基于GEM工艺的裂变时间投影室性能模拟研究

基于GEM工艺的裂变时间投影室具有探测效率高和空间分辨率高的特点，可实现裂变产物的多参量测量。本文主要研究基于GEM工艺的裂变时间投影室在不同条件下的测量精度，使用Garfield++软件计算得到裂变时间投影室中不同的裂变产物质量数测量误差约为4～6 u，并通过时间信息的径迹重建研究了裂变碎片在不同工作气体中的角度分辨。研究发现，电子漂移时间长的工作气体中，裂变产物具有更好的角度分辨，并可依此在实验中选择合适的工作气体、气压和漂移电场强度来进行裂变碎片的测量。

Research on Performance Simulation of Fission Time Projection Chamber Based on GEM Process

The fission time projection chamber based on GEM process has the characteristics of high detection efficiency and high spatial resolution, which can realize the multi parameter measurement of fission products. The measurement accuracy of fission time projection chamber based on GEM process under different conditions was studied. By using Garfield++ software, the measurement error of the mass of different fission products in the fission time projection chamber was calculated to be about 4 6 u. And through the track reconstruction of time information, the angle resolution of fission fragments in different working gases was studied. It’s found that in working gases with long electron drift time, the fission products have better angular resolution, and the appropriate working gas, gas pressure and drift electric field strength can be selected in the experiment to measure the fission fragments.