| Abstract: | A trigger system was designed for the external target experiment in the Cooling Storage Ring(CSR)of the Heavy Ion Research Facility in Lanzhou(HIRFL).Considering that different detectors are scattered over a large area,the trigger system is designed based on a master-slave structure and fiber-based serial data transmission technique.The trigger logic is organized in hierarchies,and flexible reconfiguration of the trigger function is achieved based on command register access or overall field-programmable gate array(FPGA) logic on-line reconfiguration controlled by remote computers.We also conducted tests to confirm the function of the trigger electronics,and the results indicate that this trigger system works well. |
