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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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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