【作者】 李道武； 章志明； 张天保； 王宝义； 魏龙；

【Author】 LI Dao-wu,ZHANG Zhi-ming,ZHANG Tian-bao,WANG Bao-yi,WEI Long(Institute of High Energy Physics,CAS,Beijing 100039,China; Sichuan University,Chengdu of Sichuan Prov.610064,China)

【机构】 中国科学院高能物理研究所；

【摘要】 介绍一种从光电倍增管倍增极引出快信号的电路。分析了信号的产生机理,并研究了它的定时性能。使用两支Philipe XP2020Q光电倍增管,与BaF2闪烁体组成时间谱仪探头,从D9倍增极引出快信号,在使用ORTEC 935恒比定时和ORTEC 567时幅转换的条件下,测量60Co的瞬发时间谱,在2:1能窗下得到FWHM=138ps的时间分辨。表明,此方法明显改善了谱仪的时间分辨性能。更多还原

【Abstract】 A circuit for taking out timing signal from one dynode of photomuldplier is described. The dynode signal generation principle is analyzed and its timing characteristic studied. This positron lifetime spectrometer consists of a pair of BaF2 scintillators coupled to PHILIPS photomultipliers XP2020Q and related electronics, which is a fast-slow coincidence system using ORTEC 935 CFD, ORTEC 567 TAC etc. The best timing resolution recorded at 2:1 energy window by 60Co is 138ps in the way the fast timing signal is taken from dynode 9. Comparing with other methods, it improves the timing resolution of spectrometer very much.更多还原