Improvement of the MCP-PMT Performance Under a High Count Rate
A square shape micro-channel-plate photomultiplier tube (MCP-PMT) was developed for the Belle II TOP counter, where the count rate of the MCP-PMT is as high as several MHz/PMT due to the accelerator beam backgrounds. A major problem of the MCP-PMT in such an environment is depression of the quantum efficiency along with the integrated amount of output charge. We succeeded in diminishing the depression significantly by introducing an atomic layer deposition technique and some other processes in the production of the MCP-PMT.
KeywordsMCP-PMT Photocathode QE Lifetime ALD
This work was supported by MEXT Grant-in-Aid for Scientific Research on Innovative Areas “Elucidation of New Hadrons with a Variety of Flavors” and JSPS Grant-in-Aid for Scientific Research (S) “Probing New Physics with Tau-Lepton” (No. 26220706).
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