CERN Accelerating science

CMS Note
Report number	CMS-NOTE-2007-031
Title	Efficiency of Finding Muon Track Trigger Primitives in CMS Cathode Strip Chambers
Author(s)	Acosta, Darin ; Adam, A ; 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 (contact person) ; 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
To be published in:	Nucl. Instrum. Methods Phys. Res., A
Submitted by	17 Oct 2007
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; CMS
Free keywords	MUONS
Abstract	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 information for the Level-1 muon trigger and, also, are a necessary condition for chambers to be read out by the Data Acquisition System.
Copyright/License	Preprint: (License: CC-BY-4.0)

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