Design and performance of the LLRF system for CSNS/RCS

LI Xiao; SUN Hong; LONG Wei; ZHAO Fa-Cheng; ZHANG Chun-Lin

doi:10.1088/1674-1137/39/2/027002

Chinese Physics C> 2015, Vol. 39> Issue(2) : 027002 DOI: 10.1088/1674-1137/39/2/027002

Design and performance of the LLRF system for CSNS/RCS

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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.

References

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WANG Sheng et al. Chin. Phys. C, 2009, 33(Suppl. II): 1-3[2] WEI J et al. Nucl. Instrum. Methods A, 2009, 600: 10-13[3] SUN Hong et al. IPAC, 2013. 2765-2767[4] LI Xiao et al. IPAC, 2013. 2977-2979[5] LI Xiao. Study on the Digital Low Level RF Control System of CSNS/RCS (PhD Thesis). Beijing: Graduate University of Chinese Academy of Sciences, 2010 (in Chinese)[6] Tamura F et al. PAC, 2005. 3624-3626[7] LI Xiao et al. High Power Laser and Particle Beams, 2013, 25(10): 2671-2674 (in Chinese)

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LI Xiao, SUN Hong, LONG Wei, ZHAO Fa-Cheng and ZHANG Chun-Lin. Design and performance of the LLRF system for CSNS/RCS[J]. Chinese Physics C, 2015, 39(2): 027002. doi: 10.1088/1674-1137/39/2/027002

LI Xiao, SUN Hong, LONG Wei, ZHAO Fa-Cheng and ZHANG Chun-Lin. Design and performance of the LLRF system for CSNS/RCS[J]. Chinese Physics C, 2015, 39(2): 027002. doi: 10.1088/1674-1137/39/2/027002 shu

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Received: 2014-04-09
Revised: 1900-01-01

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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Design and performance of the LLRF system for CSNS/RCS

Corresponding author: LI Xiao,

Received Date: 2014-04-09

Accepted Date: 1900-01-01

Available Online: 2015-02-05

Abstract: 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.

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Design and performance of the LLRF system for CSNS/RCS

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