Performance of the MCP-PMT for the Belle II TOP counter in a magnetic field
Performance of the MCP-PMT for the Belle II TOP counter in a magnetic field
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DOI：
10.1016/j.nima.2014.05.012
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发表时间：
2014-12
影响因子：
1.4
通讯作者：
S. Hirose
中科院分区：
文献类型：
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作者：
S. Hirose
传播时间计数器是贝儿Ⅱ实验中一种新型的粒子识别装置，它利用环形成像切伦科夫技术。它由一个2.7 m长的石英棒和32个连接在棒端的微通道板光电倍增管（MCP-PMT）组成。MCP-PMT具有28%的典型量子效率，约55%的光电子收集效率，以及对于单光子检测小于50 ps的渡越时间扩展（TTS）。由于TOP计数器安装在贝儿II探测器的1.5 T磁场中，因此要求MCP光电倍增管在磁场中保持5× 105以上的增益特性。因此，我们研究了磁场中的MCP-光电倍增管的增益，TTS和单光子探测效率，发现它们满足要求。我们正在对500多台MCP-PMT进行全面检查，并已检查了87台MCP-PMT。
The time of propagation (TOP) counter is a novel particle identification device for the Belle II experiment, utilizing the ring imaging Cherenkov technique. It is composed of a 2.7 m long quartz bar and 32 micro channel plate photomultiplier tubes (MCP-PMTs) attached on the end of the bar. The MCP-PMT has a typical quantum efficiency of 28%, a photoelectron collection efficiency of about 55%, and a transit time spread (TTS) less than 50 ps for single photon detection. Since the TOP counters are installed in the 1.5 T magnetic field of the Belle II detector, the MCP-PMTs are required to keep those characteristics with gain of more than 5×105in the magnetic field. Therefore, we investigated gain, TTS, and single photon detection efficiency of the MCP-PMTs in the magnetic field and found that they satisfy the requirements. We are starting complete inspections for more than 500 MCP-PMTs, and have inspected up to 87 MCP-PMTs.