Impedance measurements of the extraction kicker system for the rapid cycling synchrotron of China Spallation Neutron Source

  • The fast extraction kicker system is one of the most important accelerator components and the main source of impedance in the Rapid Cycling Synchrotron of the China Spallation Neutron Source. It is necessary to understand the kicker impedance before its installation into the tunnel. Conventional and improved wire methods are employed in the impedance measurement. The experimental results for the kicker impedance are explained by comparison with simulation using CST PARTICLE STUDIO. The simulation and measurement results confirm that the window-frame ferrite geometry and the end plate are the important structures causing coupling impedance. It is proved in the measurements that the mismatching from the power form network to the kicker leads to a serious oscillation sideband of the longitudinal and vertical impedance and the oscillation can be reduced by ferrite absorbing material.
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Liang-Sheng Huang, Sheng Wang, Yu-Dong Liu, Yong Li, Ren-Hong Liu and Ou-Zheng Xiao. Impedance measurements of the extraction kicker system for the rapid cycling synchrotron of China Spallation Neutron Source[J]. Chinese Physics C, 2016, 40(4): 047002. doi: 10.1088/1674-1137/40/4/047002
Liang-Sheng Huang, Sheng Wang, Yu-Dong Liu, Yong Li, Ren-Hong Liu and Ou-Zheng Xiao. Impedance measurements of the extraction kicker system for the rapid cycling synchrotron of China Spallation Neutron Source[J]. Chinese Physics C, 2016, 40(4): 047002.  doi: 10.1088/1674-1137/40/4/047002 shu
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Received: 2015-06-29
Revised: 2015-09-21
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    Supported by National Natural Science Foundation of China(11175193, 11275221)

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Impedance measurements of the extraction kicker system for the rapid cycling synchrotron of China Spallation Neutron Source

    Corresponding author: Yu-Dong Liu,
  • 1. Dongguan Campus, Institute of High Energy Physics(IHEP), Chinese Academy of Sciences(CAS), Dongguan 523803, China
  • 2. Dongguan Institute of Neutron Science(DINS), Dongguan 523808, China
  • 3.  Institute of High Energy Physics, Chinese Academy of Science, Beijing 100049, China
Fund Project:  Supported by National Natural Science Foundation of China(11175193, 11275221)

Abstract: The fast extraction kicker system is one of the most important accelerator components and the main source of impedance in the Rapid Cycling Synchrotron of the China Spallation Neutron Source. It is necessary to understand the kicker impedance before its installation into the tunnel. Conventional and improved wire methods are employed in the impedance measurement. The experimental results for the kicker impedance are explained by comparison with simulation using CST PARTICLE STUDIO. The simulation and measurement results confirm that the window-frame ferrite geometry and the end plate are the important structures causing coupling impedance. It is proved in the measurements that the mismatching from the power form network to the kicker leads to a serious oscillation sideband of the longitudinal and vertical impedance and the oscillation can be reduced by ferrite absorbing material.

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