高密度塑料闪烁体探测器的数据获取系统设计

由中国科学院近代物理研究所承担的塑料闪烁体探测器研究项目,其目标是开展空间粒子探测、重构入射电子轨迹、区分电子和光子、鉴别重离子。为配合该探测器测试工作,设计了一套完备的数据获取电路(DAQ)与上位机软件。DAQ接收4块前端电子学(FEE)板的数据,可完成360路电子学通道的数据读出;接收上位机的控制命令并分发给各FEE;接收探测器的击中信息并产生触发信号;接收FEE的遥测数据并传给上位机。该DAQ与上位机通过USB总线和RS232总线实现实时通信。上位机软件基于LabWindows/CVI软件平台开发,实现对FEE电子学系统的控制、数据读取与保存,以及FEE系统运行状态参数信息的实时显示。该数据获取系统电路结构紧凑、功能完善,上位机软件具有良好的人机交互界面。经现场实际运行,DAQ与上位机软件满足设计要求,目前已成功应用于塑料闪烁体探测器读出电子学测试系统。

Design on Data Acquisition System for High Density Plastic Scintillator Detector

The project developing a plastic scintillator detector, undertaken by the Institute of Modern Physics, Chinese Academy of Sciences, is targeted for detection of space particles, reconstructing tracks of incident electron, distinguishing electrons and photons, and identifying heavy ions. In order to construct a test system for the detector, a complete set of data acquisition circuit (DAQ) and upper computer software for test control and date acquisition was designed. The DAQ can receive the data from four front-end electronics (FEE) boards, and complete the data readout of 360 electronics channels on the FEE boards. The DAQ also received the control commands from the upper computer and distributed them to FEEs, received the hit information from the detector and generated trigger signals, and collected the telemetric data of FEEs and sent them to the upper computer for processing after packing. The real-time communication between DAQ and upper computer was achieved via USB bus and RS232 bus. The software of upper computer was developed based on the LabWindows/CVI framework, which can implement the control of FEEs, read and storage of the data from FEEs, and the display of the operation state parameters and other information of FEEs on real time. The system was developed with a compact circuit structure and multiple functions, and the upper computer software has a good human-computer interaction interface. After operation and test practically, the performances of DAQ and upper computer software meet the design requirements, and the system has been applied successfully in the plastic scintillator detector and read-out electronics currently.