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Sample records for cms rpc muon

  1. Installation of last DT+RPC packages for the muon barrel detector of CMS

    CERN Multimedia

    Jesus Puerta-Pelayo

    2007-01-01

    On friday 26 October 2007 the last BMu package (DT+RPC chambers) was installed in the cavern into the iron yoke of CMS. This operation marked the completion of the central muon detector of CMS. Some pictures of this last installation round (8 chambers in total in YB-2 and YB-1) are shown here.

  2. First Results on RB2 Muon Barrel RPC Detector for CMS

    CERN Document Server

    Colaleo, A

    2002-01-01

    The first CMS MB2 station, with one RPC and one DT module, has been tested with a muon beam under a high intensity photon flux at the CERN Gamma Irradiation Facility (GIF) during the Autumn 2001 test. Results on efficiency, rate capability, cluster size and spatial resolution, for the RPC detector, are reported here. Studies with a small percentage of SF6 in the gas mixture, in order to decrease the noise rate, have also been carried out.

  3. Performance of the gas gain monitoring system of the CMS RPC muon detector

    CERN Document Server

    Benussi, L; Passamonti, L; Piccolo, D; Pierluigi, D; Raffone, G; Russo, A; Saviano, G; Ban, Y; Cai, J; Li, Q; Qian, S; Wang, D; Xu, Z; Zhang, F; Choi, Y; Kim, D; Choi, S; Hong, B; Kang, J W; Kang, M; Kwon, J H; Lee, K S; Park, S K; Pant, L; Singh, V B J; Kumar, A M R; Kumar, S; Chand, S; Singh, A; Bhandari, V K; Cimmino, A; Ocampo, A; Thyssen, F; Tytgat, M; Van Doninck, W; Ahmad, A; Muhamma, S; Shoaib, M; Hoorani, H; Awan, I; Ali, I; Ahmed, W; Asqhar, M I; Shahzad, H; Sayed, A; Ibrahim, A; Ali, S; Ali, R; Radi, A; Elkafrawi, T; Sharma, A; Colafranceschi, S; Abbrescia, M; Verwilligen, P; Meola, S; Cavallo, N; Braghieri, A; Montagna, P; Riccardi, C; Salvini, P; Vitulo, P; Dimitrov, A; Hadjiiska, R; Litov, L; Pavlov, B; Petkov, P; Aleksandrov, A; Genchev, V; Iaydjiev, P; Rodozov, M; Sultanov, G; Vutova, M; Stoykova, S; Ibarguen, H S; Pedraza Morales, M I; Bernardino, S Carpinteyro; Bagaturia, I

    2015-01-01

    The RPC muon detector of the CMS experiment at the LHC (CERN, Geneva, Switzerland) is equipped with a Gas Gain Monitoring (GGM) system. A report on the stability of the system during the 2011-2012 data taking run is given, as well as the observation of an effect which suggests a novel method for the monitoring of gas mixture composition.

  4. CMS RPC muon detector performance with 2010-2012 LHC data

    CERN Document Server

    INSPIRE-00316302; Ban, Y.; Cai, J.; Li, Q.; Liu, S.; Qian, S.; Wang, D.; Xu, Z.; Zhang, F.; Choi, Y.; Kim, D.; Goh, J.; Choi, S.; Hong, B.; Kang, J.W.; Kang, M.; Kwon, J.H.; Lee, K.S.; Lee, S.K.; Park, S.K.; Pant, L.M.; Mohanty, A.K.; Chudasama, R.; Singh, J.B.; Bhatnagar, V.; Mehta, A.; Kumar, R.; Cauwenbergh, S.; Costantini, S.; Cimmino, A.; Crucy, S.; Fagot, A.; Garcia, G.; Ocampo, A.; Poyraz, D.; Salva, S.; Thyssen, F.; Tytgat, M.; Zaganidis, N.; Doninck, W.V.; Cabrera, A.; Chaparro, L.; Gomez, J.P.; Gomez, B.; Sanabria, J.C.; Avila, C.; Ahmad, A.; Muhammad, S.; Shoaib, M.; Hoorani, H.; Awan, I.; Ali, I.; Ahmed, W.; Asghar, M.I.; Shahzad, H.; Sayed, A.; Ibrahim, A.; Aly, S.; Assran, Y.; Radi, A.; Elkafrawy, T.; Sharma, A.; Colafranceschi, S.; Abbrescia, M.; Calabria, C.; Colaleo, A.; Iaselli, G.; Loddo, F.; Maggi, M.; Nuzzo, S.; Radogna, R.; Venditti, R.; Verwilligen, P.; Benussi, L.; Bianco, S.; Piccolo, D.; Paolucci, P.; Buontempo, S.; Cavallo, N.; Merola, M.; Fabozzi, F.; Iorio, O.M.; Braghieri, A.; Montagna, P.; Riccardi, C.; Salvini, P.; Vitulo, P.; Vai, I.; Magnani, A.; Dimitrov, A.; Litov, L.; Pavlov, B.; Petkov, P.; Aleksandrov, A.; Genchev, V.; Iaydjiev, P.; Rodozov, M.; Sultanov, G.; Vutova, M.; Stoykova, S.; Hadjiiska, R.; Ibargüen, H.S.; Morales, M.I.P.; Bernardino, S.C.; Bagaturia, I.; Tsamalaidze, Z.; Crotty, I.; Kim, M.S.

    2014-12-05

    The muon spectrometer of the CMS (Compact Muon Solenoid) experiment at the Large Hadron Collider (LHC) is equipped with a redundant system made of Resistive Plate Chambers and Drift Tube in barrel and RPC and Cathode Strip Chamber in endcap region. In this paper, the operations and performance of the RPC system during the first three years of LHC activity will be reported. The integrated charge was about 2 mC/cm$^{2}$, for the most exposed detectors. The stability of RPC performance, with particular attention on the stability of detector performance such as efficiency, cluster size and noise, will be reported. Finally, the radiation background levels on the RPC system have been measured as a function of the LHC luminosity. Extrapolations to the LHC design conditions and HL-LHC are also discussed.

  5. JTAG test system for RPC muon trigger in the CMS experiment

    CERN Document Server

    Pozniak, Krzysztof T; Pietrusinski, M; Romaniuk, Ryszard; Rutkowski, P Z

    2002-01-01

    Theoretical and practical realisation of the JTAG testing system for the RPC Muon trigger of the CMS experiment at the LHC accelerator at CERN laboratory (Geneva) is presented. The paper covers issues related to tests of connections of the printed circuit boards (PCB) of the RPC trigger. Functionality tests of devices and modules were performed. Special tests were designed for large PLD FPGA. Testing environment for the JTAG model is discussed. The model is based on some existing and some newly developed testing algorithms. Practical system realisation is presented. The system consists of the hardware interface and the software layer. Software was built using C++ object oriented language and databases. Exemplary tests of the RPC Muon trigger electronics was performed and the results were given.

  6. Muon beam trigger and CMS RPC detectors studies in GIF++

    CERN Document Server

    Lomidze, Irakli

    2015-01-01

    During my stay at CERN I took part in the following projects: 1. Installing and testing of the air conditioning system in GIF++ irradiation facility 2. Reconstruction and testing of stand for the RPC chambers hermetic testing 3. Work concerning the Near trigger 4. Modification of the RPC trolley 3

  7. High rate, fast timing Glass RPC for the high ${\\eta}$ CMS muon detectors

    CERN Document Server

    Lagarde, F; Laktineh, I.; Buridon, V.; Chen, X.; Combaret, C.; Eynard, A.; Germani, L.; Grenier, G.; Mathez, H.; Mirabito, L.; Petrukhin, A.; Steen, A.; Tromeur, W.; Wang, Y.; Gong, A.; Moreau, N.; de la Taille, C.; Dulucq, F.; Cimmino, A.; Crucy, S.; Fagot, A.; Gul, M.; Rios, A.A.O.; Tytgat, M.; Zaganidis, N.; Aly, S.; Assran, Y.; Radi, A.; Sayed, A.; Singh, G.; Abbrescia, M.; Iaselli, G.; Maggi, M.; Pugliese, G.; Verwilligen, P.; Van Doninck, W.F.; Colafranceschi, S.; Sharmag, A.; Benussi, L.; Bianco, S.; Piccolo, D.; Primavera, F.; Bhatnagar, V.; Kumari, R.; Mehta, A.; Singh, J.; Ahmad, A.; Ahmed, W.; Asghar, M.I.; Awan, I.M.; Hoorani, R.; Muhammad, S.; Shahzad, H.; Shah, M.A.; Cho, S.W.; Choi, S.Y.; Hong, B.; Kang, M.H.; Lee, K.S.; Lim, J.H.; Park, S.K.; Kim, M.S.; Carpinteyro Bernardino, S.; Pedraza, I.; Uribe Estradam, C.; Carrillo Moreno, S.; Vazquez Valencia, F.; Pant, L.M.; Buontempo, S.; Cavallo, N.; Esposito, M.; Fabozzi, F.; Lanza, G.; Orso, I.; Lista, L.; Meola, S.; Merola, M.; Paolucci, P.; Thyssen, F.; Braghieri, A.; Magnani, A.; Montagna, P.; Riccardi, C.; Salvini, P.; Vai, I.; Vitulo, P.; Ban, Y.; Qian, S.J.; Choi, M.; Choi, Y.; Goh, J.; Kim, D.; Aleksandrov, A.; Hadjiiska, R.; Iaydjiev, P.; Rodozov, M.; Stoykova, S.; Sultanov, G.; Vutova, M.; Dimitrov, A.; Litov, L.; Pavlov, B.; Petkov, P.; Bagaturia, I.; Lomidze, D.; Avila, C.; Cabrera, A.; Sanabria, J.C.; Crotty, I.; Vaitkus, J.

    2016-01-01

    The HL-LHC phase is designed to increase by an order of magnitude the amount of data to be collected by the LHC experiments. To achieve this goal in a reasonable time scale the instantaneous luminosity would also increase by an order of magnitude up to $6.10^{34} cm^{-2} s^{-1}$ . The region of the forward muon spectrometer ($|{\\eta}| > 1.6$) is not equipped with RPC stations. The increase of the expected particles rate up to $2 kHz/cm^{2}$ (including a safety factor 3) motivates the installation of RPC chambers to guarantee redundancy with the CSC chambers already present. The actual RPC technology of CMS cannot sustain the expected background level. The new technology that will be chosen should have a high rate capability and provides a good spatial and timing resolution. A new generation of Glass-RPC (GRPC) using low-resistivity (LR) glass is proposed to equip at least the two most far away of the four high ${\\eta}$ muon stations of CMS. First the design of small size prototypes and studies of their perfor...

  8. High rate, fast timing Glass RPC for the high $\\eta$ CMS muon detectors

    CERN Document Server

    Gouzevitch, Maxime; Laktineh, Imad; Buridon, Victor; Chen, Xiushan; Combaret, Christophe; Eynard, Alexis; Germani, Lionel; Grenier, Gerald; Mathez, Hervé; Mirabito, Laurent; Petrukhin, Alexei; Steen, Arnaud; Tromeur, William; Wang, Yi; Gong, A.; Moreau, Nathalie; de la Taille, Christophe; Dulucq, Fréderic

    2017-01-01

    The HL-LHC phase is designed to increase by an order of magnitude the amount of data to be collected by the LHC experiments. To achieve this goal in a reasonable time scale the instantaneous luminosity would also increase by an order of magnitude up to $6 \\cdot 10^{34}$ cm$^{-2}$s$^{-1}$. The region of the forward muon spectrometer ($|\\eta| > 1.6$) is not equipped with RPC stations. The increase of the expected particles rate up to 2 kHz/cm$^2$ ( including a safety factor 3 ) motivates the installation of RPC chambers to guarantee redundancy with the CSC chambers already present. The actual RPC technology of CMS cannot sustain the expected background level. A new generation Glass-RPC (GRPC) using low resistivity glass (LR) is proposed to equip at least the two most far away of the four high eta muon stations of CMS. The design of small size prototypes and the studies of their performances under high rate particles flux is presented.

  9. High rate, fast timing Glass RPC for the high η CMS muon detectors

    Science.gov (United States)

    Lagarde, F.; Gouzevitch, M.; Laktineh, I.; Buridon, V.; Chen, X.; Combaret, C.; Eynard, A.; Germani, L.; Grenier, G.; Mathez, H.; Mirabito, L.; Petrukhin, A.; Steen, A.; Tromeur, W.; Wang, Y.; Gong, A.; Moreau, N.; de la Taille, C.; Dulucq, F.; Cimmino, A.; Crucy, S.; Fagot, A.; Gul, M.; Rios, A. A. O.; Tytgat, M.; Zaganidis, N.; Aly, S.; Assran, Y.; Radi, A.; Sayed, A.; Singh, G.; Abbrescia, M.; Iaselli, G.; Maggi, M.; Pugliese, G.; Verwilligen, P.; Van Doninck, W.; Colafranceschi, S.; Sharma, A.; Benussi, L.; Bianco, S.; Piccolo, D.; Primavera, F.; Bhatnagar, V.; Kumari, R.; Mehta, A.; Singh, J.; Ahmad, A.; Ahmed, W.; Asghar, H. M. I.; Awan, I. M.; Hoorani, R.; Muhammad, S.; Shahzad, H.; Shah, M. A.; Cho, S. W.; Choi, S. Y.; Hong, B.; Kang, M. H.; Lee, K. S.; Lim, J. H.; Park, S. K.; Kim, M. S.; Carpinteyro Bernardino, S.; Pedraza, I.; Uribe Estrada, C.; Carrillo Moreno, S.; Vazquez Valencia, F.; Pant, L. M.; Buontempo, S.; Cavallo, N.; Esposito, M.; Fabozzi, F.; Lanza, G.; Orso, I.; Lista, L.; Meola, S.; Merola, M.; Paolucci, P.; Thyssen, F.; Braghieri, A.; Magnani, A.; Montagna, P.; Riccardi, C.; Salvini, P.; Vai, I.; Vitulo, P.; Ban, Y.; Qian, S. J.; Choi, M.; Choi, Y.; Goh, J.; Kim, D.; Aleksandrov, A.; Hadjiiska, R.; Iaydjiev, P.; Rodozov, M.; Stoykova, S.; Sultanov, G.; Vutova, M.; Dimitrov, A.; Litov, L.; Pavlov, B.; Petkov, P.; Bagaturia, I.; Lomidze, D.; Avila, C.; Cabrera, A.; Sanabria, J. C.; Crotty, I.; Vaitkus, J.

    2016-09-01

    The HL-LHC phase is designed to increase by an order of magnitude the amount of data to be collected by the LHC experiments. To achieve this goal in a reasonable time scale the instantaneous luminosity would also increase by an order of magnitude up to 6 · 1034 cm-2s-1. The region of the forward muon spectrometer (|η| > 1.6) is not equipped with RPC stations. The increase of the expected particles flux up to 2 kHz/cm2 (including a safety factor 3) motivates the installation of RPC chambers to guarantee redundancy with the CSC chambers already present. The current CMS RPC technology cannot sustain the expected background level. The new technology that will be chosen should have a high rate capability and provide a good spatial and timing resolution. A new generation of Glass-RPC (GRPC) using low-resistivity glass is proposed to equip at least the two most far away of the four high η muon stations of CMS. First the design of small size prototypes and studies of their performance in high-rate particles flux are presented. Then the proposed designs for large size chambers and their fast-timing electronic readout are examined and preliminary results are provided.

  10. A configurable tracking algorithm to detect cosmic muon tracks for the CMS-RPC based technical trigger

    CERN Document Server

    Rajan, R T; Loddo, F; Maggi, M; Ranieri, A; Abbrescia, M; Guida, R; Iaselli, G; Nuzzo, S; Pugliese, G; Roselli, G; Trentadue, R; Tupputi, b, S; Benussi, L; Bertani, M; Bianco, S; Fabbri, F; Cavallo, N; Cimmino, e, A; Lomidze, D; Noli, P; Paolucci, P; Piccolo, D; Polese, G; Sciacca, C; Baesso, g, P; Belli, G; Necchi, M; Ratti, S P; Pagano, D; Vitulo, P; Viviani, C; Dimitrov, A; Litov, L; Pavlov, B; Petkov, P; Genchev, V; Iaydjiev, P; Bunkowski, K; Kierzkowski, K; Konecki, M; Kudla, I; Pietrusinski, M; Pozniak, K

    2009-01-01

    In the CERN CMS experiment at LHC Collider special trigger signals called Technical Triggers will be used for the purpose of test and calibration. The Resistive Plate Chambers (RPC) based Technical Trigger system is a part of the CMS muon trigger system and is designed to detect cosmic muon tracks. It is based on two boards, namely RBC (RPC Balcony Collector) and TTU (Technical Trigger Unit). The proposed tracking algorithm (TA) written in VHDL and implemented in the TTU board detects single or multiple cosmic muon tracks at every bunch crossing along with their track lengths and corresponding chamber coordinates. The TA implementation in VHDL and its preliminary simulation results are presented.

  11. Test beam Results of the Forward RPC Prototype Chamber for the CMS Muon Detector

    CERN Document Server

    Aftab, Zia; Hoorani, Hafeez R; Jan, J A; Khan, Mohammad Khalid; Solaija, Tariq

    2001-01-01

    A full size prototype of the second forward RPC station (RE2/2) for the CMS detector has been tested during the 2000 beam test. The prototype was exposed to high irradiation flux using the CERN Gamma Irradiation Facility (GIF) and the 200 GeV muon beam from X5 beamline. We have studied number of chamber parameters which are relevant for the trigger such as: time resolution, efficiency, cluster size and rate capability. We have used two different gas mixtures to understand the effect of SF6 on the efficiency plateau and the rate capability of the chamber. We have also studied the intrinsic chamber rate for different discrimination thresholds.

  12. MUON DETECTORS: RPC

    CERN Multimedia

    P. Paolucci

    2011-01-01

    The RPC muon detector and trigger are working very well, contributing positively to the high quality of CMS data. Most of 2011 has been used to improve the stability of our system and the monitoring tools used online and offline by the shifters and experts. The high-voltage working point is corrected, chamber-by-chamber, for pressure variation since July 2011. Corrections are applied at PVSS level during the stand-by mode (no collision) and are not changed until the next fill. The single detector calibration, HV scan, of February and the P-correction described before were very important steps towards fine-tuning the stability of the RPC performances. A very detailed analysis of the RPC performances is now ongoing and from preliminary results we observe an important improvements of the cluster size stability in time. The maximum oscillation of the cluster size run by run is now about 1%. At the same time we are not observing the same stability in the detection efficiency that shows an oscillation of about ...

  13. MUON DETECTORS: RPC

    CERN Multimedia

    P. Paolucci

    2011-01-01

    RPC detector calibration, HV scan Thanks to the high LHC luminosity and to the corresponding high number of muons created in the first part of the 2011 the RPC community had, for the first time, the possibility to calibrate every single detector element (roll).The RPC steering committee provided the guidelines for both data-taking and data analysis and a dedicated task force worked from March to April on this specific issue. The main goal of the RPC calibration was to study the detector efficiency as a function of high-voltage working points, fit the obtained “plateau curve” with a sigmoid function and determine the “best” high-voltage working point of every single roll. On 18th and 19th March, we had eight runs at different voltages. On 27th March, the full analysis was completed, showing that 60% of the rolls had already a very good fit with an average efficiency greater than 93% in the plateau region. To improve the fit we decided to take three more runs (15th April...

  14. MUON DETECTORS: RPC

    CERN Multimedia

    Pierluigi Paolucci

    2013-01-01

    In the second part of 2013 the two main activities of the RPC project are the reparation and maintenance of the present system and the construction and installation of the RE4 system. Since the opening of the barrel, repair activities on the gas, high-voltage and electronic systems are being done in parallel, in agreement with the CMS schedule. In YB0, the maintenance of the RPC detector was in the shadow of other interventions, nevertheless the scaffolding turned out to be a good solution for our gas leaks searches. Here we found eight leaking channels for about 100 l/h in total. 10 RPC/DT modules were partially extracted –– 90 cm –– in YB0, YB–1 and YB–2 to allow for the replacement of FE and LV distribution boards. Intervention was conducted on an additional two chambers on the positive endcap to solve LV and threshold control problems. Until now we were able to recover 0.67% of the total number of RPC electronic channels (1.5% of the channels...

  15. MUON DETECTORS: RPC

    CERN Multimedia

    P. Paolucci

    2012-01-01

      2011 data-taking was very satisfactory for both the RPC detector and trigger. The RPC system ran very smoothly in 2011, showing an excellent stability and very high data-tacking efficiency. Data loss for RPC was about 0.37%, corresponding to 19 pb−1. Most of the performance studies, based on 2011 data, are now completed and the results have been already approved by CMS to be presented at the RPC 2012 conference (February 2012 at LNF). During 2011, the number of disconnected chambers increased from six to eight corresponding to 0.8% of the full system, while the single-gap-mode chambers increased from 28 to 31. Most of the problematic chambers are due to bad high-voltage connection and electronic failures that can be solved only during the 2013-2014 Long Shutdown. 98.4% of the electronic channels were operational. The average detection efficiency in 2011 was about 95%, which was the same value measured during the HV scan done at the beginning of the 2011 data-taking. Efficiency has be...

  16. MUON DETECTORS: RPC

    CERN Multimedia

    P. Paolucci

    2013-01-01

      In 2013 the main activities of the RPC project are: maintenance and repair of the present system, RE4 chambers installation, and commissioning and upgrade of the online and offline software. About 25 FTE are working on the three items since January and will continue until the end of 2014. Three groups of physicists and technicians (HV, Gas and Front-End) are ready for the repair of the present system. Most of the equipment needed has been tested in the laboratory and is ready to be used at P5. The foreseen interventions have been included in the CMS schedule; they will begin in June 2013 and finish in summer 2014. DPG and Online experts are designing the upgrade of the RPC online and offline tools in order to integrate the new RE4 chambers and at the same time improve them using the experience from the 2010–2012 data-taking period. The RPC RE4 upgrade project is proceeding very well; it is on schedule and within the budget. 17 chambers have been built and tested at CERN, Ghent (Belg...

  17. MUON DETECTORS: RPC

    CERN Multimedia

    G. Iaselli

    2010-01-01

    During the technical stop, the RPC team was part of the CMS task force team working on bushing replacements in the Endcap cooling system, also validating the repairs in terms of connectivity (HV, LV and signal cables), and gas leak, on RE chambers. In parallel, the RPC team profited from the opportunity to cure several known problems: six chambers with HV problems (1 off + 5 single gaps) were recovered on both gaps; four known HV problems were localized at chamber level; additional temperature sensors were installed on cooling pipes on negative REs; one broken LV module in RE-1 was replaced. During the last month, the RPC group has made big improvements in the operations tools. New trigger supervisor software has substantially reduced the configuration time. Monitoring is now more robust and more efficient in providing prompt diagnostics. The detector has been under central DCS control for two weeks. Improvements have been made to both functionality and documentation and no major problems were found. Beam s...

  18. MUON DETECTORS: RPC

    CERN Multimedia

    P. Paolucci

    2011-01-01

    During data-taking in 2010 the RPC system behaviour was very satisfactory for both the detector and trigger performances. Most of the data analyses are now completed and many results and plots have been approved in order to be published in the muon detector paper. A very detailed analysis of the detector efficiency has been performed using 60 million muon events taken with the dedicated RPC monitor stream. The results have shown that the 96.3% of the system was working properly with an average efficiency of 95.4% at 9.35 kV in the Barrel region and 94.9% at 9.55 kV in the Endcap. Cluster size goes from 1.6 to 2.2 showing a clear and well-known correlation with the strip pitch. Average noise in the Barrel is less than 0.4 Hz/cm2 and about 98% of full system has averaged noise less then 1 Hz/cm2. A linear dependence of the noise versus the luminosity has been preliminary observed and is now under study. Detailed chamber efficiency maps have shown a few percent of chambers with a non-uniform efficiency distribu...

  19. Optimization, Synchronization, Calibration and Diagnostic of the RPC PAC Muon Trigger System for the CMS detector

    CERN Document Server

    Bunkowski, Karol

    2009-01-01

    The Compact Muon Solenoid is one of the four experiments that will analyse the results of the collisions of the protons accelerated by the Large Hadron Collider (LHC). The collisions of proton bunches occur in the middle of the CMS detector every 25 ns, i.e. with a frequency of 40 MHz. Such a high collision frequency is needed because the probability of interesting processes, which we hope to discover at the LHC (such as production of Higgs bosons or supersymmetric particles) is very small. The objects that are the results of the proton-proton collisions are detected and measured by the CMS detector. Out of each bunch crossing the CMS produces about 1 MB of data; 40 millions of bunch collisions per second give the data stream of 40 terabytes (1013) per second. Such a stream of data is practically not possible to record on mass storage, therefore the first stage of the analysis of the detector data is performed in real time by the dedicated trigger system. Its task is to select potentially interesting events (...

  20. Optimization, Synchronization, Calibration and Diagnostic of the RPC PAC Muon Trigger System for the CMS detector

    CERN Document Server

    Bunkowski, Karol

    2009-01-01

    The Compact Muon Solenoid is one of the four experiments that will analyse the results of the collisions of the protons accelerated by the Large Hadron Collider (LHC). The collisions of proton bunches occur in the middle of the CMS detector every 25 ns, i.e. with a frequency of 40 MHz. Such a high collision frequency is needed because the probability of interesting processes, which we hope to discover at the LHC (such as production of Higgs bosons or supersymmetric particles) is very small. The objects that are the results of the proton-proton collisions are detected and measured by the CMS detector. Out of each bunch crossing the CMS produces about 1 MB of data; 40 millions of bunch collisions per second give the data stream of 40 terabytes (1013) per second. Such a stream of data is practically not possible to record on mass storage, therefore the first stage of the analysis of the detector data is performed in real time by the dedicated trigger system. Its task is to select potentially interesting events (...

  1. Aging studies for the CMS RPC system

    CERN Document Server

    Eysermans, Jan

    2017-01-01

    Aging effects are studied for the Resistive Plate Chambers (RPC) at the Compact Muon Solenoid (CMS) experiment at the CERN Large Hadron Colider (LHC), which can manifest themselves during the High-Luminosity LHC (HL-LHC) running period. A dedicated consolidation program is set up using the CERN Gamma Irradiation Facility ++, where RPC detectors are exposed to a high gamma flux for a long term period equivalent to the HL-LHC operational time. Based on the past operational experience, the high background conditions are estimated and the RPC are tested under such circumstances. Several parameters are monitored as function of integrated charge and dedicated test beam periods allows measuring the detector efficiency as function of the background rate. In this work, an overview of the measurements which were performed for these studies is given. After having accumulated a significant amount of the total irradiation, no aging effects or degradation of the RPC detectors have been observed. These results suggest that ...

  2. MUON DETECTORS: RPC

    CERN Multimedia

    P. Paolucci

    2012-01-01

      Since the start of data-taking in 2012, the RPCs have been operating in a stable manner with average chamber efficiencies above 95%. At present, the number of missing electronic channels is 1.2%; the number of disconnected chambers is 9, while 34 chambers are in single-gap mode. All those numbers are stable since the 2011 run. So far in 2012 no luminosity has been lost due to RPCs. During the winter shutdown, link board protections have been installed everywhere and are working properly, which makes the system more robust than before. A new “gas resistance” measurement campaign showed a clear stability of this parameter, which is proportional to the gap resistivity. No differences with respect to 2011 were found. A new efficiency calculation method has been validated, where now only DT/CSC segments of high quality that are associated with a stand-alone muon track are used to reduce the effect of punch-through segments. With this method, the observed oscillations in the RPC e...

  3. MUON DETECTORS: RPC

    CERN Multimedia

    G. Iaselli

    During the last 3 months the RPC group has made impressive improvements in the refinement of the operation tools and understanding of the detector. The full barrel and part of the plus end cap participated systematically to global runs producing millions of trigger on cosmics. The main monitoring tools were robust and efficient in controlling the detector and in diagnosis of problems. After the refinement of the synchronization procedure, detailed studies of the chamber performances, as a function of high voltage and front-end threshold, were pursued. In parallel, new tools for the prompt analysis were developed which have enabled a fast check of the data at the CMS Centre. This effort has been very valuable since it has helped in discovering many minor bugs in the reconstruction software and database which are now being fixed. Unfortunately, a large part of the RE2 station has developed increasing operational current. Some preliminary investigation leads to the conclusion that the serial gas circulation e...

  4. MUON DETECTORS: RPC

    CERN Multimedia

    G. Pugliese

    2010-01-01

    In the second half of 2010 run, the overall behavior of the RPC system has been very satisfactory, both in terms of detector and trigger performance. This result was achieved through interventions by skilled personnel and fine-tuned analysis procedures. The hardware was quite stable: both gas and power systems did not present significant problems during the data-taking period, confirming the high reliability achieved. Only few interventions on some HV or LV channels were necessary during the periodical technical accesses. The overall result is given by the stable percentage of active channels at about 98.5%. The single exception was at beginning of the ion collisions, when it dipped to 97.4% because of the failure of one LV module, although this was recovered after a few days. The control and monitoring software is now more robust and efficient, providing prompt diagnostics on the status of the entire system. Significant efforts were made in collaboration with the CMS cooling team to secure proper working ...

  5. Analysis of RE4 Construction Cosmic Muon Test Data and Comparison with 2015 Collision Calibration Run Data for the Newly Installed RPC Chambers in the 4th Muon Endcap Station of the CMS Detector

    CERN Document Server

    Iqbal, Muhammad Ansar

    2015-01-01

    RPC are the heart of the muon system of CMS experiment at LHC, CERN. Recently a new endcap layer, RE4, was added to increase redundancy. These added chambers were tested during the construction period with cosmic muons in the 904 lab at Prevessin, CERN. This study analyzes the HV scan from those tests and compares them with the first 2015 collision data taken at Point-5. The analysis showed that most of the chambers were producing more than 90% efficiency and were in good agreement with the Point-5 results. Those which did not give good results were reported. Other variables like working point and maximum efficiency were also studied.

  6. MUON DETECTORS: RPC

    CERN Multimedia

    G. Iaselli

    The RPC group has invested a large effort in the study of trigger spikes observed during CRAFT data taking. The chambers are susceptible to noise generated by the flickering of fluorescent and projector lamps in the cavern (with magnetic field on). Soon after the end of CRAFT, it was possible to reproduce the phenomena using a waveform generator and to study possible modifications to be implemented in the grounding schema. Hardware actions have been already taken in order to reduce the detector sensitivity: star washers on the chamber front panels and additional shielding have been added where possible. During the shutdown maintenance activity many different problems were tackled on the barrel part. A few faulty high voltage connector/cable problems were fixed; now only two RPC chambers are left with single-gap mode operation. One chamber in YB+2 was replaced due to gas leakage. All the front-end electronic boards were replaced in 3 chambers (stations MB2 and MB3 in YB-2), that had been damaged after the coo...

  7. MUON DETECTORS: RPC

    CERN Multimedia

    G. Iaselli.

    Substantial progress has been made on the RPC system resulting in a high standard of operation. Impressive improvements have been made in the online software and DCS PVSS protocols that ensure robustness of the configuration phase and reliability of the detector monitoring tasks. In parallel, an important upgrade of CCU ring connectivity was pursued to avoid noise pick-up and consequent  data transmission errors during operation with magnetic field. While the barrel part is already well synchronized thanks to the long cosmics runs, some refinements are still required on the forward part. The "beam splashes" have been useful to cross check  the existing delay constants, but further efforts will be made as soon as a substantial sample of beam-halo events is available. Progress has been made on early detector performance studies. The RPC DQM tool is being extensively used and minor bugs have been found. More plots have been added and more people have been tr...

  8. MUON DETECTORS: RPC

    CERN Multimedia

    P. Paolucci

    2012-01-01

    The RPC system is operating with a very high uptime, an average chamber efficiency of about 95% and an average cluster size around 1.8. The average number of active channels is 97.7%. Eight chambers are disconnected and forty are working in single-gap mode due to high-voltage problems. The total luminosity lost due to RPCs in 2012 is 88.46 pb–1. One of the main goals of 2012 was to improve the stability of the endcap trigger that is strongly correlated to the performances of the detector, due to the 3-out-3 trigger logic. At beginning of 2011 the instability of the detector efficiency was about 10%. Detailed studies found that this was mainly due to the strong correlation between the performance of the detector and the atmospheric pressure (P). Figure XXY shows the linear correlation between the average cluster size of the endcap chamber versus P. This effect is expected for gaseous detectors and can be reduced by correcting the applied high-voltage working point (HVapp) according to the followi...

  9. MUON DETECTORS: RPC

    CERN Multimedia

    P. Paolucci

    2013-01-01

    During LS1, the Resistive Plate Chamber (RPC) collaboration is focusing its efforts on installation and commissioning of the fourth endcap station (RE4) and on the reparation and maintenance of the present system (1100 detectors). The 600 bakelite gaps, needed to build 200 double-gap RE4 chambers are being produced in Korea. Chamber construction and testing sites are located at CERN, in Ghent University, and at BARC (India). At present, 42 chambers have been assembled, 32 chambers have been successfully tested with cosmic rays runs and 7 Super Modules, made by two chambers, have been built at CERN by a Bulgarian/Georgian/Italian team and are now ready to be installed in the positive endcap. The 36 Super Modules needed to complete the positive endcap will be ready in September and installation is scheduled for October 2013. The Link-Board system for RE4 is under construction in Naples. Half of the system has been delivered at CERN in June. Six crates (Link-Board Boxes) and 75 boards, needed to instrument t...

  10. Study of gas purifiers in the CMS RPC detector

    CERN Document Server

    Saviano, Giovanna

    2010-01-01

    The CMS RPC muon detector utilizes a gas recirculation system (Closed Loop) to cope with high gas mixture volumes and costs. A systematic study of Closed Loop gas purifiers has been carried out in 2008 and 2009 at the ISR experimental area of CERN, with the use of RPC chambers with currents monitoring, and gas analysis sampling points. Results on contaminants release and purifier characterization are presented

  11. 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.

  12. R and D towards future CMS RPC upgrades

    CERN Document Server

    Fagot, Alexis

    2016-01-01

    High pseudo-rapidity region of CMS muon system is covered only by Cathode Strip Chambers (CSC) and lacks redundant coverage despite the fact that it is a challenging region for muons in terms of backgrounds and momentum resolution. In order to maintain good efficiency for the muon trigger in this region additional RPC are planned to be installed in stations RE31 and RE41. The stations will use RPCs with lower granularity but good timing resolution to mitigate background effects and complete the redundancy of the system. R and D activities will be presented in the talk.

  13. Study of gas purifiers for the CMS RPC detector

    CERN Document Server

    Benussi, L; Colafranceschi, S; Fabbri, F L; Felli, F; Ferrini, M; Giardoni, M; Greci, T; Paolozzi, A; Passamonti, L; Piccolo, D; Pierluigi, D; Russo, A; Saviano, G; Buontempo, S; Cimmino, A; de Gruttola, M; Fabozzi, F; Iorio, A O M; Lista, L; Paolucci, P; Baesso, P; Belli, G; Pagano, D; Ratti, S P; Vicini, A; Vitulo, P; Viviani, C; Guida, R; Sharma, A

    2012-01-01

    The CMS RPC muon detector utilizes a gas recirculation system called closed loop (CL) to cope with large gas mixture volumes and costs. A systematic study of CL gas purifiers has been carried out over 400 days between July 2008 and August 2009 at CERN in a low-radiation test area, with the use of RPC chambers with currents monitoring, and gas analysis sampling points. The study aimed to fully clarify the presence of pollutants, the chemistry of purifiers used in the CL, and the regeneration procedure. Preliminary results on contaminants release and purifier characterization are reported.

  14. Link board for CMS RPC-production issues

    Energy Technology Data Exchange (ETDEWEB)

    Banzuzi, K. [Lappeenranta University of Technology (Finland)], E-mail: Kukka.Banzuzi@oxinst.com; Iskanius, M.; Karjalainen, A.; Korpela, A.; Tuuva, T.; Vaeisaenen, V. [Lappeenranta University of Technology (Finland)

    2008-03-11

    This paper describes the work done in relation to putting a relatively high volume HEP readout electronics module into production. The main features of this fibre optic data transfer board designed for the Compact Muon Solenoid (CMS) Resistive Plate Chamber (RPC) detector are described, concentrating on how the final implementation was arrived at. An automated production testing method is introduced, and results are given of its efficiency in finding faulty boards and localising the faults.

  15. First joint test beam of CMS Drift Tubes (DT) and Resistive Plate Chambers (RPC)

    CERN Multimedia

    Paolo Giacomelli

    2001-01-01

    The first full size muon drift tube chamber ever built for the CMS barrel with the final cell design (constructed at CIEMAT, Madrid) was succesfully tested with a muon beam in September 2001 at the Gamma Irradiation Facility (GIF) at CERN. For the first time also both muon detectors for the CMS barrel (DT + RPC) were coupled together. The results of this test were fully succesful and confirmed the excellent performance of both detectors together in a radiation environment.

  16. RPC Overall Efficiency Measurement from Tracker Muons

    CERN Document Server

    CMS Collaboration

    2016-01-01

    From the Run-II, the RPCMuon reconstruction algorithm is included in the standard reconstruction, where the algorithm starts from the inner track and finds matched RPC hits(RPCRecHits) along its trajectory. The track extrapolation is done in this step and the results of extrapolation are stored in the muon objects. For the efficiency measurement using the track extrapolation in the RPCMuons, we require TrackerMuon identification on the muons. The TrackerMuon identification is done by extrapolating inner tracks to muon systems to find matching DT/CSC segments. The TrackerMuon and RPCMuon reconstruction are designed to run independently, to be complementary algorithms to each other. We use the tag-and-probe method to remove bias from the triggers - start from the SingleMuon dataset and require one muon(tag) to pass identification and isolation cuts but also require to be matched to the trigger object to accept the event. Then we select another muon(probe) in the event to study the efficiency, requiring Tracker...

  17. First results of CMS RPC performance at 13 TeV

    CERN Document Server

    Pedraza-Morales, M.I.; Shopova, M.

    2016-12-01

    The muon spectrometer of the CMS (Compact Muon Solenoid) experiment at the Large Hadron Collider (LHC) is equipped with a redundant system made of Resistive Plate Chambers (RPCs) and Drift Tube (DT) chambers in the barrel, RPC and Cathode Strip Chambers (CSCs) in the endcap region. In this paper, the first results of the performance of the RPC system during 2015 with the LHC running at 13 TeV is presented. The stability of the RPC performance, in terms of efficiency, cluster size and noise, is reported.

  18. Charge distribution dependency on gap thickness of CMS endcap RPC

    CERN Document Server

    Park, Sung Keun

    2016-01-01

    We present a systematic study of charge distribution dependency of CMS Resistive Plate Chamber (RPC) on gap thickness.Prototypes of double-gap with five different gap thickness from 1.8mm to 1.0mm in 0.2mm steps have been built with 2mm thick phenolic high-pressure-laminated (HPL) plates. The charges of cosmic-muon signals induced on the detector strips are measured as a function of time using two four-channel 400-MHz fresh ADCs. In addition, the arrival time of the muons and the strip cluster sizes are measured by digitizing the signal using a 32-channel voltage-mode front-end-electronics and a 400-MHz 64-channel multi-hit TDC. The gain and the input impedance of the front-end-electronics were 200mV/mV and 20 Ohm, respectively.

  19. The CMS Barrel Muon Trigger Upgrade

    CERN Document Server

    Triossi, Andrea

    2016-01-01

    ABSTRACT: The increase of luminosity expected by LHC during Phase 1 will impose several constrains for rate reduction while maintaining high efficiency in the CMS Level 1 trigger system. The TwinMux system is the early layer of the muon barrel region that concentrates the information from different subdetectors DT, RPC and HO. It arranges and fan-out the slow optical trigger links from the detector chambers into faster links (10 Gbps) that are sent to the track finders. Results, from collision runs, that confirm the satisfactory operation of the trigger system up to the output of the barrel track finder, will be shown. SUMMARY: In view of the increase of luminosity during phase 1 upgrade of LHC, the muon trigger chain of the Compact Muon Solenoid (CMS) experiment underwent considerable improvements. The muon detector was designed for preserving the complementarity and redundancy of three separate muon detection systems, Cathode Strip Chambers (CSC), Drift Tubes (DT) and Resistive Plate Chambers (RPC), until ...

  20. Detector Control System and Efficiency Performance for CMS RPC at GIF++

    CERN Document Server

    Gul, Muhammad; Cimmino, A; Crucy, S; Fagot, A; Rios, A A O; Tytgat, M; Zaganidis, N; Aly, S; Assran, Y; Radi, A; Sayed, A; Singh, G; Abbrescia, M; Iaselli, G; Maggi, M; Pugliese, G; Verwilligen, P; Doninck, W V; Colafranceschi, S; Sharma, A; Benussi, L; Bianco, S; Piccolo, D; Primavera, F; Bhatnagar, V; Kumari, R; Mehta, A; Singh, J; Ahmad, A; Asghar, M I; Muhammad, S; Awan, I A; Hoorani, H R; Ahmed, W; Shahzad, H; Shah, M A; Cho, S W; Choi, S Y; Hong, B; Kang, M H; Lee, K S; Lim, J H; Park, S K; Kim, M; Goutzvitz, M; Grenier, G; Lagarde, F; Estrada, C U; Pedraza, I; Severiano, C B; Carrillo Moreno, S; Vazquez Valencia, F; Pant, L M; Buontempo, S; Cavallo, N; Esposito, M; Fabozzi, F; Lanza, G; Lista, L; Meola, S; Merola, M; Orso, I; Paolucci, P; Thyssen, F; Braghieri, A; Magnani, A; Montagna, P; Riccardi, C; Salvini, P; Vai, I; Vitulo, P; Ban, Y; Qian, S J; Choi, M; Choi, Y; Goh, J; Kim, D; Aleksandrov, A; Hadjiiska, R; Iaydjiev, P; Rodozov, M; Stoykova, S; Sultanov, G; Vutova, M; Dimitrov, A; Litov, L; Pavlov, B; Petkov, P; Lomidze, D; Bagaturia, I; Avila, C; Cabrera, A; Sanabria, J C; Crotty, I; Vaitkus, J

    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.

  1. CMS RPC detectors assembled in Pakistan installed on the backside of the YE+1 endcap yoke

    CERN Multimedia

    Walter Van Doninck, VUB-Brussels and CERN

    2006-01-01

    Resistive Plate Chambers (RPCs) are sensitive to the passage of muons and provide a "trigger" signal for CMS. This image shows RPC detectors, which were assembled in Pakistan, installed on the backside of an endcap yoke disc, known as YE+1.

  2. Study of the performance of RPC system installed at the CMS experiment

    CERN Document Server

    SHOPOVA, Mariana

    2016-01-01

    The CMS (Compact Muon Solenoid) experiment is a general purpose detector, located at the CERN Large Hadron Collider (LHC). It has a muon spectrometer equipped with a redundant system composed of three different detector technologies - Resistive Plate Chambers (RPCs) and Drift Tubes (DTs) in the barrel and RPC and Cathode Strip Chambers (CSCs) in the endcap region. All three are used for muon reconstruction and triggering. The RPC detector system consists of a total of 1056 double-gap chambers, covering the pseudo-rapidity region up to eta below 1.6. Here are presented the Resistive Plate Chambers performance results for the period of 2015 and 2016 with pp collisions at 13 TeV. The stability of the RPC performance is reported in terms of efficiency, cluster size and rate distributions.

  3. 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...

  4. Data-driven performance evaluation method for CMS RPC trigger system using 2011 data at LHC

    Indian Academy of Sciences (India)

    A Sharma; S B Beri; on behalf of the CMS Collaboration

    2012-10-01

    The compact muon solenoid (CMS) is one of the four experiments which is getting and analysing the results of the collision of protons at LHC. The CMS trigger system is divided into two stages, the level-1 trigger and high-level triggers, to handle the large stream of data produced in collision. The information transmitted from the three muon subsystems (DT, CSC and RPC) are collected by the Global Muon Trigger (GMT) Board and merged. A method for evaluating the RPC system trigger efficiency with data from collision was developed using the features of GMT. The results of the study with the real data of 2011 are shown and discussed here along with the comparison of Monte Carlo results

  5. First results of CMS RPC performance at 13 TeV

    CERN Document Server

    Pedraza Morales, Maria Isabel

    2016-01-01

    In May 2015, the Large Hadron Collider (LHC) at CERN, collided, for the first time, protons at the record-breaking center-of-mass energy of 13TeV. The LHC restarted after a two-year technical stop, know as Long Shutdown 1 (LS1), needed for servicing and consolidating the CERN accelerator complex. The Compact Muon Solenoid detector, a general-purpose detector at LHC, benefited from LS1 by performing crucial tasks necessary to operate the detector at higher energies. In particular, the Resistive Plate Chamber (RPC) system, one of the three muon detector technologies in CMS, was serviced, re-commissioned, and upgraded with 144 new chambers to enhance muon trigger efficiency. The CMS RPC collaborations has exploited early data samples at 13TeV for detector performance studies. These data allowed for a first characterization of the newly installed chambers. The results obtained are presented here.

  6. R&D; towards future upgrade of the CMS RPC system

    CERN Document Server

    Pugliese, Gabriella

    2016-01-01

    The CMS experiment at the CERN Large Hadron Collider (LHC) is equipped with a redundant muon trigger system based on Drift Tubes Chambers (DT) in the barrel region and Cathode Strip Chamber (CSC) in the endcap regions and Resistive Plate Chambers (RPC) in both regions up to | η | = 1.6. In view of the High Luminosity LHC (HL-LHC) phase, to keep the same muon performance new muon stations will be installed in the forward region (1.6< | η | <2.4) and in the very forward region up to | η | = 2.8. The 3th and 4th stations will be equipped with a new generation of RPC with improved performance (iRPC), capable of handling the challenging con- ditions expected at the HL-LHC. An extensive R&D; program has been undertaken to define the detector design and related electronics that meet the HL-LHC requirements. A summary of iRPC performance results is here reported.

  7. The Upgrade of the CMS RPC System during the First LHC Long Shutdown

    CERN Document Server

    Tytgat, M.; Verwilligen, P.; Zaganidis, N.; Aleksandrov, A.; Genchev, V.; Iaydjiev, P.; Rodozov, M.; Shopova, M.; Sultanov, G.; Assran, Y.; Abbrescia, M.; Calabria, C.; Colaleo, A.; Iaselli, G.; Loddo, F.; Maggi, M.; Pugliese, G.; Benussi, L.; Bianco, S.; Caponero, M.; Colafranceschi, S.; Felli, F.; Piccolo, D.; Saviano, G.; Carrillo, C.; Berzano, U.; Gabusi, M.; Vitulo, P.; Kang, M.; Lee, K.S.; Park, S.K.; Shin, S.; Sharma, A.

    2012-01-01

    The CMS muon system includes in both the barrel and endcap region Resistive Plate Chambers (RPC). They mainly serve as trigger detectors and also improve the reconstruction of muon parameters. Over the years, the instantaneous luminosity of the Large Hadron Collider gradually increases. During the LHC Phase 1 (~first 10 years of operation) an ultimate luminosity is expected above its design value of 10^34/cm^2/s at 14 TeV. To prepare the machine and also the experiments for this, two long shutdown periods are scheduled for 2013-2014 and 2018-2019. The CMS Collaboration is planning several detector upgrades during these long shutdowns. In particular, the muon detection system should be able to maintain a low-pT threshold for an efficient Level-1 Muon Trigger at high particle rates. One of the measures to ensure this, is to extend the present RPC system with the addition of a 4th layer in both endcap regions. During the first long shutdown, these two new stations will be equipped in the region |eta|<1.6 with...

  8. Future of the CMS Muon System Upgrades and Aging

    CERN Document Server

    Pilot, Justin Robert

    2016-01-01

    The CMS detector currently includes three different muon detector types drift tubes (DT) in the central region, cathode strip chambers (CSC) in the forward regions, and resistive plate chambers (RPC) in both the forward and central regions. Several upgrade projects are planned to maintain high data-taking efficiency with the planned running conditions for the high-luminosity upgrade of the LHC. These upgrades are designed to ensure detector longevity and increase redundancy, while mitigating rate increases and retaining sensitivity to phyics processes. This involves changes to electronics and infrastructure of existing detectors, and adding new detectors in the forward region of the CMS experiment. Plans for each of the muon subsystems are described here in the context of the Phase-II upgrade schedule of the CMS experiment.

  9. CMS - The Compact Muon Solenoid

    CERN Multimedia

    Bergauer, T; Waltenberger, W; Kratschmer, I; Treberer-treberspurg, W; Rahbaran, B; Escalante del valle, A; Andreeva, I; Innocente, V; Camporesi, T; Malgeri, L; Marchioro, A; Moneta, L; Weingarten, W; Beni, N T; Cimmino, A; Rovere, M; Castello, R; Jafari, A; Lange, C G; Gilbert, A J; Pantaleo, F; Reis, T; Favre-felix, R J R; Cucciati, G; Alipour tehrani, N; Stakia, A; Fallavollita, F; Pizzichemi, M; Pinna, D; Rauco, G; Zhang, S; Hu, T; Yazgan, E; Zhang, H; Thomas-wilsker, J; Reithler, H K V; Philipps, B; Merschmeyer, M K; Heidemann, C A; Mukherjee, S; Geenen, H; Kuessel, Y; Weingarten, S; Nehrkorn, A; Gallo, E; Schwanenberger, C; Walsh bastos rangel, R; Beernaert, K S; Connor, P; Lelek, A A; Wichmann, K H; Myronenko, V; Kovalchuk, N; Bein, S L; Dreyer, T; Scharf, C; Quast, G; Dierlamm, A H; Barth, C; Mol, X; Kudella, S; Schafer, D; Schimassek, R R; Matorras, F; Calderon tazon, A; Garcia ferrero, J; Bercher, M J; Sirois, Y; Jo, M; Antropov, I; Callier, S; Depasse, P; Laktineh, I B; Grenier, G; Boudoul, G; Heath, G P; Brooke, J J; Hartley, D A; Beck, L M G; Quinton, S; Tomalin, I R; Harder, K; Francis, V B; Thea, A; Zhang, Z; Loukas, D; Hernath, S T; Naskar, K; Colaleo, A; Maggi, G P; Maggi, M; Loddo, F; Calabria, C; Campanini, R; Cuffiani, M; D'antone, I; Grandi, C; Guiducci, L; Tosi, N; Gulmini, M; Longo, E; Gelli, S; Schizzi, A; Cho, S; Ha, S; Kim, D H; Kim, G N; Md halid, M F B; Yusli, M N B; Dominik, W M; Bunkowski, K; Olszewski, M; Byszuk, A P; Rasteiro da silva, J C; Varela, J; Leong, Q; Sulimov, V; Vorobyev, A; Denisov, A; Murzin, V; Egorov, A; Lukyanenko, S; Postoev, V; Pashenkov, A; Solovey, A; Rubakov, V; Troitsky, S; Kirpichnikov, D; Lychkovskaya, N; Safronov, G; Fedotov, A; Toms, M; Barniakov, M; Olimov, K; Fazilov, M; Umaraliev, A; Dumanoglu, I; Bakirci, N M; Dozen, C; Demiroglu, Z S; Oglakci, M; Isik, C; Zeyrek, M; Yalvac, M; Ozkorucuklu, S; Chang, Y; Dolgopolov, A; Gottschalk, E E; Maeshima, K; Heavey, A E; Kramer, T; Kwan, S W L; Taylor, L; Tkaczyk, S M; Mokhov, N; Marraffino, J M; Mrenna, S; Yarba, V; Banerjee, B; Elvira, V D; Gray, L A; Holzman, B; Dagenhart, W; Canepa, A; Ryu, S C; Strobbe, N C; Adelman-mc carthy, J K; Contescu, A C; Andre, J O; Wu, J; Bucinskaite, I; Zhang, J; Karchin, P E; Thapa, P; Zaleski, S G; Dishaw, A L; Gran, J L; Wang, S; Patterson, A S; Zilizi, G; Raics, P P; Bhardwaj, A; Smiljkovic, N; Stojanovic, M; Brandao malbouisson, H; De oliveira martins, C P; Tonelli manganote, E J; Medina jaime, M; Thiel, M; Laurila, S H; Wu, X; Graehling, P; Tonon, N; Blekman, F; De bruyn, I H J; Postiau, N J S; Leroux, P J; Van remortel, N; Janssen, X J; Di croce, D; Aleksandrov, A; Shopova, M F; Dogra, S M; Shinoda, A A; Arce, P; Daniel, M; Navarrete marin, J J; Redondo fernandez, I; Guirao elias, A; Cela ruiz, J M; Lottin, J; Gras, P; Kircher, F; Levesy, B; Payn, A; Guilloux, F; Negro, G; Leloup, C; Pasztor, G; Bhatnagar, V; Maity, M; Bruzzi, M; Sciortino, S; Starodubtsev, O; Sciacca, C; Meola, S; Berruti, G M; Saccomanno, A; Azzi, P; Conti, E; 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Kucher, I; Contardo, D C; Lumb, N; Baulieu, G; Lagarde, F; Figueiredo marques, B E; Heath, H F; Kreczko, L; Clement, E J; Paramesvaran, S; Bologna, S; Bell, K W; Moretti, S; Hill, J A; Durkin, T J; Calligaris, L; Daskalakis, G; Kataria, S K; Iaselli, G; Pugliese, G; My, S; Sharma, A; Abbiendi, G; Taneja, S; Benussi, L; Fabbri, F; Calvelli, V; Frizziero, E; Barone, L M; De notaristefani, F; Rahatlou, S; D'imperio, G; Preiato, F; Gobbo, B; Jo, Y; Gyun, D; Yusupov, H; Liew, C S; Zabolotny, W M; Sobolev, S; Gavrikov, Y; Kozlov, I; Golubev, N; Andreev, Y; Tlisov, D; Zaytsev, V; Stepennov, A; Popova, E; Aushev, T; Kolchanova, A; Shtol, D; Sirunyan, A; Gokbulut, G; Kara, O; Damarseckin, S; Guler, A M; Ozpineci, A; Hayreter, A; Li, S; Gruenendahl, S; Yarba, J; Para, A; Ristori, L F; Ronzhin, A I; Rubinov, P M; Reichanadter, M A; Churin, I; Beretvas, A; Muzaffar, S M; Lykken, J D; Gutsche, O; Baldin, B; Uplegger, L A; Lei, C M; Wu, W; Derylo, G E; Ruschman, M K; Lipton, R J; Whitbeck, A J; Schmitt, R; Contreras pasuy, L C; Olsen, J T; Cavanaugh, R J; Betts, R R; Wang, H; Sturdy, J T; Gutierrez jr, A; Campagnari, C F; White, D T; Brewer, F D; Qu, H; Ranjan, K; Naimuddin, M; Lalwani, K; Md, H; Shah, A H; Fonseca de souza, S; De jesus damiao, D; Revoredo, E A; Chinellato, J A; Amadei marques da costa, C; Lampen, P T; Wendland, L A; Brom, J; Andrea, J; Tavernier, S; Van doninck, W K; Van mulders, P K A; Clerbaux, B; Brun, H L; Rougny, R; Lauwers, J G E; Dimitrov, L; Rashevski, G D; Rodozov, M N; Padula, S; Bernardes, C A; Dias maciel, C; Deiters, K; Feichtinger, D; Wiederkehr, S A; Cerrada, M; Fouz iglesias, M; Senghi soares, M; Pasquetto, E; Ferry, S C; Georgette, Z; Malcles, J; Filipovic, N; Lal, M K; Walia, G; Kaur, A; Ciulli, V; Lenzi, P; Chatterjee, K; Lanza, G; Dosselli, U; Gasparini, F; Zanetti, M; Ressegotti, M; Costa, M; Dughera, G; Ramirez sanchez, G; Frueboes, T M; Karjavine, V; Skachkov, N; Litvinenko, A; Petrosyan, A; Teryaev, O; Trofimov, V; Makankin, A; Golunov, A; Savrin, V; Korotkikh, V; Vardanyan, I; Lukina, O; Belyaev, A; Korneeva, N; Petukhov, V; Skvortsov, V; Efremov, V; Smirnov, N; Shiu, J; Rohlf, J; Sulak, L R; St john, J M; Morse, D M; Krajczar, K F; Mironov, C M; Niu, X; Wang, J; Charaf, O; Matveev, M; Eppley, G W; Guilbaud, M R J; Mccliment, E R; Ozok, F; Bilki, B; Zieser, A J; Olivito, D J; Vartak, A; Wood, J G; Welke, C V; Hashemi, B T; Bean, A L; Wang, Q; Sheldon, P D; Tuo, S; Xu, Q; Roberts, J W; Pena herrera, C I; Anderson, D J; Lath, A; Jacques, P; Thomassen, P; Sun, M; Andrews, M B; Svyatkovskiy, A; Heintz, U; Lee, J; Wei, H; Wang, L; Prosper, H B; Adams, J R; Cai, J; Liu, S; Wang, D; Zhang, Z; Swanson, D; Thiltges, J F; Cowden, C S; Undleeb, S; Finger, M; Beuselinck, R; Hall, G; Tapper, A D; Malik, S A; Haddad, Y; Lane, R C; Panagiotou, A; Diamantopoulou, M; Mallios, S; Dey, S; Mondal, K; Bhattacharya, R; Bhowmik, D; Libby, J F; Azzurri, P; Foa, L; Tenchini, R; Verdini, P G; Ciampa, A; Manca, E; Radburn-smith, B C; Park, J; Swartz, M L; Sarica, U; Borcherding, F O; Dolen, J W; Barria, P; Goadhouse, S D; Xia, F; Joyce, M L; Belloni, A; Bouhali, O; Castaneda hernandez, A M; Toback, D; Osipenkov, I L; Almes, G T; Walker, J W; Bylsma, B G; Conway, J S; Tripathi, S M; Mc lean, C A; Flores, C S; Avery, P R; Terentyev, N; Barashko, V; Ryd, A P E; Tucker, J M; Heltsley, B K; Wittich, P; Riley, D S; Skinnari, L A; Chu, J Y; Ignatenko, M; Lindgren, M A; Saltzberg, D P; Peck, A N; Herve, A A M; Loveless, R; Savin, A; Herndon, M F; Mason, W P; Martirosyan, S; Grahl, J; Hansen, P D; Saradhy, R; Mueller, C N; Suh, I S; Hurtado anampa, K P; De barbaro, P J; Garcia-bellido alvarez de miranda, A A; Korjenevski, S K; Moolekamp, F E; Fallon, C T; Acosta castillo, J G; Gutay, L; Barker, A W; Gough, E; Poyraz, D; Van driessche, W G M; Verbeke, W L M; Beniozef, I S; Krasteva, R L; Winn, D R; Fenyvesi, A C; Makovec, A; Munro, C G; Sanchez cruz, S; Bernardino rodrigues, N A; Lokhovitskiy, A; Uribe estrada, C; Rivera martinez, R C; Rebane, L; Racioppi, A; Kim, H; Kim, T; Puljak, I; Boyaryntsev, A; Saeed, M; Tanwir, S; Butt, U; Hussain, A; Nawaz, A; Khurshid, T; Imran, M; Sultan, A; Naeem, M; Veckalns, V; Kaadze, K; Modak, A; Taylor, R D; Kim, D; Grab, C; Nessi-tedaldi, F; Baeni, L; Fischer, J; Zagozdzinska-bochenek, A A; Berger, P; Reichmann, M P; Hashemi, M; Rezaei hosseinabadi, F; Mehrabpour, H; Paganoni, M; Farina, F M; Ciriolo, V; Joshi, Y R; Avila bernal, C A; Cabrera mora, A L; Segura delgado, M A; Gonzalez hernandez, C F; Asavapibhop, B; U-ruekolan, S; Kim, G; Choi, M; Liu, H; Aly, S; Sawy, F H; Elkomous mekhail, A E; El sawy, M; Aboamer, O; Branson, A B; Munir, K; Shamdasani, J; Rao, A M; Martin, F; Tavkhelidze, D; Hegde, V; Bylinkin, A; Aziz, T; Sur, N; Sutar, B J; Sarkar, T; Ghete, V M; Dragicevic, M G; Brandstetter, J; Marques moraes, A; Molina insfran, J A; Aspell, P; Baillon, P; Barney, D; Delikaris, D; Honma, A; Pape, L; Sakulin, H; Macpherson, A L; Bangert, N; Guida, R; Petrova, P; De gruttola, M; Steggemann, J; Voutsinas, G G; Verweij, M; Da silva gomes, D; Ben mimoun bel hadj, F; Bonnaud, J Y R; Canelli, F M; Bai, J; Qiu, J; Bian, J; Cheng, Y; Kukulies, C; Teroerde, M; Erdmann, M; Hebbeker, T; Zantis, F; Scheuch, F; Erdogan, Y; Campbell, A J; Kasemann, M; Lange, W; Raspiareza, A; Melzer-pellmann, I; Aldaya martin, M; Lewendel, B; Schmidt, R S; Lipka, E; Missiroli, M; Grados luyando, J M; Shevchenko, R; Babounikau, I; Steinbrueck, G; Peiffer, T; Vanhoefer, A; Ebrahimi, A; Stover, M; Niedziela, M A; Simonis, H J; Katkov, I; Colombo, F; Marco de lucas, R J; Lopez virto, A M; Jaramillo echeverria, R W; Hennion, P; Zghiche, A; Chiron, A; Romanteau, T; Beaudette, F; Valiyavalappil kizhakkepura, A A; Lobanov, A; Grasseau, G J; Pigard, P; Cadamuro, L; Pierre-emile, T B; El mamouni, H; Gouzevitch, M; Goldstein, J; Cussans, D G; Seif el nasr, S A; Smith, D; Titterton, A S; Ford, P J W; Olaiya, E O; Salisbury, J G; Paspalaki, G; Hidas, P; Kiss, T N; Zalan, P; Bartok, M; Shukla, P; Abbrescia, M; De filippis, N; Donvito, G; Radogna, R; Miniello, G; Gelmi, A; Capiluppi, P; Marcellini, S; Odorici, F; Bonacorsi, D; Genta, C; Ferri, G; Saviano, G; Ferrini, M; Minutoli, S; Fabbricatore, P; Tosi, S; Diemoz, M; Baccaro, S; Bartoloni, A; Margaroli, F; Talamo, I G; Kim, J Y; Oh, G; Lim, J H; Lee, J; Mohamad idris, F B; Md ali, M A B; Gani, A B; Cwiok, M; Doroba, K; Pyskir, A D; Martins galinhas, B E; Kim, V; Krivshich, A; Vorobyev, A; Ivanov, Y; Tarakanov, V; Lobodenko, A; Obikhod, T; Isayev, O; Kurov, O; Leonidov, A; Lvova, N; Kirsanov, M; Suvorova, O; Karneyeu, A; Demidov, S; Konoplyannikov, A; Popov, V; Pakhlov, P; Vinogradov, S; Klemin, S; Blinov, V; Skovpen, I; Chatrchyan, S; Grigorian, N; Kayis topaksu, A; Sunar cerci, D; Hos, I; Girgis chyla, S; Guler, Y; Kiminsu, U; Serin, M; Deniz, M; Turan, I; Eryol, F; Pozdnyakov, A; Liu, Z; Doan, T H; Hanlon, J E; Mcbride, P L; Pal, I; Verzocchi, M; Garren, L; Oleynik, G; Harris, R M; Bolla, G; Kowalkowski, J B; Evans, D E; Vaandering, E W; Patrick, J F; Rechenmacher, R; Prosser, A G; Messer, T A; Tiradani, A R; Rivera, R A; Jayatilaka, B A; Duarte, J M; Todri, A; Harr, R F; Richman, J D; Bhandari, R; Dordevic, M; Cirkovic, P; Mora herrera, C; Rosa lopes zachi, A; De paula carvalho, W; Kinnunen, R L A; Lehti, S T; Maeenpaeae, T H; Bloch, D; Chabert, E C; Rudolf, N G; Devroede, O; Skovpen, K; Deroover, K; Moreels, L; Lontkovskyi, D; Lenzi, T; De wolf, E A; Van mechelen, P; Van spilbeeck, A B E; Georgiev, L S; Novaes, S F; Vaz da silva filho, M; Costa, M A; Costa leal, B; Horisberger, R P; De la cruz, B; Willmott, C; Perez-calero yzquierdo, A M; Dejardin, M M; Mehta, A; Barbagli, G; Focardi, E; Lista, L; Passeggio, G; Thyssen, F D M; Breglio, G; Bacchetta, N; Gasparini, U; Pantano, D; Sgaravatto, M; Ventura, S; Zotto, P; Candelori, A; Pozzobon, N; Boletti, A; Benato, L; Magnani, A; Servoli, L; Postolache, V; Rossi, A; Ciangottini, D; Alunni solestizi, L; Maselli, S; Migliore, E; Amapane, N C; Shchelina, K; Lopez fernandez, R; Sanchez hernandez, A; Heredia de la cruz, I; Matveev, V; Kracikova, T; Shmatov, S; Vasilev, S; Kurenkov, A; Oleynik, D; Verkheev, A; Voytishin, N; Proskuryakov, A; Bogdanova, G; Petrova, E; Bagaturia, I; Tsamalaidze, Z; Fiori, F; Zhao, Z; Arcaro, D J; Barberis, E; Wamorkar, T; Wang, B; Ralph, D K; Velasco, M M; Anastassov, A I; Odell, N J; Sevova, S; Li, W; Merlo, J; Onel, Y; Mermerkaya, H; Moeller, A R; Haytmyradov, M; Dong, R; Bugg, W M; Ragghianti, G C; Delannoy sotomayor, A G; Thapa, K; Yagil, A; Gerosa, R A; Schmitz, E J; Kapustinsky, J S; Greene, S V; Zhang, L; Vlimant, J V; Mughal, A; Cury siqueira, S; Gershtein, Y; Arora, S R R; Lin, W X; Stickland, D P; Mc donald, K T; Pivarski, J M C; Higginbotham, S L; Rosenfield, M; Long, O R; Johnson, K F; Adams, T; Susa, T; Rykaczewski, H; Ge, Y; Liu, S; Li, J; Li, L; Bloom, K A; Monroy montanez, J A; Kunori, S; Wang, Z; Favart, D; Maltoni, F; Vidal marono, M; Francois, B A L; Delcourt, M; Markov, S I; Seez, C; Richards, A J; Ferguson, W; De wit, A M; Saoulidou, N; Chatziangelou, M; Karathanasis, G; Kontaxakis, P; Jones, J A; Strologas, J; Katsoulis, P; Dutt, S; Roy chowdhury, S; Bhardwaj, R; Purohit, A; Singh, B; Behera, P K; Spagnolo, P; Tonelli, G E; Fedi, G; Giannini, L; Poulios, S; Groote, J F; Untuc, B; Oztirpan, F O; Koseoglu, I; Luiggi lopez, E E; Krohn, M D; Hadley, N J; Shin, Y H; Safonov, A; Eusebi, R; Rose, A K; Erbacher, R D; Funk, G N; Pilot, J R; Klimenko, S; Matchev, K; Gleyzer, S; Wang, J; Bortignon, P; Curry, D A; Sun, W M; Soffi, L; Lantz, S R; Wright, D; Cline, D; Cousins jr, R D; Yang, X; Schnaible, C J; Dasgupta, A; Bradley, D C; Duric, S; Monzat, D; Dodd, L M; Tikalsky, J L; Kapusta, J; Gilbert, W J; Lesko, Z J; Marinelli, N; Wayne, M R; Heering, A H; Galanti, M; Han, J Y; Duh, Y; Roy, A; Arabgol, M; Hacker, T J; Salva, S; Petrov, V; Barychevski, V; Drobychev, G; Lobko, A; Conte, E R E; Kasprowicz, G H; Kyberd, P; Cole, J E; Reid, I D; Lopez, J M; Salazar gonzalez, C A; Benzon, A M; Pelagio, L; Walsh, M F; Carpinteyro bernardino, S; Postnov, A; Lelas, D; Vaitkus, J V; Jurciukonis, D; Bacevieius, G; Sulmanas, B; Ahmad, A; Ahmed, W; Jalil, S H; Kahl, W E; Taylor, D R; Choi, Y I; Roy, T; Guerrero ibarra, D F; Schoenenberger, M A; Khateri, P; Safarzadeh samani, B; Etesami, S M; Fiorini, E; Pullia, A; Magni, S; Fiorendi, S; Sanabria arenas, J C; Florez bustos, C A; Holguin coral, A; Mendez, H; Srimanobhas, N; Jaikar, A H; Arteche gonzalez, F J; Call, K R; Calderon monroy, M A; Bakhet, N; Aly mohamed mahmoud mohamed, R; Elkafrawy, T; Hammad, A H A; Abdelmaguid, A; Mal, P K; Yuan, L; Al kindi, A; Lomidze, I; Prangishvili, I; Adamov, G; Dube, S S; Dugad, S; Mohanty, G B; Bhat, M A; Bheesette, S; Abou kors, D J; Nakad, Z S

    CMS is a general purpose proton-proton detector designed to run at the highest luminosity at the LHC. It is also well adapted for studies at the initially lower luminosities. The CMS Collaboration consists of over 1800 scientists and engineers from 151 institutes in 31 countries. The main design goals of CMS are: \\begin{enumerate} \\item a highly performant muon system, \\item the best possible electromagnetic calorimeter \\item high quality central tracking \\item hermetic calorimetry \\item a detector costing less than 475 MCHF. \\end{enumerate} All detector sub-systems have started construction. Engineering Design Reviews of parts of these sub-systems have been successfully carried-out. These are held prior to granting authorization for purchase. The schedule for the LHC machine and the experiments has been revised and CMS will be ready for first collisions now expected in April 2006. \\\\\\\\ ~~~~$\\bullet$ Magnet \\\\ The detector (see Figure) will be built around a long (13~m) and large bore ($\\phi$=5.9~m) high...

  10. R&D towards the CMS RPC Phase-2 upgrade

    CERN Document Server

    Fagot, A; Cimmino, A; Gul, M.; Rios, A.A.O.; Tytgat, M.; Zaganidis, N.; Aly, S.; Assran, Y.; Radi, A.; Sayed, A.; Singh, G.; Abbrescia, M.; Iaselli, G.; Maggi, M.; Pugliese, G.; Verwilligen, P.; Van Doninck, W.; Colafranceschi, S.; Sharma, A.; Benussi, L.; Bianco, S.; Piccolo, D.; Primavera, F.; Bhatnagar, V.; Kumari, R.; Mehta, A.; Singh, J.; Ahmad, A.; Ahmed, W.; Asghar, M.I.; Awan, I.M.; Hoorani, H.R.; Muhammad, S.; Shah, M.A.; Shahzad, H.; Cho, S.W.; Choi, S.Y.; Hong, B.; Kang, M.H.; Lee, K.S.; Lim, J.H.; Park, S.K.; Kim, M.S.; Gouzevitch, M.; Grenier, G.; Lagarde, F.; Laktineh, I.B.; Bernardino, S.Carpinteyro; Estrada, C.Uribe; Pedraza, I.; Carrillo Moreno, S.; Vazquez Valencia, F.; Pant, L.M.; Buontempo, S.; Cavallo, N.; Esposito, M.; Fabozzi, F.; Lanza, G.; Orso, I.; Lista, L.; Meola, S.; Merola, M.; Paolucci, P.; Thyssen, F.; Braghieri, A.; Magnani, A.; Montagna, P.; Riccardi, C.; Salvini, P.; Vai, I.; Vitulo, P.; Ban, Y.; Qian, S.J.; Choi, M.; Choi, Y.; Goh, J.; Kim, D.; Aleksandrov, A.; Hadjiiska, R.; Iaydjiev, P.; Rodozov, M.; Stoykova, S.; Sultanov, G.; Vutova, M.; Dimitrov, A.; Litov, L.; Pavlov, B.; Petkov, P.; Bagaturia, I.; Lomidze, D.; Avila, C.; Cabrera, A.; Sanabria, J.C.; Crotty, I.; Vaitkus, J.

    2016-01-01

    The high pseudo-rapidity region of the CMS muon system is covered by Cathode Strip Chambers (CSC) only and lacks redundant coverage despite the fact that it is a challenging region for muons in terms of backgrounds and momentum resolution. In order to maintain good efficiency for the muon trigger in this region additional RPCs are planned to be installed in the two outermost stations at low angle named RE3/1 and RE4/1. These stations will use RPCs with finer granularity and good timing resolution to mitigate background effects and to increase the redundancy of the system.

  11. Active fibre optic splitter for the CMS RPC detector

    Energy Technology Data Exchange (ETDEWEB)

    Banzuzi, Kukka [Helsinki Institute of Physics, University of Helsinki, P.O. Box 64, Gustaf Haellstroemin katu 2, FIN-00014 (Finland)]. E-mail: Kukka.Banzuzi@oxinst.fi; Iskanius, Matti [Lappeenranta University of Technology, P.O, Box 20, Lapprenranta, FIN-53851 (Finland); Karjalainen, Ahti [Lappeenranta University of Technology, P.O, Box 20, Lapprenranta, FIN-53851 (Finland); Tuuva, Tuure [Lappeenranta University of Technology, P.O, Box 20, Lapprenranta, FIN-53851 (Finland)

    2006-09-15

    An electronics module has been designed and tested for the CMS RPC detector readout. The module consists of twelve sub-blocks, each of which receives an optical signal at 1.6 GHz, converts it into electronic form for the splitting process and sends it forth to two or four destinations in optical form. It is a critical part in the trigger system of the experiment. Details of the design are presented, as well as test results confirming that the splitter fulfils all system requirements.

  12. Gas Analysis and Monitoring Systems for the RPC Detector of CMS at LHC

    CERN Document Server

    Abbrescia, M; Guida, R; Iaselli, G; Liuzzi, R; Loddo, F; Maggi, M; Marangelli, B; Natali, S; Nuzzo, S; Pugliese, G; Ranieri, A; Romano, F; Trentadue, R; Benussi, L; Bertani, M; Bianco, S; Caponero, M A; Colonna, D; Donisi, D; Fabbri, F L; Felli, F; Ortenzi, M G B; Pallotta, M; Paolozzi, A; Passamonti, L; Ponzio, B; Pucci, C; Polese, G S G; Segoni, I; Cavallo, N; Fabozzi, F; Paolucci, P; Piccolo, D; Belli, C S G; Grelli, A; Necchi, M; Ratti, S P; Riccardi, C; Torre, P; Vitulo, P

    2006-01-01

    The Resistive Plate Chambers (RPC) detector of the CMS experiment at the LHC proton collider (CERN, Switzerland) will employ an online gas analysis and monitoring system of the freon-based gas mixture used. We give an overview of the CMS RPC gas system, describe the project parameters and first results on gas-chromatograph analysis. Finally, we report on preliminary results for a set of monitor RPC.

  13. Radiation Tests of Real-Sized Prototype RPCs for the Future CMS RPC Upscope

    CERN Document Server

    Lee, K.S.; Choi, S.Y.; Hong, B.; Go, Y.; Kang, M.H.; Lim, J.H.; Park, S.K.; Cimmino, A.; Crucy, S.; Fagot, A.; Gul, M.; Rios, A.A.O.; Tytgat, M.; Zaganidis, N.; Aly, S.; Assran, Y.; Radi, A.; Sayed, A.; Singh, G.; Abbrescia, M.; Iaselli, G.; Maggi, M.; Pugliese, G.; Verwilligen, P.; Doninck, W.van; Colafranceschi, S.; Sharma, A.; Benussi, L.; Bianco, S.; Piccolo, D.; Primavera, F.; Bhatnagar, V.; Kumarl, R.; Metha, A.; Singh, J.; Ahmad, A.; Ahmad, M.; Ahmed, W.; Asghar, M.I.; Awan, I.M.; Hassan, Q.; Hoorani, H.; Khan, W.A.; Khurshid, T.; Muhammad, S.; Shah, M.A.; Shahzad, H.; Kim, M.S.; Goutzvitz, M.; Grenier, G.; Lagarde, F.; Laktineh, I.B.; Carpinteyro Bernardino, S.; Uribe Estrada, C.; Pedraza, I.; Severiano, C.B.; Carrillo Moreno, S.; Vazquez Valencia, F.; Pant, L.M.; Buontempo, S.; Cavallo, N.; Esposito, M.; Fabozzi, F.; Lanza, G.; Lista, L.; Meola, S.; Merola, M.; Orso, I.; Paolucci, P.; Thyssen, F.; Braghieri, A.; Magnani, A.; Montagna, P.; Riccardi, C.; Salvini, P.; Vai, I.; Vitulo, P.; Ban, Y.; Qian, S.J.; Choi, M.; Choi, Y.; Goh, J.; Kim, D.; Aleksandrov, A.; Hadjiiska, R.; Iaydjiev, P.; Rodozov, M.; Stoykova, S.; Sultanov, G.; Vutova, M.; Dimitrov, A.; Litov, L.; Pavlov, B.; Petkov, P.; Lomidze, D.; Avila, C.; Cabrera, A.; Sanabria, J.C.; Crotty, I.; Vaitkus, J.

    2016-01-01

    We report on a systematic study of double-gap and four-gap phenolic resistive plate chambers (RPCs) for future high-{\\eta} RPC triggers in the CMS. In the present study, we constructed real-sized double-gap and four-gap RPCs with gap thicknesses of 1.6 and 0.8 mm, respectively, with 2-mm-thick phenolic high-pressure-laminated (HPL) plates. We examined the prototype RPCs for cosmic rays and 100 GeV muons provided by the SPS H4 beam line at CERN. We applied maximum gamma rates of 1.5 kHz cm-2 provided by 137Cs sources at Korea University and the GIF++ irradiation facility installed at the SPS H4 beam line to examine the rate capabilities of the prototype RPCs. In contrast to the case of the four-gap RPCs, we found the relatively high threshold was conducive to effectively suppressing the rapid increase of strip cluster sizes of muon hits with high voltage, especially when measuring the narrow-pitch strips. The gamma-induced currents drawn in the four-gap RPC were about one-fourth of those drawn in the double-ga...

  14. Charge Distribution Dependency on Gap Thickness of CMS Endcap RPC

    CERN Document Server

    Park, Sung K; Lee, Kyongsei

    2016-01-01

    We report a systematic study of charge distribution dependency of CMS Resistive Plate Chamber (RPC) on gap thickness. Prototypes of double-gap RPCs with six different gap thickness ranging from from 1.0 to 2.0 mm in 0.2-mm steps have been built with 2-mm-thick phenolic high-pressure-laminated plates. The efficiencies of the six gaps are measured as a function of the effective high voltages. We report that the strength of the electric fields of the gap is decreased as the gap thickness is increased. The distributions of charges in six gaps are measured. The space charge effect is seen in the charge distribution at the higher voltages. The logistic function is used to fit the charge distribution data. Smaller charges can be produced within smaller gas gap. But the digitization threshold should be also lowered to utilize these smaller charges.

  15. First installation of DT and RPC packages into the CMS iron yoke

    CERN Multimedia

    Jesus Puerta-Pelayo

    2004-01-01

    These pictures illustrate the installation process of muon barrel packages (DT + RPC) into the pockets of the CMS iron yoke at SX5. The chambers are first transported in groups of four from the ISR area (where they are certified and coupled together) to the construction hall in Cessy (neighbouring France), called Point 5 (or SX5). Once there, they pass through a fast high voltage and electronic certification test, before being slid into the insertion cradle. This cradle is attached to the yoke and aligned to the chamber rails, allowing an easy insertion. A rate of 3 chambers per day can be achieved. This set of pictures was taken during the first final insertion round at Point 5, where most chambers for the lower part of YB+2 were installed.

  16. An Investigation of the dependence of CMS RPC operation on environmental parameters

    Energy Technology Data Exchange (ETDEWEB)

    Assran, Y. [Faculty of Petroleum and Mining Eng., Suez Canal University (Egypt); Colafranceschi, S. [INFN Laboratori Nazionali di Frascati, Via E. Fermi 40, I-00044 Frascati (Italy); Doninck, W.A. [Vrije Universiteit Brussel, B-1050 Brussels (Belgium); Sharma, A. [CERN, CH-1211, Geneva (Switzerland); Wickramage, N., E-mail: nwickram@cern.ch [EHEP, Tata Institute of Fundamental Research, Mumbai (India)

    2011-06-15

    In this paper an analysis is presented on performance of RPC chambers installed in the cosmic ray test stand at ISR, CERN. The currents of RPC chambers are studied as a function of environmental parameters such as temperature, humidity and pressure, which are important for the operation of the RPC detector system at CMS. A 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.

  17. The CMS RPC detector performance during Run-2 data taking

    CERN Document Server

    Shah, Mehar Ali

    2017-01-01

    The CMS experiment, located at the CERN Large Hadron Collider, has a redundant muon system composed by three different detector technologies Cathode Strip Chambers (in the forward regions), Drift Tubes (in the central region), and Resistive Plate Chambers (both in the central and forward regions). The RPCs are designed mainly as a trigger detector but they contribute also to the muon reconstruction. Thus the monitoring and the analysis of the system performance are necessary and essential for the final data quality. The main detector characteristics and the hit efficiency and cluster size will be presented in the paper. The stability of the system in the conditions of high instantaneous luminosity and high number of PU events will be presented in a view of history monitoring and stable trend.

  18. MARTA - Muon Auger RPC for the Tank Array

    Energy Technology Data Exchange (ETDEWEB)

    Shellard, R.C.; Maurizio, D. [Centro Brasileiro de Pesquisas Fisicas (CBPF), Rio de Janeiro, RJ (Brazil); Pimenta, M. [LIP, Lisboa (Portugal)

    2013-07-01

    Full text: The Pierre Auger Observatory was built with the goal of making a major contribution to the understanding of Ultra High Energy Cosmic Rays (UHECR), their origin and nature. It is sensitive to energies above roughly 10{sup 18} eV and it is fully efficient above 3 X 10{sup 18} eV. It has collected data with an exposure of over 31000 km{sup 2} .sr.year, since 2008. However, it has a poor discrimination capability to separate the electromagnetic and the muonic component of an air shower. A good separation capability is an important tool to improve the identification of the primary composition of cosmic rays. MARTA is a proposed detector to address this issue. It based on a well known technology of RPC's (Resistive Plate Chambers). We will present the physics requirements of Auger, for a muon detector, that leads to a better understanding of the structure of air showers and describe how MARTA comply with them. This will allow to: Measure the energy evolution of the distribution of the number of muons in the showers; Disentangle mass composition changes from a change in hadronic interactions at high energies; Improve the energy measurement by subtracting the muon component from the tank signal; Increase the primary photon discrimination power; Improve the estimation of the missing energy in air showers. We describe the detector, its capabilities, and the prototypes with are already installed in the Observatory. We discuss the problems which may arise in running these type of detectors under the harsh conditions of the pampas and the solutions that are proposed to face them. (author)

  19. Studio delle prestazioni dei rivelatori ad RPC per il trigger dell’esperimento CMS

    CERN Document Server

    Cavallo, E; Iaselli, G

    2005-01-01

    Final results on exposition of RPC final chambers and prototype are expounded. Partilcular study on different SF6 percentages present in RPC gas mixture are shown with de development on streamer probability in function of high voltage and signal charge. Performance of final chamers built for CMS experiment have been studied in detail.

  20. Muon Trigger Algorithms Based on 6 RPC Planes

    CERN Document Server

    Kalinowski, Artur; Wrochna, Grzegorz; Zych, Pawel

    2001-01-01

    Various options of reducing the fake trigger rate due to the RPC noise are studied. Improved trigger algorithms using all existing RPC planes are considered. The iideal 4/6i algorithm gives significant reduction of accidental trigger rate, but does not provide a sufficient safety margin for RPC noise > 20 Hz/cm2.

  1. The CMS RPC gas gain monitoring system: an overview and preliminary results

    CERN Document Server

    Benussi, L; Colafranceschi, S; Colonna, D; Daniello, L; Fabbri, F L; Giardoni, M; Ortenzi, B; Paolozzi, A; Passamonti, L; Pierluigi, D; Ponzio, B; Pucci, C; Russo, A; Roselli, G; Colaleo, A; Loddo, F; Maggi, M; Ranieri, A; Abbrescia, M; Iaselli, G; Marangelli, B; Natali, S; Nuzzo, S; Pugliese, G; Romano, F; Trentadue, R; Tupputi, S; Guida, R; Polese, G; Cavallo, N; Cimmino, A; Lomidze, D; Noli, P; Paolucci, D; Piccolo, P; Sciacca, C; Baesso, P; Necchi, M; Pagano, D; Ratti, S P; Vitulo, P; Viviani, C

    2009-01-01

    The status of the CMS RPC Gas Gain Monitoring (GGM) system developed at the Frascati Laboratory of INFN (Istituto Nazionale di Fisica Nucleare) is reported on. The GGM system is a cosmic ray telescope based on small RPC detectors operated with the same gas mixture used by the CMS RPC system. The GGM gain and efficiency are continuously monitored on-line, thus providing a fast and accurate determination of any shift in working point conditions. The construction details and the first result of GGM commissioning are described.

  2. Aging study for resistive plate chambers of the CMS muon trigger detector

    CERN Document Server

    Abbrescia, M; Iaselli, G; Loddo, F; Maggi, M; Marangelli, B; Natali, S; Nuzzo, S; Pugliese, G; Ranieri, A; Romano, F; Altieri, S; Belli, G; Bruno, G; Guida, R; Ratti, S P; Riccardi, C; Torre, P; Vitulo, P

    2003-01-01

    A long-term aging test of a Resistive Plate Chamber (RPC) was carried out with an intense gamma **1**3**7Cs source. The detector was operated in avalanche mode and had the bakelite surface treated with linseed oil. After the irradiation the estimated dose, charge and fluence were approximately equal to the expected values after 10 years of operation in the CMS barrel region. During and after the irradiation, the RPC performance was monitored with cosmic muons and showed no relevant aging effects. Moreover, no variation of the bakelite resistance was observed.

  3. 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.

  4. Assembly and tests of Resistive Plate Chambers (RPC) for the CMS barrel detector

    CERN Multimedia

    Gabriella Pugliese, Bari

    2006-01-01

    The pictures 1-3 show some assembly steps of Resistive Plate Chambers in Bari and their tests with cosmic rays (4-6: moving RPC to the test towers; 7-8 cosmic tests). Pictures 9-10 show assembly and tests in Sofia, 11 shows RPC coupling with drift tubes at ISR and 12-13 tests at the CMS site at CERN.

  5. Upgrade of the CMS Global Muon Trigger

    CERN Document Server

    Jeitler, Manfred; Rabady, Dinyar; Sakulin, Hannes; Stahl, Achim

    2015-01-01

    The increase in center-of-mass energy and luminosity for Run-II of the Large Hadron Collider poses new challenges for the trigger systems of the experiments. To keep triggering with a similar performance as in Run-I, the CMS muon trigger is currently being upgraded. The new algorithms will provide higher resolution, especially for the muon transverse momentum and will make use of isolation criteria that combine calorimeter with muon information already in the level-1 trigger. The demands of the new algorithms can only be met by upgrading the level-1 trigger system to new powerful FPGAs with high bandwidth I/O. The processing boards will be based on the new μTCA standard. We report on the planned algorithms for the upgraded Global Muon Trigger (μGMT) which sorts and removes duplicates from boundaries of the muon trigger sub-systems. Furthermore, it determines how isolated the muon candidates are based on calorimetric energy deposits. The μGMT will be implemented using a processing board that features a larg...

  6. Radiation monitoring of the GEM muon detectors at CMS

    Science.gov (United States)

    Dimitrov, L.; Iaydjiev, P.; Mitev, G.; Vankov, I.

    2016-09-01

    The higher energy and luminosity of future High Luminosity (HL) LHC, determines a significant increasing of the radiation background around the CMS subdetectors, and especially in the higher pseudorapidity region. Under such heavy conditions, the RPC (used in muon trigger) most probably could not operate effectively. GEM (Gas Electron Multiplier) detectors have been identified as a suitable technology to operate in the high radiation environment in that region and test at CMS will start in 2016. A monitoring system to control the absorbed radiation dose by the GEM under test is developed. Two types of sensors are used in it: RadFETs for total absorbed dose and p-i-n diodes for particle (proton and neutron) detection. The basic detector unit, called RADMON, contains two sensors of each type and can be installed at each GEM detector. The system has a modular structure, permitting to increase easily the number of controlled RADMONs: one module controls up to 12 RADMONs, organized in three group of four and communicates outside by RS 485 and CANBUS interfaces.

  7. Upgrade of the CMS Global Muon Trigger

    CERN Document Server

    Lingemann, Joschka; Sakulin, Hannes; Jeitler, Manfred; Stahl, Achim

    2015-01-01

    The increase in center-of-mass energy and luminosity for Run 2 of the Large Hadron Collider pose new challenges for the trigger systems of the experiments. To keep triggering with a similar performance as in Run 1, the CMS muon trigger is currently being upgraded. The new algorithms will provide higher resolution, especially for the muon transverse momentum and will make use of isolation criteria that combine calorimeter with muon information already in the level-1 trigger. The demands of the new algorithms can only be met by upgrading the level-1 trigger system to new powerful FPGAs with high bandwidth I/O. The processing boards will be based on the new microTCA standard. We report on the planned algorithms for the upgraded Global Muon Trigger (GMT) which combines information from the muon trigger sub-systems and assigns the isolation variable. The upgraded GMT will be implemented using a Master Processor 7 card, built by Imperial College, that features a large Xilinx Virtex 7 FPGA. Up to 72 optical links at...

  8. Algorithm and implementation of muon trigger and data transmission system for barrel-endcap overlap region of the CMS detector

    CERN Document Server

    Zabolotny, Wojciech

    2015-01-01

    The CMS experiment is currently undergoing upgrade of its trigger, including the Level-1 muon trigger. In the barrel-endcap transition region it is necessary to merge data from 3 types of detectors - RPC, DT and CSC. The Overlap Muon Track Finder (OMTF) uses the novelty approach to concentrate and process those data in an uniform manner. The paper presents the algorithm and FPGA firmware implementation of the OMTF and its data transmission system in CMS. The OMTF is subject to significant changes during optimizations based on physical simulations. Therefore a special, high level, parametrized HDL implementation is necessary.

  9. First measurements of the performance of the Barrel RPC system in CMS

    Energy Technology Data Exchange (ETDEWEB)

    Colaleo, A.; Loddo, F. [INFN Sezione di Bari (Italy); Maggi, M. [INFN Sezione di Bari (Italy)], E-mail: Marcello.Maggi@ba.infn.it; Ranieri, A. [INFN Sezione di Bari (Italy); Abbrescia, M.; Iaselli, G.; Marangelli, B.; Natali, S.; Nuzzo, S. [Dipartimento Interateneo di Fisica and Sezione INFN, Bari (Italy); Pugliese, G. [Dipartimento Interateneo di Fisica and Sezione INFN, Bari (Italy)], E-mail: Gabriella.Pugliese@ba.infn.it; Romano, F.; Roselli, G.; Trentadue, R.; Tupputi, S. [Dipartimento Interateneo di Fisica and Sezione INFN, Bari (Italy); Baesso, P.; Grelli, A.; Necchi, M.; Pagano, D.; Ratti, S.P.; Vitulo, P. [Dipartimento di Fisica Nucleare e Teorica and Sezione INFN, Pavia (Italy)] (and others)

    2009-10-11

    During the summer 2006, a first integrated test of a part of the CMS experiment was performed at CERN collecting a data sample of several millions of cosmic rays events. A fraction of the Resistive Plate Chambers system was successfully operated. Results on the RPC performance are reported.

  10. 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.

  11. Uniformity and Stability of the CMS RPC Detector at the LHC

    CERN Document Server

    Costantini, S; Cimmino, A.; Garcia, G.; Lellouch, J.; Marinov, A.; Ocampo, A.; Strobbe, N.; Thyssen, F.; Tytgat, M.; Verwilligen, P.; Yazgan, E.; Zaganidis, N.; Dimitrov, A.; Hadjiiska, R.; Litov, L.; Pavlov, B.; Petkov, P.; Aleksandrov, A.; Genchev, V.; Iaydjiev, P.; Rodozov, M.; Shopova, M.; Sultanov, G.; Ban, Y.; Cai, J.; Ge, Y.; Li, Q.; Qian, S.; Xue, Z.; Avila, C.; Chaparro, L.F.; Gomez, J.P.; Gomez Moreno, B.; Osorio Oliveros, A.F.; Sanabria, J.C.; Assran, Y.; Sharma, A.; Abbrescia, M.; Calabria, C.; Colaleo, A.; Loddo, F.; Maggi, M.; Pugliese, G.; Benussi, L.; Bianco, S.; Colafranceschi, S.; Piccolo, D.; Buontempo, S.; Carrillo, C.; Iorio, O.; Paolucci, P.; Berzano, U.; Gabusi, M.; Vitulo, P.; Kang, M.; Lee, K.S.; Park, S.K.; Shin, S.; Choi, Y.; Goh, J.; Kim, M.S.; Seo, H.

    2013-01-01

    The Resistive Plate Chambers (RPCs) are employed in the CMS experiment at the LHC as dedicated trigger system both in the barrel and in the endcap. This note presents results of the RPC detector uniformity and stability during the 2011 data taking period, and preliminary results obtained with 2012 data. The detector uniformity has been ensured with a dedicated High Voltage scan with LHC collisions, in order to determine the optimal operating working voltage of each individual RPC chamber installed in CMS. Emphasis is given on the procedures and results of the High Voltage calibration. Moreover, an increased detector stability has been obtained by automatically taking into account temperature and atmospheric pressure variations in the CMS cavern.

  12. 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.

  13. Status and future prospects of the Muon Drift Tubes system of CMS

    CERN Document Server

    Masetti, Gianni

    2016-01-01

    A key component of the CMS (Compact Muon Solenoid) experiment is its muon system. The tracking and triggering of muons in the central part relies on Drift Tube (DT) chambers. During the first Long Shutdown of LHC (LS1) a number of improvements and upgrades were implemented, in particular concerning the readout and trigger electronics. The increase of luminosity expected by LHC during phase 1 will impose several constraints for rate reduction while maintaining high efficiency in the CMS Level 1 trigger system.In order to exploit the muon detector redundancy, a new trigger system has been designed. The TwinMux system is the early layer of the muon barrel region that combines the primitives information from different subdetectors DT, Resistive Plate Chambers (RPC) and Outer Hadron Calorimeter (HO).Regarding the long term operation of the DT system, in order to cope with up to a factor 2 nominal LHC luminosity, several improvements will be implemented. The in-chamber local electronics will be modified to cope wi...

  14. Status and future prospects of the Muon Drift Tubes System of CMS

    Science.gov (United States)

    Masetti, G.

    2017-01-01

    A key component of the CMS (Compact Muon Solenoid) experiment is its muon system. The tracking and triggering of muons in the central part relies on Drift Tube (DT) chambers. In 2013 and 2014 a number of improvements and upgrades were implemented, in particular concerning the readout and trigger electronics. The increase of luminosity expected by LHC will impose several constraints for rate reduction while maintaining high efficiency in the CMS Level 1 trigger system. In order to exploit the muon detector redundancy, a new trigger system has been designed. The TwinMux system is the early layer of the muon barrel region that combines the primitives information from different subdetectors: DT, Resistive Plate Chambers (RPC) and Outer Hadron Calorimeter (HO). Regarding the long term operation of the DT system, in order to cope with up to a factor 2 nominal LHC luminosity, several improvements will be implemented. The in-chamber local electronics will be modified to cope with the new rate and radiation environment. This paper will present, along with the main system improvements implemented in the system, the first performance results from data collected at 13 TeV center-of-mass energy during 2016, confirming the satisfactory operation of both DT performance and the TwinMux system. A review of the present status and plans for the DT system upgrades will be also described.

  15. The RPC Level-1 Muon Trigger of the ATLAS Experiment at the LHC

    CERN Document Server

    Aloisio, A; Carlino, G; Conventi, F; Di Mattia, A; Izzo, V; Luminari, L; Migliaccio, A; Nisati, A; Pastore, F; Petrolo, E; Salamon, A; Vari, R; Veneziano, Stefano; 14th IEEE - NPSS Real Time Conference 2005 Nuclear Plasma Sciences Society

    2006-01-01

    The initial interactions rate foreseen at LHC at the designed luminosity of 10^34 cm-2 s-1 is 1 GHz. Such an extremely large rate must be reduced by the trigger system to 200 Hz in order to allow permanenent data storage preserving the much less probable physics signals against a large bakground. The ATLAS Level-1 muon trigger will be crucial for the online selection of events with high transverse momentum muons and for its correct association to the bunch-crossing of interest. The overall rejection factor is 10^4. The muon trigger in the barrel region is provided by three layers of Resistive Plate Chmbers (RPC). The logic is based on the search of patterns of hits in the RPC stations consistent with a muon track originated from the interaction vertex. Two pT regimes with different programmable thresholds have been implemented: 3 low-pT trigger thresholds and 3 high-pT one. The associated trigger electronics is based on a custom chip, the Coincidence Matrix (CM), that performs space coincidences and time gate...

  16. Proposal for the RPC muon detector of LHCb

    CERN Document Server

    Adinolfi, M; Calvetti, M; Carboni, G; Iacopini, E; Messi, R; Pacciani, L; Passaleva, G; Santovetti, E; Santovetti, Emanuele

    2000-01-01

    2000-053 We propose to use RPCs to equip a substantial part of the muon detector stations M2-M5. RPCs made of phenolic plates of low resistivity (9 10^9 ohm-cm) and operated in avalanche mode offer very good performance and several advantages in region IV of M2-M5 and in region III of M4-M5. Using this technique it is possible to cover 75 % of the total area behind the calorimeters at moderate cost.

  17. Performance of ATLAS RPC Level-1 Muon trigger during the 2015 data taking

    CERN Document Server

    Corradi, Massimo; The ATLAS collaboration

    2016-01-01

    The Level-1 Muon Barrel Trigger is one of the main elements of the event selection of the ATLAS experiment at the Large Hadron Collider. Its input stage consists of an array of processors receiving the full granularity of data from Resistive Plate Chambers in the central area of the ATLAS detector ("Barrel"). The trigger efficiency and the level of synchronisation of its elements with the rest of ATLAS and the LHC clock are crucial figures of this system: many parameters of the constituent RPC detector and the trigger electronics have to be constantly and carefully checked to assure a correct functioning of the Level-1 selection. Notwithstanding the complexity of such a large array of integrated RPC detectors, the ATLAS Level-1 system has resumed operations successfully after the past 2 year shutdown, with levels similar to those of Run 1. We present the inclusive monitoring of the RPC+L1 system that we have developed to characterise the behaviour of the system, using reconstructed muons in events selected by...

  18. Performance of ATLAS RPC Level-1 muon trigger during the 2015 data taking

    CERN Document Server

    Corradi, Massimo; The ATLAS collaboration

    2016-01-01

    RPCs are used in the ATLAS experiment at the LHC for muon trigger in the barrel region, which corresponds to |eta|<1.05. The status of the barrel trigger system during the 2015 data taking is presented, including measurements of the RPC detector efficiencies and of the trigger performance. The RPC system has been active in more than 99.9% of the ATLAS data taking, showing very good reliability. The RPC detector efficiencies were close to Run-1 and to design value. The trigger efficiency for the high-pT thresholds used in single-muon triggers has been approximately 4% lower than in Run 1, mostly because of chambers disconnected from HV due to gas leaks. Two minor upgrades have been performed in preparation of Run 2 by adding the so-called feet and elevator chambers to increase the system acceptance. The feet chambers have been commissioned during 2015 and are included in the trigger since the last 2015 runs. Part of the elevator chambers are still in commissioning phase and will probably need a replacement ...

  19. Implementation of the data acquisition system for the Overlap Muon Track Finder in the CMS experiment

    Science.gov (United States)

    Zabołotny, W. M.; Bluj, M.; Buńkowski, K.; Byszuk, A. P.; Dobosz, J.; Doroba, K.; Drabik, P.; Górski, M.; Kalinowski, A.; Kierzkowski, K. Z.; Konecki, M.; Okliński, W.; Olszewski, M.; Poźniak, K.; Zawistowski, K.

    2017-01-01

    The Overlap Muon Track Finder (OMTF) is the new system developed during the upgrade of the CMS experiment which includes the upgrade of its Level-1 trigger. It uses the novelty approach to finding muon candidates based on data received from three types of detectors: RPC, DT, and CSC . The upgrade of the trigger system requires also upgrade of the associated Data Acquisition (DAQ) system. The OMTF DAQ transmits the data from the connected detectors that were the basis for the Level-1 trigger decision. To increase its diagnostic potential, it may also transmit the data from a few bunch crossings (BXes) preceding or following the BX, in which the L1 trigger was generated. The paper describes the technical concepts and solutions used in the OMTF DAQ system. The system is still under development. However, it successfully passed the first tests.

  20. The RPC LVL1 trigger system of the muon spectrometer of the ATLAS experiment at LHC

    CERN Document Server

    Aielli, G; Alviggi, M G; Biglietti, M; Bocci, V; Brambilla, Elena; Camarri, P; Canale, V; Caprio, M A; Cardarelli, R; Carlino, G; Cataldi, G; Chiodini, G; Conventi, F; De Asmundis, R; Della Pietra, M; Della Volpe, D; Di Ciaccio, A; Di Mattia, A; Di Simone, A; Falciano, S; Gorini, E; Grancagnolo, F; Iengo, P; Liberti, B; Luminari, L; Nisati, A; Pastore, F; Patricelli, S; Perrino, R; Petrolo, E; Primavera, M; Sekhniaidze, G; Spagnolo, S; Salamon, A; Santonico, R; Vari, R; Veneziano, Stefano

    2004-01-01

    The ATLAS Trigger System has been designed to reduce the LHC interaction rate of about 1 GHz to the foreseen storage rate of about 100 Hz. Three trigger levels are applied in order to fulfill such a requirement. A detailed simulation of the ATLAS experiment including the hardware components and the logic of the Level-1 Muon trigger in the barrel of the muon spectrometer has been performed. This simulation has been used not only to evaluate the performances of the system but also to optimize the trigger logic design. In the barrel of the muon spectrometer the trigger will be given by means of resistive plate chambers (RPCs) working in avalanche mode. Before being mounted on the experiment, accurate quality tests with cosmic rays are carried out on each RPC chamber using the test station facility of the INFN and University laboratory of Napoli. All working parameters are measured and the uniformity of the efficiency on the whole RPC surface is required. A summary of the Napoli cosmic rays tests, together with a...

  1. Performance of the RPC-based ALICE muon trigger system at the LHC

    CERN Document Server

    Bossù, Francesco; Marchisone, Massimiliano

    2012-01-01

    The forward muon spectrometer of ALICE (A Large Ion Collider Experiment) is equipped with a trigger system made of four planes of Resistive Plate Chambers (RPC), arranged in two stations with two planes each, for a total area of about 140 m2 . The system provides single and di-muon triggers with suitable transverse momentum selection, optimised for the physics of quarkonia and open heavy flavour. In the first two years of data-taking at the Large Hadron Collider (2010 and 2011) the 72 RPCs were operated in highly saturated avalanche mode in both pp and Pb-Pb collisions. The integrated charge was about 1.3 mC/cm2 on average and 3.5 mC/cm2 for the most exposed detectors. This paper describes two main results. The first result is the determination of the RPC performance, with particular focus on the stability of the main detector parameters such as efficiency, dark current, and dark rate. The second result is the measurement of the muon trigger performance in Pb-Pb collisions at sqrt(s_NN) = 2.76 TeV, in terms o...

  2. CMS Muon Alignment: System Description and first results

    CERN Document Server

    Sobron, M

    2008-01-01

    The CMS detector has been instrumented with a precise and complex opto-mechanical alignment subsystem that provides a common reference frame between Tracker and Muon detection systems by means of a net of laser beams. The system allows a continuous and accurate monitoring of the muon chambers positions with respect to the Tracker body. Preliminary results of operation during the test of the CMS 4T solenoid magnet, performed in 2006, are presented. These measurements complement the information provided by the use of survey techniques and the results of alignment algorithms based on muon tracks crossing the detector.

  3. CMS muon system towards LHC Run 2 and beyond

    CERN Document Server

    AUTHOR|(CDS)2073611

    2016-01-01

    The CMS muon system has played a key role for many physics results obtained from the LHC Run 1 data. The LHC will increase the beam energy as well as progressively increase the peak instantaneous luminosity in Run 2 and in the following years. Significant consolidation and upgrade activities are ongoing, in order to improve the CMS muon detectors and trigger performance and robustness.With LHC and then HL-LHC running beyond 2030, the large accumulated radiation dose, the high pileup environment, and the ageing of several detector and electronics components become challenges that can only be met with further development and upgrade work.We will introduce the CMS muon system and present the consolidation work in preparation for LHC Run 2. We will then describe the main constraints and the solutions proposed for the upgrade of the muon detector system towards HL-LHC.

  4. CMS muon system towards LHC Run 2 and beyond

    CERN Document Server

    Guiducci, Luigi

    2014-01-01

    The CMS muon system has played a key role for many physics results obtained from the LHC Run 1 data. The LHC will increase the beam energy as well as progressively increase the peak instantaneous luminosity in Run 2 and in the following years. Significant consolidation and upgrade activities are ongoing, in order to improve the CMS muon detectors and trigger performance and robustness.With LHC and then HL-LHC running beyond 2030, the large accumulated radiation dose, the high pileup environment, and the ageing of several detector and electronics components become challenges that can only be met with further development and upgrade work.We will introduce the CMS muon system and present the consolidation work in preparation for LHC Run 2. We will then describe the main constraints and the solutions proposed for the upgrade of the muon detector system towards HL-LHC.

  5. The new Global Muon Trigger of the CMS experiment

    CERN Document Server

    Fulcher, Jonathan Richard; Rabady, Dinyar Sebastian; Reis, Thomas; Sakulin, Hannes

    2016-01-01

    For the 2016 physics data runs the L1 trigger system of the Compact Muon Solenoid (CMS) experiment underwent a major upgrade to cope with the increasing instantaneous luminosity of the CERN LHC whilst maintaining a high event selection efficiency for the CMS physics program. Most subsystem specific trigger processor boards were replaced with powerful general purpose processor boards, conforming to the MicroTCA standard, whose tasks are performed by firmware on an FPGA of the Xilinx Virtex 7 family. Furthermore, the muon trigger system moved from a subsystem centered approach, where each of the three muon detector systems provides muon candidates to the Global Muon Trigger (GMT), to a region based system, where muon track finders (TFs) combine information from the subsystems to generate muon candidates in three detector regions, that are then sent to the upgraded GMT. The upgraded GMT receives up to 108 muons from the processors of the muon TFs in the barrel, overlap, and endcap detector regions. The muons are...

  6. LHC collision event at CMS showing four high energy muons (CMS Higgs search)

    CERN Multimedia

    CMS Collaboration

    2011-01-01

    11sec animation of a Higgs->ZZ->4mu candidate being created CMS . Real CMS proton-proton collision events in which 4 high energy muons (light blue lines) are observed. The event shows characteristics expected from the decay of a Higgs boson but is also consistent with background Standard Model physics processes.

  7. First measurements of cosmic muons with magnetic field in CMS

    Energy Technology Data Exchange (ETDEWEB)

    Biallass, P; Hebbeker, T; Hoepfner, K [Physics Institute IIIA, RWTH Aachen, Physikzentrum, 52056 Aachen (Germany)], E-mail: biallass@cern.ch

    2008-05-15

    The reconstruction of cosmic muons is important for testing and aligning the Compact Muon Solenoid experiment (CMS). In this context the Magnet Test and Cosmic Challenge (MTCC) with its comprehensive cosmic data taking periods including the presence of the 4 Tesla magnetic field has been like a dress rehearsal of detector hardware and software for the upcoming startup of the CMS detector. In addition to data taking also the comparison with simulated events is a crucial part of physics analyses. With respect to these tasks a dedicated cosmic muon generator, CMSCGEN, has been developed and compared with data from MTCC. As an example results from a reconstruction study using the barrel muon system are shown, comparing data and Monte Carlo prediction at the level of single chambers up to reconstructed tracks including momentum measurements.

  8. Performance of CMS Muon Reconstruction in Cosmic-Ray Events

    CERN Document Server

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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 performance of muon reconstruction in CMS is evaluated using a large data sample of cosmic-ray muons recorded in 2008. Efficiencies of various high-level trigger, identification, and reconstruction algorithms have been measured for a broad range of muon momenta, and were found to be in good agreement with expectations from Monte Carlo simulation. The relative momentum resolution for muons crossing the barrel part of the detector is better than 1% at 10 GeV/c and is about 8% at 500 GeV/c, the latter being only a factor of two worse than expected with ideal alignment conditions. Muon charge misassignment ranges from less than 0.01% at 10 GeV/c to about 1% at 500 GeV/c.

  9. Performance of CMS Muon Reconstruction in Cosmic-Ray Events

    CERN Document Server

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    2010-01-01

    The performance of muon reconstruction in CMS is evaluated using a large data sample of cosmic-ray muons recorded in 2008. Efficiencies of various high-level trigger, identification, and reconstruction algorithms have been measured for a broad range of muon momenta, and were found to be in good agreement with expectations from Monte Carlo simulation. The relative momentum resolution for muons crossing the barrel part of the detector is better than 1% at 10 GeV/c and is about 8% at 500 GeV/c, the latter being only a factor of two worse than expected with ideal alignment conditions. Muon charge misassignment ranges from less than 0.01% at 10 GeV/c to about 1% at 500 GeV/c.

  10. Alignment of the CMS Muon System with Cosmic-Ray and Beam-Halo Muons

    CERN Document Server

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    2010-01-01

    The CMS muon system has been aligned using cosmic-ray muons collected in 2008 and beam-halo muons from the 2008 LHC circulating beam tests. After alignment, the resolution of the most sensitive coordinate is 80 microns for the relative positions of superlayers in the same barrel chamber and 270 microns for the relative positions ofendcap chambers in the same ring structure. The resolution on the position of the central barrel chambers relative to the tracker is comprised between two extreme estimates, 200 and 700 microns, provided by two complementary studies. With minor modifications, the alignment procedures can be applied using muons from LHC collisions, leading to additional significant improvements.

  11. Alignment of the CMS Muon System with Cosmic-Ray and Beam-Halo Muons

    CERN Document Server

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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 muon system has been aligned using cosmic-ray muons collected in 2008 and beam-halo muons from the 2008 LHC circulating beam tests. After alignment, the resolution of the most sensitive coordinate is 80 microns for the relative positions of superlayers in the same barrel chamber and 270 microns for the relative positions ofendcap chambers in the same ring structure. The resolution on the position of the central barrel chambers relative to the tracker is comprised between two extreme estimates, 200 and 700 microns, provided by two complementary studies. With minor modifications, the alignment procedures can be applied using muons from LHC collisions, leading to additional significant improvements.

  12. Design and Commissioning of the ATLAS Muon Spectrometer RPC Read Out Driver

    CERN Document Server

    Aloisio, A; Cevenini, F; Della Pietra; Della Volpe; Izzo, V

    2008-01-01

    The RPC subsystem of the ATLAS muon spectrometer provides the Level-1 trigger in the barrel and it is read out by a specific DAQ system. On-detector electronics pack the RPC data in frames, tagged with an event number assigned by the trigger logic, and transmit them to the counting room on optical fibre. Data from each sector are then routed together to a Read-Out Driver (ROD) board. This is a custom processor that parses the frames, checks their coherence and builds a data structure for all the RPCs of one of the 32 sectors of the spectrometer. Each ROD sends the event fragments to a Read-Out subsystem for further event building and analysis. The ROD is a VME64x board, designed around two Xilinx Virtex-II FPGAs and an ARM7 microcontroller. In this paper we describe the board architecture and the event binding algorithm. The boards have been installed in the ATLAS USA15 control room and have been successfully used in the ATLAS commissioning runs.

  13. CMS detects the first muons crossing two barrel sectors

    CERN Multimedia

    Franco Gonella

    2006-01-01

    These are some snapshots from the first cosmic muons crossing sectors 11 and 10 of the CMS barrel wheel YB+2. Five chambers were powered up using the final HV system. With a trigger rate of about 1 Hz, over 26000 events were collected in about 6 hours.

  14. Study of the CMS RPC detector performance in high radiation background conditions

    CERN Document Server

    Miguel Colin, Osvaldo

    2017-01-01

    The RPC system at the CMS Detector is operating successfully from beginning of the data taking. The high instantaneous luminosity causes an extremely high flux of ionizing particles. The long period of operation (Run1 and Run2) in a huge radiation background conditions, gives the opportunity to study the operation capability of the RPCs and also to predict a data-driven extrapolation about the expecting particle rates at HL LHC (High Luminosity) scenario. The obtained results in terms of measured rate, currents and integrated charged will be presented in the poster. When it is possible they will be compared to the relevant results obtained from the dedicated study where a set of test chambers have been irradiated at GIF++ laboratory setup.

  15. Further Tests of the CMS Drift Tubes Muon Trigger

    CERN Document Server

    Aldaya, M; Battilana, Carlo; Bellato, Marco; Benvenuti, Alberto; Bontenackels, Michael; Castellani, Lorenzo; Cavallo, Francesca Romana; Cerminara, Gianluca; Checchia, Paolo; Conti, Enrico; Dallavalle, Gaetano-Marco; de la Cruz, Begona; Deldicque, Christian; Ero, J; Fernández, C; Fernández de Troconiz, J; Fouz-Iglesias, M C; Gasparini, Fabrizio; Giacomelli, Paolo; Giunta, Marina; Gonella, Franco; Guiducci, Luigi; Hebbeker, Thomas; Höpfner, K; Jimenez, Ignacio; Josa-Mutuberria, I; Lacaprara, Stefano; Marcellini, Stefano; Maron, Gaetano; Meneguzzo, Anna Teresa; Monaco, Vincenzo; Montanari, Alessandro; Navarria, Francesco; Odorici, Fabrizio; Parenti, Andrea; Passaseo, Marina; Perrotta, Andrea; Puerta, J; Reithler, Hans; Ronchese, Paolo; Rovelli, Tiziano; Ruetten, P; Sowa, Michael; Staiano, Amedeo; Toniolo, Nicola; Torassa, Ezio; Torromeo, Giovanni; Travaglini, Riccardo; Vanini, Sara; Ventura, Sandro; Villanueva, C; Zanetti, Marco; Zotto, Pierluigi

    2006-01-01

    Two drift tubes stations of the CMS muon barrel system were exposed, in October 2004, to a 40 MHz bunched muon beam at the Cern SpS. The performances of the level-1 local trigger were tested at different energies and inclination angles of the incident muon beam. Data with and without an iron absorber placed between the two stations were also collected, to simulate the electromagnetic shower development in CMS. In addition special data-taking runs were dedicated to test for the first time the level-1 Track Finder trigger system. The present note describes the results of such measurements, focusing the attention on the efficiency and the noise rate of the trigger systems.

  16. Local Trigger Electronics for the CMS Drift Tubes Muon detector

    CERN Document Server

    Travaglini, R

    2003-01-01

    In the CMS detector in preparation for the CERN LHC collider, the Drift Tubes Muon Chambers are equipped with mini-crates hosting custom electronics for fast data processing and local trigger generation. In particular the Trigger Server of a DTC consists of Track Sorter Slave ASICs and a Track Sorter Master system. The trigger electronics boards are in production, to be ready for the muon detector installation in the CMS barrel starting at the end of 2003.In this work, the performance of the Trigger Server will be discussed, on the basis both of high-statistics tests with predefined patterns and of test beam data collected at CERN, where a DTC was exposed to a muon beam having an LHC-like bunch structure. Finally, some system performance expectations, concerning radiation tolerance and signal transmission issues during LHC running, will be also discussed.

  17. A study of materials used for muon chambers at the CMS Experiment at the LHC: interaction with gas, new materials and new technologies for detector upgrade

    CERN Document Server

    Colafranceschi, Stefano

    This thesis lays its foundation in both technological and theoretical stud- ies carried out between several aspects of applied engineering. There are several original contributions within the material science. The first is the detailed studies about the CMS RPC gas filters, which required an intense 3 years data-taking and ended up with a complete characterization of purifier materials. On top of this a stable ad − hoc setup (GGM) has been devel- oped for the CMS Experiment in order to monitor the RPC muon chamber working point. Finally a complete new detector has been designed, build and tested using new technology and new electronics establishing the word’s record in size for this kind of detector, which is taken under consideration for the upgrade of the high-η region of the CMS Experiment.

  18. Alignment of the Muon System at the CMS Experiment

    Science.gov (United States)

    Mueller, Ryan; Perniè, Luca; Pakhotin, Yuriy; Kamon, Teruki; Safonov, Alexei; Brown, Malachi

    2017-01-01

    The muon detectors of the CMS experiment provide fast trigger decisions, muon identifications and muon track measurements. Alignment of the muon detectors is crucial for accurate reconstruction of events with high pT muons that are present in signatures for many new physics scenarios. The muon detector's relative positions and orientations with respect to the inner silicon tracker may be precisely measured using reconstructed tracks propagating from the interaction point. This track-based alignment procedure is capable of aligning individual muon detectors to within 100 microns along sensitive modes. However, weak (insensitive) modes may not be well measured due to the system's design and cause systematic miss-measurements. In this report, we present a new track-based procedure which enables all 6 alignment parameters - 3 positions and 3 rotations for each individual muon detector. The improved algorithm allows for measurement of weak modes and considerably reduced related systematic uncertainties. We describe results of the alignment procedure obtained with 2016 data.

  19. CMS Technical Design Report for the Muon Endcap GEM Upgrade

    CERN Document Server

    AUTHOR|(CDS)2108476; Safonov, A; Sharma, A; Tytgat, M; CERN. Geneva. The LHC experiments Committee; LHCC

    2015-01-01

    This report describes both the technical design and the expected performance of the Phase-II upgrade, using Gas Electron Multiplier (GEM) detectors, of the first endcap station of the CMS muon system. The upgrade is targeted for the second long shutdown of the CERN LHC and is designed to improve the muon trigger and tracking performance at high luminosity. The GEM detectors will add redundancy to the muon system in the 1.6 < |η| < 2.2 pseudorapidity region, where the amount of detection layers is lowest while the background rates are highest and the bending of the muon trajectories due to the CMS magnetic field is small. GEM detectors have been identified as a suitable technology to operate in the high radiation environment present in that region. The first muon endcap station will be instrumented with a double layer of triple-GEM chambers in the 1.6 < |η| < 2.2 region. The detector front-end electronics uses the custom designed VFAT3 chip to provide both fast input for the level-1 muon trigger ...

  20. Electronics for CMS Endcap Muon Level-1 Trigger System Phase-1 and HL LHC upgrades

    Science.gov (United States)

    Madorsky, A.

    2017-07-01

    To accommodate high-luminosity LHC operation at a 13 TeV collision energy, the CMS Endcap Muon Level-1 Trigger system had to be significantly modified. To provide robust track reconstruction, the trigger system must now import all available trigger primitives generated by the Cathode Strip Chambers and by certain other subsystems, such as Resistive Plate Chambers (RPC). In addition to massive input bandwidth, this also required significant increase in logic and memory resources. To satisfy these requirements, a new Sector Processor unit has been designed. It consists of three modules. The Core Logic module houses the large FPGA that contains the track-finding logic and multi-gigabit serial links for data exchange. The Optical module contains optical receivers and transmitters; it communicates with the Core Logic module via a custom backplane section. The Pt Lookup table (PTLUT) module contains 1 GB of low-latency memory that is used to assign the final Pt to reconstructed muon tracks. The μ TCA architecture (adopted by CMS) was used for this design. The talk presents the details of the hardware and firmware design of the production system based on Xilinx Virtex-7 FPGA family. The next round of LHC and CMS upgrades starts in 2019, followed by a major High-Luminosity (HL) LHC upgrade starting in 2024. In the course of these upgrades, new Gas Electron Multiplier (GEM) detectors and more RPC chambers will be added to the Endcap Muon system. In order to keep up with all these changes, a new Advanced Processor unit is being designed. This device will be based on Xilinx UltraScale+ FPGAs. It will be able to accommodate up to 100 serial links with bit rates of up to 25 Gb/s, and provide up to 2.5 times more logic resources than the device used currently. The amount of PTLUT memory will be significantly increased to provide more flexibility for the Pt assignment algorithm. The talk presents preliminary details of the hardware design program.

  1. Visualizing CMS muon drift tubes’ currents

    CERN Document Server

    Hamarik, Lauri

    2015-01-01

    This report documents my work as a summer student in the CMS DT group at CERN in July and August of 2015. During that time, I have participated in relocating DT monitoring experiment to GIF++ site and creating software to analyze drift tubes’ wires current dependence on luminosity and radioactivity.

  2. Aligning the CMS Muon Chambers with the Muon Alignment System during an Extended Cosmic Ray Run

    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; 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    2010-01-01

    The alignment system for the muon spectrometer of the CMS detector comprises three independent subsystems of optical and analog position sensors. It aligns muon chambers with respect to each other and to the central silicon tracker. System commissioning at full magnetic field began in 2008 during an extended cosmic ray run. The system succeeded in tracking muon detector movements of up to 18 mm and rotations of several milliradians under magnetic forces. Depending on coordinate and subsystem, the system achieved chamber alignment precisions of 140-350 microns and 30-200 microradians. Systematic errors on displacements are estimated to be 340-590 microns based on comparisons with independent photogrammetry measurements.

  3. Aligning the CMS Muon Chambers with the Muon Alignment System during an Extended Cosmic Ray Run

    CERN Document Server

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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 alignment system for the muon spectrometer of the CMS detector comprises three independent subsystems of optical and analog position sensors. It aligns muon chambers with respect to each other and to the central silicon tracker. System commissioning at full magnetic field began in 2008 during an extended cosmic ray run. The system succeeded in tracking muon detector movements of up to 18 mm and rotations of several milliradians under magnetic forces. Depending on coordinate and subsystem, the system achieved chamber alignment precisions of 140-350 microns and 30-200 microradians. Systematic errors on displacements are estimated to be 340-590 microns based on comparisons with independent photogrammetry measurements.

  4. Internal interface for RFC muon trigger electronics at CMS experiment

    CERN Document Server

    Pozniak, Krzysztof T; Pietrusinski, Michall

    2004-01-01

    The paper describes design and practical realization of an internal communication layer referred to as the Internal Interface (II). The system was realized for the RFC Muon Trigger of the CMS experiment. Fully automatic implementation of the communication layer is realized in the FPGA chips and in the control software. The methodology of implementation was presented in the description form of the interface structure from the sides of hardware and software. The examples of the communication layer realizations were given for the RFC Muon Trigger.

  5. Testing Of The Muon Port Card And Related Electronics For The Cms Endcap Muon Trigger System

    CERN Document Server

    Pawloski, G J

    2004-01-01

    This thesis is related to the design of the level one endcap muon trigger system for the Compact Muon Solenoid (CMS) experiment at the Large Hadron Collider (LHC). This system is designed to use muon measurements to help reduce a computationally overwhelming 40 MHz signal of collision data (∼40 TBytes/sec) to a manageable 33kHz (∼33GBytes/sec) [1]. The main focus of this thesis will be on the validation of one of the electronics boards in the trigger device chain. This board is used to pick the 3 most interesting muons out of 18 measured in a single crossing. Referred to as the Muon Port Card, this card will be located on the periphery of the detector and can be tested through a VME back plane.

  6. CMS Tracker Commissioning using cosmic muon data

    CERN Document Server

    Borgia, Maria Assunta

    2008-01-01

    Many physics channels, and in particular events containing top quarks, produce b jets in the final state which need to be distinguished from more copious backgrounds containing only light flavored jets. Tagging of b-jets, mainly relies upon relatively distinct properties of b-hadrons such as large proper lifetime, large mass, decays to final states with high charged track multiplicities. Precise spatial reconstruction close to the interaction point and efficient track reconstruction are key ingredients for all b-tagging algorithms. These rely on stable, low noise, low occupancy and highly efficient tracking detectors. This is a short review of the results of the studies on the CMS tracker performances carried out with cosmics at the CERN Tracker Integration Facility from march to july 2007, in order to show how this performance is in line with the requirement of the CMS community for a good b-tagging.

  7. Radiation Testing of Electronics for the CMS Endcap Muon System

    CERN Document Server

    INSPIRE-00070357; Celik, A.; Durkin, L.S.; Gilmore, J.; Haley, J.; Khotilovich, V.; Lakdawala, S.; Liu, J.; Matveev, M.; Padley, B.P.; Roberts, J.; Roe, J.; Safonov, A.; Suarez, I.; Wood, D.; Zawisza, I.

    2013-01-01

    The electronics used in the data readout and triggering system for the Compact Muon Solenoid (CMS) experiment at the Large Hadron Collider (LHC) particle accelerator at CERN are exposed to high radiation levels. This radiation can cause permanent damage to the electronic circuitry, as well as temporary effects such as data corruption induced by Single Event Upsets. Once the High Luminosity LHC (HL-LHC) accelerator upgrades are completed it will have five times higher instantaneous luminosity than LHC, allowing for detection of rare physics processes, new particles and interactions. Tests have been performed to determine the effects of radiation on the electronic components to be used for the Endcap Muon electronics project currently being designed for installation in the CMS experiment in 2013. During these tests the digital components on the test boards were operating with active data readout while being irradiated with 55 MeV protons. In reactor tests, components were exposed to 30 years equivalent levels o...

  8. Aging Study of RPC's for the SiD Hcal and Muon System

    CERN Document Server

    Lu, Changguo; Smith, A J S; Zhang, Jiawen

    2010-01-01

    Preliminary test results on microscope investigation and BESIII-type RPC aging performance have revealed interesting aging phenomena that had not been seen before in Linseed oil coated Italian-type RPC. We report here on the aging performance of BESIII-type and its variant RPC, and on microscopic surface characterization of BESIII-type Bakelite electrodes.

  9. The link-board control in the RPC trigger system for the CMS experiment

    CERN Document Server

    Ungaro, Donatella

    2012-01-01

    The Compact Muon Solenoid (CMS) will be a general-purpose detector designed to runat the highest luminosity at CERN’s Large Hadron Collider (LHC). The CMS detectorhas been optimized for the search of the Higgs Boson over a mass range from 90 GeV to1 TeV, but it also allows detection of a wide range of possible signatures from alternativeelectro-weak symmetry breaking mechanism.The importance of using a powerful Detector Control System (DCS) has much increasedwith the size and complexity of High-Energy detectors.The generation of detectors for the LHC experiments puts further requirements onto thefront-end I/O system due to the inaccessibility of the equipment and the hostileenvironment concerning radiation and magnetic field.All of the CMS components shall be controllable. This control system will not only beused during the data taking periods but also during the test, calibration and standbyperiods and during part of the shutdown periods.The work described in this thesis concerns the Link-Board control (in...

  10. Electronics for CMS Endcap Muon Level-1 Trigger System Phase-1 and HL LHC Upgrades Summary

    CERN Document Server

    Madorsky, Alexander

    2017-01-01

    To accommodate high-luminosity LHC operation at 13 TeV collision energy, the CMS Endcap Muon Level-1 Trigger system had to be significantly modified. To provide the best track reconstruction, the trigger system must now import all available trigger primitives generated by Cathode Strip Chambers and by certain other subsystems, such as Resistive Plate Chambers (RPC). In addition to massive input bandwidth, this also required significant increase in logic and memory resources.To satisfy these requirements, a new Sector Processor unit has been designed. It consists of three modules. The Core Logic module houses the large FPGA that contains the track-finding logic and multi-gigabit serial links for data exchange. The Optical module contains optical receivers and transmitters; it communicates with the Core Logic module via a custom backplane section. The Pt Lookup Table (PTLUT) module contains 1 GB of low-latency memory that is used to assign the final Pt to reconstructed muon tracks. The µTCA architecture (ado...

  11. Offline Data Quality Monitoring for the RPC of the CMS Detector

    CERN Document Server

    Fabela Enriquez, Brenda

    2016-01-01

    Data Quality Monitoring is an important activity that guarantees the proper operation of the detectors in high energy experiments. Besides of the online environment for data quality monitoring there is an offline environment which main goal is the reconstruction and validation of the calibration results, software releases and simulated data. The offline monitoring system of the Resistive Plate Chambers at the Muon Detector of the CMS consists on the data analysis of each run in order to verify that all the subsystems are working correctly, at an efficiency greater than 95pct. This work presents the latest upgrade done to the offline monitoring software based on the restyling of the efficiency code for the 2016 data taking that is about to start. This update allows to do the general analysis in less time in a more complete way and makes the code more flexible to do specific analysis.

  12. Construction and Performance of Large-Area Triple-GEM Prototypes for Future Upgrades of the CMS Forward Muon System

    CERN Document Server

    AUTHOR|(CDS)2068936; Marinov, A.; Zaganidis, N.; Ban, Y.; Cai, J.; Teng, H.; Mohapatra, A.; Moulik, T.; Abbrescia, M.; Colaleo, A.; de Robertis, G.; Loddo, F.; Maggi, M.; Nuzzo, S.; Tupputi, S.A.; Benussi, L.; Bianco, S.; Colafranceschi, S.; Piccolo, D.; Raffone, G.; Saviano, G.; Bagliesi, M.G.; Cecchi, R.; Magazzu, G.; Oliveri, E.; Turini, N.; Fruboes, T.; Abbaneo, D.; Armagnaud, C.; Aspell, P.; Bally, S.; Berzano, U.; Bos, J.; Bunkowski, K.; Chatelain, J.P.; Christiansen, J.; Conde Garcia, A.; David, E.; De Oliveira, R.; Duarte Pinto, S.; Ferry, S.; Formenti, F.; Franconi, L.; Marchioro, A.; Mehta, K.; Merlin, J.; Nemallapudi, M.V.; Postema, H.; Rodrigues, A.; Ropelewski, L.; Sharma, A.; Smilkjovic, N.; Villa, M.; Zientek, M.; Gutierrez, A.; Karchin, P.E.; Gnanvo, K.; Hohlmann, M.; Staib, M.J.

    2011-01-01

    At present, part of the forward RPC muon system of the CMS detector at the CERN LHC remains uninstrumented in the high-\\eta region. An international collaboration is investigating the possibility of covering the 1.6 < |\\eta| < 2.4 region of the muon endcaps with large-area triple-GEM detectors. Given their good spatial resolution, high rate capability, and radiation hardness, these micro-pattern gas detectors are an appealing option for simultaneously enhancing muon tracking and triggering capabilities in a future upgrade of the CMS detector. A general overview of this feasibility study will be presented. The design and construction of small (10\\times10 cm2) and full-size trapezoidal (1\\times0.5 m2) triple-GEM prototypes will be described. During detector assembly, different techniques for stretching the GEM foils were tested. Results from measurements with x-rays and from test beam campaigns at the CERN SPS will be shown for the small and large prototypes. Preliminary simulation studies on the expected...

  13. Muon Studies with the First CMS Data at the LHC; Estudios de Muones con los Primeros Datos de CMS en el LHC

    Energy Technology Data Exchange (ETDEWEB)

    Santiago, C.; Garcia-Abia, P.; Hernandez, J. M.

    2011-05-13

    In this work an analysis of the first data recorded with the CMS detector at the LHC collider is presented. The properties of the detected muons are analyzed and compared with simulated data. The J/Psi ,Psi(2S) and Upsilon(nS) mesons as well as the Z boson have been reconstructed in the muon-anti muon decay channel. These analyses have allowed us to improve the understanding of the CMS detector in terms of muon detection efficiency, resolution and accuracy in the measurement of the momentum and the description of the detector in the simulation. (Author) 17 refs.

  14. Prestaciones del Detector Central de Muones del Experimento CMS: las Camaras de Deriva y su Sistema de Trigger (Performance of the Central Muon Detector of the Experiment CMS: the Drift Tube Chambers and its Trigger System)

    CERN Document Server

    Muñoz, Carlos Villanueva

    2007-01-01

    Prestaciones del Detector Central de Muones del Experimento CMS: las Camaras de Deriva y su Sistema de Trigger (Performance of the Central Muon Detector of the Experiment CMS: the Drift Tube Chambers and its Trigger System)

  15. Work on CMS Muon Detector (CSCs) during Long Shutdown 1

    CERN Multimedia

    Lapka, Marzena

    2015-01-01

    These U.S. physicists made crucial contributions in preparing new electronics in the CMS effort to refurbish the first layer of the muon detector endcap. This effort recently passed a major review, suggesting the project is on track to be part of the experiment when detector operations resumes in early 2015. From left to right: Wells Wulsin (Oklahoma State), Nick Amin (Texas A&M), Indara Suarez (Texas A&M), Shalhout Shalhout (UC Davis), Joe Haley (Northeastern), Michael Gardner (UC Davis), and Justin Pilot (UC Davis). Inset: Joe Golf (left) and Manuel Franco Sevilla, both of UC Santa Barbara.

  16. First results of the cosmic rays test of the RPC of the ATLAS muon spectrometer at LHC

    CERN Document Server

    Alviggi, M G; Caprio, M A; Carlino, G; De Asmundis, R; Della Pietra, M; Della Volpe, D; Iengo, P; Patricelli, S; Sekhniaidze, G

    2004-01-01

    The trigger for the Barrel Muon Spectrometer of the ATLAS experiment at LHC will be given by means of Resistive Plate Chambers working in avalanche mode. Before being mounted on the experimental apparatus each RPC chamber will undergo detailed quality control tests. A dedicated cosmic rays test station with good tracking resolution is operational in Naples University and INFN laboratory. All working parameters of RPCs are monitored and measured. Moreover, the uniformity of the efficiency on the whole surface is measured. A brief description of the test station and results for the first 148 Units will be presented.

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

    CERN Document Server

    INSPIRE-00165402; Khachatryan, V; 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; 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; 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    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.

  18. Study of neutron-induced background hits in the CMS endcap muon system

    CERN Document Server

    Dasgupta, Abhigyan

    2017-01-01

    Among the many challenges arising from the high luminosities of the HL-LHC is the impact of increased hit rates in the cathode strip chambers of the CMS endcap muon system. These chambers detect muons as part of the CMS muon trigger, and their data is used offline for muon track reconstruction. Neutrons (both fast and thermal) induce background hits via nuclear interactions and capture, followed by gamma emission and (mainly) Compton scatter off electrons that subsequently ionize the chamber gas. This note presents recent efforts to improve the understanding of such neutron-induced background through detailed comparison of CMS pp collision data and GEANT4 simulation.

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

    CERN Document Server

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    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.

  20. Testbeam Results of Endcap RPC's

    CERN Document Server

    Ahmed, Ijaz; Hoorani, Hafeez; Aftab, Zia; Jan, J. A; Shariq Khan, M; Solaija, Tariq

    2006-01-01

    In this paper, results are presented from the beamtest in 2002 of the full-scale RE-2/2 prototype RPC chamber assembled in Pakistan. The results are mainly related with the efficiency, time resolution, and rate capability of this non-oiled RPC. The CMS collaboration has imposed strict criteria on the performance parameters for RPC's. These results show that prototype RPC's meet with all the CMS criteria and are suitable for installation in CMS detector.

  1. Upgrade of the global muon trigger at the CMS experiment

    CERN Document Server

    AUTHOR|(INSPIRE)INSPIRE-00282545; Sakulin, Hannes

    2016-09-14

    The Compact Muon Solenoid (CMS) experiment is one of two general purpose detectors at the Large Hadron Collider (LHC) at the particle physics research laboratory in Geneva (CERN). As such it allows a broad array of physics analyses from precision measurements of the standard model of particle physics to searches for exotic new particles. A series of upgrades and maintenance procedures took place in the first shut down from 2013 to 2015. The aim was to prepare the LHC for the collision energy of 13 TeV and further increase its luminosity. During this shut down also upgrades of the CMS experiment were installed.Due to the high rate of collisions at the LHC, it is impossible to record all such events. In order to reduce the event rate to a manageable level, a trigger system is deployed that selects interesting events. At the CMS experiment this system is divided into two levels: A first hardware based system that is optimised for speed and a second that is software based and applies more time consuming and preci...

  2. Calibrating Momentum Measurements Of The CMS Detector Using Cosmic Ray Muons

    Science.gov (United States)

    Zaleski, Shawn

    2017-01-01

    We report results on the muon momentum calibration using cosmic-ray data taken by the Compact Muon Solenoid (CMS) experiment during run 2 at the Large Hadron Collider (LHC). The momentum scale of high-pT muons is sensitive to a possible bias on the curvature coming from the alignment of the muon system. Cosmic rays are a source of high-pT muons that can be used to measure the momentum scale of muons with pT > 200 GeV. The present talk describes the method used to measure the momentum scale from cosmic data and the measurement using the 2016 cosmic data is presented.

  3. High-Rate Fast-Time GRPC for the high eta CMS muon detectors

    CERN Document Server

    Mirabito, Laurent

    2016-01-01

    CMS detector. In their single-gap version we will show that they can stand rates of few ${\\rm kHz/cm}^2$. We also demonstrate that using multi-gap glass RPC, a time resolution of about 60 ps is achieved.

  4. High-Rate Fast-Time GRPC for the high eta CMS muon detectors

    CERN Document Server

    Mirabito, Laurent

    2016-01-01

    CMS detector. In their single-gap version we will show that they can stand rates of few ${\\rm kHz/cm}^2$. We also demonstrate that using multi-gap glass RPC, a time resolution of about 60 ps is achieved.

  5. Impact of the GE1/1 upgrade on CMS muon system performance

    CERN Document Server

    AUTHOR|(CDS)2085297

    2016-01-01

    During the future LHC upgrade planned in 2018, the forward endcap region of the CMS muon spectrometer will be upgraded with GEM chambers. GEM technology is able to withstand the radiation environment expected in the forward region. The GE1/1 station will be included in the muon L1 trigger, allowing to keep low pT threshold even at high luminosity. Moreover, it will bring detection redundancy in the most critical part of the CMS muon system, along with benefits to muon reconstruction performance.

  6. Simulation of the CMS Resistive Plate Chambers

    CERN Document Server

    Hadjiiska, R; Pavlov, B; Petkov, P; Dimitrov, A; Beernaert, K; Cimmino, A; Costantini, S; Garcia, G; Lellouch, J; Marinov, A; Ocampo, A; Strobbe, N; Thyssen, F; Tytgat, M; Verwilligen, P; Yazgan, E; Zaganidis, N; Aleksandrov, A; Genchev, V; Iaydjiev, P; Rodozov, M; Shopova, M; Sultanov, G; Ban, Y; Cai, J; Xue, Z; Ge, Y; Li, Q; Qian, S; Avila, C; Chaparro, L F; Gomez, J P; Moreno, B Gomez; Oliveros, A F Osorio; Sanabria, J C; Assran, Y; Sharma, A; Abbrescia, M; Colaleo, A; Pugliese, G; Loddo, F; Calabria, C; Maggi, M; Benussi, L; Bianco, S; Colafranceschi, S; Piccolo, D; Carrillo, C; Iorio, O; Buontempo, S; Paolucci, P; Vitulo, P; Berzano, U; Gabusi, M; Kang, M; Lee, K S; Park, S K; Shin, S; Kim, M S; Seo, H; Goh, J; Choi, Y; Shoaib, M

    2013-01-01

    The Resistive Plate Chamber (RPC) muon subsystem contributes significantly to the formation of the trigger decision and reconstruction of the muon trajectory parameters. Simulation of the RPC response is a crucial part of the entire CMS Monte Carlo software and directly influences the final physical results. An algorithm based on the parametrization of RPC efficiency, noise, cluster size and timing for every strip has been developed. Experimental data obtained from cosmic and proton-proton collisions at $\\sqrt{s}=7$ TeV have been used for determination of the parameters. A dedicated validation procedure has been developed. A good agreement between the simulated and experimental data has been achieved.

  7. Efficiency of Finding Muon Track Trigger Primitives in CMS Cathode Strip Chambers

    CERN Document Server

    Acosta, Darin; Andreev, Valeri; Apollinari, Giorgio; Baek, Yong Wook; Banicz, Karoly; Barashko, Victor; Barberis, Emanuela; Bartalini, Paolo; Bloch, Ingo; Boeriu, Oana; Bondar, Nikolai; Breedon, Richard; Bujak, Adam; Bylsma, Ben; Chen, Mingshui; Clare, Robert; Cline, David; Cousins, Robert; Cox, Peter Timothy; Denisov, Alexander; Drozdetskiy, Alexey; Durkin, S; Eartly, David P; Ershov, Yuri; Ferguson, Thomas; Fortin, Dominique; Geurts, Frank J M; Gilmore, Jason; Golovtsov, Victor; Golutvin, Igor; Golyash, Alexander; Gu, Jianhui; Gutay, Laszlo; Hauser, Jay; He, Kang-Lin; Holbrook, Britt; Holmes, Daniel; Ignatenko, Mikhail; Ippolito, Nicole; Ivanov, Yasen; Jiang, Chun-Hua; Kao, Shih-Chuan; Karjavin, Vladimir; Khabarov, Serguei; Killewald, Phillip; Ko, Winston; Kotov, Khristian; Korytov, Andrey; Kozhevnikov, Yuri; Lanaro, Armando; Levchenko, Petr; Ling, Ta-Yung; Liu, Jie; Loveless, Richard; Lusin, Sergei; Madorsky, Alexander; Matveev, Mikhail; Medved, Serguei; Mitselmakher, Guenakh; Moisenz, Petr; Padley, Brian Paul; Pakhotin, Yuriy; Pal, Imre; Perelygin, Victor; Petrunin, Anatoly; Pischalnikov, Yuriy; Pivarsky, J; Prokofiev, O; Rakness, Gregory; Roberts, Jay; Roe, Adam; Safonov, Alexei; Schetkovsky, A; Schipunov, L; Schmitt, Michael; Sknar, Vladimir; Stoynev, Stoyan; Sulimov, Valentin; Sun, Han-Sheng; Sytnik, Valeri; Tchekhovski, V; Terentyev, Nikolay; Tripathi, Mani; Tucker, Jordan; Tumanov, Alexander; Uvarov, Lev; Valuev, Vyacheslav; Vasilev, S; Vavilov, Sergey; Velichko, Georgy; Volkov, Serguei; Von der Mey, Martin; Vorobev, I; Vorobyev, Alexey; Vorobyev, Alexey; Wang, Dayong; Williams, Grayson; Yatsura, V; Zarubin, Anatoli; Zhao, Wei-Ren; Zheng, Yangheng; Zhmakin, G; Zhu, Zian; Zilizi, Gyula

    2007-01-01

    In the CMS Experiment, muon detection in the forward direction is accomplished by cathode strip chambers~(CSC). These detectors identify muons, provide a fast muon trigger, and give a precise measurement of the muon trajectory. There are 468 six-plane CSCs in the system. The efficiency of finding muon trigger primitives (muon track segments) was studied using~36 CMS CSCs and cosmic ray muons during the Magnet Test and Cosmic Challenge~(MTCC) exercise conducted by the~CMS experiment in~2006. In contrast to earlier studies that used muon beams to illuminate a very small chamber area ($< \\! 0.01$~m$^2$), results presented in this paper were obtained by many installed CSCs operating {\\em in situ} over an area of $\\approx \\! 23$~m$^2$ as a part of the~CMS experiment. The efficiency of finding 2-dimensional trigger primitives within 6-layer chambers was found to be~$99.93 \\pm 0.03\\%$. These segments, found by the CSC electronics within $800$~ns after the passing of a muon through the chambers, are the input info...

  8. 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.

  9. Di-muon event recorded by the CMS detector (Run 2, 13 TeV)

    CERN Multimedia

    Mc Cauley, Thomas

    2015-01-01

    This image shows a collision event with the largest-mass muon pair so far observed by the CMS detector in proton-collision data collected in 2015. The mass of the di-muon system is 2.4 TeV. One muon, with a transverse momentum of 0.7 TeV, goes through the Drift Tubes in the central region, while the second, with a transverse momentum of 1.0 TeV, hits the Cathode Strip Chambers in the forward region. Both muons satisfy the high-transverse-momentum muon selection criteria.

  10. The performance of the CMS muon detector in proton-proton collisions at $\\sqrt{s}$ = 7 TeV at the LHC

    CERN Document Server

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

    2013-01-01

    The performance of all subsystems of the CMS muon detector has been studied by using a sample of proton--proton collision data at $\\sqrt{s}$ = 7 TeV collected at the LHC in 2010 that corresponds to an integrated luminosity of approximately 40 inverse picobarns. The measured distributions of the major operational parameters of the drift tube (DT), cathode strip chamber (CSC), and resistive plate chamber (RPC) systems met the design specifications. The spatial resolution per chamber was 80-120 micrometers in the DTs, 40-150 micrometers in the CSCs, and 0.8-1.2 centimeters in the RPCs. The time resolution achievable was 3 ns or better per chamber for all 3 systems. The efficiency for reconstructing hits and track segments originating from muons traversing the muon chambers was in the range 95-98%. The CSC and DT systems provided muon track segments for the CMS trigger with over 96% efficiency, and identified the correct triggering bunch crossing in over 99.5% of such events. The measured performance is well repr...

  11. Performances of linseed oil-free bakelite RPC prototypes with cosmic ray muons

    Science.gov (United States)

    Biswas, S.; Bhattacharya, S.; Bose, S.; Chattopadhyay, S.; Saha, S.; Sharan, M. K.; Viyogi, Y. P.

    2009-05-01

    A comparative study has been performed on Resistive Plate Chambers (RPC) made of two different grades of bakelite paper laminates, produced and commercially available in India. The chambers, operated in the streamer mode using argon, tetrafluroethane and isobutane in 34:59:7 mixing ratio, are tested for the efficiency and the stability with cosmic rays. A particular grade of bakelite (P-120, NEMA LI-1989 Grade XXX), used for high voltage insulation in humid conditions, was found to give satisfactory performance with stable efficiency of >96% continuously for more than 130 days. A thin coating of silicone fluid on the inner surfaces of the bakelite RPC is found to be necessary for the operation of the detector.

  12. Construction and test of the final CMS barrel drift tube muon chamber prototype

    CERN Document Server

    Aguilar-Benítez, M; Arneodo, M; Banicz, K; Benettoni, M; Benvenuti, Alberto C; Bethke, Siegfried; Cerrada, M; Cirio, R; Colino, N; Conti, E; Dallavalle, G M; Daniel, M; Dattola, D; Daudo, F; De Giorgi, M; Dosselli, U; Fanfani, A; Fanin, C; Fouz-Iglesias, M C; Gasparini, F; Gasparini, U; Glacomelli, P; Giordano, V; Gonella, F; Grandi, C; Guaita, P; Guerzoni, M; Lacaprara, S; Lippi, I; Marcellini, S; Marin, J; Martinelli, R; Maselli, S; Meneguzzo, Anna Teresa; Migliore, E; Mocholí-Mocholí, J; Monaco, V; Montanari, A; Montnari, C; Odorici, F; Oller, J C; Paoletti, S; Passaseo, M; Pegoraro, M; Peroni, C; Puerta, J; Reithler, H; Romero, A; Romero, L; Ronchese, P; Rossi, A M; Rovelli, T; Sacchi, R; Salicio, J M; Staiano, A; Steinbeck, T M; Torassa, E; Travaglini, R; Ventura, L; Ventura, Sandro; Vitelli, A; Voetee, F; Wegner, M; Willmott, C; Zotto, P L; Zumerle, G

    2002-01-01

    A prototype of the CMS Barrel Muon Detector incorporating all the features of the final chambers was built using the mass production assembly procedures and tools. The performance of this prototype was studied in a muon test beam at CERN and the results obtained are presented in this paper. (12 refs).

  13. Construction and test of the final CMS Barrel Drift Tube Muon Chamber prototype

    Energy Technology Data Exchange (ETDEWEB)

    Aguilar-Benitez, M.; Alberdi, J.; Arneodo, M.; Banicz, K.; Benettoni, M.; Benvenuti, A.; Bethke, S.; Cerrada, M. E-mail: cerrada@ciemat.es; Cirio, R.; Colino, N.; Conti, E.; Dallavalle, M.; Daniel, M.; Dattola, D.; Daudo, F.; De Giorgi, M.; Dosselli, U.; Fanfani, A.; Fanin, C.; Fouz, M.C.; Gasparini, F.; Gasparini, U.; Giacomelli, P.; Giordano, V.; Gonella, F.; Grandi, C.; Guaita, P.; Guerzoni, M.; Lacaprara, S.; Lippi, I.; Marcellini, S.; Marin, J.; Martinelli, R.; Maselli, S.; Meneguzzo, A.; Migliore, E.; Mocholi, J.; Monaco, V.; Montanari, A.; Montanari, C.; Odorici, F.; Oller, J.C.; Paoletti, S.; Passaseo, M.; Pegoraro, M.; Peroni, C.; Puerta, J.; Reithler, H.; Romero, A.; Romero, L.; Ronchese, P.; Rossi, A.M.; Rovelli, T.; Sacchi, R.; Salicio, J.M.; Staiano, A.; Steinbeck, T.; Torassa, E.; Travaglini, R.; Ventura, L.; Ventura, S.; Vitelli, A.; Voetee, F.; Wegner, M.; Willmott, C.; Zotto, P.; Zumerle, G

    2002-03-21

    A prototype of the CMS Barrel Muon Detector incorporating all the features of the final chambers was built using the mass production assembly procedures and tools. The performance of this prototype was studied in a muon test beam at CERN and the results obtained are presented in this paper.

  14. Construction and test of the final CMS Barrel Drift Tube Muon Chamber prototype

    Science.gov (United States)

    Aguilar-Benítez, M.; Alberdi, J.; Arneodo, M.; Banicz, K.; Benettoni, M.; Benvenuti, A.; Bethke, S.; Cerrada, M.; Cirio, R.; Colino, N.; Conti, E.; Dallavalle, M.; Daniel, M.; Dattola, D.; Daudo, F.; De Giorgi, M.; Dosselli, U.; Fanfani, A.; Fanin, C.; Fouz, M. C.; Gasparini, F.; Gasparini, U.; Giacomelli, P.; Giordano, V.; Gonella, F.; Grandi, C.; Guaita, P.; Guerzoni, M.; Lacaprara, S.; Lippi, I.; Marcellini, S.; Marín, J.; Martinelli, R.; Maselli, S.; Meneguzzo, A.; Migliore, E.; Mocholí, J.; Monaco, V.; Montanari, A.; Montanari, C.; Odorici, F.; Oller, J. C.; Paoletti, S.; Passaseo, M.; Pegoraro, M.; Peroni, C.; Puerta, J.; Reithler, H.; Romero, A.; Romero, L.; Ronchese, P.; Rossi, A. M.; Rovelli, T.; Sacchi, R.; Salicio, J. M.; Staiano, A.; Steinbeck, T.; Torassa, E.; Travaglini, R.; Ventura, L.; Ventura, S.; Vitelli, A.; Voetee, F.; Wegner, M.; Willmott, C.; Zotto, P.; Zumerle, G.

    2002-03-01

    A prototype of the CMS Barrel Muon Detector incorporating all the features of the final chambers was built using the mass production assembly procedures and tools. The performance of this prototype was studied in a muon test beam at CERN and the results obtained are presented in this paper.

  15. A Linear Algorithm for the CMS Muon Drift Tubes Local Pattern Recognition

    CERN Document Server

    De Min, Alberto

    2007-01-01

    In this note a new, linear reconstruction algorithm is suggested for the CMS barrel muon chambers that detects the presence of a muon track, performs optimal pattern recognition, solves left-right ambiguities and fits the muon track segment within each chamber with a simple single-step procedure. The algorithm uses mixed-integer programming techniques developed in operations research. Compared to the sequential reconstruction method presently used it is potentially unbiased, more reliable and possibly faster.

  16. MUON DETECTOR

    CERN Multimedia

    F. Gasparini

    Barrel Muons The last CMS week was dominated by the lowering of YB0. The date of lowering was fixed in January for February 28th. RPC and DT cabling of YB0 had to be done on the surface to allow a complete check of the status of the chambers before lowering. When the decision of the date was taken, the wheel cabling, planned to start at end of December, was not yet started for several “muon independent” reasons. Cabling and DT /RPC test started on Jan 22nd and ended on Feb 19th. Several teams worked on the surface of the wheel in parallel on the three different items, finishing just in time for lowering. This was a real challenge and a significant result. So by the end of the CMS Week, all the positive part of CMS plus YB0 were in the cavern. YB+2 had been lowered in January 19th, and YB+1 on February 1st. The vertical chambers of sectors 1 and 7 (8 DT/RPC packs), whose space was taken by the lowering machinery, had to be installed after lowering. This was done from Jan 24 to Jan 26 for...

  17. Overview of large area triple-GEM detectors for the CMS forward muon upgrade

    Science.gov (United States)

    Abbaneo, D.; Abbas, M.; Abbrescia, M.; Abi Akl, M.; Aboamer, O.; Acosta, D.; Ahmad, A.; Ahmed, W.; Aleksandrov, A.; Altieri, P.; Asawatangtrakuldee, C.; Aspell, P.; Assran, Y.; Awan, I.; Bally, S.; Ban, Y.; Banerjee, S.; Barashko, V.; Barria, P.; Bencze, G.; Beni, N.; Benussi, L.; Bhopatkar, V.; Bianco, S.; Bos, J.; Bouhali, O.; Braghieri, A.; Braibant, S.; Buontempo, S.; Calabria, C.; Caponero, M.; Caputo, C.; Cassese, F.; Castaneda, A.; Cauwenbergh, S.; Cavallo, F. R.; Celik, A.; Choi, M.; Choi, S.; Christiansen, J.; Cimmino, A.; Colafranceschi, S.; Colaleo, A.; Garcia, A. Conde; Czellar, S.; Dabrowski, M. M.; De Lentdecker, G.; De Oliveira, R.; de Robertis, G.; Dildick, S.; Dorney, B.; Endroczi, G.; Errico, F.; Fenyvesi, A.; Ferry, S.; Furic, I.; Giacomelli, P.; Gilmore, J.; Golovtsov, V.; Guiducci, L.; Guilloux, F.; Gutierrez, A.; Hadjiiska, R. M.; Hauser, J.; Hoepfner, K.; Hohlmann, M.; Hoorani, H.; Iaydjiev, P.; Jeng, Y. G.; Kamon, T.; Karchin, P.; Korytov, A.; Krutelyov, S.; Kumar, A.; Kim, H.; Lee, J.; Lenzi, T.; Litov, L.; Loddo, F.; Madorsky, A.; Maerschalk, T.; Maggi, M.; Magnani, A.; Mal, P. K.; Mandal, K.; Marchioro, A.; Marinov, A.; Majumdar, N.; Merlin, J. A.; Mitselmakher, G.; Mohanty, A. K.; Mohapatra, A.; Molnar, J.; Muhammad, S.; Mukhopadhyay, S.; Naimuddin, M.; Nuzzo, S.; Oliveri, E.; Pant, L. M.; Paolucci, P.; Park, I.; Passeggio, G.; Pavlov, B.; Philipps, B.; Piccolo, D.; Postema, H.; Puig Baranac, A.; Radi, A.; Radogna, R.; Raffone, G.; Ranieri, A.; Rashevski, G.; Riccardi, C.; Rodozov, M.; Rodrigues, A.; Ropelewski, L.; RoyChowdhury, S.; Ryu, G.; Ryu, M. S.; Safonov, A.; Salva, S.; Saviano, G.; Sharma, A.; Sharma, A.; Sharma, R.; Shah, A. H.; Shopova, M.; Sturdy, J.; Sultanov, G.; Swain, S. K.; Szillasi, Z.; Talvitie, J.; Tatarinov, A.; Tuuva, T.; Tytgat, M.; Vai, I.; Stenis, M. Van; Venditti, R.; Verhagen, E.; Verwilligen, P.; Vitulo, P.; Volkov, S.; Vorobyev, A.; Wang, D.; Wang, M.; Yang, U.; Yang, Y.; Yonamine, R.; Zaganidis, N.; Zenoni, F.; Zhang, A.

    2017-02-01

    In order to cope with the harsh environment expected from the high luminosity LHC, the CMS forward muon system requires an upgrade. The two main challenges expected in this environment are an increase in the trigger rate and increased background radiation leading to a potential degradation of the particle ID performance. Additionally, upgrades to other subdetectors of CMS allow for extended coverage for particle tracking, and adding muon system coverage to this region will further enhance the performance of CMS. Following an extensive R&D program, CMS has identified triple-foil gas electron multiplier (GEM) detectors as a solution for the first muon station in the region 1.6 R&D is ongoing for additional regions.

  18. Development and validation of the Overlap Muon Track Finder for the CMS experiment

    Science.gov (United States)

    Dobosz, J.; Mietki, P.; Zawistowski, K.; Żarnecki, G.

    2016-09-01

    Present article is a description of the authors contribution in upgrade and analysis of performance of the Level-1 Muon Trigger of the CMS experiment. The authors are students of University of Warsaw and Gdansk University of Technology. They are collaborating with the CMS Warsaw Group. This article summarises students' work presented during the Students session during the Workshop XXXVIII-th IEEE-SPIE Joint Symposium Wilga 2016. In the first section the CMS experiment is briefly described and the importance of the trigger system is explained. There is also shown basic difference between old muon trigger strategy and the upgraded one. The second section is devoted to Overlap Muon Track Finder (OMTF). This is one of the crucial components of the Level-1 Muon Trigger. The algorithm of OMTF is described. In the third section there is discussed one of the event selection aspects - cut on the muon transverse momentum pT . Sometimes physical muon with pT bigger than a certain threshold is unnecessarily cut and physical muon with lower pT survives. To improve pT selection modified algorithm was proposed and its performance was studied. One of the features of the OMTF is that one physical muon often results in several muon candidates. The Ghost-Buster algorithm is designed to eliminate surplus candidates. In the fourth section this algorithm and its performance on different data samples are discussed. In the fifth section Local Data Acquisition System (Local DAQ) is briefly described. It supports initial system commissioning. The test done with OMTF Local DAQ are described. In the sixth section there is described development of web application used for the control and monitoring of CMS electronics. The application provides access to graphical user interface for manual control and the connection to the CMS hierarchical Run Control.

  19. Commissioning of the CMS muon detector and development of generic search strategies for new physics

    CERN Document Server

    Biallass, Philipp Alexander

    The detection and reconstruction of cosmic muon rays is important for the commissioning phase and alignment of the Compact Muon Solenoid experiment (CMS), in particular during the early phases of operation with physics collisions. In this context the Magnet Test/Cosmic Challenge (MTCC) with its comprehensive cosmic data taking periods including the presence of the magnetic field has been like a dress rehearsal of detector hardware and software for the upcoming start-up of the CMS detector. In addition to data taking also the comparison with simulated events is a crucial part of physics analyses. The first part of this thesis introduces a new cosmic muon generator, CMSCGEN, and it presents its validation by comparing its predictions with data from MTCC. As an example, results from a reconstruction study using the barrel muon system are shown, comparing data and Monte Carlo prediction at the level of single chambers up to reconstructed tracks including momentum measurements. Since leptons (electrons, muons) con...

  20. Improvement of the CMS Muon Reconstruction Performance due to Precise Track-based Alignment

    Science.gov (United States)

    Brown, Malachi

    2017-01-01

    The performance of the CMS muon system depends on a precise knowledge of the positions and orientations of all its elements. The muon tracks reconstructed in proton-proton collision data at the LHC are used to align the individual muon detectors with respect to the inner silicon tracker. The alignment procedure measures these positions and provides geometries of the muon system that must be validated to ensure the performance of the detectors. In this report we present a set of sophisticated validation tools, developed to test the accuracy of a given muon system geometry with data from collisions. The validation procedure uses events with pairs of muons from Z-boson decays and events with very high pT muons, in order to quantify the reconstruction performance of the muon system for a given geometry. Kinematic properties of muons reconstructed using information from the muon system are compared to the properties of muons built using information from the tracker. We demonstrate improvements of the muon reconstruction performance after track-based alignment procedures are performed with 2016 data.

  1. Efficiency studies of the CMS L3 muon trigger

    CERN Document Server

    De Clerck, Marine

    2016-01-01

    The current muon L3 reconstruction algorithms are tested with various muon HLT paths in order to settle the basis for a comparison with the new L3 reconstruction algorithms. Efficiency and fake rate measurements have been performed for single and double muon paths.

  2. Test beam results from the ATLAS LVL1 muon barrel trigger and RPC readout slice

    CERN Document Server

    Aielli, G; Alviggi, M G; Bocci, V; Brambilla, Elena; Canale, V; Caprio, M A; Cardarelli, R; Cataldi, G; De Asmundis, R; Della Volpe, D; Di Ciaccio, A; Di Simone, A; Distante, L; Gorini, E; Grancagnolo, F; Iengo, P; Nisati, A; Pastore, F; Patricelli, S; Perrino, R; Petrolo, E; Primavera, M; Salamon, A; Santonico, R; Sekhniaidze, G; Severi, M; Spagnolo, S; Vari, R; Veneziano, Stefano

    2004-01-01

    The ATLAS barrel level-1 muon trigger system has the following main requirements: coarse measurement and discrimination of the muon transverse momentum PT; bunch crossing identification; fast and coarse tracking to identify tracks in the precision chambers that are related to the muon candidate; 2nd-coordinate measurement with a required resolution of 5-10 mm. Integration tests have been carried out between the various components of the system and in conjuction with the detector, front-end and other general sub-systems of the experiment. Results from test beam measurements have been performed in the CERN H8 test beam area, where production detectors from one full trigger tower have been installed. (6 refs).

  3. Feasibility of the Hardware Muon Trigger Track Finder Processor in CMS

    CERN Document Server

    Kluge, A

    1999-01-01

    This paper describes a feasibility study for the design of the Muon Trigger Track Finder Processor in the high-energy physics experiment CMS (Compact Muon Solenoid, planned for 2005) at CERN. It covers the specification, proposed method, and a prototype implementation. Comparison between several other measurement methods and the proposed one are carried out. The task of the processor is to identify muons and measure their transverse momenta and locations within 350 ns. It uses data from almost two hundred thousand detector cells of drift tube muon chambers. The processor searches for muon tracks originating from the interaction point by joining the track segments provided by the drift tube muon chamber electronics to full tracks. It assigns transverse momentum to each reconstructed track using the track's bend angle.

  4. First evaluation of neutron induced Single Events Effect on the CMS barrel muon electronics

    CERN Document Server

    Agosteo, S; D'Angelo, G; Favalli, A; Lippi, Ivano; Martinelli, Roberto; Zotto, Pierluigi

    2000-01-01

    Neutron irradiation tests of the currently available electronics for the CMS barrel muon detector were performed using Thermal and fast neutrons at E< 11MeV. The Single Event Upset rate on the Static RAM was measured, while upper limits are derived for events having experienced no failure. The results are used to guess the upper limits on the mean time between failures in the whole barrel muon detector.

  5. Physics motivations and expected performance of the CMS muon system upgrade with triple-GEM detectors

    CERN Document Server

    Venditti, Rosamaria; Abbrescia, Marcello; Aleksandrov, Andrey B; Benussi, Luigi; Beni, Noemi; Bianco, Stefano; Calabria, Cesare; Caponero, Michele; Hernandez, Alfredo Martin Castaneda; Cavallo, Francesca; Colafranceschi, Stefano; Lentdecker, Gilles De; Oliveira, R; Guiducci, Luigi; Hoepfner, Kerstin; Iaydjiev, P S; Korytov, Andrey; Krutelyov, Slava; Kumar, A; Lee, Jason; Litov, L; Loddo, F; Maggi, M; Marchioro, Alessandro; Mitselmakher, Guenakh; Mohanty, Ajit Kumar; Molnar, J; Naimuddin, Md; Nuzzo, S; Pant, Lalit; Paolucci, Pierluigi; Pavlov, Borislav; Piccolo, Davide; Postema, Hans; Raffaella, Radogna; Ranieri, A; Riccardi, C; Rodozov, Mircho; Safonov, Alexei; Saviano, Giovanna; Sharma, Archana; Tytgat, Michael; Vitulo, Paolo; Colaleo, Anna; Caputo, Claudio; Errico, Filippo; Dildick, Sven; Vai, Ilaria; Magnani, Alice; Verwilligen, Piet; Altieri, Palma; Aspell, Paul; Giacomelli, Paolo; Braibant, Sylvie; Buontempo, S; Kamon, Teruki; Tatarinov, A; Celik, Ali; Gilmore, Jason; Flanagan, Will; Khotilovich, Vadim; Czellar, S; Fenyvesi, A; Jozsef Molnar@Cern Ch, Jozsef; Barria, P; Korntheuer, Michael; Lenzi, T; Maerschalk, T; Verhagen, E; Yang, Yifan; Yonamine, R; Zenoni, F; Merlin, J; Dorney, B; Garcia, A Conde; Dabrowski, M; Marinov, A; Oliveri, E; Baranac, A Puig; Ropelewski, Leszek; Bos, J; Bally, S; Stenis, M Van; Ferry, S; Rodrigues, A; Robertis, G De; Christiansen, J; Hohlmann, M; Bhopatkar, V; Mohapatra, A; Zhang, A; Hauser, J; Tuuva, Tuure; Talvitie, J; Passeggio, G; Cassese, F; Banerjee, S; Majumdar, N; Mukhopadhyay, Supratik; Roychowdhur, S; Salva, S; Zaganidis, N; Cimmino, A; Cauwenbergh, S; Bouhali, O; Akl, M Abi; Sturdy, J; Karchin, P; Gutierrez, A; Hadjiiska, R; Aleksandrov, Aleksandar; Rashevski, G; Rodozov, M; Shopova, M; Sultanov, G; Acosta, D; Barashko, V; Furic, I; Madorsky, A; Korytov, A; Mitselmakher, G; Raffone, G; Radi, A; Assran, Y; Aboamer, O; Ahmad, A; Ahmed, W; Awan, I; Hoorani, H; Muhammad, S; Sharma, R; Geonmo, R; Ryu, M S; Park, I; Jeng, Y C; Choi, M; Golovtsov, V; Volkov, S; Vorobyev, A; Choi, S; Guilloux, F; Philipps, B

    2015-01-01

    For the LHC High Luminosity phase (HL-LHC) the CMS GEM Collaboration is planning to in- stall new large size triple-GEM detectors in the forward region of the muon system (1.5< j h |<2.2) of the CMS detector. The muon reconstruction with triple-GEM chambers information included have been successfully integrated in the official CMS software, allowing physics studies to be carried out. The new sub-detector will be able to cope the extreme particle rates expected in this region along with a high spatial resolution. The resulting benefit in terms of triggering and tracking capabilities has been studied: the expected improvement in the performance of the muon identification and track reconstruction as well as the expected improvement coming from the low- ering of the muon p T trigger tresholds will be presented. The contribution will review the status of the CMS upgrade project with the usage of GEM detector, discussing the trigger, the muon reconstruction performance and the impact on the physics analyses.

  6. The status of the GEM project for CMS high-$\\eta$ muon system

    CERN Document Server

    Abbaneo, D; Armagnaud, C; Aspell, P; Assran, Y; Bally, S; Ban, Y; Barria, P; Benussi, L; Berzano, U; Bianco, S; Bos, J; Bunkowski, K; Cai, J; Chatelain, J.P; Christiansen, J; Colafranceschi, S; Colaleo, A; Conde Garcia, A; David, E; De Lentdecker, G; De Oliveira, R; De Robertis, G; Duarte Pinto, S; Ferry, S; Formenti, F; Franconi, L; Fruboes, T; Gutierrez, A; Hohlmann, M; Kamel, A.E; Karchin, P.E; Loddo, F; Maerschalk, T; Magazzù, G; Maggi, M; Marchioro, A; Marinov, A; Mehta, K; Merlin, J; Mohapatra, A; Moulik, T; Nemallapudi, M.V; Nuzzo, S; Oliveri, E; Piccolo, D; Postema, H; Radi, A; Raffone, G; Rodrigues, A; Ropelewski, L; Saviano, G; Sharma, A; Smilkjovic, N; Staib, M.J; Teng, H; Tupputi, S.A; Turini, N; Tytgat, M; Villa, M; Yang, Y; Zaganidis, N; Zenoni, F; Zientek, M

    2013-01-01

    The dedicated CMS R&D program was intended to study the feasibility of using micropattern detectors for the instrumentation of the vacant j η j 4 1 : 6 region in the present Resistive Plate Chambers (RPCs) endcap system. The proposed detector for CMS is a Triple-Gas Electron Multiplier (GEM) trapezoidal chamber, equipped with 1D readout. While during 2010 – 2011 the Collaboration worked on the prototyping of the detector, during the fi rst part of 2012 a newly developed assembly technique to be used for the mass production was adopted. GEMs can provide precision tracking and fast trigger information, contributing on one hand to the improvement of the CMS muon Trigger and on the other hand to provide the missing redundancy in the high η region. In the view of the next LHC long shutdown (LS1) the CMS GEM Collaboration designed and built four full-size Triple GEM-based muon detectors

  7. STATUS REPORT ON THE CMS FORWARD MUON UPGRADE WITH LARGE-SIZE TRIPLE-GEM DETECTORS

    CERN Document Server

    Barria, Patrizia

    2014-01-01

    For the LHC High Luminosity phase (HL-LHC) the CMS GEM Collaboration is planning to install new large size (990 x 440-220 mm2) triple-GEM detectors, equipped with a new readout system, in the forward region of the muon system (1.5 lt IηI lt 2.2) of the CMS detector. Combining triggering and tracking functionalities the new triple-Gas Electron Multiplier (GEM) chambers will not only improve the performance of the CMS muon trigger, but will also improve the muon identification and track reconstruction. With the addition of triple-GEM detectors the forward region of the CMS muon spectrometer will recover its originally planned redundancy. Starting from 2009 the CMS GEM Collaboration built several small and full size prototypes with different geometries, keeping improving the assembly techniques. All these prototypes have been tested in laboratories as well as with beam tests at the CERN SPS and at Fermilab. The results show that the triple-GEM detectors are a mature technology satisfying all the requirements ...

  8. Impact of the GE1/1 station on the performance of the muon system in CMS

    Energy Technology Data Exchange (ETDEWEB)

    Magnani, A., E-mail: alice.magnani@cern.ch

    2016-07-11

    In 2018 a new muon station based on GEM detectors will be installed in the CMS experiment. The present work sums up the main results obtained to evaluate the impact of this upgrade on the muon trigger rate and on muon reconstruction. - Highlights: • In 2018 the forward CMS muon system will be upgraded with GEM detectors. • The detectors have high rate capability to sustain the expected background. • They will allow to reduce muon trigger rates at high luminosity scenarios. • They will provide detection redundancy in case of ageing damages on CSC chambers.

  9. The CMS muon system in Run2: preparation, status and first results

    CERN Document Server

    AUTHOR|(CDS)2072274

    2015-01-01

    The CMS muon system has played a key role for many physics results obtained from the LHC Run-1 data. During the Long Shutdown (2013-2014) significant upgrades have been carried out on the muon detectors and on the L1 muon trigger. In parallel the algorithms for muon reconstruction and identification have been improved for both the High-Level Trigger and the offline reconstruction. Results of studies performed on data and Monte Carlo simulations will be presented, with focus on the improvements aiming to ensure an excellent performance in conditions of multiplicity of pileup events and bunch spacing expected during the high-luminosity phase of Run-2. The early muon performance results from LHC Run-2 will be shown.

  10. Data Acquisition and Management in the Calibration Processes of the CMS Barrel Muon Alignment System

    CERN Document Server

    Székely, Géza; Bencze, Gy L; Béni, N; Imrek, J; Molnár, J; Novák, D; Raics, P; Szabó, Z

    2007-01-01

    In order to be able to match correctly the track elements produced by a muon in the Tracker and the Muon System of the CMS experiment [1] the mutual alignment precision between the Tracker and the Barrel Muon System must be no worse than 100-400 micrometers depending on the radial distance of the muon chambers from the Tracker. To fulfill this requirement an alignment system had to be designed. This system contains subsystems for determining the positions of the barrel and endcap chambers while a third one connects these two to the Tracker. Since the Barrel muon chambers are embedded into the magnet yoke of the experiment a nonconventional alignment method had to be developed. In this paper we restrict ourselves to the Barrel Alignment System and the calibration methods of its components.

  11. First test in a muon beam with two muon DT chambers of CMS

    CERN Multimedia

    Michael Bontenackels

    2004-01-01

    For the first time two muon DT chambers fully equipped with local electronics (minicrates) were operated together in a muon beam in multiple chamber orientations. Also the following multichamber trigger step, the Drift Tube Track Finder (DTTF), was tested. Such relative orientations between both chambers and with respect to the beam allowed simulating different muon momenta for the DTTF.

  12. CMS collision events (7 TeV): candidate ZZ to 4 muons

    CERN Multimedia

    Taylor, L

    2011-01-01

    Real CMS proton-proton collisions events in which 4 high energy muons (red lines) are observed. The event shows characteristics expected from the decay of a Higgs boson but is also consistent with background Standard Model physics processes. Prepared for EPS HEP 2011 Conference.

  13. Quality Control of CMS - GE1/1 Muon Detector Upgrade

    CERN Document Server

    Salem, Safaa

    2016-01-01

    This report summarizes the project I get assigned to as a CERN summer student from 27th of June 2016 to 19th of August 2016. It is mainly focused on Quality Control of CMS GE1/1 muon detector upgrade.

  14. First test of a CMS DT chamber equipped with full electronics in a muon beam

    CERN Multimedia

    Jesus Puerta-Pelayo

    2003-01-01

    A CMS DT chamber of MB3 type, equipped with the final version of a minicrate (containing all on-chamber trigger and readout electronics), was tested in a muon beam for the first time. The beam was bunched in 25 ns spills, allowing an LHC-like response of the chamber trigger. This test confirmed the excellent performance of the trigger design.

  15. Upgrade of the CMS muon trigger system in the barrel region

    CERN Document Server

    AUTHOR|(CDS)2080489; Flouris, Gianis; Fulcher, Jonathan; Loukas, Nikitas; Paradas, Evangelos; Reis,Thomas; Sakulin, Hannes; Wulz, Claudia-Elisabeth

    2016-01-01

    To maintain the excellent performance shown during the LHCs Run-1 the Level-1 Trigger of the Compact Muon Solenoid experiment underwent a significant upgrade. One part of this upgrade is the re-organization of the muon trigger path from a subsystem-centric view in which hits in the drift tubes (DT), the cathode strip chambers (CSC), and the resistive plate chambers (RPC) were treated separately in dedicated track-finding systems to one in which complementary detector systems for a given region (barrel, overlap, and endcap) are merged at the track-finding level. This fundamental restructuring of the muon trigger system required the development of a system to receive track candidates from the track-finding layer, remove potential duplicate tracks, and forward the best candidates to the global decision layer.An overview will be given of the new track-finder system for the barrel region, the Barrel Muon Track Finder (BMTF) as well as the cancel-out and sorting layer, the upgraded Global Muon Trigger ($\\mu$GMT). B...

  16. Design and Test of the Off-Detector Electronics for the CMS Barrel Muon Trigger

    CERN Document Server

    Guiducci, Luigi; Montanari, A; Odorici, F; Pellegrini, G; Torromeo, G; Travaglini, R

    2007-01-01

    Drift Tubes chambers are used in the CMS barrel for tagging the passage of high Pt muons generated in a LHC event and for triggering the CMS data read out. The Sector Collector (SC) system synchronizes the track segments built by trigger modules on the chambers and deliver them to reconstruction processors (Track Finder, TF) that assemble full muon tracks. Then, the Muon Sorter (MS) has to select the best four candidates in the barrel and to filter fake muons generated by the TF system redundancy. The hardware implementations of the Sector Collector and Muon Sorter systems satisfy radiation, I/O and fast timing constraints using several FPGA technologies. The hardware was tested with custom facilities, integrated with other trigger subsystems, and operated in a beam test. A test beam on a 40 MHz bunched beam validated the local trigger electronics and off-detector prototype cards and the synchronization tools. The CMS Magnet Test and Cosmic challenge in 2006 proved stable and reliable operation of the Drift T...

  17. Data Acquisition System for RPC Testing

    CERN Document Server

    Ahmed, Ijaz; Ansari, Muhammad Hamid; Asghar, Muhammad Irfan; Asghar, Sajjad; Awan, Irfan Ullah; Butt, Jamila; Hoorani, Hafeez R; Khurshid, Ishtiaq Hussain Taimoor; Muhammad, Saleh; Shahzad, Hassan; Aftab, Zia; Iftikhar, Mian; Khan, Mohammad Khalid; Saleh, M

    2008-01-01

    The Data Acquisition (DAQ) System of the Compact Muon Solenoid (CMS) RPC test station was built in National Centre for Physics (NCP) during the year 2004-2005 with joint efforts by NCP and PAEC groups. The system is based on the NIM, VME and CAMAC technologies which allowed users to test 10 RPCs simultaneously. With the help of our facility more than 300 RPCs were tested and finally shipped to CERN. This note describes different components of the DAQ in detail and presents a few results from the online DAQ.

  18. Upgrade of the CMS muon trigger system in the barrel region

    Science.gov (United States)

    Rabady, Dinyar; Ero, Janos; Flouris, Giannis; Fulcher, Jonathan; Loukas, Nikitas; Paradas, Evangelos; Reis, Thomas; Sakulin, Hannes; Wulz, Claudia-Elisabeth

    2017-02-01

    To maintain the excellent performance shown during the LHC's Run-1 the Level-1 Trigger of the Compact Muon Solenoid experiment underwent a significant upgrade. One part of this upgrade is the re-organization of the muon trigger path from a subsystem-centric view in which hits in the drift tubes (DT), the cathode strip chambers (CSC), and the resistive plate chambers (RPC) were treated separately in dedicated track-finding systems to one in which complementary detector systems for a given region (barrel, overlap, and endcap) are merged at the track-finding level. This fundamental restructuring of the muon trigger system required the development of a system to receive track candidates from the track-finding layer, remove potential duplicate tracks, and forward the best candidates to the global decision layer. An overview will be given of the new track-finder system for the barrel region, the Barrel Muon Track Finder (BMTF), as well as the cancel-out and sorting layer: the upgraded Global Muon Trigger (μGMT). Both the BMTF and μGMT have been implemented in a Xilinx Virtex-7 card utilizing the microTCA architecture. While the BMTF improves on the proven and well-tested algorithms used in the Drift Tube Track Finder during Run-1, the μGMT is an almost complete re-development due to the re-organization of the underlying systems from track-finders for a specific detector to regional track finders covering a given area of the whole detector. Additionally the μGMT calculates a muon's isolation using energy information received from the calorimeter trigger. This information is added to the muon objects forwarded to the global decision layer, the so-called Global Trigger.

  19. Drift velocity and pressure monitoring of the CMS muon drift chambers

    CERN Document Server

    Sonnenschein, Lars

    2011-01-01

    The drift velocity in drift tubes of the CMS muon chambers is a key parameter for the muon track reconstruction and trigger. It needs to be monitored precisely in order to detect any deviation from its nominal value. A change in absolute pressure, a variation of the gas admixture or a contamination of the chamber gas by air affect the drift velocity. Furthermore, the temperature and magnetic field influence its value. First data, taken with a dedicated Velocity Drift Chamber (VDC) built by RWTH Aachen IIIA are presented. Another important parameter to be monitored is the pressure inside the muon drift tube chambers. The differential pressure must not exceed a certain value and the absolute pressure has to be kept slightly above ambient pressure to prevent air from entering into the muon drift tube chambers in case of a leak. Latest drift velocity monitoring results are discussed.

  20. Drift velocity and pressure monitoring of the CMS muon drift chambers

    CERN Document Server

    Sonnenschein, Lars

    2010-01-01

    The drift velocity in drift tubes of the CMS muon chambers is a key parameter for the muon track reconstruction and trigger. It needs to be monitored precisely in order to detect any deviation from its nominal value. A change in absolute pressure, a variation of the gas admixture or a contamination of the chamber gas by air affect the drift velocity. Furthermore, the temperature and magnetic field influence its value. First data, taken with a dedicated Velocity Drift Chamber (VDC) built by RWTH Aachen IIIA are presented. Another important parameter to be monitored is the pressure inside the muon drift tube chambers because the drift velocity depends on it. Furthermore the differential pressure must not exceed a certain value and the absolute pressure has to be kept slightly above ambient pressure to prevent air from entering into the muon drift tube chambers in case of a leak. Latest pressure monitoring results are discussed.

  1. Analysis of Stability of a gaseous Muon Detector in CMS

    CERN Document Server

    Maheshwari, Bhagesh

    2014-01-01

    The objective of this project is to analyze the stability of the Resistive Plate Chamber (RPCs) gaseous muon detectors based on the current drawn by the detector and eventually spots aging effects after 10 years from the construction of the chambers.

  2. First Test of the Performance of CMS Muon Chambers inside the Barrel Yoke

    CERN Document Server

    Jacobi, Emanuel

    2008-01-01

    The Compact Muon Solenoid (CMS) is a multi purpose experimental particle detector at the Large Hardon Collider (LHC). The goal of this experiment is to do fundamental research in particle physics and in particular to prove the validity of the Higgs model. The CMS muon barrel system provides a precise measurement of the position and the momentum of high energy muons. It consists of 250 drift tube chambers, with rectangular drift cells filled with a gas mixture of 85% Ar and 15%CO$_{2}$. Each chamber is equipped with on-chamber readout and trigger electronics. The chambers for the innermost station have been produced at the Physics Institute IIIA at the RWTH University. After installing the chambers at their final position inside the barrel return yoke for the CMS solenoid magnet, cosmic muons have been recorded individually for all chambers and used to evaluate the detector performance, as this is the last chance to easily access the chambers for hardware interventions. These data also provide a good opportuni...

  3. Compositeness Search with Di-muons in CMS

    CERN Document Server

    Bourilkov, Dimitri

    2006-01-01

    Virtual effects from a generic description of physics beyond the Standard Model in terms of contact interactions will modify the observed cross sections for easy to detect final states like lepton-pairs, and can be used to probe scales much higher than the center-of-mass energy of the partons initiating the interactions. In this contribution the sensitivity reach of the Compact Muon Solenoid experiment at the Large Hadron Collider to contact interactions in the Drell-Yan di-muon channel is investigated. The double-ratio method for studying the steeply falling Drell-Yan mass spectrum is developed and shown to deal successfully, and with reduced systematic uncertainties, with the background normalization in a compositeness search. Experimental aspects of the measurements, systematic error effects and the evolution of the search reach with accumulated luminosity are considered.

  4. Fine Synchronization of the CMS Muon Drift-Tube Local Trigger using Cosmic Rays

    CERN Document Server

    INSPIRE-00165402; Khachatryan, V; 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; 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    2010-01-01

    The CMS experiment uses self-triggering arrays of drift tubes in the barrel muon trigger to perform the identification of the correct bunch crossing. The identification is unique only if the trigger chain is correctly synchronized. In this paper, the synchronization performed during an extended cosmic ray run is described and the results are reported. The random arrival time of cosmic ray muons allowed several synchronization aspects to be studied and a simple method for the fine synchronization of the Drift Tube Local Trigger at LHC to be developed.

  5. Performance of the CMS Level-1 Trigger during Commissioning with Cosmic Ray Muons and LHC beams

    CERN Document Server

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    2010-01-01

    The CMS Level-1 trigger was used to select cosmic ray muons and LHC beam events during data-taking runs in 2008, and to estimate the level of detector noise. This paper describes the trigger components used, the algorithms that were executed, and the trigger synchronisation. Using data from extended cosmic ray runs, the muon, electron/photon, and jet triggers have been validated, and their performance evaluated. Efficiencies were found to be high, resolutions were found to be good, and rates as expected.

  6. Track finding processor in the DTBX based CMS barrel muon trigger

    CERN Document Server

    Kluge, A

    1996-01-01

    We present the design and simulation of the track finding processor in the DTBX ( Drift Tube with Bunch Crossing Identification) based CMS barrel muon trigger system. The processor searches for muon tracks originating from the interaction region by joining the track segments provided by the mean timer processors of the drift chambers to track strings. It assigns transverse momenta to the reconstructed tracks using the tracks' bending angle. High speed is achieved by performing the track reconstruction fully in parallel. In this contribution the algorithms, implementation and simulation results are presented.

  7. Performance of the CMS Level-1 Trigger during Commissioning with Cosmic Ray Muons and LHC beams

    CERN Document Server

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    2010-01-01

    The CMS Level-1 trigger was used to select cosmic ray muons and LHC beam events during data-taking runs in 2008, and to estimate the level of detector noise. This paper describes the trigger components used, the algorithms that were executed, and the trigger synchronisation. Using data from extended cosmic ray runs, the muon, electron/photon, and jet triggers have been validated, and their performance evaluated. Efficiencies were found to be high, resolutions were found to be good, and rates as expected.

  8. Fine Synchronization of the CMS Muon Drift-Tube Local Trigger using Cosmic Rays

    CERN Document Server

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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 experiment uses self-triggering arrays of drift tubes in the barrel muon trigger to perform the identification of the correct bunch crossing. The identification is unique only if the trigger chain is correctly synchronized. In this paper, the synchronization performed during an extended cosmic ray run is described and the results are reported. The random arrival time of cosmic ray muons allowed several synchronization aspects to be studied and a simple method for the fine synchronization of the Drift Tube Local Trigger at LHC to be developed.

  9. Resistive plate chamber online data quality monitoring for the Compact Muon Solenoid at the European Center for Nuclear Research

    CERN Document Server

    Whitaker, William David

    2008-01-01

    A comprehensive, online, data quality monitoring software package has been developed for the muon system at the European Center for Nuclear Research's (CERN's) Compact Muon Solenoid (CMS) experiment. The package was written in Java, C++, and HTML. It provides real-time, RPC performance feedback in an easy to use graphic user interface (GUI).

  10. Performance of the CMS Cathode Strip Chamber endcap muon detectors in Run 2 and first results with 2015 data

    CERN Document Server

    CMS Collaboration

    2015-01-01

    The Cathode Strip Chambers (CSC's) are located in the CMS endcap and record muons in the region of absolute pseudorapidity between 0.9 and 2.4. The first performance results of the CSC's in Run 2 are shown.

  11. Development and performance of Triple-GEM detectors for the Upgrade of the Muon System of the CMS experiment

    CERN Document Server

    AUTHOR|(CDS)2088078

    2015-01-01

    The CMS Collaboration is evaluating GEM detectors for the upgrade of the muon system. This contribution will focus on the R and D performed on chambers design features and will discuss the performance of the upgraded detector.

  12. The drift velocity monitoring system of the CMS barrel muon chambers

    CERN Document Server

    Altenhoefer, Georg Friedrich; Heidemann, Carsten Andreas; Reithler, Hans; Sonnenschein, Lars; Teyssier, Daniel Francois

    2017-01-01

    The drift velocity is a key parameter of drift chambers. Its value depends on several parameters: electric field, pressure, temperature, gas mixture, and contamination, for example, by ambient air. A dedicated Velocity Drift Chamber (VDC) with 1-L volume has been built at the III. Phys. Institute A, RWTH Aachen, in order to monitor the drift velocity of all CMS barrel muon Drift Tube chambers. A system of six VDCs was installed at CMS and has been running since January 2011. We present the VDC monitoring system, its principle of operation, and measurements performed.

  13. A 3-D Track-Finding Processor for the CMS Level-1 Muon Trigger

    CERN Document Server

    Acosta, D; Madorsky, A.; Scurlock, B.; Stoeck, H.; Wang, S.M.; Golovtsov, V.; Uvarov, L.

    2003-01-01

    We report on the design and test results of a prototype processor for the CMS Level-1 trigger that performs 3-D track reconstruction and measurement from data recorded by the cathode strip chambers of the endcap muon system. The tracking algorithms are written in C++ using a class library we developed that facilitates automatic conversion to Verilog. The code is synthesized into firmware for field-programmable gate-arrays from the Xilinx Virtex-II series. A second-generation prototype has been developed and is currently under test. It performs regional track-finding in a 60 degree azimuthal sector and accepts 3 GB/s of input data synchronously with the 40 MHz beam crossing frequency. The latency of the track-finding algorithms is expected to be 250 ns, including geometrical alignment correction of incoming track segments and a final momentum assignment based on the muon trajectory in the non-uniform magnetic field in the CMS endcaps.

  14. Thin Double-gap RPCs for the Phase-2 Upgrade of the CMS Muon System

    CERN Document Server

    Lee, Kyong Sei

    2017-01-01

    High-sensitive double-gap phenolic Resistive Plate Chambers are studied for the Phase-2 upgrade of the CMS muon system at high pseudorapidity $\\eta$. Whereas the present CMS RPCs have a gas gap thickness of 2 mm, we propose to use thinner gas gaps, which will improve the performance of these RPCs. To validate this proposal, we constructed double-gap RPCs with two different gap thicknesses of 1.2 and 1.4 mm using high-pressure laminated plates having a mean resistivity of about 5 $\\times$ 10$^{10}$ $\\Omega$-cm. This paper presents test results using cosmic muons and $^{137}$Cs gamma rays. The rate capabilities of these thin-gap RPCs measured with the gamma source exceed the maximum rate expected in the new high-$\\eta$ endcap RPCs planned for future Phase-2 runs of LHC.

  15. Single event effects measurements on the electronics for the CMS muon barrel detector at LHC

    CERN Document Server

    Agosteo, S; D'Angelo, G; Dal Corso, F; Dallavalle, G M; De Giorgi, M; Fernández, C; Gonella, F; Lippi, I; Marin, J; Martinelli, R; Montanari, A; Odorici, F; Oller, J C; Pegoraro, M

    2002-01-01

    Several irradiation tests of the electronics of the CMS barrel muon detector were performed using neutrons, protons and heavy ions. The Single Event Upset rate on some tested devices was measured, while upper limits were obtained for devices having experienced no failure. Single Event Transients on front-end electronics and destructive effects on the High-voltage distribution electronics were observed. Overcurrent protection and error correction circuits were included in the irradiated boards and were tested.

  16. Design and simulation of the CMS first-level muon trigger track finder

    CERN Document Server

    Wildschek, T

    1998-01-01

    The Large Hadron Collider LHC is scheduled to start operation in the year 2005 at the CERN research center. Experiments at this collider will look for extremely rare physics events hidden in an overwhelming rate of background events. It is the task of the experiment's trigger system to reduce the total event rate to a level that can be recorded permanently for later analysis. The high reduction factor from total rate to recording rate places demands on the experiment's trigger system that go beyond any experienced at previous high-energy physics experiments. The objective of my thesis has been to design a part of that trigger system, the regional first level muon trigger, of one of the LHC experiments, the Compact Muon Solenoid (CMS) detector. At the beginning, I give a brief introduction to the LHC and its physics motivation, followed by an overview of the CMS detector. The emphasis is on the detector's muon system. Next comes a general introduction to triggering, followed by an overview of the CMS trigger s...

  17. Gas Detectors Performance in CMS and Excited Muon Search Feasibility Study at 14 teV

    CERN Document Server

    AUTHOR|(INSPIRE)INSPIRE-00572294; Mahrous, Ayman; Yasein, Mohamed Nabil

    Within the Standard Model(SM) of particle physics, quarks and leptons are understood to be the fundamental particles and Their existence have been verified experimentally. A search for substructure of quarks or study of quark compositeness is carried out with the CMS detector at LHC, using $ 300 fb^{-1} $ of integrated luminosity at a center-of-mass energy$ \\sqrt{s} =14 TeV $. The discovery of excited muons ($ \\mu^{*} $) would be a first indication of lepton compositeness. In the current study, $ \\mu^{*} $ is assumed to be produced via four-fermions contact interactions in association with a muon ($ \\mu $) and to decay via the gauge mediated process $ \\mu^{*} \\to \\mu\\gamma$, yielding a final state with two muons and a photon. Monte Carlo (MC) samples are produced via MadGraph5 and PYTHIA 8 event generators. To simulate the detector response, GEANT4 which interfaced to CMS software was used for full simulation and Delphes was used for fast simulation, assuming the CMS detector configuration. Objects and ev...

  18. Design and simulation of the CMS first-level muon trigger track finder

    CERN Document Server

    Wildschek, T

    1998-01-01

    The Large Hadron Collider LHC is scheduled to start operation in the year 2005 at the CERN research center. Experiments at this collider will look for extremely rare physics events hidden in an overwhelming rate of background events. It is the task of the experiment's trigger system to reduce the total event rate to a level that can be recorded permanently for later analysis. The high reduction factor from total rate to recording rate places demands on the experiment's trigger system that go beyond any experienced at previous high-energy physics experiments. The objective of my thesis has been to design a part of that trigger system, the regional first level muon trigger, of one of the LHC experiments, the Compact Muon Solenoid (CMS) detector. At the beginning, I give a brief introduction to the LHC and its physics motivation, followed by an overview of the CMS detector. The emphasis is on the detector's muon system. Next comes a general introduction to triggering, followed by an overview of the CMS trigger s...

  19. Measurement of the charge ratio of atmospheric muons with the CMS detector

    Energy Technology Data Exchange (ETDEWEB)

    Khachatryan, Vardan [Yerevan Physics Inst. (Armenia); et al.

    2010-08-01

    We present a measurement of the ratio of positive to negative muon fluxes from cosmic ray interactions in the atmosphere, using data collected by the CMS detector both at ground level and in the underground experimental cavern at the CERN LHC. Muons were detected in the momentum range from 5 GeV/c to 1 TeV/c. The surface flux ratio is measured to be 1.2766 \\pm 0.0032(stat.) \\pm 0.0032 (syst.), independent of the muon momentum, below 100 GeV/c. This is the most precise measurement to date. At higher momenta the data are consistent with an increase of the charge ratio, in agreement with cosmic ray shower models and compatible with previous measurements by deep-underground experiments.

  20. Performance of electron, photon and muon triggers at the CMS High Level Trigger

    CERN Document Server

    Fernandez Perez Tomei, Thiago Rafael

    2015-01-01

    The trigger systems of the LHC detectors play a crucial role in determining the physics capabilities of the experiments. A reduction of several orders of magnitude of the event rate is needed to reach values compatible with the detector readout, offline storage and analysis capabilities. The CMS experiment has been designed with a two-level trigger system the Level 1 (L1) Trigger, implemented on custom-designed electronics, and the High Level Trigger (HLT), a streamlined version of the CMS reconstruction and analysis software running on a computer farm. Here we will present the design and performance of the main muon, electron and photon triggers, in view of the more challenging conditions for the LHC Run 2. For the muon case, we discuss the improvements in the isolation algorithm with the usage of Particle Flow techniques, which allow for better discrimination power between processes with prompt muons and the the effect of jets penetrating through the hadronic calorimeter into the muon chambers. For the ele...

  1. MUON DETECTORS: RPC

    CERN Multimedia

    Giuseppe Iaselli

    Major interventions have been completed on the plus-side endcap. Two faulty chambers have been replaced, the gas circuit for six sectors has been modified from serial to parallel, the leaking cooling circuits have been fixed, and a few high voltage connectors have been replaced. The minus-side endcap has been fully commissioned and the link board electronics put into operation. A preliminary attempt to synchronize the minus endcap has also been attempted during the global run data taking. Some additional improvement of the grounding connections has been done on the W+2/W-2 barrel wheels. A preliminary observation of the monitoring data shows this has had a positive effect on the noise level. Significant improvement in our understanding of the CCR ring instabilities has been achieved. Additional filters will be installed on the cables to protect against noise pick-up. The implementation of the TTU technical trigger was completed and the system was debugged. The TTU now has to be integrated into the overal...

  2. Quality control tests for the CMS Barrel RPCs

    Energy Technology Data Exchange (ETDEWEB)

    Abbrescia, M. [Dipartimento Interateneo di Fisica and Sezione INFN, v. G. Amendola 173, 70126 Bari (Italy); Colaleo, A. [Dipartimento Interateneo di Fisica and Sezione INFN, v. G. Amendola 173, 70126 Bari (Italy); Guida, R. [Dipartimento Interateneo di Fisica and Sezione INFN, v. G. Amendola 173, 70126 Bari (Italy); Iaselli, G. [Dipartimento Interateneo di Fisica and Sezione INFN, v. G. Amendola 173, 70126 Bari (Italy); Loddo, F. [Dipartimento Interateneo di Fisica and Sezione INFN, v. G. Amendola 173, 70126 Bari (Italy); Maggi, M. [Dipartimento Interateneo di Fisica and Sezione INFN, v. G. Amendola 173, 70126 Bari (Italy); Marangelli, B. [Dipartimento Interateneo di Fisica and Sezione INFN, v. G. Amendola 173, 70126 Bari (Italy); Natali, S. [Dipartimento Interateneo di Fisica and Sezione INFN, v. G. Amendola 173, 70126 Bari (Italy); Nuzzo, S. [Dipartimento Interateneo di Fisica and Sezione INFN, v. G. Amendola 173, 70126 Bari (Italy); Pugliese, G. [Dipartimento Interateneo di Fisica and Sezione INFN, v. G. Amendola 173, 70126 Bari (Italy)]. E-mail: Gabriella.Pugliese@ba.infn.it; Ranieri, A. [Dipartimento Interateneo di Fisica and Sezione INFN, v. G. Amendola 173, 70126 Bari (Italy); Romano, F. [Dipartimento Interateneo di Fisica and Sezione INFN, v. G. Amendola 173, 70126 Bari (Italy); Trentadue, R. [Dipartimento Interateneo di Fisica and Sezione INFN, v. G. Amendola 173, 70126 Bari (Italy); Cavallo, N.; Fabozzi, F. [Universita degli studi della Basilicata and Sezione INFN, Naples (Italy); Paolucci, P.; Piccolo, D.; Polese, G.; Sciacca, C.; Belli, G.; Necchi, M.; Ratti, S.P.; Riccardi, C.; Torre, P.; Vitulo, P. [Dipartimento di Fisica Nucleare e Teorica and Sezione INFN, v. U. Bassi 6, 27100 Pavia (Italy); Anguelov, T.; Genchev, V.; Panev, B.; Piperov, S.; Sultanov, G.; Vankov, P. [INRNE, BAS, Soa (Bulgaria); Dimitrov, A.; Litov, L.; Pavlov, B.; Petkov, P. [University of Soa St. Kliment Ohridski (Bulgaria)

    2006-08-15

    An RPC based system will be employed for the CMS muon first level trigger. Severe quality controls and certification have been established all along the entire production chain. Procedures are briefly described and results for the acceptance percentage are given for the second part of the single gaps and double gaps production. Summary results are also reported for the full sets of tested chambers.

  3. Supersymmetry Searches at the Compact Muon Solenoid (CMS Experiment, 2011

    Directory of Open Access Journals (Sweden)

    Koay S. A.

    2012-06-01

    Full Text Available The discovery/exclusion of Supersymmetric models for fundamental interactions of particles is one of the milestones targeted by the Large Hadron Collider (LHC, and in particular comprises of a large part of the physics program of the CMS experiment. Since the initial measurements using the 36 pb−1 of integrated luminosity delivered by the LHC in 2010, presently available results utilize about one fifth of the data delivered in 2011, i.e. in the ballpark of 1 fb−1, significantly extending the world limits placed on gluino and squark production signals. An overview of these analyses is presented, highlighting four that had been newly made public as of the date of this conference. The evidence for Supersymmetry (SUSY is still elusive, and a discussion follows as to where current searches have not yet probed, also pointing out where they might have difficulty ever probing without dedicated arrangements.

  4. Supersymmetry Searches at the Compact Muon Solenoid (CMS) Experiment, 2011

    CERN Document Server

    Koay, S A

    2012-01-01

    The discovery/exclusion of Supersymmetric models for fundamental interactions of particles is one of the milestones targeted by the Large Hadron Collider (LHC), and in particular comprises of a large part of the physics program of the CMS experiment. Since the initial measurements using the 36\\ipb of integrated luminosity delivered by the LHC in 2010, presently available results utilize about one fifth of the data delivered in 2011, i.e. in the ballpark of 1\\ifb, significantly extending the world limits placed on gluino and squark production signals. An overview of these analyses is presented, highlighting four that had been newly made public as of the date of this conference. The evidence for Supersymmetry (SUSY) is still elusive, and a discussion follows as to where current searches have not yet probed, also pointing out where they might have difficulty ever probing without dedicated arrangements.

  5. Performance and Mechanical Tolerances Achieved with a Full Size Prototype of a CMS Barrel Muon Drift Tubes Chamber

    CERN Document Server

    Bethke, Siegfried; Benettoni, Massimo; Benvenuti, Alberto; Berdugo, Javier; Cerrada, Marcos; Colino, Nicanor; Conti, Enrico; Dallavalle, Gaetano-Marco; Daniel, Manuel; De Giorgi, Marco; De Min, Alberto; Dosselli, Umberto; Fanin, Claudio; Fouz-Iglesias, M C; Gasparini, Fabrizio; Gasparini, Ugo; Giantin, R; Grandi, Claudio; Guaita, Paola; Guerzoni, Marco; Ladrón de Guevara, Pedro; Lippi, Ivano; Marcellini, Stefano; Martinelli, Roberto; Meneguzzo, Anna Teresa; Mocholí-Mocholí, J; Montanari, Alessandro; Montanari, Christian; Navarria, Francesco; Odorici, Fabrizio; Reithler, Hans; Romero, Luciano; Rossi, Antonio; Rovelli, Tiziano; Schwarthoff, Hubert; Sondermann, Volker; Tano, Valeria; Teykal, Helmut; Tutas, Joerg; Van den Hirtz, J; Wagner, H; Wegner, Martin; Willmott, Carlos

    1998-01-01

    The barrel muon chambers of the CMS experiment are made assembling 3 independent modules ( SuperLayers) which together measure the impact point and the angles theta and phi. Each SuperLayer consists of four layers of rectangular Drift Tubes. MB96 is a full size prototype of the smallest CMS Barrel Muon Chamber ( MB1) built in early 1997 at the Legnaro INFN laboratory and tested in summer 1997 at the CERN CMS test beam facility. The performance of the prototype and the mechanical tolerances achieved in the construction are presented.

  6. Upgrade of the Level-1 muon trigger of the ATLAS detector in the barrel-endcap transition region with RPC chambers

    CERN Document Server

    Massa, L; The ATLAS collaboration

    2014-01-01

    This report presents a project for the upgrade of the Level-1 muon trigger in the barrel-endcap transition region (1.01) caused by charged particles originating from secondary interactions downstream of the interaction point. After the LHC phase-1 upgrade, forseen for 2018, the Level-1 muon trigger rate would saturate the allocated bandwidth unless new measures are adopted to improve the rejection of fake triggers. ATLAS is going to improve the trigger selectivity in the region |$\\eta$|>1.3 with the addition of the New Small Wheel detector as an inner trigger plane. To obtain a similar trigger selectivity in the barrel-endcap transition region 1.0<|$\\eta$|<1.3, it is proposed to add new RPC chambers at the edge of the inner layer of the barrel muon spectrometer. These chambers will be based on a three layer structure with thinner gas gaps and electrodes with respect to the ATLAS standard and a new low-profile light-weight mechanical structure that will allow the installation in the limited available spa...

  7. Performance of the HLT muon reconstruction used in CMS

    CERN Document Server

    Ferreres Sole, Silvia

    2017-01-01

    The Large Hadron Collider (LHC) generates millions of collision per second. These collisions take place inside the detector, which should read out the data and store it for further analysis. However, there is no possible way of storing all the data generated at the LHC and, if it was, not all the events are interesting for further analysis since the majority of them are low-momenta events. Therefore, detectors need a trigger system to select which events are interested for further analysis and store them. In order to achieve that, the CMS trigger system is a two-level system composed by the Level1 and the High Level Trigger (HLT) that reduces the event rate from the collision rate at the LHC (30GHz) to what is stored and analyzed offline (around 1KHz). When a collision takes place, the Level1 trigger performs a fast readout of the detector. From the information of the detector, basic quantities are created and a pure hardware decision is taken on whether the event should be accepted or not. The Level1 reduces...

  8. Commissioning of the CMS muon detector and development of generic search strategies for new physics

    Energy Technology Data Exchange (ETDEWEB)

    Biallass, Philipp Alexander

    2009-03-27

    The detection and reconstruction of cosmic muon rays is important for the commissioning phase and alignment of the Compact Muon Solenoid experiment (CMS), in particular during the early phases of operation with physics collisions. In this context the Magnet Test/Cosmic Challenge (MTCC) with its comprehensive cosmic data taking periods including the presence of the magnetic field has been like a dress rehearsal of detector hardware and software for the upcoming start-up of the CMS detector. In addition to data taking also the comparison with simulated events is a crucial part of physics analyses. The first part of this thesis introduces a new cosmic muon generator, CMSCGEN, and it presents its validation by comparing its predictions with data from MTCC. As an example, results from a reconstruction study using the barrel muon system are shown, comparing data and Monte Carlo prediction at the level of single chambers up to reconstructed tracks including momentum measurements. Since leptons (electrons, muons) constitute very clean signatures for signals of new physics these commissioning and alignment procedures are also vital to most physics analyses. In the second part of this thesis a model independent search approach for new physics within CMS is presented, utilizing events with leptons and relying only on the knowledge of the Standard Model simulation. Such an analysis can contribute to the understanding of the detector and the tuning of the event generators. Due to the absence of a theoretical bias this approach is sensitive to a variety of models, including those not yet thought of. Within this feasibility study events are classified according to their particle content (muons, electrons, photons, jets, missing energy) into so called event classes. A broad scan of various distributions is performed, identifying significant deviations from the SM Monte Carlo simulation. The importance of systematic uncertainties is outlined, which are taken into account rigorously

  9. Electronics for the CMS muon drift tube chambers the read-out minicrate

    CERN Document Server

    Fernandez Bedoya, Cristina; Oller, Juan Carlos; Willmott, Carlos

    2005-01-01

    On the Compact Muon Solenoid (CMS) experimentat the Large Hadron Collider (LHC) at the CERN laboratory, the drift tube chambers are responsible for muon detection and precise momentum measurement. In this paper the first level of the read out electronics for these drift tube chambers is described. These drift tube chambers will be located inside the muon barrel detector in the so-called minicrates (MCs), attached to the chambers. The read out boards (ROBs) are the main component of this first level data acquisition system, and they are responsible for the time digitalization related to Level 1 Accept (L1A) trigger of the incoming signals from the front-end electronics, followed by a consequent data merging to the next stages of the data acquisition system. ROBs' architecture and functionality have been exhaustively tested, as well as their capability of operation beyond the expected environmental conditions inside the CMS detector. Due to the satisfactory results obtained, final production of ROBs and their a...

  10. The Triple GEM Detector Control System for CMS forward muon spectrometer upgrade

    Science.gov (United States)

    Ahmed, W.; Abbaneo, D.; Abbrescia, M.; Abdelalim, A. A.; Abi. Akl, M.; Acosta, D.; Ahmad, A.; Ahmed, W.; Aleksandrov, A.; Aly, R.; Altieri, P.; Asawatangtrakuldee, C.; Aspell, P.; Assran, Y.; Awan, I.; Bally, S.; Ban, Y.; Banerjee, S.; Barashko, V.; Barria, P.; Bencze, G.; Beni, N.; Benussi, L.; Bhopatkar, V.; Bianco, S.; Bos, J.; Bouhali, O.; Holme, O.; Braghieri, A.; Braibant, S.; Buontempo, S.; Khan, S. A.; Calabria, C.; Caponero, M.; Caputo, C.; Cassese, F.; Castaneda, A.; Cauwenbergh, S.; Cavallo, F. R.; Celik, A.; Choi, M.; Choi, S.; Christiansen, J.; Cimmino, A.; Colafranceschi, S.; Colaleo, A.; Conde Garcia, A.; Czellar, S.; Dabrowski, M. M.; Lentdecker, G. De.; De Oliveira, R.; de Robertis, G.; Dildick, S.; Dorney, B.; Elmetenawee, W.; Endroczi, G.; Errico, F.; Fenyvesi, A.; Ferry, S.; Furic, I.; Giacomelli, P.; Gilmore, J.; Golovtsov, V.; Guiducci, L.; Guilloux, F.; Gutierrez, A.; Hadjiiska, R. M.; Hassan, A.; Hauser, J.; Hoepfner, K.; Hohlmann, M.; Hoorani, H.; Shah, A. H.; Iaydjiev, P.; Jeng, Y. G.; Kamon, T.; Karchin, P.; Korytov, A.; Krutelyov, S.; Kumar, A.; Kim, H.; Lenzi, T.; Litov, L.; Loddo, F.; Madorsky, A.; Maerschalk, T.; Maggi, M.; Magnani, A.; Mal, P. K.; Mandal, K.; Marchioro, A.; Marinov, A.; Majumdar, N.; Merlin, J. A.; Mitselmakher, G.; Mohanty, A. K.; Mohapatra, A.; Molnar, J.; Muhammad, S.; Mukhopadhyay, S.; Naimuddin, M.; Nuzzo, S.; Oliveri, E.; Pant, L. M.; Paolucci, P.; Park, I.; Passeggio, G.; Pavlov, B.; Philipps, B.; Piccolo, D.; Postema, H.; Puig. Baranac, A.; Radi, A.; Radogna, R.; Raffone, G.; Ranieri, A.; Rashevski, G.; Riccardi, C.; Rodozov, M.; Rodrigues, A.; Ropelewski, L.; RoyChowdhury, S.; Ryu, G.; Ryu, M. S.; Safonov, A.; Salva, S.; Saviano, G.; Sharma, A.; Sharma, R.; Shopova, M.; Sturdy, J.; Sultanov, G.; Swain, S. K.; Szillasi, Z.; Talvitie, J.; Tatarinov, A.; Tuuva, T.; Tytgat, M.; Vai, I.; Van Stenis, M.; Venditti, R.; Verhagen, E.; Verwilligen, P.; Vitulo, P.; Volkov, S.; Vorobyev, A.; Wang, D.; Wang, M.; Yang, U.; Yang, Y.; Yonamine, R.; Zaganidis, N.; Zenoni, F.; Zhang, A.

    2017-02-01

    The CMS experiment at LHC will upgrade its forward muon spectrometer by incorporating Triple-GEM detectors. This upgrade referred to as GEM Endcap (GE1/1), consists of adding two back-to-back Triple-GEM detectors in front of the existing Cathode Strip Chambers (CSC) in the innermost ring of the endcap muon spectrometer. Before the full installation of 144 detectors in 2019-2020, CMS will first install ten single chamber prototypes during the early 2017. This pre-installation is referred as the slice test. These ten detectors will be read-out by VFAT2 chips [1]. On-detector there is also a FPGA mezzanine card which sends VFAT2 data optically to the μTCA back-end electronics. The correct and safe operation of the GEM system requires a sophisticated and powerful online Detector Control System, able to monitor and control many heterogeneous hardware devices. The DCS system developed for the slice test has been tested with CMS Triple-GEM detectors in the laboratory. In this paper we describe the newly developed DCS system and present the first results obtained in the GEM assembly and quality assurance laboratory.

  11. 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...

  12. Anode Front-End Electronics for the Cathode Strip Chambers of the CMS Endcap Muon Detector

    CERN Document Server

    Ferguson, Thomas; Vorobev, I; Bondar, Nikolai; Golyash, Alexander; Sedov, Vladislav

    2001-01-01

    The front-end electronics system for the anode signals of the CMS Endcap Muon cathode strip chambers has about 183000 channels. The purposes of the anode front-end electronics are to acquire precise muon timing information for bunch crossing number identification at the Level-1 muon trigger system and to provide a coarse radial position of the muon track. Each anode channel consists of an input protection network, amplifier, shaper, constant-fraction discriminator, and a programmable delay. The essential parts of the electronics include a 16-channel amplifier-shaper-discriminator ASIC CMP16 and a 16-channel ASIC D16G providing programmable time delay. The ASIC CMP16 was optimized for the large cathode chamber size (up to 3 x 2.5 m2) and for the large input capacitance (up to 200 pf). The ASIC combines low power consumption (30 mW/channel) with good time resolution (2 - 3 ns). The del ay ASIC D16G makes possible the alignment of signals with an accuracy of 2.2 ns. This note presents the anode front-end electro...

  13. Implementation of position and angle uncertainties in the muon reconstruction of the CMS experiment, and impact on the performance.

    CERN Document Server

    Abbiendi, Giovanni

    2016-01-01

    The alignment of muon chambers relative to each other and to the inner tracker is crucial to achieve the optimal performance of muon reconstruction at high momentum, in particular the best possible momentum measurement. With the energy and luminosity increase in LHC Run2, the high momentum muons have become more important for the searches of new particles with masses around the TeV scale. The muon reconstruction of the CMS experiment has been recently improved and made more robust with the introduction of alignment uncertainties on the positions and angles of the segments in the muon chambers. Not only does the momentum resolution improve at high energy, but, owing to the better quality of the muon track building and fit, also the trigger efficiency increases, especially in the initial phase of data-taking, after the opening and closure of the detector.

  14. The Hadron Calorimeter of the Compact Muon Solenoid (CMS) (Proceedings to be published Nuclear Physics B)

    CERN Document Server

    Hagopian, V

    1997-01-01

    The Hadron Calorimeter of CMS is about 1,000 tons of copper and scintillator sandwich in a 4 tesla magnetic field. It will be built in three segments, the barrel surrounding the central portion and the two end caps. The scintillators will use a tower structure made of grooved megatiles with wavelength shifting ( WLS) fibers imbedded inside the grooves. The coverage extends to "eta" = 3.0 and is hermetic with very few gaps. The 1995 test beam data, taken inside a 3 tesla magnet, showed that it will work in a magnetic field and will require a tail catcher inside the muon system.

  15. Results and Consequences of Magnet Test and Cosmic Challenge of the CMS Barrel Muon Alignment System

    CERN Document Server

    Bencze, Gy L; Imrek, J; Molnàr, J; Novàk, D; Raics, P; Sass, V; Szabò, Zs; Svékely, G; Szillàsi, Z; PH-EP

    2007-01-01

    In the last year - as part of the first test of the CMS experiment at CERN [1] called Magnet Test and Cosmic Challenge (MTCC) - about 25% of the barrel muon position monitoring system was built and operated. The configuration enabled us to test all the elements of the system and its function in real conditions. The correct operation of the system has been demonstrated. About 500 full measurement cycles have been recorded. In the paper the setup –including the read-out and control - is described and the first preliminary results are presented.

  16. 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.

  17. The CMS muon system: status and upgrades for LHC Run-2 and performance of muon reconstruction with 13 TeV data

    Science.gov (United States)

    Battilana, C.

    2017-01-01

    The CMS muon system has played a key role for many physics results obtained from the LHC Run-1 and Run-2 data. During the Long Shutdown (2013-2014), as well as during the last year-end technical stop (2015-2016), significant consolidation and upgrades have been carried out on the muon detectors and on the L1 muon trigger. The algorithms for muon reconstruction and identification have also been improved for both the High-Level Trigger and the offline reconstruction. Results of the performance of muon detectors, reconstruction and trigger, obtained using data collected at 13 TeV centre-of-mass energy during the 2015 and 2016 LHC runs, will be presented. Comparison of simulation with experimental data will also be discussed where relevant. The system's state of the art performance will be shown, and the improvements foreseen to achieve excellent overall quality of muon reconstruction in CMS, in the conditions expected during the high-luminosity phase of Run-2, will be described.

  18. The CMS muon system status and upgrades for LHC run-2 and performance of muon reconstruction with 13 TeV data

    CERN Document Server

    Battilana, Carlo

    2016-01-01

    The CMS muon system has played a key role for many physics results obtained from the LHC Run-1 and Run-2 data. During the Long Shutdown (2013-2014), as well as during the last year-end technical stop (2015-2016), significant consolidation and upgrades have been carried out on the muon detectors and on the L1 muon trigger. The algorithms for muon reconstruction and identification have also been improved for both the High-Level Trigger and the offline reconstruction. Results of the performance of muon detectors, reconstruction and trigger, obtained using data collected at 13 TeV center-of-mass energy during the 2015 and 2016 LHC runs, will be presented. Comparison of simulation with experimental data will also be discussed where relevant. The system's state of the art performance will be shown, and the improvements foreseen to achieve excellent overall quality of muon reconstruction in CMS, in the conditions expected during the high-luminosity phase of Run-2, will be described.

  19. Performance of CMS muon reconstruction in pp collision events at $\\sqrt{s}$ = 7 TeV

    CERN Document Server

    Chatrchyan, Serguei; Sirunyan, Albert M; Tumasyan, Armen; Adam, Wolfgang; Bergauer, Thomas; Dragicevic, Marko; Erö, Janos; Fabjan, Christian; Friedl, Markus; Fruehwirth, Rudolf; Ghete, Vasile Mihai; Hammer, Josef; Hoch, Michael; Hörmann, Natascha; Hrubec, Josef; Jeitler, Manfred; Kiesenhofer, Wolfgang; Krammer, Manfred; Liko, Dietrich; Mikulec, Ivan; Pernicka, Manfred; Rahbaran, Babak; Rohringer, Christine; Rohringer, Herbert; Schöfbeck, Robert; Strauss, Josef; Taurok, Anton; Teischinger, Florian; Wagner, Philipp; Waltenberger, Wolfgang; Walzel, Gerhard; Widl, Edmund; Wulz, Claudia-Elisabeth; Mossolov, Vladimir; Shumeiko, Nikolai; Suarez Gonzalez, Juan; Bansal, Sunil; Benucci, Leonardo; Cornelis, Tom; De Wolf, Eddi A; Janssen, Xavier; Luyckx, Sten; Maes, Thomas; Mucibello, Luca; Ochesanu, Silvia; Roland, Benoit; Rougny, Romain; Selvaggi, Michele; Van Haevermaet, Hans; Van Mechelen, Pierre; Van Remortel, Nick; Van Spilbeeck, Alex; Blekman, Freya; Blyweert, Stijn; D'Hondt, Jorgen; Gonzalez Suarez, Rebeca; Kalogeropoulos, Alexis; Maes, Michael; Olbrechts, Annik; Van Doninck, Walter; Van Mulders, Petra; Van Onsem, Gerrit Patrick; Villella, Ilaria; Charaf, Otman; Clerbaux, Barbara; De Lentdecker, Gilles; Dero, Vincent; Gay, Arnaud; Hammad, Gregory Habib; Hreus, Tomas; Léonard, Alexandre; Marage, Pierre Edouard; Thomas, Laurent; Vander Velde, Catherine; Vanlaer, Pascal; Wickens, John; Adler, Volker; Beernaert, Kelly; Cimmino, Anna; Costantini, Silvia; Garcia, Guillaume; Grunewald, Martin; Klein, Benjamin; Lellouch, Jérémie; Marinov, Andrey; Mccartin, Joseph; Ocampo Rios, Alberto Andres; Ryckbosch, Dirk; Strobbe, Nadja; Thyssen, Filip; Tytgat, Michael; Vanelderen, Lukas; Verwilligen, Piet; Walsh, Sinead; Yazgan, Efe; Zaganidis, Nicolas; Basegmez, Suzan; Bruno, Giacomo; Ceard, Ludivine; De Favereau De Jeneret, Jerome; Delaere, Christophe; Du Pree, Tristan; Favart, Denis; Forthomme, Laurent; Giammanco, Andrea; Grégoire, Ghislain; Hollar, Jonathan; Lemaitre, Vincent; Liao, Junhui; Militaru, Otilia; Nuttens, Claude; Pagano, Davide; Pin, Arnaud; Piotrzkowski, Krzysztof; Schul, Nicolas; Beliy, Nikita; Caebergs, Thierry; Daubie, Evelyne; Alves, Gilvan; Correa Martins Junior, Marcos; De Jesus Damiao, Dilson; Martins, Thiago; Pol, Maria Elena; Henrique Gomes E Souza, Moacyr; Aldá Júnior, Walter Luiz; Carvalho, Wagner; Custódio, Analu; Da Costa, Eliza Melo; De Oliveira Martins, Carley; Fonseca De Souza, Sandro; Matos Figueiredo, Diego; Mundim, Luiz; Nogima, Helio; Oguri, Vitor; Prado Da Silva, Wanda Lucia; Santoro, Alberto; Silva Do Amaral, Sheila Mara; Soares Jorge, Luana; Sznajder, Andre; Souza Dos Anjos, Tiago; Bernardes, Cesar Augusto; De Almeida Dias, Flavia; Tomei, Thiago; De Moraes Gregores, Eduardo; Lagana, Caio; Da Cunha Marinho, Franciole; Mercadante, Pedro G; Novaes, Sergio F; Padula, Sandra; Genchev, Vladimir; Iaydjiev, Plamen; Piperov, Stefan; Rodozov, Mircho; Stoykova, Stefka; Sultanov, Georgi; Tcholakov, Vanio; Trayanov, Rumen; Vutova, Mariana; Dimitrov, Anton; Hadjiiska, Roumyana; Karadzhinova, Aneliya; Kozhuharov, Venelin; Litov, Leander; Pavlov, Borislav; Petkov, Peicho; Bian, Jian-Guo; Chen, Guo-Ming; Chen, He-Sheng; Jiang, Chun-Hua; Liang, Dong; Liang, Song; Meng, Xiangwei; Tao, Junquan; Wang, Jian; Wang, Jian; Wang, Xianyou; Wang, Zheng; Xiao, Hong; Xu, Ming; Zang, Jingjing; Zhang, Zhen; Asawatangtrakuldee, Chayanit; Ban, Yong; Guo, Shuang; Guo, Yifei; Li, Wenbo; Liu, Shuai; Mao, Yajun; Qian, Si-Jin; Teng, Haiyun; Wang, Siguang; Zhu, Bo; Zou, Wei; Cabrera, Andrés; Gomez Moreno, Bernardo; Osorio Oliveros, Andres Felipe; Sanabria, Juan Carlos; Godinovic, Nikola; Lelas, Damir; Plestina, Roko; Polic, Dunja; Puljak, Ivica; Antunovic, Zeljko; Dzelalija, Mile; Kovac, Marko; Brigljevic, Vuko; Duric, Senka; Kadija, Kreso; Luetic, Jelena; Morovic, Srecko; Attikis, Alexandros; Galanti, Mario; Mousa, Jehad; Nicolaou, Charalambos; Ptochos, Fotios; Razis, Panos A; Finger, Miroslav; Finger Jr, Michael; Assran, Yasser; Ellithi Kamel, Ali; Khalil, Shaaban; Mahmoud, Mohammed; Radi, Amr; Hektor, Andi; Kadastik, Mario; Müntel, Mait; Raidal, Martti; Rebane, Liis; Tiko, Andres; Azzolini, Virginia; Eerola, Paula; Fedi, Giacomo; Voutilainen, Mikko; Czellar, Sandor; Härkönen, Jaakko; Heikkinen, Mika Aatos; Karimäki, Veikko; Kinnunen, Ritva; Kortelainen, Matti J; Lampén, Tapio; Lassila-Perini, Kati; Lehti, Sami; Lindén, Tomas; Luukka, Panja-Riina; Mäenpää, Teppo; Peltola, Timo; Tuominen, Eija; Tuominiemi, Jorma; Tuovinen, Esa; Ungaro, Donatella; Wendland, Lauri; Banzuzi, Kukka; Korpela, Arja; Tuuva, Tuure; Sillou, Daniel

    2012-01-01

    The performance of muon reconstruction, identification, and triggering in CMS has been studied using 40 inverse picobarns of data collected in pp collisions at $\\sqrt{s}$ = 7 TeV at the LHC in 2010. A few benchmark sets of selection criteria covering a wide range of physics analysis needs have been examined. For all considered selections, the efficiency to reconstruct and identify a muon with a transverse momentum $p_T$ larger than a few GeV is above 95% over the whole region of pseudorapidity covered by the CMS muon system, abs(eta)<2.4, while the probability to misidentify a hadron as a muon is well below 1%. The efficiency to trigger on single muons with $p_T$ above a few GeV is higher than 90% over the full eta range, and typically substantially better. The overall momentum scale is measured to a precision of 0.2% with muons from Z decays. The transverse momentum resolution varies from 1% to 6% depending on pseudorapidity for muons with $p_T$ below 100 GeV and, using cosmic rays, it is shown to be bett...

  20. Muon Chamber Endcap Upgrade of the CMS Experiment with Gas Electron Multiplier (GEM) Detectors and their Performance

    CERN Document Server

    Gola, Mohit

    2017-01-01

    As the CERN LHC is heading towards a high luminosity phase a very high flux is expected in the endcaps of the CMS Detector. The presence of muons in collision events can be due to rare or new physics so it is important to maintain the high trigger efficiency of the CMS muon system. The CMS Collaboration has proposed to instrument the high-eta region (1.6 lt IetaI lt 2.2) of the muon endcaps with Gas Electron Multiplier (GEM) detectors, referred to as GE1/1 chambers, during the LS2. This technology will help in maintaining optimum trigger performance with maximum selection efficiency of muons even in a high flux environment. We describe plans for a Slice Test to installa few GE1/1 chambers covering 50 degrees in azimuthal angle within the CMS detector in 2017, with subsequent operation during the current Run 2 of the LHC. We show the performance of the GE1/1 chambers to be installed during the slice test, specifically GEM foil leakage currents, chamber gas volume integrity, high voltage circuit performanc...

  1. The CMS Level-1 Trigger Barrel Track Finder

    CERN Document Server

    AUTHOR|(CDS)2069737; Evangelou, Ioannis; Flouris, G; Foudas, Costas; Guiducci, Luigi; Loukas, Nikitas; Manthos, Nikolaos; Papadopoulos, Ioannis; Paradas, Evangelos; Sotiropoulos, S; Sphicas, D; Triossi, Andrea; Wulz, Claudia

    2016-01-01

    The design and performance of the upgraded CMS Level-1 Trigger Barrel Muon Track Finder (BMTF) is presented. Monte Carlo simulation data as well as cosmic ray and pp data from a CMS muon detector slice test have been used to study in detail the performance of the new track finder. The design architecture is based on twelve MP7 cards which use a Xilinx Virtex-7 FPGA and can receive and transmit data at 10 Gbps from 72 input and 72 output fibers. According to the CMS Trigger Upgrade TDR the BMTF receives trigger primitive data which are computed using both RPC and DT data and transmits data from a number of muon candidates to the upgraded Global Muon Trigger. Results from detailed studies of comparisons between the BMTF algorithm results and the results of a C++ emulator are also presented. The new BMTF will be commissioned for data taking in 2016.

  2. The CMS Level-1 Trigger Barrel Track Finder

    Science.gov (United States)

    Ero, J.; Evangelou, I.; Flouris, G.; Foudas, C.; Guiducci, L.; Loukas, N.; Manthos, N.; Papadopoulos, I.; Paradas, E.; Sotiropoulos, S.; Sphicas, P.; Triossi, A.; Wulz, C.

    2016-03-01

    The design and performance of the upgraded CMS Level-1 Trigger Barrel Muon Track Finder (BMTF) is presented. Monte Carlo simulation data as well as cosmic ray data from a CMS muon detector slice test have been used to study in detail the performance of the new track finder. The design architecture is based on twelve MP7 cards each of which uses a Xilinx Virtex-7 FPGA and can receive and transmit data at 10 Gbps from 72 input and 72 output fibers. According to the CMS Trigger Upgrade TDR the BMTF receives trigger primitive data which are computed using both RPC and DT data and transmits data from a number of muon candidates to the upgraded Global Muon Trigger. Results from detailed studies of comparisons between the BMTF algorithm results and the results of a C++ emulator are also presented. The new BMTF will be commissioned for data taking in 2016.

  3. A Simulation of the Front End Signal Digitization for the ATLAS Muon Spectrometer thin RPC trigger upgrade project

    Science.gov (United States)

    Meng, Xiangting; Chapman, John; Levin, Daniel; Dai, Tiesheng; Zhu, Junjie; Zhou, Bing; Um Atlas Group Team

    2016-03-01

    The ATLAS Muon Spectrometer Phase-I (and Phase-II) upgrade includes the BIS78 muon trigger detector project: two sets of eight very thin Resistive Place Chambers (tRPCs) combined with small Monitored Drift Tube (MDT) chambers in the pseudorapidity region 1Phase-I operation, a stringent latency requirement of 43 bunch crossings (1075 ns) is imposed. The latency budget for the front end digitization must be kept to a minimal value, ideally less than 350 ns. We conducted detailed HPTDC latency simulations using the Behavioral Verilog code from the CERN group. We will report the results of these simulations run for the anticipated detector operating environment and for various HPTDC configurations.

  4. Study of the Internal Alignment of the CMS Muon Barrel Drift Chambers Using Cosmic Ray Tracks

    CERN Document Server

    Benettoni, Massimo; Conti, Enrico; Dosselli, Umberto; Gasparini, Fabrizio; Gasparini, Ugo; Gonella, Franco; Lacaprara, Stefano; Lippi, Ivano; Meneguzzo, Anna Teresa; Passaseo, Marina; Pegoraro, Matteo; Ronchese, Paolo; Vanini, Sara; Torassa, Ezio; Ventura, Sandro; Zanetti, Marco; Zotto, Pierluigi; Zumerle, Gianni; Gulmini, Michele; Maron, Gaetano; Toniolo, Nicola

    2004-01-01

    This note describes the alignment studies performed on 21 Muon Barrel Drift Tube chambers for the CMS experiment, assembled in the INFN production center at the Legnaro National Laboratories. Data were collected using the cosmic ray test facility which was setup in Legnaro to test the chamber behaviour before being moved to CERN. An alignment procedure using cosmic ray tracks has been developed, allowing a measurement of the internal misalignment of the wire layers inside a chamber "superlayer" (SL) and of the relative misalignment of the 2 SL's in the r-phi bending plane. The analysis shows that the wire layers are positioned with an rms precision of about 45 micron; the relative positioning of the 2 SL's in the r-phi bending plane is meausured to have a distribution with ~ 50 micron average value and 200 micron rms.

  5. Design and Performance of the Alignment System for the CMS Muon Endcaps

    CERN Document Server

    Hohlmann, Marcus; Browngold, Max; Dehmelt, Klaus; Guragain, Samir; Andreev, Valery; Yang, Xiaofeng; Bellinger, James; Carlsmith, Duncan; Feyzi, Farshid; Loveless, Richard J; Northacker, David; Case, Michael; Eartly, David P; Prokofiev, Oleg; Sknar, Vladimir; Sytnik, Valeri

    2008-01-01

    The alignment system for the CMS Muon Endcap detector employs several hundred sensors such as optical 1-D CCD sensors illuminated by lasers and analog distance- and tilt-sensors to monitor the positions of one sixth of 468 large Cathode Strip Chambers. The chambers mounted on the endcap yoke disks undergo substantial deformation on the order of centimeters when the 4T field is switched on and off. The Muon Endcap alignment system is required to monitor chamber positions with \\mbox{75-200 $\\mu$m} accuracy in the R$\\phi$ plane, $\\approx$400 $\\mu$m in the radial direction, and $\\approx$1 mm in the z-direction along the beam axis. The complete alignment hardware for one of the two endcaps has been installed at CERN. A major system test was performed when the 4T solenoid magnet was ramped up to full field for the first time in August 2006. We present the overall system design and first results on disk deformations, which indicate that the measurements agree with expectations.

  6. Performance of the Drift Chambers of the CMS Experiment in the Measurement of LHC Muons; Prestaciones de las Camaras de Deriva del Experimento CMS en la Deteccion de Muones del LHC

    Energy Technology Data Exchange (ETDEWEB)

    Dominguez, D.; Fouz, M. C.

    2011-05-13

    This work deals with the study of the performance of the drift chambers of the CMS Barrel Muon detector operating at the LHC. Using the data obtained with pp collisions during the first months os LHC operation we have studied the drift cell efficiency and position resolution, as well as the effect of the existing background noise. The results confirm the excellent performance of the muon chambers. It is expected that it will improve further as statistics increase, thus allowing a correct calibration and alignment of these chambers. (Author) 6 refs.

  7. Test beam studies of Gas Electron Multiplier (GEM) detectors for the upgrade of CMS endcap muon system

    CERN Document Server

    Sharma, Ram Krishna

    2017-01-01

    The High Luminosity LHC (HL-LHC) will provide exceptional high instantaneous and integrated luminosity. The forward region $\\mid \\eta \\mid \\geq 1.5$ of the CMS detector will face extremely high particle rates in tens of $KHz/cm^{2}$ and hence it will affect the momentum resolution and longevity of the muon detectors. To overcome these issues the CMS collaboration has decided to install new large size rate capable Triple Gas Electron Multiplier (GEM) detectors in the forward region of CMS muon system. The first set of Triple GEM detectors will be installed in the GE1/1 region $(1.5 \\leq \\eta \\leq 2.2)$ of muon endcap during the LS2 of the LHC and the next one will be installed in the GE2/1 region $(1.6 \\leq \\eta \\leq 2.5)$, during the LS3. 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 $Ar/CO_{2}$ (70/30) and $Ar/CO_{2}/CF_{4}$ (40/15/45). In 2014 and 2016, ...

  8. Rate-capability study for a four-gap phenolic RPC with a Cs-137 source

    CERN Document Server

    Lee, Kyong Sei

    2014-01-01

    We report test results of a prototype four-gap phenolic resistive plate chamber (RPC) with high-rate gamma rays irradiated from a 200-mCi 137Cs source. The detector signals of the prototype four-gap RPC were digitized at charge thresholds of 80, 130, and 170 fC by using a 32-channel front-end-electronics board, previously developed for the current double-gap RPCs in CMS. We confirmed from the test that the cosmic muons were reliably measured with efficiencies higher than 95pct up to a gamma-background rate of 5.3 kHz cm-2. We concluded from the present R and D that use of the current four-gap phenolic RPCs is advantageous to the high-η triggers in CMS in virtue of the high rate capability.

  9. Neutron-induced Single Event Upset on the RPC front-end chips for the CMS experiment

    CERN Document Server

    Abbrescia, M; Belli, G; Bruno, G; Colaleo, A; De Bari, A; Guida, R; Iaselli, G; Loddo, F; Maggi, M; Manera, S; Marangelli, B; Merlo, M; Natali, S; Nuzzo, S; Pugliese, G; Ranieri, A; Ratti, S P; Riccardi, C; Romano, F; Torre, P; Vitulo, P

    2002-01-01

    Neutrons from a reactor and from a cyclotron have been used to characterise the CMS Resistive Plate Chambers (RPCs) front-end chip to neutron-induced damaging events. Single Event Upset (SEU) cross-sections have been measured up to 60 MeV for different chip thresholds. Tests at a reactor were done with an integrated fast (E sub n >3 MeV) neutron fluence of 1.7x10 sup 1 sup 0 cm sup - sup 2 and a thermal neutron fluence of 9.5x10 sup 1 sup 1 cm sup - sup 2. High-energy neutrons from a cyclotron were used up to a fluence of 10 sup 1 sup 2 cm sup - sup 2. Data indicate the existence of a chip SEU sensitivity already at thermal energy and a saturated SEU cross-section from 3 to 60 MeV. Values of the SEU cross-sections from the thermal run well agree with those obtained by another CMS group that uses the same technology (0.8 mu m BiCMOS) though with different architecture. Cross-sections obtained with fast neutrons (from 3 MeV to about 10 MeV) are consistently higher by one order of magnitude compared to the therm...

  10. Drift Tube based Pseudorapidity Assignment of the Level-1 Muon Trigger for the CMS Experiment at CERN

    CERN Document Server

    Brugger, Markus; Wulz, Claudia-Elisabeth

    2002-01-01

    CMS, the Compact Muon Solenoid experiment under construction at the CERN Large Hadron Collider, will explore new physics at high energies. Proton-proton and heavy-ion collisions will be studied. Muons with large transverse momenta are expected to be among the decay products of many new particles. Their identification and selection is the task of the trigger system. Specifically, the Level-1 Muon Trigger has to search for muon candidates and to determine their parameters at a rate of 40 MHz, corresponding to a beam crossing interval of 25 ns. The precise knowledge of the spatial parameters of a track allows to fully make use of the possibility to select topological trigger conditions already at Level-1 in CMS. Track segments measured in orthogonal layers of drift tube chambers arecombined to form a muon candidate. Its transverse momentum is calculated from the track curvature in the (r/ph i)-projection caused by a magnetic field along the beam direction z. The azimuthal angle phi in the plane transverse to the...

  11. Quality Control Procedures Applied to the CMS Muon Chambers Built at CIEMAT; Procedimientos de Control de Calildad de las Camaras de Muones del Experimento CMS Construidas en el CIEMAT

    Energy Technology Data Exchange (ETDEWEB)

    Fouz, M. C.; Puerta Pelayo, J.

    2004-07-01

    In this document the quality control procedures applied to the CMS muon drift chmabers built at CIEMAT are described. It includes a description of the high voltage and front electronics associated to the chambers. Every procedure is described with detail and a list of the more common problems and possible solutions is given. This document can be considered as a chambert test handbook for beginners. (Author) 3 refs.

  12. The RPC system of the OPERA experiment

    Energy Technology Data Exchange (ETDEWEB)

    Bertolin, A.; Brugnera, R. [INFN and Padova University, via Marzolo 8, 35131 Padova (Italy); Candela, A. [Laboratori Nazionali del Gran Sasso, INFN, Assergi (Italy); Cararra, E.; Castellani, L. [INFN and Padova University, via Marzolo 8, 35131 Padova (Italy); Cazes, A.; Corradi, G. [Laboratori Nazionali di Frascati, INFN, Frascati (Italy); Dal Corso, F. [INFN and Padova University, via Marzolo 8, 35131 Padova (Italy); D' Incecco, M.; Di Giovanni, A. [Laboratori Nazionali del Gran Sasso, INFN, Assergi (Italy); Dusini, S. [INFN and Padova University, via Marzolo 8, 35131 Padova (Italy)], E-mail: stefano.dusini@pd.infn.it; Felici, G. [Laboratori Nazionali di Frascati, INFN, Frascati (Italy); Garfagnini, A. [INFN and Padova University, via Marzolo 8, 35131 Padova (Italy); Gustavino, C.; Lindozzi, A. [Laboratori Nazionali del Gran Sasso, INFN, Assergi (Italy); Lippi, I.; Longhin, A. [INFN and Padova University, via Marzolo 8, 35131 Padova (Italy); Mengucci, A.; Paoloni, A. [Laboratori Nazionali di Frascati, INFN, Frascati (Italy); Papalino, G. [Rudjer Boskovic Institute (IRB), Zagreb (Croatia)] (and others)

    2009-05-01

    The OPERA experiment is designed to study the {nu}{sub {mu}}{yields}{nu}{sub {tau}} oscillation observing the {nu}{sub {tau}} appearance in a pure {nu}{sub {mu}} beam over a base line of 732 km from CERN to Gran Sasso Laboratory. The apparatus consists of a lead/emulsion-film target complemented by electronic detectors and muon spectrometers for muon charge and momentum measurements. The tracking inside the magnets is provide by Bakelite RPC chambers in a large scale application. The commissioning of the RPC system ended in August 2006. The paper present the layout of the RPC system and its performances.

  13. Quality Control of the Large-area GEM detectors at Production Sites for the CMS Muon Endcap Upgrade

    Science.gov (United States)

    Rahmani, Mehdi; CMS Collaboration

    2017-01-01

    GEM (Gas Electron Multipliers) detectors will be installed in the high-eta region of the CMS muon system by the year 2019. With precise tracking and fast trigger information, these detectors will significantly improve the CMS muon triggering after the second long shutdown of the LHC. There are six sites, external to CERN, where at total of 160 1-meter long GEM detectors will be produced. We present the detector construction and discuss the critical quality control (QC) procedures implemented for chamber commissioning. Some of the most important QCs discussed are: current leakage tests, gas leak tests, gain measurements, high voltage test and response uniformity test. We discuss the criteria that are used to accept or reject a GEM detector based on the QC results. The production and QC status will be presented as well.

  14. 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

  15. Development of the DAQ System of Triple-GEM Detectors for the CMS Muon Spectrometer Upgrade at LHC

    CERN Document Server

    AUTHOR|(INSPIRE)INSPIRE-00387583

    The Gas Electron Multiplier (GEM) upgrade project aims at improving the performance of the muon spectrometer of the Compact Muon Solenoid (CMS) experiment which will suffer from the increase in luminosity of the Large Hadron Collider (LHC). After a long technical stop in 2019-2020, the LHC will restart and run at a luminosity of 2 × 1034 cm−2 s−1, twice its nominal value. This will in turn increase the rate of particles to which detectors in CMS will be exposed and affect their performance. The muon spectrometer in particular will suffer from a degraded detection efficiency due to the lack of redundancy in its most forward region. To solve this issue, the GEM collaboration proposes to instrument the first muon station with Triple-GEM detectors, a technology which has proven to be resistant to high fluxes of particles. Within the GEM collaboration, the Data Acquisition (DAQ) subgroup is in charge of the development of the electronics and software of the DAQ system of the detectors. This thesis presents th...

  16. Design features and test results of the CMS endcap muon chambers

    CERN Document Server

    Acosta, D; Arisaka, K; Blomqvist, J M; Breedon, R; Bondar, N; Bonushkin, Yu; Borissov, E; Bujak, A; Bylsma, B; Chester, N S; Chrisman, D; Clare, R; Cline, D; Cousins, R D

    2002-01-01

    Presented are the main design features and performance results of the Cathode Strip Chambers for the CMS Endcap Muon system. Although the strips are unusually wide (up to 16 mm) for the cathode-to-anode wire distance of 5 mm, the six-plane structure of these chambers yields a spatial resolution of about 80 mum, essentially uniform and independent of the strip width. In addition, the net spatial resolution of about one-tenth of the strip width at the hardware trigger level (300 ns) is obtained using a simple network of comparators. Time resolution achieved at the trigger level is similar to 4 ns (rms) that allows unambiguous tagging of bunch crossings which occur every 25 ns. Aging test results, including those obtained with a recirculating gas system, are discussed; only minor aging affects were observed. The aging studies were performed with large- scale chambers; 700 m of wire were irradiated for a dose up to 0.4 C /cm of the total accumulated charge.

  17. Data Quality Monitoring System for New GEM Muon Detectors for the CMS Experiment Upgrade

    Science.gov (United States)

    King, Robert; CMS Muon group Team

    2017-01-01

    The Gas Electron Multiplier (GEM) detectors are novel detectors designed to improve the muon trigger and tracking performance in CMS experiment for the high luminosity upgrade of the LHC. Partial installation of GEM detectors is planned during the 2016-2017 technical stop. Before the GEM system is installed underground, its data acquisition (DAQ) electronics must be thoroughly tested. The DAQ system includes several commercial and custom-built electronic boards running custom firmware. The front-end electronics are radiation-hard and communicate via optical fibers. The data quality monitoring (DQM) software framework has been designed to provide online verification of the integrity of the data produced by the detector electronics, and to promptly identify potential hardware or firmware malfunctions in the system. Local hits reconstruction and clustering algorithms allow quality control of the data produced by each GEM chamber. Once the new detectors are installed, the DQM will monitor the stability and performance of the system during normal data-taking operations. We discuss the design of the DQM system, the software being developed to read out and process the detector data, and the methods used to identify and report hardware and firmware malfunctions of the system.

  18. from left to right : Mr Michel Della Negra (Last spokeperson of CMS), Prof. Tejinder ("Jim") Virdee (actual spokeperson of CMS), Mr Robert Aymar (CERN Director General) and Mr Sigurd Lettow (Chief Financial Officer of CERN) assist to the Lowering of the final element (YE-1) of the Compact Muon Solenoid (CMS) detector into its underground experimental cavern.

    CERN Multimedia

    Maximilien Brice

    2008-01-01

    from left to right : Mr Michel Della Negra (Last spokeperson of CMS), Prof. Tejinder ("Jim") Virdee (actual spokeperson of CMS), Mr Robert Aymar (CERN Director General) and Mr Sigurd Lettow (Chief Financial Officer of CERN) assist to the Lowering of the final element (YE-1) of the Compact Muon Solenoid (CMS) detector into its underground experimental cavern.

  19. 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

  20. Alternative RPC Coatings

    Science.gov (United States)

    Strack, Jason

    2009-10-01

    The nuclear physics group at the University of Illinois is currently developing techniques to further improve the performance of Bakelite Resistive Plate Chambers (RPCs) for use as muon trigger detectors in experiments at hadron colliders. Muon trigger RPCs at LHC and RHIC typically use Bakelite plates coated with linseed oil. Both Bakelite and linseed oil, however, have high bulk and surface resistivity thus limiting the detection efficiency of the RPC at high rates. Experiments which dope the linseed oil with either carbon or copper are carried out with the goal to select targeted lower surface resistivity values for the coating applied to the Bakelite plates. Two doping procedures have been studied. In the first method a thin layer of graphite is deposited between the Bakelite and the linseed oil. For the second method the graphite or copper powder are deposited on top of the drying linseed oil coating. In this presentation the coating methods will be discussed and the effects of the coating on the RPC position resolution, cluster size and efficiencies will be discussed.

  1. Characterization of GEM Detectors for Application in the CMS Muon Detection System

    CERN Document Server

    Abbaneo, D; Postema, H.; Conde Garcia, A.; Chatelain, J.P.; Faber, G.; Ropelewski, L.; David, E.; Duarte Pinto, S.; Croci, G.; Alfonsi, M.; van Stenis, M.; Sharma, A.; Benussi, L.; Bianco, S.; Colafranceschi, S.; Piccolo, D.; Saviano, G.; Turini, N.; Oliveri, E.; Magazzu', G.; Marinov, A.; Tytgat, M.; Zaganidis, N.; Hohlmann, M.; Gnanvo, K.; Ban, Y.; Teng, H.; Cai, J.

    2010-01-01

    The muon detection system of the Compact Muon Solenoid experiment at the CERN Large Hadron Collider is based on different technologies for muon tracking and triggering. In particular, the muon system in the endcap disks of the detector consists of Resistive Plate Chambers for triggering and Cathode Strip Chambers for tracking. At present, the endcap muon system is only partially instrumented with the very forward detector region remaining uncovered. In view of a possible future extension of the muon endcap system, we report on a feasibility study on the use of Micro-Pattern Gas Detectors, in particular Gas Electron Multipliers, for both muon triggering and tracking. Results on the construction and characterization of small tripleGas Electron Multiplier prototype detectors are presented.

  2. A Proposal for the Upgrade of the Muon Drift Tubes Trigger for the CMS Experiment at the HL-LHC

    Science.gov (United States)

    Pozzobon, Nicola; Zotto, Pierluigi; Montecassiano, Fabio

    2016-11-01

    A major upgrade of the readout and trigger electronics of the CMS Drift Tubes muon detector is foreseen in order to allow its efficient operation at the High Luminosity LHC. A proposal for a new L1 Trigger Primitives Generator for this detector is presented, featuring an algorithm operating on the time of charge collection measurements provided by the asynchronous readout of the new TDC system being developed. The algorithm is being designed around the implementation in state-of-the-art FPGA devices of the original development of a Compact Hough Transform (CHT) algorithm combined with a Majority Mean-Timer, to identify both the parent bunch crossing and the muon track parameters. The current state of the design is presented along with the performance requirements, focusing on the future developments.

  3. CMS Resistive Plate Chambers performance at $\\sqrt{s}=$13 TeV

    CERN Document Server

    Cabrera Mora, Andres Leonardo

    2016-01-01

    During 2015, the Large Hadron Collider (LHC) at CERN has reached the record-breaking center-of-mass energy of 13 TeV for proton-proton collisions. The LHC restarted operations successfully after a two-year technical stop, known as Long Shutdown 1 (LS1), needed for servicing and consolidating the CERN accelerator complex. The Compact Muon Solenoid detector, a general-purpose detector at LHC, benefited from LS1 by performing crucial tasks necessary to operate the detector at higher energies. In particular, the Resistive Plate Chamber (RPC) system, one of the three muon detector technologies in CMS, was serviced, re-commissioned, and upgraded with 144 new chambers to enhance muon trigger efficiency. The CMS RPC system confers robustness and redundancy to the muon trigger. A total of 1056 double-gap chambers cover the pseudo-rapidity region $ \\lvert\\eta\\rvert \\leq$1.6. The CMS RPC collaboration has exploited early data samples at 13 TeV for detector performance studies. These data allowed for a first characte...

  4. A proposed Drift Tubes-seeded muon track trigger for the CMS experiment at the High Luminosity-LHC

    Science.gov (United States)

    Pozzobon, N.; Lazzizzera, I.; Vanini, S.; Zotto, P.

    2016-07-01

    The LHC program at 13 and 14 TeV, after the observation of the candidate SM Higgs boson, will help clarify future subjects of study and shape the needed tools. Any upgrade of the LHC experiments for unprecedented luminosities, such as the High Luminosity-LHC ones, must then maintain the acceptance on electroweak processes that can lead to a detailed study of the properties of the candidate Higgs boson. The acceptance of the key lepton, photon and hadron triggers should be kept such that the overall physics acceptance, in particular for low-mass scale processes, can be the same as the one the experiments featured in 2012. In such a scenario, a new approach to early trigger implementation is needed. One of the major steps will be the inclusion of high-granularity tracking sub-detectors, such as the CMS Silicon Tracker, in taking the early trigger decision. This contribution can be crucial in several tasks, including the confirmation of triggers in other subsystems, and the improvement of the on-line momentum measurement resolution. A muon track-trigger for the CMS experiment at the High Luminosity-LHC is presented. A back-extrapolation of Drift Tubes trigger primitives is proposed to match tracks found at Level 1 with muon candidates. The main figures-of-merit are presented, featuring sharp thresholds and less contamination from lower momentum muons, and an expected rate reduction of a factor of 5-10 at typical thresholds with respect to the muon trigger configuration used in 2012.

  5. A proposed Drift Tubes-seeded muon track trigger for the CMS experiment at the High Luminosity-LHC

    Energy Technology Data Exchange (ETDEWEB)

    Pozzobon, N., E-mail: nicola.pozzobon@pd.infn.it [Università degli Studi di Padova, Padova (Italy); Istituto Nazionale di Fisica Nucleare – Sezione di Padova, Padova (Italy); Lazzizzera, I. [Università degli Studi di Trento, Trento (Italy); Trento Institute for Fundamental Physics and Applications, Trento (Italy); Vanini, S.; Zotto, P. [Università degli Studi di Padova, Padova (Italy); Istituto Nazionale di Fisica Nucleare – Sezione di Padova, Padova (Italy)

    2016-07-11

    The LHC program at 13 and 14 TeV, after the observation of the candidate SM Higgs boson, will help clarify future subjects of study and shape the needed tools. Any upgrade of the LHC experiments for unprecedented luminosities, such as the High Luminosity-LHC ones, must then maintain the acceptance on electroweak processes that can lead to a detailed study of the properties of the candidate Higgs boson. The acceptance of the key lepton, photon and hadron triggers should be kept such that the overall physics acceptance, in particular for low-mass scale processes, can be the same as the one the experiments featured in 2012. In such a scenario, a new approach to early trigger implementation is needed. One of the major steps will be the inclusion of high-granularity tracking sub-detectors, such as the CMS Silicon Tracker, in taking the early trigger decision. This contribution can be crucial in several tasks, including the confirmation of triggers in other subsystems, and the improvement of the on-line momentum measurement resolution. A muon track-trigger for the CMS experiment at the High Luminosity-LHC is presented. A back-extrapolation of Drift Tubes trigger primitives is proposed to match tracks found at Level 1 with muon candidates. The main figures-of-merit are presented, featuring sharp thresholds and less contamination from lower momentum muons, and an expected rate reduction of a factor of 5–10 at typical thresholds with respect to the muon trigger configuration used in 2012.

  6. Construction of the first full-size GEM-based prototype for the CMS high-$\\eta$ muon system

    CERN Document Server

    Abbaneo, D; Postema, H; Conde Garcia, A; Chatelain, J P; Faber, G; Ropelewski, L; Duarte Pinto, S; Croci, G; Alfonsi, M; Van Stenis, M; Sharma, A; Benussi, L; Bianco, S; Colafranceschi, S; Fabbri, F; Passamonti, L; Piccolo, D; Pierluigi, D; Raffone, G; Russo, A; Saviano, G; Marinov, A; Tytgat, M; Zaganidis, N; Hohlmann, M; Gnanvo, K; Bagliesi, M G; Cecchi, R; Turini, N; Oliveri, E; Magazzù, G; Ban, Y; Teng, H; Cai, J

    2010-01-01

    In view of a possible extension of the forward CMS muon detector system and future LHC luminosity upgrades, Micro-Pattern Gas Detectors (MPGDs) are an appealing technology. They can simultaneously provide precision tracking and fast trigger information, as well as sufficiently fine segmentation to cope with high particle rates in the high-eta region at LHC and its future upgrades. We report on the design and construction of a full-size prototype for the CMS endcap system, the largest Triple-GEM detector built to-date. We present details on the 3D modeling of the detector geometry, the implementation of the readout strips and electronics, and the detector assembly procedure.

  7. A search for long-lived particles that stop in the CMS detector and decay to muons

    Energy Technology Data Exchange (ETDEWEB)

    Alimena, Juliette [Brown Univ., Providence, RI (United States)

    2016-05-01

    A search for long-lived particles that are produced in proton-proton collisions at the CERN LHC, come to rest in the CMS detector, and decay to muons is presented. The decays of the stopped particles could be observed during the intervals between LHC beam crossings, at times that are well separated from any proton-proton collisions. The analysis uses 19.7 1/fb of 8 TeV data collected by CMS in 2012, during a search interval of 293 hours of trigger livetime. Massive, long-lived particles do not exist in the Standard Model, and so any sign of them would be an indication of new physics. The results are interpreted with a model that predicts a long-lived particle that has a charge of twice the electron charge and that behaves like a lepton. Cross section limits are set for each long-lived particle mass as a function of lifetime, for lifetimes between 100 ns and 10 days. These are the first limits for long-lived stopped particles that decay to muons.

  8. Performance of a Large-Area GEM Detector Prototype for the Upgrade of the CMS Muon Endcap System

    CERN Document Server

    INSPIRE-00317764; Abbas, M.; Abbrescia, M.; Abdelalim, A.A.; Abi Akl, M.; Ahmed, W.; Ahmed, W.; Altieri, P.; Aly, R.; Asawatangtrakuldee, C.; Ashfaq, A.; Aspell, P.; Assran, Y.; Awan, I.; Bally, S.; Ban, Y.; Banerjee, S.; Barria, P.; Benussi, L.; Bhopatkar, V.; Bianco, S.; Bos, J.; Bouhali, O.; Braibant, S.; Buontempo, S.; Calabria, C.; Caponero, M.; Caputo, C.; Cassese, F.; Castaneda, A.; Cauwenbergh, S.; Cavallo, F.R.; Celik, A.; Choi, M.; Choi, K.; Choi, S.; Christiansen, J.; Cimmino, A.; Colafranceschi, S.; Colaleo, A.; Conde Garcia, A.; Dabrowski, M.M.; De Lentdecker, G.; de Oliveira, R.; De Robertis, G.; Dildick, S.; Dorney, B.; Elmetenawee, W.; Fabrice, G.; Ferrini, M.; Ferry, S.; Giacomelli, P.; Gilmore, J.; Guiducci, L.; Gutierrez, A.; Hadjiiska, R.M.; Hassan, A.; Hauser, J.; Hoepfner, K.; Hohlmann, M.; Hoorani, H.; Jeng, Y.G.; Kamon, T.; Karchin, P.E.; Kim, H.S.; Krutelyov, S.; Kumar, A.; Lee, J.; Lenzi, T.; Litov, L.; Loddo, F.; Maerschalk, T.; Magazzu, G.; Maggi, M.; Maghrbi, Y.; Magnani, A.; Majumdar, N.; Mal, P.K.; Mandal, K.; Marchioro, A.; Marinov, A.; Merlin, J.A.; Mohanty, A.K.; Mohapatra, A.; Muhammad, S.; Mukhopadhyay, S.; Naimuddin, M.; Nuzzo, S.; Oliveri, E.; Pant, L.M.; Paolucci, P.; Park, I.; Passeggio, G.; Pavlov, B.; Philipps, B.; Phipps, M.; Piccolo, D.; Postema, H.; Pugliese, G.; Baranac, A.Puig; Radi, A.; Radogna, R.; Raffone, G.; Ramkrishna, S.; Ranieri, A.; Riccardi, C.; Rodrigues, A.; Ropelewski, L.; RoyChowdhury, S.; Ryu, M.S.; Ryu, G.; Safonov, A.; Sakharov, A.; Salva, S.; Saviano, G.; Sharma, A.; Swain, S.K.; Talvitie, J.P.; Tamma, C.; Tatarinov, A.; Turini, N.; Tuuva, T.; Twigger, J.; Tytgat, M.; Vai, I.; van Stenis, M.; Venditi, R.; Verhagen, E.; Verwilligen, P.; Vitulo, P.; Wang, D.; Wang, M.; Yang, U.; Yang, Y.; Yonamine, R.; Zaganidis, N.; Zenoni, F.; Zhang, A.

    2016-03-14

    Gas Electron Multiplier (GEM) technology is being considered for the forward muon upgrade of the CMS experiment in Phase 2 of the CERN LHC. Its first implementation is planned for the GE1/1 system in the $1.5 < \\mid\\eta\\mid < 2.2$ region of the muon endcap mainly to control muon level-1 trigger rates after the second long LHC shutdown. A GE1/1 triple-GEM detector is read out by 3,072 radial strips with 455 $\\mu$rad pitch arranged in eight $\\eta$-sectors. We assembled a full-size GE1/1 prototype of 1m length at Florida Tech and tested it in 20-120 GeV hadron beams at Fermilab using Ar/CO$_{2}$ 70:30 and the RD51 scalable readout system. Four small GEM detectors with 2-D readout and an average measured azimuthal resolution of 36 $\\mu$rad provided precise reference tracks. Construction of this largest GEM detector built to-date is described. Strip cluster parameters, detection efficiency, and spatial resolution are studied with position and high voltage scans. The plateau detection efficiency is [97.1 $\\pm...

  9. Bunched beam test of the CMS drift tubes local muon trigger

    CERN Document Server

    Arce, P; Benettoni, M; Benvenuti, A C; Bonacorsi, D; Bontenackels, M; Caballero, J; Cafaro, V; Capiluppi, P; Castellani, L; Cavallo, F R; Cerrada, M; Checchia, P; Colino, N; Conti, E; Corvo, M; de la Cruz, B; Dal Corso, F; Dallavalle, G M; De Giorgi, M; Fabbri, F; Fanfani, A; Fernández, C; Fernández de Troconiz, J; Fouz-Iglesias, M C; García-Abia, P; Gasparini, F; Gasparini, U; Giacomelli, P; Giordano, V; Gonella, F; Grandi, C; Guiducci, L; Gulmini, M; Hebbeker, T; Hernández, J M; Höpfner, K; Josa-Mutuberria, I; Lacaprara, S; Lippi, I; Mameghani, R; Marcellini, S; Maron, G; Martinelli, R; Maselli, S; Masetti, G; Meneguzzo, Anna Teresa; Meng, G; Monaco, V; Montanari, A; Montecassiano, F; Navarria, Francesco Luigi; Odorici, F; Passaseo, M; Pegoraro, M; Peroni, C; Perrotta, A; Ponte-Sancho, A J; Puerta, J; Reithler, H; Romero, A; Romero, L; Ronchese, P; Rossi, A; Rovelli, T; Sacchi, R; Staiano, A; Toniolo, N; Torassa, E; Torromeo, G; Travaglini, R; Vanini, S; Ventura, L; Ventura, Sandro; Villanueva, C; Willmott, C; Zanetti, M; Zangrando, L; Zotto, P L; Zumerle, G

    2004-01-01

    The 40 MHz bunched muon beam set up at CERN was used in May 2003 to make a full test of the drift tubes local muon trigger. The main goal of the test was to prove that the integration of the various devices located on a muon chamber was adequately done both on the hardware and software side of the system. Furthermore the test provided complete information about the general performance of the trigger algorithms in terms of efficiency and noise. Data were collected with the default configuration of the trigger devices and with several alternative configurations at various angles of incidence of the beam. Tests on noise suppression and di-muon trigger capability were performed.

  10. The CMS Discovery Potential of Supersymmetry within mSugra with two same sign muons

    CERN Document Server

    Acosta, D; Mitselmakher, G

    2005-01-01

    A detailed study of the same-sign muon signature within the mSUGRA model was performed. Selection criteria based on the missing transverse energy in the events and the jet and muon transverse momenta are applied to select the data sample. An excess of SUSY events over the standard model background processes can be statistically significant for many benchmark points for an integrated luminosity of less than 10 fb/sup -1detailed detector simulation, trigger emulation and reconstruction were performed.

  11. Down with Physics: giant compact muon solenoid (CMS) magnet goes underground at CERN UCR physicists to participate in the international experiment

    CERN Multimedia

    2007-01-01

    "Scientists of the US CMS collaboration, which includes UC riverside physicists, joined colleagues around the world in announcing today that the heaviest piece of the Compact Muon Solenoid particle detector has begun te momentous journey into its experimenta cavern 100 meters underground." (2,5 pages)

  12. 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 (...

  13. Upgrade of the CMS muon trigger system in the barrel region

    CERN Document Server

    Battilana, Carlo; Codispoti, Giuseppe; Dallavalle, Gaetano-Marco; Ero, Janos; Flouris, Giannis; Fountas, Konstantinos; Fulcher, Jonathan Richard; Guiducci, Luigi; Loukas, Nikitas; Mallios, Stavros; Manthos, Nikolaos; Papadopoulos, Ioannis; Paradas, Evangelos; Rabady, Dinyar Sebastian; Reis, Thomas; Sakulin, Hannes; Sphicas, Paraskevas; Triossi, Andrea; Venturi, Andrea; Wulz, Claudia

    2016-01-01

    To maintain the excellent performance of the LHC during its Run-1 also in Run-2, the Level-1 Trigger of the Compact Muon Solenoid experiment underwent a significant upgrade. One part of this upgrade was the re-organisation of the muon trigger path from a subsystem-centric view in which hits in the drift tubes, the cathode strip chambers, and the resistive plate chambers were treated separately in dedicated track-finding systems, to one in which complementary detector systems for a given region (barrel, overlap, and endcap) are merged already at the track-finding level. This also required the development of a new system to sort as well as cancel-out the muon tracks found by each system. An overview will be given of the new track-finder system for the barrel region, the Barrel Muon Track Finder (BMTF) as well as the cancel-out and sorting layer, the upgraded Global Muon Trigger ($\\mu$GMT). While the BMTF improves on the proven and well-tested algorithms used in the Drift Tube Track Finder during Run-1, the $\\m...

  14. Commissioning and Performance of the CMS Pixel Tracker with Cosmic Ray Muons

    CERN Document Server

    INSPIRE-00165402; Abadjiev, K; Abbaneo, D; Abbiendi, G; Abbrescia, M; Abdullin, S; Abelev, B; Acosta, D; Acosta, J G; Actis, O; Adam, N; Adams, M R; Adams, T; Adam, W; Adiguzel, A; Adler, V; Adolphi, R; Adzic, P; Afaq, M A; Agostino, L; Agram, J L; Aguilar-Benitez, M; Ahmad, M; Ahmed, I; Ahmed, W; Ahuja, S; Aisa, D; Aisa, S; Akchurin, N; Akgun, B; Akgun, U; Akimenko, S; Akin, I V; Alagoz, E; Alampi, G; Albajar, C; Albayrak, E A; Alberdi, J; Albergo, S; Albert, E; Albrow, M; Alcaraz Maestre, J; Aldaya Martin, M; Alexander, J; Alidra, M; Aliev, T; Allfrey, P; Almeida, N; Altenhöfer, G; Altsybeev, I; Alver, B; Alverson, G; Alves, G A; Amaglobeli, N; Amapane, N; Ambroglini, F; Amsler, C; Anagnostou, G; Ananthan, B; Anastassov, A; Andelin, D; Anderson, M; Andrea, J; Andreev, V; Andreev, Yu; Anghel, I M; Anguelov, T; Anisimov, A; Antillon, E; Antipov, P; Antonelli, L; Anttila, E; Antunes Pedro, L; Antunovic, Z; Apanasevich, L; Apollinari, G; Apresyan, A; Arce, P; Arcidiacono, R; Arenton, M W; Arfaei, H; Argiro, S; Arisaka, K; Arneodo, M; Arnold, B; Arora, S; Artamonov, A; Asaadi, J; Asghar, M I; Ashby, S; Askew, A; Atac, M; Atramentov, O; Auffray, E; Aurisano, A; Autermann, C; Avery, P; Avetisyan, A; Avila, C; Awan, M I M; Ayan, A S; Ayhan, A; Azhgirey, I; Aziz, T; Azman Gokce, A; Azzi, P; Azzurri, P; Baarmand, M M; Babb, J; Babucci, E; Baccaro, S; Bacchetta, N; Bacchi, W; Bachtis, M; Baden, D; Badgett, W; Baechler, J; Baer, H; Baesso, P; Baffioni, S; Bagby, L; Bagliesi, G; Bahk, S Y; Bailleux, D; Baillon, P; Bainbridge, R; Bakhshiansohi, H; Bakirci, M N; Bakken, J A; Balazs, M; Baldin, B; Ball, A H; Ball, G; Ballin, J; Bally, S L; Bandurin, D; Banerjee, S; Banerjee, S; Banicz, K; Bansal, S; Ban, Y; Banzuzi, K; Baquero Ruiz, M; Barashko, V; Barbagli, G; Barberis, E; Barbone, L; Barcala, J M; Barcellan, L; Bard, R; Bargassa, P; Baringer, P; Barnes, V E; Barnett, B A; Barney, D; Barone, L; Bartalini, P; Bartoloni, A; Bartz, E; Basegmez, S; Battilana, C; Baty, C; Baud, A; Bauerdick, L A T; Bauer, G; Bauer, J; Baur, U; Bawa, H S; Bazterra, V E; Bean, A; Beauceron, S; Beaudette, F; Beaumont, W; Bechtel, F; Bedjidian, M; Beetz, C P; Behrens, U; Belforte, S; Beliy, N; Bellan, P; Bellan, R; Bellato, M; Bellinger, J N; Bell, K W; Belotelov, I; Benaglia, A; Bencze, G; Bendavid, J; Bender, W; Benedetti, D; Benelli, G; Benettoni, M; Beni, N; Benucci, L; Benussi, L; Benvenuti, A C; Beretvas, A; Bergauer, H; Bergauer, T; Beri, S B; Bernardini, J; Bernardino Rodrigues, N; Bernet, C; Berntzon, L; Berretta, L; Berry, D; Berry, E; Berryhill, J; Bertani, M; Bertl, W; Bertoldi, M; Berzano, U; Besancon, M; Besson, A; Betchart, B; Betev, B; Betts, R R; Beuselinck, R; Bhatnagar, V; Bhat, P C; Bhattacharya, S; Bhattacharya, S; Bhatti, A; Biallass, P; Bianchini, L; Bianco, S; Biasini, M; Biasotto, M; Biery, K; Biino, C; Bilei, G M; Bilki, B; Bilmis, S; Binkley, M; Bisello, D; Bitioukov, S; Blaha, J; Blanco Otano, M; Blekman, F; Bloch, D; Bloch, I; Bloch, P; Bloom, K; Bluj, M; Blumenfeld, B; Blüm, P; Blyweert, S; Boccali, T; Bocci, A; Bockelman, B; Bodek, A; Bodin, D; Boeriu, O; Boldini, M; Boldizsar, L; Bolla, G; Bolognesi, S; Bolton, T; Bonacorsi, D; Bona, M; Bonato, A; Bondar, N; Bonnett Del Alamo, M; Bontenackels, M; Boos, E; Borcherding, F; Borgia, M A; Bornheim, A; Borras, K; Borrello, L; Borsato, E; Bortoletto, D; Bose, M; Bose, S; Bose, T; Bosi, F; Bos, J; Bostock, F; Botta, C; Boudoul, G; Bouhali, O; Bourgeois, N; Bourilkov, D; Bourrel, T; Boutemeur, M; Boutle, S; Braibant-Giacomelli, S; Branca, A; Branson, J G; Brauer, R; Braunschweig, W; Breedon, R; Brett, A M; Breuker, H; Brew, C; Bricola, S; Briggs, R; Brigljevic, V; Broccolo, G; Brom, J M; Brooke, J J; Brown, R M; Brun, H; Bruno, G; Buchmuller, O; Budd, H; Buege, V; Buehler, M; Bunin, P; Bunkowski, K; Bunn, J; Buontempo, S; Burgos Lazaro, C; Burkett, K; Burtovoy, V; Busson, P; Busza, W; Butler, J N; Butler, P H; Butt, J; Butz, E; Bylsma, B; Caballero Bejar, J; Cabrillo, I J; Cafaro, V D; Caiazza, S S; Cai, J; Cakir, A; 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    2010-01-01

    The pixel detector of the Compact Muon Solenoid experiment consists of three barrel layers and two disks for each endcap. The detector was installed in summer 2008, commissioned with charge injections, and operated in the 3.8 T magnetic field during cosmic ray data taking. This paper reports on the first running experience and presents results on the pixel tracker performance, which are found to be in line with the design specifications of this detector. The transverse impact parameter resolution measured in a sample of high momentum muons is 18 microns.

  15. Commissioning and Performance of the CMS Pixel Tracker with Cosmic Ray Muons

    CERN Document Server

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Wright, D; Wrochna, G; Wulz, C E; Würthwein, F; Wu, S; Wu, W; Wyslouch, B; Xie, S; Xie, Z; Xue, Z; Yagil, A; Yang, X; Yang, Y; Yang, Z C; Yan, M; Yarba, J; Yaselli, I; Yazgan, E; Yelton, J; Yetkin, T; Yi, K; Yilmaz, Y; Yohay, R; Yoo, H D; Yoon, A S; York, A; Yumiceva, F; Yun, J C; Yuste, C; Zabi, A; Zabolotny, W; Zachariadou, A; Zalewski, P; Zampieri, A; Zanetti, M; Zang, S L; Zarubin, A; Zatzerklyany, A; Zeidler, C; Zeinali, M; Zeise, M; Zelepoukine, S; Zeuner, W D; Zeyrek, M; Zhang, J; Zhang, L; Zhang, Y; Zhang, Z; Zheng, Y; Zhiltsov, V; Zhokin, A; Zhu, B; Zhukova, V; Zhukov, V; Zhu, K; Zhu, R Y; Ziebarth, E B; Zielinski, M; Zilizi, G; Zinonos, Z; Zito, G; Zoeller, M H; Zotto, P; Zub, S; Zumerle, G; Zuranski, A; Zuyeuski, R; Zych, P

    2010-01-01

    The pixel detector of the Compact Muon Solenoid experiment consists of three barrel layers and two disks for each endcap. The detector was installed in summer 2008, commissioned with charge injections, and operated in the 3.8 T magnetic field during cosmic ray data taking. This paper reports on the first running experience and presents results on the pixel tracker performance, which are found to be in line with the design specifications of this detector. The transverse impact parameter resolution measured in a sample of high momentum muons is 18 microns.

  16. New micropattern gas detectors for the endcap muon system of the CMS experiment at the high-luminosity LHC

    CERN Document Server

    Calabria, Cesare

    2016-01-01

    For the era of the high-luminosity LHC, new detectors are planned to enhance the performance of the endcap muon system of the CMS detector. We report on two types of these detectors that will be installed during the third long shutdown (LS3) of the LHC. In the pseudo-rapidity region $1.6 < \\lvert\\eta\\rvert < 2.4$, new triple-foil large-area Gaseous Electron Multiplier (GEM) detectors will be installed in the third of five detector stations in each endcap, the first station being closest to the interaction point. These GEM detectors are in addition to ones that will have already been installed in the second station during LS2. We present a design for the third station detectors that must cover a larger geometrical area than those in the second station, while maintaining good performance for efficiency and spatial resolution. A new innermost (first) detector station will be installed in the endcaps to extend the range of muon identification up to about $ \\lvert\\eta\\rvert = 3.0$. We describe the geometric...

  17. New micropattern gas detectors for the endcap muon system of the CMS experiment at the high-luminosity LHC

    CERN Document Server

    Calabria, Cesare

    2016-01-01

    For the era of the high-luminosity LHC, new detectors are planned to enhance the performance of the endcap muon system of the CMS detector. We report on two types of these detectors that will be installed during the third long shutdown (LS3) of the LHC. In the pseudo-rapidity region $1.6 < \\lvert\\eta\\rvert < 2.4$, new triple-foil large-area Gaseous Electron Multiplier (GEM) detectors will be installed in the third of five detector stations in each endcap, the first station being closest to the interaction point. These GEM detectors are in addition to ones that will have already been installed in the second station during LS2. We present a design for the third station detectors that must cover a larger geometrical area than those in the second station, while maintaining good performance for efficiency and spatial resolution. A new innermost (first) detector station will be installed in the endcaps to extend the range of muon identification up to about $ \\lvert\\eta\\rvert = 3.0$. We describe the geometric...

  18. A search for beyond the Standard Model physics using a final state with light and boosted muon pairs at the CMS experiment

    Science.gov (United States)

    Castaneda, A.; CMS Collaboration

    2017-07-01

    A search for physics beyond the Standard Model (SM) is performed using a final state with multi-muons and collision data collected by the Compact Muon Solenoid (CMS) experiment at the CERN Large Hadron Collider (LHC). The topology under study considers events with pairs of oppositely charged muons (dimuons) with a low invariant mass and a common origin. This selection offers an extremely low contribution from SM processes and fits into several beyond the SM signatures. Results are interpreted in a model-independent fashion and in the context of two scenarios: Supersymmetry including “dark” sectors (dark-SUSY) and Next-to-Minimal Supersymmetric Standard Model (NMSSM). Both scenarios postulate a non-SM decay of the Higgs boson to a pair of new light bosons which subsequently decay to a pair of muons. In the case of the dark-SUSY scenario, the hypothetical production of dark photons could give an insight on the origin of dark matter.

  19. Measurements of the differential cross section and charge asymmetry for inclusive pp →W (muupsilon) production with 8 TeV CMS data and CMS single muon trigger efficiency study

    Science.gov (United States)

    Ogul, Hasan

    This dissertation presents muon charge asymmetry, fiducial differential cross section and CMS single muon trigger efficiency measurements as a function of muon pseudorapidity for inclusive W→muupsilon events produced in proton-proton collisions at the LHC. The data were recorded by the CMS detector at a center-of-mass energy of 8 TeV and correspond to an integrated luminosity of 18.8 fb-1. Several comparisons are performed to cross-check the experimental results. Muon efficiency measurements are compared to estimated values from Monte Carlo simulations and reference values recommended by CMS physics object groups. The differential cross section and the charge asymmetry measurements are compared to theoretical predictions based on next-to-leading order and next-to-next-to-leading order QCD calculations with different PDF models. Inputs from the charge asymmetry and the differential cross section measurements for the determination of the next generation of PDF sets are expected to bring different predictions closer together and aid in reducing PDF uncertainties. The impact of the charge asymmetry on PDFs has been investigated by putting the asymmetry results into a QCD analysis at next-to-leading order and next-to-nextleading order with inclusive deep-inelastic scattering data from HERA. Significant improvement of the accuracy on the valence-quark distributions is observed. This measurement is recommended for more accurate constraints in future PDF determinations. More precise measurements of PDFs will improve LHC predictions.

  20. 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.

  1. Operation and performance of the CMS Resistive Plate Chambers during LHC run II

    CERN Document Server

    Eysermans, Jan

    2017-01-01

    The Resitive Plate Chambers (RPC) at the Compact Muon Solenoid (CMS) experiment at the CERN Large Hadron Collider (LHC) provide redundancy to the Drift Tubes in the barrel and Cathode Strip Chambers in the endcap regions. Consisting of 1056 double gap RPC chambers, the main detector parameters and environmental conditions are carefully monitored during the data taking period. At a center of mass energy of 13 TeV, the luminosity reached record levels which was challenging from the operational and performance point of view. In this work, the main operational parameters are discussed and the overall performance of the RPC system is reported for the LHC run II data taking period. With a low amount of inactive chambers, a good and stable detector performance was achieved with high efficiency.

  2. Performance of the CMS Hadron Calorimeter with Cosmic Ray Muons and LHC Beam Data

    CERN Document Server

    INSPIRE-00165402; Khachatryan, V; 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; 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; 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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; 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    2010-01-01

    The CMS Hadron Calorimeter in the barrel, endcap and forward regions is fully commissioned. Cosmic ray data were taken with and without magnetic field at the surface hall and after installation in the experimental hall, hundred meters underground. Various measurements were also performed during the few days of beam in the LHC in September 2008. Calibration parameters were extracted, and the energy response of the HCAL determined from test beam data has been checked.

  3. Performance of the CMS Hadron Calorimeter with Cosmic Ray Muons and LHC Beam Data

    CERN Document Server

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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 Hadron Calorimeter in the barrel, endcap and forward regions is fully commissioned. Cosmic ray data were taken with and without magnetic field at the surface hall and after installation in the experimental hall, hundred meters underground. Various measurements were also performed during the few days of beam in the LHC in September 2008. Calibration parameters were extracted, and the energy response of the HCAL determined from test beam data has been checked.

  4. ATLAS RPC Quality Assurance results at INFN Lecce

    CERN Document Server

    INSPIRE-00211509; Borjanovic, I.; Cataldi, G.; Cazzato, A.; Chiodini, G.; Coluccia, M. R.; Creti, P.; Gorini, E.; Grancagnolo, F.; Perrino, R.; Primavera, M.; Spagnolo, S.; Tassielli, G.; Ventura, A.

    2006-01-01

    The main results of the quality assurance tests performed on the Resistive Plate Chamber used by the ATLAS experiment at LHC as muon trigger chambers are reported and discussed. Since July 2004, about 270 RPC units has been certified at INFN Lecce site and delivered to CERN, for being integrated in the final muon station of the ATLAS barrel region. We show the key RPC characteristics which qualify the performance of this detector technology as muon trigger chamber in the harsh LHC enviroments. These are dark current, chamber efficiency, noise rate, gas volume tomography, and gas leakage.

  5. Performance Analysis of a Bunch and Track Identifier Prototype (BTI) for the CMS Barrel Muon Drift Chambers; Estudio de las Prestaciones de un Prototipo de Bunch and Track Identifier (BTI) para las Camaras de Deriva de CMS

    Energy Technology Data Exchange (ETDEWEB)

    Puerta Pelayo, J.

    2001-07-01

    This note contains a short description of the first step in the first level trigger applied to the barrel muon drift chambers of CMS: the Bunch and Track Identifier (BTI). The test beam results obtained with a BTI prototype have been also analysed BTI performance for different incidence angles and in presence of external magnetic field has been tested, as well as BTI capability as trigger device and track reconstructor. (Author) 30 refs.

  6. GEM Performance Studies in CMS Experiment with Four Muons Final State

    CERN Document Server

    AUTHOR|(INSPIRE)INSPIRE-00572310; Abdelalim, Ahmed Ali; Assran, Yasser; Yasein, Mohamed Nabil; Yasein, Mohamed Nabil; Abdelalim, Ahmed Ali; Assran, Yasser

    The standard model (SM) of particle physics, although it is a very successful theory and compatible with all experimental results, it has a number of shortcomings, in particular it provides no answer for the three generations of fermions. Compositeness models try to solve this problem by postulating that quarks and leptons might be composite objects of fundamental particles. Due to their substructure, these models predict the existence of excited states of SM particles, in particular excited quarks $q^*$ and excited leptons $l^*$. In the first part of the thesis we present a phenomenological study of excited muons $\\mu^*$ at center of mass energy $\\sqrt{s}$ = 14 TeV and integrated luminosity of $300fb^{-1}$ respectively. These excited muons are produced via contact interactions at an energy scale $\\Lambda$ either singly in conjunction with a SM particle or in pairs. The considered channel here is the single production, in particular the decay channel $pp \\rightarrow \\mu \\mu^* \\rightarrow \\mu \\mu Z$, with the ...

  7. CMS Higgs Search in 2011 and 2012 data: candidate ZZ event (8 TeV) with two electrons and two muons

    CERN Multimedia

    McCauley, T

    2012-01-01

    Event recorded with the CMS detector in 2012 at a proton-proton centre of mass energy of 8 TeV. The event shows characteristics expected from the decay of the SM Higgs boson to a pair of Z bosons, one of which subsequently decays to a pair of electrons (green lines and green towers) and the other Z decays to a pair of muons (red lines). The event could also be due to known standard model background processes.

  8. 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.

  9. Test beam results of the GE1/1 prototype for a future upgrade of the CMS high-$\\eta$ muon system

    CERN Document Server

    Abbaneo, D; Armagnaud, C; Aspell, P; Ban, Y; Bally, S; Benussi, L; Berzano, U; Bianco, S; Bos, J; Bunkowski, K; Cai, J; Chatelain, J P; Christiansen, J; Colafranceschi, S; Colaleo, A; Conde Garcia, A; David, E; de Robertis, G; De Oliveira, R; Duarte Pinto, S; Ferry, S; Formenti, F; Franconi, L; Gnanvo, K; Gutierrez, A; Hohlmann, M; Karchin, P E; Loddo, F; Magazzú, G; Maggi, M; Marchioro, A; Marinov, A; Mehta, K; Merlin, J; Mohapatra, A; Moulik, T; Nemallapudi, M V; Nuzzo, S; Oliveri, E; Piccolo, D; Postema, H; Raffone, G; Rodrigues, A; Ropelewski, L; Saviano, G; Sharma, A; Staib, M J; Teng, H; Tytgat, M; Tupputi, S A; Turini, N; Smilkjovic, N; Villa, M; Zaganidis, N; Zientek, M

    2011-01-01

    Gas Electron Multipliers (GEM) are an interesting technology under consideration for the future upgrade of the forward region of the CMS muon system, specifically in the $1.6<| \\eta |<2.4$ endcap region. With a sufficiently fine segmentation GEMs can provide precision tracking as well as fast trigger information. The main objective is to contribute to the improvement of the CMS muon trigger. The construction of large-area GEM detectors is challenging both from the technological and production aspects. In view of the CMS upgrade we have designed and built the largest full-size Triple-GEM muon detector, which is able to meet the stringent requirements given the hostile environment at the high-luminosity LHC. Measurements were performed during several test beam campaigns at the CERN SPS in 2010 and 2011. The main issues under study are efficiency, spatial resolution and timing performance with different inter-electrode gap configurations and gas mixtures. In this paper results of the performance of the pro...

  10. A search for beyond the Standard Model physics using a final state with light and boosted muon pairs at CMS experiment

    CERN Document Server

    Castaneda Hernandez, Alfredo Martin

    2017-01-01

    A search for new physics phenomena is presented using a final state with multi-muons, the topology studied considers pairs of opposite sign muons (dimuons) with a low invariant mass and potentially produced far from the interaction point (displaced). Several beyond the Standard Model scenarios fit into this category, including those predicting Dark matter particles (i.e. dark photons) which weakly interact with SM particles via a kinetic mixing parameter and could have a non-negligible lifetime. Other scenario is the Next-to-Minimal Supersymmetric Standard Model (NMSSM) that extends the higgs sector introducing new light bosons that can decay to muon pairs. The data analyzed corresponds to the one collected by CMS experiment during 2015 using 13 TeV collision energy. This search constrains a large, previously unconstrained area of the parameter space for each mode and allows for an easy reinterpretation for new physics models with similar final state.

  11. 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...

  12. Results of radiation test of the cathode front-end board for CMS endcap muon chambers

    Science.gov (United States)

    Breedon, R.; Bylsma, B.; Durkin, L. S.; Gilmore, J.; Gu, J.; Hauser, J.; Holbrook, B.; Kim, C. L.; Ling, T. Y.; von der Mey, M.; Murray, P.; Rush, C. J.; Santiard, J. C.; Tripathi, M.

    2001-10-01

    After a brief overview of the CMS EMU electronics system, results on radiation induced single event effects, total ionization dose and displacement effects will be reported. These results are obtained by irradiating the components on electronics boards with 63 MeV protons and 1 MeV neutrons. During the proton irradiation, the electronics board was fully under power, all components on the board were active and the data were read out in the same way as designed for CMS. No deterioration of analog performance for each of the three CMOS ASICs on the tested board was observed, up to a dose of 10 krad. Each of the tested FPGAs survived beyond the dose of 30 krad. No single event latch-up was detected for the CMOS ASICs up to a proton fluence of 2×10 12 cm-2. Single Event Upsets (SEU) in FPGAs were detected and their cross-sections measured. SEU mitigation with triple module redundancy and voting was implemented and tested.

  13. Results of radiation test of the cathode front-end board for CMS endcap muon chambers

    CERN Document Server

    Breedon, R; Durkin, L S; Gilmore, J; Gu, J; Hauser, J; Holbrook, B; Kim, C L; Ling, T; Mey, M; Murray, P; Rush, C J; Santiard, Jean-Claude; Tripathi, M

    2001-01-01

    After a brief overview of the CMS EMU electronics system, results on radiation induced single event effects, total ionization dose and displacement effects will be reported. These results are obtained by irradiating the components on electronics boards with 63 MeV protons and 1 MeV neutrons. During the proton irradiation, the electronics board was fully under power, all components on the board were active and the data were read out in the same way as designed for CMS. No deterioration of analog performance for each of the three CMOS ASICs on the tested board was observed, up to a dose of 10 krad. Each of the tested FPGAs survived beyond the dose of 30 krad. No single event latch-up was detected for the CMOS ASICs up to a proton fluence of 2x10 sup 1 sup 2 cm sup - sup 2. Single Event Upsets (SEU) in FPGAs were detected and their cross-sections measured. SEU mitigation with triple module redundancy and voting was implemented and tested.

  14. Measurements of the drift velocity using a s