Design and optimization of a longitudinal feedback kicker cavity for the HLS-Ⅱ storage ring

  • In the Hefei Light Source (HLS) storage ring, multibunch operation is used to obtain a high luminosity. Multibunch instabilities can severely limit light source performance with a variety of negative impacts, including beam loss, low injection efficiency, and overall degradation of the beam quality. Instabilities of a multibunch beam can be mitigated using certain techniques including increasing natural damping (operating at a higher energy), lowering the beam current, and increasing Landau damping. However, these methods are not adequate to stabilize a multibunch electron beam at a low energy and with a high current. In order to combat beam instabilities in the HLS storage ring, active feedback systems including a longitudinal feedback system (LFB) and a transverse feedback system (TFB) will be developed as part of the HLS upgrade project, the HLS-Ⅱ storage ring project. As a key component of the longitudinal bunch-by-bunch feedback system, an LFB kicker cavity with a wide bandwidth and high shunt impedance is required. In this paper we report our work on the design of the LFB kicker cavity for the HLS-Ⅱ storage ring and present the new tuning and optimization techniques developed in designing this high performance LFB kicker.
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  • [1] WANG Lin, LI Wei-Min, FENG Guang-Yao, XU Hong-Liang, ZHANG Shan-Cai, GAO Wei-Wei, FAN Wei. The Upgrade Project of Hefei Light Source (HLS). In Proceedings of the IPAC'10. Kyto, Japan. 2588-2590[2] Serio M, Boni R, Drago A, Gallo A, Ghigo A, Marcellini F, Migliorati M, Zobov M, Claus R, Fox J, et al. Multi-Bunch Instabilities and Cures. In Proc. European Particle Accelerator Conference. 1996[3] Oxoby G, Claus R, Fox J, Hindi H, Hoejlich J, Linscott I, Olsen J, Perbhakal S, Sapozhnikov L, Corlett J, et al. Bunch-by-Bunch Longitudinal Feedback System for PEP-Ⅱ. In EPAC 94: proceedings. 1994, 1616-1618[4] Teytelman D, Rivetta C, Van Winkle D, Akre R, Fox J, Krasnykh A, Drago A, Flanagan J, Naito T, Tobiyama M. Design and Testing of Gproto Bunch-by-Bunch Signal Processor. THPCH103, EPAC. 2006, 6[5] XU W, WU W, HE D, WU Y K. Design of Longitudinal Feedback Kicker for HLS Storage Ring. In Particle Accelerator Conference. New York, NY, USA, IEEE. 2011[6] Gallo A, Boni R, Ghigo A, Marcellini F, Serio M, Zobov M. A Waveguide Overloaded Cavity as Longitudinal Kicker for the DAΦNE Bunch-by-Bunch Feedback System. Part. Accel., 1996, 52: 95-113[7] Kim Y, Kwon M, Huang J, Namkung W, Ko I. Longitudinal Feedback System Kicker for the PLS Storage Ring. Nuclear Science, IEEE Transactions on, 2000, 47(2): 452-467[8] WU W, Kim Y, LI J, Teytelman D, Busch M,d WANG P, Swift G, Park I, Ko I. Development of a Bunch-by-Bunch Longitudinal Feedback System with a Wide Dynamic Range for the HIGS Facility. Nuclear Instruments Methods in Physics Research. Section A. Accelerators, Spectrometers, Detectors, and Associated Equipment, 2011, 632(1): 32-42[9] Wiedemann H. Particle Accelerator Physics. Vol. 1. Springer Verlag, 2003[10] Pozer D. Microwave Engineering. John Wiley Sons, 2005. 298-302[11] Cohn S. Properties of Ridge Wave Guide. Proceedings of the IRE, 1947, 35(8): 783-788[12] Kelley C. Solving Nonlinear Equations with Newton's Method. Vol. 1. Society for Industrial Mathematics, 2003
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XU Wei and HE Duo-Hui. Design and optimization of a longitudinal feedback kicker cavity for the HLS-Ⅱ storage ring[J]. Chinese Physics C, 2013, 37(3): 037003. doi: 10.1088/1674-1137/37/3/037003
XU Wei and HE Duo-Hui. Design and optimization of a longitudinal feedback kicker cavity for the HLS-Ⅱ storage ring[J]. Chinese Physics C, 2013, 37(3): 037003.  doi: 10.1088/1674-1137/37/3/037003 shu
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Received: 2012-04-25
Revised: 1900-01-01
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Design and optimization of a longitudinal feedback kicker cavity for the HLS-Ⅱ storage ring

    Corresponding author: XU Wei,

Abstract: In the Hefei Light Source (HLS) storage ring, multibunch operation is used to obtain a high luminosity. Multibunch instabilities can severely limit light source performance with a variety of negative impacts, including beam loss, low injection efficiency, and overall degradation of the beam quality. Instabilities of a multibunch beam can be mitigated using certain techniques including increasing natural damping (operating at a higher energy), lowering the beam current, and increasing Landau damping. However, these methods are not adequate to stabilize a multibunch electron beam at a low energy and with a high current. In order to combat beam instabilities in the HLS storage ring, active feedback systems including a longitudinal feedback system (LFB) and a transverse feedback system (TFB) will be developed as part of the HLS upgrade project, the HLS-Ⅱ storage ring project. As a key component of the longitudinal bunch-by-bunch feedback system, an LFB kicker cavity with a wide bandwidth and high shunt impedance is required. In this paper we report our work on the design of the LFB kicker cavity for the HLS-Ⅱ storage ring and present the new tuning and optimization techniques developed in designing this high performance LFB kicker.

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