We present the results from cosmic ray tests on the forward Resistive Plate Chamber (RPC) for the CMS. Double-gap prototype RPC were built and tested in the Korea Detector Laboratory (KODEL). We found that addition of SF6 and water vapor to the tetrafluorethane-based gas mixture was required for the long-term stable operation of RPC. Efficiency, time resolution as well as cross-talk behavior of the detector were investigated. In addition, we present the temperature and humidity dependence of bulk resistivity of Korean bakelite in detail.
Ahn, S. H., Amirikas, R., Bahk, S. Y., Baik, K. M., Gapienko, V. A., Hong, B., … Sim, K. S. (2000). Study on the operational conditions of a double-gap resistive plate chamber for the CMS. Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 456(1–2), 29–34. https://doi.org/10.1016/S0168-9002(00)00957-8