Monitoring for telescope array fluorescence detector PMT camera by YAP and Xe flasher
- Authors
- Shin, Bokkyun; Tokuno, H.; Ikeda, Daisuke; Fukushima, Masaki; Tsunesada, Yoshiki; Cheon, Byung Gu; Sagawa, Hisao
- Issue Date
- Oct-2013
- Publisher
- Sociedade Brasileira de Fisica
- Keywords
- Fluoresence detector; Icrc2013; Monitoring; PMT; Xenon flasher; YAP
- Citation
- Proceedings of the 33rd International Cosmic Rays Conference, ICRC 2013, v.2013-October, pp.1 - 4
- Indexed
- SCOPUS
- Journal Title
- Proceedings of the 33rd International Cosmic Rays Conference, ICRC 2013
- Volume
- 2013-October
- Start Page
- 1
- End Page
- 4
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/143680
- ISSN
- 0000-0000
- Abstract
- Gain stability of the photomultiplier (PMT) cameras for The Fluorescence Detectors (FD) in the Telescope Array experiment has been monitored by using Am-241 loaded scintillator pulsers (YAP) and diffused xenon flashers (TXF). Each FD camera consists of 16 × 16 PMT(Hamamatsu-R9508) array, and contains two or three absolutely calibrated PMTs carrying a YAP. YAP, which is attached on an PMT cathode, is a small light source which emits UV photons at 50Hz. A TXF which is a relative calibration installed on each camera shoots photons simultaneously on all the 256 PMTs uniformly from about 3 meter away. From the monitoring of YAP pulsers over 4 years of FD operation we found an annual average of slow monotonic PMT gains drift is 0.01 ± 0.31(stat.) ± 0.21(syst.)% and it’s sigma is 1.7%. In conclusion, no systematic PMT gain decrease by the night sky background was observed. A gains monitoring by the TXF also shows the same PMT gain drifts within the annual magnitude of 0.86 ± 0.13(stat.)%/yearl.
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