Gain monitoring of telescope array photomultiplier cameras for the first 4 years of operation

Title
Gain monitoring of telescope array photomultiplier cameras for the first 4 years of operation
Author
천병구
Keywords
Ultra-high energy cosmic rays; Air fluorescence telescope; Calibration of photomultiplier
Issue Date
2014-10
Publisher
Elsevier Science B.V., Amsterdam.
Citation
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 768권, pp.96-103
Abstract
The stability of the gain of the photomultiplier (PMT) camera for the Fluorescence Defector (FD) of the Telescope Array experiment was monitored using an Am-241 loaded scintillator pulsers (YAP) and a diffused xenon flasher (TXF) for a selected set of 35 PMT-readout channels. From the monitoring of YAP pulses over four years of FD operation, we found slow monotonic drifts of PMT gains at a rate of -1.7 similar to +1.7%/year. An average of the PMT gains over the 35 channels stayed nearly constant with a rate of change measured at -0.01 +/- 0.31(stat) +/- 0.21(sys)%/year. No systematic decrease of the PMT gain caused by the night sky background was observed. Monitoring by the TXF also tracked the PMT gain drift of the YAP at 0.88 +/- 0.14(stat)%/year. (C) 2014 Elsevier B.V. All rights reserved.
URI
http://dx.doi.org/10.1016/j.nima.2014.09.059http://hdl.handle.net/20.500.11754/51071
ISBN
1872-9576
ISSN
0168-9002
DOI
10.1016/j.nima.2014.09.059
Appears in Collections:
COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > PHYSICS(물리학과) > Articles
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