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1. chinaXiv:201609.00908 [pdf]

Evaluation of new large area PMT with high quantum efficiency

LEI Xiang-Cui; HENG Yue-Kun; QIAN Sen; XIA Jing-Kai; LIU Shu-Lin; WU Zhi; YAN Bao-Jun; XU Mei-Hang; WANG Zheng LI Xiao-Nan; RUAN Xiang-Dong; Wang Xiao-Zhuang; YANG Yu-Zhen; WANG Wen-Wen; FANG Can; LUO Feng-Jiao; LIANG Jing-Jing 1,4 YANG Lu-Ping 1,7 YANG Biao 1,2
Subjects: Physics >> Nuclear Physics

The neutrino detector of the Jiangmen Underground Neutrino Observatory (JUNO) is designed to use 20 kilotons of liquid scintillator and approximately 16,000 20-inch photomultipliers (PMTs).One of the options is to use the 20-inch R12860 PMT with high quantum efficiency which has recently been developed by Hamamatsu Photonics. The performance of the newly developed PMT preproduction samples is evaluated. The results show that its quantum efficiency is?0%燼t?00nm. Its Peak/Valley (P/V) ratio for the single photoelectron is 4.75 and the dark count rate is?7kHz燼t the threshold of 3 mV while the gain is at??07. The transit time spread of a single photoelectron is2.86ns. Generally the performances of this new 20-inch PMT are improved over the old one of R3600.

submitted time 2016-09-13 Hits1469Downloads877 Comment 0

2. chinaXiv:201609.00888 [pdf]

The study of the aging behavior on large area MCP-PMT

WANG Wen-Wen; QIAN Sen; QI Minga XIA Jing-Kai; CHENG Ya-Ping; NING Zhe; LUO Feng-Jiao; HENG Yue-Kun; LIU Shu-Lin; SI Shu-Guang; Sun Jian-Ning; LI Dong; WANG Xing-Chao; HUANG Guo-Rui; TIAN Jing-Shou; WEI Yong-Lin; LIU Hu-Lin; LI Wei-Hua; WANG Xing; XIN Li-Wei
Subjects: Physics >> Nuclear Physics

Aging experiments of a novel type of large area MCP-PMT made by JUNO collaboration were conducted.In these aging experiments, the multi-photoelectron spectrum and single photoelectron spectrum were measured daily,as well as the MCP resistance of the second PMT before and after the experiment. Two PMTs were aged successivelyfor cross check. The first PMT was aged for 52 days, while the other one was aged for 84 days. In order to study the mechanism of the aging process, the high voltage on the second PMT was increased to accelerate its aging process when the cumulative output of charge from its anode was about 4 C. From our study, it can be known that large area MCP-PMT aging had a strong relationship with the related MCPs. In accordance with the PMT aging curve,a PMT aging model was setup and a general aging formula was given.

submitted time 2016-09-13 Hits1522Downloads892 Comment 0

3. chinaXiv:201609.00002 [pdf]

The test of the electronics system for the BESIII ETOF upgrade

WANG Xiao-Zhuang; DAI Hong-Liang; WU Zhi; HENG Yue-Kun; Zhang Jie; CAO Ping; JI Xiao-Lu; Li Cheng; SUN Wei-Jia; WANG Si-Yu; WANG Yun
Subjects: Physics >> Nuclear Physics

It is proposed to upgrade the endcap time-of-flight (ETOF) of the Beijing Spectrometer III (BESIII) with multi-gap resistive plate chamber (MRPC), aiming at overall time resolution about 80 ps. After the entire electronics system is ready, some experiments, such as heat radiating, irradiation hardness and large-current beam tests,are carried out to certify the electronics' reliability and stability. The on-detector test of the electronics is also performed with the beam at BEPCII E3 line, the test results indicate that the electronics system fulfills its design requirements.

submitted time 2016-09-01 Hits2041Downloads1044 Comment 0

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