冷却储存环外靶γ球子触发系统设计

Design and implemention of sub-trigger system for CSR external target γ detection

介绍了兰州重离子加速器冷却储存环(Heavy Ion Research Facility at Lanzhou-Cooling Storage Ring,HIRFL-CSR)外靶实验子触发判选系统的设计,该系统可实现对外靶实验中γ球探测器输出信号的筛选从而保证后续的物理分析可以高效进行。系统基于Flash型现场可编程逻辑门阵列(Field Programmable Gate Array,FPGA)研制,主要是对光口模块和以太网模块进行设计,分别用来实现与总触发判选系统的通信和与上位机的信号传输。目前已完成实验室电子学测试,测试结果能够满足当前子触发系统满足外靶实验需求。

[Background] The gamma detection array is an important device in the heavy ion research facility at Lanzhou-cooling storage ring(HIRFL-CSR). In order to eliminate invalid information such as background noise in the experiment, to ensure that subsequent physical analysis can be performed efficiently, a sub-trigger selection system needs to be designed for CSR external target γ detection array. [Purpose] This study aims to design aforementioned sub-trigger system for selectable interesting signal in the events recorded by the gamma detector.[Methods] Based on flash-based field programmable gate array(FPGA), this sub-trigger system mainly consisted of the optical fiber interface and the Ethernet interface. The former was used for signal transmission with global trigger and system, and the latter was used to communicate with host computer. Experimental tests were carried out to evaluate the performance of the sub-trigger system. [Results & Conclusions] The test results show that this subtrigger system is suitable for external target experiment.