超快中子探测器闪烁体性能计算
Performance calculation of ultra fast neutron scintillator
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摘要: 超快中子探测器是ICF聚变反应速率测量系统的核心部件。利用蒙特卡罗粒子输运工具包Geant4模拟了一种超快中子探测器——BC-422型闪烁探测器的中子探测过程，计算出了几种厚度的BC-422型闪烁体的探测效率、输出光信号强度和时间分辨力；对比了闪烁体的2种不同反射表面对输出光信号强度和时间分辨力的影响。计算的结果显示：设计适当的BC422型闪烁探测器能够测量的最低中子产额在108量级，对DT中子的信号时间分辨力好于20 ps，对DD中子的信号时间分辨力达到30 ps，能够用于大型激光装置及其原型的聚变反应速率测量。Abstract: The ultra fast neutron detector is the key device in ICF fusion reactionrate measure system. The performance of the ultra fast neutron scintillator BC-422 was simulated using Geant4 code system. The detection efficiency, temporal resolution and signal intensity of BC-422 with different thickness were calculated. The temporal resolution and signal intensity of BC-422 cladded with two kinds of reflection surfaces were compared. The results show that the properly designed BC-422 scintillator can perform well above 108 neutron yield, and its temporal resolution is better than 20 ps for DT fusion neutron, and 30 ps for DD fusion neutron. The BC-422 scintillator is applicable to the fusion reaction-rate measure system for a large-scale laser facility and its prototype requiring tens of ps-scal
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