Automatic test system for progressive gain of dynode photomultiplier tube北大核心CSCD

逐级增益是评价打拿极光电倍增管（photomultiplier tube, PMT）性能的重要参数之一，目前国内仅有一台逐级增益测试系统，依靠人工操作，测试效率不高。为提高逐级增益测试效率，设计了一套打拿极PMT逐级增益自动测试系统。该系统使用由可控光阑、电动挡板等组成的自动光源实现光源输出强度连续可调，并通过控制高压模块、分压器模块和继电器模块实现逐级电压的通断。利用精度为0.01 nA的电流计模块完成信号的采集、处理和传输，实现对逐级增益的自动测量。实验证明，该系统可有效测量打拿极PMT的逐级增益特性，测试重复性在2%以内，满足测试需求。

Automatic test system for progressive gain of dynode photomultiplier tube

Progressive gain is one of the important parameters for evaluating the performance of dynode photomultiplier tube (PMT), but there is only one related test system at home, which relies on manual operation and the test efficiency is not high. In order to improve the efficiency of testing progressive gain, an automatic test system for the progressive gain of dynode PMT was designed. The continuous adjustment of the light source output intensity was achieved by an automatic light system composed of controllable disphragm, electric baffle and etc, and the on-off of the progressive voltage was controlled by the high-voltage module, the voltage divider module and the relay module. Finally, based on the galvanometer module with an accuracy of 0.01 nA, the acquisition, processing and transmission of the signal was completed, so as to realize the automatic measurement of the progressive gain. The experimental results show that the proposed system can effectively measure the progressive gain characteristics of the dynode PMT, and the test repeatability is within 2%, which meets the test requirements.