15 October 2010 A method for calibrating PMTs in T0 system for beam test
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Abstract
In order to study the performance of MRPC, which will be used for the upgrade of the Endcap TOF in BES III, a T0 system is composed of high speed response PMTs H6533 coupling with BC420 plastic scintillators. Because the T0 system should offer a toughly strict timing start, the high precision electronics based on VME system were used to test the SPS (single-photoelectron spectrum) of H6533 PMT. A suitable operation voltage for optimal performance is confirmed by researching the dependence relationship between the PMT gain and energy resolution of SPS (single-photoelectron spectrum). At the end, the timing resolution of this type of T0 system was 41.6 ps in the cosmic ray test and 39.1 ps in the proto beam test.
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Sen Qian, Zaiwei Fu, Zhe Ning, Zhigang Wang, Shuai Yang, Yifang Wang, Yuekun Heng, ShuDong Liu, Jiawen Zhang, Ming Qi, Yangheng Zhen, Cheng Li, "A method for calibrating PMTs in T0 system for beam test", Proc. SPIE 7847, Optoelectronic Devices and Integration III, 784708 (15 October 2010); doi: 10.1117/12.871692; https://doi.org/10.1117/12.871692
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