Saxena Shefali, Paskvan Daniel R, Weir Nicholas R, Sinclair Nicholas
Advanced Photon Source, Argonne National Laboratory, Lemont, Illinois 60439, USA.
Dynamic Compression Sector, Institute for Shock Physics, Washington State University, Argonne, Illinois 60439, USA.
Rev Sci Instrum. 2022 Apr 1;93(4):043005. doi: 10.1063/5.0081205.
A field programmable gate array (FPGA)-based timing and trigger control system has been developed for the Dynamic Compression Sector (DCS) user facility located at the Advanced Photon Source (APS) at Argonne National Laboratory. The DCS is a first-of-its-kind capability dedicated to dynamic compression science. All components of the DCS laser shock station-x-ray choppers, single-shot shutter, internal laser triggers, and shot diagnostics-must be synchronized with respect to the arrival of x rays in the hutch. An FPGA synchronized to the APS storage ring radio frequency clock (352 MHz) generates trigger signals for each stage of the laser and x-ray shutter system with low jitter. The developed FPGA-based control system was the first system used to control the laser and the shutter system since its commissioning, and it has been developing since then to improve the timing jitter. The system is composed of a Zynq FPGA, a debug card, line drivers, and a power supply. The delay and offsets of the trigger signals can be adjusted by using a user-friendly graphical user interface with high precision. The details of the system architecture, timing requirements, firmware, and software implementation along with the performance evaluation are presented in this paper. The system offers low timing jitter (15.5 ps rms) with respect to the APS 352 MHz clock, suitable for the 100 ps (FWHM) x-ray bunch duration at the APS.
已为位于阿贡国家实验室先进光子源（APS）的动态压缩扇区（DCS）用户设施开发了一种基于现场可编程门阵列（FPGA）的定时和触发控制系统。DCS是一种首创的专门用于动态压缩科学的设施。DCS激光冲击站的所有组件——X射线斩波器、单次快门、内部激光触发器和发射诊断设备——必须相对于实验室内X射线的到达进行同步。一个与APS存储环射频时钟（352 MHz）同步的FPGA以低抖动为激光和X射线快门系统的每个阶段生成触发信号。自调试以来，所开发的基于FPGA的控制系统是第一个用于控制激光和快门系统的系统，从那时起一直在不断改进以降低定时抖动。该系统由一个Zynq FPGA、一个调试卡、线路驱动器和一个电源组成。触发信号的延迟和偏移可以通过使用用户友好的图形用户界面进行高精度调整。本文介绍了系统架构、定时要求、固件和软件实现的详细信息以及性能评估。该系统相对于APS 352 MHz时钟具有低定时抖动（均方根值为15.5 ps），适用于APS的100 ps（半高宽）X射线脉冲串持续时间。
