基于现场可编程门阵列的束流快引出控制系统设计

 为实现兰州重离子冷却储存环主环束流的快引出，采用一种基于现场可编程门阵列(FPGA)的引出控制系统。在FPGA单元设计中，采用数字倍频技术来实现对Kicker磁铁在1个高频周期内充放电时间的精度控制。经测试，该控制系统对存储环中运行束流位置的跟踪可调节时间步长为5 ns。当高频频率为1.4 MHz时，在0~360°范围内可实现约2.5°相位精度的Kicker触发。

Fast extraction control system based on field programmable gate array

In order to realize the fast extraction of beam from the HIRFL-CSR(the Heavy Ion Research Facility at Lanzhou-Cooler Storage Ring) main ring,we adopt an extraction system based on FPGA technique.The digital multiplication of clock frequency method is employed in the design of FPGA,to accurately control the charging time and discharging time of Kicker magnet during a high-frequency period.Test results show that the time accuracy of the system reaches 5 ns for beam locating and beam adjusting in the storage ring.At the high-frequency of 1.4 MHz,triggering Kicker can be realized with phase accuracy of 2.5 degree in the scale of 0 to 360 degree.