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- W4386002635 abstract "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." @default.
- W4386002635 created "2023-08-20" @default.
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- W4386002635 date "2023-11-01" @default.
- W4386002635 modified "2023-10-12" @default.
- W4386002635 title "MCP-PMT quantum efficiency monitoring and operation status of the TOP counter at the Belle II experiment" @default.
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- W4386002635 doi "https://doi.org/10.1016/j.nima.2023.168627" @default.
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