MCP-PMT quantum efficiency monitoring and operation status of the TOP counter at the Belle II experiment

被引：0

作者：

Okubo, Ryogo ^{[1
]}

机构：

[1] Nagoya Univ, Grad Sch Sci, Nagoya, Aichi 464860, Japan

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT | 2023年 / 1056卷

关键词：

Belle II; Particle identification; Cherenkov detector; Time of propagation; Microchannel plate photomultiplier tubes;

D O I：

10.1016/j.nima.2023.168627

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

The Belle II experiment is a high luminosity electron and positron collider experiment at SuperKEKB in Japan. The Time-Of-Propagation counter is a detector for particle identification in the barrel region. Micro-channel -plate photomultipliers are used as photodetectors and measure photon timing with a resolution of 30 ps; this leads to excellent particle identification performance. One of the issues is the photocathode lifetime of the photomultiplier tubes. Monitoring tools have been developed to measure the tube gain, accumulated output charge density and quantum efficiency during physics data taking. The gain was seen to decrease by about 10%. Although the accumulated output charge density is small compared to the tube expected lifetime, a quantum efficiency degradation was found larger than expected for 5% of the tubes after threshold efficiency calibration. Several causes for this degradation are being investigated. They can possibly be related to tube production and noise from the read-out system.

引用

页数：3

共 6 条

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