Broadband impedance calculations and single bunch instabilities estimations of of the HLS-II storage ring

  • The upgrade project of the Hefei Light Source storage ring is under way. In this paper, the broadband impedances of resistive wall and coated ceramic vacuum chamber are calculated using the analytic formula, and the wake fields and impedances of other designed vacuum chambers are simulated by CST code, and then a broadband impedance model is obtained. Using the theoretical formula, longitudinal and transverse single bunch instabilities are discussed. With the carefully-designed vacuum chamber, we find that the thresholds of the beam instabilities are higher than the beam current goal.
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  • [1] LI Wei-Min, XU Hong-Liang, WANG Lin, FENG Guang-Yao, ZHANG Shan-Cai, HAO Hao. The Upgraded Scheme of Hefei Light Source. AIP Conference Proceedings Vol. 1234 Issue 1, p764 June 2010
    [2] CHAO A.Physics of Collective Beam Instabilities in High Energy Accelerators.New York:Wiley Inter Science.1993
    [3] Ng K Y. Physics of Intensity Dependent Beam Instabilities, World Scientific Publishing Co. Pte. Ltd., 2006
    [4] Zotter B, Kheifets S. Impedances and Wakes in High Energy Particle Accelerators. London: W World Scientific, 1998
    [5] Bartolini R, Fielder R, Thomas C. Loss Factor and Impedance Analysis For the Diamond Storage Ring. Proceeding of IPAC'13. Shanghai, China
    [6] Stupakov G, HUANG Z. Space Charge Effect in an Accelerated Beam. SLAC-PUB-12768, August, 2007
    [7] Gluckstern R L, Zeijts J van, Zotter B. Coupling Impedance of Beam Pipes of General Cross Section. CERN SL/AP 92-25, June, 1992
    [8] Byrd J, Lambertson G. Resistive wall impedance of the B-factory. PEP-II AP Note 9-93, March 1993
    [9] Helmut Wiedemann Particle Accelerator Physics 3rd ed. New York: Springer Berlin Heidelberg, 2007
    [10] XU Hong-Liang, WANG Lin, LIU Jin-Ying, SUN Bao-Gen, HE Duo-Hui. Nuclear Techniques, 2003, 26(5): 337-342
    [11] Danilov V. An Improved Impedance Model of Metallic Coatings. EPAC 2002. 1464-1466
    [12] ZHANG S Y. SNS Storage Ring Impedance. New York: Alternating Gradient Synchrotron Department Brookhaven National Laboratory, 1999: 15-16
    [13] Blednykh A, Krinsky S, Rose J. Coupling Impedance of CESR-B RF Cavity for the NSLS-II Storage Ring PAC. 2007
    [14] Alexander Wu Chao. Maury Tigner Handbook of Accelerator Physics and Engineering, World Scientific Publishing Co. Pte. Ltd., 2013
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ZHANG Qing-Kun, WANG Lin, LI Wei-Min and GAO Wei-Wei. Broadband impedance calculations and single bunch instabilities estimations of of the HLS-II storage ring[J]. Chinese Physics C, 2015, 39(12): 127004. doi: 10.1088/1674-1137/39/12/127004
ZHANG Qing-Kun, WANG Lin, LI Wei-Min and GAO Wei-Wei. Broadband impedance calculations and single bunch instabilities estimations of of the HLS-II storage ring[J]. Chinese Physics C, 2015, 39(12): 127004.  doi: 10.1088/1674-1137/39/12/127004 shu
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Received: 2015-04-27
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    Supported by Natural Science Foundation of China (11175182, 11175180)

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Broadband impedance calculations and single bunch instabilities estimations of of the HLS-II storage ring

    Corresponding author: ZHANG Qing-Kun,
    Corresponding author: WANG Lin,
    Corresponding author: LI Wei-Min,
    Corresponding author: GAO Wei-Wei,
  • 1. NSRL, School of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230029, China
Fund Project:  Supported by Natural Science Foundation of China (11175182, 11175180)

Abstract: The upgrade project of the Hefei Light Source storage ring is under way. In this paper, the broadband impedances of resistive wall and coated ceramic vacuum chamber are calculated using the analytic formula, and the wake fields and impedances of other designed vacuum chambers are simulated by CST code, and then a broadband impedance model is obtained. Using the theoretical formula, longitudinal and transverse single bunch instabilities are discussed. With the carefully-designed vacuum chamber, we find that the thresholds of the beam instabilities are higher than the beam current goal.

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