Subjects: Physics >> Nuclear Physics submitted time 2016-09-13
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
Abstract： 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.
Peer Review Status:
Awaiting Review
Subjects: Physics >> Nuclear Physics submitted time 2016-09-13
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
Abstract： 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.
Peer Review Status:Awaiting Review
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