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Chinese Physics C> 2014, Vol. 38> Issue(3) : 037003 DOI: 10.1088/1674-1137/38/3/037003

A waveguide overloaded cavity kicker for the HLSⅡ longitudinal feedback system

  • In the upgrade project of Hefei Light Source (HLSⅡ), a new digital longitudinal bunch-by-bunch feedback system will be developed to suppress the coupled bunch instabilities in the storage ring effectively. We design a new waveguide overloaded cavity longitudinal feedback kicker as the feedback actuator. The beam pipe of the kicker is a racetrack shape so as to avoid a transition part to the octagonal vacuum chamber. The central frequency and the bandwidth of the kicker have been simulated and optimized to achieve design goals by the HFSS code. A higher shunt impedance can be obtained by using a nose cone to reduce the feedback power requirement. Before the kicker cavity was installed in the storage ring, a variety of measurements were carried out to check its performance. All these results of simulation and measurement are presented.
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    [1] Gallo A, Boni R, Ghigo et al. Particle Accelerator, 1996, 52: 95-113[2] Kim Yujong, Kwon M, HUANG J et al. IEEE Transactions on Nuclear Science, 2000, 47(2): 452-467[3] WU W Z, Kim Y, LI J Y et al. Nuclear Instruments and Methods in Physics Research A, 2011, 632: 32-42[4] Khan S, Knuth T, Gallo A et al. Proceedings of PAC 1999. New York, 1999. 1147-1149[5] Lau W K, CHANG L H, CHEN C W et al. Proceedings of PAC. Knoxville, Tennessee, 2005. 949-951[6] XU Wei, WU W Z, HE Duo-Hui et al. Chinese Physics C (HEP NP), 2013, 37(3): 037003[7] Pedersen Flemming. Lecture Notes in Physics, 1994, 425: 269-292[8] XU Wei, Design of a Longitudinal Feedback Kicker and Beam Experimental Studies Based on Transverse Feedback System in the Storage Ring (Ph. D Thesis). University of Science and Technology of China, 2013.[9] CHANG L H, Lau W K, YANG T T et al. Proceedings of EPAC 1998. Stockholm, 1998. 1708-1710[10] Heurich N, Hillert W, Roth A et al. Proceedings of IPAC 2011. San Sebastian, Spain, 2011. 484-486[11] Maier L C, Slater J C. Journal of Applied Physics, 1952, 23(1): 68-77[12] Gaspers F, Dome G. Proceedings of the Precision Electromagnetic Measurements Conference. Delft, Netherlands, 1984. 20-24

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LI Wu-Bin, ZHOU Ze-Ran, SUN Bao-Gen, WU Fang-Fang, XU Wei, LU Ping and YANG Yong-Liang. A waveguide overloaded cavity kicker for the HLSⅡ longitudinal feedback system[J]. Chinese Physics C, 2014, 38(3): 037003. doi: 10.1088/1674-1137/38/3/037003
LI Wu-Bin, ZHOU Ze-Ran, SUN Bao-Gen, WU Fang-Fang, XU Wei, LU Ping and YANG Yong-Liang. A waveguide overloaded cavity kicker for the HLSⅡ longitudinal feedback system[J]. Chinese Physics C, 2014, 38(3): 037003.  doi: 10.1088/1674-1137/38/3/037003 shu
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Received: 2013-05-21
Revised: 2013-06-27
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A waveguide overloaded cavity kicker for the HLSⅡ longitudinal feedback system

    Corresponding author: LI Wu-Bin,
    Corresponding author: SUN Bao-Gen,
  • Received Date: 2013-05-21
  • Accepted Date: 2013-06-27
  • Available Online: 2014-03-05

Abstract: In the upgrade project of Hefei Light Source (HLSⅡ), a new digital longitudinal bunch-by-bunch feedback system will be developed to suppress the coupled bunch instabilities in the storage ring effectively. We design a new waveguide overloaded cavity longitudinal feedback kicker as the feedback actuator. The beam pipe of the kicker is a racetrack shape so as to avoid a transition part to the octagonal vacuum chamber. The central frequency and the bandwidth of the kicker have been simulated and optimized to achieve design goals by the HFSS code. A higher shunt impedance can be obtained by using a nose cone to reduce the feedback power requirement. Before the kicker cavity was installed in the storage ring, a variety of measurements were carried out to check its performance. All these results of simulation and measurement are presented.

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