par Abu-Zayyad, Tareq;Tiniakov, Petr 
; [et al.]
Référence Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, A768, page (96-103)
Publication Publié, 2014
; [et al.]Référence Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, A768, page (96-103)
Publication Publié, 2014
Article révisé par les pairs
| Résumé : | The stability of the gain of the photomultiplier (PMT) camera for the Fluorescence Detector (FD) of the Telescope Array experiment was monitored using an 241Am 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∼+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. |
