Beam test results of CMS RPCs at high eta region under high-radiation environment

S. Park, S. H. Ahn, S. Y. Bahk, B. Hong, S. J. Hong, D. H. Kang, T. I. Kang, T. J. Kim, Y. J. Kim, Y. U. Kim, D. G. Koo, H. W. Lee, K. S. Lee, S. J. Lee, J. K. Lim, D. H. Moon, S. K. Nam, J. K. Oh, W. J. Park, J. T. RheeM. S. Ryu, H. H. Shim, K. S. Sim

Research output: Contribution to journalConference articlepeer-review

16 Citations (Scopus)


The Compact Muon Solenoid (CMS) forward resistivity plate chambers (RPCs) at the high eta region must be operated in presence of a radiation-induced rate as high as 1 kHz/cm2. It is still unknown if the RPCs coated with linseed oil can be operated under such a high-radiation environment over the lifetime of CMS. Non-oiled RPCs may be one of the options since phenolic or melamine-coated bakelite is chemically stabler than linseed oil. We have constructed oiled and non-oiled RPCs at the high eta region of CMS using phenolic bakelite and tested them in the Gamma Irradiation Facility at CERN. While both RPCs show the same characteristics in the efficiency and the strip multiplicity, the non-oiled RPC generates an intrinsic noise rate of 50 Hz/cm2, compared to only 5 Hz/cm2 for the oiled RPC, both at 10.0kV which is about 100 V above the 95% knee of the efficiency curve.

Original languageEnglish
Pages (from-to)37-41
Number of pages5
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Issue number1-2
Publication statusPublished - 2004 Nov 1
EventProceedings of the Seventh International Workshop on Resistive - Clermont-Ferrand, France
Duration: 2003 Oct 202003 Oct 22


  • CMS
  • LHC
  • Melamine
  • Non-oiled RPC
  • Oiled RPC
  • Phenolic

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation


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