THGEM位置灵敏探测器读出系统

采用专用集成芯片设计了基于厚气体电子倍增器THGEM的热中子位置灵敏探测器读出电子学系统，实现电荷信号的放大、整形，采用高速模数转换芯片AD9220进行采集，采用USB通信实现数据传输，采用FPGA作为读出系统的总控制器，实现了探测器的阵列电荷信号读出；得到读出系统通道输入输出线性响应关系，在±15 fc之间线性关系良好；实现了位置信息重心读出；探测器最高计数率达1×105/s.
Abstract：Based on THGEM thermal neutron position sensitive detector, a readout electronics system was designed with a specific integrated chip VA64TA2 to realize charge integration, amplification and conversion. Using high-speed analog-to-digital conversion chip AD9220 to realize data sampling, USB communication to realize data transmission, and FPGA as the main controller, the system was constructed. The array charge signal readout of the detector was realized. The channel input-output linear responses of the system are good, between ±15 fc. The centre-of-gravity read-out of position information was realized. The maximum counting rate of the detector could reach 1×105/s.