单光电子谱测试中触发方式对比研究

摘要

光电倍增管( PMT)单光电子谱测试中触发方式的对比研究对PMT性能刻度具有很强的指导意义。通过搭建自触发、同步触发、异步触发三套测试系统，对比研究不同触发方式对PMT性能刻度的影响。实验结果表明：自触发只可用于初步性能刻度；而异步触发在信号触发频率小于触发门采样频率时，得到多光电子谱，刻度结果远偏离实际值；同步触发方式能更可靠地刻度出更多更精确的PMT参数，是PMT性能刻度的最佳触发方式。%Comparative study of different trigger algorithms for photomultiplier tube ( PMT) single photoelectron ( SPE) spectrum measurements makes significant sense to guide its application. In the content, totally 3 algo-rithms of self-trigger, synchronous trigger and asynchronous trigger are tested. The results show that:the self-trigger can only be used for preliminary performance scale;if the frequencies of signal less than the frequen-cies of trigger in asynchronous trigger, spectrum obtained is multiple photoelectron spectrum and the result is far from the actual value;the synchronous trigger is the effective way to get more accurate performance of PMT and is also the best way for SPE measurement.