Abstract
CMS experiment built the fourth Resistive Plate Chamber (RPC) trigger station composed of 144 RPCs to enhance the high momentum muon trigger efficiency at both endcap regions. All new CMS endcap RPC gaps are produced in accordance with QA and QC at the Korea Detector Laboratory (KODEL) in Korea. All qualified gaps have been delivered to three assembly sites: CERN in Switzerland, BARC in India, and Ghent University in Belgium for the RPC detector assembly. In this paper, we present the detailed procedures used in the production of RPC gaps adopted for the CMS upgrade.
Highlights
Should range from 100 to 250 kΩ/square [2]
Another property of the Resistive Plate Chamber (RPC) gap to check in QC-2 is the gas leakage rate
The oiled surface forms the polymerized layer. It shows that the polymerized layer on the surface of the bakelite inside the gas volume reduces the spurious noise by a factor of 10 in the avalanche operation mode [3]
Summary
Should range from 100 to 250 kΩ/square [2]. The step of the QC-2 is to check the mechanical stability of the gap once it is produced. The pressure variation of the gaps when the spacer is pressed by a KODEL robot is an effective indicator of the good bonding, as Fig. 3 shows. Another property of the RPC gap to check in QC-2 is the gas leakage rate. This leakage rate measurement is performed within the frame work of the bonding test.
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