TY - JOUR
T1 - A monitoring system of the fast-timing scintillation counters used for detection of air showers
AU - Nishizawa, M.
AU - Hibino, K.
AU - Ohnishi, M.
AU - Sakata, M.
AU - Shima, M.
AU - Yamamoto, Y.
AU - Sugimoto, H.
AU - Taira, K.
AU - Shibata, M.
AU - Shirai, T.
AU - Tateyama, N.
AU - Torii, Shoji
AU - Kasahara, K.
AU - Saito, To
AU - Yuda, T.
AU - Mizutani, K.
AU - Hotta, N.
AU - Ohta, I.
AU - Amenomori, M.
AU - Nanjo, H.
PY - 1989/12/20
Y1 - 1989/12/20
N2 - 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.
AB - 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.
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U2 - 10.1016/0168-9002(89)90229-5
DO - 10.1016/0168-9002(89)90229-5
M3 - Article
AN - SCOPUS:0024906004
SN - 0168-9002
VL - 285
SP - 532
EP - 539
JO - Nuclear Inst. and Methods in Physics Research, A
JF - Nuclear Inst. and Methods in Physics Research, A
IS - 3
ER -