地磁场下微通道板型光电倍增管性能研究

Performance of the Microchannel Plate Type Photomultiplier Tube Under a Geomagnetic Field

通过基于电子学取数的测试系统,在地磁场环境对两种不同聚焦级结构的微通道板型光电倍增管(microchannel plate type photomultiplier tubes,MCP-PMT)进行了各项性能测试,例如单光电子谱、后脉冲、渡越时间涨落、信号上升下降时间、收集效率等。并通过改变光电倍增管与地磁场的相对位置,测得不同角度下MCP-PMT的性能,并且经对比屏蔽磁场条件下与地磁场环境下MCP-PMT的性能,定性分析了地磁场对MCP-PMT的性能影响。

Using the electronic data acquisition system,various performance tests of microchannel plate type photomultiplier tubes(MCP-PMT)at different focus levels were performed in the geomagnetic environment,such as single photoelectron spectrum and after pulse,transit time fluctuations,signal rise and fall time,collection efficiency and so on.By changing the relative position of the photomultiplier tube and the geomagnetic field,the performance of the MCP-PMT at different angles was measured,and the geomagnetic field was qualitatively analyzed by comparing the performance of MCP-PMT under the shielding magnetic field and geomagnetic field.