HIAF iLinac 事件时序触发系统设计与运行验证
Design and Operational Validation of the HIAF iLinac Event Timing Trigger System
摘要
针对强流重离子加速器装置（HIAF）注入直线加速器（iLinac）在 BRing 注入、T31 供束及直线段调束中的不同事件来源与输出许可需求，研制了基于 White Rabbit 的多模式事件时序触发系统。系统采用三级分层结构，将三种模式的时间信息统一为目标触发时刻，由设备侧 FPGA 完成许可判定及通道调度，实现模式一键切换与延时、脉宽独立调节。现场测试中，1 Hz 和 5 Hz 工况下 Chopper 输出周期标准差分别为 400.06 ns 和 62.645 ns；仪器累计 44136 个时间间隔误差（TIE）样本的标准差为 90.649 ps。LLRF 相对 Chopper 的延时及脉宽响应与设定一致，T31 许可有效时许可监测信号与 Chopper 输出保持周期对应。结果表明，系统在所测条件下实现了百皮秒量级的节点输出稳定性，已用于 HIAF iLinac 现场运行并通过工程验收。
Abstract
A multimode event timing trigger system based on White Rabbit was developed for the injection linear accelerator (iLinac) of the High Intensity Heavy-ion Accelerator Facility (HIAF) to accommodate different event sources and output permission conditions during BRing injection, beam delivery to T31, and linac beam tuning. The system employs a three-level architecture and represents the timing information of all three modes using a common target trigger time. Device-side FPGAs perform permission checking and channel scheduling, enabling one-click mode switching and independent adjustment of channel delays and pulse widths. In on-site tests, the standard deviations of the Chopper output period were 400.06 ns at 1 Hz and 62.645 ns at 5 Hz. The oscilloscope accumulated 44136 valid time interval error (TIE) samples, with a standard deviation of 90.649 ps. The measured LLRF delay relative to Chopper and its pulse width responded consistently to their settings. When the T31 permit was active, the permit-monitoring signal and Chopper output showed cycle-by-cycle correspondence. These results demonstrate node output timing stability on the hundred-picosecond scale under the tested conditions. The system has been deployed for HIAF iLinac operation and has passed engineering acceptance.关键词
HIAF/White Rabbit/同步触发/时间间隔误差/终端设备条件许可Key words
HIAF/White Rabbit/synchronous triggering/time interval error/terminal equipment permission引用本文复制引用
郭玉辉.HIAF iLinac 事件时序触发系统设计与运行验证[EB/OL].(2026-09-23)[2026-09-26].https://chinaxiv.org/abs/202609.00293.学科分类
加速器
