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在惯性约束聚变(Inertial Confinement Fusion,ICF)实验中,为诊断等离子体区域温度信息,需要通过中子飞行时间法测量中子的能谱,即转化为对探测器的输出信号相对于激光同步脉冲的延迟时间进行精确测量。本文介绍了一种对中子飞行时间进行高精度测量的设计方案,该方案采用恒比定时方法(Constant Fraction Discriminator,CFD)对探测器输出信号进行定时,并利用德国ACAM公司生产的TDC-GP21芯片进行精确时间测量。基于该方案完成的测量电路电子学分辨时间在1 500 ns量程内均优于200 ps。同时,其电子学分辨时间加上探测器分辨时间典型测量结果为217.5 ps。
In the Inertial Confinement Fusion (ICF) experiments, the neutron time-of-flight spectroscopy is used to measure the temperature information of the plasma region to convert the energy spectrum of the neutron detector to the output signal of the detector relative to the laser sync pulse Of the delay time for accurate measurement. This paper presents a design scheme of high precision measurement of neutron flight time. The scheme uses Constant Fraction Discriminator (CFD) to time-out the detector output signal and utilizes the TDC-GP21 Chip for accurate time measurement. The resolution of the measurement circuit based on this scheme was better than 200 ps over the 1 500 ns range. At the same time, its electronic resolution time plus detector resolution typical measurement was 217.5 ps.