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Chinese Physics C> 2016, Vol. 40> Issue(4) : 047002 DOI: 10.1088/1674-1137/40/4/047002

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

  • 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

  • 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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  • References

    [1] B. W. Zotter et al, Impedances and Wakes in High-Energy Particle Accelerators(Singapore:World Scientific, 1998), p.73
    [2] A. Chao, Physics of Collective Beam Instabilities in High Energy Accelerator(New York:Wiley Publishing Company, 1993), p. 81-174
    [3] S. Y. Lee, Accelerator Physics(Singapore:World Scientific, 2004), p. 216, 369
    [4] A. Chao and M. Tigner, Handbook of Accelerator Physics and Engineering(Singapore:World Scientific, 1998), p. 194
    [5] A. Faltens et al, An Analog Method for Measuring the Longitudinal Coupling Impedance of a Relativistic Particle Beam with Its Environment, in Proc. of the 8th International Conference on High-Energy Accelerators(1971), p. 338
    [6] M. Sands and J. Rees, A Bench Measurement of the Energy Loss of a Stored Beam to a Cavity, PEP report, PEP-95, 1974
    [7] G. Nassibian et al, Nucl. Instrum, Methods A, 159:21-27(1979)
    [8] L. S. Walling et al, Nucl. Instrum, Methods A, 281:433(1989)
    [9] F. Caspers, Bench Methods for Beam-coupling Impedance Measurement, CERN-report, CERN PS/88-59. 1988
    [10] H. Hahn and F. Pedersen, On Coaxial Wire Measurement of the Longitudinal Coupling Impedance, BNL-report, 50870, 1978
    [11] H. Hahn, PRST-AB, 3:122001(2000)
    [12] T. Toyama et al, Coupling Impedance of the J-PARC Kicker Magnets, in Proc. of HB2006(2006), p. 140
    [13] H. Gang et al, Longitudinal Broadband Impedance Measurement System by Coaxial Line Methods, in Proc. of the PAC'01(2001), p. 2060
    [14] H. Hahn et al, Measured Transverse Coupling Impedance of RHIC Injection and Abort Kickers, in Proc. of the PAC'01(2001), p. 1829
    [15] H. Hahn, PRST-AB, 7:103501(2004)
    [16] B. Podobedov et al, PRST-AB, 9:054401(2006)
    [17] Y. Shobuda et al, Horizontal Impedance of the Kicker Magnet of RCS at J-PARC, in Proc. of IPAC'10(2010), p. 2024
    [18] B. Salvant, Impedance Model of the CERN SPS and Aspects of LHC Single-Bunch Stability, Ph. D Thesis(CERN, 2010)
    [19] S. Wang et al, Scientific China Physics M A, 54:239(2011)
    [20] Y. Liu, High Power Laser and Particle Beams, 25(2):465(2013)(in Chinese)
    [21] J. Y. Tang et al, Extraction System Design for the CSNS/RCS, in Proc. of EPAC'06(2006), p. 1777
    [22] W. Kang et al, IEEE Trans. on App. Sup., 20(3):356(2010)
    [23] Y. Chi et al, Chin. Phys. C, 32(Z1):25(2008)
    [24] Y. Shobuda et al, Nucl. Instrum, Methods A, 713:52(2013)
    [25] F. Caspers, private contact, Oct. 2013
    [26] A.W. Gent, Electrical Comm., 33:234(1956)
    [27] H. Hahn, Direct Transverse Coupling Impedance Measurements of Kicker Magnets, BNL/SNS TECHNICAL NOTE, 120, 2003
    [28] A. Mostacci et al, Bench Measurements of Low Frequency Transverse Impedance, in Proc. of the PAC'03(2003), p. 1801

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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
  • Received Date: 2015-06-29
  • Accepted Date: 2015-09-21
  • Available Online: 2016-03-28
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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