigger (mostly from muon detectors and calorimeters), synchronize them, determine if a pre-set trigger condition is fulfilled, check if the various subsystems are ready to accept triggers based on information from the Trigger Throttling System and on calculations of possible dead-times, and finally distribute the trigger decision ('Level-1 Accept') together with timing signals to the subdetectors over the so-called ''Trigger, Timing and Control'' distribution tree of the experiment. These functions are fulfilled by several specialized, custom-made VME modules, most of which are housed in one crate. The overall control is exerted by the central 'Trigger Control System', which is described in this paper. It consists of one main module and several ancillary boards for input and output functions.

  10. Muon flux measurement with silicon detectors in the CERN neutrino beams

    International Nuclear Information System (INIS)

    The neutrino beam installations at the CERN SPS accelerator are described, with emphasis on the beam monitoring systems. Especially the muon flux measurement system is considered in detail, and the calibration procedure and systematic aspects of the measurements are discussed. An introduction is given to the use of silicon semiconductor detectors and their related electronics. Other special chapters concern non-linear phenomena in the silicon detectors, radiation damage in silicon detectors, energy loss and energy deposition in silicon and a review of energy loss phenomena for high energy muons in matter. (orig.)

  11. 7 April 2010 - Rector, Ghent University, P. Van Cauwenberge with CERN Director-General R. Heuer and Coordinator for external relations F. Pauss, visiting CMS control room at Point 5 with Collaboration Deputy Spokesperson A. De Roeck.

    CERN Multimedia

    Maximilien Brice

    2010-01-01

    7 April 2010 - Rector, Ghent University, P. Van Cauwenberge with CERN Director-General R. Heuer and Coordinator for external relations F. Pauss, visiting CMS control room at Point 5 with Collaboration Deputy Spokesperson A. De Roeck.

  12. 4 July 2013- European Commission DG CONNECT Director-General R. Madelin, signing the guest book with CERN Director-General R. Heuer and visiting CMS experimental area with Collaboration Deputy Spokesperson J. Varela.

    CERN Multimedia

    Maximilien Brice

    2013-01-01

    4 July 2013- European Commission DG CONNECT Director-General R. Madelin, signing the guest book with CERN Director-General R. Heuer and visiting CMS experimental area with Collaboration Deputy Spokesperson J. Varela.

  13. CMS DOCUMENTATION

    CERN Multimedia

    CMS TALKS AT MAJOR MEETINGS The agenda and talks from major CMS meetings can now be electronically accessed from the iCMS Web site. The following items can be found on: http://cms.cern.ch/iCMS/ General - CMS Weeks (Collaboration Meetings), CMS Weeks Agendas The talks presented at the Plenary Sessions. LHC Symposiums Management - CB - MB - FB - FMC Agendas and minutes are accessible to CMS members through their AFS account (ZH). However some linked documents are restricted to the Board Members. FB documents are only accessible to FB members. LHCC The talks presented at the ‘CMS Meetings with LHCC Referees’ are available on request from the PM or MB Country Representative. Annual Reviews The talks presented at the 2006 Annual reviews are posted. CMS DOCUMENTS It is considered useful to establish information on the first employment of CMS doctoral students upon completion of their theses. Therefore it is requested that Ph.D students inform the CMS Secretariat about the na...

  14. CMS DOCUMENTATION

    CERN Multimedia

    CMS TALKS AT MAJOR MEETINGS The agenda and talks from major CMS meetings can now be electronically accessed from the iCMS Web site. The following items can be found on: http://cms.cern.ch/iCMS/ Management- CMS Weeks (Collaboration Meetings), CMS Weeks Agendas The talks presented at the Plenary Sessions. Management - CB - MB - FB Agendas and minutes are accessible to CMS members through their AFS account (ZH). However some linked documents are restricted to the Board Members. FB documents are only accessible to FB members. LHCC The talks presented at the ‘CMS Meetings with LHCC Referees’ are available on request from the PM or MB Country Representative. Annual Reviews The talks presented at the 2007 Annual reviews are posted. CMS DOCUMENTS It is considered useful to establish information on the first employment of CMS doctoral students upon completion of their theses. Therefore it is requested that Ph.D students inform the CMS Secretariat about the nature of employment and ...

  15. CMS DOCUMENTATION

    CERN Multimedia

    CMS TALKS AT MAJOR MEETINGS The agenda and talks from major CMS meetings can now be electronically accessed from the iCMS Web site. The following items can be found on: http://cms.cern.ch/iCMS/ General - CMS Weeks (Collaboration Meetings), CMS Weeks Agendas The talks presented at the Plenary Sessions. LHC Symposiums Management - CB - MB - FB - FMC Agendas and minutes are accessible to CMS members through their AFS account (ZH). However some linked documents are restricted to the Board Members. FB documents are only accessible to FB members. LHCC The talks presented at the ‘CMS Meetings with LHCC Referees’ are available on request from the PM or MB Country Representative. Annual Reviews The talks presented at the 2006 Annual reviews are posted. CMS DOCUMENTS It is considered useful to establish information on the first employment of CMS doctoral students upon completion of their theses. Therefore it is requested that Ph.D students inform the CMS Secretariat about the natu...

  16. CMS DOCUMENTATION

    CERN Document Server

    CMS TALKS AT MAJOR MEETINGS The agenda and talks from major CMS meetings can now be electronically accessed from the iCMS Web site. The following items can be found on: http://cms.cern.ch/iCMS/ General - CMS Weeks (Collaboration Meetings), CMS Weeks Agendas The talks presented at the Plenary Sessions. LHC Symposiums Management - CB - MB - FB - FMC Agendas and minutes are accessible to CMS members through their AFS account (ZH). However some linked documents are restricted to the Board Members. FB documents are only accessible to FB members. LHCC The talks presented at the ‘CMS Meetings with LHCC Referees’ are available on request from the PM or MB Country Representative. Annual Reviews The talks presented at the 2006 Annual reviews are posted. CMS DOCUMENTS It is considered useful to establish information on the first employment of CMS doctoral students upon completion of their theses. Therefore it is requested that Ph.D students inform the CMS Secretariat about the natur...

  17. CMS DOCUMENTATION

    CERN Multimedia

    CMS TALKS AT MAJOR MEETINGS The agenda and talks from major CMS meetings can now be electronically accessed from the iCMS Web site. The following items can be found on: http://cms.cern.ch/iCMS/ General - CMS Weeks (Collaboration Meetings), CMS Weeks Agendas The talks presented at the Plenary Sessions. LHC Symposiums Management - CB - MB - FB - FMC Agendas and minutes are accessible to CMS members through their AFS account (ZH). However some linked documents are restricted to the Board Members. FB documents are only accessible to FB members. LHCC The talks presented at the ‘CMS Meetings with LHCC Referees’ are available on request from the PM or MB Country Representative. Annual Reviews The talks presented at the 2006 Annual reviews are posted.   CMS DOCUMENTS It is considered useful to establish information on the first employment of CMS doctoral students upon completion of their theses. Therefore it is requested that Ph.D students inform the CMS Secretariat a...

  18. CMS DOCUMENTATION

    CERN Multimedia

    CMS TALKS AT MAJOR MEETINGS The agenda and talks from major CMS meetings can now be electronically accessed from the iCMS Web site. The following items can be found on: http://cms.cern.ch/iCMS/ Management- CMS Weeks (Collaboration Meetings), CMS Weeks Agendas The talks presented at the Plenary Sessions. Management - CB - MB - FB Agendas and minutes are accessible to CMS members through their AFS account (ZH). However some linked documents are restricted to the Board Members. FB documents are only accessible to FB members. LHCC The talks presented at the ‘CMS Meetings with LHCC Referees’ are available on request from the PM or MB Country Representative. Annual Reviews The talks presented at the 2007 Annual reviews are posted. CMS DOCUMENTS It is considered useful to establish information on the first employment of CMS doctoral students upon completion of their theses. Therefore it is requested that Ph.D students inform the CMS Secretariat about the nature of em¬pl...

  19. Development and evaluation of test stations for the quality assurance of the silicon micro-strip detector modules for the CMS experiment

    International Nuclear Information System (INIS)

    CMS (Compact Muon Solenoid) is one of four large-scale detectors which will be operated at the LHC (Large Hadron Collider) at the European Laboratory for Particle Physics (CERN). For the search for new physics the reconstruction of the collision products and their properties is essential. In the innermost part of the CMS detector the traces of ionizing particles are measured utilizing a silicon tracker. A large fraction of this detector is equipped with silicon micro-strip modules which provide a precise space resolution in 1-dimension. A module consists of a sensor for detection of particles, the corresponding read-out electronics (hybrid) and a mechanical support structure. Since the 15,148 modules, which will be installed in the silicon micro-strip detector, have a total sensitive surface area of about 198 m2, the inner tracker of CMS is the largest silicon tracking detector, which has ever been built. While the sensors and hybrids are produced in industry, the construction of the modules and the control of the quality is done by the members of the 21 participating institutes. Since the access to the silicon micro-strip tracker will be very limited after the installation in the CMS detector the installed modules must be of high quality. For this reason the modules are thoroughly tested and the test results are uploaded to a central database. By the development of a read-out system and the corresponding software the III. Physikalisches Institut made an important contribution for the electrical and functional quality control of hybrids and modules. The read-out system provides all features for the operation and test of hybrids and modules and stands out due to high reliability and simple handling. Because a very user-friedly and highly automated software it became the official test tool and was integrated in various test stands. The test stands, in which the read-out system is integrated in, are described and the tests which are implemented in the corresponding

  20. Development and implementation of quality control strategies for CMS silicon strip tracker modules

    CERN Document Server

    Dirkes, Guido

    The LHC will explore physics at the energy frontier and will address many open questions in particle physics, like the search for the Higgs boson or Supersymmetry. For both high resolution track and vertex reconstruction is vital. The CMS silicon tracker consists of 15232 detector modules. Production and assembly of these will span two and a half years period, during which the quality control chain has to ensure functionality and reliability of the modules produced. The CMS group in Karlsruhe will produce and qualify 1600 modules. Therefore automatic test systems are developed and test strategies are worked out. Already during the RnD phase, first prototype tests were performed and some weak points of the design were uncovered. Two test stations are built. One focuses on a fast functionality test, including an active thermal cycle. The other focuses on debugging and repair requirements, including additional test options with lasers, radioactive sources, probes and infrared LEDs. For quality control measuremen...

  1. One year of FBG-based thermo-hygrometers in operation in the CMS experiment at CERN

    Science.gov (United States)

    Berruti, Gaia Maria; Petagna, Paolo; Buontempo, Salvatore; Makovec, Alajos; Szillasi, Zoltan; Beni, Noemi; Consales, Marco; Cusano, Andrea

    2016-03-01

    In this contribution we present results concerning the very first application of fiber optic sensors (FOSs) for relative humidity (RH) monitoring in high radiations environments. After a few years of investigations at CERN in Geneva, since December 2013 our multidisciplinary research group has successfully installed 72 thermo-hygrometers based on Fiber Bragg Grating (FBG) technology, organized in multi-points arrays, in cold areas of the Tracker Bulkhead of the Compact Muon Solenoid (CMS) experiment, where hundreds of electrical connectors are housed and thousands of services, including many cold pipes, cross the volumes through them. In such a complicated environment, a constant hygrometric monitoring is vital, in order to avoid dangerous phenomena of condensation. The collected results in the last year of operation of the proposed sensors are effective and reliable, with temperature, relative humidity and dew point temperature measurements from the FBG-based devices in full agreement with the readings of conventional sensors, temporarily present in the detector. However, experience in operation has shown some limitations of this technology, which are fully detailed in the last section of the paper.

  2. One year of FBG-based thermo-hygrometers in operation in the CMS experiment at CERN

    International Nuclear Information System (INIS)

    In this contribution we present results concerning the very first application of fiber optic sensors (FOSs) for relative humidity (RH) monitoring in high radiations environments. After a few years of investigations at CERN in Geneva, since December 2013 our multidisciplinary research group has successfully installed 72 thermo-hygrometers based on Fiber Bragg Grating (FBG) technology, organized in multi-points arrays, in cold areas of the Tracker Bulkhead of the Compact Muon Solenoid (CMS) experiment, where hundreds of electrical connectors are housed and thousands of services, including many cold pipes, cross the volumes through them. In such a complicated environment, a constant hygrometric monitoring is vital, in order to avoid dangerous phenomena of condensation. The collected results in the last year of operation of the proposed sensors are effective and reliable, with temperature, relative humidity and dew point temperature measurements from the FBG-based devices in full agreement with the readings of conventional sensors, temporarily present in the detector. However, experience in operation has shown some limitations of this technology, which are fully detailed in the last section of the paper

  3. Sources of machine-induced background in the ATLAS and CMS detectors at the CERN Large Hadron Collider

    Energy Technology Data Exchange (ETDEWEB)

    Bruce, R.; et al.,

    2013-11-21

    One source of experimental background in the CERN Large Hadron Collider (LHC) is particles entering the detectors from the machine. These particles are created in cascades, caused by upstream interactions of beam protons with residual gas molecules or collimators. We estimate the losses on the collimators with SixTrack and simulate the showers with FLUKA and MARS to obtain the flux and distribution of particles entering the ATLAS and CMS detectors. We consider some machine configurations used in the first LHC run, with focus on 3.5 TeV operation as in 2011. Results from FLUKA and MARS are compared and a very good agreement is found. An analysis of logged LHC data provides, for different processes, absolute beam loss rates, which are used together with further simulations of vacuum conditions to normalize the results to rates of particles entering the detectors. We assess the relative importance of background from elastic and inelastic beam-gas interactions, and the leakage out of the LHC collimation system, and show that beam-gas interactions are the dominating source of machine-induced background for the studied machine scenarios. Our results serve as a starting point for the experiments to perform further simulations in order to estimate the resulting signals in the detectors.

  4. The CMS tracker and its performance

    International Nuclear Information System (INIS)

    The compact muon solenoid CMS is one of the two general purpose detectors planned at the large hadron collider at CERN. The main physics goals of CMS include the search for the Higgs boson, for signs beyond the standard model and an accurate measurement of CP violation in the b-system. These goals and the hostile radiation environment at the LHC represent a challenge for the tracker which will utilise a system of silicon pixel detectors, silicon strip detectors and microstrip gas chambers. The design of the tracker and its performance in selected aspects of b-physics are presented in this paper. (orig.)

  5. CMS DOCUMENTATION

    CERN Multimedia

    CMS TALKS AT MAJOR MEETINGS The agenda and talks from major CMS meetings can now be electronically accessed from the ICMS Web site. The following items can be found on: http://cms.cern.ch/iCMS Management – CMS Weeks (Collaboration Meetings), CMS Weeks Agendas The talks presented at the Plenary Sessions. Management – CB – MB – FB Agendas and minutes are accessible to CMS members through Indico. LHCC The talks presented at the ‘CMS Meetings with LHCC Referees’ are available on request from the PM or MB Country Representative. Annual Reviews The talks presented at the 2008 Annual Reviews are posted in Indico. CMS DOCUMENTS It is considered useful to establish information on the first employment of CMS doctoral student upon completion of their theses.  Therefore it is requested that Ph.D students inform the CMS Secretariat about the nature of employment and name of their first employer. The Notes, Conference Reports and Theses published si...

  6. 23rd June 2010 - University of Bristol Head of the Aerospace Engineering Department and Professor of Aerospace Dynamics N. Lieven visiting CERN control centre with Beams Department Head P. Collier, visiting the LHC superconducting magnet test hall with R. Veness and CMS control centre with Collaboration Spokesperson G. Tonelli and CMS User J. Goldstein.

    CERN Multimedia

    Jean-Claude Gadmer

    2010-01-01

    23rd June 2010 - University of Bristol Head of the Aerospace Engineering Department and Professor of Aerospace Dynamics N. Lieven visiting CERN control centre with Beams Department Head P. Collier, visiting the LHC superconducting magnet test hall with R. Veness and CMS control centre with Collaboration Spokesperson G. Tonelli and CMS User J. Goldstein.

  7. 17 September 2013 - Estonian Minister of Education and Research J. Aaviksoo signing the guest book with CERN Director-General R- Heuer; visiting the TOTEM facility with TOTEM Collaboration Spokesperson S. Giani; in the LHC tunnel at Point 5 with International Relations Adviser T. Kurtyka and visiting the CMS cavern with CMS Collaboration Spokesperson J. Incandela. International Relations Adviser R. Voss present.

    CERN Multimedia

    Anna Pantelia

    2013-01-01

    17 September 2013 - Estonian Minister of Education and Research J. Aaviksoo signing the guest book with CERN Director-General R- Heuer; visiting the TOTEM facility with TOTEM Collaboration Spokesperson S. Giani; in the LHC tunnel at Point 5 with International Relations Adviser T. Kurtyka and visiting the CMS cavern with CMS Collaboration Spokesperson J. Incandela. International Relations Adviser R. Voss present.

  8. Investigation of the charge collection for strongly irradiated silicon strip detectors of the CMS ECAL Preshower

    International Nuclear Information System (INIS)

    Strongly irradiated (2.3·1014 n/cm2) silicon strip detectors of different size, thickness and different design options were tested in a muon beam at CERN in 1999. A charge collection efficiency in excess of 85% and a signal-to-noise ratio of about 6 are obtained in all cases at high enough bias voltage. Details of the charge collection in the interstrip and the guard ring region and cross-talk between strips were also studied. We find that the charge collection efficiency and the cross-talk between strips depend on the interstrip distance

  9. Investigation of the charge collection for strongly irradiated Silicon strip detectors of the CMS ECAL Preshower

    CERN Document Server

    CERN. Geneva

    2000-01-01

    Strongly irradiated silicon strip detectors of different size, thickness and different design options were tested in a muon beam at CERN in 1999. A charge collection efficiency in excess of 85% and a signal to noise ratio of 6 are obtained in all cases at high enough bias voltage. Details of the charge collection in the inter-strip and the guard ring region and crosstalk between strips were also studied. We find that the charge collection efficiency and the cross talk between strips depend on the interstrip distance.

  10. Characterization of silicon sensor materials and designs for the CMS Tracker Upgrade

    CERN Document Server

    Dierlamm, Alexander Hermann

    2012-01-01

    During the high luminosity phase of the LHC (HL-LHC, starting around 2020) the inner tracking system of CMS will be exposed to harsher conditions than the current system was designed for. Therefore a new tracker is planned to cope with higher radiation levels and higher occupancies. Within the strip sensor developments of CMS a comparative survey of silicon materials and technologies is being performed in order to identify the baseline material for the future tracker. Hence, a variety of materials (float-zone, magnetic Czochralski and epitaxially grown silicon with thicknesses from 50$\\mu$m to 320$\\mu$m as p- and n-type) has been processed at one company (Hamamatsu Photonics K.K.), irradiated (proton, neutron and mixed irradiations up to 1.5e15n$_{eq}$/cm$^2$ and beyond) and tested under identical conditions. The wafer layout includes a variety of devices to investigate different aspects of sensor properties like simple diodes, test-structures, small strip sensors and a strip sensor array with varying strip p...

  11. Design process of the CMS Silicon Tracker for Super-LHC

    International Nuclear Information System (INIS)

    Following an expected increase of the LHC luminosity beyond its design value of 1034 cm-2s-1 the CMS collaboration is planning for an upgrade of the experimental apparatus. In particular the silicon tracker should undergo a major rebuild to cope with the new ultimate luminosity of the upgraded collider (SLHC) which is foreseen to be a factor ten greater than the present limit. In these extreme conditions several hundred of interactions per beam crossing are expected and the large number of charged particles generated will correspondingly increase, requiring a new detector with a much higher granularity. This should be achieved keeping both the tracker power consumption and the material budget at levels which will not jeopardize the instrument operability and performance. Furthermore the radiation tolerance of the new silicon sensors should be much higher than the present one, requiring major developments on the detector technology side. Finally the new tracker should be able to provide data to contribute to the CMS first level trigger. Possible layouts of the new tracking system have to be simulated in detail to understand the behaviour of the apparatus in a very high pile-up condition and to define a new optimal design which could meet the SLHC requirements. The motivations for the upgrade together with the status of this design process and recent developments on the various R activities will be described. (author)

  12. Cern

    CERN Multimedia

    2009-01-01

    "La réparation de l'accélérateur géant de particules LHC, qui devrait redémarrer mi-novembre aprés une panne de plus d'un an, a coûté 23 millions d'euros, selon un haut responsable du Centre européen de recherche nucléaire (CERN), cité vendredi par les médias espagnols" (1 paragraph)

  13. Academic Training: Technological challenges for LHC experiments, the CMS example

    CERN Multimedia

    Françoise Benz

    2005-01-01

    2004-2005 ACADEMIC TRAINING PROGRAMME LECTURE SERIES 28 February, 1, 2, 3 & 4 March from 11.00 to 12.00 hrs - Main Auditorium, bldg. 500 Technological challenges for LHC experiments, the CMS example by P. SPHICAS/CERN-PH, G. DISSERTORI/ETH, Zürich, Ch. M. MANNELLI/CERN-PH, G. HALL/Imperial College, London. GB, P. FABBRICATORE/INFN, Genova, I Monday 28 February Design principles and performances of CMS P. Sphicas/CERN-PH Tuesday 1st March Crystal calorimetry in LHC environment G. Dissertori/ETH Zürich, CH Wednesday 2 March Silicon tracking in LHC environment M. Mannelli/CERN-PH Thursday 3 March Radhard fast electronics for LHC experiments G. Hall/Imperial College London, GB Friday 4 March Design principles of thin high field superconducting solenoids P. Fabbricatore/INFN Genova, I ENSEIGNEMENT ACADEMIQUE ACADEMIC TRAINING Françoise Benz 73127 academic.training@cern.ch

  14. 20 December 2013 - R. M. Cordeiro Dunlop Ambassador Permanent Representative of Brazil to the United Nations Office and other international organisations in Geneva visiting the LHC tunnel at Point 5 with CMS Collaboration, CERN Team Leader A. Petrilli and signing the Guest Book with CERN Director-General. Accompanied by J. Salicio and R. Voss throughout.

    CERN Multimedia

    Jean-Claude Gadmer

    2013-01-01

    20 December 2013 - R. M. Cordeiro Dunlop Ambassador Permanent Representative of Brazil to the United Nations Office and other international organisations in Geneva visiting the LHC tunnel at Point 5 with CMS Collaboration, CERN Team Leader A. Petrilli and signing the Guest Book with CERN Director-General. Accompanied by J. Salicio and R. Voss throughout.

  15. CMS MANAGEMENT MEETINGS

    CERN Multimedia

    The Agendas and Minutes of the Management Board meetings are accessible to CMS members at: http://indico.cern.ch/categoryDisplay.py?categId=223 The Agendas and Minutes of the Collaboration Board meetings are accessible to CMS members at: http://indico.cern.ch/categoryDisplay.py?categId=174

  16. CMS MANAGEMENT MEETINGS

    CERN Multimedia

    MANAGEMENT BOARD MINUTES   The Agendas and Minutes of the Management Board meetings are accessible to CMS members through Indico. http://indico.cern.ch/categoryDisplay.py?categId=223 COLLABORATION BOARD MINUTES The Agendas and Minutes of the Collaboration Board meetings are accessible to CMS members through Indico. http://indico.cern.ch/categoryDisplay.py?categId=174

  17. CMS MANAGEMENT MEETINGS

    CERN Multimedia

    2011-01-01

    The Agendas and Minutes of the Management Board meetings are accessible to CMS members at: http://indico.cern.ch/categoryDisplay.py?categId=223 The Agendas and Minutes of the Collaboration Board meetings are accessible to CMS members at: http://indico.cern.ch/categoryDisplay.py?categId=174

  18. CMS MANAGEMENT MEETINGS

    CERN Multimedia

    2010-01-01

    The Agendas and Minutes of the Management Board meetings are accessible to CMS members at: http://indico.cern.ch/categoryDisplay.py?categId=223 The Agendas and Minutes of the Collaboration Board meetings are accessible to CMS members at: http://indico.cern.ch/categoryDisplay.py?categId=174

  19. CMS MANAGEMENT MEETINGS

    CERN Multimedia

    2012-01-01

      The Agendas and Minutes of the Management Board meetings are accessible to CMS members at: http://indico.cern.ch/categoryDisplay.py?categId=223 The Agendas and Minutes of the Collaboration Board meetings are accessible to CMS members at: http://indico.cern.ch/categoryDisplay.py?categId=174

  20. CMS MANAGEMENT MEETINGS

    CERN Multimedia

    The Agendas and Minutes of the Management Board meetings are accessible to CMS members at: http://indico.cern.ch/categoryDisplay.py?categId=223  The Agendas and Minutes of the Collaboration Board meetings are accessible to CMS members at: http://indico.cern.ch/categoryDisplay.py?categId=174 

  1. CMS MANAGEMENT MEETINGS

    CERN Multimedia

    2011-01-01

    The Agendas and Minutes of the Management Board meetings are accessible to CMS members at: http://indico.cern.ch/categoryDisplay.py?categId=223 The Agendas and Minutes of the Collaboration Board meetings are accessible to CMS members at: http://indico.cern.ch/categoryDisplay.py?categId=174  

  2. Validation of the Read Out Electronics for the CMS Muon Drift Chambers at Tests Beam in CERN/GIF; Validacion en el Test Beam del CERN/GIF de la electronica de Lectura de las Camaras de Muones del Experimento CMS

    Energy Technology Data Exchange (ETDEWEB)

    Fernandez, C.; Fouz, M. c.; Marin, J.; Oller, J. C.; Willmott, C.; Amigo, L. J.

    2002-07-01

    Part of the readout system for the CMS muon drift chambers has been tested in test beams at CERN/GIF. Read Out Board (ROB) and HPTD have been validated with signals from a real muon beam, with an structure and flux similar to LHC operating conditions and using one of the chambers produced in CIEMAT already located in the test beam area under normal gas and voltage conditions. (Author) 5 refs.

  3. Characterization of thin irradiated epitaxial silicon sensors for the CMS phase II pixel 2 upgrade

    International Nuclear Information System (INIS)

    The high-luminosity upgrade of the Large Hadron Collider foreseen around 2023 resulted in the decision to replace the entire tracking system of the CMS experiment. The new pixel detector will be exposed to severe radiation corresponding to 1 MeV neutron equivalent fluence up to φeq ∼ 1016 cm-2 and ionizing dose of ∼ 5 MGy after 3000 fb-1. Thin planar silicon sensors are good candidates to build the pixel detector since the degradation of the signal is less severe than for thicker devices. A study has been carried out in order to characterize highly irradiated planar epitaxial silicon sensors with an active thickness of 100 μm, in addition other silicon materials with a thickness of 200 μm have been studied. The investigation includes pad diodes and strip detectors irradiated up to a fluence of φeq = 1.3 x 1016 cm-2. The diodes have been characterized using laboratory measurements, while measurements have been carried out at the DESY II test beam facility to characterize the charge collection of the strip detectors. In this talk, the results obtained for p-bulk sensors are shown.

  4. A new algorithm for buckling analyses under non-proportional loading - with application to CERN CMS experiment

    International Nuclear Information System (INIS)

    novel algorithm is developed to determine the worst values of the parameter loads and the corresponding stability limit using a standard eigenvalue solver in an iteration scheme with fast, monotone convergence. The method was successfully applied to the buckling analyses of a lightweight structure (an assembly of thin aluminum plates and shells supporting a maximum load of about 8 kN) within CMS (a high-performance, general-purpose particle detector to be commissioned in 2005 at CERN). For four different load case combinations, each consisting of one variable load interacting with one parameter load six individual analyses were sufficient to determine the worst load case combination and the corresponding buckling load factor with a sufficiently high accuracy (error band smaller than 8 %), demonstrating the applicability and efficiency of the new algorithm. Refs. 2 (author)

  5. Silicon Sensor Prototypes for the Phase II Upgrade of the CMS Tracker

    CERN Document Server

    Bergauer, Thomas

    2015-01-01

    The CMS Tracker will be completely exchanged in the so called Phase-II upgrade. To preserve and enhance its performance in the High-Luminosity LHC phase, the new tracker will need to cope with very high radiation levels, track densities and pile-ups. In addition, it needs to provide input for the level-1 trigger. In this paper we present the baseline design of the new tracker, with a special emphasis on the two detector module concepts for the outer tracker, the 2S and PS module. The CMS Tracker collaboration designed and procured sensor prototypes from several vendors. These productions are intended for evaluating the production quality of the manufacturers, for providing functional sensors for module prototypes and for concluding the survey towards a suitable silicon base material and sensor design. Here we provide first results of the PS-p macro-pixel-light sensor and of full-scale strip sensor prototypes for the 2S module concept, both on 6- and 8-inch wafers.

  6. Pre- and post-irradiation performance of FBK 3D silicon pixel detectors for CMS

    Energy Technology Data Exchange (ETDEWEB)

    Krzywda, A., E-mail: akrzywda@purdue.edu [Purdue University, Department of Physics and Astronomy, West Lafayette, IN 47907-2036 (United States); Alagoz, E.; Bubna, M. [Purdue University, Department of Physics and Astronomy, West Lafayette, IN 47907-2036 (United States); Obertino, M. [Università del Piemonte Orientale, Novara (Italy); INFN, Sezione di Torino, Torino (Italy); Solano, A. [Università di Torino, Torino (Italy); INFN, Sezione di Torino, Torino (Italy); Arndt, K. [Purdue University, Department of Physics and Astronomy, West Lafayette, IN 47907-2036 (United States); Uplegger, L. [Fermi National Accelerator Laboratory, Batavia, IL 60510-5011 (United States); Betta, G.F. Dalla [TIFPA INFN and Dipartimento di Ingegneria Industriale, Università di Trento, Via Sommarive 9, I-38123 Povo di Trento, TN (Italy); Boscardin, M. [Centro per Materiali e i Microsistemi Fondazione Bruno Kessler (FBK), Trento, Via Sommarive 18, I-38123 Povo di Trento, TN (Italy); Ngadiuba, J. [Università di Milano-Bicocca, Milan (Italy); Rivera, R. [Fermi National Accelerator Laboratory, Batavia, IL 60510-5011 (United States); Menasce, D.; Moroni, L.; Terzo, S. [Università di Milano-Bicocca, Milan (Italy); Bortoletto, D. [Purdue University, Department of Physics and Astronomy, West Lafayette, IN 47907-2036 (United States); Prosser, A.; Adreson, J.; Kwan, S. [Fermi National Accelerator Laboratory, Batavia, IL 60510-5011 (United States); Osipenkov, I. [Texas A and M University, Department of Physics, College Station, TX 77843 (United States); Bolla, G. [Purdue University, Department of Physics and Astronomy, West Lafayette, IN 47907-2036 (United States); and others

    2014-11-01

    In preparation for the tenfold luminosity upgrade of the Large Hadron Collider (the HL-LHC) around 2020, three-dimensional (3D) silicon pixel sensors are being developed as a radiation-hard candidate to replace the planar ones currently being used in the CMS pixel detector. This study examines an early batch of FBK sensors (named ATLAS08) of three 3D pixel geometries: 1E, 2E, and 4E, which respectively contain one, two, and four readout electrodes for each pixel, passing completely through the bulk. We present electrical characteristics and beam test performance results for each detector before and after irradiation. The maximum fluence applied is 3.5×10{sup 15} n {sub eq}/cm{sup 2}.

  7. Electrical characterization of a radiation-hardened silicon pixel design for CMS

    CERN Document Server

    Xie, X B; Liang, G W; Huang, W; Li, Z; Chien, C Y

    2002-01-01

    We have summarized our R and D on the radiation hardening and handling of high operating voltage for the CMS forward pixel detectors. More radiation-hardened silicon pixel sensors of configuration n sup + /n/p sup + with single-sided multi-guard ring structures have been developed and tested under the radiation environment expected at LHC. In the design, no guard ring is required on the n sup + side and guard rings on the p sup + side are always kept active before and after type inversion. The whole n sup + side is grounded and connected to readout-chip, which greatly simplifies detectors assembling and improves the stability of bump-bonded readout chip on the n sup + side. Samples had been irradiated to high fluence neutron and proton radiations to study the radiation hardness effects. Electrical characteristics such as leakage current, potential distributions over guard rings and full depletion voltage were measured under different temperatures.

  8. Electrical characterization of a radiation-hardened silicon pixel design for CMS

    Science.gov (United States)

    Xie, X. B.; Cho, H. S.; Liang, G. W.; Huang, W.; Li, Z.; Chien, C. Y.

    2002-01-01

    We have summarized our R&D on the radiation hardening and handling of high operating voltage for the CMS forward pixel detectors. More radiation-hardened silicon pixel sensors of configuration n +/n/p + with single-sided multi-guard ring structures have been developed and tested under the radiation environment expected at LHC. In the design, no guard ring is required on the n + side and guard rings on the p + side are always kept active before and after type inversion. The whole n + side is grounded and connected to readout-chip, which greatly simplifies detectors assembling and improves the stability of bump-bonded readout chip on the n + side. Samples had been irradiated to high fluence neutron and proton radiations to study the radiation hardness effects. Electrical characteristics such as leakage current, potential distributions over guard rings and full depletion voltage were measured under different temperatures.

  9. International Masterclass at CMS

    CERN Document Server

    Lapka, M

    2012-01-01

    The CMS collaboration welcomed a class of French high school students to the CERN facility in Meyrin, Switzerland on the 12 of March, 2012. Students spent the day meeting with physicists, hearing talks, asking questions, and participating in a hands-on exercise using real data collected by the CMS experiment on the Large Hadron Colider. Talks and other resources are available here: http://ippog-dev.web.cern.ch/resources/2012/ippog-international-masterclass-2012-cms

  10. Performance of CMS silicon microstrip detectors with the APV6 readout chip

    International Nuclear Information System (INIS)

    We present results obtained with full-size wedge silicon microstrip detectors bonded to APV6 (Raymond et al., Proceedings of the 3rd Workshop on Electronics for LHC Experiments, CERN/LHCC/97-60) readout chips. We used two identical modules, each consisting of two crystals bonded together. One module was irradiated with 1.7x1014 neutrons/cm2. The detectors have been characterized both in the laboratory and by exposing them to a beam of minimum ionizing particles. The results obtained are a good starting point for the evaluation of the performance of the 'ensemble' detector plus readout chip in a version very similar to the final production one. We detected the signal from minimum ionizing particles with a signal-to-noise ratio ranging from 9.3 for the irradiated detector up to 20.5 for the non-irradiated detector, provided the parameters of the readout chips are carefully tuned

  11. 19th July 2010 - Italian Senators and Deputies on the occasion of the Third World Conference of Speakers of Parliament, visiting CMS control room with CERN Director-General R. Heuer.

    CERN Multimedia

    Jean-Claude Gadmer

    2010-01-01

    CERN-HI-1007208 01: In the CMS surafce building 3578, from left to right: ALICE Collaboration Spokesperson elect P. Giubellino, Guest Professor and Former Italian Senator G. Basini, Technology Deputy Department Head L. Rossi, Vice President House R. Buttiglione, Vice President of the Italian Senate V. Chiti,Engineering Department Head R. Saban, Permanent Representative of Italy to the UN Ambassador L. Mirachian, CMS Collaboration Spokesperson G. Tonelli, Director for Research and Computing S. Bertolucci.

  12. Construction and calibration of the laser alignment system for the CMS tracker

    OpenAIRE

    Adolphi, Roman

    2006-01-01

    The CMS detector (Compact Muon Solenoid) is under construction at one of the four proton-proton interaction points of the LHC (Large Hadron Collider) at CERN, the European Organization for Nuclear Research (Geneva, Switzerland). The inner tracking system of the CMS experiment consisting of silicon detectors will have a diameter of 2.4 meter and a length of 5.4 meter representing the largest silicon tracker ever. About 15000 silicon strip modules create an active silicon area of 200 square met...

  13. Development and evaluation of test stations for the quality assurance of the silicon micro-strip detector modules for the CMS experiment

    Energy Technology Data Exchange (ETDEWEB)

    Poettgens, M.

    2007-11-22

    CMS (Compact Muon Solenoid) is one of four large-scale detectors which will be operated at the LHC (Large Hadron Collider) at the European Laboratory for Particle Physics (CERN). For the search for new physics the reconstruction of the collision products and their properties is essential. In the innermost part of the CMS detector the traces of ionizing particles are measured utilizing a silicon tracker. A large fraction of this detector is equipped with silicon micro-strip modules which provide a precise space resolution in 1-dimension. A module consists of a sensor for detection of particles, the corresponding read-out electronics (hybrid) and a mechanical support structure. Since the 15,148 modules, which will be installed in the silicon micro-strip detector, have a total sensitive surface area of about 198 m{sup 2}, the inner tracker of CMS is the largest silicon tracking detector, which has ever been built. While the sensors and hybrids are produced in industry, the construction of the modules and the control of the quality is done by the members of the 21 participating institutes. Since the access to the silicon micro-strip tracker will be very limited after the installation in the CMS detector the installed modules must be of high quality. For this reason the modules are thoroughly tested and the test results are uploaded to a central database. By the development of a read-out system and the corresponding software the III. Physikalisches Institut made an important contribution for the electrical and functional quality control of hybrids and modules. The read-out system provides all features for the operation and test of hybrids and modules and stands out due to high reliability and simple handling. Because a very user-friedly and highly automated software it became the official test tool and was integrated in various test stands. The test stands, in which the read-out system is integrated in, are described and the tests which are implemented in the

  14. Validation of Kalman Filter alignment algorithm with cosmic-ray data using a CMS silicon strip tracker endcap

    Energy Technology Data Exchange (ETDEWEB)

    Sprenger, D; Weber, M; Adolphi, R; Brauer, R; Feld, L; Klein, K; Ostapchuk, A; Schael, S; Wittmer, B, E-mail: daniel.sprenger@cern.c [RWTH Aachen University, I. Physikalisches Institut, Aachen (Germany)

    2010-06-15

    A Kalman Filter alignment algorithm has been applied to cosmic-ray data. We discuss the alignment algorithm and an experiment-independent implementation including outlier rejection and treatment of weakly determined parameters. Using this implementation, the algorithm has been applied to data recorded with one CMS silicon tracker endcap. Results are compared to both photogrammetry measurements and data obtained from a dedicated hardware alignment system, and good agreement is observed.

  15. Validation of Kalman Filter alignment algorithm with cosmic-ray data using a CMS silicon strip tracker endcap

    CERN Document Server

    Sprenger, D; Adolphi, R; Brauer, R; Feld, L; Klein, K; Ostaptchuk, A; Schael, S; Wittmer, B

    2010-01-01

    A Kalman Filter alignment algorithm has been applied to cosmic-ray data. We discuss the alignment algorithm and an experiment-independent implementation including outlier rejection and treatment of weakly determined parameters. Using this implementation, the algorithm has been applied to data recorded with one CMS silicon tracker endcap. Results are compared to both photogrammetry measurements and data obtained from a dedicated hardware alignment system, and good agreement is observed.

  16. Radiation hardness and precision timing study of Silicon detectors for the CMS High Granularity Calorimeter (HGC)

    CERN Document Server

    E. Curras; C. Gallrapp; L. Gray; M. Mannelli; P. Meridiani; M. Moll; S. Nourbakhsh; C. Scharf; P. Silva; G. Steinbrueck; T. Tabarelli de Fatis; I. Vila

    2016-01-01

    The high luminosity upgraded LHC or Phase-II is expected to increase the instantaneous luminosity by a factor of 10 beyond the LHC's design value, expecting to deliver 250 fb^−1 per year for a further 10 years of operation. Under these conditions the performance degradation due to integrated radiation dose will need to be addressed. The CMS collaboration is planning to upgrade the forward calorimeters. The replacement is called the High Granularity Calorimeter (HGC) and it will be realized as a sampling calorimeter with layers of silicon detectors interleaved. The sensors will be realized as pad detectors with sizes of less that ∼1.0 cm^2 and an active thickness between 100 and 300 μm depending on the position, respectively, the expected radiation levels. For an integrated luminosity of 3000 fb^−1, the electromagnetic calorimetry will sustain integrated doses of 1.5 MGy (150 Mrads) and neutron fluences up to 10^16 neq/cm^2. A radiation tolerance study after neutron irradiation of 300, 200, and 100 μ...

  17. The Implementation of the power supply system of the CMS Silicon Strip Tracker

    CERN Document Server

    Paoletti, S

    2007-01-01

    The power supply system of the silicon strip tracker of the CMS experiment provides HV bias and LV power to the 15000 modules of the detector, arranged into 1944 “power groups” and 256 “control rings”. Around 1200 power supply modules, disposed on 29 racks, operate in a “hostile” radiation and magnetic field environment, 10 m away from the beam crossing region. They power the detector through≃ 50 m long custom-designed “Low Impedance” cables, adopting the sensing wire technique to compensate voltage drops. Detector “power groups” and “control groups” are powered bymodules of different architecture,which are fed by 48 V sources, provided by AC-DC converters installed in the racks. This paper reports the experience acquired in the implementation of the system, the rack layout, the grounding scheme, the power budget, the heat dissipation on racks. A comprehensive Quality Assurance program ensured the performance, using a well defined protocol, shared with the board’s manufacturer, for...

  18. Performance of CMS 3D silicon pixel detectors before and after irradiation

    Energy Technology Data Exchange (ETDEWEB)

    Obertino, M., E-mail: margherita.obertino@cern.ch [Università del Piemonte Orientale, Novara, and INFN, Torino (Italy); Solano, A. [Università di Torino and INFN, Torino (Italy); Alagoz, E. [Physics Department, Purdue University, West Lafayette, IN (United States); Andresen, J. [University of Colorado, Boulder (United States); Arndt, K.; Bolla, G.; Bortoletto, D. [Physics Department, Purdue University, West Lafayette, IN (United States); Boscardin, M. [Centro per i Materiali e i Microsistemi Fondazione Bruno Kessler (FBK), Povo di Trento (Italy); Brosius, R. [SUNY, Buffalo (United States); Bubna, M. [Physics Department, Purdue University, West Lafayette, IN (United States); Dalla Betta, G.-F. [INFN Padova (Gruppo Collegato di Trento) and Università di Trento, Povo di Trento (Italy); Jensen, F. [University of Colorado, Boulder (United States); Krzywda, A. [Physics Department, Purdue University, West Lafayette, IN (United States); Kumar, A. [SUNY, Buffalo (United States); Kwan, S. [Fermi National Accelerator Laboratory, Batavia, IL (United States); Lei, C.M. [University of Colorado, Boulder (United States); Menasce, D.; Moroni, L. [INFN Milano Bicocca, Milano (Italy); Ngadiuba, J. [Università di Milano Bicocca and INFN, Milano (Italy); Osipenkov, I. [Texas A and M University, TX (United States); and others

    2013-12-01

    Three-dimensional (3D) silicon detectors are emerging as one of the most promising technologies for the innermost layers of tracking devices for the foreseen upgrades of the LHC. 3D sensors compatible with the CMS readout, fabricated at FBK (Trento, Italy), were tested in the laboratory and with a 120 GeV/c proton beam at the FNAL test beam facility, before and after irradiation up to a fluence of 3.5×10{sup 15}neq/cm{sup 2}. Preliminary results of the data analysis are presented. -- Highlights: •3D characterized in laboratory, tested with beam and irradiated with 800 MeV protons. •Leakage current: few hundred nA before irradiation, ∼10 μA after irradiation. •Depletion voltage: 20 V. Breakdown voltage: 25–35 V, not increasing after irradiation. •Efficiency: 97.5%, increasing when tilting sensors with respect to the beam. •Radiation effect: lower efficiency and lower collected charge.

  19. Transport of the first half of the CMS hadronic forward calorimeter (HF) from building 186 (CERN Meyrin site) to the CMS construction hall at point 5, Cessy, France.

    CERN Multimedia

    Florelle Antoine

    2006-01-01

    The two halves of the Forward Hadronic Calorimeter (HF) were transported from the CERN Meyrin site to the surface assembly hall at LHC Point 5 in Cessy, France, during the first part of July. Transporting these 300 tonne objects involved the construction around them of a 65-metre long trailer, simultaneously pushed and pulled by two trucks at either end. The main road between St. Genis and Cessy was closed during these operations and a police escort was provided for the ~5 hour journeys. The two HF halves will be the first major elements to be lowered by the gantry crane into the underground experimental cavern around the end of July or beginning of August.

  20. A novel powering scheme based on DC-DC conversion for the luminosity upgrades of the CMS tracking system at CERN

    International Nuclear Information System (INIS)

    The instantaneous luminosity of the LHC is expected to reach 2 x 1034 s-1cm-2 and 5 x 1034 s-1cm-2 around the years 2019 and 2024, respectively. After the second upgrade the LHC will be referred to as the High Luminosity LHC (HL-LHC). In order to benefit from the higher luminosities, CMS foresees to upgrade its pixel detector during an extended winter shutdown of the LHC at the end of 2016 and the beginning of 2017. During a long shutdown of the LHC over the years 2022 and 2023, it is foreseen to install a completely new tracking system in CMS. Both upgrades are expected to result in the need to provide more electric current to the detector. However, power losses in cables already contribute 50% to the power consumption of the present tracker and rise with the current squared. Since no more space is available for cables, and thicker cables within the tracking volume spoil the material budget of the detector, new powering schemes are considered mandatory. CMS foresees the use of radiation tolerant DC-DC converters on the front-end to reduce power losses on cables. This thesis describes the new powering scheme of the CMS pixel detector and discusses the options with respect to a new strip tracker. A radiation and magnetic field tolerant DC-DC converter prototype, the PIXV8A, is introduced and the research that led to its development is summarised. The PIXV8A has been developed for the application in the pixel upgrade and is also a first approach for a DC-DC converter for the later upgrade of the CMS tracking system. The PIXV8A makes use of the AMIS4 chip, which has been proven to stay operational for total ionising doses of up to 1 MGy and fluences of up to 1015 neq/cm2. With an input voltage of 10 V, the PIXV8A converter provides an efficiency of about 80% for output voltages of 2.5 V and 3.0 V. Within this thesis the robustness of the novel powering scheme and the qualification of the PIXV8A are demonstrated in several tests, including system test measurements with

  1. Irradiation study of different silicon materials for the CMS tracker upgrade

    International Nuclear Information System (INIS)

    Around 2022, an upgrade of the LHC collider complex is planned to significantly increase the luminosity (the High Luminosity LHC, HL-LHC). This means that the experiments have to cope with a higher number of collisions per bunch crossing and survive in a radiation environment much harsher than that at the present LHC. Especially the tracking detectors have to be improved for the HL-LHC. The increased number of tracks requires an increase of the number of readout channels while the higher radiation makes new sensor materials necessary. Within CMS, a measurement campaign was initiated to study the performance of different silicon materials in a corresponding radiation environment. To simulate the expected radiation the samples were irradiated with neutrons and with protons with two different energies. Radiation damage can be divided in two categories. First, ionizing energy loss in the surface isolation layers of the sensor leads to a change of the concentration of charged states in the sensor surface and therefore alters the distribution of the electrical fields in the sensor. Second, non-ionizing energy loss in the bulk of the sensor material leads to a variety of defects in the silicon lattice. Electrically active defects can influence the material properties. The three properties under investigation are the reverse current, the full depletion voltage and the charge collection. While the reverse current and full depletion voltage influence the power dissipation and the noise of the detector, the charge collection directly influences the measurement. The material properties were studied using pad and strip sensor. The structures were electrically characterized before and after irradiation with different fluences of neutrons and protons, corresponding to the expected fluences at different radii of the outer tracker after 3000 fb-1. The charge collection measurements were mainly performed using the ALiBaVa readout system and the charge was induced with β-sources and

  2. Contribution to the gamma calibration by the radiative decay Z → μμγ, in the CMS experiment at LHC (CERN)

    International Nuclear Information System (INIS)

    The LHC has started to take data since november 2009. This opened a new era of discovery in particle physics. The CMS detector is one of the main experiment at the LHC (CERN). One goal of this experiment is the Higgs's boson discovery, that can be related to the electroweak symmetry breaking. After a contextual position of the LHC and CMS within the nowadays' particle physics, I will explain the whole chain allowing to go from the physical event to the final analysis, in order to extract the reconstructed particles and the information allowing us, at the end, to discover new particles like the Higgs's boson. The first part of this work was about the measurement and the study of the acquisition electronics gains-ratios. This work aimed at having a precise measurement of the photons energy on the whole available energy band (35 MeV -> 1.7 TeV). In particular, this work deals with the validation of the different calibration methods for the VFE acquisition cards within the detector. A second part of my work was about the way that we have to generate the physics events avoiding double-counting between photons coming from matrix-element generators and those coming from parton-shower algorithms. An anti-double-counting veto has been created. Finally the last part of the work was about the way the radiative decay of the Z0 neutral electroweak gauge boson allow, by the selection of certified photons, the extraction of the photons energy scale inside the electromagnetic calorimeter of CMS. (author)

  3. The design and construction of a double-sided Silicon Microvertex Detector for the L3 experiment at CERN

    International Nuclear Information System (INIS)

    A Silicon Microvertex Detector (SMD) has been commissioned for the L3 experiment at the Large Electron-Positron colliding-beam accelerator (LEP) at the European Center for Nuclear Physics, (CERN). The SMD is a 72,672 channel, two layer barrel tracker that is comprised of 96 ac-coupled, double-sided silicon detectors. Details of the design and construction are presented

  4. 30th August 2010 - Permanent Representative of the People's Republic of China to the United Nations Office at Geneva, Ambassador Y. He visiting the CMS underground experimental area and LHC tunnel with CERN Director-General R. Heuer and Collaboration Spokesperson G. Tonelli.

    CERN Multimedia

    Maximilien Brice

    2010-01-01

    CERN-HI-1008197 01: in the LHC tunnel at Point 5: CMS Collaboaration Spokesperson G. Tonelli, Mrs L. Jianping (Ambassador's spouse), Mrs B. Heuer, Permanent Representative of the People's Republic of China to the United Nations Office at Geneva, Ambassador Y. He, CERN Director-General R. Heuer and Adviser R. Voss; CERN-HI-1008197 57: in front of the CMS experiment at LHC point 5: CMS technical Coordinator A. Ball, Mrs L. Jianping (Ambassador's spouse), Permanent Representative of the People's Republic of China to the United Nations Office at Geneva, Ambassador Y. He; Mrs B. Heuer, CERN Director-General R. Heuer, CMS Collaboaration Spokesperson G. Tonelli and Adviser R. Voss. CERN-HI-1008197 02 - 14: Welcome in front of building 3562 at CMS. Head of International relations F: Pauss gives the introduction talk to the delegation. CERN-HI-1008197 15 - 25: visiting CMS control room at Point 5 with Collaboration Spokesperson G. Tonelli; CERN-HI-1008197 26 - 29: visiting the service cavern in the CMS underground ar...

  5. Calibration, alignment and long-term performance of the CMS silicon tracking detector

    Energy Technology Data Exchange (ETDEWEB)

    Butz, E.

    2009-03-15

    With an active area of more than 200 m{sup 2}, the CMS silicon strip detector is the largest silicon tracker ever built. It consists of more than 15,000 individual silicon modules which have to meet very high standards in terms of noise behavior and electronic crosstalk, as well as their exact positioning within the tracker. Furthermore, the modules will be exposed to a harsh radiation environment over the lifetime of the tracker. This thesis deals with several of the above-mentioned aspects. In the first part, individual modules are investigated using a testbeam. Some of the modules were irradiated up to an integrated dose which corresponds to the expected one over the life time of the tracker. These modules are investigated with respect to their signal-to-noise behavior, and their cross-talk. Several operational parameters are varied, such as the temperature and the bias voltage. It is shown that the modules behave as expected. The signal-to-noise ratio is well above the specifications and the cross-talk increases only very moderately with irradiation. Furthermore, the spatial resolution of the modules is investigated. Different cluster algorithms are utilized and compared. It is shown that the spatial resolution is not much affected by irradiation and that the spatial resolution can be improved with respect to the current standard reconstruction. In the second part, larger structures of the silicon tracker are studied during the socalled 'tracker slice-test'. Two sectors from one of the tracker end caps are investigated. Special emphasis is given to the commissioning of the system and the monitoring of the various commissioning parameters. Furthermore, the noise of the system is investigated as a function of the ambient temperature and different powering schemes. It is shown that the noise of the system behaves as expected. The noise is stable within 2% for different powering schemes. Also possible failures of components are investigated and persistent

  6. Calibration, alignment and long-term performance of the CMS silicon tracking detector

    International Nuclear Information System (INIS)

    With an active area of more than 200 m2, the CMS silicon strip detector is the largest silicon tracker ever built. It consists of more than 15,000 individual silicon modules which have to meet very high standards in terms of noise behavior and electronic crosstalk, as well as their exact positioning within the tracker. Furthermore, the modules will be exposed to a harsh radiation environment over the lifetime of the tracker. This thesis deals with several of the above-mentioned aspects. In the first part, individual modules are investigated using a testbeam. Some of the modules were irradiated up to an integrated dose which corresponds to the expected one over the life time of the tracker. These modules are investigated with respect to their signal-to-noise behavior, and their cross-talk. Several operational parameters are varied, such as the temperature and the bias voltage. It is shown that the modules behave as expected. The signal-to-noise ratio is well above the specifications and the cross-talk increases only very moderately with irradiation. Furthermore, the spatial resolution of the modules is investigated. Different cluster algorithms are utilized and compared. It is shown that the spatial resolution is not much affected by irradiation and that the spatial resolution can be improved with respect to the current standard reconstruction. In the second part, larger structures of the silicon tracker are studied during the socalled ''tracker slice-test''. Two sectors from one of the tracker end caps are investigated. Special emphasis is given to the commissioning of the system and the monitoring of the various commissioning parameters. Furthermore, the noise of the system is investigated as a function of the ambient temperature and different powering schemes. It is shown that the noise of the system behaves as expected. The noise is stable within 2% for different powering schemes. Also possible failures of components are investigated and persistent defects are

  7. Investigating the Inverse Square Law with the Timepix Hybrid Silicon Pixel Detector: A CERN [at] School Demonstration Experiment

    Science.gov (United States)

    Whyntie, T.; Parker, B.

    2013-01-01

    The Timepix hybrid silicon pixel detector has been used to investigate the inverse square law of radiation from a point source as a demonstration of the CERN [at] school detector kit capabilities. The experiment described uses a Timepix detector to detect the gamma rays emitted by an [superscript 241]Am radioactive source at a number of different…

  8. Development of Radiation Hard Radiation Detectors, Differences between Czochralski Silicon and Float Zone Silicon

    CERN Document Server

    Tuominen, Eija

    2012-01-01

    The purpose of this work was to develop radiation hard silicon detectors. Radiation detectors made ofsilicon are cost effective and have excellent position resolution. Therefore, they are widely used fortrack finding and particle analysis in large high-energy physics experiments. Silicon detectors willalso be used in the CMS (Compact Muon Solenoid) experiment that is being built at the LHC (LargeHadron Collider) accelerator at CERN (European Organisation for Nuclear Research). This work wasdone in the CMS programme of Helsinki Institute of Physics (HIP).Exposure of the silicon material to particle radiation causes irreversible defects that deteriorate theperformance of the silicon detectors. In HIP CMS Programme, our approach was to improve theradiation hardness of the silicon material with increased oxygen concentration in silicon material. Westudied two different methods: diffusion oxygenation of Float Zone silicon and use of high resistivityCzochralski silicon.We processed, characterised, tested in a parti...

  9. CMS MANANGEMENT MEETINGS

    CERN Multimedia

    Management Board Agendas and minutes of meetings of the Management Board are accessible to CMS members at: http://indico.cern.ch/categoryDisplay.py?categId=223 Collaboration Board Agendas and minutes of meetings of the Collaboration Board are accessible to CMS members at: http://indico.cern.ch/categoryDisplay.py?categId=174 LHCC: Feedback from the CMS Referees, LHCC 97 February 25, 2009. The CMS LHCC referees met with representatives of CMS on 17-2-09, to review progress since the last November minireview. The main topics included shutdown construction, maintenance and repairs; status of the preshower detector; commissioning and physics analysis results from cosmic ray running and CSA08; preparations for physics, off line analysis, computing, and data distribution. TOTEM management and the TOTEM referees then joined us for a joint session to examine the readiness of the TOTEM detector. Detector construction, maintenance, and repairs. The referees congratulate CMS Management and the Detector Groups for the...

  10. CMS Virtual Tour Greece

    CERN Document Server

    CERN. Geneva

    2014-01-01

    More than 500 high-school students from 7 locations in Greece visit virtually the CMS experiment. Read more about this record-breaking event here: http://home.web.cern.ch/students-educators/updates/2014/02/students-visit-heart-cms-detector

  11. The Status of CMS

    OpenAIRE

    Incandela, Joseph R.

    2007-01-01

    After a brief overview of the Compact Muon Solenoid (CMS) experiment, the status of construction, installation and commissioning is described. Very good progress has been achieved in the past year. Though many significant challenges still lie ahead, CMS should be ready for recording data from first collisions in the Large Hadron Collider (LHC) accelerator complex at CERN

  12. Auger Physicists visit CMS

    CERN Multimedia

    Hoch, Michael

    2012-01-01

    Visit at CERN P5 CMS in the experimental cavern Alan Watson, Auger Spokesperson Emeritus, University of Leeds; Jim Cronin, Nobel Laureate, Auger Spokesperson Emeritus, University of Chicago; Jim Virdee, CMS Former Spokesperson, Imperial College; Jim Matthews, Auger Co-Spokesperson, Louisiana State University

  13. CERN Holiday Gift Guide

    CERN Multimedia

    2013-01-01

    Do you have last-minute gifts to get? Stuck for ideas? The CERN Shop and the ATLAS and CMS secretariats have some wonderfully unique gifts and stocking-fillers for sale this year - perfect for the physics fanatics in your life. Let's take a look...   1. CERN Notebook, 10 CHF - 2. CERN Pop-up book, 30 CHF - 3. USB Stick 8GB, 25 CHF - 4. CERN Tumbler, 12 CHF 5. ATLAS 3D Viewer, 5 CHF - 6. ATLAS Puzzle, 15 CHF - 7. CMS Umbrella, 25 CHF   These gifts are all available at the CERN Shop, with the exception of the ATLAS 3D Viewer and the CMS umbrella, which are only available from the respective secretariats. Don’t forget! If you’re from CERN, you still have time to take advantage of a 10% off discount at the CERN shop. Offer ends 20 December.

  14. CERN-RD39 collaboration activities aimed at cryogenic silicon detector application in high-luminosity Large Hadron Collider

    Science.gov (United States)

    Li, Zheng; Eremin, Vladimir; Verbitskaya, Elena; Dehning, Bernd; Sapinski, Mariusz; Bartosik, Marcin R.; Alexopoulos, Andreas; Kurfürst, Christoph; Härkönen, Jaakko

    2016-07-01

    Beam Loss Monitors (BLM) made of silicon are new devices for monitoring of radiation environment in the vicinity of superconductive magnets of the Large Hadron Collider. The challenge of BLMs is extreme radiation hardness, up to 1016 protons/cm2 while placed in superfluid helium (temperature of 1.9 K). CERN BE-BI-BL group, together with CERN-RD39 collaboration, has developed prototypes of BLMs and investigated their device physics. An overview of this development-results of the in situ radiation tests of planar silicon detectors at 1.9 K, performed in 2012 and 2014-is presented. Our main finding is that silicon detectors survive under irradiation to 1×1016 p/cm2 at 1.9 K. In order to improve charge collection, current injection into the detector sensitive region (Current Injection Detector (CID)) was tested. The results indicate that the detector signal increases while operated in CID mode.

  15. CERN videonews magazine Nr 2 : December 2002

    CERN Multimedia

    Audiovideo Service

    2002-01-01

    News from :ATRAP experiment's latest achievements. (CERN Bulletin 45/2002) CAST experiment. (CERN Bulletin 35/2002) InDiCo : the European digital conferencing project. (CERN Bulletin 42/2002) CMS : superconducting cable production Diaporama

  16. 3 October 2013 - Ukrainian Vice Prime Minister Ukraine K. I. Gryschenko welcomed by CERN Director-General R. Heuer who introduces Head of International Relations R. Voss; Head of Technology Department F. Bordry; Deputy Head of International Relations E. Tsesmelis; Deputy Legal Counsel M. Wilbers; Adviser for Ukraine T. Kurtyka; Signing of the Agreement between Ukraine and CERN concerning the granting of the status of Associate Member at CERN; in the LHC tunnel at Point 5 and visiting CMS experimental area with CERN Team Leader A. Petrilli.

    CERN Multimedia

    Anna Pantelia

    2013-01-01

    3 October 2013 - Ukrainian Vice Prime Minister Ukraine K. I. Gryschenko welcomed by CERN Director-General R. Heuer who introduces Head of International Relations R. Voss; Head of Technology Department F. Bordry; Deputy Head of International Relations E. Tsesmelis; Deputy Legal Counsel M. Wilbers; Adviser for Ukraine T. Kurtyka; Signing of the Agreement between Ukraine and CERN concerning the granting of the status of Associate Member at CERN; in the LHC tunnel at Point 5 and visiting CMS experimental area with CERN Team Leader A. Petrilli.

  17. Radiation damage in the diamond based beam condition monitors of the CMS experiment at the Large Hadron Collider (LHC) at CERN

    CERN Document Server

    Guthoff, Moritz; Dabrowski, Anne; De Boer, Wim; Stickland, David; Lange, Wolfgang; Lohmann, Wolfgang

    2013-01-01

    The Beam Condition Monitor (BCM) of the CMS detector at the LHC is a protection device similar to the LHC Beam Loss Monitor system. While the electronics used is the same, poly-crystalline Chemical Vapor Deposition (pCVD) diamonds are used instead of ionization chambers as the BCM sensor material. The main purpose of the system is the protection of the silicon Pixel and Strip tracking detectors by inducing a beam dump, if the beam losses are too high in the CMS detector. By comparing the detector current with the instantaneous luminosity, the BCM detector ef fi ciency can be monitored. The number of radiation-induced defects in the diamond, reduces the charge collection distance, and hence lowers the signal. The number of these induced defects can be simulated using the FLUKA Monte Carlo simulation. The cross-section for creating defects increases with decreasing energies of the impinging particles. This explains, why diamond sensors mounted close to heavy calorimeters experience more radiation damage, becaus...

  18. Annealing of irradiated silicon strip detectors for the ATLAS experiment at CERN

    International Nuclear Information System (INIS)

    ATLAS prototype n-in-n and p-in-n silicon strip detectors from several manufacturers were irradiated with 24 GeV protons at the CERN PS to a total fluence of 3x1014 p/cm2. This is equivalent to the maximum fluence expected in the strip detector part of the silicon tracker after 10 yr of operation. The ATLAS semiconductor tracker will be operated at -7 deg. C. Yearly warm-up periods of 2 days at 20 deg. C and 2 weeks at 17 deg. C are foreseen for maintenance purposes (ATLAS Inner Detector Technical Design Rep., 1997). To study the long-term effects of radiation damage and warm-up the detectors underwent controlled thermal annealing. The Ziock parameterisation was used to simulate the warm-up effects of 10 yr on a shortened time scale (H.J. Ziock et al., Nucl. Instr. and Meth. A 342 (1994) 96). Using this parameterisation the same amount of anti-annealing gained during 10 yr of warm-ups can be reached by storing the detectors for 21 days at 25 deg. C. During the annealing period current-voltage and capacitance-voltage measurements were carried out at regular intervals. The full depletion voltage was then determined from the capacitance measurements and showed a clear dependency on the measurement frequency and temperature. The evolution of the full depletion voltage as a function of annealing time is compared to the Ziock parameterisation

  19. Radiation hard silicon microstrip detectors for use in ATLAS at CERN

    International Nuclear Information System (INIS)

    The Large Hadron Collider (LHC) at CERN (Geneva, Switzerland) will accelerate protons in colliding beams to a center of mass energy of 14 TeV at very high luminosities. The ATLAS detector is being built to explore the physics in this unprecedented energy range. Tracking of charged particles in high-energy physics (HEP) experiments requires a high spatial resolution and fast signal readout, all with as little material as possible. Silicon microstrip detectors meet these requirements well and have been chosen for the Semiconductor Tracker (SCT) which is part of the inner tracking system of ATLAS and has a total area of 61 m2. During the 10 years of operation at LHC, the total fluence received by the detectors is sufficiently large that they will suffer a severe degradation from radiation induced damage. The damage affects both the physics performance of the detectors as well as their operability and a great challenge has been to develop radiation hard detectors for this environment. An extensive irradiation programme has been carried out where detectors of various designs, including defect engineering by oxygen enriched silicon, have been irradiated to the expected fluence. A subsequent thermal annealing period is included to account for a realistic annual maintenance schedule at room temperature, during which the radiation induced defects alter the detector properties significantly. This thesis presents work that has been carried out in the Bergen ATLAS group with results both from the irradiation programme and from detector testing during the module production. (Author)

  20. Radiation hard silicon microstrip detectors for use in ATLAS at CERN

    Energy Technology Data Exchange (ETDEWEB)

    Johansen, Lars Gimmestad

    2005-07-01

    The Large Hadron Collider (LHC) at CERN (Geneva, Switzerland) will accelerate protons in colliding beams to a center of mass energy of 14 TeV at very high luminosities. The ATLAS detector is being built to explore the physics in this unprecedented energy range. Tracking of charged particles in high-energy physics (HEP) experiments requires a high spatial resolution and fast signal readout, all with as little material as possible. Silicon microstrip detectors meet these requirements well and have been chosen for the Semiconductor Tracker (SCT) which is part of the inner tracking system of ATLAS and has a total area of 61 m2. During the 10 years of operation at LHC, the total fluence received by the detectors is sufficiently large that they will suffer a severe degradation from radiation induced damage. The damage affects both the physics performance of the detectors as well as their operability and a great challenge has been to develop radiation hard detectors for this environment. An extensive irradiation programme has been carried out where detectors of various designs, including defect engineering by oxygen enriched silicon, have been irradiated to the expected fluence. A subsequent thermal annealing period is included to account for a realistic annual maintenance schedule at room temperature, during which the radiation induced defects alter the detector properties significantly. This thesis presents work that has been carried out in the Bergen ATLAS group with results both from the irradiation programme and from detector testing during the module production. (Author)

  1. Iron Blocks of CMS Magnet Barrel Yoke.

    CERN Multimedia

    2000-01-01

    On the occasion of presenting the CMS Award 2000 to Deggendorfer Werft und Eisenbau GmbH the delivered blocks were inspected at CERN Point 5. From left to right: H. Gerwig (CERN, CMS Magnet Barrel Yoke Coordinator), G. Waurick (CERN), F. Leher (DWE, Project Engineer) and W. Schuster (DWE, Project Manager).

  2. Observation of direct photons in the preliminary data and preparation for the Higgs boson search in the CMS experiment at LHC (CERN)

    International Nuclear Information System (INIS)

    The LHC (Large Hadron Collider) provides proton-proton collisions to CERN (European Organization for Nuclear Research) experiments at a 7 TeV center of mass energy since March 2010. The LHC has been designed in particular to allow the Higgs boson searches, particle predicted in the standard model but still not discovered until today, in the whole mass range where it is expected. This work is a contribution to the Higgs boson searches in CMS (Compact Muon Solenoid), one of the four big detectors at LHC. The thesis develops several tools which allow to measure the backgrounds and to improve the discovery potential. A new tool for recovery of photons emitted by leptons in the final state: H → ZZ(*) → 4l (l=e, μ) has been developed in this thesis. This method that recovers a variable number of photons per event, performs better than the method previously used in CMS and improves Z0 and Higgs boson mass resolution. A 5% gain on the significance to observe a Higgs boson in this channel is reached. The second part of this work deals with studies of the backgrounds and the search for a light Higgs boson (110 H 0 discrimination with a neural network has been developed to reject photons coming from π0 decays, copiously produced in QCD jets. The neural network performance is examined in details. The neural network is then used as 'template' variable to measure γ+X process in data with 10 nb-1 of integrated luminosity. The measurement of γγ+X process is also prepared with simulation in the hypothesis of a 10 pb-1 luminosity. Taking into account higher order kinematic effects is necessary to perform the best prediction of H → γγ signal and backgrounds. In the thesis this is carried out with a reweighing method, at NNLO for gg → H → γγ process and for the first time at NLO for γγ+X process, in both cases with doubly differential distributions. Reweighing procedure and γ/π0 neural network are then integrated in the H → γγ analysis to improve CMS

  3. CMS MANAGEMENT MEETINGS

    CERN Multimedia

    Jim Virdee

    Management Board Agendas and minutes of meetings of the Management Board are accessible to CMS members at: http://indico.cern.ch/categoryDisplay.py?categId=223 Collaboration Board Agendas and minutes of meetings of the Collaboration Board are accessible to CMS members at: http://indico.cern.ch/categoryDisplay.py?categId=174 LHCC: Feedback from the CMS Referees, LHCC 97 February 25, 2009. The CMS LHCC referees met with representatives of CMS on 17-2-09, to review progress since the last November minireview. The main topics included  shutdown construction, maintenance and repairs;  status of the preshower detector; commissioning and physics analysis results from cosmic ray running and CSA08;   preparations for physics, off line analysis, computing, and data distribution. TOTEM management and the TOTEM referees then joined us for a joint session to examine the readiness of the TOTEM detector. Detector construction, maintenance, and repairs. The referees congratula...

  4. CMS MANAGEMENT MEETINGS

    CERN Multimedia

    Management Board Agendas and minutes of meetings of the Management Board are accessible to CMS members at: http://indico.cern.ch/categoryDisplay.py?categId=223 Collaboration Board Agendas and minutes of meetings of the Collaboration Board are accessible to CMS members at: http://indico.cern.ch/categoryDisplay.py?categId=174 LHCC: Feedback from the CMS Referees, LHCC 97 February 25, 2009. The CMS LHCC referees met with representatives of CMS on 17-2-09, to review progress since the last November minireview. The main topics included  shutdown construction, maintenance and repairs;  status of the preshower detector; commissioning and physics analysis results from cosmic ray running and CSA08;   preparations for physics, off line analysis, computing, and data distribution. TOTEM management and the TOTEM referees then joined us for a joint session to examine the readiness of the TOTEM detector. Detector construction, maintenance, and repairs. The referees congratulate C...

  5. Pulse Shape Characterization of Silicon Diodes for HGCal with data from Beam Test at CERN

    CERN Document Server

    De Silva, Malinda

    2016-01-01

    The High Luminosity phase of the LHC (starting operation in 2025) will provide unprecedented instantaneous and integrated luminosity, with 25 ns bunch crossing intervals and up to 140 pileup events. A challenge is to provide excellent physics performance in such a harsh environment to fully exploit the HL-LHC potentialities and explore new physics frontiers. In this context, the High Granularity Calorimeter is the detector designed to provide electromagnetic and hadronic energy coverage and reconstruction in the forward direction of the upgraded CMS. In April 2016 and June 2016, a set of 36 diodes were tested in order to understand various characteristics of its performance, in order to use them in the upgraded HG Calorimeter. Here, the silicon diodes were mounted onto a test bench at CERN’s beam test area and exposed to electron showers. Data received from these diodes were acquired and analysed separately. The objective of this report is to show the variation of Time Rise, Time Over Threshold with various...

  6. Development of radiation hard radiation detectors : differences between Czochralski silicon and float zone silicon

    OpenAIRE

    Tuominen, Eija

    2003-01-01

    The purpose of this work was to develop radiation hard silicon detectors. Radiation detectors made of silicon are cost effective and have excellent position resolution. Therefore, they are widely used for track finding and particle analysis in large high-energy physics experiments. Silicon detectors will also be used in the CMS (Compact Muon Solenoid) experiment that is being built at the LHC (Large Hadron Collider) accelerator at CERN (European Organisation for Nuclear Research). This work w...

  7. Some of the participants in the CMS magnet project pose in front of first module, which has just arrived at CERN.

    CERN Multimedia

    Maximilien Brice

    2004-01-01

    Among them: Alain Hervé, CMS technical co-ordinator (holding his helmet); to his right, Pasquale Fabbricatore, in charge of the winding of the CMS magnet, from INFN in Genoa; and to his left, Domenico Campi, head of the CMS magnet group

  8. Romanian President Visits CERN

    CERN Multimedia

    2001-01-01

    Director General Luciano Maiani watches as Romanian President Ion Iliescu signs the CERN guest book. On Friday the 12th of October, Romanian President Ion Iliescu arrived at CERN and was warmly greeted by Director General Luciano Maiani at the steps of building 500. After initial greetings and a general presentation of the laboratory, President Iliescu and his entourage embarked on a whistle stop tour of the CERN facilities. They visited the CMS magnet assembly hall and civil engineering work where presentations were made by CMS spokesperson Michel Della Negra and the ATLAS Tile Calorimeter where the president was introduced to Romanian physicists working here at CERN. Michel Della Negra explains some of the general principles behind CMS to President Iliescu during his visit last week. The Romanian teams working on CERN projects make very visible contributions, for example to the construction of the ATLAS experiment and to the preparation of its eventual scientific exploitation. 'Those of us on the ATLAS ...

  9. Track based alignment of the CMS silicon tracker and its implication on physics performance

    Energy Technology Data Exchange (ETDEWEB)

    Draeger, Jula

    2011-08-15

    In order to fully exploit the discovery potential of the CMS detector for new physics beyond the Standard Model at the high luminosity and centre-of-mass energy provided by the Large Hadron Collider, a careful calibration of the detector and profound understanding of its impact on physics performance are necessary to provide realistic uncertainties for the measurements of physics processes. This thesis describes the track-based alignment of the inner tracking system of CMS with the Millepede II algorithm. Using the combined information of tracks from cosmic rays and collisions taken in 2010, a remarkable local alignment precision has been reached that meets the design specification for most regions of the detector and takes into account instabilities of the detector geometry over time. In addition, the impact of the alignment of b tagging or the Z boson resonance are investigated. The latter is studied to investigate the impact of correlated detector distortions which hardly influence the overall solution of the minimisation problem but introduce biases in the track parameters and thus the derived physics quantities. The determination and constraint of these weak modes present the future challenge of the alignment task at CMS. (orig.)

  10. Track based alignment of the CMS silicon tracker and its implication on physics performance

    International Nuclear Information System (INIS)

    In order to fully exploit the discovery potential of the CMS detector for new physics beyond the Standard Model at the high luminosity and centre-of-mass energy provided by the Large Hadron Collider, a careful calibration of the detector and profound understanding of its impact on physics performance are necessary to provide realistic uncertainties for the measurements of physics processes. This thesis describes the track-based alignment of the inner tracking system of CMS with the Millepede II algorithm. Using the combined information of tracks from cosmic rays and collisions taken in 2010, a remarkable local alignment precision has been reached that meets the design specification for most regions of the detector and takes into account instabilities of the detector geometry over time. In addition, the impact of the alignment of b tagging or the Z boson resonance are investigated. The latter is studied to investigate the impact of correlated detector distortions which hardly influence the overall solution of the minimisation problem but introduce biases in the track parameters and thus the derived physics quantities. The determination and constraint of these weak modes present the future challenge of the alignment task at CMS. (orig.)

  11. Developments for radiation hard silicon detectors by defect engineering - results by the CERN RD48 (ROSE) Collaboration

    Energy Technology Data Exchange (ETDEWEB)

    Lindstroem, G. E-mail: gunnar@sesam.desy.de; Ahmed, M.; Albergo, S.; Allport, P.; Anderson, D.; Andricek, L.; Angarano, M.M.; Augelli, V.; Bacchetta, N.; Bartalini, P.; Bates, R.; Biggeri, U.; Bilei, G.M.; Bisello, D.; Boemi, D.; Borchi, E.; Botila, T.; Brodbeck, T.J.; Bruzzi, M.; Budzynski, T.; Burger, P.; Campabadal, F.; Casse, G.; Catacchini, E.; Chilingarov, A.; Ciampolini, P.; Cindro, V.; Costa, M.J.; Creanza, D.; Clauws, P.; Da Via, C.; Davies, G.; De Boer, W.; Dell' Orso, R.; De Palma, M.; Dezillie, B.; Eremin, V.; Evrard, O.; Fallica, G.; Fanourakis, G.; Feick, H.; Focardi, E.; Fonseca, L.; Fretwurst, E.; Fuster, J.; Gabathuler, K.; Glaser, M.; Grabiec, P.; Grigoriev, E.; Hall, G.; Hanlon, M.; Hauler, F.; Heising, S.; Holmes-Siedle, A.; Horisberger, R.; Hughes, G.; Huhtinen, M.; Ilyashenko, I.; Ivanov, A.; Jones, B.K.; Jungermann, L.; Kaminsky, A.; Kohout, Z.; Kramberger, G.; Kuhnke, M.; Kwan, S.; Lemeilleur, F.; Leroy, C.; Letheren, M.; Li, Z.; Ligonzo, T.; Linhart, V.; Litovchenko, P.; Loukas, D.; Lozano, M.; Luczynski, Z.; Lutz, G.; MacEvoy, B.; Manolopoulos, S.; Markou, A.; Martinez, C.; Messineo, A.; Miku, M.; Moll, M.; Nossarzewska, E.; Ottaviani, G.; Oshea, V.; Parrini, G.; Passeri, D.; Petre, D.; Pickford, A.; Pintilie, I.; Pintilie, L.; Pospisil, S.; Potenza, R.; Radicci, V.; Raine, C.; Rafi, J.M.; Ratoff, P.N.; Richter, R.H.; Riedler, P.; Roe, S.; Roy, P.; Ruzin, A.; Ryazanov, A.I.; Santocchia, A.; Schiavulli, L.; Sicho, P.; Siotis, I.; Sloan, T.; Slysz, W.; Smith, K.; Solanky, M.; Sopko, B.; Stolze, K.; Sundby Avset, B.; Svensson, B.; Tivarus, C.; Tonelli, G.; Tricomi, A.; Tzamarias, S.; Valvo, G.; Vasilescu, A.; Vayaki, A.; Verbitskaya, E.; Verdini, P.; Vrba, V.; Watts, S.; Weber, E.R.; Wegrzecki, M.; Wegrzecka, I.; Weilhammer, P.; Wheadon, R.; Wilburn, C.; Wilhelm, I.; Wunstorf, R.; Wuestenfeld, J.; Wyss, J.; Zankel, K.; Zabierowski, P.; Zontar, D

    2001-06-01

    This report summarises the final results obtained by the RD48 collaboration. The emphasis is on the more practical aspects directly relevant for LHC applications. The report is based on the comprehensive survey given in the 1999 status report (RD48 3rd Status Report, CERN/LHCC 2000-009, December 1999), a recent conference report (Lindstroem et al. (RD48)), and some latest experimental results. Additional data have been reported in the last ROSE workshop (5th ROSE workshop, CERN, CERN/LEB 2000-005). A compilation of all RD48 internal reports and a full publication list can be found on the RD48 homepage (http://cern.ch/RD48/). The success of the oxygen enrichment of FZ-silicon as a highly powerful defect engineering technique and its optimisation with various commercial manufacturers are reported. The focus is on the changes of the effective doping concentration (depletion voltage). The RD48 model for the dependence of radiation effects on fluence, temperature and operational time is verified; projections to operational scenarios for main LHC experiments demonstrate vital benefits. Progress in the microscopic understanding of damage effects as well as the application of defect kinetics models and device modelling for the prediction of the macroscopic behaviour has also been achieved but will not be covered in detail.

  12. Developments for radiation hard silicon detectors by defect engineering - results by the CERN RD48 (ROSE) Collaboration

    International Nuclear Information System (INIS)

    This report summarises the final results obtained by the RD48 collaboration. The emphasis is on the more practical aspects directly relevant for LHC applications. The report is based on the comprehensive survey given in the 1999 status report (RD48 3rd Status Report, CERN/LHCC 2000-009, December 1999), a recent conference report (Lindstroem et al. (RD48), and some latest experimental results. Additional data have been reported in the last ROSE workshop (5th ROSE workshop, CERN, CERN/LEB 2000-005). A compilation of all RD48 internal reports and a full publication list can be found on the RD48 homepage (http://cern.ch/RD48/). The success of the oxygen enrichment of FZ-silicon as a highly powerful defect engineering technique and its optimisation with various commercial manufacturers are reported. The focus is on the changes of the effective doping concentration (depletion voltage). The RD48 model for the dependence of radiation effects on fluence, temperature and operational time is verified; projections to operational scenarios for main LHC experiments demonstrate vital benefits. Progress in the microscopic understanding of damage effects as well as the application of defect kinetics models and device modelling for the prediction of the macroscopic behaviour has also been achieved but will not be covered in detail

  13. The CMS Electronic Logbook

    CERN Multimedia

    Bukowiec, S; Beccati, B; Behrens, U; Biery, K; Branson, J; Cano, E; Cheung, H; Ciganek, M; Cittolin, S; Coarasa Perez, J A; Deldicque, C; Erhan, S; Gigi, D; Glege, F; Gomez-Reino, R; Hatton, D; Hwong, Y L; Loizides, C; Ma, F; Masetti, L; Meijers, F; Meschi, E; Meyer, A; Mommsen, R K; Moser, R; O’Dell, V; Orsini, L; Paus, C; Petrucci, A; Pieri, M; Racz, A; Raginel, O; Sakulin, H; Sani, M; Schieferdecker, P; Schwick, C; Shpakov, D; Simon, M; Sumorok, K; Sungho Yoon, A

    2010-01-01

    The CMS ELogbook (ELog) is a collaborative tool, which provides a platform to share and store information about various events or problems occurring in the Compact Muon Solenoid (CMS) experiment at CERN during operation. The ELog is based on a Model–View–Controller (MVC) software architectural pattern and uses an Oracle database to store messages and attachments. The ELog is developed as a pluggable web component in Oracle Portal in order to provide better management, monitoring and security.

  14. Evacuation drill at CMS

    CERN Multimedia

    Niels Dupont-Sagorin and Christoph Schaefer

    2012-01-01

    Training personnel, including evacuation guides and shifters, checking procedures, improving collaboration with the CERN Fire Brigade: the first real-life evacuation drill at CMS took place on Friday 3 February from 12p.m. to 3p.m. in the two caverns located at Point 5 of the LHC.   CERN personnel during the evacuation drill at CMS. Evacuation drills are required by law and have to be organized periodically in all areas of CERN, both above and below ground. The last drill at CMS, which took place in June 2007, revealed some desiderata, most notably the need for a public address system. With this equipment in place, it is now possible to broadcast audio messages from the CMS control room to the underground areas.   The CMS Technical Coordination Team and the GLIMOS have focused particularly on preparing collaborators for emergency situations by providing training and organizing regular safety drills with the HSE Unit and the CERN Fire Brigade. This Friday, the practical traini...

  15. 9 February 2012 - Permanent Representative of the Kingdom of Spain to the United Nations Office at Geneva and other International Organisations, Ambassador A. Santos Maraver signing the guest book with CERN Director-General; in the CERN Control Centre with N. Catalan; visiting the LHC tunnel at Point 5 and CMS underground experimental area with Collaboration Spokesperson J. Incandela; throughout accompanied by Adviser J. Salicio Diez and Former Physics Deputy Department Head L. Alvarez Gaumé.

    CERN Multimedia

    Visual Media Office

    2012-01-01

    9 February 2012 - Permanent Representative of the Kingdom of Spain to the United Nations Office at Geneva and other International Organisations, Ambassador A. Santos Maraver signing the guest book with CERN Director-General; in the CERN Control Centre with N. Catalan; visiting the LHC tunnel at Point 5 and CMS underground experimental area with Collaboration Spokesperson J. Incandela; throughout accompanied by Adviser J. Salicio Diez and Former Physics Deputy Department Head L. Alvarez Gaumé.

  16. 21 May 2013 - Greek Minister of Health A. Lykouretzos signing the guest book with CERN Director-General R. Heuer; visiting the LHC tunnel at POint 5 and CMS experimental cavern with Deputy Spokesperson T. Camporesi. CERN-HERMES Network Technical Coordinator E. Dimovasili; Life Sciences Adviser M. Dosanjh; National Contact Physicist, ATLAS Collaboration, NTU, Athens E. Gazis and International Relations Adviser R. Voss accompany the delegation throughout.

    CERN Multimedia

    Anna Pantelia

    2013-01-01

    21 May 2013 - Greek Minister of Health A. Lykouretzos signing the guest book with CERN Director-General R. Heuer; visiting the LHC tunnel at POint 5 and CMS experimental cavern with Deputy Spokesperson T. Camporesi. CERN-HERMES Network Technical Coordinator E. Dimovasili; Life Sciences Adviser M. Dosanjh; National Contact Physicist, ATLAS Collaboration, NTU, Athens E. Gazis and International Relations Adviser R. Voss accompany the delegation throughout.

  17. CMS computing support at JINR

    International Nuclear Information System (INIS)

    Participation of JINR specialists in the CMS experiment at LHC requires a wide use of computer resources. In the context of JINR activities in the CMS Project hardware and software resources have been provided for full participation of JINR specialists in the CMS experiment; the JINR computer infrastructure was made closer to the CERN one. JINR also provides the informational support for the CMS experiment (web-server http://sunct2.jinr.dubna.su). Plans for further CMS computing support at JINR are stated

  18. Electrical measurements of silicon sensors for the upgrade of the CMS detector

    International Nuclear Information System (INIS)

    Because of the upgrade in the LHC (2020-2022), in which the luminosity is increased to above 5.1034 cm-2s-1, in the CMS tracker a much higher radiation exposure than hitherto is to be expected. Therefore radiation-hardened sensors are required. For this reason in the framework of the Hamamatsu-Photonics-KK campaign among others Mpix sensors are studied. Furthermore they are tested concerning their material properties by characterizing befor and after the irradiation. Also the optimal geometry is searched for. This thesis studies two substrate types of the same thickness with two isolating mechanisms. Thereby also the influence of the geometry and different bias structures is regarded in order to draw conclusions on the radiation hardness.

  19. Design and development of a vertex reconstruction for the CMS (Compact Muon Solenoid) data. Study of gaseous and silicon micro-strips detectors (MSGC)

    International Nuclear Information System (INIS)

    The work presented in this thesis has contributed to the development of the Compact Muon Solenoid detector (CMS) that will be installed at the future Large Hadron Collider (LHC) which will start running in summer 2007. This report is organised in three parts: the study of gaseous detectors and silicon micro-strips detectors, and a development of a software for the reconstruction and analysis of CMS data in the framework of ORCA. First, the micro-strips gaseous detectors (MSGC) study was on the ultimate critical irradiation test before their substitution in the CMS tracker. This test showed a really small number of lost anodes and a stable signal to noise ratio. This test proved that the described MSGC fulfill all the requirements to be integrated in the CMS tracker. The following contribution described a study of silicon micro-strips detectors and its electronics exposed to a 40 MHz bunched LHC like beam. These tests indicated a good behaviour of the data acquisition and control system. The signal to noise ratio, the bunch crossing identification and the cluster finding efficiency had also be analysed. The last study concern the design and the development of an ORCA algorithm dedicates to secondary vertex reconstruction. This iterative algorithm aims to be use for b tagging. This part analyse also primary vertex reconstruction in events without and with pile up. (author)

  20. A productive year for CMS

    CERN Multimedia

    2010-01-01

      Some of the many results obtained by CMS since the start of data-taking in 2010. If you have any comments / suggestions please contact the editors: Marzena Lapka (marzena.lapka@cern.ch) and Achintya Rao (achintya.rao@cern.ch)

  1. 1st February 2011-CERN Cultural Board for Engaging with the Arts, visiting CMS experimental area and LHC Tunnel at Point 5

    CERN Multimedia

    Michael Hoch

    2011-01-01

    Photo 1-4: Visit to CMS Control Room with G. Tonelli,CMS Collaboration Spokesperson Photo 5-9,16-20:CMS experimental area Photo 10-15:LHC Tunnel at Point 5 Photo 21:F. Madlener,Director of IRCAM Paris+S. Dorny,Director-General Lyon Opera House+C. Bollman,Art by Genève+M. Doser,AEgIS Collaboration Spokesperson,Former Physics Department Deputy Head+A. Koek,International Arts Development+G. Tonelli+M. Monje Cano,Arts Development Assistant (part-time work experience)+B. Ruf,Director of Kunsthalle Zürich

  2. CERN videonews magazine Nr 1 : October 2002

    CERN Multimedia

    Audiovideo Service; Photolab

    2002-01-01

    News from : . ATHENA : thousands of cold anti-atoms produced at CERN. (CERN Bulletin 39/2002) . CMS ECAL : news on the progress on the construction of the CMS detector . MICROCOSM : inauguration of a full-scale model of the LHC.(CERN Bulletin 42/2002) . Fete de la Science : 14-20 October 2002 in Pays de Gex. (CERN Bulletin 42/2002) . Diaporama : events from the last months

  3. 11 March 2009 - Italian Minister of Education, University and Research M. Gelmini, visiting ATLAS and CMS underground experimental areas and LHC tunnel with Director for Research and Scientific Computing S. Bertolucci. Signature of the guest book with CERN Director-General R. Heuer and S. Bertolucci at CMS Point 5.

    CERN Multimedia

    Maximilien Brice

    2009-01-01

    Members of the Ministerial delegation: Cons. Amb. Sebastiano FULCI, Consigliere Diplomatico Dott.ssa Elisa GREGORINI, Segretario Particolare del Ministro Dott. Massimo ZENNARO, Responsabile rapporti con la stampa Prof. Roberto PETRONZIO, Presidente dell’INFN (Istituto Nazionale di Fisica Nucleare) Dott. Luciano CRISCUOLI, Direttore Generale della Ricerca, MIUR Dott. Andrea MARINONI, Consulente scientifico del Ministro CERN delegation present throughout the programme: Prof. Sergio Bertolucci, Director for Research and Scientific Computing Prof. Fabiola Gianotti, ATLAS Collaboration Spokesperson Prof. Paolo Giubellino, ALICE Deputy Spokesperson, Universita & INFN, Torino Prof. Guido Tonelli, CMS Collaboration Deputy Spokesperson, INFN Pisa Dr Monica Pepe-Altarelli, LHCb Collaboration CERN Team Leader Guests in the ATLAS exhibition area: Dr Marcello Givoletti\tPresident of CAEN Dr Davide Malacalza\tPresident of ASG Ansaldo Superconductors and users: Prof. Clara Matteuzzi, LHCb Collaboration, Universita' d...

  4. Deployment of the CMS Tracker AMC as backend for the CMS pixel detector

    International Nuclear Information System (INIS)

    The silicon pixel detector of the CMS experiment at CERN will be replaced with an upgraded version at the beginning of 2017 with the new detector featuring an additional barrel- and end-cap layer resulting in an increased number of fully digital read-out links running at 400 Mbps. New versions of the PSI46 Read-Out Chip and Token Bit Manager have been developed to operate at higher rates and reduce data loss. Front-End Controller and Front-End Driver boards, based on the μTCA compatible CMS Tracker AMC, a variant of the FC7 card, are being developed using different mezzanines to host the optical links for the digital read-out and control system. An overview of the system architecture is presented, with details on the implementation, and first results obtained from test systems

  5. Deployment of the CMS Tracker AMC as Backend for the CMS Pixel Detector

    CERN Document Server

    Auzinger, Georg

    2015-01-01

    The silicon pixel detector of the CMS experiment at CERN will be replaced with an upgraded version at the beginning of 2017 with the new detector featuring an additional barrel- and end-cap layer resulting in an increased number of fully digital read-out links running at 400Mb/s. New versions of the PSI46 Read-Out Chip and Token Bit Manager have been developed to operate at higher rates and reduce data loss. Front-End Controller and Front-End Driver boards, based on the {\\textmu}TCA compatible CMS Tracker AMC, a variant of the FC7 card, are being developed using different mezzanines to host the optical links for the digital read-out and control system. An overview of the system architecture is presented, with details on the implementation, and first results obtained from test systems.

  6. The CMS Computing Model

    International Nuclear Information System (INIS)

    The CMS experiment at LHC has developed a baseline Computing Model addressing the needs of a computing system capable to operate in the first years of LHC running. It is focused on a data model with heavy streaming at the raw data level based on trigger, and on the achievement of the maximum flexibility in the use of distributed computing resources. The CMS distributed Computing Model includes a Tier-0 centre at CERN, a CMS Analysis Facility at CERN, several Tier-1 centres located at large regional computing centres, and many Tier-2 centres worldwide. The workflows have been identified, along with a baseline architecture for the data management infrastructure. This model is also being tested in Grid Service Challenges of increasing complexity, coordinated with the Worldwide LHC Computing Grid community

  7. 15th December 2010 - World Intellectual Property Organization Director-General F. Gurry signing the guest book with CERN Director-General R. Heuer; visiting CMS control room, experimental cavern and LHC tunnel with Collaboration Deputy Spokesperson J. Incandela, accompanied by M. Bona.

    CERN Multimedia

    Maximilien Brice

    2010-01-01

    CERN-HI-1012325 36, from left to right: WIPO Arbitration and Mediation Center, Global Issues Sector Director E. Wilbers; CERN Adviser, Relations with International Organisations, M. Bona; CMS Collaboration Deputy Spokesperson, University of California Santa Barbara J. Incandela; WIPO Deputy Director General, Global Issues Sector J. C. Wichard; WIPO Director-General F. Gurry; WIPO Executive Director and Chief of Staff, Office of the Director General N. Prasad.

  8. The CMS tracker control system

    Science.gov (United States)

    Dierlamm, A.; Dirkes, G. H.; Fahrer, M.; Frey, M.; Hartmann, F.; Masetti, L.; Militaru, O.; Shah, S. Y.; Stringer, R.; Tsirou, A.

    2008-07-01

    The Tracker Control System (TCS) is a distributed control software to operate about 2000 power supplies for the silicon modules of the CMS Tracker and monitor its environmental sensors. TCS must thus be able to handle about 104 power supply parameters, about 103 environmental probes from the Programmable Logic Controllers of the Tracker Safety System (TSS), about 105 parameters read via DAQ from the DCUs in all front end hybrids and from CCUs in all control groups. TCS is built on top of an industrial SCADA program (PVSS) extended with a framework developed at CERN (JCOP) and used by all LHC experiments. The logical partitioning of the detector is reflected in the hierarchical structure of the TCS, where commands move down to the individual hardware devices, while states are reported up to the root which is interfaced to the broader CMS control system. The system computes and continuously monitors the mean and maximum values of critical parameters and updates the percentage of currently operating hardware. Automatic procedures switch off selected parts of the detector using detailed granularity and avoiding widespread TSS intervention.

  9. Life@CMS: Combining Higgs search data with ATLAS

    CERN Multimedia

    CERN

    2011-01-01

    First combined results from the CMS and ATLAS Higgs search at the LHC. Including exclusive footage from internal CMS meetings. For more information, visit: http://cms.web.cern.ch/news/atlas-and-cms-combine-summer-11-search-limits-standard-model-higgs

  10. CMS Factsheet

    CERN Multimedia

    Davis, Siona Ruth

    2016-01-01

    CMS Factsheets: containing facts about the CMS collaboration and detector. Printed copies of the English version are available from the CMS Secretariat. Responsible for translations: English only - E.Gibney (updated 2015)

  11. Performance of the prototype readout system for the CMS endcap hadron calorimeter upgrade

    CERN Document Server

    Pastika, Nathaniel Joseph

    2015-01-01

    The CMS experiment at the CERN Large Hadron Collider (LHC) will upgrade the photon detection and readout systems of its barrel and endcap hadron calorimeters (HCAL) through the second long shutdown of the LHC in 2018. The upgrade includes new silicon photomultipliers (SiPMs), SiPM control electronics, signal digitization via the Fermilab QIE11 ASIC, data formatting and serialization via a Microsemi FPGA, and data transmission via CERN Versatile Link technology. The first prototype system for the endcap HCAL has been assembled and characterized on the bench and in a test beam. The design of this new system and prototype performance is described.

  12. Performance of the prototype readout system for the CMS endcap hadron calorimeter upgrade

    Science.gov (United States)

    Pastika, N. J.

    2016-03-01

    The CMS experiment at the CERN Large Hadron Collider (LHC) will upgrade the photon detection and readout systems of its barrel and endcap hadron calorimeters (HCAL) through the second long shutdown of the LHC in 2018. The upgrade includes new silicon photomultipliers (SiPMs), SiPM control electronics, signal digitization via the Fermilab QIE11 ASIC, data formatting and serialization via a Microsemi FPGA, and data transmission via CERN Versatile Link technology. The first prototype system for the endcap HCAL has been assembled and characterized on the bench and in a test beam. The design of this new system and prototype performance are described.

  13. Production of CMS FPIX detector modules and development of novel radiation-hard silicon sensors for future upgrades of the LHC

    Science.gov (United States)

    Koybasi, Ozhan

    The Compact Muon Solenoid (CMS) experiment currently taking data at the Large Hadron Collider (LHC) has the largest ever built all-silicon tracking system with a pixel detector as the innermost component. The pixel detector consists of three 53 cm long barrel layers (BPIX) at radial distances of r= 4.4, 7.3, and 10.2 cm from the interaction point complemented with two end-cap disks (FPIX) on each side of the interaction region covering radial distances from ˜6 cm to 15 cm. The development, production, and qualification of the silicon detector modules used for the construction of the CMS FPIX disks are described. The plan for the luminosity upgrade of the LHC foresees a phase I upgrade increasing the peak luminosity from 1034 cm.2s.1 (original design figure) to 2-3 x 1034 cm-2s-1 after about 5 years of operation, followed by phase II upgrade eventually reaching a value of 5x1034 cm-2 s-1 (the so-called "High Luminosity-LHC" or "HL-LHC"). At Phase I, the CMS pixel detector will be replaced by a new detector, which will have an additional fourth barrel layer at r=16 cm and two extra forward disks on each side with radial coverage of all disks increased to r =4.5-16.1 cm. Although the present non- n silicon pixel sensor technology meets the performance requirements, it is possible to achieve the same performance with the relatively new n-on-p technology, which would reduce the cost by ˜50%. The phase II upgrade, on the other hand, faces a challenge for the detector technology to be adopted for the innermost tracking layers (at r ˜ 4 cm) where the radiation fluence is expected to reach values close to 1016 neq /cm2, since the conventional planar silicon sensors are functional only up to a fluence of ˜1015 neq/cm2. The 3D silicon sensor technology is regarded as one of the most promising solutions for the radiation tolerance requirements of innermost pixel tracking layers at the HL-LHC. Improvements to the current n-on-n silicon pixel sensor design; and development

  14. 28 June 2012 - Ambassador I. Piperkov, Permanent Representative of Bulgaria to the United Nations Office and other international organisations in Geneva and Spouse visiting CMS experimental area with Collaboration Deputy Spokesperson T. Camporesi and CERN Control Centre with M. Benedikt.Senior physicist L. Litov accompanies the delegation throughout.

    CERN Multimedia

    Jean-Claude Gadmer

    2012-01-01

    28 June 2012 - Ambassador I. Piperkov, Permanent Representative of Bulgaria to the United Nations Office and other international organisations in Geneva and Spouse visiting CMS experimental area with Collaboration Deputy Spokesperson T. Camporesi and CERN Control Centre with M. Benedikt.Senior physicist L. Litov accompanies the delegation throughout.

  15. 18 January 2011 - The British Royal Academy of Engineering in the LHC tunnel with CMS Collaboration Spokesperson G. Tonelli and Beams Department Head P. Collier; in the CERN Control Centre with P. Collier and LHC superconducting magnet test hall with Technology Department Head F. Bordry.

    CERN Multimedia

    Jean-Claude Gadmer

    2011-01-01

    18 January 2011 - The British Royal Academy of Engineering in the LHC tunnel with CMS Collaboration Spokesperson G. Tonelli and Beams Department Head P. Collier; in the CERN Control Centre with P. Collier and LHC superconducting magnet test hall with Technology Department Head F. Bordry.

  16. 21 June 2010 - TUBITAK Vice President A. Adli signing the guest book with CERN Director-General R. Heuer, visiting the ATLAS control room at Point 1 with Former Collaboration Spokesperson P. Jenni and CMS Control Centre, building 354, with Collaboration Spokesperson G. Tonelli. Throughout accompanied by Adviser J. Ellis.

    CERN Multimedia

    Maximilien Brice

    2010-01-01

    21 June 2010 - TUBITAK Vice President A. Adli signing the guest book with CERN Director-General R. Heuer, visiting the ATLAS control room at Point 1 with Former Collaboration Spokesperson P. Jenni and CMS Control Centre, building 354, with Collaboration Spokesperson G. Tonelli. Throughout accompanied by Adviser J. Ellis.

  17. 31 August 2008 - Secretary General of the United Nations Ban Ki-moon visiting CMS experimental underground area and LHC tunnel with CERN Director-General R. Aymar and Collaboration Spokesperson T. Virdee. Director-General of the United Nations Office at Geneva S. Ordzhonikidze also present.

    CERN Multimedia

    Maximilien Brice

    2008-01-01

    Also present on the photographs: Guests: Representative of the French Republic O. Laurens-Bernard, Sous Préfet de Gex Deputy Permanent representative C. Guilhou, Permanent Mission of France to the UN CERN: CMS Collaboration Technical Coordinator A. Ball Chief Scientific Officer, Deputy Director-General J. Engelen Group Leader in matter of Safety C. Schaefer LHC engineer in charge L. Ponce

  18. 5 June 2013 - Sri Lankan Senior Minister of Scientific Affairs T. Vitharana signing the guest book with Director-General R. Heuer, in the LHC tunnel at Point 5 with International Relations Adviser R. Voss and in the CMS cavern with CERN Team leader A. Petrilli.

    CERN Multimedia

    Jean-Claude Gadmer

    2013-01-01

    5 June 2013 - Sri Lankan Senior Minister of Scientific Affairs T. Vitharana signing the guest book with Director-General R. Heuer, in the LHC tunnel at Point 5 with International Relations Adviser R. Voss and in the CMS cavern with CERN Team leader A. Petrilli.

  19. 25 April 2012 - Latvia Riga Technical University Rector L. Ribickis signing the guest book with CERN Director-General R. Heuer and visiting the LHC tunnel at Point 5 and CMS experimental cavern with Deputy Spokesperson T. Camporesi and Adviser for the Republic of Latvia T. Kurtyka.

    CERN Multimedia

    Maximilien Brice

    2012-01-01

    25 April 2012 - Latvia Riga Technical University Rector L. Ribickis signing the guest book with CERN Director-General R. Heuer and visiting the LHC tunnel at Point 5 and CMS experimental cavern with Deputy Spokesperson T. Camporesi and Adviser for the Republic of Latvia T. Kurtyka.

  20. 16 Augur 2013 -Bulgarian Minister of Education and Sciences A. Klisarova visiting the LHC tunnel with S. Russenschuck and CMS experimental cavern with Deputy Spokesperson T. Camporesi and V. Genchev ; signing the guest book with CERN Director-General R. Heuer. Accompanied throughout by P. Hristov, L. Litov, R. Voss and Z. Zaharieva.

    CERN Multimedia

    Anna Pantelia

    2013-01-01

    16 Augur 2013 -Bulgarian Minister of Education and Sciences A. Klisarova visiting the LHC tunnel with S. Russenschuck and CMS experimental cavern with Deputy Spokesperson T. Camporesi and V. Genchev ; signing the guest book with CERN Director-General R. Heuer. Accompanied throughout by P. Hristov, L. Litov, R. Voss and Z. Zaharieva.

  1. 20th May 2010 - Malaysian Minister for Science, Technology and Innovation H. F: B. H. Yusof signing the guest book with Coordinator for External Relations F. Pauss and CMS Collaboration Deputy Spokesperson A. De Roeck; visiting the LHC superconducting magnet test hall with Technology Department Head F. Bordry; throughout accompanied by CERN Advisers J. Ellis and E. Tsesmelis.

    CERN Document Server

    Maximilien brice

    2010-01-01

    20th May 2010 - Malaysian Minister for Science, Technology and Innovation H. F: B. H. Yusof signing the guest book with Coordinator for External Relations F. Pauss and CMS Collaboration Deputy Spokesperson A. De Roeck; visiting the LHC superconducting magnet test hall with Technology Department Head F. Bordry; throughout accompanied by CERN Advisers J. Ellis and E. Tsesmelis.

  2. 19 April 2013 - The University of Chicago Vice President for Research and for National Laboratories D. H. Levy signing the guest book with CERN Director for Accelerators and Technology S. Myers; in the LHC tunnel with L. Bottura; throughout accompanied by US CMS J. Butler. Mrs Levy and Mrs Butler took part.

    CERN Multimedia

    Anna Pantelia

    2013-01-01

    19 April 2013 - The University of Chicago Vice President for Research and for National Laboratories D. H. Levy signing the guest book with CERN Director for Accelerators and Technology S. Myers; in the LHC tunnel with L. Bottura; throughout accompanied by US CMS J. Butler. Mrs Levy and Mrs Butler took part.

  3. CMS tracking challenges yesterday, today and tomorrow

    CERN Document Server

    Brondolin, Erica

    2015-01-01

    The Compact Muon Solenoid (CMS) is one of the two general purpose experiments at the Large Hadron Collider (CERN). Until 2012 (Run1), pp collisions have been delivered with a minimal bunch time separation of 50 ns and a mean of about 15 collisions per bunch crossing. After the end of the long shut-down this year, LHC is foreseen to ultimately exceed an instantaneous luminosity of $10^{34}cm^{-2}s^{-1}$, which means a bunch time separation of 25 ns with a mean of more than 25 inelastic collisions superimposed on the event of interest (Run2). In this high-occupancy environment, obtaining a precise particle momentum reconstruction is one of the biggest challenges. To this end, the CMS collaboration has constructed the largest silicon tracker ever and has developed a sophisticated tracking software, that is able to successfully reconstruct the hundreds of tracks produced in each beam crossing.However, more challenges lie ahead. CERN is planning an upgrade program of the LHC collider which will bring the luminosi...

  4. CMS Industries awarded gold, crystal

    CERN Multimedia

    2006-01-01

    The CMS collaboration honoured 10 of its top suppliers in the seventh annual awards ceremony The representatives of the firms that recieved the CMS Gold and Crystal Awards stand with their awards after the ceremony. The seventh annual CMS Awards ceremony was held on Monday 13 March to recognize the industries that have made substantial contributions to the construction of the collaboration's detector. Nine international firms received Gold Awards, and General Tecnica of Italy received the prestigious Crystal Award. Representatives from the companies attended the ceremony during the plenary session of CMS week. 'The role of CERN, its machines and experiments, beyond particle physics is to push the development of equipment technologies related to high-energy physics,'said CMS Awards Coordinator Domenico Campi. 'All of these industries must go beyond the technologies that are currently available.' Without the involvement of good companies over the years, the construction of the CMS detector wouldn't be possible...

  5. Electrical measurements of silicon sensors for the upgrade of the CMS detector; Vermessung von Siliziumsensoren fuer das Upgrade des CMS-Detektors

    Energy Technology Data Exchange (ETDEWEB)

    Stegler, Martin

    2013-05-15

    Because of the upgrade in the LHC (2020-2022), in which the luminosity is increased to above 5.10{sup 34} cm{sup -2}s{sup -1}, in the CMS tracker a much higher radiation exposure than hitherto is to be expected. Therefore radiation-hardened sensors are required. For this reason in the framework of the Hamamatsu-Photonics-KK campaign among others Mpix sensors are studied. Furthermore they are tested concerning their material properties by characterizing befor and after the irradiation. Also the optimal geometry is searched for. This thesis studies two substrate types of the same thickness with two isolating mechanisms. Thereby also the influence of the geometry and different bias structures is regarded in order to draw conclusions on the radiation hardness.

  6. Performance studies for the new CMS Outer Tracker module concept at HL-LHC based on measurements of charge collection properties in irradiated silicon sensors

    International Nuclear Information System (INIS)

    In order to increase the discovery potential of the experiments at the Large Hadron Collider, the high-luminosity phase of the LHC (HL-LHC) is expected to deliver a total of 3000 fb−1 integrated luminosity. The instantaneous luminosity will be increased by a factor of five compared to the LHC design luminosity. This results in an intensified track density and radiation level especially in the tracking systems, requiring new radiation hard silicon sensors for the CMS Outer Tracker. To cope with the increased track density and trigger rates, a new module concept based on the coincidence of hits in two closely stacked sensors is pursued for the new tracker, allowing the use of tracking and transverse momentum information already at the first trigger level. The performance of the new trigger module concept has been studied using a parametrization of the charge drift in the electric and magnetic field in the sensor. From that, the phase-space of efficient operation for this module concept and the binary readout in terms of collected charge and noise has been explored. - Highlights: • A module concept for the use in the upgraded CMS tracker at the HL-LHC is investigated. • The module provides track momentum information to the first trigger level of CMS. • pT-information is obtained by correlation of hits in two closely stacked sensors. • The performance is studied using a parametrization of the sensor response. • The possible phase-space of noise and clustering threshold is evaluated

  7. CMS central barrel yoke

    CERN Multimedia

    Maximilien Brice

    2002-01-01

    The CMS experiment at CERN will use a massive solenoid housed within this return yoke, which will weigh 12 500 tonnes when completed. Magnetic fields generated within this structure will reach levels greater than any other magnet of this kind and will store enough energy to melt 18 tonnes of gold. Within the yoke is positioned the external vacuum chamber into which the solenoid will be placed.

  8. CMS lead tungstate crystals

    CERN Multimedia

    Laurent Guiraud

    2000-01-01

    These crystals are made from lead tungstate, a crystal that is as clear as glass yet with nearly four times the density. They have been produced in Russia to be used as scintillators in the electromagnetic calorimeter on the CMS experiment, part of the LHC project at CERN. When an electron, positron or photon passes through the calorimeter it will cause a cascade of particles that will then be absorbed by these scintillating crystals, allowing the particle's energy to be measured.

  9. Track Reconstruction in Heavy Ion Events using the CMS Tracker

    CERN Document Server

    Roland, Christof

    2006-01-01

    The Large Hadron Collider at CERN will collide protons at sqrt{S}=14 TeV and lead ions at sqrt{S_{NN} =5.5 TeV. The study of heavy ion collisions is an integral part of the physics program of the Compact Muon Solenoid (CMS). Central heavy ion events at LHC energies are expected to produce a multiplicity of 1500 to 4000 charged particles per unit of rapidity. The CMS detector features a large acceptance and high resolution silicon tracker consisting of pixel and strip detector layers. In this note the algorithms used for pattern recognition in the very high track density environment of heavy ion collisions will be described. Detailed studies using the full detector simulation and reconstruction are presented and achieved reconstruction efficiencies, fake rates and resolutions are discussed.

  10. Optical readout and control systems for the CMS tracker

    CERN Document Server

    Troska, Jan K; Faccio, F; Gill, K; Grabit, R; Jareno, R M; Sandvik, A M; Vasey, F

    2003-01-01

    The Compact Muon Solenoid (CMS) Experiment will be installed at the CERN Large Hadron Collider (LHC) in 2007. The readout system for the CMS Tracker consists of 10000000 individual detector channels that are time-multiplexed onto 40000 unidirectional analogue (40 MSample /s) optical links for transmission between the detector and the 65 m distant counting room. The corresponding control system consists of 2500 bi-directional digital (40 Mb/s) optical links based as far as possible upon the same components. The on-detector elements (lasers and photodiodes) of both readout and control links will be distributed throughout the detector volume in close proximity to the silicon detector elements. For this reason, strict requirements are placed on minimal package size, mass, power dissipation, immunity to magnetic field, and radiation hardness. It has been possible to meet the requirements with the extensive use of commercially available components with a minimum of customization. The project has now entered its vol...

  11. The CMS conductor

    CERN Document Server

    Blau, Bertrand; Curé, B; Folch, R; Hervé, A; Horváth, I L; Kircher, F; Musenich, R; Neuenschwander, J; Riboni, P; Seeber, B; Tavares, S; Sgobba, Stefano; Smith, R P

    2002-01-01

    The Compact Muon Solenoid (CMS) is one of the general-purpose detectors to be provided for the LHC project at CERN. The design field of the CMS superconducting magnet is 4 T, the magnetic length is 12.5 m and the free bore is 6 m. The magnetic field is achieved by means of a four-layer superconducting solenoid. The stored magnetic energy is 2.7 GJ at nominal current of 20 kA (at 4.5 K operating temperature). The coil is wound from a high purity aluminum- stabilized Rutherford type conductor. Unlike other existing Al- stabilized thin solenoids, the structural integrity of the CMS coil is ensured both by the Al-alloy reinforcement welded to the conductor and an external support cylinder. The flat NbTi cable is embedded in high purity aluminum by a continuous co-extrusion process. (7 refs).

  12. Proposal to negotiate an amendment to an existing contract for the supply of thick 6 inch silicon micro-strip sensors for the CMS tracker

    CERN Document Server

    2004-01-01

    This document concerns the proposal to negotiate an amendment to an existing contract for the supply of thick 6 inch silicon micro-strip sensors for the CMS tracker. For the reasons explained in this document, the Finance Committee is invited to approve an amendment to an existing contract with HAMAMATSU PHOTONICS (CH) for the supply of 7 000 thick 6 inch silicon micro-strip sensors for the CMS tracker, for an amount of 3 248 000 euros (5 131 840 Swiss francs), not subject to revision, with an option for up to 11 000 additional sensors, for a maximum amount of 4 708 000 euros (7 438 640 Swiss francs), not subject to revision, bringing the total maximum amount of the amendment to 7 956 000 euros (12 570 480 Swiss francs) not subject to revision. This total maximum amount will be added to the initial contract amount of 415 835 000 Japanese yen (4 879 824 Swiss francs), not subject to revision. The amounts in Swiss francs have been calculated using the present rate of exchange. The firm has indicated the followi...

  13. Muse at CERN

    CERN Multimedia

    CERN Bulletin

    2016-01-01

    On 19 July, the world-famous, English rock band, Muse, visited CERN before taking centre-stage at Nyon’s Paléo Festival. They toured some of CERN’s installations, including the Synchrocyclotron and the Microcosm exhibition, and also looked in on CMS and the Antimatter Factory.    

  14. Bhutan at CERN

    CERN Multimedia

    2002-01-01

    On Tuesday 12 March, CERN received an extraordinary visitor, a very great representative of a very tiny country. His Royal Highness, Dasho Jigme Khesar Namgyal Wangchuk, Crown Prince of Bhutan, visited the assembly site of CMS. For those whose geographical knowledge is weak, Bhutan is a tiny bhuddist kingdom, nestled in the Himalayas and surrounded by two giants, India and China.

  15. Silicon tracker end cap of the CMS experiment at LHC and study of the discovery potential for resonances decaying in top quark pairs

    International Nuclear Information System (INIS)

    The first part of this thesis is dedicated to the integration of one silicon tracker end cap of the CMS experiment. The procedures implemented and the tests that led to the qualification of the detection system are presented in this document. The first chapter is an introduction to the LHC and to the CMS experiment. The second chapter is dedicated to the CMS tracker, that is a detector made up of silicon micro-stripe whose purpose is to reconstruct the tracks of charged-particles, to measure their momentum, to reconstruct vertex and to contribute to the tagging of heavy flavour quarks. The third chapter presents the integration of one of the tracker end caps. The second part of this thesis is dedicated to the search for new physics in the top quark sector. One of the most promising channel is to look for a resonance in the invariant mass distribution of top quark pairs. The fourth chapter is a theoretical introduction to this work, the standard model is introduced and the top quarks physics as well as tt-bar resonances are highlighted. The fifth chapter describes the tools used to analyse data, all the data come from simulations. The search for tt-bar resonances is presented in the last chapter. This search involves a method to select right events, a strategy to reduce background noise and a method for the reconstruction of the events. A kinematical adjustment is made to identify the right combinations of jets and to improve the experimental resolution on the invariant mass. The full simulation analysis in the 'lepton + jets' channel shows that at the TeV scale, processes from a few hundred fb to one pb could be observed in the early years of data taking

  16. Study of ZZ diboson final states in the leptons-neutrinos decay channel with the CMS experiment at the LHC at CERN

    International Nuclear Information System (INIS)

    This thesis presents a study of ZZ final states performed with data recorded with the CMS detector at LHC. This study exploits the first data delivered by the LHC and recorded by CMS in 2010 and 2011. The ZZ production cross section is measured and limits are set on neutral electroweak triple gauge couplings. The measurement of the production cross-section of ZZ has given: σ(pp → ZZ) equals (11.24 ± 3.18 (stat) ± 1.98 (syst) ± 0.67 (lumi)) pb for an energy of 7 TeV (in the center of mass frame). This value is consistent with Standard Model's theoretical predictions. Limiting values for the anomalous coupling constants f4Z and f5Z have been deduced for a confidence ratio of 95%: -0.080 4Z 5Z < 0.077. The existence of such couplings would be an indication of new physics beyond the Standard Model. Moreover, the ZZ process in the Standard Model is a background for Higgs searches and have to be well known. Some preliminary studies are performed on the CMS electromagnetic calorimeter. These studies are related to the selective readout system and to the laser monitoring system of the electromagnetic calorimeter. The measurement and the behaviour of the transverse missing energy are also studied in events containing one electroweak boson decaying into electron(s). This study shows that pileup has an important effect on missing transverse energy measurements. Some corrections have to be taken into account to deal with these effects. Conclusions from these analyses contribute to the good understanding of results obtained in the ZZ final states study

  17. CMS Statistics

    Data.gov (United States)

    U.S. Department of Health & Human Services — The CMS Center for Strategic Planning produces an annual CMS Statistics reference booklet that provides a quick reference for summary information about health...

  18. CMS Tier-2 resource management

    International Nuclear Information System (INIS)

    The Tier-2 centers in CMS are the only location, besides the specialized analysis facility at CERN, where users are able to obtain guaranteed access to CMS data samples. The Tier-1 centers are used primarily for organized processing and storage. The Tier-1s are specified with data export and network capacity to allow the Tier-2 centers to refresh the data in disk storage regularly for analysis. A nominal Tier-2 center will deploy 200 TeraBytes of storage for CMS. The CMS expectation for the global Tier-2 capacity is more than 5 PB of useable disk storage. In order to manage such a large and highly distributed resource CMS has tried to introduce policy and structure to the Tier-2 storage and processing. In this presentation I discuss the CMS policy for dividing resources between the local community, the individual users, CMS centrally, and focused CMS analysis groups. I focus on the technical challenges associated with management and accounting as well as the collaborative challenges of assigning resources to the whole community. The different challenges associated with partitioning dynamic resources like processing and more static resources like storage will be explored. I show the level of dynamic data placement and resource utilization achieved and the level of distribution CMS expects to achieve in the future

  19. Muon flux measurement with silicon detectors in the CERN neutrino beams

    International Nuclear Information System (INIS)

    The present work mainly describes the 'Neutrino Flux Monitoring' system (NFM), which has been built for the 400-GeV Super Proton Synchrotron (SPS) neutrino beams. A treatment is given of some general subjects related to the utilization of silicon detectors and the properties of high-energy muons. Energy loss of minimal-ionizing particles, which has to be distinguished from energy deposition in the detector, is considered. Secondary radiation, also called 'spray', consisting of 'delta rays' and other cascade products, is shown to play an important role in the muon flux measurement inside a shield, especially for muons of high energy (> 100 GeV). Radiation induced damage in the detectors, which determines the long term performance, is discussed. The relation between the detector response and the real muon flux is determined. The use of NFM system for on-line beam monitoring is described. (Auth.)

  20. CMS 2006 - CMS France days

    International Nuclear Information System (INIS)

    These CMS talks give the opportunity for all the teams working on the CMS (Compact Muon Spectrometer) project to present the status of their works and to exchange ideas. 5 sessions have been organized: 1) CMS status and perspectives, 2) contributions of the different laboratories, 3) software and computation, 4) physics with CMS (particularly the search for the Higgs boson), and 5) electronic needs. This document gathers the slides of the presentations

  1. CMS Observes Single Top-Quark

    CERN Multimedia

    2011-01-01

      One of the many excellent results harvested by CMS from 2010 data. (Figure shows events vs cosine of the angle between lepton and light jets in t rest-frame.)   If you have any comments / suggestions please contact the editors: Marzena Lapka (marzena.lapka@cern.ch) and Achintya Rao (achintya.rao@cern.ch)  

  2. CMS the art of science

    CERN Document Server

    Hoch, Michael; Denegri, Daniel; Preece, Stephen; Storr, Mick

    2016-01-01

    The physicist as artist: Michael Hoch photographed the extraordinary science cabinet of wonders CMS (the Compact Muon Solenoid Experiment) at CERN. With a foreword by François Englert, 2013 Nobel Laureate in Physics and co-discoverer of the Higgs boson.

  3. Transport of the Hadronic Forward (HF) calorimeter from building 186 (CERN Meyrin site) to the CMS construction hall at point 5, Cessy, France.

    CERN Multimedia

    Florelle Antoine

    2006-01-01

    The two halves of the Forward Hadronic Calorimeter (HF) were transported from the CERN Meyrin site to the surface assembly hall at LHC Point 5 in Cessy, France, during the first part of July. Transporting these 300 tonne objects involved the construction around them of a 65-metre long trailer, simultaneously pushed and pulled by two trucks at either end. The main road between St. Genis and Cessy was closed during these operations and a police escort was provided for the ~5 hour journeys. The two HF halves will be the first major elements to be lowered by the gantry crane into the underground experimental cavern around the end of July or beginning of August.

  4. Member State Event: Telling CERN's story !

    CERN Multimedia

    2004-01-01

    As part of the events to mark the Laboratory's fiftieth anniversary, members of the CERN personnel are telling the story of CERN. Robert Cailliau (on the right), currently responsible for CERN's external communications, and Chiara Mariotti (in the center), a physicist working at CMS, were invited to talk about the history of CERN and the Web at a conference in the 'Science Thursdays' series entitled 'From the Quark to the Web' in Turin on 26 February.

  5. Performance studies for the new CMS Outer Tracker module concept at HL-LHC based on measurements of charge collection properties in irradiated silicon sensors

    Energy Technology Data Exchange (ETDEWEB)

    Nürnberg, Andreas, E-mail: andreas.nuernberg@kit.edu

    2015-10-01

    In order to increase the discovery potential of the experiments at the Large Hadron Collider, the high-luminosity phase of the LHC (HL-LHC) is expected to deliver a total of 3000 fb{sup −1} integrated luminosity. The instantaneous luminosity will be increased by a factor of five compared to the LHC design luminosity. This results in an intensified track density and radiation level especially in the tracking systems, requiring new radiation hard silicon sensors for the CMS Outer Tracker. To cope with the increased track density and trigger rates, a new module concept based on the coincidence of hits in two closely stacked sensors is pursued for the new tracker, allowing the use of tracking and transverse momentum information already at the first trigger level. The performance of the new trigger module concept has been studied using a parametrization of the charge drift in the electric and magnetic field in the sensor. From that, the phase-space of efficient operation for this module concept and the binary readout in terms of collected charge and noise has been explored. - Highlights: • A module concept for the use in the upgraded CMS tracker at the HL-LHC is investigated. • The module provides track momentum information to the first trigger level of CMS. • p{sub T}-information is obtained by correlation of hits in two closely stacked sensors. • The performance is studied using a parametrization of the sensor response. • The possible phase-space of noise and clustering threshold is evaluated.

  6. Data acquisition software for the CMS strip tracker

    CERN Document Server

    Bainbridge, R; Bel, S; Cole, J; Cripps, N; Delaere, C; Jesus, A C A; Drouhin, F; Fulcher, J; Giassi, A; Gill, K; Giordano, D; Gross, L; Hahn, K; Mersi, S; Mirabito, L; Nikolic, M; Radicci, V; Tkaczyk, S; Wingham, M

    2008-01-01

    The CMS silicon strip tracker, providing a sensitive area of approximately 200 m2 and comprising 10 million readout channels, has recently been completed at the tracker integration facility at CERN. The strip tracker community is currently working to develop and integrate the online and offline software frameworks, known as XDAQ and CMSSW respectively, for the purposes of data acquisition and detector commissioning and monitoring. Recent developments have seen the integration of many new services and tools within the online data acquisition system, such as event building, online distributed analysis, an online monitoring framework, and data storage management. We review the various software components that comprise the strip tracker data acquisition system, the software architectures used for stand-alone and global data-taking modes. Our experiences in commissioning and operating one of the largest ever silicon micro-strip tracking systems are also reviewed.

  7. Star spotting at CERN

    CERN Multimedia

    2008-01-01

    This June, two American celebrities (and physics enthusiasts!) came to CERN. Brian Cox gave Mike Einziger (right), lead guitarist with the rock band Incubus, the star treatment in the ATLAS cavern. Jesse Dylan embraces the spirit of ATLAS! Mike Einziger, lead guitarist with the rock band Incubus, visited CERN on Friday 13 June between concerts in Finland and England. Einziger, a lifelong science enthusiast descended into the ATLAS and CMS caverns and visited the SM18 test magnet facility during his brief tour of CERN. Einziger learned about the LHC through watching online lectures from University of Manchester and ATLAS physicist Brian Cox, and was thrilled to have the chance to see the detectors in person. The musician has created an orchestral piece, inspired in part by the work being done at CERN for the LHC, which will have its debut in Los Angeles on 23 August. Just over a week earlier, Jesse Dylan, Hollywood film director a...

  8. Iran approaches CERN

    CERN Multimedia

    2002-01-01

    Members of Parliament from the Islamic Republic of Iran visit SM18. From left to right : Ali Mojtahed-Shabestari, Deputy Ambassador of the Islamic Republic of Iran in Geneva, Diether Blechschmidt, from CERN, Abdol-Rahim Baharvand and Hossain Amiri, from the Iranian Parliament, Norbert Siegel, from CERN, Hossain Afarideh, Rasool Seddighi and Ahmad Shirzad from the Iranian Parliament. Five members of the Parliament of the Islamic Republic of Iran visited CERN for three days at the beginning of May. All of them have PhD's in Physics, as well as holding their job in politics. They are involved in legislation for science, research and education funding in Iran. Apart from their interest in CERN in general, they were especially attracted to the CMS detector, since an Iranian contribution to the LHC is now starting through a collaboration with the Institute for Studies in Theoretical Physics and Mathematics in Tehran.

  9. The silicon sensors for the Compact Muon Solenoid tracker—design and qualification procedure

    Science.gov (United States)

    Agram, J.-L.; Angarano, M. M.; Assouak, S.; Bergauer, T.; Bilei, G. M.; Borrello, L.; Brianzi, M.; Civinini, C.; Dierlamm, A.; Dinu, N.; Demaria, N.; Feld, L.; Focardi, E.; Fontaine, J.-C.; Forton, E.; Furgeri, A.; Gregoire, Gh.; Hartmann, F.; Honma, A.; Juillot, P.; Kartashov, D.; Krammer, M.; Macchiolo, A.; Mannelli, M.; Messineo, A.; Migliore, E.; Militaru, O.; Piasecki, C.; Santinelli, R.; Sentenac, D.; Servoli, L.; Starodumov, A.; Tonelli, G.; Wang, J.

    2004-01-01

    The Compact Muon Solenoid (CMS) is one of the experiments at the Large Hadron Collider (LHC) under construction at CERN. Its inner tracking system consist of the world largest Silicon Strip Tracker (SST). In total it implements 24,244 silicon sensors covering an area of 206 m2. To construct a large system of this size and ensure its functionality for the full lifetime of 10 years under LHC condition, the CMS collaboration developed an elaborate design and a detailed quality assurance program. This paper describes the strategy and shows first results on sensor qualification.

  10. The Silicon Sensors for the Compact Muon Solenoid Tracker - Design and Qualification Procedure

    CERN Document Server

    Agram, Jean-Laurent; Assouak, Samia; Bergauer T.; Bilei, Gian Mario; Borrello, Laura; Brianzi, Mirko; Civinini, Carlo; Dierlamm, Alexander; Dinu, Nicoleta; Demaria, Natale; Feld, Lutz; Focardi, Ettore; Fontaine, Jean-Charles; Forton, Eric; Furgeri, Alexander; Hartmann, Frank; Honma, Alan; Juillot, Pierre; Kartashov, Dmitry; Krammer, Manfred; Macchiolo, Anna; Mannelli, Marcello; Messineo, Alberto; Migliore, Ernesto; Militaru, Otilia; Piasecki, Christian; Santinelli, Roberto; Sentenac, Daniel; Servoli, Leonello; Starodumov, Andrei; Tonelli, Guido; Wang, Jason

    2003-01-01

    The Compact Muon Solenoid (CMS) is one of the experiments at the Large Hadron Collider (LHC) under construction at CERN. Its inner tracking system consist of the world largest Silicon Strip Tracker (SST). In total it implements 24244 silicon sensors covering an area of 206 m^2. To construct a large system of this size and ensure its functionality for the full lifetime of ten years under LHC condition, the CMS collaboration developed an elaborate design and a detailed quality assurance program. This paper describes the strategy and shows first results on sensor qualification.

  11. CMS Centres Worldwide a New Collaborative Infrastructure

    CERN Document Server

    Taylor, Lucas

    2009-01-01

    The CMS Experiment at the LHC is establishing a global network of inter-connected "CMS Centres" for controls, operations and monitoring. These support: (1) CMS data quality monitoring, detector calibrations, and analysis; and (2) computing operations for the processing, storage and distribution of CMS data. We describe the infrastructure, computing, software, and communications systems required to create an effective and affordable CMS Centre. We present our highly successful operations experiences with the major CMS Centres at CERN, Fermilab, and DESY during the LHC first beam data-taking and cosmic ray commissioning work. The status of the various centres already operating or under construction in Asia, Europe, Russia, South America, and the USA is also described. We emphasise the collaborative communications aspects. For example, virtual co-location of experts in CMS Centres Worldwide is achieved using high-quality permanently-running "telepresence" video links. Generic Web-based tools have been developed ...

  12. CMS Statistics

    Data.gov (United States)

    U.S. Department of Health & Human Services — This reference provides significant summary information about health expenditures and the Centers for Medicare & Medicaid Services' (CMS) programs. The...

  13. Prime Minister of Pakistan visits CERN

    CERN Multimedia

    Anaïs Schaeffer

    2016-01-01

    On Saturday, 23 January 2016, CERN welcomed Mr Muhammad Nawaz Sharif, Prime Minister of Pakistan.   From left to right: Minister of Finance Mr Mohammad Ishaq Dar, Prime Minister of the Islamic Republic of Pakistan, Muhammad Nawaz Sharif, CERN Director-General Fabiola Gianotti and CMS national contact physicist Hafeez Hoorani. Mr Muhammad Nawaz Sharif arrived at Point 5 in Cessy, where he was welcomed onto French soil by the sous-préfet of Cessy, Stéphane Donnot, and, representing CERN, Director-General Fabiola Gianotti, Directors Eckhard Elsen and Charlotte Warakaulle, and Rüdiger Voss, the adviser for relations with Pakistan. It was the first visit by a head of government of Pakistan since the country became CERN's latest Associate Member State in July 2015. The Prime Minister then had the opportunity to visit the CMS underground experimental area accompanied by the CMS Spokesperson, Tiziano Camporesi, and the CMS collaboration’...

  14. New Management for CMS

    CERN Multimedia

    CERN Bulletin

    2010-01-01

    As of January 2010, Guido Tonelli becomes the new CMS Spokesperson with a two-year term of office. A Professor of General Physics at the University of Pisa, Italy, and a CERN Staff Member since January 2010, Tonelli had already been appointed as Deputy Spokesperson under the previous management. He has taken over from Jim Virdee, who was CMS Spokesperson from January 2007 to December 2009. Guido Tonelli, new CMS spokesperson At the same time as Tonelli becomes Spokesperson, two new Deputies, Albert De Roeck and Joe Incandela, as well as a whole new set of Coordinators, are also starting their terms of office. ”With the first data-taking run we have shown that CMS is an excellent experiment. The next challenge will be to transform CMS into a discovery machine with a view to making it synonymous with scientific excellence. This will be very tough but, again, the winning element will be the focus and coherent effort of the whole collaboration. On my side I'll do my best but I will need...

  15. Recent results from CMS

    Directory of Open Access Journals (Sweden)

    Schöfbeck Robert

    2015-01-01

    Full Text Available The CMS experiment at the Large Hadron Collider at CERN collected a dataset of 19.5fb−1 during 8 TeV proton-proton operation. A large number of groundbreaking results were obtained from the analysis of this dataset, among them the discovery of the Higgs boson and precision measurements of important Standard Model parameters, for example the mass of the top quark. Subtle processes like the production of a Z boson by fusion of two W bosons have been measured for the first time. Moreover, many searches for physics beyond the Standard model have been carried out, both in the context of supersymmetry and beyond, which often provide tight constraints in model parameter space. This brief summary is a a short overview of the most important recent CMS results at 7 and 8 TeV.

  16. 25th May 2011 - Egyptian Minister for Scientific Research, Science and Technology A. Ezzat Salama signing the guest book with CERN Director-General R. Heuer and visiting CMS control centre with Collaboration Spokesperson G. Tonelli.

    CERN Multimedia

    Maximilien Brice

    2011-01-01

    He visited the CMS control room on the Meyrin site with, from left, CMS spokesperson, Guido Tonelli, Alaa Awad, Fayum University, Hisham Badr, ambassador at the UN Geneva, and Maged Elsherbiny, president of the Scientific Research Academy.

  17. Recent CMS Results

    OpenAIRE

    Dorigo, Tommaso

    2012-01-01

    The CMS experiment obtained a large number of groundbreaking results from the analysis of 7- and 8-TeV proton-proton collisions produced so far by the Large Hadron Collider at CERN. In this brief summary only a sample of those results will be discussed. A new particle with mass m(H) = 125.3 +- 0.4(stat.) +- 0.5(syst.) GeV and characteristics compatible with those expected for a standard model Higgs boson has been observed in its decays to photon pairs, WW pairs, and ZZ pairs. Searches for the...

  18. Design and development of a vertex reconstruction for the CMS (Compact Muon Solenoid) data. Study of gaseous and silicon micro-strips detectors (MSGC); Conception d'un algorithme de reconstruction de vertex pour les donnees de CMS. Etude de detecteurs gazeux (MSGC) et silicium a micropistes

    Energy Technology Data Exchange (ETDEWEB)

    Moreau, St

    2002-12-01

    The work presented in this thesis has contributed to the development of the Compact Muon Solenoid detector (CMS) that will be installed at the future Large Hadron Collider (LHC) which will start running in summer 2007. This report is organised in three parts: the study of gaseous detectors and silicon micro-strips detectors, and a development of a software for the reconstruction and analysis of CMS data in the framework of ORCA. First, the micro-strips gaseous detectors (MSGC) study was on the ultimate critical irradiation test before their substitution in the CMS tracker. This test showed a really small number of lost anodes and a stable signal to noise ratio. This test proved that the described MSGC fulfill all the requirements to be integrated in the CMS tracker. The following contribution described a study of silicon micro-strips detectors and its electronics exposed to a 40 MHz bunched LHC like beam. These tests indicated a good behaviour of the data acquisition and control system. The signal to noise ratio, the bunch crossing identification and the cluster finding efficiency had also be analysed. The last study concern the design and the development of an ORCA algorithm dedicates to secondary vertex reconstruction. This iterative algorithm aims to be use for b tagging. This part analyse also primary vertex reconstruction in events without and with pile up. (author)

  19. 15 janiver 2014 - A. Manoha, Présidente du Tribunal de Grande Instance de Bourg-en-Bresse en France, visite le tunnel du LHC au Point 5 avec R. Garoby, Chef adjoint du département Faisceaux; visite la caverne de l'expérience CMS avec D. Contardo, Chef du projet CMS Upgrade et signe le livre d'or avec R. Garoby. F. Eder, Délégué aux relations avec les Etats-hôtes du CERN présent.

    CERN Multimedia

    Pantelia, Anna

    2014-01-01

    15 janiver 2014 - A. Manoha, Présidente du Tribunal de Grande Instance de Bourg-en-Bresse en France, visite le tunnel du LHC au Point 5 avec R. Garoby, Chef adjoint du département Faisceaux; visite la caverne de l'expérience CMS avec D. Contardo, Chef du projet CMS Upgrade et signe le livre d'or avec R. Garoby. F. Eder, Délégué aux relations avec les Etats-hôtes du CERN présent.

  20. Guinness World Records: Presenting certificates to CERN

    CERN Multimedia

    Rao, Achintya

    2014-01-01

    The latest edition of the Guinness Book of World Records features CERN, crediting the CMS and ATLAS collaborations for the first observation of a Higgs boson. On 20 August, representatives of Guinness World Records visit CERN to hand over certificates for the record.

  1. CMS delegation for MTB55 held at Tata Institute in Mumbai (Bombay) during CMS week 14 December 2000.

    CERN Multimedia

    A. Payn

    2000-01-01

    CMS delegation at MTB55 in Tata Institue Mumbai on 14 December 2000. From left to right Bertrand Blau/ETHZ, Stefania Farinon/INFN-Genova, Alain Hervé/CERN, Lucien Veillet/CERN, Jean-Paul Grillet/CERN, Yves Pabot/Saclay, Bruno Levesy/Saclay, Alain Payn/Saclay, François Kircher/Saclay, Benoît Curé/CERN.

  2. CERN In Focus

    CERN Multimedia

    CERN audiovisual service

    2008-01-01

    First edition 2008 of Cern in Focus. On behalf of the audiovisual team, a selection of the latest videos filmed at CERN. Every six weeks, we will bring you the latest in CERN's activities, from LHC start up to the Computing Grid, featuring the experiments and many other goings-on at CERN. The agenda of this first edition of CERN in Focus features the visit of the prime minister of Malta, Lawrence Gonzi... CMS and the final descent of the YE-1 end cap... The departure of UA1 magnets to Japan... The start up of sectors 4 and 5... And finally, in our sports round up... We'll talk about football. New in brief this month... The final bolt is in place : On 7th November, in the bowels of the LHC tunnel, CERN's Director General Robert Aymar tightened a gold-plated bolt for the last arc interconnection of sector 1-2. This symbolic gesture marks the completion of all the arc interconnections of the LHC. Last welding work: it was never going to be an easy task. On this day last year just one sector had been completed,...

  3. CMS AWARDS

    CERN Multimedia

    Steven Lowette

    Working under great time pressure towards a common goal in gradual steps can sometimes cause us to forget to take a step back, and celebrate what marvels have been achieved. A general need was felt within CMS to expand the recognition for our young scientists that made outstanding, well recognized and creative contributions to CMS, which served to significantly advance the performance of CMS as a complete and powerful experiment. Therefore, the Collaboration Board endorsed in March 2009 a proposal from the CB Chair and Advisory Group to award each year the newly created "CMS Achievement Award" to fourteen graduate students and postdocs that made exceptional contributions to the Tracker, ECAL, HCAL and Muon subdetectors as well as the TriDAS project, the Commissioning of CMS and the Offline Software and Computing projects. It was also agreed that there was a need to go back in time, and retroactively attribute awards for the years 2007 and 2008 when CMS went from a bare cavern to a detect...

  4. The CMS conductor

    CERN Document Server

    Horváth, I L; Marti, H P; Neuenschwander, J; Smith, R P; Fabbricatore, P; Musenich, R; Calvo, A; Campi, D; Curé, B; Desirelli, Alberto; Favre, G; Riboni, P L; Sgobba, Stefano; Tardy, T; Sequeira-Lopes-Tavares, S

    2000-01-01

    The Compact Muon Solenoid (CMS) is one of the experiments, which are being designed in the framework of the Large Hadron Collider (LHC) project at CERN, the design field of the CMS magnet is 4 T, the magnetic length is 13 m and the aperture is 6 m. This high magnetic field is achieved by means of a 4 layer, 5 modules superconducting coil. The coil is wound from an Al-stabilized Rutherford type conductor. The nominal current of the magnet is 20 kA at 4.5 K. In the CMS coil the structural function is ensured, unlike in other existing Al-stabilized thin solenoids, both by the Al-alloy reinforced conductor and the external former. In this paper the retained manufacturing process of the 50-km long reinforced conductor is described. In general the Rutherford type cable is surrounded by high purity aluminium in a continuous co-extrusion process to produce the Insert. Thereafter the reinforcement is joined by Electron Beam Welding to the pure Al of the insert, before being machined to the final dimensions. During the...

  5. Higgs Results from CMS

    Science.gov (United States)

    Bornheim, Adolf

    2014-03-01

    The Nobel Prize in physics 2013 has been awarded to François Englert and Peter W. Higgs for the theoretical discovery of a mechanism that contributes to our understanding of the origin of mass of subatomic particles which plays a crucial role in our understanding of electro-weak symmetry breaking. I will review the experimental results manifesting the discovery of the so called Higgs boson from the perspective of the Compact Muon Solenoid (CMS) collaboration. The review is based on the final results from the proton-proton collision data at 7 TeV and 8 TeV center-of-mass energy, collected in 2011 and 2012 in the initial run of the Large Hadron Collider (LHC) at the European Organization for Nuclear Research (CERN). Results on the properties of the new particle with a mass around 125 GeV, all in agreement with the expectations for the Standard Model (SM) Higgs boson, are highlighted. Latest results on the couplings between the Higgs and fermionic fields, in particular the final results of searches for a Higgs boson decaying into a b-quark or a tau-lepton pair, are presented. Non-SM Higgs searches are briefly summarized. Future perspectives for Higgs physics with CMS at LHC for the next data taking period starting in 2015 and beyond are discussed. CMS Collaboration.

  6. Construction and Calibration of the Laser Alignment System for the CMS Tracker

    CERN Document Server

    Adolphi, Roman

    2006-01-01

    The CMS detector (Compact Muon Solenoid) is under construction at one of the four proton-proton interaction points of the LHC (Large Hadron Collider) at CERN, the European Organization for Nuclear Research (Geneva, Switzerland). The inner tracking system of the CMS experiment consisting of silicon detectors will have a diameter of 2.4 m and a length of 5.4 m representing the largest silicon tracker ever. About 15000 silicon strip modules create an active silicon area of 200 m2 to detect charged particles from proton collisions. They are placed on a rigid carbon fibre structure, providing stability within the working conditions of a 4 T solenoid magnetic field at −10oC. Knowledge of the position of the silicon detectors at the level of 100 μm is needed for an efficient pattern recognition of charged particle tracks. Metrology methods are used to survey tracker subdetectors and the integrated Laser Alignment System (LAS) provides absolute positioning of support structure elements to better than 100 μm. Rela...

  7. Beam tests of lead tungstate crystal matrices and a silicon strip preshower detector for the CMS electromagnetic calorimeter

    CERN Document Server

    Auffray, Etiennette; Barney, D; Bassompierre, Gabriel; Benhammou, Ya; Blick, A M; Bloch, P; Bonamy, P; Bourotte, J; Buiron, L; Cavallari, F; Chipaux, Rémi; Cockerill, D J A; Dafinei, I; Davies, G; Depasse, P; Deiters, K; Diemoz, M; Dobrzynski, Ludwik; Donskov, S V; Mamouni, H E; Ercoli, C; Faure, J L; Felcini, Marta; Gautheron, F; Géléoc, M; Givernaud, Alain; Gninenko, S N; Godinovic, N; Graham, D J; Guillaud, J P; Guschin, E; Haguenauer, Maurice; Hillemanns, H; Hofer, H; Ille, B; Inyakin, A V; Jääskeläinen, S; Katchanov, V A; Kirn, T; Kloukinas, Kostas C; Korzhik, M V; Lassila-Perini, K M; Lebrun, P; Lecoq, P; Lecoeur, Gérard; Lecomte, P; Leonardi, E; Locci, E; Loos, R; Longo, E; MacKay, C K; Martin, E; Mendiburu, J P; Musienko, Yu V; Nédélec, P; Nessi-Tedaldi, F; Organtini, G; Paoletti, S; Pansart, J P; Peigneux, J P; Puljak, I; Qian, S; Reid, E; Renker, D; Rosowsky, A; Rosso, E; Rusack, R W; Rykaczewski, H; Schneegans, M; Seez, Christopher J; Semeniouk, I N; Shagin, P M; Sillou, D; Singovsky, A V; Sougonyaev, V; Soric, I; Verrecchia, P; Vialle, J P; Virdee, Tejinder S; Zhu, R Y

    1998-01-01

    Tests of lead tungstate crystal matrices carried out in high-energy electron beams in 1996, using new crystals, new APDs and an improved test set-up, confirm that an energy resolution of better than 0 .6% at 100 GeV can be obtained when the longitudinal uniformity of the struck crystal is adequate. Light loss measurements under low dose irradiation are reported. It is shown that there is no loss of energy resolution after irradiation and that the calibration change due to light loss can be tracked with a precision monitoring system. Finally, successuful tests with a preshower device, equipped wi th silicon strip detector readout, are described.

  8. Search for supersymmetry with the CMS experiment

    International Nuclear Information System (INIS)

    Full text: The CMS experiment at the Large Hadron Collider at CERN is preparing for the first proton-proton collision data, expected for the end of 2009. One of the primary topics will be the search for supersymmetry, one of the best studied candidates for physics beyond the standard model. The talk will give an overview of the search strategies developed in CMS with an emphasis on topologies containing jets, leptons and missing energy. (author)

  9. 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.

  10. Calibration of the CMS Pixel Detector at the Large Hadron Collider

    CERN Document Server

    Vami, Tamas Almos

    2015-01-01

    The Compact Muon Solenoid (CMS) detector is one of two general-purpose detectors that reconstruct the products of high energy particle interactions at the Large Hadron Collider (LHC) at CERN. The silicon pixel detector is the innermost component of the CMS tracking system. It determines the trajectories of charged particles originating from the interaction region in three points with high resolution enabling precise momentum and impact parameter measurements in the tracker. The pixel detector is exposed to intense ionizing radiation generated by particle collisions in the LHC. This irradiation could result in temporary or permanent malfunctions of the sensors and could decrease the efficiency of the detector. We have developed procedures in order to correct for these effects. In this paper, we present the types of malfunctions and the offline calibration procedures. We will also show the efficiency and the resolution of the detector in 2012.

  11. UN Secretary General visits CERN

    CERN Multimedia

    2008-01-01

    UN Secretary General praises CERN in recent visit. Ban Ki-moon, Robert Aymar, CERN Director-General, and Sergei Ordzhonikidze, Director-General of the United Nations Office in Geneva at the CMS site.On Sunday 31 August, Ban Ki-moon, the UN Secretary General, made an important visit to CERN. Arriving in the late afternoon, he was warmly greeted at Point 5 by Robert Aymar, the Director-General, and the Sous-préfet of Gex, Olivier Laurens-Bernard. Accompanied by a UN delegation, Ban Ki-moon was also introduced to Jos Engelen, the Chief Scientific Officer, and Jim Virdee, the CMS spokesperson. He then took the opportunity to visit CMS and the machine tunnel. At the end of his short trip, Ban Ki-moon signed the Guest Book in the tradition of important dignitaries visiting CERN. Expressing his admiration for CERN’s spirit of collaboration, Ban Ki-moon said, "I am very honored to visit CERN, an invaluable scientific institution a...

  12. Distributed Data Transfers in CMS

    CERN Document Server

    Rossman, Paul

    2011-01-01

    The multi-tiered computing infrastructure of the CMS experiment at the LHC depends on the reliable and fast transfer of data between the different CMS computing sites. Data have to be transferred from the Tier-0 to the Tier-1 sites for archival in a timely manner to avoid overflowing disk buffers at CERN. Data have to be transferred in bursts to all Tier- 2 level sites for analysis as well as synchronized between the different Tier-1 sites. The data transfer system is the key ingredient which enables the optimal usage of all distributed resources. The operation of the transfer system consists of monitoring and debugging of transfer issues to guarantee a timely delivery of data to all corners of the CMS computing infrastructure. Further task of transfer operation is to guarantee the consistency of the data at all sites, both on disk and on tape. Procedures to verify the consistency and to debug and repair problems will be discussed.

  13. Tracking and Alignment in the CMS detector

    CERN Document Server

    Ronga, Frederic Jean

    2007-01-01

    This Report summarises the alignment strategy of the CMS detector. Track reconstruction in the silicon tracker and muon chambers is briefly described. We then present the different sources of alignment information, in particular alignment algorithms using reconstructed tracks.

  14. Commissioning of the CMS Magnet

    CERN Document Server

    Campi, D; Gaddi, A; Gerwig, H; Hervé, A; Klyukhin, V; Maire, G; Perinic, G; Brédy, P; Fazilleau, P; Kircher, F; Levésy, B; Fabbricatore, P; Farinon, S; Greco, M

    2007-01-01

    CMS (Compact Muon Solenoid) is one of the large experiments for the LHC at CERN. The superconducting magnet for CMS has been designed to reach a 4 T field in a free bore of 6 m diameter and 12.5 m length with a stored energy of 2.6 GJ at full current. The flux is returned through a 10 000 t yoke comprising of five wheels and two end caps composed of three disks each. The magnet was designed to be assembled and tested in a surface hall, prior to be lowered at 90 m below ground, to its final position in the experimental cavern. The distinctive feature of the cold mass is the four-layer winding, made from a reinforced and stabilized NbTi conductor. The design and construction was carried out by CMS participating institutes through technical and contractual endeavors. Among them CEA Saclay, INFN Genova, ETH Zurich, Fermilab, ITEP Moscow, University of Wisconsin and CERN. The construction of the CMS Magnet, and of the coil in particular, has been completed last year. The magnet has just been powered to full field ...

  15. CMS launches new educational tools

    CERN Multimedia

    Corinne Pralavorio

    2014-01-01

    On 5 and 11 November, almost 90 pupils from the Fermi scientific high school in Livorno, Italy, took part in two Masterclass sessions organised by CMS.   CMS Masterclass participants.  The pupils took over a hall at CERN for an afternoon to test a new software tool called CIMA (CMS Instrument for Masterclass Analysis) for the first time. The software simplifies the process of recording results and reduces the number of steps required to enter data. During the exercise, each group of pupils had to analyse about a hundred events from the LHC. For each event, the budding physicists determined whether what they saw was a candidate W boson, Z boson or Higgs boson, identified the decay mode and entered key data. At the end of the analysis, they used the results to reconstruct a mass diagram. CIMA was developed by a team of scientists from the University of Aachen, Germany, the University of Notre-Dame, United States, and CERN. CMS has also added yet another educational tool to its already l...

  16. A Finnish delegation visits CERN

    CERN Multimedia

    2001-01-01

    Minister Maija Rask (front, centre) led a Finnish delegation on a visit to CERN last week. Here the delegation inspects CMS preparations with the collaboration's spokesman Michel Della Negra (front, left). On 19 February Finnish Minister of Education, Mrs Maija Rask, visited CERN. She led a delegation composed of Mr. Pekka Huttaniemi, Permanent Representative of Finland to the United Nations, Mrs Pirjo Välinoro, Ministerial Counsellor (Economic affairs), Mr Markku Linna, Director General of the Ministry of Education, and Mr Tapio Kosunen, Special Adviser at the Ministry. Accompanied by Director General Luciano Maiani, the delegation visited CMS experiment and the LHC superconducting magnet test hall, and met Finnish students and scientists at CERN.

  17. Egypt receives computers from CERN

    CERN Multimedia

    Anaïs Schaeffer

    2013-01-01

    On Tuesday 22 October, CERN officially celebrated sending IT equipment to Egypt, the fifth country to benefit from such donations after Morocco, Ghana, Bulgaria and Serbia. Although no longer adequate for CERN's cutting-edge research, these machines are still suitable for less demanding applications.   Rolf Heuer and Amr Radi, during the official ceremony. In a ceremony to mark the occasion, Rolf Heuer, CERN Director-General, and Egyptian physicist Amr Radi, team leader of ASRT (Egypt’s Academy of Scientific Research and Technology) within the CMS collaboration, who has played a major part in the operation, expressed their enthusiasm for the project. A total of 196 servers and 10 routers will be installed on the ASRT premises in Cairo, where they will be used to analyse data from the ALICE and CMS experiments. For more information about CERN’s donations of IT equipment, see this Bulletin article.

  18. A Level-1 Tracking Trigger for the CMS upgrade using stacked silicon strip detectors and advanced pattern technologies

    Science.gov (United States)

    Boudoul, G.

    2013-01-01

    Experience at high luminosity hadrons collider experiments shows that tracking information enhances the trigger rejection capabilities while retaining high efficiency for interesting physics events. The design of a tracking based trigger for the High Luminosity LHC (HL-LHC) is an extremely challenging task, and requires the identification of high-momentum particle tracks as a part of the Level 1 Trigger. Simulation studies show that this can be achieved by correlating hits on two closely spaced silicon strip sensors, and reconstructing tracks at L1 by employing an Associative Memory approach. The progresses on the design and development of this micro-strip stacked prototype modules and the performance of few prototype detectors will be presented. Preliminary results of a simulated tracker layout equipped with stacked modules are discussed in terms of pT resolution and triggering capabilities. Finally, a discussion on the L1 architecture will be given.

  19. The CMS Muon Reconstruction Software

    CERN Document Server

    Trocino, Daniele

    2009-01-01

    Muonic final states will provide clean signatures for many physics processes at the LHC. One of the main goals of the Compact Muon Solenoid (CMS) design is thus to ensure efficient and accurate identification and reconstruction of muons. A sophisticated muon system is used for muon identification and stand-alone reconstruction and the inner silicon tracker exploits the high magnetic field to ensure a very precise transverse momentum resolution. The global reconstruction algorithms combine muons reconstructed in the dedicated spectrometer with tracks reconstructed in the inner detector. The CMS reconstruction software is well suited for both offline reconstruction and online event selection (HLT) and its performance has been studied in detail using Monte Carlo simulations. The muon reconstruction has also been employed successfully to reconstruct cosmic muons traversing the CMS detector. The design of the CMS muon identification and reconstruction is presented, as well as its performance on simulated and cosmi...

  20. CERN celebrates its 60th anniversary with its neighbours

    CERN Multimedia

    CERN, Team

    2014-01-01

    CERN celebrates its 60th anniversary with its neighbours Caption: On 24 and 25 May, CERN invited its neighbours to visit three sites in celebration of the laboratory's 60th anniversary. More than 8000 people from the region visited the LHC tunnel at Point 4, the LHCb detector at Point 8 and the CMS detector at Point 5. There were also many aboveground activities on the CMS site at Cessy. "Le CERN fête ses 60 ans avec ses voisins" Les 24 et 25 mai, le CERN a ouvert les portes de 3 sites pour fêter ses 60 ans avec ses voisins. Plus de 8000 personnes visiteurs de la région sont venus rencontrer les scientifiques du CERN, visiter les expériences CMS et LHCb et le tunnel du LHC, et participer aux nombreuses activités sur le site de CMS à Cessy.

  1. CMS overview

    CERN Document Server

    Hong, Byungsik

    2015-01-01

    Most recent CMS data related to the high-density QCD are presented for pp and PbPb collisions at 2.76 TeV and pPb collisions at 5.02 TeV. The PbPb collision is essential to understand collective behavior and the final-state effects for the detailed characteristics of hot, dense partonic matter, whereas the pPb collision provides the critical information on the initial-state effects including the modification of the parton distribution function in cold nuclei. This paper highlights some of recent heavy-ion related results from CMS.

  2. Custom HPD readout for the CMS HCAL

    International Nuclear Information System (INIS)

    Over 10 000 channels from the CMS tile/fiber hadronic calorimeter (The CMS Hadron Calorimeter TDR, CERN/LHCC 97-31, June 20, 1997) will be read out by custom 19 and 73-channel HPD's in a 4 T field. Experimental constraints on the tube design have produced a faster tube with a larger active area and minimum accelerating gap. Quality assurance stations have been developed for fast processing of 600 tubes. Registration to 50 μm is done in situ, providing a custom collar with alignment pins which can be mated to a universal cookie. Lifetime measurements reveal details on aging, but operation is within CMS specifications

  3. The CMS Tracker Alignment Strategy

    CERN Document Server

    Weber, Martin

    2006-01-01

    CMS silicon Tracker alignment consists of three key components: Survey during tracker construction, measurements with the Laser Alignment System during operation and track based alignment. Methods and results are explained in detail, with a special focus on track based alignment due to its enormous complexity and numerical challenges.

  4. CMS tracker observes muons

    CERN Multimedia

    2006-01-01

    A computer image of a cosmic ray traversing the many layers of the TEC+ silicon sensors. The first cosmic muon tracks have been observed in one of the CMS tracker endcaps. On 14 March, a sector on one of the two large tracker endcaps underwent a cosmic muon run. Since then, thousands of tracks have been recorded. These data will be used not only to study the tracking, but also to exercise various track alignment algorithms The endcap tested, called the TEC+, is under construction at RWTH Aachen in Germany. The endcaps have a modular design, with silicon strip modules mounted onto wedge-shaped carbon fibre support plates, so-called petals. Up to 28 modules are arranged in radial rings on both sides of these plates. One eighth of an endcap is populated with 18 petals and called a sector. The next major step is a test of the first sector at CMS operating conditions, with the silicon modules at a temperature below -10°C. Afterwards, the remaining seven sectors have to be integrated. In autumn 2006, TEC+ wil...

  5. A new visitor centre for CMS

    CERN Multimedia

    2001-01-01

    At the inauguration of the new CMS visitor centre. The CMS experiment inaugurated a new visitor centre at its Cessy site on 14 June. This will allow the thousands of people who come to CERN each year to follow the construction of one the Laboratory's flagship experiments first-hand. CERN receives over 20,000 visitors each year. Until recently, many of them were taken on a guided tour of one of the LEP experiments. With the closure of LEP, however, trips underground are no longer possible, and the Visits' Service has put in place a number of other itineraries (Bulletin 46/2000). Since the CMS detector will be almost entirely constructed in a surface hall, it is now taking a big share of the limelight. The CMS visitor centre has been built on a platform overlooking CMS construction. It contains a set of clear descriptive posters describing the experiment, along with a video projection showing animations and movies about CMS construction. In the coming weeks, a display of CMS detector elements will be added, as...

  6. Last crystals for the CMS chandelier

    CERN Multimedia

    2008-01-01

    In March, the last crystals for CMS’s electromagnetic calorimeter arrived from Russia and China. Like dedicated jewellers crafting an immense chandelier, the CMS ECAL collaborators are working extremely hard to install all the crystals before the start-up of the LHC. One of the last CMS end-cap crystals, complete with identification bar code. Lead tungstate crystals mounted onto one section of the CMS ECAL end caps. Nearly 10 years after the first production crystal arrived at CERN in September 1998, the very last shipment has arrived. These final crystals will be used to complete the end-caps of the electromagnetic calorimeter (ECAL) at CMS. All in all, there are more than 75,000 crystals in the ECAL. The huge quantity of CMS lead tungstate crystals used in the ECAL corresponds to the highest volume ever produced for a single experiment. The excellent quality of the crystals, both in ter...

  7. 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

  8. 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).

  9. The muon chambers take centre stage at CMS

    CERN Multimedia

    2003-01-01

    The CMS muon chambers are now starting to arrive at CERN in significant numbers. All in all, the muon system of the CMS detector will comprise some 1400 of these chambers. Twenty percent of those for the endcaps have already been installed, while the assembly of those for the barrel will start in December.

  10. Martinus Justinus Godefriedus Veltman visits the CMS experiment

    CERN Multimedia

    Hoch, Michael

    2012-01-01

    Martinus Justinus Godefriedus Veltman is a Dutch theoretical physicist. He shared the 1999 Nobel Prize in physics with his former student Gerardus 't Hooft for their work on particle theory. He visited on the 18/09/2012 the CMS experiment at CERN / Cessy. He was guided in the experimental cavern by the CMS spokesperson Joe Incandela.

  11. Denis Guedj at CERN

    CERN Multimedia

    2009-01-01

    Denis Guedj (right), pictured with Etiennette Auffray Hillemanns of the CMS collaboration and Hartmut Hillemanns of the DG-KTT group.French author Denis Guedj, who is also a mathematician and Professor of History of Science at Paris VIII University, visited CERN on 7 and 8 October. During a presentation in the CERN Library he discussed his 15 published books and likened the process of novel writing to working on a scientific experiment: it begins with a limited amount of data, and then questions arise, problems are solved and further research reveals truths. Denis Guedj works hard to ensure that his novels contain ‘true fiction’. His most recent visit to CERN will help him to write a new book set at the LHC in which he will combine his scientific interest in what happens when a proton and proton collide with a human story about what happens to a male and female physicist who meet in the LHC tunnel. "Visiting the CMS cavern was...

  12. CMS Awards

    CERN Multimedia

    2004-01-01

    Ali Mohammad Rafiee receives the CMS Gold Award from Michel Della Negra of CMS. As part of the fifth annual CMS Awards, Iranian contractor HEPCO, located in Arak, an industrial town 200 km west of Tehran, received their Gold Award in a ceremony held on 14 June 2004 (the other award winners were reported in bulletin 13/2004). The Awards are given each year to a small number of the approximately one thousand contractors working on the CMS project. Gold Awards are given for outstanding technical achievement in work carried out for the detector. HEPCO received the Award for the excellent quality of their work in constructing two 25 tonne support tables, two 75 tonne shields (FCS) and eight supporting brackets to lower the HF into the cavern. Welds and machining obtained tolerances that were very difficult in structures of that size. Mr. A. M. Rafiee, the General Manager of the company, acknowledged the benefits of this collaboration, and thanked the efforts and skills of the many staff involved.

  13. CMS Detector Posters

    CERN Multimedia

    2016-01-01

    CMS Detector posters (produced in 2000): CMS installation CMS collaboration From the Big Bang to Stars LHC Magnetic Field Magnet System Trackering System Tracker Electronics Calorimetry Eletromagnetic Calorimeter Hadronic Calorimeter Muon System Muon Detectors Trigger and data aquisition (DAQ) ECAL posters (produced in 2010, FR & EN): CMS ECAL CMS ECAL-Supermodule cooling and mechatronics CMS ECAL-Supermodule assembly

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

    CERN Multimedia

    Marinov, Andrey; Strom, Derek Axel

    2015-01-01

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

  15. Performance test of the CMS link alignment system

    CERN Document Server

    Arce, P; Calvo, E; Fernández, M G; Ferrando, A; Figueroa, C F; García, N; Josa-Mutuberria, I; Molinero, A; Oller, J C; Rodrigo, T; Vila, I; Virto, A L

    2002-01-01

    A first global test of the CMS Alignment System was performed at the I4 hall of the CERN ISR tunnel. Positions of the network, reproducing a set of points in the CMS detector monitored by the Link System, were reconstructed and compared to survey measurements. Spatial and angular reconstruction precisions reached in the present experimental set-up are already close to the CMS requirements.

  16. 10 September 2013 - Italian Minister for Economic Development F. Zanonato visiting the ATLAS cavern with Collaboration Spokesperson D. Charlton and Italian scientists F. Gianotti and A. Di Ciaccio; signing the guest book with CERN Director-General R. Heuer and Director for Research and Scientific Computing S. Bertolucci; in the LHC tunnel with S. Bertolucci, Technology Deputy Department Head L. Rossi and Engineering Department Head R. Saban; visiting CMS cavern with Scientists G. Rolandi and P. Checchia.

    CERN Multimedia

    Jean-Claude Gadmer

    2013-01-01

    10 September 2013 - Italian Minister for Economic Development F. Zanonato visiting the ATLAS cavern with Collaboration Spokesperson D. Charlton and Italian scientists F. Gianotti and A. Di Ciaccio; signing the guest book with CERN Director-General R. Heuer and Director for Research and Scientific Computing S. Bertolucci; in the LHC tunnel with S. Bertolucci, Technology Deputy Department Head L. Rossi and Engineering Department Head R. Saban; visiting CMS cavern with Scientists G. Rolandi and P. Checchia.

  17. 26 April 2012 - Extraordinary and plenipotentiary Ambassador A. Dékány, Permanent Representative of the Republic of Hungary to the United Nations Office and other international organisations at Geneva, signing the guest book with CERN Director-General R. Heuer; visiting the LHC tunnel at Point 5 and CMS experimental area and surface building with Collaboration Deputy Spokespersom T. Camporesi; accompanied by M. Bajko, Technology Department. International Relations Office Adviser R. Voss also present.

    CERN Multimedia

    Jean-claude Gadmer

    2012-01-01

    26 April 2012 - Extraordinary and plenipotentiary Ambassador A. Dékány, Permanent Representative of the Republic of Hungary to the United Nations Office and other international organisations at Geneva, signing the guest book with CERN Director-General R. Heuer; visiting the LHC tunnel at Point 5 and CMS experimental area and surface building with Collaboration Deputy Spokespersom T. Camporesi; accompanied by M. Bajko, Technology Department. International Relations Office Adviser R. Voss also present.

  18. 24 February 2012 - Portuguese Minister for Education and Science N. Crato visiting the LHC superconducting magnet test hall with technology Department Head F. Bordry and signing the guest book with CERN Director-General R. Heuer. The Minister is accompanied by Secretary of State for Science L. Parreira and LIP Director J.M. Gago. A. Henriques(ATLAS), C. Lourenço (CMS) and Adviser R. Voss accompany the delegation throughout.

    CERN Multimedia

    Maximilien Brice

    2012-01-01

    On 24 February Nuno Crato, the Portuguese minister for education and science, left, toured the LHC superconducting-magnet test hall accompanied by Frédérick Bordry, CERN’s technology department head. He also took the opportunity to visit the underground experimental areas of ATLAS and CMS, and heard about the LHC Computing Grid Project before meeting Portuguese scientists working at CERN.

  19. 6 February 2012 - Supreme Audit Institutions from Norway, Poland, Spain and Switzerland visiting the LHC tunnel at Point 5, CMS underground experimental area, CERN Control Centre and LHC superconducting magnet test hall. Delegations are throughout accompanied by Swiss P. Jenni, Polish T. Kurtyka, Spanish J. Salicio, Norwegian S. Stapnes and International Relations Adviser R. Voss. (Riksrevisjonen, Oslo; Tribunal de Cuentas , Madrid; the Court of Audit of Switzerland and Najwyzsza Izba Kontroli, Varsaw)

    CERN Multimedia

    Jean-Claude Gadmer

    2012-01-01

    6 February 2012 - Supreme Audit Institutions from Norway, Poland, Spain and Switzerland visiting the LHC tunnel at Point 5, CMS underground experimental area, CERN Control Centre and LHC superconducting magnet test hall. Delegations are throughout accompanied by Swiss P. Jenni, Polish T. Kurtyka, Spanish J. Salicio, Norwegian S. Stapnes and International Relations Adviser R. Voss. (Riksrevisjonen, Oslo; Tribunal de Cuentas , Madrid; the Court of Audit of Switzerland and Najwyzsza Izba Kontroli, Varsaw)

  20. 18 December 2012 -Portuguese President of FCT M. Seabra visiting the Computing Centre with IT Department Head F. Hemmer, ATLAS experimental area with Collaboration Spokesperson F. Gianotti and A. Henriques Correia, in the LHC tunnel at Point 2 and CMS experimental area with Deputy Spokesperson J. Varela, signing an administrative agreement with Director-General R. Heuer; LIP President J. M. Gago and Delegate to CERN Council G. Barreia present.

    CERN Multimedia

    Samuel Morier-Genoud

    2012-01-01

    18 December 2012 -Portuguese President of FCT M. Seabra visiting the Computing Centre with IT Department Head F. Hemmer, ATLAS experimental area with Collaboration Spokesperson F. Gianotti and A. Henriques Correia, in the LHC tunnel at Point 2 and CMS experimental area with Deputy Spokesperson J. Varela, signing an administrative agreement with Director-General R. Heuer; LIP President J. M. Gago and Delegate to CERN Council G. Barreia present.

  1. CMS : the first barrel ring completed !

    CERN Multimedia

    Laurent Guiraud

    2000-01-01

    On 14 November, the CMS collaboration and the German firm DWE celebrated the successful construction of the detector's first yoke barrel ring. To mark the occasion, those in charge of the construction at CERN and DWE posed for the camera in the middle of the giant component.

  2. CMS Resistive plate Champers

    CERN Document Server

    Zainab, Karam

    2013-01-01

    There are many types of gas detectors which are used in CERN in LHC project, There is a main parts for the gas detectors which must be in all gas detectors types like Multiwire proportional chambers, such as the micromesh gaseous structure chamber (the MicroMegas), Gas-electron multiplier (GEM) detector, Resistive Plate Champers... Compact Muon Solenoid (CMS) experiment detecting muons which are powerful tool for recognizing signatures of interesting physics processes. The CMS detector uses: drift tube (DT), cathode strip chamber (CSC) and resistive plate chamber (RPC). Building RPC’s was my project in summer student program (hardware). RPC’s have advantages which are triggering detector and Excellent time resolution which reinforce the measurement of the correct beam crossing time. RPC’s Organized in stations :  RPC barrel (RB) there are 4 stations, namely RB1, RB2, RB3, and RB4  While in the RPC endcap (RE) the 3 stations are RE1, RE2, and RE3. In the endcaps a new starion will be added and this...

  3. Differential top-quark-pair cross sections in pp collisions at √(s)=7 TeV with CMS and charge multiplication in highly irradiated silicon sensors

    International Nuclear Information System (INIS)

    Modern particle-physics experiments like the ones at the Large Hadron Collider (LHC) are global and interdisciplinary endeavours comprising a variety of different fields. In this work, two different aspects are dealt with: on the one hand a top-quark physics analysis and on the other hand research and development towards radiation-hard silicon tracking detectors. The high centre-of-mass energy and luminosity at the LHC allow for a detailed investigation of top-quark-pair (t anti t) pro duction properties. Normalised differential t anti t cross sections (1)/(σ) (dσtantit)/(dX) are measured as a function of nine different kinematic variables X of the t anti t system, the top quarks and their decay products (b jets and leptons). The analysis is performed using data of proton-proton collisions at √(s) = 7 TeV recorded by the CMS experiment in 2011, corresponding to an integrated luminosity of 5 fb-1. A high-purity sample of t anti t events is selected according to the topology of the lepton+jets decay channel. Lepton-selection and trigger efficiencies are determined with data-driven methods. The top-quark four-vectors are reconstructed using a constrained kinematic fit. The reconstructed distributions are corrected for background and detector effects using a regularised unfolding technique. By normalising the differential cross sections with the in-situ measured total cross section, correlated systematic uncertainties are reduced, achieving a precision of typically 4-11%. The results are compared to standard-model predictions from Monte-Carlo event generators and approximate next-to-next-to-leading-order (NNLO) perturbative QCD calculations. A good agreement is observed. A high-luminosity upgrade of the LHC (HL-LHC) is envisaged for 2022, which implies increased radiation levels for the silicon tracking detectors. The innermost pixel layer is expected to be exposed to a 1-MeV-neutron-equivalent fluence in the order of 1016 cm-2. The novel effect of radiation

  4. Differential top-quark-pair cross sections in pp collisions at {radical}(s)=7 TeV with CMS and charge multiplication in highly irradiated silicon sensors

    Energy Technology Data Exchange (ETDEWEB)

    Lange, Joern

    2013-09-15

    Modern particle-physics experiments like the ones at the Large Hadron Collider (LHC) are global and interdisciplinary endeavours comprising a variety of different fields. In this work, two different aspects are dealt with: on the one hand a top-quark physics analysis and on the other hand research and development towards radiation-hard silicon tracking detectors. The high centre-of-mass energy and luminosity at the LHC allow for a detailed investigation of top-quark-pair (t anti t) pro duction properties. Normalised differential t anti t cross sections (1)/({sigma}) (d{sigma}{sub t} {sub anti} {sub t})/(dX) are measured as a function of nine different kinematic variables X of the t anti t system, the top quarks and their decay products (b jets and leptons). The analysis is performed using data of proton-proton collisions at {radical}(s) = 7 TeV recorded by the CMS experiment in 2011, corresponding to an integrated luminosity of 5 fb{sup -1}. A high-purity sample of t anti t events is selected according to the topology of the lepton+jets decay channel. Lepton-selection and trigger efficiencies are determined with data-driven methods. The top-quark four-vectors are reconstructed using a constrained kinematic fit. The reconstructed distributions are corrected for background and detector effects using a regularised unfolding technique. By normalising the differential cross sections with the in-situ measured total cross section, correlated systematic uncertainties are reduced, achieving a precision of typically 4-11%. The results are compared to standard-model predictions from Monte-Carlo event generators and approximate next-to-next-to-leading-order (NNLO) perturbative QCD calculations. A good agreement is observed. A high-luminosity upgrade of the LHC (HL-LHC) is envisaged for 2022, which implies increased radiation levels for the silicon tracking detectors. The innermost pixel layer is expected to be exposed to a 1-MeV-neutron-equivalent fluence in the order of 10

  5. Prince Albert II of Monaco visits CERN

    CERN Multimedia

    2009-01-01

    With a strong curiosity for the work of CERN, HSH Prince Albert II of Monaco visited CMS and the CERN Control Centre on 2 September. "The Prince is interested in and sensitive to what CERN is doing. Monaco is closely linked to France, which is an important member of CERN. He wishes to express his help to the scientific community in every trip. He wants to meet scientists and to be really personally involved," explained Francois Chantrait, Head of the Press Service of the Prince’s Palace. CERN Director-General Rolf Heuer welcomed the Prince of Monaco to Point 5 with a presentation about CERN before they descended 100 metres underground to see the CMS experiment. Although the detector was closed up for test runs, he was able to see its grand scale as well as look at some of the intricate sample parts exhibited by CMS Spokesperson, Jim Virdee. The Prince wrote in the CERN Visitors’ Book that he perceives a realisation of promisin...

  6. The Diverse use of Clouds by CMS

    Energy Technology Data Exchange (ETDEWEB)

    Andronis, Anastasios [CERN; Bauer, Daniela [Imperial Coll., London; Chaze, Olivier [CERN; Colling, David [Imperial Coll., London; Dobson, Marc [CERN; Fayer, Simon [Imperial Coll., London; Girone, Maria [CERN; Grandi, Claudio [INFN, Bologna; Huffman, Adam [Imperial Coll., London; Hufnagel, Dirk [Fermilab; Khan, Farrukh Aftab [Quaid-i-Azam U.; Lahiff, Andrew [Rutherford; McCrae, Alison [CERN; Rand, Duncan [Imperial Coll., London; Sgaravatto, Massimo [INFN, Padua; Tiradani, Anthony [Fermilab; Zhang, Xiaomei [Beijing, Inst. High Energy Phys.

    2015-12-23

    The resources CMS is using are increasingly being offered as clouds. In Run 2 of the LHC the majority of CMS CERN resources, both in Meyrin and at the Wigner Computing Centre, will be presented as cloud resources on which CMS will have to build its own infrastructure. This infrastructure will need to run all of the CMS workflows including: Tier 0, production and user analysis. In addition, the CMS High Level Trigger will provide a compute resource comparable in scale to the total offered by the CMS Tier 1 sites, when it is not running as part of the trigger system. During these periods a cloud infrastructure will be overlaid on this resource, making it accessible for general CMS use. Finally, CMS is starting to utilise cloud resources being offered by individual institutes and is gaining experience to facilitate the use of opportunistically available cloud resources.We present a snap shot of this infrastructure and its operation at the time of the CHEP2015 conference.

  7. The Diverse use of Clouds by CMS

    Science.gov (United States)

    Andronis, Anastasios; Bauer, Daniela; Chaze, Olivier; Colling, David; Dobson, Marc; Fayer, Simon; Girone, Maria; Grandi, Claudio; Huffman, Adam; Hufnagel, Dirk; Aftab Khan, Farrukh; Lahiff, Andrew; McCrae, Alison; Rand, Duncan; Sgaravatto, Massimo; Tiradani, Anthony; Zhang, Xiaomei

    2015-12-01

    The resources CMS is using are increasingly being offered as clouds. In Run 2 of the LHC the majority of CMS CERN resources, both in Meyrin and at the Wigner Computing Centre, will be presented as cloud resources on which CMS will have to build its own infrastructure. This infrastructure will need to run all of the CMS workflows including: Tier 0, production and user analysis. In addition, the CMS High Level Trigger will provide a compute resource comparable in scale to the total offered by the CMS Tier 1 sites, when it is not running as part of the trigger system. During these periods a cloud infrastructure will be overlaid on this resource, making it accessible for general CMS use. Finally, CMS is starting to utilise cloud resources being offered by individual institutes and is gaining experience to facilitate the use of opportunistically available cloud resources. We present a snap shot of this infrastructure and its operation at the time of the CHEP2015 conference.

  8. Brazil and CERN get closer

    CERN Multimedia

    2002-01-01

    The map of countries affiliated to CERN may in future include Brazil. On a visit to CERN last week, the Brazilian Minister of State for Science and Technology, Ronaldo Mota Sardenberg, expressed his country's interest in closer links to the Laboratory.   Luciano Maiani and the Brazilian Minister of State for Science and Technology Ronaldo Mota Sardenberg shake hands on CERN-Brazil co-operation. During his visit, the Minister and CERN Director General Luciano Maiani issued a joint statement for the continuation of a Co-operation Agreement first established in 1990. They also agreed to study the possibility of Brazil joining CERN-led Grid computing infrastructure projects. Brazilian physicists are already involved in the LHCb, ATLAS and CMS experiments. At the conclusion of the Minister's visit, he and Director-General Maiani agreed to establish a Working Group to examine ways of strengthening Brazil's links with CERN, and to prepare the way for a Brazilian request to CERN Council to become an Observer at th...

  9. Thousands of kilometres to visit CERN

    CERN Multimedia

    2003-01-01

    Students from the Columbus high school in the state of Mississippi with their physics teacher Ken Wester (left at rear) and Michel Della Negra, CMS spokesman (in front).An American school at CERN ? Unusual, to say the least... Yet 15 students from the class of Ken Wester, physics teacher in the Columbus High School, Mississippi, didn't hesitate to travel thousands of kilometres to come to CERN. Ken Wester participated last year in CERN's High School Teacher programme. Enthralled by his visit, he has organised the trip for his final year students to visit CERN. The 18-year-olds arrived on the 10th March and spent two days at the laboratory, visiting the CMS construction site and the AD antimatter factory, before leaving on a tour of Switzerland and Germany.

  10. CERN and Pakistan consolidate their partnership

    CERN Multimedia

    2006-01-01

    During the President of Pakistan's visit to CERN, the Laboratory and Pakistan decided to strengthen their collaboration. The President of Pakistan, Pervez Musharraf, the Chairman of PAEC, Parvez Butt, and CERN's Director-General, Robert Aymar, exchange congratulations following the signing of the letter of intent to strengthen partnership between CERN and Pakistan.The President of the Islamic Republic of Pakistan, Pervez Musharraf, during his speech in the Council Chamber. The President of the Islamic Republic of Pakistan, General Pervez Musharraf, visited CERN on 27 January this year, accompanied by an important delegation of five ministers from the Pakistani Government, the Chairman of Pakistan's Atomic Energy Commission (PAEC), Parvez Butt, and an eminent former Chairman of the Commission, Ishfaq Ahmad, who pioneered cooperation with CERN. Welcomed by CERN's Director-General, Robert Aymar, the President visited the CMS experiment to which Pakistan is making a substantial contribution. The presidential pa...

  11. Award for the best CMS thesis

    CERN Multimedia

    2003-01-01

    The 2002 CMS PhD Thesis Award for has been presented to Giacomo Luca Bruno for his thesis defended at the University of Pavia in Italy and entitled "The RPC detectors and the muon system for the CMS experiment at the LHC". His work was supervised by Sergio P. Ratti from the University of Pavia. Since April 2002, Giacomo has been employed as a research fellow by CERN's EP Division. He continues to work on CMS in the areas of data acquisition and physics reconstruction and selection. Last Monday he received a commemorative engraved plaque from Lorenzo Foà, chairman of the CMS Collaboration Board. He will also receive expenses paid to an international physics conference to present his thesis results. Giacomo Luca Bruno with Lorenzo Foà

  12. Predicting dataset popularity for the CMS experiment

    CERN Document Server

    Kuznetsov, Valentin; Giommi, Luca; Bonacorsi, Daniele; Wildish, Tony

    2016-01-01

    The CMS experiment at the LHC accelerator at CERN relies on its computing infrastructure to stay at the frontier of High Energy Physics, searching for new phenomena and making discoveries. Even though computing plays a significant role in physics analysis we rarely use its data to predict the system behavior itself. A basic information about computing resources, user activities and site utilization can be really useful for improving the throughput of the system and its management. In this paper, we discuss a first CMS analysis of dataset popularity based on CMS meta-data which can be used as a model for dynamic data placement and provide the foundation of data-driven approach for the CMS computing infrastructure.

  13. Particle Flow at CMS and the ILC

    CERN Document Server

    Ballin, J A C

    2010-01-01

    This thesis describes hadron reconstruction at the Compact Muon Solenoid (CMS) experiment at the Large Hadron Collider (LHC) at CERN, Geneva. The focus is on the particle flow reconstruction of these objects. This thesis revisits the subject of the CMS calorimeters' non-linear response to hadrons. Data from testbeam experiments conducted in 2006 & 2007 is compared with simulations and substantial differences are found. A particle flow calibration to correct the energy response of the testbeam data is evaluated. The reconstructed jet response is found to change by ~ 5% when a data-driven calibration is used in place of the calibration derived from simulation. Collision data taken at the early stage of CMS' commissioning is also presented. The hadron response in data is determined to be compatible with testbeam results presented in this thesis. This thesis also details the use of neural networks to improve the energy measurement of hadrons at CMS. The networks are implemented in a functional and concurrent ...

  14. The CMS Muon System Alignment

    CERN Document Server

    Martinez Ruiz-Del-Arbol, P

    2009-01-01

    The alignment of the muon system of CMS is performed using different techniques: photogrammetry measurements, optical alignment and alignment with tracks. For track-based alignment, several methods are employed, ranging from a hit and impact point (HIP) algorithm and a procedure exploiting chamber overlaps to a global fit method based on the Millepede approach. For start-up alignment as long as available integrated luminosity is still significantly limiting the size of the muon sample from collisions, cosmic muon and beam halo signatures play a very strong role. During the last commissioning runs in 2008 the first aligned geometries have been produced and validated with data. The CMS offline computing infrastructure has been used in order to perform improved reconstructions. We present the computational aspects related to the calculation of alignment constants at the CERN Analysis Facility (CAF), the production and population of databases and the validation and performance in the official reconstruction. Also...

  15. Thomas Kibble visits CERN

    CERN Multimedia

    Rosaria Marraffino

    2014-01-01

    Emeritus Professor Sir Thomas W.B. Kibble, from Imperial College London visited LHC for the first time last week and delivered a colloquium on the genesis of electroweak unification and the Brout-Englert-Higgs mechanism.   From left to right: Jim Virdee, Tiziano Camporesi, Tom Kibble and Austin Ball on the visit to CMS. On his way back from Trieste, where he received the Abdus Salam International Centre for Theoretical Physics' Dirac Medal, Tom Kibble stopped by CERN for his first visit to the LHC. Kibble had a standing invitation from Jim Virdee, former CMS spokesperson, who is also a researcher from Imperial College London. Peter Jenni (left) and Tom Kibble tour the ATLAS detector. (Image: Erwan Bertrand) Kibble made the trip to CERN a family outing and brought along 14 relatives,  including his children and grandchildren. He visited the ATLAS detector with Peter Jenni, its former spokesperson, on Friday 10 October. In the afternoon, Kibble delivered a colloquium in the...

  16. The Duke of York visits CERN

    CERN Multimedia

    2004-01-01

    The Duke of York chats before inaugurating the UK@CERN exhibition. From left to right: Robert Aymar, CERN's Director General, the Duke of York, and leading UK scientists at CERN: Jim Virdee, CMS deputy spokeman; theorist John Ellis ; and Steve Myers, head of the AB Department. On 23 November, the Duke of York visited CERN and, in his capacity as the UK's Special Representative for International Trade and Investment, inaugurated the UK@CERN Exhibition. This biennial trade show was initially held in 1968, the first such exhibition by a CERN member state. This year 22 companies displayed goods and services that could be of interest to CERN scientists. In his inaugural speech, the Duke emphasized that business between companies and CERN "is a two-way information flow with mutual benefits." The companies make sales but also benefit from technologies that CERN transfers to them. CERN benefits from the exchange, the Duke said, addressing CERN's scientists, because it "frees your time for what you do best: science....

  17. CERN Choir

    CERN Multimedia

    Staff Association

    2015-01-01

      Do you like singing? The CERN Choir is looking for basses and tenors Join us! Programme Spring Session 2015: Donizetti: Misere & Missa di Gloria e Credo Bellini: Salve Regina Bruckner: Requiem in D minor Next concert: Sunday 31 May 2015 at 17:00 Musicales de Comesières (GE) Rehearsals at CERN Main Auditorium, building 500 On Wednesdays from 20.00 to 22:00 Membership fee: January to June 150 CHF September to December: 100CHF Contact: Baudouin.bleus@cern.ch Facebook/Choeur-du-CERN

  18. CMS Wallet Card

    Data.gov (United States)

    U.S. Department of Health & Human Services — The CMS Wallet Card is a quick reference statistical summary on annual CMS program and financial data. The CMS Wallet Card is available for each year from 2004...

  19. CMS Fast Facts

    Data.gov (United States)

    U.S. Department of Health & Human Services — CMS has developed a new quick reference statistical summary on annual CMS program and financial data. CMS Fast Facts includes summary information on total program...

  20. Radiation damage effects on CMS sensors quality assurance and irradiation tests

    CERN Document Server

    Furgeri, Alexander J; de Boer, Wim; Forton, E; Freudenstein, S; Hartmann, F

    2004-01-01

    The Large Hadron Collider (LHC) at the Centre Europeenne pour la Recherche Nucleaire (CERN), Geneva, Switzerland, is a proton-proton collider with a luminosity of 10**3**4/cm**2s and will be working for ten years (starting in 2007). The Compact Muon Solenoid (CMS) will be one of the four general-purpose detectors. The CMS tracker consists of ten barrel layers, plus 2 multiplied by 9 end cap discs, which amounts to a total of 24 328 silicon sensors with a total area of 206 m**2 silicon, covering a pseudorapidity of vertical bar eta; vertical bar less than approximately equals 2.5. For the sensors close to the beam pipe, fluences of 1.6 center dot 10**1**4n//1 MeV/cm**2 are expected over the ten-year lifetime. To guarantee the functionality of the single-side silicon sensors during the runtime of the LHC, quality assurance was developed. In the two Irradiation Qualification Centers (IQCs) in Karlsruhe, Germany, and Louvain-la-Neuve, Belgium, a fraction of 1% of the sensors are electrically qualified. In Karlsru...

  1. Construction of the CMS Tracker End-Caps and an Impact Study on Defects

    CERN Document Server

    Linn, Alexander

    2008-01-01

    The CMS experiment at the LHC accelerator at the research center CERN close to Geneva will study proton proton collisions at up to now unprecedented centre of mass energies from the year 2008 on. To discover theoretically predicted elementary particles, CMS was equipped with the largest silicon tracker so far with a sensitive area of 198m2. Partitioned into more than 15.000 silicon strip modules, the construction and test of the tracker was a huge challenge for the involved institutes. The III. Physikalisches Institut B of the RWTH Aachen had a leading role in the construction and test of substructures, so called petals, for the end caps of the tracker. The petals were assembled in a clean room and underwent first basic tests to ensure the general operationability of each component. Failures detected during the assembly are described and improvements of the silicon strip modules are discussed. After the assembly the petals underwent a cold test for several days. For the first time all readout components of th...

  2. Silicon detector technology development in India for the participation in international experiments

    Indian Academy of Sciences (India)

    Anita Topkar; S Praveenkumar; Bharti Aggarwal; S K Kataria; M D Ghodgaonkar

    2007-12-01

    A specific research and development program has been carried out by BARC in India to develop the technology for large area silicon strip detectors for application in nuclear and high energy physics experiments. These strip detectors will be used as pre-shower detector in the CMS experiment at LHC, CERN for 0/ rejection. The fabrication technology to produce silicon strip detectors with very good uniformity over a large area of ∼ 40 cm2, low leakage currents of the order of 10 nA/cm2 per strip and high breakdown voltage of >500 V has been developed by BARC. The production of detectors is already under way to deliver 1000 detector modules for the CMS and 90% production is completed. In this paper, research and development work carried out to develop the detector fabrication technology is briefly described. The performance of the silicon strip detectors produced in India is presented. The present status of the detector technology is discussed.

  3. Results from a hybrid silicon pixel telescope tested in a heavy ion experiment at the Cern Omega Spectrometer

    International Nuclear Information System (INIS)

    A telescope made of three OMEGA-ION hybrid silicon pixel detectors has been successfully tested in the heavy ion experiment WA94. Each plane consisted of a single detector with 1006 active pixels (500 μm x 75 μm), each one being bump-bonded to the read-out chip, and arranged in 16 columns and 63 rows respectively. With a sensitive area as small as 8000x4725 μm2 several million events with at least one track originating from sulphur-sulphur interactions have been recorded in a few hours. Results on target reconstruction, tracking accuracy and efficiency are presented. (orig.)

  4. Large Area Silicon Tracking Detectors with Fast Signal Readout for the Large Hadron Collider (LHC) at CERN

    CERN Document Server

    Köstner, S

    2005-01-01

    The Standard Model of elementary particles, which is summarized briefly in the second chapter, incorporates a number of successful theories to explain the nature and consistency of matter. However not all building blocks of this model could yet be tested by experiment. To confirm existing theories and to improve nowadays understanding of matter a new machine is currently being built at CERN, the Large Hadron Collider (LHC), described in the third chapter. LHC is a proton-proton collider which will reach unprecedented luminosities and center of mass energies. Five experiments are attached to it to give answers to questions like the existence of the Higgs meson, which allows to explain the mass content of matter, and the origin of CP-violation, which plays an important role in the baryogenesis of the universe. Supersymmetric theories, proposing a bosonic superpartner for each fermion and vice versa, will be tested. By colliding heavy ions, high energy and particle densities can be achieved and probed. This stat...

  5. CMS object-oriented analysis

    International Nuclear Information System (INIS)

    The CMS OO reconstruction program-ORCA-has been used since 1999 to produce large samples of reconstructed Monte-Carlo events for detector optimization, trigger and physics studies. The events are stored in several Objectivity federations at CERN, in the US, Italy and other countries. To perform their studies physicists use different event samples ranging from complete datasets of TByte size to only a few events out of these datasets. The authors describe the implementation of these requirements in the ORCA software and the way collections of events are accessed for reading, writing or copying

  6. CMS Object—Oriented Analysis

    Institute of Scientific and Technical Information of China (English)

    V.Innocente; E.Meschi; 等

    2001-01-01

    The CMS OO reconstruction program-ORCA-has been used since 1999 to produce large samples of reconstructed Monte-Carlo events for detector optimization,trigger and physics studies,The events are stored in several Objectivity federations at CERN,in the US,Italy and other countries.To perform their studies physicists use different event samples ranging from complete datasets of TByte size to only a few events out of these datasets.We describe the implementation of these requirements in the ORCA software and the way collctions of events are accessed for reading,writing or copying.

  7. The CERN Visits Service proposes: Lab Visits for CERN People

    CERN Multimedia

    2001-01-01

    The CMS assembly hall at point 5 - one of the new Visits Service itineraries. Discover the new visits itineraries of your laboratory with the Visits Service! The recently completed visitors platform in the CMS detector assembly hall at point 5, first of a series of new visit tours, will be the destination for special summer visits organised by the Visits Service for CERN people. Each week the Visits Service will reserve a slot to take CERN people to visit the CMS assembly hall and get first hand experience of the magnitude of the LHC endeavour. Tours will be shorter than the public visit programme, and will include a short introduction in the bus along with a guided tour of the CMS visitor platform. Visits will start at 3.30 pm from the visits meeting point in the reception of building 33, and the bus will be back at reception at 5 pm. Up to 24 people can take part in each visit. The calendar for the coming weeks is: Friday 27 July in French Thursday 2 August in English Wednesday 8 August in French Booking...

  8. 2 September 2009 - H.S.H. Prince Albert II of Monaco (second from right) visiting CMS underground experimental area with, from left to right, Ambassador R. Fillon, Collaboration Spokesperson T. Virdee and CERN Director-General R. Heuer.

    CERN Multimedia

    Maximilien Brice

    2009-01-01

    Tirage 1-28:caverne expérimentale CMS avec le Porte-parole de la Collaboration T. Virdee Tirage 29-42:CCC avec le Chef du Département Faisceaux(BE) P. Collier et Département Faisceaux, groupe opérations, LHC Ingénieur Responsable L. Ponce.

  9. CMS: the first barrel ring completed!

    CERN Multimedia

    2000-01-01

    Seven years after design studies began, CERN and the German company DWE have erected the first of the five CMS yoke rings, a giant component weighing 1200 tonnes. The first ring of the CMS magnet yoke, a twelve-sided 15-metre-high colossus, has been erected in the new hall at Point 5 near Cessy. For the last few days it has stood unaided, no longer relying on the central structure required for its assembly. Its construction marks an important milestone in the CMS programme, the culmination of seven years of work at CERN and over two years of manufacturing at DWE. Awarded the contract by the Swiss Federal Institute of Technology (ETH), Zürich, the German manufacturer has produced and assembled the ring components in collaboration with a team from CERN. This feat of mechanical engineering was celebrated two weeks ago at a drink attended by the main protagonists, headed by Franz Kufner, divisional manager at DWE, Franz Leher, production engineer at DWE, Alain Hervé, CMS technical coordinator,...

  10. Courrier CERN

    CERN Multimedia

    2015-01-01

    Example of the cover page of the French version of the CERN Courier; Courrier CERN from January 1962. The journal was published both in English and French up to volume 45, no. 5, June 2005. Since then there is a single-language edition where articles are published either in French or English with an abstract in the other language.

  11. CMS releases new batch of LHC open data

    CERN Document Server

    Achintya Rao

    2016-01-01

    CMS makes 300 TB of high-quality data from the LHC available to the public through the CERN Open Data Portal.   A CMS collision event as seen in the built-in event display on the CERN Open Data Portal (Image: CERN) The CMS collaboration has made 300 TB of high-quality data from the LHC available to the public through the CERN Open Data Portal. The collision data come in two types: The so-called “primary datasets” are in the same format used by the CMS Collaboration to perform research. The “derived datasets” on the other hand require a lot less computing power and can be readily analysed by university or even high-school students. Notably, CMS is also providing the simulated data generated with the same software version that should be used to analyse the primary datasets. Simulations play a crucial role in particle-physics research and CMS is also making available the protocols for generating the simulations that are provided. The data release is accompanie...

  12. Development of new sensor designs and investigations on radiation hard silicon strip sensors for CMS at the Large Hadron Collider during the high luminosity phase

    CERN Document Server

    Hoffmann, Karl-Heinz

    Mit dem geplanten Upgrade des LHC müssen auch die Experimente aufgewertet werden. Für den CMS Detektor wird daher ein neuer Spurdetektor benötigt. Dafür wurden neuartige Sensorkonzepte entwickelt und untersucht. Zum einen wurden die von der CMS Upgrade Gruppe gegebenen Anforderungen an ein neues Sensorkonzept erfüllt und sogar übertroffen, und zum anderen wurden Untersuchungen an strahlenharten Siliziumstreifensensoren durchgeführt, um das am besten geeignete Material zu finden.

  13. CERN & Society

    CERN Multimedia

    2016-01-01

    Non Member State Summer Students 2015 are interviewed about their decision to study STEM subjects, to apply for CERN NMSSS programme, their experience onsite @CERN and takeaways, their future goals and aspirations, offering also advice to fellow students.The Non Member State Summer Student Programme stands for a unique opportunity for students from all over the world to spend their summer at CERN in Geneva, getting involved in some of the world’s biggest experiments. For 8 weeks, summer students gather on-site at CERN and join in the day-to-day work of research. The Programme targets advanced undergraduate and beginning graduate students of physics, computing and engineering, particularly from developing countries. Participating students receive scientific training, attend lectures and work on laboratory-based projects alongside with CERN experts and fellow students.

  14. The silicon sensor for the compact muon solenoid tracker. Control of the fabrication process

    International Nuclear Information System (INIS)

    The Compact Muon Solenoid (CMS) is one of the experiments at the Large Hadron Collider (LHC) under construction at CERN. The inner tracking system of this experiment consists of the world largest Silicon Strip Tracker (SST). In total, 24,244 silicon sensors are implemented covering an area of 206 m2. To construct this large system and to ensure its functionality for the full lifetime of ten years under the hard LHC condition, a detailed quality assurance program has been developed. This paper describes the strategy of the Process Qualification Control to monitor the stability of the fabrication process throughout the production phase and the results obtained are shown. (authors)

  15. Serbian President visits CERN

    CERN Multimedia

    Katarina Anthony

    2012-01-01

    On Tuesday 10 January, Serbian President Boris Tadić visited the Laboratory to sign the Agreement of granting the status of Associate Membership as the pre-stage to full Membership of CERN.    Before the signing ceremony, the President, welcomed by Director-General Rolf Heuer at CERN’s Point 5, took the opportunity to visit CERN. After a general introduction, the President took advantage of the shutdown to visit the LHC’s underground caverns. Leading the President through their respective experiments were spokespersons Fabiola Gianotti (ATLAS) and Joe Incandela (CMS).  After a morning of tours, President Tadić and Rolf Heuer signed the Agreement. Serbia’s status as an Associate Member as pre-stage to full Membership is expected to come into force following ratification by the Serbian Parliament. After a maximum period of five years, the CERN Council will decide on the admission of Serbia to full Membership. This new agreement continues Serbia&a...

  16. Analysis of the CMS visitors feedback Poster

    CERN Multimedia

    Davis, Siona Ruth

    2016-01-01

    CMS welcomed over 5500 visitors underground during the 2013 CERN Open Days and more than 4500 during the Neighbourhood Days of 2014 on the occasion of CERN’s 60th anniversary. During the latter event, visitors gave their feedback on the visit experience by answering three questions: • In one sentence, what will you tell your friends about what you saw today? • What fact or story that you heard today impressed you the most? • Describe the CMS detector in three words. This poster will show the analysis of the answers given by visitors.

  17. Analysis of the CMS visitors feedback Poster

    CERN Multimedia

    Davis, Siona Ruth

    CMS welcomed over 5500 visitors underground during the 2013 CERN Open Days and more than 4500 during the Neighbourhood Days of 2014 on the occasion of CERN’s 60th anniversary. During the latter event, visitors gave their feedback on the visit experience by answering three questions: • In one sentence, what will you tell your friends about what you saw today? • What fact or story that you heard today impressed you the most? • Describe the CMS detector in three words. This poster will show the analysis of the answers given by visitors.

  18. Swiss State Secretary visits CERN

    CERN Multimedia

    2008-01-01

    The new Swiss State Secretary for Education and Research recently visited CERN. Peter Jenni, the spokesperson for ATLAS, gave Mauro Dell’Ambrogio, the new Swiss State Secretary for Education and Research, a tour of ATLAS and the LHC tunnel.On 2 April, the newly appointed Swiss State Secretary for Education and Research, Mauro Dell’Ambrogio, was welcomed to CERN by Director-General Robert Aymar. On arrival the Swiss minister was given a guided tour of ATLAS and the adjoining LHC tunnel by Peter Jenni, the ATLAS spokesperson. Dr Dell’Ambrogio was then greeted by Swiss scientists and attended presentations by young post doc physicists about Swiss contributions to CMS and LHCb, in particular their work concerning hardware contribution and data analysis. There are 120 physicists from Swiss universities working on CERN’s experiments, and many more Swiss people working at CERN in other departments due to Switzerland’s special position as a host state. Also before ...

  19. Three European ministers visit CERN

    CERN Multimedia

    2007-01-01

    There have been three ministerial visits to CERN this month. Gediminas Kirkilas, Prime Minister of Lithuania, and Robert Aymar, CERN’s Director-General.On 2 July, the Prime Minister of Lithuania, Gediminas Kirkilas, was welcomed by CERN’s Director-General, Robert Aymar, before being taken on a visit of the ATLAS cavern at Point 2 and the LHC tunnel. Michal Sewerynski, Poland’s Minister for Science and Higher Education, and Robert Aymar, CERN’s Director-General.Ten days later, Poland’s Minister for Science and Higher Education, Michal Sewerynski, visited the CMS cavern and assembly hall and the LHC tunnel. He was also given a tour of the LHC Computer Centre and the CERN Control Centre. His visit was rounded off with a presentation of Polish companies involved in CERN’s activities, followed by a meeting with Polish personnel working at CERN. J�...

  20. Hangout With CERN: Antimatter (S01E05)

    CERN Multimedia

    Kahle, Kate

    2012-01-01

    In this hangout we delve into the world of antimatter. How is it different from matter? What antimatter research is going on at CERN? Why? What have we learned so far and what will this research lead to? ATLAS physicist Steven Goldfarb is joined by CERN theorist Alex Arbey, Seth Zenz from the CMS experiment, and Michael Doser, Makoto Fujiwara and Masaki Hori from the antimatter experiments at CERN.Recorded live on 29th November 2012.

  1. Iranian and Kazakh representatives visit CERN

    CERN Multimedia

    2004-01-01

    On 1st and 4th March respectively, CERN received visits from Asset Issekeshev, Kazakhstan's Vice-Minister of Industry and Trade, and Reza Mansouri, Deputy Minister for Science, Research and Technology of the Islamic Republic of Iran. Asset Issekeshev and his delegation came to CERN with the aim of learning "the European way of building strong and effective ties between science and the industrial sector". Welcomed by Maximilian Metzger, CERN's Secretary-General, he visited the ATLAS assembly hall and the CLIC installations before signing the visitors' book. After a short visit to Point 5 (CMS), Reza Mansouri met CERN's Director-General, Robert Aymar, before talking to Iranian PhD students working on their theses at CERN. Asset Issekeshev, Kazakhstan's Vice-Minister of Industry and Trade, signs the visitors' book, watched by Maximilian Metzger, CERN's Secretary-General.From left to right: Mojtaba Mohammadi and Majid Hashemi (Iranian PhD students at CERN); Dr Daniel Denegri (CMS), Professor Re...

  2. CERN tests largest superconducting solenoid magnet

    CERN Multimedia

    2006-01-01

    "CERN's Compacts Muon Solenoid (CMS) - the world's largest superconducting solenoid magnet - has reached full field in testing. The instrument is part of the proton-proton Large Hadron Collider (LHC) project, located in a giant subterranean chamber at Cessy on the Franco-Swiss border." (1 page)

  3. Prime-Minister of Malta visits CERN

    CERN Multimedia

    2008-01-01

    The Prime-Minister of Malta, Dr Lawrence Gonzi, visited CERN and met Director-General, Robert Aymar, on 10 January. The Prime-Minister of Malta, Dr Lawrence Gonzi, and CERN Director-General, Robert Aymar, signed a cooperation agreement. Dr Gonzi was given guided tours of the CMS experiment at Point 5 in Cessy and of the LHC magnet test facility, in which his country was involved. One of the high points of the day was the signing of a cooperation agreement between CERN and the Government of the Republic of Malta, aimed at the development of scientific and technical collaboration. "I’m really enthusiastic about this agreement, which constitutes a first step towards real collaboration between the Maltese government and CERN," said Nicholas Sammut, a Maltese engineer at CERN who was present throughout the visit (on the right). See also the video.

  4. CERN signs draft Memorandum of Understanding with Iran

    CERN Multimedia

    2001-01-01

    Left to right: Dr Henrik Foeth, Team Leader CMS; Dr Daniel Denegri, Physics Coordinator CMS; Prof. Tejinder Virdee, Deputy Spokesman CMS; Prof. Luciano Maiani, CERN Director-General - signing; Mr Jean-Marie Dufour, Head of the CERN Legal Service, Mr Ghodratollah Habibpour Gharakol, back; Dr Abdolali Sharghi, Advisor to the Minister and Director General, Office of International Scientific Cooperation, Iranian Ministry of Science, Research and Technology; Dr Mostafa Moin, Minister of Science, Research and Technology, Islamic Republic of Iran - signing; Dr Reza Mansouri, Director, International Scientific Meetings Office, Iranian Ministry of Science, Research and Technology; H. E. Dr Ali Khorram, Extraordinary and plenipotentiary Ambassador of the Islamic Republic of Iran to the United Nations in Geneva, Dr Hans F. Hoffmann, CERN Director for Technology Transfer & for Scientific Computing. Iranian Minister for Science, Research and Technology, Dr Mostafa Moin, and CERN Director-General Luciano Maiani, s...

  5. The CMS integration grid testbed

    International Nuclear Information System (INIS)

    The CMS Integration Grid Testbed (IGT) comprises USCMS Tier-1 and Tier-2 hardware at the following sites: the California Institute of Technology, Fermi National Accelerator Laboratory, the University of California at San Diego, and the University of Florida at Gainesville. The IGT runs jobs using the Globus Toolkit with a DAGMan and Condor-G front end. The virtual organization (VO) is managed using VO management scripts from the European Data Grid (EDG). Gridwide monitoring is accomplished using local tools such as Ganglia interfaced into the Globus Metadata Directory Service (MDS) and the agent based Mona Lisa. Domain specific software is packaged and installed using the Distribution After Release (DAR) tool of CMS, while middleware under the auspices of the Virtual Data Toolkit (VDT) is distributed using Pacman. During a continuous two month span in Fall of 2002, over 1 million official CMS GEANT based Monte Carlo events were generated and returned to CERN for analysis while being demonstrated at SC2002. In this paper, we describe the process that led to one of the world's first continuously available, functioning grids

  6. The CMS integration grid testbed

    Energy Technology Data Exchange (ETDEWEB)

    Graham, Gregory E.

    2004-08-26

    The CMS Integration Grid Testbed (IGT) comprises USCMS Tier-1 and Tier-2 hardware at the following sites: the California Institute of Technology, Fermi National Accelerator Laboratory, the University of California at San Diego, and the University of Florida at Gainesville. The IGT runs jobs using the Globus Toolkit with a DAGMan and Condor-G front end. The virtual organization (VO) is managed using VO management scripts from the European Data Grid (EDG). Gridwide monitoring is accomplished using local tools such as Ganglia interfaced into the Globus Metadata Directory Service (MDS) and the agent based Mona Lisa. Domain specific software is packaged and installed using the Distribution After Release (DAR) tool of CMS, while middleware under the auspices of the Virtual Data Toolkit (VDT) is distributed using Pacman. During a continuous two month span in Fall of 2002, over 1 million official CMS GEANT based Monte Carlo events were generated and returned to CERN for analysis while being demonstrated at SC2002. In this paper, we describe the process that led to one of the world's first continuously available, functioning grids.

  7. Distributed data transfers in CMS

    Science.gov (United States)

    Magini, Nicolo; Ratnikova, Natalia; Rossman, Paul; Sánchez-Hernández, Alberto; Wildish, Tony

    2011-12-01

    The multi-tiered computing infrastructure of the CMS experiment at the LHC depends on the reliable and fast transfer of data between the different CMS computing sites. Data have to be transferred from the Tier-0 to the Tier-l sites for archival in a timely manner to avoid overflowing disk buffers at CERN. Data have to be transferred in bursts to all Tier-2 level sites for analysis as well as synchronized between the different Tier-l sites. The data transfer system is the key ingredient which enables the optimal usage of all distributed resources. The operation of the transfer system consists of monitoring and debugging of transfer issues to guarantee a timely delivery of data to all corners of the CMS computing infrastructure. Further task of transfer operation is to guarantee the consistency of the data at all sites, both on disk and on tape. Procedures to verify the consistency and to debug and repair problems will be discussed.

  8. Recent CMS Results

    CERN Document Server

    Dorigo, Tommaso

    2012-01-01

    The CMS experiment obtained a large number of groundbreaking results from the analysis of 7- and 8-TeV proton-proton collisions produced so far by the Large Hadron Collider at CERN. In this brief summary only a sample of those results will be discussed. A new particle with mass m(H) = 125.3 +- 0.4(stat.) +- 0.5(syst.) GeV and characteristics compatible with those expected for a standard model Higgs boson has been observed in its decays to photon pairs, WW pairs, and ZZ pairs. Searches for the rare decays B_d -> mu mu and B_s -> mu mu have allowed to set limits on the branching fractions which are close to standard model predictions, strongly constraining new physics models. The top quark has been studied with great detail, obtaining among other results the world's best measurement of its mass as m(top) = 173.49 +- 0.43(stat. + JES) +- 0.98(syst.) GeV. New physics models have been strongly constrained with the available data.

  9. The CMS link system

    International Nuclear Information System (INIS)

    The Compact Muon Solenoid (CMS) is a multi-purpose detector that is going to be installed in the future Large Hadron Collider (LHC) at CERN. Muons are one of the main physical signatures of the expected new physics. The muons are going to be detected by the Central Tracker (CT) and the Muon Spectrometer (MS). Both, the CT and MS can provide an independent muon momentum measurement, but for all η and momentum values the highest precision for muon momentum measurement is achieved when the muon tracks are reconstructed using both tracking detectors. The calorimeters and the solenoid volumes separate about three meters the CT and the MS. It has been shown that the alignment of the CT with respect to the MS can not be guaranteed by a software alignment in a reasonable time scale. Therefore, an opto-mechanical system (the multipoint link system) have been designed to monitor, on-line, the relative position of both sub-detectors providing a common reference frame for both of them. The local alignment of the muon barrel spectrometer determines the relative position of the muon chambers with respect to themselves and also with respect to a carbon fiber rigid structure called MAB (Module for the Alignment of the Barrel). There are a total of 36 MABs distributed in the boundary planes of each muon spectrometer sector. This paper describes all the equipment and presents the principle of measurement. (author)

  10. CERN Rocks

    CERN Multimedia

    2004-01-01

    The 15th CERN Hardronic Festival took place on 17 July on the terrace of Rest 3 (Prévessin). Over 1000 people, from CERN and other International Organizations, came to enjoy the warm summer night, and to watch the best of the World's High Energy music. Jazz, rock, pop, country, metal, blues, funk and punk blasted out from 9 bands from the CERN Musiclub and Jazz club, alternating on two stages in a non-stop show.  The night reached its hottest point when The Canettes Blues Band got everybody dancing to sixties R&B tunes (pictured). Meanwhile, the bars and food vans were working at full capacity, under the expert management of the CERN Softball club, who were at the same time running a Softball tournament in the adjacent "Higgs Field". The Hardronic Festival is the main yearly CERN music event, and it is organized with the support of the Staff Association and the CERN Administration.

  11. A silicon tracker for Christmas

    CERN Multimedia

    2008-01-01

    The CMS experiment installed the world’s largest silicon tracker just before Christmas. Marcello Mannelli: physicist and deputy CMS project leader, and Alan Honma, physicist, compare two generations of tracker: OPAL for the LEP (at the front) and CMS for the LHC (behind). There is quite a difference between 1m2 and 205m2.. CMS received an early Christmas present on 18 December when the silicon tracker was installed in the heart of the CMS magnet. The CMS tracker team couldn’t have hoped for a better present. Carefully wrapped in shiny plastic, the world’s largest silicon tracker arrived at Cessy ready for installation inside the CMS magnet on 18 December. This rounded off the year for CMS with a major event, the crowning touch to ten years of work on the project by over five hundred scientists and engineers. "Building a scientific instrument of this size and complexity is a huge technical a...

  12. Distributed computing grid experiences in CMS

    CERN Document Server

    Andreeva, Julia; Barrass, T; Bonacorsi, D; Bunn, Julian; Capiluppi, P; Corvo, M; Darmenov, N; De Filippis, N; Donno, F; Donvito, G; Eulisse, G; Fanfani, A; Fanzago, F; Filine, A; Grandi, C; Hernández, J M; Innocente, V; Jan, A; Lacaprara, S; Legrand, I; Metson, S; Newbold, D; Newman, H; Pierro, A; Silvestris, L; Steenberg, C; Stockinger, H; Taylor, Lucas; Thomas, M; Tuura, L; Van Lingen, F; Wildish, Tony

    2005-01-01

    The CMS experiment is currently developing a computing system capable of serving, processing and archiving the large number of events that will be generated when the CMS detector starts taking data. During 2004 CMS undertook a large scale data challenge to demonstrate the ability of the CMS computing system to cope with a sustained data- taking rate equivalent to 25% of startup rate. Its goals were: to run CMS event reconstruction at CERN for a sustained period at 25 Hz input rate; to distribute the data to several regional centers; and enable data access at those centers for analysis. Grid middleware was utilized to help complete all aspects of the challenge. To continue to provide scalable access from anywhere in the world to the data, CMS is developing a layer of software that uses Grid tools to gain access to data and resources, and that aims to provide physicists with a user friendly interface for submitting their analysis jobs. This paper describes the data challenge experience with Grid infrastructure ...

  13. The CMS Magnetic Field Map Performance

    CERN Document Server

    Klyukhin, VI; Sarycheva, L I; Klyukhin, V I; Ball, A; Gaddi, A; Amapane, N; Gerwig, H; Andreev, V; Cure, B; Mulders, M; Loveless, R; Karimaki, V; Popescu, S; Herve, A

    2010-01-01

    The Compact Muon Solenoid (CMS) is a general-purpose detector designed to run at the highest luminosity at the CERN Large Hadron Collider (LHC). Its distinctive featuresinclude a 4 T superconducting solenoid with 6 m diameter by 12.5 m long free bore, enclosed inside a 10000-ton return yoke made of construction steel. Accurate characterization of the magnetic field everywhere in the CMS detector is required. During two major tests of the CMS magnet the magnetic flux density was measured inside the coil in a cylinder of 3.448 m diameter and 7 m length with a specially designed field-mapping pneumatic machine as well as in 140 discrete regions of the CMS yoke with NMR probes, 3-D Hall sensors and flux-loops. A TOSCA 3-D model of the CMS magnet has been developed to describe the magnetic field everywhere outside the tracking volume measured with the field-mapping machine. A volume based representation of the magnetic field is used to provide the CMS simulation and reconstruction software with the magnetic field ...

  14. Russian institute receives CMS Gold Award

    CERN Multimedia

    Patrice Loïez

    2003-01-01

    The Snezhinsk All-Russian Institute of Scientific Research for Technical Physics (VNIITF) of the Russian Federal Nuclear Centre (RFNC) is one of twelve CMS suppliers to receive awards for outstanding performance this year. The CMS Collaboration took the opportunity of the visit to CERN of the Director of VNIITF and his deputy to present the CMS Gold Award, which the institute has received for its exceptional performance in the assembly of steel plates for the CMS forward hadronic calorimeter. This calorimeter consists of two sets of 18 wedge-shaped modules arranged concentrically around the beam-pipe at each end of the CMS detector. Each module consists of steel absorber plates with quartz fibres inserted into them. The institute developed a special welding technique to assemble the absorber plates, enabling a high-quality detector to be produced at relatively low cost.RFNC-VNIITF Director Professor Georgy Rykovanov (right), is seen here receiving the Gold Award from Felicitas Pauss, Vice-Chairman of the CMS ...

  15. CMS: Simulated Higgs production and decay

    CERN Multimedia

    David Barney

    2005-01-01

    This track is an example of simulated data modelled for the CMS detector on the Large Hadron Collider (LHC) at CERN, which will begin taking data in 2008. These graphics show two possible signatures that a Higgs boson may leave in the detector. As the Higgs will be very short-lived, it cannot be observed directly but rather its production is inferred from the products of its decay.

  16. CMS software distribution and installation systems: concepts, practical solutions and experience at Fermilab as a CMS tier 1 center

    International Nuclear Information System (INIS)

    The CMS Collaboration of 2000 scientists involves 150 institutions from 31 nations spread all over the world. CMS software system integration and release management is performed at CERN. Code management is based on CVS, with read or write access to the repository via a CVS server. Software configuration, release management tools (SCRAM) are being developed at CERN. Software releases are then distributed to regional centers, where the software is used by a local community for a wide variety of tasks, such as software development, detector simulation and reconstruction and physics analysis. Depending on specific application, the system environment and local hardware requirements, different approaches and tools are used for the CMS software installation at different places. This presentation describes concepts and practical solutions for a variety of ways of software distribution, with an emphasis on the CMS experience at Fermilab. Installation and usage of different models used for the production farm, for code development and for physics analysis are described

  17. The run control and monitoring system of the CMS experiment

    International Nuclear Information System (INIS)

    The CMS experiment at the LHC at CERN will start taking data in 2008. To configure, control and monitor the experiment during data-taking the Run Control and Monitoring System (RCMS) was developed. This paper describes the architecture and the technology used to implement the RCMS, as well as the deployment and commissioning strategy of this important component of the online software for the CMS experiment

  18. CMS celebrates the lowering of its final detector element

    CERN Multimedia

    2008-01-01

    In the early hours of the morning the final element of the Compact Muon Solenoid (CMS) detector began the descent into its underground experimental cavern in preparation for the start-up of CERN's Large Hadron Collider (LHC) this summer. This is a pivotal moment for the CMS collaboration, as the experiment is the first of its kind to be constructed above ground and then lowered, element by element, 100 metres below.

  19. art@CMS students' exhibition in Centre des Arts, ECOLINT

    CERN Multimedia

    CMS Communications Group; Geneva, Switzerland; Vaso Sideri

    2015-01-01

    This video documents the outcome of a science and art workshop with the participation of high-school students from the International School of Geneva (ECOLINT). The project was implemented in the framework of art@CMS, an education and outreach programme of the CMS experiment at CERN. In the video, the students present their artworks during the opening of their exhibition at the Centre des Arts of ECOLINT in Geneva.

  20. The CERN CMS Barrel Design team: J. Andre, M.-H. Bovard, G. Duthion, J.-P.Girod, J.-P. Grillet, P. Petiot, L. Veillet, T. de Visser, G. Waurick, H. Gerwig, A. Herve.

    CERN Multimedia

    Hubert Gerwig

    2000-01-01

    After 7 years of design, calculation and hard work the first barrel ring of CMS stands free in the surface hall of P5. 1200 tonnes of steel nearly 17m high and 15m in diamter. The width is 2.5 meter. The Ferris Wheel served as a jig to build up the 3-layered ring. At the end of the assembly the ring is separated from the jig by rotating the special corner pieces and then move the whole mass on air pads.

  1. Aufbau eines Teststandes zur Integration von Silizium-Streifenmodulen in den Vorwaertsbereich des CMS-Experimentes

    CERN Document Server

    Floßdorf, Alexander; Flügge, Günter; Pooth, Oliver

    2004-01-01

    The Large Hadron Collider at CERN will collide protons with energies of up to 14 TeV, thereby offering the opportunity to investigate a wide range of physics processes. One of the experiments designed for the analysis of these high energetic proton collisions is the Compact Muon Solenoid (CMS). For the measurement of charged particles’ tracks, CMS utilises a silicon strip tracker, which is completed by a tracker end cap on each side. Each of the end caps is built from sub-structures called petals, which comprise the silicon strip modules as well as steering and power supply circuits. The assembly of a petal is done at an integration test stand, at which all connections and readout channels are checked for proper operation. As the tracker will be operated at a temperature of -10°C, each completed petal has to undergo a long term test at low temperatures in which its functionality is monitored. This thesis describes the construction and operation of an integration and a long term test stand, and the results ...

  2. FRANCE AT CERN

    CERN Multimedia

    2003-01-01

    From 23 to 25 September, French industry exhibited products and technologies which are related to the field of particle physics. Twenty five companies presented their latest developments in electrical engineering, IT, vacuum & low temperature technologies, and civil engineering. Bernard Frois, Director of the Energy, Transport, and Environment Department of the French Ministry for Research and New Technologies inaugurated the exhibition on 23 September. To make the most of his visit, he also visited the assembly halls of CMS and ATLAS and the hall where the superconducting magnets for the LHC are tested. From left to right: Jean-Claude Brisson, ILO, Robert Aymar, designated CERN Director General, Françoise Le Moign, Assistant General Consul at Geneva, Alain Guillouët, Head of the economic mission in Switzerland, French Embassy, Thierry Boquien, Ubifrance, French agency for international development of companies, Bernard Frois, Director of the Department for Energy, Transport, and Environment of the Fre...

  3. The CMS Timing Control and Distribution System

    CERN Document Server

    Hegeman, Jeroen Guido; Behrens, Ulf; Branson, James; Chaze, Olivier; Cittolin, Sergio; Darlea, Georgiana Lavinia; Deldicque, Christian; Demiragli, Zeynep; Dobson, Marc; Erhan, Samim; Fulcher, Jonathan Richard; Gigi, Dominique; Glege, Frank; Gomez Ceballos, Guillelmo; Hansen, Magnus; Holzner, Andre Georg; Jimenez Estupinan, Raul; Masetti, Lorenzo; Meijers, Franciscus; Meschi, Emilio; Mommsen, Remigius; Morovic, Srecko; O'Dell, Vivian; Orsini, Luciano; Paus, Christoph Maria Ernst; Pieri, Marco; Racz, Attila; Sakulin, Hannes; Schwick, Christoph; Simelevicius, Dainius; Troska, Jan; Vichoudis, Paschalis; Zejdl, Petr

    2015-01-01

    The Compact Muon Solenoid (CMS) experiment operating at the CERN (European Laboratory for Nuclear Physics) Large Hadron Collider (LHC) is in the process of upgrading several of its detector systems. Adding more individual detector components brings the need to test and commission those components separately from existing ones so as not to compromise physics data-taking. The CMS Trigger, Timing and Control (TTC) system had reached its limits in terms of the number of separate elements (partitions) that could be supported. A new Timing and Control Distribution System (TCDS) has been designed, built and commissioned in order to overcome this limit. It also brings additional functionality to facilitate parallel commissioning of new detector elements. We describe the new TCDS system and its components and show results from the first operational experience with the TCDS system in CMS.

  4. Exploring the quality of latest sensor prototypes for the CMS Tracker Phase II Upgrade

    CERN Document Server

    Konig, Axel

    2016-01-01

    The LHC at CERN will reach its nominal luminosity soon. The luminosity will further be increased by a factor of five to seven during the third long shutdown (LS3) scheduled around 2024. The significant increase in luminosity along with the limitations of the current Tracker require a complete renewal of the CMS Outer Tracker, the Tracker Phase-2 Upgrade, during the LS3. New types of modules called PS and 2S modules are foreseen offering enhanced functionality and radiation hardness. Milestones in sensor R&D for the 2S modules as well as first characterization results are presented. AC-coupled silicon strip sensors of two vendors, produced on 6-inch as well as on 8-inch wafers, are considered which both feature the demanded n-in-p technology. Global as well as single strip parameters were measured providing insights into the quality of the sensors.

  5. HGCal Simulation Analyses for CMS

    CERN Document Server

    Bruno, Sarah Marie

    2015-01-01

    This summer, I approached the topic of fast-timing detection of photons from Higgs decays via simulation analyses, working under the supervision of Dr. Adolf Bornheim of the California Institute of Technology. My specific project focused on simulating the high granularity calorimeter for the Compact Muon Solenoid (CMS) experiment. CMS detects particles using calorimeters. The Electromagnetic Calorimeter (ECal) is arranged cylindrically to form a barrel section and two “endcaps.” Previously, both the barrel and endcap have employed lead tungstate crystal detectors, known as the “shashlik” design. The crystal detectors, however, rapidly degrade from exposure to radiation. This effect is most pronounced in the endcaps. To avoid the high expense of frequently replacing degraded detectors, it was recently decided to eliminate the endcap crystals in favor of an arrangement of silicon detectors known as the “High Granularity Calorimeter” (HGCal), while leaving the barrel detector technology unchanged. T...

  6. Moment of truth for CMS

    CERN Multimedia

    2006-01-01

    One of the first events reconstructed in the Muon Drift Tubes, the Hadron Calorimeter and elements of the Silicon Tracker (TK) at 3 Tesla. The atmosphere in the CMS control rooms was electric. Everbody was at the helm for the first full-scale testing of the experiment. This was a crunch moment for the entire collaboration. On Tuesday, 22 August the magnet attained almost its nominal power of 4 Tesla! At the same moment, in a tiny improvised control room, the physicists were keyed up to test the entire detector system for the first time. The first cosmic ray tracks appeared on their screens in the week of 15 August. The tests are set to continue for several weeks more until the first CMS components are lowered into their final positions in the cavern.

  7. Experience on 3D Silicon Sensors for ATLAS IBL

    CERN Document Server

    Darbo, Giovanni

    2015-01-01

    3D silicon sensors, where plasma micro-machining is used to etch deep narrow apertures in the silicon substrate to form electrodes of PIN junctions, represent possible solutions for inner pixel layers of the tracking detectors in high energy physics experiments. This type of sensors has been developed for the Insertable B-Layer (IBL), an additional pixel layer that has been installed in ATLAS during the present shutdown of the LHC collider at CERN. It is presented here the experience in designing, testing and qualifying sensors and detector modules that have been used to equip part of the IBL. Based on the gained experience with 3D silicon sensors for the ATLAS IBL, we discuss possible new developments for the upgrade of ATLAS and CMS at the high-luminosity LHC (HL-LHC).

  8. Charge Collection Efficiency Simulations of Irradiated Silicon Strip Detectors

    CERN Document Server

    Peltola, T

    2014-01-01

    During the scheduled high luminosity upgrade of LHC, the world's largest particle physics accelerator at CERN, the position sensitive silicon detectors installed in the vertex and tracking part of the CMS experiment will face more intense radiation environment than the present system was designed for. Thus, to upgrade the tracker to required performance level, comprehensive measurements and simulations studies have already been carried out. Essential information of the performance of an irradiated silicon detector is obtained by monitoring its charge collection efficiency (CCE). From the evolution of CCE with fluence, it is possible to directly observe the effect of the radiation induced defects to the ability of the detector to collect charge carriers generated by traversing minimum ionizing particles (mip). In this paper the numerically simulated CCE and CCE loss between the strips of irradiated silicon strip detectors are presented. The simulations based on Synopsys Sentaurus TCAD framework were performed ...

  9. Experience on 3D silicon sensors for ATLAS IBL

    International Nuclear Information System (INIS)

    3D silicon sensors, where plasma micro-machining is used to etch deep narrow apertures in the silicon substrate to form electrodes of PIN junctions, represent possible solutions for inner pixel layers of the tracking detectors in high energy physics experiments. This type of sensors has been developed for the Insertable B-Layer (IBL), an additional pixel layer that has been installed in ATLAS during the present shutdown of the LHC collider at CERN. It is presented here the experience in designing, testing and qualifying sensors and detector modules that have been used to equip part of the IBL. Based on the gained experience with 3D silicon sensors for the ATLAS IBL, we discuss possible new developments for the upgrade of ATLAS and CMS at the high-luminosity LHC (HL-LHC)

  10. Experience on 3D silicon sensors for ATLAS IBL

    Science.gov (United States)

    Darbo, G.

    2015-05-01

    3D silicon sensors, where plasma micro-machining is used to etch deep narrow apertures in the silicon substrate to form electrodes of PIN junctions, represent possible solutions for inner pixel layers of the tracking detectors in high energy physics experiments. This type of sensors has been developed for the Insertable B-Layer (IBL), an additional pixel layer that has been installed in ATLAS during the present shutdown of the LHC collider at CERN. It is presented here the experience in designing, testing and qualifying sensors and detector modules that have been used to equip part of the IBL. Based on the gained experience with 3D silicon sensors for the ATLAS IBL, we discuss possible new developments for the upgrade of ATLAS and CMS at the high-luminosity LHC (HL-LHC).

  11. Track reconstruction in CMS high luminosity environment

    CERN Document Server

    Goetzmann, Christophe

    2014-01-01

    The CMS tracker is the largest silicon detector ever built, covering 200 square meters and providing an average of 14 high-precision measurements per track. Tracking is essential for the reconstruction of objects like jets, muons, electrons and tau leptons starting from the raw data from the silicon pixel and strip detectors. Track reconstruction is widely used also at trigger level as it improves objects tagging and resolution.The CMS tracking code is organized in several levels, known as iterative steps, each optimized to reconstruct a class of particle trajectories, as the ones of particles originating from the primary vertex or displaced tracks from particles resulting from secondary vertices. Each iterative step consists of seeding, pattern recognition and fitting by a kalman filter, and a final filtering and cleaning. Each subsequent step works on hits not yet associated to a reconstructed particle trajectory.The CMS tracking code is continuously evolving to make the reconstruction computing load compat...

  12. EMC Diagnosis and Corrective Actions for Silicon Strip Tracker Detectors

    Energy Technology Data Exchange (ETDEWEB)

    Arteche, F.; /CERN /Imperial Coll., London; Rivetta, C.; /SLAC

    2006-06-06

    The tracker sub-system is one of the five sub-detectors of the Compact Muon Solenoid (CMS) experiment under construction at CERN for the Large Hadron Collider (LHC) accelerator. The tracker subdetector is designed to reconstruct tracks of charged sub-atomic particles generated after collisions. The tracker system processes analogue signals from 10 million channels distributed across 14000 silicon micro-strip detectors. It is designed to process signals of a few nA and digitize them at 40 MHz. The overall sub-detector is embedded in a high particle radiation environment and a magnetic field of 4 Tesla. The evaluation of the electromagnetic immunity of the system is very important to optimize the performance of the tracker sub-detector and the whole CMS experiment. This paper presents the EMC diagnosis of the CMS silicon tracker sub-detector. Immunity tests were performed using the final prototype of the Silicon Tracker End-Caps (TEC) system to estimate the sensitivity of the system to conducted noise, evaluate the weakest areas of the system and take corrective actions before the integration of the overall detector. This paper shows the results of one of those tests, that is the measurement and analysis of the immunity to CM external conducted noise perturbations.

  13. Scaling CMS data transfer system for LHC start-up

    CERN Document Server

    Tuura, L; Bonacorsi, D; Egeland, R; Feichtinger, D; Metson, S; Rehn, J

    2008-01-01

    The CMS experiment will need to sustain uninterrupted high reliability, high throughput and very diverse data transfer activities as the LHC operations start. PhEDEx, the CMS data transfer system, will be responsible for the full range of the transfer needs of the experiment. Covering the entire spectrum is a demanding task: from the critical high-throughput transfers between CERN and the Tier-1 centres, to high-scale production transfers among the Tier-1 and Tier-2 centres, to managing the 24/7 transfers among all the 170 institutions in CMS and to providing straightforward access to handful of files to individual physicists.

  14. CMS Records Schedule

    Data.gov (United States)

    U.S. Department of Health & Human Services — The CMS Records Schedule provides disposition authorizations approved by the National Archives and Records Administration (NARA) for CMS program-related records...

  15. CMS brochure (English version)

    CERN Multimedia

    Marcastel, Fabienne

    2014-01-01

    CMS is the heaviest detector at the LHC, the most powerful particle accelerator in the world, which has started up in 2008. A multi-purpose detector, CMS is composed of several systems built around a powerful superconducting magnet.

  16. CMS brochure (Spanish version)

    CERN Multimedia

    Lefevre, C

    2008-01-01

    CMS is the heaviest detector at the LHC, the most powerful particle accelerator in the world, which will start up in 2008. A multi-purpose detector, CMS is composed of several systems built around a powerful superconducting magnet.

  17. CMS brochure (Greek version)

    CERN Multimedia

    Lefèvre, C

    2006-01-01

    CMS is the heaviest detector at the LHC, the most powerful particle accelerator in the world, which will start up in 2008. A multi-purpose detector, CMS is composed of several systems built around a powerful superconducting magnet.

  18. CMS Program Statistics

    Data.gov (United States)

    U.S. Department of Health & Human Services — The CMS Office of Enterprise Data and Analytics has developed CMS Program Statistics, which includes detailed summary statistics on national health care, Medicare...

  19. CMS Tracker Integration: monitoring the process quality

    International Nuclear Information System (INIS)

    The CMS experiment at LHC features the largest Silicon Strip Tracker (SST) ever built. This detector is composed of about 15000 modules, thus the potential problems of the system comes from its complexity. This article covers the tests performed during the tracker integration, describing their motivations in terms of process quality assurance

  20. Bulgarians@cern.ch

    CERN Multimedia

    2000-01-01

    The happy Bulgarian family. From left to right, last row to first row: Ilka Antcheva, Georgi Antchev, Dimitri Borilkov, Ivana Hristova, Petiu Petev, Peicho Petkov, Borislav Pavlov, Peter Hristov, Mihail Tchijov, Stefan Piperov, Ekaterina Ivanova, Dimitar Kolev, Roumen Tzenov. Bobby is striding along with his white sneakers, black trousers belted high at the waist and a blue shirt buttoned up to the top. He comes to the coffee table and sits down on the chair crossing his legs. While speaking he fiddles with his glasses and his black curly hair dangles on the sides of his head. Borislav Pavlov or Bobby is a 22 year old Bulgarian summer Physics student at Sofia University and came to CERN to work on ORCA reconstruction software for the CMS experiment. “I will do my thesis on ORCA and it is so good that I can be here, work here where the projects actually happen and exchange experience with the people working here,” he says. “It is an honor for me.” Bulgaria joined CERN as a member state in 1999 but Bulgar...

  1. CMS 2006 - CMS France days; CMS 2006 les journees CMS FRANCE

    Energy Technology Data Exchange (ETDEWEB)

    Huss, D.; Dobrzynski, L.; Virdee, J.; Boudoule, G.; Fontaine, J.C.; Faure, J.L.; Paganini, P.; Mathez, H.; Gross, L.; Charlot, C.; Trunov, A.; Patois, Y.; Busson, P.; Maire, M.; Berthon, U.; Todorov, T.; Beaudette, F.; Sirois, Y.; Baffioni, S.; Beauceron, S.; Delmeire, E.; Agram, J.L.; Goerlach, U.; Mangeol, D.; Salerno, R.; Bloch, D.; Lassila-Perini, K.; Blaha, J.; Drobychev, G.; Gras, P.; Hagenauer, M.; Denegri, D.; Lounis, A.; Faccio, F.; Lecoq, J

    2006-07-01

    These CMS talks give the opportunity for all the teams working on the CMS (Compact Muon Spectrometer) project to present the status of their works and to exchange ideas. 5 sessions have been organized: 1) CMS status and perspectives, 2) contributions of the different laboratories, 3) software and computation, 4) physics with CMS (particularly the search for the Higgs boson), and 5) electronic needs. This document gathers the slides of the presentations.

  2. Preliminary Cluster Size and Efficiencies results of CMS RPC at GIF++

    CERN Document Server

    Gonzalez Blanco Gonzalez, Genoveva

    2016-01-01

    A brief description and first preliminary results of the Efficiencies and Cluster Size measurements of the CMS Resistive Plate Chambers, will be presented inside the Gamma Irradiation Facility GIF++ at CERN. Preliminary studies that sets the base performance measurements of CMS RPC for starting aging studies.

  3. CMS Comic Book Brochure

    CERN Multimedia

    2006-01-01

    To raise students' awareness of what the CMS detector is, how it was constructed and what it hopes to find. Titled "CMS Particle Hunter," this colorful comic book style brochure explains to young budding scientists and science enthusiasts in colorful animation how the CMS detector was made, its main parts, and what scientists hope to find using this complex tool.

  4. Hangout with CERN: Penguins! (S03E07)

    CERN Multimedia

    Kahle, Kate

    2013-01-01

    In this week's hangout scientists from the LHCb Experiment at CERN explain why their experiment is a place to find penguins! But these are no ordinary penguins, these are electroweak penguins, who got their name via a strange tale involving a game of darts...Host ATLAS physicist Steven Goldfarb is joined by LHCb physicist Tom Blake, with LHCb physicist Nico Serra and CERN Theorist Gilad Perez, and CMS physicist Freya Blekman monitoring social media.Read more about chasing new physics with electroweak penguins in the latest CERN Courier: http://cerncourier.com/cws/article/cern/53421Recorded live on 6th June 2013.

  5. CERN NEWS : HIGGS UPDATE 2011

    CERN Multimedia

    CERN video productions

    2011-01-01

    In a seminar held at CERN today, the ATLAS and CMS experiments presented the status of their searches for the Standard Model Higgs boson. Their results are based on the analysis of considerably more data than those presented at the summer conferences, sufficient to make significant progress in the search for the Higgs boson, but not enough to make any conclusive statement on the existence or non-existence of the elusive Higgs. The main conclusion is that the Standard Model Higgs boson, if it exists, is most likely to have a mass constrained to the range 116-130 GeV by the ATLAS experiment, and 115-127 GeV by CMS. Tantalising hints have been seen by both experiments in this mass region, but these are not yet strong enough to claim a discovery.

  6. CERN choir

    CERN Multimedia

    2004-01-01

    Don't forget a special performance of Joseph Haydn's Creation, an oratorio in three parts, given by the CERN choir and the Annecy choir Pro Musica, this Sunday at 8.30 p.m. at the Grand Casino. Tickets (38 CHF) are available at Fnac Rive and Balexert.

  7. Robot adventures at CERN

    CERN Multimedia

    2015-01-01

    Imagine if the CERN robots had an end-of-year party... From retrieving data tapes to handling material safely, the robots at CERN fulfill numerous tasks. Find out more: http://cern.ch/go/VjX7 Produced by: CERN Video Productions Director: Christoph M. Madsen Copyright © 2015 CERN. Terms of use: http://copyright.web.cern.ch/

  8. CMS outreach event to close LS1

    CERN Multimedia

    Achintya Rao

    2015-01-01

    CMS opened its doors to about 700 students from schools near CERN, who visited the detector on 16 and 17 February during the last major CMS outreach event of LS1.   Pellentesque sapien mi, pharetra vitae, auctor eu, congue sed, turpis. Enthusiastic CMS guides spent a day and a half showing the equally enthusiastic visitors, aged 10 to 18, the beauty of CMS and particle physics. The recently installed wheelchair lift was called into action and enabled a visitor who arrived on crutches to access the detector cavern unimpeded.  The CMS collaboration had previously devoted a day to school visits after the successful “Neighbourhood Days” in May 2014 and, encouraged by the turnout, decided to extend an invitation to local schools once again. The complement of nearly 40 guides and crowd marshals was aided by a support team that coordinated the transportation of the young guests and received them at Point 5, where a dedicated safety team including first-aiders, security...

  9. Commissioning the CMS pixel detector with Cosmic Rays

    CERN Document Server

    Heyburn, Bernadette

    2009-01-01

    The Compact Muon Solenoid (CMS) is one of two general purpose experiments at the Large Hadron Collider. The CMS experiment prides itself on an ambitious, all silicon based, tracking system. After almost 20 years of design and construction the CMS tracker detector has been installed and commissioned. The tracker detector consists of ten layers of silicon microstrip detectors while three layers of pixel detector modules are situated closest to the interaction point. The pixel detector consists of 66 million pixels of 100mm 150mm size, and is designed to use the shape of the actual charge distribution of charged particles to gain hit resolutions down to 12mm. This paper will focus on commissioning activities in the CMS pixel detector. Results from cosmic ray studies will be presented, in addition to results obtained from the integration of the pixel detector within the CMS detector and various calibration and alignment analyses.

  10. UK Minister enthusiastic after visit to CERN

    CERN Multimedia

    2008-01-01

    ON Tuesday 5 August the UK Secretary of State for Innovation, Universities and Skills, John Denham, came to CERN. The UK continues its strong links with CERN.The Minister was welcomed on arrival at CERN by Robert Aymar, the Director-General, and senior British scientists. Following a short presentation, he began a comprehensive tour of the Laboratory with a visit to both the LHC at point 5 and the CMS experiment. After lunch the Minister’s busy schedule continued, completing his overview of the main areas of UK participation at CERN. As soon as he had signed the guest book, he was whisked off to visit the LHCb experiment, the LHC computing grid project (LCG) and the ATLAS control room. However, the last item on his itinerary was perhaps the most illuminating. Meeting a diverse group of British scientists, from technical and summer students to staff members with more than 30 years of experience, the Minister had the opportunity...

  11. On 23 November, the Duke of York visited CERN and, in his capacity as the UK's Special Representative for International Trade and Investment, inaugurated the UK@CERN Exhibition.

    CERN Multimedia

    Patrice Loiez

    2004-01-01

    Pictures 01 & 02 : The Duke of York chats before inaugurating the UK@CERN exhibition. From left to right: Robert Aymar, CERN's Director General, the Duke of York, and leading UK scientists at CERN: Jim Virdee, CMS deputy spokeman; theorist John Ellis ; and Steve Myers, head of the AB Department.

  12. ETH Zurich tour at CERN.

    CERN Multimedia

    Maximilien Brice

    2002-01-01

    Right to left: Thomas Wobmann and Markus Zemp visit the LHC tunnel at CERN with G nther Dissertori and Marcel Wyler of ETH Zurich. Their visit was part of the top prize for a competition organised by the ETH department of physics to coincide with its open day in June. Residents of Zurich and surrounding Swiss cantons were invited to answer five physics questions broadcast on local radio and the Internet the week before the open day. The two winners' reward for knowing who did not believe that God plays dice, among other things, was a flight offered by Swiss International Air Lines to Geneva and a VIP tour of CERN. One highlight was a trip to the underground site of the future CMS experiment, where the scale of the enormous cavern makes construction machines look like children's toys.

  13. The CMS Reconstruction Software

    Science.gov (United States)

    Lange, David J.; CMS Collaboration

    2011-12-01

    We report on the status and plans for the event reconstruction software of the CMS experiment. The CMS reconstruction algorithms are the basis for a wide range of data analysis approaches currently under study by the CMS collaboration using the first high-energy run of the LHC. These algorithms have been primarily developed and validated using simulated data samples, and are now being commissioned with LHC proton-proton collision data samples. The CMS reconstruction is now operated routinely on all events triggered by the CMS detector, both in a close to real-time prompt reconstruction processing and in frequent passes over the full recorded CMS data set. We discuss the overall software design, development cycle, computational requirements and performance, recent operational performance, and planned improvements of the CMS reconstruction software.

  14. Production of the new pixel detector for the upgrade of the CMS experiment and study of anomalous couplings in the non-resonant Higgs bosons pair production in p-p collisions at $\\sqrt{s}$ = 13 TeV

    CERN Document Server

    Dall'Osso, Martino; Dorigo, Tommaso

    2016-01-01

    The present thesis work has been carried out in the framework of the CMS collaboration, one of the experiment designed to study the physics of the proton-proton collisionsat the Large Hadron Collider (LHC) at CERN.Experimentation at CMS (and at ATLAS) led to the discovery of a new particle in 2012which has been identified as the Higgs boson, the missing brick of the Standard Model ofthe fundamental interactions. All the experiments at LHC are upgrading their detectorsin order to fulfill the continuous increment of the LHC luminosity and the consequentincrement of the per collision event rate.The CMS upgrade project foresees, inter alia, the production of a new pixel detector(CMS Phase 1 Pixel Upgrade) to be commissioned at the beginning of 2017. Crucial partof the upgrade is the new readout chip (ROC) for the silicon sensor, psi46digV2respin,designed at the Paul Scherrer Institute (PSI) with a 250 nm CMOS technology. This chiprepresents the state of the art in the readout electronics for the silicon detecto...

  15. Etude des désintégrations radiatives Z$^0 \\rightarrow \\mu\\mu\\gamma$ et recherches du boson de Higgs dans le canal H$\\rightarrow \\gamma\\gamma$ dans l'expérience CMS au LHC (CERN)

    CERN Document Server

    Bondu, Olivier

    The Large Hadron Collider (LHC) at CERN (European Organisation for Nuclear Research) has been in operation since 2009 at the border between France and Switzerland. This particle accelerator has provided a significant quantity of proton-proton collisions, at center of mass energies of 7 TeV (2010 and 2011) and 8 TeV (since April 2012). One of the purposes of the Compact Muon Solenoid (CMS) experiment, which records and analyses those collisions, is the search for Higgs bosons. In the Standard Model, this particle would be the quantum of the Higgs field, thought to explain the electroweak symmetry-breaking mechanism. One of the most sensitive channels for the search for a light Higgs boson (i.e. for masses between 90 GeV=c2 and 150 GeV=c2) at the LHC is through its decay into two photons. Indeed, the production of two highly energetic and isolated photons in the final state is a clean signal in hadronic collisions, despite the small branching ratio. Moreover, at these masses, the width of the reconstructed inva...

  16. Detector Control System for CMS RPC at GIF++

    CERN Document Server

    Gul, Muhammad

    2016-01-01

    In the framework of the High Luminosity LHC upgrade program, the CMS muon groupbuilt several different RPC prototypes that are now under test at the new CERN Gamma Irradiation Facility (GIF++). A dedicated Detector Control System has been developed using the WinCC-OA tool to control and monitor these prototype detectors and to store the measured parameters data.

  17. Detector Control System for CMS RPC at GIF++

    CERN Document Server

    Gul, Muhammad

    2016-01-01

    In the framework of the High Luminosity LHC upgrade program, the CMS muon group built several different RPC prototypes that are now under test at the new CERN Gamma Irradiation Facility (GIF++). A dedicated Detector Control System has been developed using the WinCC-OA tool to control and monitor these prototype detectors and to store the measured parameters data.

  18. Construction of a drift chamber prototype for the CMS experiment

    International Nuclear Information System (INIS)

    General design features of a small size drift chamber prototype are described in this report. Prototype construction has taken place at CIEMAT and we explain in detail the assembly procedure. This activity is part of a long term project to mass produce chambers for the muon barrel detector of the CMS experiment which will be installed at CERN. (Author)

  19. CMS offline web tools

    International Nuclear Information System (INIS)

    We describe a relatively new effort within CMS to converge on a set of web based tools, using state of the art industry techniques, to engage with the CMS offline computing system. CMS collaborators require tools to monitor various components of the computing system and interact with the system itself. The current state of the various CMS web tools is described along side current planned developments. The CMS collaboration comprises of nearly 3000 people from all over the world. As well as its collaborators, its computing resources are spread all over globe and are accessed via the LHC grid to run analysis, large scale production and data transfer tasks. Due to the distributed nature of collaborators effective provision of collaborative tools is essential to maximise physics exploitation of the CMS experiment, especially when the size of the CMS data set is considered. CMS has chosen to provide such tools over the world wide web as a top level service, enabling all members of the collaboration to interact with the various offline computing components. Traditionally web interfaces have been added in HEP experiments as an afterthought. In the CMS offline we have decided to put web interfaces, and the development of a common CMS web framework, on an equal footing with the rest of the offline development. Tools exist within CMS to transfer and catalogue data (PhEDEx and DBS/DLS), run Monte Carlo production (ProdAgent) and submit analysis (CRAB). Effective human interfaces to these systems are required for users with different agendas and practical knowledge of the systems to effectively use the CMS computing system. The CMS web tools project aims to provide a consistent interface to all these tools

  20. Measurement of the CMS Magnetic Field

    CERN Document Server

    Klyukhin, V I; Bergsma, F; Campi, D; Curé, B; Gaddi, A; Gerwig, H; Hervé, A; Korienek, J; Linde, F; Lindenmeyer, C; Loveless, R; Mulders, M; Nebel, T; Smith, R P; Stickland, D; Teafoe, G; Veillet, L; Zimmerman, J K

    2011-01-01

    The measurement of the magnetic field in the tracking volume inside the superconducting coil of the Compact Muon Solenoid (CMS) detector under construction at CERN is done with a fieldmapper designed and produced at Fermilab. The fieldmapper uses 10 3-D B-sensors (Hall probes) developed at NIKHEF and calibrated at CERN to precision 0.05% for a nominal 4 T field. The precise fieldmapper measurements are done in 33840 points inside a cylinder of 1.724 m radius and 7 m long at central fields of 2, 3, 3.5, 3.8, and 4 T. Three components of the magnetic flux density at the CMS coil maximum excitation and the remanent fields on the steel-air interface after discharge of the coil are measured in check-points with 95 3-D B-sensors located near the magnetic flux return yoke elements. Voltages induced in 22 flux-loops made of 405-turn installed on selected segments of the yoke are sampled online during the entire fast discharge (190 s time-constant) of the CMS coil and integrated offline to provide a measurement of the...

  1. Member State Event: Telling CERN's Story

    CERN Multimedia

    2004-01-01

    As part of the events to mark the Laboratory's fiftieth anniversary, members of the CERN personnel are telling the story of CERN. Robert Cailliau (on the right of the photograph), co-inventor of the Web and currently responsible for CERN's external communications, and Chiara Mariotti (in the center), a physicist working at CMS, were invited to talk about the history of CERN and the Web at a conference in the 'Science Thursdays' series entitled 'From the Quark to the Web' in Turin on 26 February. This was not their first appearance before a non-specialist audience (almost 1000 people that day!) eager to find out what goes on in a unique research centre like CERN as talking about the Laboratory's activities and its history are part and parcel of their work for the Organization. Anniversary Events in the Member States: This 'Science Thursday' event devoted to CERN was one of Italy's contributions to CERN's fiftieth anniversary celebrations. Coming up soon in the Member States: Italy International Centre...

  2. CMS L1 Calorimeter Trigger performance in 2016 data

    CERN Document Server

    CMS Collaboration

    2016-01-01

    After the first long shutdown, the LHC has restarted at a centre-of-mass energy of 13 TeV. The LHC is expected to achieve an instantaneous luminosity larger than $10^{34}$ $\\mathrm{cm}^{-2}\\cdot\\mathrm{s}^{-1}$ and an average number of pile-up interactions of at least 40. The CMS Level-1 trigger architecture has undergone a full upgrade in order to maintain and improve the trigger performance under these new conditions. It will allow CMS to keep the trigger rate under control and to avoid a significant increase in trigger thresholds that would have a negative impact on the CMS physics program. First studies of the performance of the calorimeter trigger upgrade for electrons, photons, tau leptons, jets and energy sums are shown. Details of the algorithms and commissioning may be found in CMS-DP-2015-009, CMS-DP-2015-003, CMS-DP-2015-051 and the CMS Technical Design Report for the Level-1 Trigger upgrade: CERN-LHCC-2013-011, CMS-TDR-12 (2013).

  3. Chips for discovering the Higgs boson and other particles at CERN: Present and future

    CERN Document Server

    Snoeys, W

    2015-01-01

    Integrated circuits and devices revolutionized particle physics experiments, and have been essential in the recent discovery of the Higgs boson by the ATLAS and CMS experiments at the Large Hadron Collider at CERN [1,2]. Particles are accelerated and brought into collision at specific interaction points where detectors, giant cameras of about 40 m long by 20 m in diameter, take pictures of the collision products as they fly away from the collision point. These detectors contain millions of channels, often implemented as reverse biased silicon pin diode arrays covering areas of up to 200 m2 in the center of the experiment, generating a small (~1fC) electric charge upon particle traversals. Integrated circuits provide the readout, and accept collision rates of about 40 MHz with on-line selection of potentially interesting events before data storage. Important limitations are power consumption, radiation tolerance, data rates, and system issues like robustness, redundancy, channel-to-channel uniformity, timing d...

  4. Indian high-school students dive into particle physics at CERN

    CERN Multimedia

    CERN Bulletin

    2014-01-01

    CERN hosted its first group of high-school students from India in a week-long programme in June, with lectures, visits and hands-on activities that brought them a little closer to the world of particle physics. Abhishek Anand, whose internship with CMS coincided with this programme, documented his experience for the CMS blog (see here).   The students with CERN Director-General Rolf Heuer and Head of International Relations Rüdiger Voss.

  5. CMS geometry through 2020

    CERN Document Server

    Osborne, Ianna

    2013-01-01

    CMS faces real challenges with upgrade of the CMS detector through 2020. One of the challenges, from the software point of view, is managing upgrade simulations with the same software release as the 2013 scenario. We present the CMS geometry description software model, its integration with the CMS event setup and core software. The CMS geometry configuration and selection is implemented in Python. The tools collect the Python configuration fragments into a script used in CMS workflow. This flexible and automated geometry configuration allows choosing either transient or persistent version of the same scenario and specific version of the same scenario. We describe how the geometries are integrated and validated, how we define and handle different geometry scenarios in simulation and reconstruction. We discuss how to transparently manage multiple incompatible geometries in the same software release. Several examples are shown based on current implementation assuring consistent choice of scenario conditions. The...

  6. EU Commissioner for Research, Science and Innovation visits CERN

    CERN Multimedia

    Svetlomir Stavrev

    2015-01-01

    The EU Commissioner for Research, Science and Innovation, Carlos Moedas, visited CERN on 30 January 2015. He was invited by the Director-General to obtain a first-hand impression of some of the world's largest and most complex scientific instruments, just before the eagerly awaited restart of the LHC at record energies.   EU Commissioner Carlos Moedas (first row, fourth from right), accompanied by members of CERN management and researchers involved in the CESSAMag project. The Commissioner was informed about the missions and various activities of CERN, including knowledge transfer and technologies for medical applications. He visited CMS, some of the magnets developed by CERN for SESAME in the framework of the EU co-funded CESSAMag project, and the IT Computing Centre.  The Commissioner encouraged CERN to engage in a European Science Cloud Pilot that could be built on top of existing and highly successful distributed computing initiatives, in some of which CERN played a fu...

  7. Hangout with CERN: Lights, web-cam, action!

    CERN Multimedia

    Kate Kahle, CERN Social Media Manager

    2013-01-01

    Armed with laptops, CERN people answer questions live on YouTube every Thursday via "Hangout with CERN". Find out more and give feedback for the chance to win tickets to see comedian Eddie Izzard.   A snapshot from “Hangout with CERN: Higgs, the unanswered questions”. "Can you hear me?" "Your microphone is muted!" Most CERN people are familiar with the conveniences and challenges of video conferencing. Well, now CERN is using video chats known as “hangouts” as another way to reach the general public and answer their questions. Currently in its second series, the “Hangout with CERN” initiative is going strong, with thousands of people tuning in every week to find out more about CERN's activities. The idea of hangouts began in early 2012, when Achintya Rao from the CMS collaboration started to use them to engage with the public, following on from the award-winning ATLAS vir...

  8. The French Research Minister visits CERN

    CERN Multimedia

    2008-01-01

    On Friday, 6 June, the French Minister for Higher Education and Research, Valérie Pécresse, was welcomed by CERN Director-General, Robert Aymar. Robert Aymar accompanies Valérie Pécresse and Bernard Accoyer on a visit to CMS. A dozen physicists took part in the round-table discussion, including the Director-General, project leaders, deputy spokesmen, members of the experiments, CERN personnel and users.At first, the Minister was given a tour of the CMS experiment and the LHC tunnel, accompanied by the President of the French National Assembly, Bernard Accoyer. The delegation then took part in a round-table discussion. The main objective of the Minister’s visit was to obtain input on the organisation of large research infrastructures, based on information concerning CERN’s administrative and scientific configuration and the experiment collaborations. As J.-J. Blaising, Head of the PH Depa...

  9. Influence of Highly Ionising Events on the CMS APV25 Readout Chip

    CERN Document Server

    Bainbridge, R J

    2004-01-01

    The Compact Muon Solenoid (CMS) experiment is one of four large high energy physics experiments presently being constructed for operation at the Large Hadron Collider (LHC) facility at CERN, Geneva. The motivation for the LHC and its experiments is the large range of new physics expected at the TeV energy scale. The CMS Silicon Strip Tracker (SST) will play a major role in all physics searches, providing precision tracking within a hostile radiation environment. The SST readout system is based on the APV25 front-end chip, of which 73000 are needed to fully instrument the sub-detector. It is essential for the SST readout system to be of the highest quality in order to maximise the physics performance of the sub-detector. Therefore, a production test station has been developed to screen wafers, each containing several hundred APV25 chips, prior to the integration of individual die into the final readout system. Several hundred wafers have already been screened and the number of chips identified to be fully func...

  10. Study of the impact of environmental parameters on the operation of CMS RPCs

    CERN Document Server

    Assran, Yasser

    2011-01-01

    CMS (Compact Muon Solenoid) is a general purpose detector designed to run at the highest luminosity at Large Hadron Collider (LHC), CERN, Geneva, Switzerland. The muon system of the CMS experiment relies on Drift Tubes (DT), Cathode Strip Chambers (CSC) and Resistive Plate Chambers (RPC). RPCs are dedicated for the first level muon trigger and they are characterized by bakelite electrodes delimited in a specialized gas volume filled with operational gas mixture. This analysis has been done for the RPC chambers installed in CMS experiment at CERN. The Currents of CMS RPCs chambers are analyzed as a function of environmental parameters such as Temperature, Humidity and pressure, which are important for the operation of the muon detector system. A novel Neural Network approach has been used to analyze the data and to build a model using experimental measurements and combining the results of the simulations. Data from RPC Chambers in CMS experiment are taken and compared to the results from neural Network.

  11. Differential Top-Quark-Pair Cross Sections in pp Collisions at $\\sqrt{s} = 7$~TeV with CMS and Charge Multiplication in Highly-Irradiated Silicon Sensors

    CERN Document Server

    Lange, Jörn Christian; Klanner, Robert

    2013-01-01

    Modern particle-physics exp eriments like the ones at the Large Hadron Collider (LHC) are global and interdisciplinary endeavours comprising a variety of dierent elds. In this work, two dierent asp ects are dealt with: on the one hand a top-quark physics analysis and on the other hand research and development towards radiation- hard silicon tracking detectors. The high centre-of-mass energy and luminosity at the LHC allow for a detailed investigation of top-quark-pair ( t t ) pro duction prop erties. Normalised dierential t t cross sections 1 d t t dX are measured as a function of nine dierent kinematic variables X of the t t system, the top quarks and their decay pro ducts (b jets and leptons). The analysis is p erformed using data of proton-proton collisions at p s = 7 TeV recorded by the CMS exp eriment in 2011, corresp onding to an integrated luminosity of 5 fb 1 . A high-purity sample of t t events is selected according to the top ology of the lep- ton+jets decay channel. Lepton-selection and trigger eci...

  12. The cathode strip chamber data acquisition electronics for CMS

    Science.gov (United States)

    Bylsma, B. G.; Durkin, L. S.; Gilmore, J.; Gu, J.; Ling, T. Y.; Rush, C.

    2009-03-01

    Data Acquisition (DAQ) electronics for Cathode Strip Chambers (CSC) [CMS Collaboration, The Muon Project Technical Design Report, CERN/LHCC 97-32, CMS TDR3, 1997] in the Compact Muon Solenoid (CMS) [CMS Collaboration, The Compact Muon Solenoid Technical Proposal, CERN/LHCC 94-38, 1994] experiment at the Large Hadron Collider (LHC) [The LHC study group, The Large Hadron Collider: Conceptual Design, CERN/AC 1995-05, 1995] is described. The CSC DAQ system [B. Bylsma, et al., in: Proceedings of the Topical Workshop on Electronics for Particle Physics, Prague, Czech Republic, CERN-2007-007, 2007, pp. 195-198] includes on-detector and off-detector electronics, encompassing five different types of custom circuit boards designed to handle the high event rate at the LHC. The on-detector electronics includes Cathode Front End Boards (CFEB) [R. Breedon, et al., Nucl. Instr. and Meth. A 471 (2001) 340], which amplify, shape, store, and digitize chamber cathode signals; Anode Front End Boards (AFEB) [T. Ferguson, et al., Nucl. Instr. and Meth. A 539 (2005) 386], which amplify, shape and discriminate chamber anode signals; and Data Acquisition Motherboards (DAQMB), which controls the on-chamber electronics and the readout of the chamber. The off-detector electronics, located in the underground service cavern, includes Detector Dependent Unit (DDU) boards, which perform real time data error checking, electronics reset requests and data concentration; and Data Concentrator Card (DCC) boards, which further compact the data and send it to the CMS DAQ System [CMS Collaboration, The TriDAS Project Technical Design Report, Volume 2: Data Acquisition and High-level Trigger, CERN/LHCC 2002-26, 2002], and serve as an interface to the CMS Trigger Timing Control (TTC) [TTC system web.cern.ch/TTC/intro.html>] system. Application Specific Integrated Circuits (ASIC) are utilized for analogous signal processing on front end boards. Field Programmable Gate Arrays (FPGA) are utilized on all

  13. Polymicro technologies receives prestigious award from European Organization for Nuclear Research (CERN)

    CERN Multimedia

    2003-01-01

    The CMS Collaboration of CERN presented two awards today to Polymicro Technologies, LLC of Phoenix, AZ in appreciation of their achievements in the development and production of radiation resistant silica optical fibers for use in the CMS detector (1/2 page).

  14. CERN celebrating the Lowering of the final detector element for large Hadron Collider

    CERN Multimedia

    2008-01-01

    In the early hours of the morning the final element of the Compact Muon Solenoid (CMS) detector began the descent into its underground experimental cavern in preparation for the start-up of CERNs Large Hadron Collider (LHC) this summer. This is a pivotal moment for the CMS collaboration.

  15. First operational experience with the CMS Run Control System

    CERN Document Server

    Sakulin, Hannes

    2010-01-01

    The Run Control System of the Compact Muon Solenoid (CMS) experiment at CERN's new Large Hadron Collider (LHC) controls the sub-detector and central data acquisition systems and the high-level trigger farm of the experiment. It manages around 10000 applications that control custom hardware or handle the event building and the high-level trigger processing. The CMS Run Control System is a distributed Java system running on a set of Apache Tomcat servlet containers. Users interact with the system through a web browser. The paper presents the architecture of the CMS Run Control System and deals with operational aspects during the first phase of operation with colliding beams. In particular it focuses on performance, stability, integration with the CMS Detector Control System, integration with LHC status information and tools to guide the shifter.

  16. Members of the Forum Engelberg visit CERN

    CERN Multimedia

    Patrice Loïez

    2002-01-01

    The Forum Engelberg is an annual interdisciplinary conference held in Engelberg, Switzerland intended to act as an international platform for debate and exchange of views on key issues affecting scientific research, technology, economics and philosophy. Its President is Hubert Curien - former French Minister of Research and Space Research, and President of the CERN Council from 1994 to 1996. Photo 01: (left to right) Mrs Mireille Quirina; D. Denegri, Physics Coordinator, CMS experiment; and Mrs Marisa Jaconi at the CMS detector's assembly site. In the background is the CMS magnet system under construction. The red concentric rings are part of the barrel yoke, which returns the magnetic flux generated by the superconducting coil. Supported from the innermost barrel ring is the outer cylinder of the vacuum tank that will house the superconducting coil.

  17. UK @ CERN

    CERN Multimedia

    FI Department

    2008-01-01

    17 – 18 November 2008 9.00 a.m. - 5.00 p.m. on Monday 17 November 9.00 a.m. - 5.00 p.m. on Tuesday 18 November Individual meetings will take place in the technicians’ or engineers’ offices. The companies will contact relevant users/technicians but anyone wishing to arrange an appointment with a specific company can contact Caroline Laignel (mailto:caroline.laignel@cern.ch, tel. 73722). A list of the companies is available from all departmental secretariats and on the web at: http://fi-dep.web.cern.ch/fi-dep/structure/memberstates/exhibitions_visits.htm List of companies: 1. Caburn MDC Europe Ltd. 2. Croft Engineering Services 3. Cryox Ltd. 4. Goodfellow Cambridge Ltd. 5. Gravatom Engineering Systems Ltd. 6. High Voltage Technology 7. Lilco Ltd. 8. Micro Metalsmiths Ltd. 9. Photek Ltd. 10. Shadow Robot Company 11. Sundance Multiprocessor Technology Ltd. 12. Tessella plc 13. Thermal Resources Management Ltd. 14. Torr Scientific Ltd. For further information please contact Mrs C. Laignel, FI-DI, tel. 7372...

  18. CERN moves to http://home.cern

    CERN Multimedia

    2015-01-01

    A new top-level domain for CERN will be inaugurated next week, with the migration of the core website to http://home.cern.   The new home.cern webpage. The .cern top-level domain is intended for the exclusive use of CERN and its affiliates, and will soon be open for applications from within the community. Clear governance mechanisms for registration and management of .cern domains have been put in place. Applications for domains may be submitted by current members of the CERN personnel, and must be sponsored by a CERN entity such as a department, experiment, project or CERN-recognised experiment. For more information please refer to the registration policy. The acquisition of the .cern top-level domain was negotiated via ICANN’s new gTLD programme by a board comprising members of the CERN Legal Service, Communications group and IT department. .cern is one of over 1,300 new top-level domains that will launch over the coming months and years. The .cern domain nam...

  19. Inserting the CMS solenoid

    CERN Multimedia

    Maximilien Brice

    2005-01-01

    The huge superconducting solenoid for CMS is inserted into the cryostat barrel. CMS uses the world's largest thin solenoid, in terms of energy stored, and is 12 m long, with a diameter of 6 m and weighing 220 tonnes. When turned on the magnet will produce a field strength of 4 T using superconducting niobium-titanium material at 4.5 K.

  20. Status of CMS and First Collider Results

    International Nuclear Information System (INIS)

    Since November 2009 the new Large Hadron Collider (LHC) at CERN has resumed operation delivering the first p-p collisions at 7 TeV on the 30th of March 2010. The CMS detector is registering data with a prospect to integrate 1 pb-1 of luminosity in a few months. The detector systems show excellent performances and many physics objects are already commissioned. First results on detector performance and physics, including also the 0.9 and 2.36 TeV pilot runs, are presented.

  1. CMS OnlineWeb-Based Monitoring

    CERN Document Server

    Wan, Zongru; Chakaberia, Irakli; Lopez-Perez, Juan Antonio; Maeshima, Kaori; Maruyama, Sho; Soha, Aron; Sulmanas, Balys; Wan, Zongru

    2012-01-01

    For large international High Energy Physics experiments, modern web technologies make the online monitoring of detector status, data acquisition status, trigger rates, luminosity, etc., accessible for the collaborators anywhere and anytime. This helps the collaborating experts monitor the status of the experiment, identify the problems, and improve data-taking efficiency. We present the Web-Based Monitoring project of the CMS experiment at the LHC of CERN. The data sources are relational databases and various messaging systems. The project provides a vast amount of in-depth information including real time data, historical trend, and correlations, in a user friendly way.

  2. CMS muon system upgrade during LS1

    CERN Document Server

    Giannini, Leonardo

    2014-01-01

    The aim of this report is sharing my experience as a Summer Student at CERN. It is addressed mainly to future Summer Students and young people interested in science. In the introduction a brief description of the CMS muon system is given. The next two paragraphs provide more details about the two type of detectors I could work on and about my work as a Summer Student. The main activities I was involved in were Quality Control in RPC production and starting a DCS for the new GEM production facility. Finally an evaluation of the whole experience is made.

  3. Recent results of the CMS experiment

    OpenAIRE

    Dorigo Tommaso

    2014-01-01

    The CMS experiment obtained a large number of groundbreaking results from the analysis of 7- and 8-TeV proton-proton collisions produced so far by the Large Hadron Collider at CERN. In this brief summary only a sample of those results will be discussed. A new particle with mass mH = 125.3 ± 0.4(stat.) ± 0.5(syst.) GeV and characteristics compatible with those expected for a standard model Higgs boson has been observed in its decays to photon pairs, WW pairs, and ZZ pairs. Searches for the rar...

  4. Understanding the performance of CMS calorimeter

    Indian Academy of Sciences (India)

    Seema Sharma; on behalf of the CMS Collaboration

    2007-12-01

    The performance of the CMS hadron calorimeter is studied using test beam facilities at CERN. Two wedges of brass-scintillator calorimeter are exposed to negative and positive beams with momenta between 3 and 300 GeV/c. Light produced in the scintillators are collected using wavelength shifting fibres and read out using hybrid photo-diodes. Each of the wedges has 17 layers of scintillators. In one of these wedges signal from all 17 layers are grouped together while in the other each layer is read out separately. The response, energy resolution, longitudinal and lateral shower profiles are measured.

  5. CMS: Higgs boson decays to four muons

    CERN Multimedia

    Taylor, Lucas

    1997-01-01

    This track is an example of simulated data modelled for the CMS detector on the Large Hadron Collider (LHC) at CERN, which will begin taking data in 2008. The Higgs boson is produced in the collision of two protons at 14 TeV and quickly decays into four muons, a type of heavy electron which is not absorbed by the detector. The tracks of the other products of the collision are shown by lines and the energy deposited in the detector is shown in blue. Image creator : Lucas Taylor.

  6. Interview Rolf Heuer, CERN Director general, on the Higgs searches results at the LHC (GERMAN VERSION)

    CERN Multimedia

    CERN Visual Media Office

    2012-01-01

    Rolf Heuer, CERN Director General, answers in GERMAN to questions on the results of the Higgs searches at ATLAS and CMS, July 4 2012, his personal feelings of the importance of the results and its implications on CERN and particle physics.

  7. Alignment strategy for the CMS Tracker

    CERN Document Server

    Weber, M

    2008-01-01

    The CMS Tracker measures the momentum of charged particles created in proton-proton interactions with 14\\,TeV nominal center-of-mass energy close to the interaction region. Its excellent single-point position resolution of 9--60\\,$\\mu$m\\ is far below typical construction tolerances, and together with its high granularity renders the alignment a demanding task, which needs to aim at micro-meter level precision. A strategy to align the CMS tracker with its 15\\,148 silicon strip and 1\\,440 silicon pixel modules, starting from survey measurements during construction, incorporating information from the laser hardware monitoring system and finally using collision and non-collision tracks for highest precision has been developed and is detailed in this article.

  8. CERN OVERVIEW animation

    CERN Multimedia

    Arzur Catel Torres

    2015-01-01

    This animation shows how the Large Hadron Collider (LHC) works. The film begins with an aerial view of CERN near Geneva, with outlines of the accelerator complex, including the underground Large Hadron Collider (LHC), 27-km in circumference. The positions of the four largest LHC experiments, ALICE, ATLAS, CMS and LHCb are revealed before we see protons travelling around the LHC ring. The proton source is a simple bottle of hydrogen gas. An electric field is used to strip hydrogen atoms of their electrons to yield protons. Linac 2, the first accelerator in the chain, accelerates the protons to the energy of 50 MeV. The beam is then injected into the Proton Synchrotron Booster (PSB), which accelerates the protons to 1.4 GeV, followed by the Proton Synchrotron (PS), which pushes the beam to 25 GeV. Protons are then sent to the Super Proton Synchrotron (SPS) where they are accelerated to 450 GeV. The protons are finally transferred to the two beam pipes of the LHC. The beam in one pipe circulates clockwise while ...

  9. Cryogenic Silicon Microstrip Detector Modules for LHC

    CERN Document Server

    Perea-Solano, B

    2004-01-01

    CERN is presently constructing the LHC, which will produce collisions of 7 TeV protons in 4 interaction points at a design luminosity of 1034 cm-2 s-1. The radiation dose resulting from the operation at high luminosity will cause a serious deterioration of the silicon tracker performance. The state-of-art silicon microstrip detectors can tolerate a fluence of about 3 1014 cm-2 of hadrons or charged leptons. This is insufficient, however, for long-term operation in the central parts of the LHC trackers, in particular after the possible luminosity upgrade of the LHC. By operating the detectors at cryogenic temperatures the radiation hardness can be improved by a factor 10. This work proposes a cryogenic microstrip detector module concept which has the features required for the microstrip trackers of the upgraded LHC experiments at CERN. The module can hold an edgeless sensor, being a good candidate for improved luminosity and total cross-section measurements in the ATLAS, CMS and TOTEM experiments. The design o...

  10. New links between Ecuador and CERN

    CERN Multimedia

    CERN Bulletin

    2011-01-01

    A new protocol recently signed in Quito opens the way to stronger links between the Ecuadorian scientific community and CERN. The operational framework provided by the protocol will enable scientists from Ecuador to take part in CERN’s projects, supported by the Ecuadorian authorities.   Picture taken during the signing ceremony at SENESCYT (Quito, Ecuador) on 12 July 2011. From left to right: Guillermo Solórzano, Minister for Coordination of Knowledge and Human Talent, Rene Ramirez Gallegos, National Secretary for Higher Education, Science and Technology - SENECYT, Felicitas Pauss and Jose Salicio from CERN. Ecuador’s involvement with CERN dates back to 1999 when a first International Co-operation Agreement was signed. However, despite these early beginnings,   only a few scientists from Ecuador, affiliated to non-Ecuadorian institutes, have since been directly involved in CERN’s projects, in particular the CMS experiment a...

  11. Three years of digital photogrammetry at CERN

    International Nuclear Information System (INIS)

    The LHC (Large Hadron Collider) is the new particle accelerator project at CERN (European Laboratory for Particle Physics) in Geneva. It will be a 27 km long accelerator made of superconducting magnets. Four big physics detectors: ALICE, ATLAS, CMS, LHC-B, will be installed at four points around it. With this project, new survey requirements appear together with new spatial and time scale constraints. In order to respond to the demand, the CERN Positioning Metrology Group decided to expand its tool box by buying digital photogrammetric equipment three years ago. Basically this equipment consist of Kodak DCS460 cameras and of the Rollei-CDW (Close-range Digital Workstation) software. This system has been used quite extensively since its purchase. The next chapters illustrate the reasons for the choice of the digital photogrammetry tool at CERN and the evolution of its use. Some adapted tooling is also described below. (authors)

  12. CMS Create #2 | 3-4 October | Register now!

    CERN Multimedia

    2016-01-01

    CMS Create brings together CERN members and students from IPAC Design Genève (see here). The goal is to build a prototype exhibit illustrating what CMS does and how it does it. The exhibit will introduce the world of a particle physics detector to the general public, and to younger visitors in particular.    CMS Create, hosted by IdeaSquare, was first held in November 2015. There were 4 highly diverse teams made of participants from many educational backgrounds and from 15 nationalities. 36% of these were women; a figure we hope will grow this year. The 25 participants were CMS physicists, computer scientists, engineers, other CMS collaborators and IPAC students. The 2015 winning exhibit is now permanently installed in the visitor reception centre at CMS Point 5, which was visited by 20.600 visitors during 2015. Are you creative and motivated to share your ideas?  Take part in CMS Create #2, meet with scientists and designers from all over the world and explain to CER...

  13. CMS tracker slides into centre stage

    CERN Multimedia

    2006-01-01

    As preparations for the magnet test and cosmic challenge get underway, a prototype tracker has been carefully inserted into the centre of CMS. The tracker, in its special platform, is slowly inserted into the centre of CMS. The CMS prototype tracker to be used for the magnet test and cosmic challenge coming up this summer has the same dimensions -2.5 m in diameter and 6 m in length- as the real one and tooling exactly like it. However, the support tube is only about 1% equipped, with 2 m2 of silicon detectors installed out of the total 200 m2. This is already more than any LEP experiment ever used and indicates the great care needed to be taken by engineers and technicians as these fragile detectors were installed and transported to Point 5. Sixteen thousand silicon detectors with a total of about 10 million strips will make up the full tracker. So far, 140 modules with about 100 000 strips have been implanted into the prototype tracker. These silicon strips will provide precision tracking for cosmic muon...

  14. The cathode strip chamber data acquisition electronics for CMS

    International Nuclear Information System (INIS)

    Data Acquisition (DAQ) electronics for Cathode Strip Chambers (CSC) [CMS Collaboration, The Muon Project Technical Design Report, CERN/LHCC 97-32, CMS TDR3, 1997] in the Compact Muon Solenoid (CMS) [CMS Collaboration, The Compact Muon Solenoid Technical Proposal, CERN/LHCC 94-38, 1994] experiment at the Large Hadron Collider (LHC) [The LHC study group, The Large Hadron Collider: Conceptual Design, CERN/AC 1995-05, 1995] is described. The CSC DAQ system [B. Bylsma, et al., in: Proceedings of the Topical Workshop on Electronics for Particle Physics, Prague, Czech Republic, CERN-2007-007, 2007, pp. 195-198] includes on-detector and off-detector electronics, encompassing five different types of custom circuit boards designed to handle the high event rate at the LHC. The on-detector electronics includes Cathode Front End Boards (CFEB) [R. Breedon, et al., Nucl. Instr. and Meth. A 471 (2001) 340], which amplify, shape, store, and digitize chamber cathode signals; Anode Front End Boards (AFEB) [T. Ferguson, et al., Nucl. Instr. and Meth. A 539 (2005) 386], which amplify, shape and discriminate chamber anode signals; and Data Acquisition Motherboards (DAQMB), which controls the on-chamber electronics and the readout of the chamber. The off-detector electronics, located in the underground service cavern, includes Detector Dependent Unit (DDU) boards, which perform real time data error checking, electronics reset requests and data concentration; and Data Concentrator Card (DCC) boards, which further compact the data and send it to the CMS DAQ System [CMS Collaboration, The TriDAS Project Technical Design Report, Volume 2: Data Acquisition and High-level Trigger, CERN/LHCC 2002-26, 2002], and serve as an interface to the CMS Trigger Timing Control (TTC) [TTC system ] system. Application Specific Integrated Circuits (ASIC) are utilized for analogous signal processing on front end boards. Field Programmable Gate Arrays (FPGA) are utilized on all boards in the system to provide

  15. CMS analysis school model

    International Nuclear Information System (INIS)

    To impart hands-on training in physics analysis, CMS experiment initiated the concept of CMS Data Analysis School (CMSDAS). It was born over three years ago at the LPC (LHC Physics Centre), Fermilab and is based on earlier workshops held at the LPC and CLEO Experiment. As CMS transitioned from construction to the data taking mode, the nature of earlier training also evolved to include more of analysis tools, software tutorials and physics analysis. This effort epitomized as CMSDAS has proven to be a key for the new and young physicists to jump start and contribute to the physics goals of CMS by looking for new physics with the collision data. With over 400 physicists trained in six CMSDAS around the globe, CMS is trying to engage the collaboration in its discovery potential and maximize physics output. As a bigger goal, CMS is striving to nurture and increase engagement of the myriad talents, in the development of physics, service, upgrade, education of those new to CMS and the career development of younger members. An extension of the concept to the dedicated software and hardware schools is also planned, keeping in mind the ensuing upgrade phase.

  16. CMS Analysis School Model

    Energy Technology Data Exchange (ETDEWEB)

    Malik, S. [Nebraska U.; Shipsey, I. [Purdue U.; Cavanaugh, R. [Illinois U., Chicago; Bloom, K. [Nebraska U.; Chan, Kai-Feng [Taiwan, Natl. Taiwan U.; D' Hondt, J. [Vrije U., Brussels; Klima, B. [Fermilab; Narain, M. [Brown U.; Palla, F. [INFN, Pisa; Rolandi, G. [CERN; Schörner-Sadenius, T. [DESY

    2014-01-01

    To impart hands-on training in physics analysis, CMS experiment initiated the concept of CMS Data Analysis School (CMSDAS). It was born over three years ago at the LPC (LHC Physics Centre), Fermilab and is based on earlier workshops held at the LPC and CLEO Experiment. As CMS transitioned from construction to the data taking mode, the nature of earlier training also evolved to include more of analysis tools, software tutorials and physics analysis. This effort epitomized as CMSDAS has proven to be a key for the new and young physicists to jump start and contribute to the physics goals of CMS by looking for new physics with the collision data. With over 400 physicists trained in six CMSDAS around the globe, CMS is trying to engage the collaboration in its discovery potential and maximize physics output. As a bigger goal, CMS is striving to nurture and increase engagement of the myriad talents, in the development of physics, service, upgrade, education of those new to CMS and the career development of younger members. An extension of the concept to the dedicated software and hardware schools is also planned, keeping in mind the ensuing upgrade phase.

  17. Slowly does it as giant magnet goes underground at CERN

    CERN Document Server

    2007-01-01

    "At 5:00 am GMT this morning the heaviest piece of the Compact Muon Solenoid (CMS) particle detector began a momentous journey into its experimental cavern, 100 metres undergound at CERN, Geneva. You can watch it on th webcam link." (1,5 page)

  18. Jeff FROST, video artist for U2, visits CERN

    CERN Multimedia

    2015-01-01

    Video artist Jeff Frost came to CERN last April to produce video art for the U2 band's 2015 tour Innocence and Experience. He spent a week and visited in The Globe, the ATLAS, CMS experiments and ALICE caverns, Idea Square, the COMPASS experiment, the AD, the Aegis experiment, n-ToF, LEIR, ISOLDE, SM18, the Computing Centre.

  19. The bakelite for the RPCs of the experiment CMS

    OpenAIRE

    Altieri, S.; Bruno, Giacomo Luca

    2000-01-01

    Results from aging tests on the bakelite used for the CMS RPCs are presented. Samples of melaminic bakelite were exposed to a heavy gamma and neutron radiation. Data on the bulk resistivity were collected while accumulating gamma and neutron doses and particles fluence up to values well beyond those expected in 10 years of RPCs operation in the barrel region of CMS. The test with gamma radiation was performed at the CERN Gamma Irradiation Facility (GIF) with a 20 Ci 137Cs source. A total abso...

  20. CMS tracker visualization tools

    CERN Document Server

    Zito, G; Osborne, I; Regano, A

    2005-01-01

    This document will review the design considerations, implementations and performance of the CMS Tracker Visualization tools. In view of the great complexity of this sub-detector (more than 50 millions channels organized in 16540 modules each one of these being a complete detector), the standard CMS visualization tools (IGUANA and IGUANACMS) that provide basic 3D capabilities and integration within CMS framework, respectively, have been complemented with additional 2D graphics objects. Based on the experience acquired using this software to debug and understand both hardware and software during the construction phase, we propose possible future improvements to cope with online monitoring and event analysis during data taking.

  1. CMS tracker visualization tools

    Energy Technology Data Exchange (ETDEWEB)

    Mennea, M.S. [Dipartimento Interateneo di Fisica ' Michelangelo Merlin' e INFN sezione di Bari, Via Amendola 173 - 70126 Bari (Italy); Osborne, I. [Northeastern University, 360 Huntington Avenue, Boston, MA 02115 (United States); Regano, A. [Dipartimento Interateneo di Fisica ' Michelangelo Merlin' e INFN sezione di Bari, Via Amendola 173 - 70126 Bari (Italy); Zito, G. [Dipartimento Interateneo di Fisica ' Michelangelo Merlin' e INFN sezione di Bari, Via Amendola 173 - 70126 Bari (Italy)]. E-mail: giuseppe.zito@ba.infn.it

    2005-08-21

    This document will review the design considerations, implementations and performance of the CMS Tracker Visualization tools. In view of the great complexity of this sub-detector (more than 50 millions channels organized in 16540 modules each one of these being a complete detector), the standard CMS visualization tools (IGUANA and IGUANACMS) that provide basic 3D capabilities and integration within CMS framework, respectively, have been complemented with additional 2D graphics objects. Based on the experience acquired using this software to debug and understand both hardware and software during the construction phase, we propose possible future improvements to cope with online monitoring and event analysis during data taking.

  2. CMS tracker visualization tools

    Science.gov (United States)

    Mennea, M. S.; Osborne, I.; Regano, A.; Zito, G.

    2005-08-01

    This document will review the design considerations, implementations and performance of the CMS Tracker Visualization tools. In view of the great complexity of this sub-detector (more than 50 millions channels organized in 16540 modules each one of these being a complete detector), the standard CMS visualization tools (IGUANA and IGUANACMS) that provide basic 3D capabilities and integration within CMS framework, respectively, have been complemented with additional 2D graphics objects. Based on the experience acquired using this software to debug and understand both hardware and software during the construction phase, we propose possible future improvements to cope with online monitoring and event analysis during data taking.

  3. CMS tracker visualization tools

    International Nuclear Information System (INIS)

    This document will review the design considerations, implementations and performance of the CMS Tracker Visualization tools. In view of the great complexity of this sub-detector (more than 50 millions channels organized in 16540 modules each one of these being a complete detector), the standard CMS visualization tools (IGUANA and IGUANACMS) that provide basic 3D capabilities and integration within CMS framework, respectively, have been complemented with additional 2D graphics objects. Based on the experience acquired using this software to debug and understand both hardware and software during the construction phase, we propose possible future improvements to cope with online monitoring and event analysis during data taking

  4. GEM based detector for future upgrade of the CMS forward muon system

    Energy Technology Data Exchange (ETDEWEB)

    Abbaneo, D.; Armagnaud, C. [CERN Physics Department, CERN, Geneva (Switzerland); Abbrescia, M. [Politecnico di Bari, Università di Bari (Italy); INFN Sezione di Bari, Bari (Italy); Aspell, P.; Bally, S. [CERN Physics Department, CERN, Geneva (Switzerland); Ban, Y. [Peking University, Beijing (China); Benussi, L. [Labortori Nazionali di Frascati INFN, Frascati (Italy); Berzano, U. [CERN Physics Department, CERN, Geneva (Switzerland); Bianco, S. [Labortori Nazionali di Frascati INFN, Frascati (Italy); Bos, J.; Bunkowski, K. [CERN Physics Department, CERN, Geneva (Switzerland); Cai, J. [Peking University, Beijing (China); Chatelain, J.P.; Christiansen, J. [CERN Physics Department, CERN, Geneva (Switzerland); Colafranceschi, S., E-mail: stefano.colafranceschi@cern.ch [CERN Physics Department, CERN, Geneva (Switzerland); Colaleo, A. [Politecnico di Bari, Università di Bari (Italy); INFN Sezione di Bari, Bari (Italy); Conde Garcia, A.; David, E.; De Oliveira, R. [CERN Physics Department, CERN, Geneva (Switzerland); Robertis, G. de [Politecnico di Bari, Università di Bari (Italy); INFN Sezione di Bari, Bari (Italy); and others

    2013-08-01

    In view of an upgrade of the CMS experiment, the GEM for CMS collaboration is performing feasibility studies on employing Triple-GEM detectors for the high-η region (1.6–2.4) of the CMS endcaps. A detailed review of the development and characterization of the CMS full-size prototype baseline detector will be presented. GEMs have excellent spatial and time resolution, high rate capability and radiation hardness, they are an appealing option for simultaneously enhancing muon tracking and triggering capabilities in the high-η region. The GEM for CMS collaboration has studied the performance of small and full-size prototype detectors during several test beam campaigns in order to validate new technologies and techniques in view of a mass production for CMS experiment. Results from measurements with x-rays and from test beam campaigns at the CERN SPS will be shown from both small and large prototypes.

  5. GEM based detector for future upgrade of the CMS forward muon system

    International Nuclear Information System (INIS)

    In view of an upgrade of the CMS experiment, the GEM for CMS collaboration is performing feasibility studies on employing Triple-GEM detectors for the high-η region (1.6–2.4) of the CMS endcaps. A detailed review of the development and characterization of the CMS full-size prototype baseline detector will be presented. GEMs have excellent spatial and time resolution, high rate capability and radiation hardness, they are an appealing option for simultaneously enhancing muon tracking and triggering capabilities in the high-η region. The GEM for CMS collaboration has studied the performance of small and full-size prototype detectors during several test beam campaigns in order to validate new technologies and techniques in view of a mass production for CMS experiment. Results from measurements with x-rays and from test beam campaigns at the CERN SPS will be shown from both small and large prototypes

  6. UK @ CERN

    CERN Multimedia

    FI Department

    2008-01-01

    17 – 18 November 2008 9.00 a.m. - 5.00 p.m. on Monday 17 November 9.00 a.m. - 5.00 p.m. on Tuesday 18 November Individual meetings will take place in the technicians’ or engineers’ offices. The companies will contact relevant users/technicians but anyone wishing to arrange an appointment with a specific company can contact Caroline Laignel (caroline.laignel@cern.ch, tel. 73722). A list of the companies is available from all departmental secretariats and on the web here. List of companies: 1. Caburn MDC Europe Ltd. 2. Croft Engineering Services 3. Cryox Ltd. 4. Goodfellow Cambridge Ltd. 5. Gravatom Engineering Systems Ltd. 6. High Voltage Technology 7. Lilco Ltd. 8. Micro Metalsmiths Ltd. 9. Photek Ltd. 10. Shadow Robot Company 11. Sundance Multiprocessor Technology Ltd. 12. Tessella plc 13. Thermal Resources Management Ltd. 14. Torr Scientific Ltd. For further information please contact Mrs C. Laignel, FI-DI, tel. 73722.

  7. CMS Financial Reports

    Data.gov (United States)

    U.S. Department of Health & Human Services — This section contains the annual CMS financial statements as required under the Chief Financial Officers (CFO) Act of 1990 (P.L. 101-576). The CFO Act marked a...

  8. CMS Space Monitoring

    Energy Technology Data Exchange (ETDEWEB)

    Ratnikova, N. [Fermilab; Huang, C.-H. [Fermilab; Sanchez-Hernandez, A. [CINVESTAV, IPN; Wildish, T. [Princeton U.; Zhang, X. [Beijing, Inst. High Energy Phys.

    2014-01-01

    During the first LHC run, CMS stored about one hundred petabytes of data. Storage accounting and monitoring help to meet the challenges of storage management, such as efficient space utilization, fair share between users and groups and resource planning. We present a newly developed CMS space monitoring system based on the storage metadata dumps produced at the sites. The information extracted from the storage dumps is aggregated and uploaded to a central database. A web based data service is provided to retrieve the information for a given time interval and a range of sites, so it can be further aggregated and presented in the desired format. The system has been designed based on the analysis of CMS monitoring requirements and experiences of the other LHC experiments. In this paper, we demonstrate how the existing software components of the CMS data placement system, PhEDEx, have been re-used, dramatically reducing the development effort.

  9. CMS Collaboration Board Meeting

    CERN Multimedia

    Hoch, Michael

    2013-01-01

    The first CMS Collaboration Board meeting of the year (2013) provided an opportunity to thank Teresa Rodrigo, Matthias Kasemann and Randy Ruchti, the 2011-12 CB Chair, Deputy Chair and Secretary, respectively.

  10. CMS Statistics Reference Booklet

    Data.gov (United States)

    U.S. Department of Health & Human Services — The annual CMS Statistics reference booklet provides a quick reference for summary information about health expenditures and the Medicare and Medicaid health...

  11. CMS Phase II Upgrade Scope Document

    CERN Document Server

    Butler, J; Klute, M; Mans, J; Silvestris, L; on behalf of the CMS, Collaboration; CERN. Geneva. The LHC experiments Committee; LHCC

    2015-01-01

    The High-Luminosity LHC (HL-LHC) has been identified as the highest priority program in High Energy Physics by both the European Strategy Group and the US Particle Physics Project Prioritization Panel. To fulfil the full potential of this program, which includes the study of the nature of the Higgs boson, the investigation of the properties of any newly discovered particles in the upcoming LHC runs, and the extension of the mass reach for further discoveries, an integrated luminosity of 3000 fb-1 will have to be accumulated by the end of the program. In preparation for operation at the HL-LHC , CMS has documented the necessary upgrades and their expected costs in a Technical Proposal submitted to the CERN LHC Committee (LHCC) in mid-2015. The material presented in the current “Scope Document” provides additional information to assist the LHCC and the CERN Resource Review Board (RRB) in their review of the CMS upgrade. The document commences with a summary of the process followed to develop the scope of t...

  12. Silicon drift-chamber prototype for the upgrade of the UA6 experiment at the CERN p /bar char/p collider

    International Nuclear Information System (INIS)

    A large-area (≅ 4 x 4 cm2) silicon drift chamber has been designed and constructed in order to investigate its possible use in the UA6 experiment. The drift chamber will supply unambiguously (x,y) space points on each track; each arm of the UA6 spectrometer will be provided with two layers of drift detectors. 12 refs., 4 figs

  13. CMS geometry through 2020

    International Nuclear Information System (INIS)

    CMS faces real challenges with upgrade of the CMS detector through 2020 and beyond. One of the challenges, from the software point of view, is managing upgrade simulations with the same software release as the 2013 scenario. We present the CMS geometry description software model, its integration with the CMS event setup and core software. The CMS geometry configuration and selection is implemented in Python. The tools collect the Python configuration fragments into a script used in CMS workflow. This flexible and automated geometry configuration allows choosing either transient or persistent version of the same scenario and specific version of the same scenario. We describe how the geometries are integrated and validated, and how we define and handle different geometry scenarios in simulation and reconstruction. We discuss how to transparently manage multiple incompatible geometries in the same software release. Several examples are shown based on current implementation assuring consistent choice of scenario conditions. The consequences and implications for multiple/different code algorithms are discussed.

  14. CMS Geometry Through 2020

    Science.gov (United States)

    Osborne, I.; Brownson, E.; Eulisse, G.; Jones, C. D.; Lange, D. J.; Sexton-Kennedy, E.

    2014-06-01

    CMS faces real challenges with upgrade of the CMS detector through 2020 and beyond. One of the challenges, from the software point of view, is managing upgrade simulations with the same software release as the 2013 scenario. We present the CMS geometry description software model, its integration with the CMS event setup and core software. The CMS geometry configuration and selection is implemented in Python. The tools collect the Python configuration fragments into a script used in CMS workflow. This flexible and automated geometry configuration allows choosing either transient or persistent version of the same scenario and specific version of the same scenario. We describe how the geometries are integrated and validated, and how we define and handle different geometry scenarios in simulation and reconstruction. We discuss how to transparently manage multiple incompatible geometries in the same software release. Several examples are shown based on current implementation assuring consistent choice of scenario conditions. The consequences and implications for multiple/different code algorithms are discussed.

  15. CMS results in the Combined Computing Readiness Challenge CCRC'08

    International Nuclear Information System (INIS)

    During February and May 2008, CMS participated to the Combined Computing Readiness Challenge (CCRC'08) together with all other LHC experiments. The purpose of this worldwide exercise was to check the readiness of the Computing infrastructure for LHC data taking. Another set of major CMS tests called Computing, Software and Analysis challenge (CSA'08) - as well as CMS cosmic runs - were also running at the same time: CCRC augmented the load on computing with additional tests to validate and stress-test all CMS computing workflows at full data taking scale, also extending this to the global WLCG community. CMS exercised most aspects of the CMS computing model, with very comprehensive tests. During May 2008, CMS moved more than 3.6 Petabytes among more than 300 links in the complex Grid topology. CMS demonstrated that is able to safely move data out of CERN to the Tier-1 sites, sustaining more than 600 MB/s as a daily average for more than seven days in a row, with enough headroom and with hourly peaks of up to 1.7 GB/s. CMS ran hundreds of simultaneous jobs at each Tier-1 site, re-reconstructing and skimming hundreds of millions of events. After re-reconstruction the fresh AOD (Analysis Object Data) has to be synchronized between Tier-1 centers: CMS demonstrated that the required inter-Tier-1 transfers are achievable within a few days. CMS also showed that skimmed analysis data sets can be transferred to Tier-2 sites for analysis at sufficient rate, regionally as well as inter-regionally, achieving all goals in about 90% of >200 links. Simultaneously, CMS also ran a large Tier-2 analysis exercise, where realistic analysis jobs were submitted to a large set of Tier-2 sites by a large number of people to produce a chaotic workload across the systems, and with more than 400 analysis users in May. Taken all together, CMS routinely achieved submissions of 100k jobs/day, with peaks up to 200k jobs/day. The achieved results in CCRC'08 - focussing on the distributed

  16. Resistive Plate Chambers for 2013-2014 upgrade of CMS

    CERN Document Server

    Colafranceschi, Stefano

    2014-01-01

    The Compact Muon Solenoid (CMS) detector operates at the Large Hadron Collider (LHC) at CERN. It was proposed to install the fourth endcap (+,- RE4) consisting of Resistive Plate Chambers (RPCs) for the CMS muon Endcap system, in order to improve its Level-1 trigger efficiency and thereby completing the full implementation of the TDR, after which LHC will run with its full designed luminosity. This station is currently being installed in the first Long Shutdown (LS-1) of LHC during 2013-2014. In this presentation, we will discuss about the entire procedure of standardization of leak and spacer tests for the gas-gaps, the new design for the Cu cooling system, assembly, testing and characterization of RPCs which is being executed in a synchronized way at the three assembly sites at CERN, BARC-Mumbai and University of Ghent, Belgium. In this talk the RPC chamber production and commissioning will be described in detail. Few preliminary results will be shown.

  17. CMS Honours Three Russian and Bielorussian companies

    CERN Multimedia

    2003-01-01

    On 7 March, CMS handed out the three latest Gold Awards under its scheme for honouring its best suppliers suppliers (c.f. Bulletin n°10/2003). Three Russian and Bielorussian firms were honoured, on the occasion of a visit by dignitaries from the two countries. CERN played host to Anatoly Sherbak, Head of the Fundamental Research Department of the Russian Federation Ministry of Industry and Science, Ambassador Sergei Aleinik, Permanent Representative of the Republic of Belarus to the Office of the United Nations at Geneva, Andrei Pirogov, Assistant Permanent Representative of the Russian Federation to the Office of the United Nations, and Alexei Sissakian, Vice Director of the JINR (Joint Institute for Nuclear Research) at Dubna in Russia. The directors of the three Russian and Bielorussian firms have received their awards and are seen with the visiting Russian and Bielorussian dignitaries and the CMS leaders in front of the CMS hadron calorimeter, on the spot where the detector is being assembled.These promi...

  18. CMS prepares for new challenges

    CERN Multimedia

    Antonella Del Rosso

    2014-01-01

    One of the world’s largest physics experiments has just had a change in leadership. This is a chance for the collaboration to take stock of the tremendous work done for LS1 and to prepare for the challenges that lie ahead.   From left to right: Kerstin Borras, Tiziano Camporesi and Paris Sphicas. “The keyword is teamwork. That’s the only way you can effectively manage a large number of extremely talented and motivated people,” says Tiziano Camporesi who took the reins of the CMS collaboration at the beginning of the year. The recipe might seem easier on paper than in practice. However, given his 28 years at CERN, two of which he spent as the head of the DELPHI collaboration, Camporesi has extensive experience in managing large scientific collaborations and success in this respect is well within his reach: “I have learned many lessons from the past and I believe that building consensus is instrumental to successful leadership.” The C...

  19. CMS Grid Activities in Europe

    Institute of Scientific and Technical Information of China (English)

    C.Grandi; L.Berti; 等

    2001-01-01

    The CMS experiment at the CERN LHC collider is producing large amounts of simulated data in order to provide an adequate statistic for the Trigger System design.These productions are performed in a distributed environment,prototyping the hierarchical model of LHC computing centers developed by MONARC.A GRID approach is being used for interconnecting the Regional Centers.The main issues which are currently addressed are:automatic submission of data production requests to available productioin sites,data transfer among production sites,“best-replica” location and submission of enduser analysis job to the appropriate Regional Center,In each production site different hardware configurations are being tested and exploited.Furthermore robust job submission systems.which are also able to provide the needed bookkeeping of the produced data are being developed.BOSS(Batch Object Submission System)is an interface to the local computing center scheduling system that has been developed in order to allow recording in a relational database of information produced by the jobe running on the batch facilities A summary of the current activites and a plan for the use of DataGrid PM9 tools are presented.

  20. CERN as seen by its personnel

    CERN Multimedia

    2009-01-01

    How are the various players in research experiencing the run-up to the restart of the LHC? How do they feel their work is perceived outside CERN? After interviewing the inhabitants of Meyrin, Divonne-les-Bains and Geneva on the subject of the LHC and CERN, the Bulletin went to put its questions to the CERN personnel themselves. For some, working at CERN had always been a childhood dream. Today, as we approach the restart of the largest particle accelerator in the world, everybody is very enthusiastic about taking part in this adventure. In the words of a CMS physicist: "This is something that happens once in a scientist’s lifetime!" But what do the researchers consider to be the most important thing we do at CERN? It’s difficult to pin them down to any one specific thing, so this question gets the virtually unanimous general reply: "the advancement of knowledge". Many also mention the concrete spin-offs of technology transfer. However, nobody can anticipate what developments will arise in this field: wh...

  1. CERN completes transition to lead-ion running at the LHC

    CERN Multimedia

    CERN Video Productions

    2010-01-01

    ALICE experiment a. General views ALICE control room b. Interview Paolo Giubellino, ALICE spokesperson elect, INFN Torino c. Interview Juergen Schukraft, ALICE spokesperson, CERN d. Events display: first heavy ion collisions at ALICE 2. CMS experiment a. General views CMS control room b. Interview Bolek Wyslouch, CMS Heavy Ions Run Coordinator, MIT c. Events display: first heavy ion collisions at CMS 3. ATLAS experiment a. General views ATLAS control room b. Interview Peter Steinberg, ATLAS , Brookhaven National Laboratory c. Interview Will Brooks, ATLAS, Univ. Tecnica Federico Santa Maria (UTFSM) d. Events display: first heavy ion collisions at ATLAS

  2. CMS: Simulated Higgs to two jets and two electrons

    CERN Multimedia

    1997-01-01

    This track is an example of simulated data modelled for the CMS detector on the Large Hadron Collider (LHC) at CERN, which will begin taking data in 2008. Here a Higgs boson is produced which decays into two jets of hadrons and two electrons. The lines represent the possible paths of particles produced by the proton-proton collision in the detector while the energy these particles deposit is shown in blue.

  3. Measurement of the wire tension and position of the muon detector in the CMS project

    International Nuclear Information System (INIS)

    The Large Hadron Collider (LHC) is currently being constructed at CERN including the ATLAS (A Toroidal LHC Apparatus) and CMS. It this report, it is have a sample introduction of CMS Muon detector, the drift tube introduction and chamber construction. The scope of this report covers the drift tube design and technical description; measurement of the wire tension of the Muon detector and the quality control; measurement of the wire position of the Muon detector and the quality control and so on. (authors)

  4. 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.

  5. 16th November 2010 - Chinese Vice Minister of Science and Technology J. Cao signing the guest book with CERN Director-General R. Heuer and Head of International Relations F. Pauss.

    CERN Multimedia

    Maximilien Brice

    2010-01-01

    CERN-HI-1011300 19-41: visiting SM18 with F. Bertinelli CERN-HI-1011300 43-66; visiting CMS Control Centre in Meyrin with Collaboration Spokesperson G. Tonelli CERN-HI-1011300 67-85: in the ATLAS Visitor Centre with Former Collaboration Spokesperson P. Jenni CERN-HI-1011300 86-87: meeting young representatives of the CERN Chinese community in the Glassbox, restaurant 1.

  6. New Zealand students on tour at CERN

    CERN Multimedia

    2005-01-01

    The three prize-winners Katrina Hamblin, Jordan Roach and Ellen Clarkson in front of the CMS magnet, with their teacher Noema Watene on the left. The "Journey to the End of Science" makes a stop at CERN. Katrina Hamblin, Jordan Roach and Ellen Clarkson, three high-school students from Fairfield College in Hamilton, New Zealand, won first prize in the New Zealand Royal Society's scientific film competition - the trip of a lifetime to Europe. The reward for their excellent documentary on the nuclear physicist and winner of the Nobel prize for Medicine Maurice Wilkins was a trip to Italy and Switzerland, stopping at CERN on the way. Accompanied by one of their teachers and a science journalist, the students were shown around the antiproton decelerator and the CMS experiment by Alick Macpherson, a Kiwi physicist at CERN. Their faithful camera always at the ready, the students filmed every minute of their visits to the various sites - perhaps they were hatching plans for next year's competition...

  7. CMS Thesis Award

    CERN Multimedia

    2004-01-01

    The 2003 CMS thesis award was presented to Riccardo Ranieri on 15 March for his Ph.D. thesis "Trigger Selection of WH → μ ν b bbar with CMS" where 'WH → μ ν b bbar' represents the associated production of the W boson and the Higgs boson and their subsequent decays. Riccardo received his Ph.D. from the University of Florence and was supervised by Carlo Civinini. In total nine thesis were nominated for the award, which was judged on originality, impact within the field of high energy physics, impact within CMS and clarity of writing. Gregory Snow, secretary of the awarding committee, explains why Riccardo's thesis was chosen, ‘‘The search for the Higgs boson is one of the main physics goals of CMS. Riccardo's thesis helps the experiment to formulate the strategy which will be used in that search.'' Lorenzo Foà, Chairperson of the CMS Collaboration Board, presented Riccardo with an commemorative engraved plaque. He will also receive the opportunity to...

  8. Operation and performance of the CMS tracker

    CERN Document Server

    Malberti, Martina

    2014-01-01

    The CMS silicon tracker is the largest silicon detector ever built. It consists of an inner pixel detector, with 66 million readout channels, and an outer 200 m$^{2}$ silicon strip detector with 10 million channels. The successful operation of this detector during the first three years of LHC running with proton-proton and heavy ion collisions is discussed. Results include operational challenges encountered during data taking that influenced the active fraction and readout efficiency of the detectors. Details are given on the performance at high occupancy with respect to local observables, such as signal-to-noise ratio and hit reconstruction efficiency, and on radiation effects with respect to the evolution of power consumption, sensor bias, readout thresholds and leakage current.

  9. First two barrel ECAL supermodules inserted in CMS HCAL

    CERN Multimedia

    K.Bell

    2006-01-01

    The first two barrel "supermodules" for the CMS Electromagnetic Calorimeter (ECAL) have been inserted into the barrel hadron calorimeter (HCAL) in the experimental hall (called SX5) in Cessy in preparation for the forthcoming magnet test and cosmic challenge (MTCC). Each of the two supermodules contains 1700 lead tungstate crystals in glass-fibre alveolar support structures, with associated avalanche photodiodes (APDs, for scintillation light detection), electronics and cooling system. The barrel ECAL will consist of 36 supermodules, many of which have already been produced (see CERN Bulletin 17-18, 2006). Team from CMS ECAL, CMS Integration and CEA-DAPNIA were involved in the insertion, with the production/integration of the supermodules themselves involving many technicians, engineers and physicists from many institutes. From left to right: Olivier Teller, Maf Alidra and Lucien Veillet.

  10. Particles Hunters: the CMS Quest

    CERN Multimedia

    CERN MultiMedia Productions

    2004-01-01

    Words from physicists Anne-Sylvie Giolo ETH Zürich, Joao Varela Lisbon Inst. of Physics, Paul Lecoq CERN, Duccio Abbaneo CERN, Apollo Go CERN, Jan Troska CERN, Walter Van Doninck VUB Brussel, Jim Rohlf Boston University, Randy Ruchti Univ. of Notre Dame USA.

  11. Hangout with CERN: Welcome to CERN (S01E01)

    CERN Multimedia

    Kahle, Kate

    2012-01-01

    In this first Hangout with CERN "Welcome to CERN" ATLAS physicist Steven Goldfarb, CERN theorist Alvaro De Rujula and Mick Storr from the CERN education group introduce CERN and answer some of the questions received via #askCERN on Twitter and Google+. Recorded live on 1st November 2012.

  12. The Latest from CMS

    CERN Multimedia

    2009-01-01

    CMS is on track to be ready for physics one month in advance of the LHC restart. The final installations are being completed and tests are being run to ensure that the experiment is as well prepared as possible to exploit sustained LHC operation throughout 2010. Physics week in Bologna, Italy, was a valuable time for CMS collaborators to discuss preparations for numerous physics analyses, as well as the performance of the detector during the recent data-taking period with cosmics (CRAFT 09). During this five-week exercise, more than 300 million cosmic events were recorded with the magnetic field on. This large data-set is being used to further improve the sub-detector alignment, calibration and performance whilst awaiting p-p collisions. Meanwhile, in the experimental cavern, Wolfram Zeuner, Deputy Technical Coordinator of CMS, reports "We are now very nearly closed up again. We are just doing the final clean-up work and are ready t...

  13. Virgin Galactic explores CERN

    CERN Multimedia

    2016-01-01

    Virgin Galactic visited CERN with a group of future astronauts and Sir Richard Branson. During their visit the group was shown around various experiments, including the Globe, SM18, AMS and the CERN Control Centre.

  14. Doing business with CERN

    CERN Multimedia

    2015-01-01

    The Procurement Service, in collaboration with the Communications group’s Design team, has recently launched a new information campaign targeted at companies wishing to supply their products and services to CERN. This campaign comprises:   A brochure, available in hard and soft copy:  http://procurement.web.cern.ch/brochures/doing-business-with-cern.   A 6-minute video overview: https://procurement-dev.web.cern.ch/doing-business-with-cern. This campaign is intended for Member State firms with whom CERN is yet to do business. The key objectives are: To emphasise that CERN can be considered a major customer across a wide range of activities;   To present CERN’s procurement procedures in a dynamic and digestible way;   To highlight the information available on CERN’s procurement website: http://procurement.web.cern.ch. Furthermore, a new section called “Having a contract with CERN” is also now ava...

  15. CERN Shop Christmas Sale

    CERN Multimedia

    Visits & Exhibition Service/ETT-VE

    2001-01-01

    11-13.12.2001 Looking for Christmas present ideas? Come to the Reception Shop Special Stand in Meyrin, Main Building, ground floor, from Tuesday 11 to Thursday 13 December from 10.30 to 16.00. CERN Calendar 10.- CERN Sweat-shirts(M, L, XL) 30.- CERN T-shirt (M, L, XL) 20.- New CERN silk tie (2 colours) 35.- Fancy silk tie (blue, bordeau) 25.- Silk scarf (light blue, red, yellow) 35.- Swiss army knife with CERN logo 25.- CERN watch 25.- CERN baseball cap 15.- CERN briefcase 15.- Book 'Antimatter' (English) 35.- Book 'How the web was born' (English) 25.- The Search for Infinity (French, Italian, English, German) 40.-   If you miss this special occasion, the articles are also available at the Reception Shop in Building 33 from Monday to Saturday between 08.30 and 17.30 hrs.

  16. CMS analysis operations

    International Nuclear Information System (INIS)

    During normal data taking CMS expects to support potentially as many as 2000 analysis users. Since the beginning of 2008 there have been more than 800 individuals who submitted a remote analysis job to the CMS computing infrastructure. The bulk of these users will be supported at the over 40 CMS Tier-2 centres. Supporting a globally distributed community of users on a globally distributed set of computing clusters is a task that requires reconsidering the normal methods of user support for Analysis Operations. In 2008 CMS formed an Analysis Support Task Force in preparation for large-scale physics analysis activities. The charge of the task force was to evaluate the available support tools, the user support techniques, and the direct feedback of users with the goal of improving the success rate and user experience when utilizing the distributed computing environment. The task force determined the tools needed to assess and reduce the number of non-zero exit code applications submitted through the grid interfaces and worked with the CMS experiment dashboard developers to obtain the necessary information to quickly and proactively identify issues with user jobs and data sets hosted at various sites. Results of the analysis group surveys were compiled. Reference platforms for testing and debugging problems were established in various geographic regions. The task force also assessed the resources needed to make the transition to a permanent Analysis Operations task. In this presentation the results of the task force will be discussed as well as the CMS Analysis Operations plans for the start of data taking.

  17. The CERN Library

    CERN Multimedia

    Hester, Alec G

    1968-01-01

    Any advanced research centre needs a good Library. It can be regarded as a piece of equipment as vital as any machine. At the present time, the CERN Library is undergoing a number of modifications to adjust it to the changing scale of CERN's activities and to the ever increasing flood of information. This article, by A.G. Hester, former Editor of CERN COURIER who now works in the Scientific Information Service, describes the purposes, methods and future of the CERN Library.

  18. Greece at CERN

    CERN Multimedia

    CERN Press Office. Geneva

    1997-01-01

    Greece, one of CERN*'s founding Member States, inaugurated its first Industrial Exhibition at the Meyrin site on Tuesday, 14 October. After a meeting with CERN's Director General, Professor Christopher Llewellyn Smith, Professor Emmanuel Frangoulis, the General Secretary of the Greek Ministry of Industry, accompanied by Prof Emmanuel Floratos, Greek delegate to CERN council visited the DELPHI experiment on the LEP collider, guided by Andromachi Tsirou, a Greek physicist.

  19. France at CERN

    CERN Multimedia

    CERN Bulletin

    2010-01-01

    Rolf Heuer, CERN Director General, visits the exhibition "La France au CERN". The exhibition France at CERN, organized by UBIFRANCE in collaboration with CERN's GS/SEM (Site Engineering and Management) service, took place from Monday 7 to Wednesday 9 June in the Main Building. The 36 French firms taking part came to present their products and technologies related to the Organization's activities. The next exhibition will be "Netherlands at CERN" in November.

  20. CMS Software Distribution and Installation Systems:Concepts,Practical Solutions and Experience at Fermilab as a CMS Tier 1 Center

    Institute of Scientific and Technical Information of China (English)

    NataliaM.Ratnikova; GregoryE.Graham

    2001-01-01

    The CMS Collaboration of 2000 scientists involves 150 institutions from 31 nations spread all over the world.CMS software system integration and release management is performed at CERN.Code management is based on CVS,with read or write access to the repository via a CVS server,Software configuration,release management tools(SCRAM) are being developed at CERN.Software releases are then distributed to regional centers,where the software is used by a local community for a wide variety of tasks,such as software development detector simulation and reconstruction and physics analysis.Depending on specific application,the system environment and local hardware requirements,different approaches and tools are used for the CMS software installation at different places.This presentation describes concepts and reactial solutions for a variety of ways of software distribution,with an emphasis on the CMS experience at Fermilab,Installation and usage of different models used for the production farm,for code development and for physics analysis are described.

  1. ATLAS/CMS Upgrades

    CERN Document Server

    Horii, Yasuyuki; The ATLAS collaboration

    2016-01-01

    Precision studies of the Standard Model (SM) and the searches of the physics beyond the SM are ongoing at the ATLAS and CMS experiments at the Large Hadron Collider (LHC). A luminosity upgrade of LHC is planned, which provides a significant challenge for the experiments. In this report, the plans of the ATLAS and CMS upgrades are introduced. Physics prospects for selected topics, including Higgs coupling measurements, Bs,d -> mumu decays, and top quark decays through flavor changing neutral current, are also shown.

  2. CMS Comic Book

    CERN Multimedia

    Gill, Karl Aaron

    2006-01-01

    Titled "CMS Particle Hunter," this colorful comic book style brochure explains to young budding scientists and science enthusiasts in colorful animation how the CMS detector was made, its main parts, and what scientists hope to find using this complex tool. Book invites young students to get involved in particle physics themselves to join the adventure. Written by Dave Barney and Aline Guevera. Layout and drawings by Eric Paiharey and Frederic Vignaux. Available in English, French, German, Italian, Spanish and Portuguese. Year Produced: 2006. Update: September 2013.

  3. CERN Photowalk 2015

    CERN Multimedia

    2015-01-01

    CERN is organising a Photowalk on Friday 25 September 2015. At this event a few selected photographers will get the chance to come to CERN, the European Organization for Nuclear Research, for an exclusive behind-the-scenes tour of the laboratory. For more information: http://photowalk2015.web.cern.ch/

  4. In the CERN Library

    CERN Multimedia

    1963-01-01

    Seen in this picture is Noria Christophoridou, librarian of the Greek Atomic Energy Commission, who has been sent by her government to CERN for a year to widen her experience of library and documentation services. In the photograph she is providing information to Kurt Gottfried, a CERN visiting scientist from Harvard University, who is spending a year with CERN's Theory Division

  5. Members of the Forum Engelberg visit CERN

    CERN Multimedia

    Patrice Loïez

    2002-01-01

    The Forum Engelberg is an annual interdisciplinary conference held in Engelberg, Switzerland intended to act as an international platform for debate and exchange of views on key issues affecting scientific research, technology, economics and philosophy. Its President, Hubert Curien - former French Minister of Research and Space Research, and President of the CERN Council from 1994 to 1996 - is pictured here. Photo 01: Hubert Curien in front of the first half of the CMS detector's barrel hadronic calorimeter (HCAL). The barrel HCAL is a cylindrical structure which will surround the collision region and measure the energy of quarks and jets emerging at large angles relative to the beam direction. Photo 02: Hubert Curien (left) with Bernard Ecoffey, Founder of the Forum Engelberg, in front of the first half of the CMS detector's barrel hadronic calorimeter.

  6. A banner bearing the fiftieth anniversary logo is raised in the CMS hall, symbolically marking the start of the festivities in France. Robert Aymar, Director-General of CERN, can be seen at the commands of the overhead crane, while Gilles Giuliani, Sub-Prefect of Gex, applauds warmly.

    CERN Multimedia

    Maximilien Brice

    2004-01-01

    CERN's Director-General thanked the mayors of the local communes for their support, as well as the representatives of the Communauté de Communes of the Pays de Gex and the Conseil général of the Ain. He also mentioned the social role of a research body like CERN.

  7. A Method to Simulate the Observed Surface Properties of Proton Irradiated Silicon Strip Sensors

    CERN Document Server

    Peltola, Timo; Dalal, Ranjeet; Eber, Robert; Eichhorn, Thomas; Lalwani, Kavita; Messineo, Alberto; Printz, Martin; Ranjan, Kirti

    2015-01-01

    During the scheduled high luminosity upgrade of LHC, the world's largest particle physics accelerator at CERN, the position sensitive silicon detectors installed in the vertex and tracking part of the CMS experiment will face more intense radiation environment than the present system was designed for. To upgrade the tracker to required performance level, extensive measurements and simulations studies have already been carried out. A defect model of Synopsys Sentaurus TCAD simulation package for the bulk properties of proton irradiated devices has been producing simulations closely matching with measurements of silicon strip detectors. However, the model does not provide expected behavior due to the fluence increased surface damage. The solution requires an approach that does not affect the accurate bulk properties produced by the proton model, but only adds to it the required radiation induced properties close to the surface. These include the observed position dependency of the strip detector's charge collec...

  8. 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.

  9. An outlook of the user support model to educate the users community at the CMS Experiment

    CERN Document Server

    Malik, Sudhir

    2011-01-01

    The CMS (Compact Muon Solenoid) experiment is one of the two large general-purpose particle physics detectors built at the LHC (Large Hadron Collider) at CERN in Geneva, Switzerland. The diverse collaboration combined with a highly distributed computing environment and Petabytes/year of data being collected makes CMS unlike any other High Energy Physics collaborations before. This presents new challenges to educate and bring users, coming from different cultural, linguistics and social backgrounds, up to speed to contribute to the physics analysis. CMS has been able to deal with this new paradigm by deploying a user support structure model that uses collaborative tools to educate about software, computing an physics tools specific to CMS. To carry out the user support mission worldwide, an LHC Physics Centre (LPC) was created few years back at Fermilab as a hub for US physicists. The LPC serves as a "brick and mortar" location for physics excellence for the CMS physicists where graduate and postgraduate scien...

  10. Ministers from Belgium and the Netherlands visit CERN

    CERN Multimedia

    2005-01-01

    The Belgian Minister of Economy, Energy, Foreign Trade and Science Policy, Marc Verwilghen, with CERN's Director-General, Robert Aymar.From left to right, Frank Linde, Director of the Netherlands National Institute for Nuclear Physics and High Energy Physics (NIKHEF), Jos Engelen, CERN's Chief Scientific Officer, Maria van der Hoeven, Netherlands Minister for Education, Culture and Science, and Herman Ten Kate, Head of the ATLAS magnet project, visiting the ATLAS assembly hall. Marc Verwilghen, Belgian Minister of Economy, Energy, Foreign Trade and Science Policy, came to CERN on 8 April 2005, where he visited the CMS assembly hall and underground cavern, as well as the hall where the LHC superconducting magnets are being tested. A few days later, on 21 April, the Netherlands Minister for Education, Culture and Science, Mrs Maria van der Hoeven, was welcomed to CERN by the Director-General, Robert Aymar, and the Chief Scientific Officer, Jos Engelen. Minister van der Hoeven visited the ATLAS installations, t...

  11. Members of the Forum Engelberg visit CERN

    CERN Multimedia

    Patrice Loïez

    2002-01-01

    The Forum Engelberg is an annual interdisciplinary conference held in Engelberg, Switzerland intended to act as an international platform for debate and exchange of views on key issues affecting scientific research, technology, economics and philosophy. Its President is Hubert Curien - former French Minister of Research and Space Research, and President of the CERN Council from 1994 to 1996. Photo 01: Thérèse Wolf, Secretary of Forum Engelberg; Alain Hervé; Horst Wenninger; and Alexander Höchli, Forum member and former Landammann of the canton of Obwalden, at the CMS detector's assembly site.

  12. A Nobel Prize winner visits CERN

    CERN Multimedia

    2007-01-01

    Nobel Prize-winning astrophysicist George Smoot visited CERN on 2 February with a message for particle physicists and cosmologists alike. After a tour of ATLAS and CMS, Smoot gave a talk to a packed Council Chamber about the connections between particle physics and cosmology, and how the two disciplines can help each other to find answers to their cosmic questions. Smoot's group at Lawrence Berkeley National Laboratory is currently working on the development of the Max Planck Surveyor, the next generation of satellite to study cosmic microwave background anisotropy, which will teach us about how our universe was formed.

  13. CERN encourages girls to "expand their horizons"

    CERN Multimedia

    François Briard

    2015-01-01

    On 14 November, CERN took part for the fourth time in "Élargis tes horizons" (see here), a conference organised every two years at Geneva University for girls from the local region aged 11 to 14 aiming to encourage them to take up studies and careers in the scientific and technical domains.   Claude Sanz (left), a fellow in the EN Department, explaining to three girls how to build a particle accelerator in a salad bowl. This year, young physicists and engineers from ATLAS and CMS ran three workshops: "Seeing the invisible using a cloud chamber", "Great cold fun and treats with liquid nitrogen" and "Build your own accelerator in a salad bowl!" CERN was also represented at the Forum de Découverte, represented by the Diversity Office and the Medialab team, presenting the "Higgnite" interactive experiment, which illustrates the principle of the Higgs field. More...

  14. CMS SEES FIRST COLLISIONS

    CERN Multimedia

      A very special moment.  On 23rd November, 19:40 we recorded our first collisions with 450GeV beams well centred in CMS.   If you have any comments / suggestions please contact Karl Aaron GILL (Editor)

  15. CMS soft QCD

    CERN Document Server

    Kuznetsova, Ekaterina

    2016-01-01

    Soft QCD measurements play am important role in fundamental QCD studies as well as in tuning of corresponding Monte Carlo generator models for a good description of experimental data. The presented overview covers CMS studies on Underlying Event activity, transitions between perturbative and non-perturbative QCD regions, inclusive studies of diffractive production and recent measurements of the charged hadron multiplicity in inelastic production.

  16. Collide@CERN Geneva

    CERN Document Server

    CERN. Geneva; Kieffer, Robert; Blas Temino, Diego; Bertolucci, Sergio; Mr. Decelière, Rudy; Mr. Hänni, Vincent

    2014-01-01

    CERN, the Republic and Canton of Geneva, and the City of Geneva are delighted to invite you to “Collide@CERN Geneva Music”. Come to the public lecture about collisions between music and particle physics by the third winners of Collide@CERN Geneva, Vincent Hänni & Rudy Decelière, and their scientific inspiration partners, Diego Blas and Robert Kieffer. The event marks the beginning of their residency at CERN, and will be held at the CERN Globe of Science and Innovation on 16 October 2014 at 19.00. Doors will open at 18.30.

  17. CERN Cricket Club

    CERN Multimedia

    CERN Cricket Club

    2010-01-01

    CERN Cricket Club Match Reports The cricket season is well under way, despite the weather, and several matches have been played. The match reporters have, however, found it too difficult to limit their reports to ¼ of a page, hence the reports have not appeared in the bulletin. All reports can be found at http://cern.ch/Club-Cricket/reports/reports.html The list of forthcoming matches can be consulted at http://cern.ch/Club-Cricket/fixtures.html Further information about the CERN Cricket Club can be found at http://cern.ch/Club-Cricket/

  18. Britain at CERN

    CERN Multimedia

    CERN Press Office. Geneva

    1996-01-01

    On 8 October, H.E. Mr David Beattie, British Ambassador to Switzerland, Mr John R. Nichols, H.M. Consul-General in Geneva and, Prof. Christopher Llewellyn Smith, CERN*'s Director General, formally opened the industrial exhibition of thirty-three British hi-tech companies at CERN, which takes place from 8 to 11 October, 1996. The exhibition offers British companies the opportunity to display their products in fields that are of immediate importance to the scientists, engineers and technicians working at CERN, and also to scientists from non-Member States who take part in research projects at CERN.

  19. Signature d'un projet de protocole d'accord entre le CERN et l'Iran

    CERN Multimedia

    CERN Press Office. Geneva

    2001-01-01

    Iranian Minister for Science, Research and Technology, Dr Mostafa Moin, and CERN Director-General, Professor Luciano Maiani, today signed a draft Memorandum of Understanding concerning the participation of Iranian universities in the Laboratory's scientific programme. Under this agreement, one Iranian researcher and three students will come to CERN to participate in the CMS experiment, with Iranian industry contributing to the experiment's construction. The Memorandum also paves the way for possible further Iranian involvement with experiments at CERN.

  20. CERN honours Georges Charpak

    CERN Multimedia

    2009-01-01

    CERN pays tribute to the work of Georges Charpak at a colloquium in honour of his 85th birthday. var flash_video_player=get_video_player_path(); insert_player_for_external('Video/Public/Movies/2009/CERN-MOVIE-2009-008/CERN-MOVIE-2009-008-0753-kbps-480x360-25-fps-audio-64-kbps-44-kHz-stereo', 'mms://mediastream.cern.ch/MediaArchive/Video/Public/Movies/2009/CERN-MOVIE-2009-008/CERN-MOVIE-2009-008-Multirate-200-to-753-kbps-480x360.wmv', 'false', 480, 360, 'https://mediastream.cern.ch/MediaArchive/Video/Public/Movies/2009/CERN-MOVIE-2009-008/CERN-MOVIE-2009-008-posterframe-480x360-at-10-percent.jpg', '1167500', true, 'Video/Public/Movies/2009/CERN-MOVIE-2009-008/CERN-MOVIE-2009-008-0600-kbps-maxH-360-25-fps-audio-128-kbps-48-kHz-stereo.mp4'); Watch the video conference of Georges Charpak.   On 9 March CERN’s Main Auditorium was the venue for a fascinating and moving celebration marking the 85th birthday of Georges Charpak, who was awarded the Nobel Prize for Physics in 1992 for his inven...