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

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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,

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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