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<p>A dual-harmonic acceleration system is utilized to mitigate the space-charge effect in the rapid-cycling synchrotron of the China Spallation Neutron Source upgrade project (CSNS-II). A magnetic alloy (MA)-loaded cavity with a high accelerating gradient is developed to satisfy the requirements of dual-harmonic acceleration and provide the necessary second-harmonic cavity voltage. However, the MA-loaded cavity exhibits a wideband frequency response, resulting in numerous higher harmonics in the radio-frequency (RF) voltage. These higher harmonics are caused by both the beam-loading effect and distorted amplifier current, which distort the RF bucket, increase the power dissipation in the cavity, and lower the gradient. To address these issues, a multiharmonic independent feedback-control approach is implemented to compensate for higher harmonics. The effectiveness of this control strategy is validated experimentally. This study provides details regarding the feedback-control design and presents the commissioning results.</p>

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Design and verification of a new multiharmonic feedback control system for CSNS-II RCS

  • 期刊论文

  • 发表日期：

    2025年2月25日

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  • Jian Wu,
  • Xiang Li,
  • Bin Wu,
  • Yang Liu,
  • Chun-Lin Zhang,
  • Wei Long,
  • Jun-Yu Zhu,
  • Sheng-Hua Liu,
  • Zhi-Jun Lu,
  • Sheng-Yi Chen,
  • Xiao Li

摘要

A dual-harmonic acceleration system is utilized to mitigate the space-charge effect in the rapid-cycling synchrotron of the China Spallation Neutron Source upgrade project (CSNS-II). A magnetic alloy (MA)-loaded cavity with a high accelerating gradient is developed to satisfy the requirements of dual-harmonic acceleration and provide the necessary second-harmonic cavity voltage. However, the MA-loaded cavity exhibits a wideband frequency response, resulting in numerous higher harmonics in the radio-frequency (RF) voltage. These higher harmonics are caused by both the beam-loading effect and distorted amplifier current, which distort the RF bucket, increase the power dissipation in the cavity, and lower the gradient. To address these issues, a multiharmonic independent feedback-control approach is implemented to compensate for higher harmonics. The effectiveness of this control strategy is validated experimentally. This study provides details regarding the feedback-control design and presents the commissioning results.