Systematic studies of aging effects in RPCs for the CMS/LHC experiment

Sung Keun Park, S. H. Ahn, Byungsik Hong, S. J. Hong, M. Ito, T. I. Kang, B. I. Kim, J. H. Kim, K. B. Lee, K. S. Lee, J. K. Lim, D. H. Moon, W. J. Park, M. S. Ryu, K. S. Sim, S. Y. Bahk, Y. J. Kim, Y. U. Kim, D. G. Koo, S. J. LeeS. K. Nam, J. T. Rhee

Research output: Contribution to journalArticle

11 Citations (Scopus)


An intensive aging study for the forward resistive plate chambers (RPCs) was performed by using a 200 mCi 137Cs gamma-ray source. For the systematic aging study, four double-gap RPCs, 40 × 40 cm 2, were manufactured and tested for cosmic muons and the gamma rays irradiated from the source. The aging of the RPC gap is expected to be proportional to the integrated avalanche charge per unit area of the RPC. In this paper, a few diagnostic methods to observe aging phenomena are discussed, and the test result for a gamma irradiation of 150 days are presented. The integrated avalanche charge per unit area induced by the gamma rays in the RPC gap was 0.23 C/cm 2/gap on average, which is equivalent to approximately 12 years of Compact Muon Solenoid (CMS) RPC operation.

Original languageEnglish
Pages (from-to)427-433
Number of pages7
JournalJournal of the Korean Physical Society
Issue number3
Publication statusPublished - 2005 Sep 1



  • Aging effect
  • Compact muon solenoid
  • Double gap RPC
  • Forward RPCs
  • Linseed oil treatment
  • Muon trigger detector

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Park, S. K., Ahn, S. H., Hong, B., Hong, S. J., Ito, M., Kang, T. I., Kim, B. I., Kim, J. H., Lee, K. B., Lee, K. S., Lim, J. K., Moon, D. H., Park, W. J., Ryu, M. S., Sim, K. S., Bahk, S. Y., Kim, Y. J., Kim, Y. U., Koo, D. G., ... Rhee, J. T. (2005). Systematic studies of aging effects in RPCs for the CMS/LHC experiment. Journal of the Korean Physical Society, 47(3), 427-433.