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Study of Thin Double-Gap RPCs for the CMS Muon System
K. S. Lee,S. W. Cho,S. Choi,B. Hong,M. Kang,J. H. Lim,Y. M. Jo,S. K. Park,K. R. Ryoo,R. Aly,S. Aly,Y. Assran,A. Mohamed,A. Mahrous,S. Constantini,M. Abbrescia,A. Gelmi,M. Maggi,G. Iaselli,G. Pugliese 한국물리학회 2018 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.73 No.8
High-sensitivity double-gap phenolic resistive plate chambers (RPCs) are studied for the Phase-2 upgrade of the Compact Muon Solenoid (CMS) muon system at high pseudorapidity . 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 by using high-pressure laminated plates having a mean resistivity of about 5 1010 -cm. This paper presents test results using cosmic muons and 137Cs gamma rays. The rate capabilities of these thin-gap RPCs measured with the gamma source exceed the maximum rate expected in the new high- endcap RPCs planned for future Phase-2 runs of the Large Hadron Collider (LHC).