M. Abbrescia - on behalf of CMS RPC collaboration

M. Abbrescia
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M. Abbrescia
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on behalf of CMS RPC collaboration
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Physics - Instrumentation and Detectors (24)
 
High Energy Physics - Experiment (16)
 
High Energy Physics - Phenomenology (1)
 
High Energy Astrophysical Phenomena (1)
 
Instrumentation and Methods for Astrophysics (1)

Publications Authored By M. Abbrescia

The Extreme Energy Events Project is a synchronous sparse array of 52 tracking detectors for studying High Energy Cosmic Rays (HECR) and Cosmic Rays-related phenomena. The observatory is also meant to address Long Distance Correlation (LDC) phenomena: the network is deployed over a broad area covering 10 degrees in latitude and 11 in longitude. An overview of a set of preliminary results is given, extending from the study of local muon flux dependance on solar activity to the investigation of the upward-going component of muon flux traversing the EEE stations; from the search for anisotropies at the sub-TeV scale to the hints for observations of km-scale Extensive Air Shower (EAS). Read More

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. Read More

2016Jun
Authors: F. Lagarde1, M. Gouzevitch2, I. Laktineh3, V. Buridon4, X. Chen5, C. Combaret6, A. Eynard7, L. Germani8, G. Grenier9, H. Mathez10, L. Mirabito11, A. Petrukhin12, A. Steen13, W. Tromeuraa14, Y. Wang15, A. Gongab16, N. Moreau17, C. de la Taille18, F. Dulucqac19, A. Cimmino20, S. Crucy21, A. Fagot22, M. Gul23, A. A. O. Rios24, M. Tytgat25, N. Zaganidisb26, S. Aly27, Y. Assran28, A. Radi29, A. Sayedc30, G. Singhd31, M. Abbrescia32, G. Iaselli33, M. Maggi34, G. Pugliese35, P. Verwilligene36, W. Van Doninck37, S. Colafranceschi38, A. Sharmag39, L. Benussi40, S. Bianco41, D. Piccolo42, F. Primaverah43, V. Bhatnagar44, R. Kumari45, A. Mehta46, J. Singhi47, A. Ahmad48, W. Ahmed49, H. M. I. Asghar50, I. M. Awan51, R. Hoorani52, S. Muhammad53, H. Shahzad54, M. A. Shah55, S. W. Cho56, S. Y. Choi57, B. Hong58, M. H. Kang59, K. S. Lee60, J. H. Lim61, S. K. Parkk62, M. S. Kiml63, S. Carpinteyro Bernardino64, I. Pedraza65, C. Uribe Estradam66, S. Carrillo Moreno67, F. Vazquez Valencian68, L. M. Panto69, S. Buontempo70, N. Cavallo71, M. Esposito72, F. Fabozzi73, G. Lanza74, I. Orso75, L. Lista76, S. Meola77, M. Merola78, P. Paolucci79, F. Thyssen80, A. Braghieri81, A. Magnani82, P. Montagna83, C. Riccardi84, P. Salvini85, I. Vai86, P. Vituloq87, Y. Ban88, S. J. Qianr89, M. Choi90, Y. Choi91, J. Goh92, D. Kimt93, A. Aleksandrov94, R. Hadjiiska95, P. Iaydjiev96, M. Rodozov97, S. Stoykova98, G. Sultanov99, M. Vutovau100, A. Dimitrov101, L. Litov102, B. Pavlov103, P. Petkovv104, I. Bagaturia105, D. Lomidzew106, C. Avila107, A. Cabrera108, J. C. Sanabria109, I. Crottyy110, J. Vaitkusz111
Affiliations: 1on behalf of CMS RPC collaboration, 2on behalf of CMS RPC collaboration, 3on behalf of CMS RPC collaboration, 4on behalf of CMS RPC collaboration, 5on behalf of CMS RPC collaboration, 6on behalf of CMS RPC collaboration, 7on behalf of CMS RPC collaboration, 8on behalf of CMS RPC collaboration, 9on behalf of CMS RPC collaboration, 10on behalf of CMS RPC collaboration, 11on behalf of CMS RPC collaboration, 12on behalf of CMS RPC collaboration, 13on behalf of CMS RPC collaboration, 14on behalf of CMS RPC collaboration, 15on behalf of CMS RPC collaboration, 16on behalf of CMS RPC collaboration, 17on behalf of CMS RPC collaboration, 18on behalf of CMS RPC collaboration, 19on behalf of CMS RPC collaboration, 20on behalf of CMS RPC collaboration, 21on behalf of CMS RPC collaboration, 22on behalf of CMS RPC collaboration, 23on behalf of CMS RPC collaboration, 24on behalf of CMS RPC collaboration, 25on behalf of CMS RPC collaboration, 26on behalf of CMS RPC collaboration, 27on behalf of CMS RPC collaboration, 28on behalf of CMS RPC collaboration, 29on behalf of CMS RPC collaboration, 30on behalf of CMS RPC collaboration, 31on behalf of CMS RPC collaboration, 32on behalf of CMS RPC collaboration, 33on behalf of CMS RPC collaboration, 34on behalf of CMS RPC collaboration, 35on behalf of CMS RPC collaboration, 36on behalf of CMS RPC collaboration, 37on behalf of CMS RPC collaboration, 38on behalf of CMS RPC collaboration, 39on behalf of CMS RPC collaboration, 40on behalf of CMS RPC collaboration, 41on behalf of CMS RPC collaboration, 42on behalf of CMS RPC collaboration, 43on behalf of CMS RPC collaboration, 44on behalf of CMS RPC collaboration, 45on behalf of CMS RPC collaboration, 46on behalf of CMS RPC collaboration, 47on behalf of CMS RPC collaboration, 48on behalf of CMS RPC collaboration, 49on behalf of CMS RPC collaboration, 50on behalf of CMS RPC collaboration, 51on behalf of CMS RPC collaboration, 52on behalf of CMS RPC collaboration, 53on behalf of CMS RPC collaboration, 54on behalf of CMS RPC collaboration, 55on behalf of CMS RPC collaboration, 56on behalf of CMS RPC collaboration, 57on behalf of CMS RPC collaboration, 58on behalf of CMS RPC collaboration, 59on behalf of CMS RPC collaboration, 60on behalf of CMS RPC collaboration, 61on behalf of CMS RPC collaboration, 62on behalf of CMS RPC collaboration, 63on behalf of CMS RPC collaboration, 64on behalf of CMS RPC collaboration, 65on behalf of CMS RPC collaboration, 66on behalf of CMS RPC collaboration, 67on behalf of CMS RPC collaboration, 68on behalf of CMS RPC collaboration, 69on behalf of CMS RPC collaboration, 70on behalf of CMS RPC collaboration, 71on behalf of CMS RPC collaboration, 72on behalf of CMS RPC collaboration, 73on behalf of CMS RPC collaboration, 74on behalf of CMS RPC collaboration, 75on behalf of CMS RPC collaboration, 76on behalf of CMS RPC collaboration, 77on behalf of CMS RPC collaboration, 78on behalf of CMS RPC collaboration, 79on behalf of CMS RPC collaboration, 80on behalf of CMS RPC collaboration, 81on behalf of CMS RPC collaboration, 82on behalf of CMS RPC collaboration, 83on behalf of CMS RPC collaboration, 84on behalf of CMS RPC collaboration, 85on behalf of CMS RPC collaboration, 86on behalf of CMS RPC collaboration, 87on behalf of CMS RPC collaboration, 88on behalf of CMS RPC collaboration, 89on behalf of CMS RPC collaboration, 90on behalf of CMS RPC collaboration, 91on behalf of CMS RPC collaboration, 92on behalf of CMS RPC collaboration, 93on behalf of CMS RPC collaboration, 94on behalf of CMS RPC collaboration, 95on behalf of CMS RPC collaboration, 96on behalf of CMS RPC collaboration, 97on behalf of CMS RPC collaboration, 98on behalf of CMS RPC collaboration, 99on behalf of CMS RPC collaboration, 100on behalf of CMS RPC collaboration, 101on behalf of CMS RPC collaboration, 102on behalf of CMS RPC collaboration, 103on behalf of CMS RPC collaboration, 104on behalf of CMS RPC collaboration, 105on behalf of CMS RPC collaboration, 106on behalf of CMS RPC collaboration, 107on behalf of CMS RPC collaboration, 108on behalf of CMS RPC collaboration, 109on behalf of CMS RPC collaboration, 110on behalf of CMS RPC collaboration, 111on behalf of CMS RPC collaboration

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 $6.10^{34} cm^{-2} s^{-1}$ . Read More

The operations of Resistive Plate Chambers in LHC experiments require Fluorine based (F-based) gases for optimal performance. Recent European regulations demand the use of environmentally unfriendly F-based gases to be limited or banned. In view of the CMS experiment upgrade, several tests are ongoing to measure the performance of the detector with these new ecological gas mixtures, in terms of efficiency, streamer probability, induced charge and time resolution. Read More

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 its central and forward regions). All three are used for muon reconstruction and triggering. During the first long shutdown (LS1) of the LHC (2013-2014) the CMS muon system has been upgraded with 144 newly installed RPCs on the forth forward stations. Read More

Due to the recent restrictions deriving from the application of the Kyoto protocol, the main components of the gas mixtures presently used in the Resistive Plate Chambers systems of the LHC experiments will be most probably phased out of production in the coming years. Identifying possible replacements with the adequate characteristics requires an intense R&D, which was recently started, also in collaborations across the various experiments. Possible candidates have been proposed and are thoroughly investigated. Read More

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. Read More

2015Dec
Authors: D. Abbaneo1, M. Abbas2, M. Abbrescia3, A. A. Abdelalim4, M. Abi Akl5, O. Aboamer6, D. Acosta7, A. Ahmad8, W. Ahmed9, W. Ahmed10, A. Aleksandrov11, R. Aly12, P. Altieri13, C. Asawatangtrakuldee14, P. Aspell15, Y. Assran16, I. Awan17, S. Bally18, Y. Ban19, S. Banerjee20, V. Barashko21, P. Barria22, G. Bencze23, N. Beni24, L. Benussi25, V. Bhopatkar, S. Bianco, J. Bos, O. Bouhali, A. Braghieri, S. Braibant, S. Buontempo, C. Calabria, M. Caponero, C. Caputo, F. Cassese, A. Castaneda, S. Cauwenbergh, F. R. Cavallo, A. Celik, M. Choi, S. Choi, J. Christiansen, A. Cimmino, S. Colafranceschi, A. Colaleo, A. Conde Garcia, S. Czellar, M. M. Dabrowski, G. De Lentdecker, R. De Oliveira, G. de Robertis, S. Dildick, B. Dorney, W. Elmetenawee, G. Endroczi, F. Errico, A. Fenyvesi, S. Ferry, I. Furic, P. Giacomelli, V. Golovtsov, L. Guiducci, F. Guilloux, A. Gutierrez, R. M. Hadjiiska, A. Hassan, J. Hauser, K. Hoepfner, M. Hohlmann, H. Hoorani, P. Iaydjiev, Y. G. Jeng, T. Kamon, P. Karchin, A. Korytov, S. Krutelyov, A. Kumar, H. Kim, J. Lee, T. Lenzi, L. Litov, F. Loddo, A. Madorsky, T. Maerschalk, M. Maggi, A. Magnani, P. K. Mal, K. Mandal, A. Marchioro, A. Marinov, R. Masod, N. Majumdar, J. A. Merlin, G. Mitselmakher, A. K. Mohanty, S. Muhammad, A. Mohapatra, J. Molnar, S. Mukhopadhyay, M. Naimuddin, S. Nuzzo, E. Oliveri, L. M. Pant, P. Paolucci, I. Park, G. Passeggio, L. Passamonti, B. Pavlov, B. Philipps, D. Piccolo, D. Pierluigi, H. Postema, A. Puig Baranac, A. Radi, R. Radogna, G. Raffone, A. Ranieri, G. Rashevski, C. Riccardi, M. Rodozov, A. Rodrigues, L. Ropelewski, S. RoyChowdhury, A. Russo, G. Ryu, M. S. Ryu, A. Safonov, S. Salva, G. Saviano, A. Sharma, A. Sharma, R. Sharma, A. H. Shah, M. Shopova, J. Sturdy, G. Sultanov, S. K. Swain, Z. Szillasi, A. Tatarinov, T. Tuuva, M. Tytgat, I. Vai, M. Van Stenis, R. Venditti, E. Verhagen, P. Verwilligen, P. Vitulo, S. Volkov, A. Vorobyev, D. Wang, M. Wang, U. Yang, Y. Yang, R. Yonamine, N. Zaganidis, F. Zenoni, A. Zhang
Affiliations: 1Corresponding Author, 2Corresponding Author, 3Corresponding Author, 4Corresponding Author, 5Corresponding Author, 6Corresponding Author, 7Corresponding Author, 8Corresponding Author, 9Corresponding Author, 10Corresponding Author, 11Corresponding Author, 12Corresponding Author, 13Corresponding Author, 14Corresponding Author, 15Corresponding Author, 16Corresponding Author, 17Corresponding Author, 18Corresponding Author, 19Corresponding Author, 20Corresponding Author, 21Corresponding Author, 22Corresponding Author, 23Corresponding Author, 24Corresponding Author, 25Corresponding Author

A novel approach which uses Fibre Bragg Grating (FBG) sensors has been utilised to assess and monitor the flatness of Gaseous Electron Multipliers (GEM) foils. The setup layout and preliminary results are presented. Read More

2015Dec
Authors: D. Abbaneo1, M. Abbas2, M. Abbrescia3, A. A. Abdelalim4, M. Abi Akl5, O. Aboamer6, D. Acosta7, A. Ahmad8, W. Ahmed9, W. Ahmed10, A. Aleksandrov11, R. Aly12, P. Altieri13, C. Asawatangtrakuldee14, P. Aspell15, Y. Assran16, I. Awan17, S. Bally18, Y. Ban19, S. Banerjee20, V. Barashko21, P. Barria22, G. Bencze23, N. Beni24, L. Benussi25, V. Bhopatkar, S. Bianco, J. Bos, O. Bouhali, A. Braghieri, S. Braibant, S. Buontempo, C. Calabria, M. Caponero, C. Caputo, F. Cassese, A. Castaneda, S. Cauwenbergh, F. R. Cavallo, A. Celik, M. Choi, S. Choi, J. Christiansen, A. Cimmino, S. Colafranceschi, A. Colaleo, A. Conde Garcia, S. Czellar, M. M. Dabrowski, G. De Lentdecker, R. De Oliveira, G. de Robertis, S. Dildick, B. Dorney, W. Elmetenawee, G. Endroczi, F. Errico, A. Fenyvesi, S. Ferry, I. Furic, P. Giacomelli, V. Golovtsov, L. Guiducci, F. Guilloux, A. Gutierrez, R. M. Hadjiiska, A. Hassan, J. Hauser, K. Hoepfner, M. Hohlmann, H. Hoorani, P. Iaydjiev, Y. G. Jeng, T. Kamon, P. Karchin, A. Korytov, S. Krutelyov, A. Kumar, H. Kim, J. Lee, T. Lenzi, L. Litov, F. Loddo, A. Madorsky, T. Maerschalk, M. Maggi, A. Magnani, P. K. Mal, K. Mandal, A. Marchioro, A. Marinov, R. Masod, N. Majumdar, J. A. Merlin, G. Mitselmakher, A. K. Mohanty, S. Muhammad, A. Mohapatra, J. Molnar, S. Mukhopadhyay, M. Naimuddin, S. Nuzzo, E. Oliveri, L. M. Pant, P. Paolucci, I. Park, G. Passeggio, L. Passamonti, B. Pavlov, B. Philipps, D. Piccolo, D. Pierluigi, H. Postema, A. Puig Baranac, A. Radi, R. Radogna, G. Raffone, A. Ranieri, G. Rashevski, C. Riccardi, M. Rodozov, A. Rodrigues, L. Ropelewski, S. RoyChowdhury, A. Russo, G. Ryu, M. S. Ryu, A. Safonov, S. Salva, G. Saviano, A. Sharma, A. Sharma, R. Sharma, A. H. Shah, M. Shopova, J. Sturdy, G. Sultanov, S. K. Swain, Z. Szillasi, A. Tatarinov, T. Tuuva, M. Tytgat, I. Vai, M. Van Stenis, R. Venditti, E. Verhagen, P. Verwilligen, P. Vitulo, S. Volkov, A. Vorobyev, D. Wang, M. Wang, U. Yang, Y. Yang, R. Yonamine, N. Zaganidis, F. Zenoni, A. Zhang
Affiliations: 1Corresponding Author, 2Corresponding Author, 3Corresponding Author, 4Corresponding Author, 5Corresponding Author, 6Corresponding Author, 7Corresponding Author, 8Corresponding Author, 9Corresponding Author, 10Corresponding Author, 11Corresponding Author, 12Corresponding Author, 13Corresponding Author, 14Corresponding Author, 15Corresponding Author, 16Corresponding Author, 17Corresponding Author, 18Corresponding Author, 19Corresponding Author, 20Corresponding Author, 21Corresponding Author, 22Corresponding Author, 23Corresponding Author, 24Corresponding Author, 25Corresponding Author

We present a novel application of Fiber Bragg Grating (FBG) sensors in the construction and characterisation of Micro Pattern Gaseous Detector (MPGD), with particular attention to the realisation of the largest triple (Gas electron Multiplier) GEM chambers so far operated, the GE1/1 chambers of the CMS experiment at LHC. The GE1/1 CMS project consists of 144 GEM chambers of about 0.5 m2 active area each, employing three GEM foils per chamber, to be installed in the forward region of the CMS endcap during the long shutdown of LHC in 2108-2019. Read More

2014Dec
Affiliations: 1a, Corresponding author, 2a, 3a, 4a, 5a, 6a, 7a, 8a, 9b, 10b, 11b, 12b, 13b, 14b, 15b, 16b, 17c, 18c, 19d, 20d, 21d, 22d, 23d, 24d, 25d, 26e, 27f, 28f, 29f, 30f, 31f, 32f, 33f, 34f, 35f, 36f, 37f, 38g, 39g, 40g, 41g, 42h, 43i, 44i, 45i, 46i, 47i, 48i, 49i, 50i, 51i, 52l, 53l, 54l, 55l, 56l, 57l, 58m, 59m, 60n, 61n, 62o, 63o, 64p, 65p, 66p, 67p, 68p, 69q, 70q, 71q, 72q, 73q, 74r, 75r, 76r, 77r, 78r, 79r, 80r, 81s, 82s, 83s, 84t, 85t

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. Read More

2014Nov
Authors: D. Abbaneo, M. Abbas, M. Abbrescia, A. A. Abdelalim, M. Abi Akl, W. Ahmed, W. Ahmed, P. Altieri, R. Aly, C. Asawatangtrakuldee, A. Ashfaq, P. Aspell, Y. Assran, I. Awan, S. Bally, Y. Ban, S. Banerjee, P. Barria, L. Benussi, V. Bhopatkar, S. Bianco, J. Bos, O. Bouhali, S. Braibant, S. Buontempo, C. Calabria, M. Caponero, C. Caputo, F. Cassese, A. Castaneda, S. Cauwenbergh, F. R. Cavallo, A. Celik, M. Choi, K. Choi, S. Choi, J. Christiansen, A. Cimmino, S. Colafranceschi, A. Colaleo, A. Conde Garcia, M. M. Dabrowski, G. De Lentdecker, R. De Oliveira, G. de Robertis, S. Dildick, B. Dorney, W. Elmetenawee, G. Fabrice, M. Ferrini, S. Ferry, P. Giacomelli, J. Gilmore, L. Guiducci, A. Gutierrez, R. M. Hadjiiska, A. Hassan, J. Hauser, K. Hoepfner, M. Hohlmann, H. Hoorani, Y. G. Jeng, T. Kamon, P. E. Karchin, H. S. Kim, S. Krutelyov, A. Kumar, J. Lee, T. Lenzi, L. Litov, F. Loddo, T. Maerschalk, G. Magazzu, M. Maggi, Y. Maghrbi, A. Magnani, N. Majumdar, P. K. Mal, K. Mandal, A. Marchioro, A. Marinov, J. A. Merlin, A. K. Mohanty, A. Mohapatra, S. Muhammad, S. Mukhopadhyay, M. Naimuddin, S. Nuzzo, E. Oliveri, L. M. Pant, P. Paolucci, I. Park, G. Passeggio, B. Pavlov, B. Philipps, M. Phipps, D. Piccolo, H. Postema, G. Pugliese, A. Puig Baranac, A. Radi, R. Radogna, G. Raffone, S. Ramkrishna, A. Ranieri, C. Riccardi, A. Rodrigues, L. Ropelewski, S. RoyChowdhury, M. S. Ryu, G. Ryu, A. Safonov, A. Sakharov, S. Salva, G. Saviano, A. Sharma, S. K. Swain, J. P. Talvitie, C. Tamma, A. Tatarinov, N. Turini, T. Tuuva, J. Twigger, M. Tytgat, I. Vai, M. van Stenis, R. Venditi, E. Verhagen, P. Verwilligen, P. Vitulo, D. Wang, M. Wang, U. Yang, Y. Yang, R. Yonamine, N. Zaganidis, F. Zenoni, A. Zhang

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. Read More

2014Nov
Authors: The CMS, LHCb Collaborations, :, V. Khachatryan, A. M. Sirunyan, A. Tumasyan, W. Adam, T. Bergauer, M. Dragicevic, J. Erö, M. Friedl, R. Frühwirth, V. M. Ghete, C. Hartl, N. Hörmann, J. Hrubec, M. Jeitler, W. Kiesenhofer, V. Knünz, M. Krammer, I. Krätschmer, D. Liko, I. Mikulec, D. Rabady, B. Rahbaran, H. Rohringer, R. Schöfbeck, J. Strauss, W. Treberer-Treberspurg, W. Waltenberger, C. -E. Wulz, V. Mossolov, N. Shumeiko, J. Suarez Gonzalez, S. Alderweireldt, S. Bansal, T. Cornelis, E. A. De Wolf, X. Janssen, A. Knutsson, J. Lauwers, S. Luyckx, S. Ochesanu, R. Rougny, M. Van De Klundert, H. Van Haevermaet, P. Van Mechelen, N. Van Remortel, A. Van Spilbeeck, F. Blekman, S. Blyweert, J. D'Hondt, N. Daci, N. Heracleous, J. Keaveney, S. Lowette, M. Maes, A. Olbrechts, Q. Python, D. Strom, S. Tavernier, W. Van Doninck, P. Van Mulders, G. P. Van Onsem, I. Villella, C. Caillol, B. Clerbaux, G. De Lentdecker, D. Dobur, L. Favart, A. P. R. Gay, A. Grebenyuk, A. Léonard, A. Mohammadi, L. Perniè, A. Randle-conde, T. Reis, T. Seva, L. Thomas, C. Vander Velde, P. Vanlaer, J. Wang, F. Zenoni, V. Adler, K. Beernaert, L. Benucci, A. Cimmino, S. Costantini, S. Crucy, S. Dildick, A. Fagot, G. Garcia, J. Mccartin, A. A. Ocampo Rios, D. Ryckbosch, S. Salva Diblen, M. Sigamani, N. Strobbe, F. Thyssen, M. Tytgat, E. Yazgan, N. Zaganidis, S. Basegmez, C. Beluffi, G. Bruno, R. Castello, A. Caudron, L. Ceard, G. G. Da Silveira, C. Delaere, T. du Pree, D. Favart, L. Forthomme, A. Giammanco, J. Hollar, A. Jafari, P. Jez, M. Komm, V. Lemaitre, C. Nuttens, D. Pagano, L. Perrini, A. Pin, K. Piotrzkowski, A. Popov, L. Quertenmont, M. Selvaggi, M. Vidal Marono, J. M. Vizan Garcia, N. Beliy, T. Caebergs, E. Daubie, G. H. Hammad, W. L. Aldá Júnior, G. A. Alves, L. Brito, M. Correa Martins Junior, T. Dos Reis Martins, C. Mora Herrera, M. E. Pol, P. Rebello Teles, W. Carvalho, J. Chinellato, A. Custódio, E. M. Da Costa, D. De Jesus Damiao, C. De Oliveira Martins, S. Fonseca De Souza, H. Malbouisson, D. Matos Figueiredo, L. Mundim, H. Nogima, W. L. Prado Da Silva, J. Santaolalla, A. Santoro, A. Sznajder, E. J. Tonelli Manganote, A. Vilela Pereira, C. A. Bernardes, S. Dogra, T. R. Fernandez Perez Tomei, E. M. Gregores, P. G. Mercadante, S. F. Novaes, Sandra S. Padula, A. Aleksandrov, V. Genchev, R. Hadjiiska, P. Iaydjiev, A. Marinov, S. Piperov, M. Rodozov, G. Sultanov, M. Vutova, A. Dimitrov, I. Glushkov, L. Litov, B. Pavlov, P. Petkov, J. G. Bian, G. M. Chen, H. S. Chen, M. Chen, T. Cheng, R. Du, C. H. Jiang, R. Plestina, F. Romeo, J. Tao, Z. Wang, C. Asawatangtrakuldee, Y. Ban, Q. Li, S. Liu, Y. Mao, S. J. Qian, D. Wang, Z. Xu, W. Zou, C. Avila, A. Cabrera, L. F. Chaparro Sierra, C. Florez, J. P. Gomez, B. Gomez Moreno, J. C. Sanabria, N. Godinovic, D. Lelas, D. Polic, I. Puljak, Z. Antunovic, M. Kovac, V. Brigljevic, K. Kadija, J. Luetic, D. Mekterovic, L. Sudic, A. Attikis, G. Mavromanolakis, J. Mousa, C. Nicolaou, F. Ptochos, P. A. Razis, M. Bodlak, M. Finger, M. Finger Jr., Y. Assran, A. Ellithi Kamel, M. A. Mahmoud, A. Radi, M. Kadastik, M. Murumaa, M. Raidal, A. Tiko, P. Eerola, G. Fedi, M. Voutilainen, J. Härkönen, V. Karimäki, R. Kinnunen, M. J. Kortelainen, T. Lampén, K. Lassila-Perini, S. Lehti, T. Lindén, P. Luukka, T. Mäenpää, T. Peltola, E. Tuominen, J. Tuominiemi, E. Tuovinen, L. Wendland, J. Talvitie, T. Tuuva, M. Besancon, F. Couderc, M. Dejardin, D. Denegri, B. Fabbro, J. L. Faure, C. Favaro, F. Ferri, S. Ganjour, A. Givernaud, P. Gras, G. Hamel de Monchenault, P. Jarry, E. Locci, J. Malcles, J. Rander, A. Rosowsky, M. Titov, S. Baffioni, F. Beaudette, P. Busson, C. Charlot, T. Dahms, M. Dalchenko, L. Dobrzynski, N. Filipovic, A. Florent, R. Granier de Cassagnac, L. Mastrolorenzo, P. Miné, C. Mironov, I. N. Naranjo, M. Nguyen, C. Ochando, G. Ortona, P. Paganini, S. Regnard, R. Salerno, J. B. Sauvan, Y. Sirois, C. Veelken, Y. Yilmaz, A. Zabi, J. -L. Agram, J. Andrea, A. Aubin, D. Bloch, J. -M. Brom, E. C. 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Lohn, A. Mapelli, R. Matev, Z. Mathe, S. Neubert, N. Neufeld, A. Otto, J. Panman, M. Pepe Altarelli, N. Rauschmayr, M. Rihl, S. Roiser, T. Ruf, H. Schindler, B. Schmidt, A. Schopper, R. Schwemmer, S. Sridharan, F. Stagni, V. K. Subbiah, F. Teubert, E. Thomas, D. Tonelli, A. Trisovic, M. Ubeda Garcia, J. Wicht, K. Wyllie, V. Battista, A. Bay, F. Blanc, M. Dorigo, F. Dupertuis, C. Fitzpatrick, S. Gianì, G. Haefeli, P. Jaton, C. Khurewathanakul, I. Komarov, V. N. La Thi, N. Lopez-March, R. Märki, M. Martinelli, B. Muster, T. Nakada, A. D. Nguyen, T. D. Nguyen, C. Nguyen-Mau, J. Prisciandaro, A. Puig Navarro, B. Rakotomiaramanana, J. Rouvinet, O. Schneider, F. Soomro, P. Szczypka, M. Tobin, S. Tourneur, M. T. Tran, G. Veneziano, Z. Xu, J. Anderson, R. Bernet, E. Bowen, A. Bursche, N. Chiapolini, M. Chrzaszcz, Ch. Elsasser, E. Graverini, F. Lionetto, P. Lowdon, K. Müller, N. Serra, O. Steinkamp, B. Storaci, U. Straumann, M. Tresch, A. Vollhardt, R. Aaij, S. Ali, M. van Beuzekom, P. N. Y. David, K. De Bruyn, C. Farinelli, V. Heijne, W. Hulsbergen, E. Jans, P. Koppenburg, A. Kozlinskiy, J. van Leerdam, M. Merk, S. Oggero, A. Pellegrino, H. Snoek, J. van Tilburg, P. Tsopelas, N. Tuning, J. A. de Vries, T. Ketel, R. F. Koopman, R. W. Lambert, D. Martinez Santos, G. Raven, M. Schiller, V. Syropoulos, S. Tolk, A. Dovbnya, S. Kandybei, I. Raniuk, O. Okhrimenko, V. Pugatch, S. Bifani, N. Farley, P. Griffith, I. R. Kenyon, C. Lazzeroni, A. Mazurov, J. McCarthy, L. Pescatore, N. K. Watson, M. P. Williams, M. Adinolfi, J. Benton, N. H. Brook, A. Cook, M. Coombes, J. Dalseno, T. Hampson, S. T. Harnew, P. Naik, E. Price, C. Prouve, J. H. Rademacker, S. Richards, D. M. Saunders, N. Skidmore, D. Souza, J. J. Velthuis, D. Voong, W. Barter, M. -O. Bettler, H. V. Cliff, H. -M. Evans, J. Garra Tico, V. Gibson, S. Gregson, S. C. Haines, C. R. Jones, M. Sirendi, J. Smith, D. R. Ward, S. A. Wotton, S. Wright, J. J. Back, T. Blake, D. C. Craik, A. C. Crocombe, D. Dossett, T. Gershon, M. Kreps, C. Langenbruch, T. Latham, D. P. O'Hanlon, T. Pilař, A. Poluektov, M. M. Reid, R. Silva Coutinho, C. Wallace, M. Whitehead, S. Easo, R. Nandakumar, A. Papanestis, S. Ricciardi, F. F. Wilson, L. Carson, P. E. L. Clarke, G. A. Cowan, S. Eisenhardt, D. Ferguson, D. Lambert, H. Luo, A. -B. Morris, F. Muheim, M. Needham, S. Playfer, M. Alexander, J. Beddow, C. -T. Dean, L. Eklund, D. Hynds, S. Karodia, I. Longstaff, S. Ogilvy, M. Pappagallo, P. Sail, I. Skillicorn, F. J. P. Soler, P. Spradlin, A. Affolder, T. J. V. Bowcock, H. Brown, G. Casse, S. Donleavy, K. Dreimanis, S. Farry, R. Fay, K. Hennessy, D. Hutchcroft, M. Liles, B. McSkelly, G. D. Patel, J. D. Price, A. Pritchard, K. Rinnert, T. Shears, N. A. Smith, G. Ciezarek, S. Cunliffe, R. Currie, U. Egede, P. Fol, A. Golutvin, S. Hall, M. McCann, P. Owen, M. Patel, K. Petridis, F. Redi, I. Sepp, E. Smith, W. Sutcliffe, D. Websdale, R. B. Appleby, R. J. Barlow, T. Bird, P. M. Bjørnstad, S. Borghi, D. Brett, J. Brodzicka, L. Capriotti, S. Chen, S. De Capua, G. Dujany, M. Gersabeck, J. Harrison, C. Hombach, S. Klaver, G. Lafferty, A. McNab, C. Parkes, A. Pearce, S. Reichert, E. Rodrigues, P. Rodriguez Perez, M. Smith, S. -F. Cheung, D. Derkach, T. Evans, R. Gauld, E. Greening, N. Harnew, D. Hill, P. Hunt, N. Hussain, J. Jalocha, M. John, O. Lupton, S. Malde, E. Smith, S. Stevenson, C. Thomas, S. Topp-Joergensen, N. Torr, G. Wilkinson, I. Counts, P. Ilten, M. Williams, R. Andreassen, A. Davis, W. De Silva, B. Meadows, M. D. Sokoloff, L. Sun, J. Todd, J. E. Andrews, B. Hamilton, A. Jawahery, J. Wimberley, M. Artuso, S. Blusk, A. Borgia, T. Britton, S. Ely, P. Gandini, J. Garofoli, B. Gui, C. Hadjivasiliou, N. Jurik, M. Kelsey, R. Mountain, B. K. Pal, T. Skwarnicki, S. Stone, J. Wang, Z. Xing, L. Zhang, C. Baesso, M. Cruz Torres, C. Göbel, J. Molina Rodriguez, Y. Xie, D. A. Milanes, O. Grünberg, M. Heß, C. Voß, R. Waldi, T. Likhomanenko, A. Malinin, V. Shevchenko, A. Ustyuzhanin, F. Martinez Vidal, A. Oyanguren, P. Ruiz Valls, C. Sanchez Mayordomo, C. J. G. Onderwater, H. W. Wilschut, E. Pesen

A joint measurement is presented of the branching fractions $B^0_s\to\mu^+\mu^-$ and $B^0\to\mu^+\mu^-$ in proton-proton collisions at the LHC by the CMS and LHCb experiments. The data samples were collected in 2011 at a centre-of-mass energy of 7 TeV, and in 2012 at 8 TeV. The combined analysis produces the first observation of the $B^0_s\to\mu^+\mu^-$ decay, with a statistical significance exceeding six standard deviations, and the best measurement of its branching fraction so far. Read More

Resistive Plate Counters (RPC) detectors at the Large Hadron Collider (LHC) experiments use gas recirculation systems to cope with large gas mixture volumes and costs. In this paper a long-term systematic study about gas purifiers, gas contaminants and detector performance is discussed. The study aims at measuring the lifetime of purifiers with new and used cartridge material along with contaminants release in the gas system. Read More

2013Jan
Affiliations: 1University of Sofia, Faculty of Physics, Atomic Physics Department, 5 James Bourchier Boulevard, BG-1164 Sofia, Bulgaria, 2University of Sofia, Faculty of Physics, Atomic Physics Department, 5 James Bourchier Boulevard, BG-1164 Sofia, Bulgaria, 3University of Sofia, Faculty of Physics, Atomic Physics Department, 5 James Bourchier Boulevard, BG-1164 Sofia, Bulgaria, 4University of Sofia, Faculty of Physics, Atomic Physics Department, 5 James Bourchier Boulevard, BG-1164 Sofia, Bulgaria, 5University of Sofia, Faculty of Physics, Atomic Physics Department, 5 James Bourchier Boulevard, BG-1164 Sofia, Bulgaria, 6Ghent University, Department of Physics and Astronomy, Proeftuinstraat 86, B-9000 Gent, Belgium, 7Ghent University, Department of Physics and Astronomy, Proeftuinstraat 86, B-9000 Gent, Belgium, 8Ghent University, Department of Physics and Astronomy, Proeftuinstraat 86, B-9000 Gent, Belgium, 9Ghent University, Department of Physics and Astronomy, Proeftuinstraat 86, B-9000 Gent, Belgium, 10Ghent University, Department of Physics and Astronomy, Proeftuinstraat 86, B-9000 Gent, Belgium, 11Ghent University, Department of Physics and Astronomy, Proeftuinstraat 86, B-9000 Gent, Belgium, 12Ghent University, Department of Physics and Astronomy, Proeftuinstraat 86, B-9000 Gent, Belgium, 13Ghent University, Department of Physics and Astronomy, Proeftuinstraat 86, B-9000 Gent, Belgium, 14Ghent University, Department of Physics and Astronomy, Proeftuinstraat 86, B-9000 Gent, Belgium, 15Ghent University, Department of Physics and Astronomy, Proeftuinstraat 86, B-9000 Gent, Belgium, 16Ghent University, Department of Physics and Astronomy, Proeftuinstraat 86, B-9000 Gent, Belgium, 17Ghent University, Department of Physics and Astronomy, Proeftuinstraat 86, B-9000 Gent, Belgium, 18Ghent University, Department of Physics and Astronomy, Proeftuinstraat 86, B-9000 Gent, Belgium, 19Bulgarian Academy of Sciences, Inst. for Nucl. Res. and Nucl. Energy, Tzarigradsko shaussee Boulevard 72, BG-1784 Sofia, Bulgaria, 20Bulgarian Academy of Sciences, Inst. for Nucl. Res. and Nucl. Energy, Tzarigradsko shaussee Boulevard 72, BG-1784 Sofia, Bulgaria, 21Bulgarian Academy of Sciences, Inst. for Nucl. Res. and Nucl. Energy, Tzarigradsko shaussee Boulevard 72, BG-1784 Sofia, Bulgaria, 22Bulgarian Academy of Sciences, Inst. for Nucl. Res. and Nucl. Energy, Tzarigradsko shaussee Boulevard 72, BG-1784 Sofia, Bulgaria, 23Bulgarian Academy of Sciences, Inst. for Nucl. Res. and Nucl. Energy, Tzarigradsko shaussee Boulevard 72, BG-1784 Sofia, Bulgaria, 24Bulgarian Academy of Sciences, Inst. for Nucl. Res. and Nucl. Energy, Tzarigradsko shaussee Boulevard 72, BG-1784 Sofia, Bulgaria, 25Peking University, School of Physics, CN-100871 Beijing, China, 26Peking University, School of Physics, CN-100871 Beijing, China, 27Peking University, School of Physics, CN-100871 Beijing, China, 28Peking University, School of Physics, CN-100871 Beijing, China, 29Peking University, School of Physics, CN-100871 Beijing, China, 30Peking University, School of Physics, CN-100871 Beijing, China, 31Universidad de Los Andes, Apartado A'ereo 4976, Carrera 1E, no. 18A 10, CO-Bogot'a, Colombia, 32Universidad de Los Andes, Apartado A'ereo 4976, Carrera 1E, no. 18A 10, CO-Bogot'a, Colombia, 33Universidad de Los Andes, Apartado A'ereo 4976, Carrera 1E, no. 18A 10, CO-Bogot'a, Colombia, 34Universidad de Los Andes, Apartado A'ereo 4976, Carrera 1E, no. 18A 10, CO-Bogot'a, Colombia, 35Universidad de Los Andes, Apartado A'ereo 4976, Carrera 1E, no. 18A 10, CO-Bogot'a, Colombia, 36Universidad de Los Andes, Apartado A'ereo 4976, Carrera 1E, no. 18A 10, CO-Bogot'a, Colombia, 37Academy of Scientific Research and Technology of the Arab Republic of Egypt, 101 Sharia Kasr El-Ain, Cairo, Egypt, 38Panjab University, Department of Physics, Chandigarh Mandir 160 014, India, 39Universita e INFN, Sezione di Bari, Via Orabona 4, IT-70126 Bari, Italy, 40Universita e INFN, Sezione di Bari, Via Orabona 4, IT-70126 Bari, Italy, 41Universita e INFN, Sezione di Bari, Via Orabona 4, IT-70126 Bari, Italy, 42Universita e INFN, Sezione di Bari, Via Orabona 4, IT-70126 Bari, Italy, 43Universita e INFN, Sezione di Bari, Via Orabona 4, IT-70126 Bari, Italy, 44Universita e INFN, Sezione di Bari, Via Orabona 4, IT-70126 Bari, Italy, 45INFN, Laboratori Nazionali di Frascati, 46INFN, Laboratori Nazionali di Frascati, 47INFN, Laboratori Nazionali di Frascati, 48INFN, Laboratori Nazionali di Frascati, 49Universita e INFN, Sezione di Napoli, Complesso Univ. Monte S. Angelo, Via Cintia, IT-80126 Napoli, Italy, 50Universita e INFN, Sezione di Napoli, Complesso Univ. Monte S. Angelo, Via Cintia, IT-80126 Napoli, Italy, 51Universita e INFN, Sezione di Napoli, Complesso Univ. Monte S. Angelo, Via Cintia, IT-80126 Napoli, Italy, 52Universita e INFN, Sezione di Napoli, Complesso Univ. Monte S. Angelo, Via Cintia, IT-80126 Napoli, Italy, 53Universita e INFN, Sezione di Pavia, Via Bassi 6, IT-Pavia, Italy, 54Universita e INFN, Sezione di Pavia, Via Bassi 6, IT-Pavia, Italy, 55Universita e INFN, Sezione di Pavia, Via Bassi 6, IT-Pavia, Italy, 56Korea University, Physics Department, Seoul Cheongryangri 143-701, Republic of Korea, 57Korea University, Physics Department, Seoul Cheongryangri 143-701, Republic of Korea, 58Korea University, Physics Department, Seoul Cheongryangri 143-701, Republic of Korea, 59Korea University, Physics Department, Seoul Cheongryangri 143-701, Republic of Korea, 60Sungkyunkwan University, Department of Physics, 2066, Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do, Republic of Korea, 61Sungkyunkwan University, Department of Physics, 2066, Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do, Republic of Korea, 62Sungkyunkwan University, Department of Physics, 2066, Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do, Republic of Korea, 63Sungkyunkwan University, Department of Physics, 2066, Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do, Republic of Korea, 64National Centre for Physics, Q.A.U Campus, Shahdra Valley Road, Islamabad 44000, Pakistan

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. Read More

Based on the CMS Upgrade R&D Proposal RD10.02, we describe the motivation and main features of the CMS GEM Project for LS2 and propose the addition of a full GE1/12 detector station comprising Gas Electron Multiplier (GEM) chambers to the forward muon system of CMS. The limitations of the currently existing forward muon detector when operating at increasingly high luminosity expected after LS1 are laid out followed by a brief description of the anticipated performance improvements achievable with a GE1/1 station. Read More

Resistive Plate Counters (RPC) detectors at the Large Hadron Collider (LHC) experiments use gas recirculation systems to cope with large gas mixture volumes and costs. In this paper a long-term systematic study about gas purifiers, gas contaminants and detector performance is discussed. The study aims at measuring the lifetime of purifiers with unused and used cartridge material along with contaminants release in the gas system. Read More

The Gas Gain Monitoring (GGM) system of the Resistive Plate Chamber (RPC) muon detector in the Compact Muon Solenoid (CMS) experiment provides fast and accurate determination of the stability in the working point conditions due to gas mixture changes in the closed loop recirculation system. In 2011 the GGM began to operate using a feedback algorithm to control the applied voltage, in order to keep the GGM response insensitive to environmental temperature and atmospheric pressure variations. Recent results are presented on the feedback method used and on alternative algorithms. Read More

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. Read More

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. Read More

2011Nov
Affiliations: 1Member, IEEE, 2Member, IEEE, 3Member, IEEE, 4Member, IEEE, 5Member, IEEE, 6Member, IEEE, 7Member, IEEE, 8Member, IEEE, 9Member, IEEE, 10Member, IEEE, 11Member, IEEE, 12Member, IEEE, 13Member, IEEE, 14Member, IEEE, 15Member, IEEE, 16Member, IEEE, 17Member, IEEE, 18Member, IEEE, 19Member, IEEE, 20Member, IEEE, 21Member, IEEE, 22Member, IEEE, 23Member, IEEE, 24Member, IEEE, 25Member, IEEE, 26Member, IEEE, 27Member, IEEE, 28Member, IEEE, 29Member, IEEE, 30Senior Member, IEEE, 31Senior Member, IEEE, 32Senior Member, IEEE, 33Senior Member, IEEE, 34Senior Member, IEEE, 35Senior Member, IEEE, 36Senior Member, IEEE, 37Senior Member, IEEE, 38Senior Member, IEEE, 39Senior Member, IEEE, 40Senior Member, IEEE, 41Senior Member, IEEE, 42Senior Member, IEEE, 43Senior Member, IEEE, 44Senior Member, IEEE, 45Senior Member, IEEE, 46Senior Member, IEEE, 47Senior Member, IEEE, 48Senior Member, IEEE, 49Senior Member, IEEE, 50Member, IEEE, 51Member, IEEE, 52Member, IEEE

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. Read More

2008Dec
Affiliations: 1INFN Laboratori Nazionali di Frascati, 2INFN Laboratori Nazionali di Frascati, 3INFN Laboratori Nazionali di Frascati, 4INFN Laboratori Nazionali di Frascati, 5INFN Laboratori Nazionali di Frascati, 6INFN Laboratori Nazionali di Frascati, 7INFN Laboratori Nazionali di Frascati, 8INFN Laboratori Nazionali di Frascati, 9INFN Laboratori Nazionali di Frascati, 10INFN Laboratori Nazionali di Frascati, 11INFN Laboratori Nazionali di Frascati, 12INFN Sezione di Bari, 13INFN Sezione di Bari, 14INFN Sezione di Bari, 15INFN Sezione di Bari, 16INFN Sezione di Bari, 17INFN Sezione di Bari, 18INFN Sezione di Bari, 19INFN Sezione di Bari, 20INFN Sezione di Bari, 21INFN Sezione di Bari, 22INFN Sezione di Bari, 23INFN Sezione di Bari, 24INFN Sezione di Bari, 25INFN Sezione di Bari, 26CERN, 27CERN, 28CERN, 29INFN Sezione di Napoli, 30Università di Napoli Federico II, 31Università di Napoli Federico II, 32Università di Napoli Federico II, 33INFN Sezione di Pavia, 34INFN Sezione di Pavia, 35INFN Sezione di Pavia, 36INFN Sezione di Pavia, 37INFN Sezione di Pavia, 38INFN Sezione di Pavia

Results from the gas gain monitoring (GGM) system for the muon detector using RPC in the CMS experiment at the LHC is presented. The system is designed to provide fast and accurate determination of any shift in the working point of the chambers due to gas mixture changes. Read More

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. Read More

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. Read More