| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 8175418 | Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment | 2014 | 4 Pages |
Abstract
A square shape multi-anode micro-channel-plate photomultiplier tube (MCP-PMT) was developed for the Belle II TOP counter. It has a 23Ã23Â mm2 multi-alkali photocathode with a peak quantum efficiency (QE) of 28% around a wavelength of 360Â nm. It has a 2Ã106 gain and is capable of detecting a single photon with a transit time spread (TTS) of 40Â ps or less. The QE, gain and TTS were measured for each MCP-PMT to check the quality in the mass production of 550 MCP-PMTs. The lifetime of the MCP-PMT was extended to 10Â C/cm2 by adapting the atomic layer deposition technique for the MCP coating. Other properties of the MCP-PMT are also discussed: the angle and polarization dependence of the QE, and the effects of charge sharing and cross-talk. A prototype TOP counter was tested with a 2Â GeV/c positron beam. The distribution of the time of propagation was consistent with the calculated expectation which included those properties of the MCP-PMT.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Instrumentation
Authors
K. Matsuoka, For the Belle II PID group For the Belle II PID group,