强流重离子RFQ加速器高频反馈控制研究

Research on Radio Frequency Feedback Control of High Intensity Heavy Ion RFQ Accelerator

低能量强流重离子直线加速器装置(LEAF)是一台面向核天体物理、原子物理与材料辐照等多学科研究的强流高电荷态重离子直线加速器,由中国科学院近代物理研究所承担建设。LEAF强流离子束加速主要通过一台四翼型连续波RFQ实现,为实现其腔体各种复杂工况下的频率、幅度及相位的稳定控制,高频控制系统采用数字化低电平的方案。此低电平系统针对LEAF-RFQ的特殊要求开发了自动跟踪频率、双路功率源驱动、混合离子束快速切换相位等独特功能,实现了稳定地载束运行。同时,利用上位机程序实现了腔体的一键自动操作。

LEAF(Low Energy high intensity highly charged ion Accelerator Facility)built by the Institute of Modern Physics,Chinese Academy of Sciences,is a high intensity highly charged heavy ion linear accelerator complex for multi-discipline researches such as low energy nuclear astrophysics,atomic physics,material irradiation physics,etc.The main part of the LEAF accelerator is a 4-vane RFQ.To achieve stable control of the cavity frequency,Radio Frequency(RF)amplitude and phase,the RF control system uses the scheme of digital low levels.According to the special requirements of LEAF-RFQ,this low-level system develops unique functions such as automatic frequency tracking,dual port drive for high power RF amplifier,and rapid phase switching of mixed ion beams,and realizes stable beam commissioning.Meanwhile,the one-click automatic RF power loading and closed loop of the cavity are realized by using the code development.