摘要: The low level radio frequency (LLRF) system for booster accelerator at Shanghai Synchrotron Radiation Facility (SSRF) was upgraded by a digital controller based on field programmable gate array (FPGA) technology. Parameters of voltage, frequency and field flatness in the two 5-cell cavities are controlled to meet the requirements of booster. In this article, the ramping curve of cavity voltage, amplitude and phase control loop with vector sum of the two 5-cell cavities, tuning loop and field flatness loop are analyzed and discussed in detail. A different method in tuning loop is adopted due to the limitations of ADC channels. The function realizes energy ramping of electron beam from 150 MeV to 3.5 GeV with a repetition rate of 2 Hz. With the new LLRF controller, the phase stability at ramping mode in 10 hours long operation is improved from � 1.5� (RMS) with open loop to � 0.15� (RMS) with close loop, while the detuning phase and field flatness are maintained to within � 2癮nd � 1%, respectively.
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期刊:
Nuclear Science and Techniques
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分类:
核科学技术
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粒子加速器
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投稿状态:
已在期刊出版
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引用:
ChinaXiv:202306.00283
(或此版本
ChinaXiv:202306.00283V1)
DOI:dx.doi.org/10.13538/j.1001-8042/nst.26.030106
CSTR:32003.36.ChinaXiv.202306.00283.V1
- 推荐引用方式:
ZHANG Zhi-Gang,ZHAO Yu-Bin,XU Kai,ZHENG Xiang,LI Zheng,ZHAO Shen-Jie,CHANG Qiang,HOU Hong-Tao,MA Zhen-Yu,LUO Chen,MAO Dong-Qing,SHI Jing,WANG Yan,LIU Jian-Fei.(2023).Digital LLRF controller for SSRF booster RF system upgrade.Nuclear Science and Techniques.doi:dx.doi.org/10.13538/j.1001-8042/nst.26.030106
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