强激光与粒子束2025，Vol.37Issue(9)：52-59,8.DOI:10.11884/HPLPB202537.250106
硬X射线自由电子激光装置聚束器低电平控制研究
Study on low-level control of buncher in hard X-ray free electron laser facility
摘要
Abstract
[Background]In the hard X-ray free electron laser(Shanghai high repetition rate XFEL and extreme light facility,SHINE),the normal-conducting L-band buncher plays a critical role in the compression of electron bunches,significantly improving beam quality and meeting the stringent injection requirements of low emittance and low energy spread.[Purpose]Due to its 2-cell structure,a dedicated digital low-level RF control system was developed.[Methods]This system,based on an architecture comprising FPGA and RF front-end boards,and adopts I/Q demodulation techniques.It incorporates amplitude and phase feedback,frequency tuning,and multi-motor coordination for field flatness control.[Results]During 10 kW continuous-wave(CW)operation,the amplitude stability(peak-to-peak)improved from±0.17%in open-loop mode to within±0.03%under closed-loop mode,while the phase stability(peak-to-peak)was controlled within±0.05°,and field flatness was maintained within±2%,fully meeting design specifications.Additionally,a radio-frequency(RF)power calibration method based on ADC acquisition of LLRF was proposed.[Conclusions]Experimental results showed calibration error was within±2%when compared with a power meter,demonstrating reliability of this method as an alternative solution for RF power calibration.关键词
X射线自由电子激光/数字低电平/聚束器/腔压稳定度/功率校准Key words
X-ray free electron laser/digital low-level radio frequency/buncher/cavity voltage stability/power calibration分类
能源科技引用本文复制引用
张志刚,郑湘,赵玉彬,杨文峰,蒋鸿儒,徐凯,黄雪芳,余悦超,武海龙,吴宏,常强..硬X射线自由电子激光装置聚束器低电平控制研究[J].强激光与粒子束,2025,37(9):52-59,8.基金项目
国家大科学装置项目 （）
