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Chinese Physics C> 2014, Vol. 38> Issue(8) : 087004 DOI: 10.1088/1674-1137/38/8/087004

Calculations for shortening the bunch length in storage rings using a harmonic cavity

  • Using the Hefei Light Source phase Ⅱ project (HLS-Ⅱ) as an example, a theoretical analysis of shortening the bunch lengths using a higher harmonic cavity (HHC) is given. The threshold voltage of an active HHC and the threshold tuning angle of a passive HHC are first analysed. The optimum tuning angle for the constant detuning scenario and the optimum harmonic voltage for the constant voltage scenario are presented. The calculated results show that the reduced bunch length is about half that of the nominal bunch. The bunch lengths vary from 11 mm at 0.1 A to 7 mm at 0.4 A for the constant detuning scenario, while the bunch lengths are around 7 mm over the beam current range for the constant voltage scenario. In addition, the synchrotron frequency spread is increased. It indicates that HHC may be used to reduce the bunch length and increase the Landau damping of synchrotron oscillations in a storage ring.
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    [1] Migliorati M, Palumbo L, Zobov M. Nuclear Instruments and Methods in Physics Research A, 1995, 354: 215-223[2] Georgsson M et al. Nuclear Instruments and Methods in Physics Research A, 1998, 416: 465-474[3] Byrd J M et al. Nuclear Instruments and Methods in Physics Research A, 2000, 455: 271-282[4] Georgsson M et al. Nuclear Instruments and Methods in Physics Research A, 2001, 469: 373-381[5] Georgsson M et al. Using SUPER-ACO's Fifth Harmonic Cavity as a Passive Landau Cavity. Proceedings of EPAC 200, Vienna, Austria, 1960[6] MA Guang-Ming et al. Chinese Physics C (HEPNP), 2008, 32(4): 275[7] Chin Y H. Double RF System for Bunch Shortening, LBNL-29622[8] FLYNN G et al. A NEW 500 MHz Fifth Harmonic RF System for Super-Aco. Proceeding of EPAC 98, TUP03A[9] FAN Hao et al. Chinese Physics C (HEP NP), 2012, 36(9): 895[10] Byrd J M, Georgsson M. Lifetime Increase Using Passive Harmonic Cavities in Synchrotron Light Sources. Phys. Rev. ST Accel. Beams 4, 2001, 030701[11] Penco Giuseppe, Svandrlik Michele. Experimental Studies on Transient Beam Loading Effects in the Presence of a Superconducting Third Harmonic Cavity. Phys. Rev. ST Accel. Beams 9, 2006, 044401[12] Bosch R A, Hsue C S. Suppression of Longitudinal Coupled-Bunch Instabilities by a Passive Higher Harmonic Cavity. Proceeding of EPAC93. 3369-3371[13] Bosch R A, Kleman K J, Bisognano J J. Robinson Instabilities with a Higher-Harmonic Cavity. Phys. Rev. ST Accel. Beams 4, 2001, 074401

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FAN Hao, WU Cong-Feng and HE Duo-Hui. Calculations for shortening the bunch length in storage rings using a harmonic cavity[J]. Chinese Physics C, 2014, 38(8): 087004. doi: 10.1088/1674-1137/38/8/087004
FAN Hao, WU Cong-Feng and HE Duo-Hui. Calculations for shortening the bunch length in storage rings using a harmonic cavity[J]. Chinese Physics C, 2014, 38(8): 087004.  doi: 10.1088/1674-1137/38/8/087004 shu
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Received: 2013-10-24
Revised: 1900-01-01
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Calculations for shortening the bunch length in storage rings using a harmonic cavity

    Corresponding author: WU Cong-Feng,
  • Received Date: 2013-10-24
  • Accepted Date: 1900-01-01
  • Available Online: 2014-08-05

Abstract: Using the Hefei Light Source phase Ⅱ project (HLS-Ⅱ) as an example, a theoretical analysis of shortening the bunch lengths using a higher harmonic cavity (HHC) is given. The threshold voltage of an active HHC and the threshold tuning angle of a passive HHC are first analysed. The optimum tuning angle for the constant detuning scenario and the optimum harmonic voltage for the constant voltage scenario are presented. The calculated results show that the reduced bunch length is about half that of the nominal bunch. The bunch lengths vary from 11 mm at 0.1 A to 7 mm at 0.4 A for the constant detuning scenario, while the bunch lengths are around 7 mm over the beam current range for the constant voltage scenario. In addition, the synchrotron frequency spread is increased. It indicates that HHC may be used to reduce the bunch length and increase the Landau damping of synchrotron oscillations in a storage ring.

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