Abstract
In this paper, we report on the systematic rate-capability study of four-gap phenolic resistive plate chambers (RPCs), with cosmic muons and gamma rays emitted from a 137Cs source. A prototype four-gap RPC with a gap thickness of 1.06 mm has been constructed with 2-mm thick phenolic high-pressure-laminated (HPL) plates. A 32-channel front-end-electronics board, which has been developed for the operation of the current double-gap RPCs in the CMS experiment, was used to digitize the detector signals of the prototype RPC, with charge thresholds of 80, 130, and 170 fC. The cosmic muons were reliably measured with efficiencies of higher than 95%, at a maximum gamma-hit rate of 5 kHz cm−2. The present research confirms that the use of the current four-gap phenolic RPCs is advantageous to the high-η triggers in CMS, by virtue of the high rate capability.
Highlights
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
In this paper, we report on the systematic rate-capability study of four-gap phenolic resistive plate chambers (RPCs), with cosmic muons and gamma rays emitted from a 137Cs source
The gas mixture to test the prototype four-gap RPC was composed of 95.2% C2H2F4, 4.5% i-C4H10, 0.3% SF6
Summary
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. We report on the systematic rate-capability study of four-gap phenolic resistive plate chambers (RPCs), with cosmic muons and gamma rays emitted from a 137Cs source. A 32-channel front-end-electronics board, which has been developed for the operation of the current double-gap RPCs in the CMS experiment, was used to digitize the detector signals of the prototype RPC, with charge thresholds of 80, 130, and 170 fC. The bulk resistivity of the resistive plates (here, HPL panels for phenolic RPCs) can be obtained by measuring the total resistance of the RPC gaps, by operating the RPC with high-rate gamma hits [7].
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