A Large Area Dynode-MCP-PMT Design With High CE and Good Time Performance
A Large Area Dynode-MCP-PMT Design With High CE and Good Time Performance
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DOI：
10.1109/tns.2022.3204791
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发表时间：
2022-10
影响因子：
1.8
通讯作者：
Lin Chen;Xingchao Wang;Jianli He;L. Tian;Jinshou Tian;Qilong Wang;Lingbin Shen;Yunji Wang;Dongyan Ding;Ke Ji;Jie Yang
中科院分区：
文献类型：
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作者：
Lin Chen;Xingchao Wang;Jianli He;L. Tian;Jinshou Tian;Qilong Wang;Lingbin Shen;Yunji Wang;Dongyan Ding;Ke Ji;Jie Yang
完全符合标准。本文提出了一种基于微通道板的光电倍增管（dynode - mcp - pmt），具有高收集效率和良好的时间性能。为了获得无尾时间分布，采用了一对未涂覆的mcp。对于高CE，在mcp前面放置一个带有两个大开口的dynode。dynode被设计成球形，以防止次级细胞逃离增殖系统，并帮助它们移动到mcp进行进一步的增殖。利用CST Studio Suite开发了三维模型来验证其可行性。将有限积分技术与蒙特卡罗方法相结合，模拟了光电子的收集和倍增过程。结果预测，对于屏蔽Dynode-MCP-PMT， CE预计为100%。观察到无尾穿越时间分布。光电子从阴极顶点到阴极节点的传输时间扩展（TTS）达到3.7 ns。如果该PMT暴露在地磁场中，则应在南北方向上操作，其中CE和TTS预计分别为100%和3.8 ns。
A 20-in. photomultiplier tube based on dynode and microchannel plates (Dynode-MCP-PMT) with high collection efficiency (CE) and good time performance is proposed in this article. To obtain a tailless time distribution, a pair of uncoated MCPs are employed. For a high CE, a dynode with two large openings is placed in front of the MCPs. The dynode is designed as a spherical shape to prevent secondaries from escaping the multiplication system and assist them moving to the MCPs for further multiplication. A 3-D model is developed by CST Studio Suite to validate its feasibility. Finite integral technique and Monte Carlo method are combined to simulate the photoelectron collection and multiplication processes. Results predict that for the shielded Dynode-MCP-PMT, CE is expected to be 100%. Tailless transit time distributions are observed. Transit time spread (TTS) of the photoelectrons from the cathode top point to the dynode achieves 3.7 ns. If this PMT is exposed to the geomagnetic field, it should be operated in the north and south direction, in which CE and TTS are expected to be 100% and 3.8 ns, respectively.