中子闪烁探测器前端电子学的抗饱和改进  

Anti-saturation improvement of front-end electronics for neutron detectors array system

作　　者：李锋[1] 江晓[1] 林成生[1] 陈炼[1] 梁福田[1] 金革[1] 

机构地区：[1]中国科学技术大学安徽省物理电子学重点实验室,合肥230026

出　　处：《强激光与粒子束》2009年第2期291-296,共6页High Power Laser and Particle Beams

基　　金：国家高技术发展计划项目;博士点基金项目资助(20050358047)

摘　　要：ICF实验会产生大量X射线和γ射线,其在光电倍增管(PMT)中产生的脉冲信号过大,导致前端电子学电路饱和,严重影响电路的正常工作和中子飞行时间的测量。结合前端电子学系统的结构,对电路饱和的原因进行了深入分析,提出了非线性抗饱和电路改进方案,并进行了仿真和实验研究。仿真结果表明,该设计方案能够大幅衰减大信号而确保小信号的通过,信号通过后电路基线能在35 ns内恢复;电路的实测结果与仿真结果基本相同。这表明:采取的方案简洁有效,能够确保输入高达数十V脉冲的情况下电路的正常工作。目前这一电路已经得到应用,并将安装在某大型激光原型的大阵列中子探测器上。The too strong pulse from a photomultiplier tube, produced by X-rays and gamma rays generated in the ICF experiment, leads to the saturation of the front-end electronics. It impedes normal circuit operation and measurement of the flight time of neutrons. An improved anti-saturation nonlinear circuit has been put forward and tested on the basis of the front-end electronics structure and further analysis of its saturation. Simulation results indicate that the improved circuit could introduce great attenuations for large amplitude pulses and pass through small amplitude pulses. The baseline of the circuit can recover within 35 ns. The experimental test has got the same results as the simulation does. It shows that the improved solution is simple and effective, and it could ensure the normal circuit operation for input pulses with dozens of volts. Now the circuit has been applied to the frontend electronics and will be installed on the large neutron detector array of certain large laser prototype soon.

关 键 词：ICF 前端电子学 抗饱和 闪烁探测器 

分 类 号：TL82[核科学技术—核技术及应用]