基于APV25芯片的GEM探测器读出电子学系统的测试与改进

Test and Improvement of Readout System Based on APV25 Chip for GEM Detector

摘要: 气体电子倍增器(GEM)是目前最具发展前景的位置灵敏气体探测器。其新一代读出电子学系统包括APV25前端卡、多用途数字转换器（MPD)、VME控制器及基于Linux的采集软件DAQ。本工作完成了读出系统的调试，获得了系统在40 MHz和20 MHz工作频率下的理想数据。在长时间测试中，系统运行稳定。通过对软件配置的优化和对硬件的改进，降低了噪声水平，提高了信噪比。

Abstract: Gas electron multiplier (GEM) is the most promising position sensitive gas detector. The new generation of readout electronics system includes APV25 front-end card, multi-purpose digitizer (MPD), VME controller and Linux-based acquisition software DAQ. The construction and preliminary test of this readout system were finished, and the ideal data with the system working frequency of 40 MHz and 20 MHz were obtained. The long time running test shows that the system has a very good time-stable ability. Through optimizing the software configuration and improving hardware quality, the noise level was reduced, and the signal noise ratio was improved.