Time-of-propagation counter for the LEPS

C. J. Yoon, H. Hamano, T. Hotta, Y. Kasamatsu, Y. Morino, Y. Nakatsugawa, T. Nakano, T. Nam, H. Noumi, M. Oka, S. Y. Ryu, M. Yosoi, K. Matsuoka, Y. Kato, Y. Arita, K. Inami, K. Suzuki, T. Hyakawa, T. Iijima, R. MaeshimaS. Hirose, Y. Horii, M. Niiyama, Y. Nozawa, N. Muramatsu, E. A. Strokovsky, M. Uchida, M. Barrett, T. Browder, M. Jones, S. Korpar

Research output: Contribution to journalArticlepeer-review


We have tested a time-of-propagation (TOP) counter, which is a ring-image Cherenkov counter utilizing the position and propagation time of the Cherenkov light produced by particles moving in a quartz radiator. Position-sensitive photomultipliers (PMTs) are attached to the end of the quartz bar to detect the produced Cherenkov-ring image. The velocity of the charged particle was determined by comparing the time-of-propagation spectra of the Cherenkov light with the results of Monte Carlo simulation. From analysis of the test experiment using the 1.22-GeV/c electron beam at SPring-8, we determined the velocity of the electron beam to be 1.001 with a resolution of 0.002. On the basis of this study, we suggest a full setup for the detector for separating pions and kaons in the momentum region from 1.5 to 2.0 GeV/c for a beam angle of less than 6 , by more than four standard deviations.

Original languageEnglish
Article number2344037
Pages (from-to)2601-2607
Number of pages7
JournalIEEE Transactions on Nuclear Science
Issue number5
Publication statusPublished - 2014 Oct 1


  • Fused quartz
  • Position-sensitive photomultiplier
  • Ring-image cherenkov counter
  • TOP counter
  • Time-of-propagation

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering
  • Electrical and Electronic Engineering


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