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We report on a systematic study of double-gap and four-gap phenolic resistiveplate chambers (RPCs) for future high-{\eta} RPC triggers in the CMS. In thepresent study, we constructed real-sized double-gap and four-gap RPCs with gapthicknesses of 1.6 and 0.8 mm, respectively, with 2-mm-thick phenolichigh-pressure-laminated (HPL) plates. We examined the prototype RPCs for cosmicrays and 100 GeV muons provided by the SPS H4 beam line at CERN. We appliedmaximum gamma rates of 1.5 kHz cm-2 provided by 137Cs sources at KoreaUniversity and the GIF++ irradiation facility installed at the SPS H4 beam lineto examine the rate capabilities of the prototype RPCs. In contrast to the caseof the four-gap RPCs, we found the relatively high threshold was conducive toeffectively suppressing the rapid increase of strip cluster sizes of muon hitswith high voltage, especially when measuring the narrow-pitch strips. Thegamma-induced currents drawn in the four-gap RPC were about one-fourth of thosedrawn in the double-gap RPC. The rate capabilities of both RPC types, proventhrough the present testing using gamma-ray sources, far exceeded the maximumrate expected in the new high-{\eta} endcap RPCs planned for future phase-IILHC runs.

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