Design and performance of the LLRF system for CSNS/RCS

The rapid cycling synchrotron （RCS） is part of the China Spallation Neutron Source （CSNS）. The RCS provides 1.6 GeV protons with a repetition rate of 25 Hz. The RF system in RCS is mainly composed of a ferrite loaded RF cavity, a high power tetrode amplifier, a bias supply of 3300 A and a digital lo...

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Published in中国物理C：英文版 no. 2; pp. 65 - 69
Main Author 李晓 孙虹 龙巍 赵发成 张春林
Format Journal Article
LanguageEnglish
Published 2015
Subjects
FPGA
RCS
RF系统
功率四极管
动态性能
同步加速器
散裂中子源
设计
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Summary:The rapid cycling synchrotron （RCS） is part of the China Spallation Neutron Source （CSNS）. The RCS provides 1.6 GeV protons with a repetition rate of 25 Hz. The RF system in RCS is mainly composed of a ferrite loaded RF cavity, a high power tetrode amplifier, a bias supply of 3300 A and a digital low level RF （LLRF） system based on FPGA. The major challenge of the LLRF system is to solve problems caused by rapid frequency sweeping and the heavy beam loading effect. A total of eight control loops are applied to ensure the normal operation. An effective feedforward scheme is widely used to improve the dynamic performance of the system. The design of the LLRF system and high power integration test results with the prototype RF system are presented.
Bibliography:LI Xiao,SUN Hong, LONG Wei,ZHAO Fa-Cheng, ZHANG Chun-Lin（ Institute of High Energy Physics Dongguan Campus, Chinese Academy of Sciences, Dongguan 523803, China）
11-5641/O4
LLRF, CSNS, RCS, RF
The rapid cycling synchrotron （RCS） is part of the China Spallation Neutron Source （CSNS）. The RCS provides 1.6 GeV protons with a repetition rate of 25 Hz. The RF system in RCS is mainly composed of a ferrite loaded RF cavity, a high power tetrode amplifier, a bias supply of 3300 A and a digital low level RF （LLRF） system based on FPGA. The major challenge of the LLRF system is to solve problems caused by rapid frequency sweeping and the heavy beam loading effect. A total of eight control loops are applied to ensure the normal operation. An effective feedforward scheme is widely used to improve the dynamic performance of the system. The design of the LLRF system and high power integration test results with the prototype RF system are presented.
ISSN:1674-1137
0254-3052