强激光与粒子束2026，Vol.38Issue(4)：97-104,8.DOI:10.11884/HPLPB202638.250282
超紧凑回旋加速器数字化低电平控制算法设计及验证
Design and verification of digital low-level RF control algorithms for an ultra-compact cyclotron
摘要
Abstract
[Background]The China Institute of Atomic Energy has designed of a 9.5 MeV ultra-compact cyclotron to support the independence of Positron Emission Tomography(PET)cyclotrons.A high-performance control system is critical for the equipment,as the stability of the acceleration field directly impacts beam quality.[Purpose]In order to ensure the stable acceleration of the accelerator beam,this study aims to develop a Low-Level Radio Frequency(LLRF)control algorithm based on a fully digital hardware platform.[Methods]To enhance control precision and increase the feedback rate,a high-speed Digital Down-Conversion(DDC)demodulation system was designed.Addressing the issue where the IQ sequence after digital down-conversion may be distributed in arbitrary quadrants,an innovative quadrant preprocessing module was developed to extend applicability across the Cartesian plane.A position-type Proportion-Integral-Derivative(PID)tuning loop was implemented for automatic frequency compensation,integrating adaptive protection,timed detection,and one-click startup.Furthermore,a robust cross-clock-domain data path was constructed to ensure accurate and stable amplitude regulation.[Results]Closed-loop tests verified the reliability of the demodulation system.During the joint commissioning with the accelerator,a stable internal target beam current of 100 μA was successfully extracted.The system achieved a cavity voltage amplitude stability of 0.047%(RMSE)and maintained a detuning angle of 0.46°(RMSE).[Conclusion]The experimental results demonstrate that the proposed LLRF system fully meets the control requirements of the accelerator.The design ensures high stability and precision,providing reliable technical support for the operation of the 9.5 MeV ultra-compact cyclotron.关键词
回旋加速器/高频低电平控制系统/FPGA/闭环控制/跨时钟域Key words
cyclotron/LLRF/FPGA/closed-loop control/cross-clock domain分类
能源科技引用本文复制引用
吴继敏,李贤平,黄鹏,魏俊逸,管锋平,纪彬,张庭锋,张嘉怡,孙昊,王亚晴..超紧凑回旋加速器数字化低电平控制算法设计及验证[J].强激光与粒子束,2026,38(4):97-104,8.基金项目
国家自然科学基金项目(12205379) （12205379）
