利用ICCD定位宇宙线来测量探测器时间分辨的方法研究

The study of time-resolved measurement using ICCD positioning cosmic rays

本研究采用双层150 mm×150 mm闪烁条阵列定位宇宙线的入射和出射位置.阵列信号光使用波移光纤吸收传输,在ICCD相机前插入前置像增强器,使信号光延迟大于200 ns,使ICCD可以由外部高速触发信号控制,有效记录随机触发事例.该宇宙线定位系统可以同时多点密集测量通用探测器测试平台的时间分辨和闪烁光的渡越时间.该新方法与传统时间分辨测量方法相比提高了30倍以上的效率.实验结果显示:时间探测器的时间分辨好于200 ps,满足通用探测器测试平台的设计要求.

Double layers of 150 mm×150 mm plastic scintillator arrays are used to locate the cosmic ray.Both layers of arrays are read out by wavelength-shifting fibers,which are bundled and coupled to image intensifier and ICCD camera.The light signal is delayed more than 200 ns by the image intensifier,so the ICCD can be pre-triggered by an external fast coincident signal.This cosmic ray positioning system is used to measure the time resolution and photon transfer time of the time-of-fly detector for the common test platform based on cosmic ray.Compared with traditional cosmic rays test,the data-taking efficiency of this system increases more than 30 times because of multi-point readout and higher position resolution.The test results show that the time resolution of the time-of-fly detector is better than 200 ps,which satisfies the requirement of the common platform based on cosmic ray.