A monitoring system of the fast-timing scintillation counters used for detection of air showers

M. Nishizawa, K. Hibino, M. Ohnishi, M. Sakata, M. Shima, Y. Yamamoto, H. Sugimoto, K. Taira, M. Shibata, T. Shirai, N. Tateyama, Shoji Torii, K. Kasahara, To Saito, T. Yuda, K. Mizutani, N. Hotta, I. Ohta, M. Amenomori, H. Nanjo

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6 Citations (Scopus)


A monitoring system of the time-offset values, the gains and linearity relations of the responses of scintillation counters has been developed to detect the air shower disks precisely. The system consists of a nitrogen-gas pulse laser, an attenuation unit of the light intensity, optical fiber cables delivering the light pulses to each scintillation counter, and of a microcomputer operating the whole system. It is confirmed by the air shower array at Mt Norikura that the time-offset values and their dependences on light intensity can be monitored with an accuracy of ±0.22 ns within one standard deviation (1σ). According to a simulation with this accuracy, the system can give an angular resolution as low as 0.33° in the median value for the case of the smallest array of four detectors with a 15 m span for vertical incidence. The linearity of the responses of each scintillation counter is achieved with an accuracy of ±0.2% in 1σ in the range of three orders of magnitude of the light intensity, and its absolute gain is given with ±2% in 1σ.

Original languageEnglish
Pages (from-to)532-539
Number of pages8
JournalNuclear Inst. and Methods in Physics Research, A
Issue number3
Publication statusPublished - 1989 Dec 20
Externally publishedYes

ASJC Scopus subject areas

  • Instrumentation
  • Nuclear and High Energy Physics
  • Engineering(all)


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