Study of Robinson instabilities with a higher-harmonic cavity for the HLS phase Ⅱ project

ZHAO Yu-Ning; LI Wei-Min; WU Cong-Feng; WANG Lin

doi:10.1088/1674-1137/36/11/018

Chinese Physics C> 2012, Vol. 36> Issue(11) : 1136-1139 DOI: 10.1088/1674-1137/36/11/018

Study of Robinson instabilities with a higher-harmonic cavity for the HLS phase Ⅱ project

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Abstract：
In the Phase Ⅱ Project at the Hefei Light Source, a fourth-harmonic "Landau" cavity will be operated in order to suppress the coupled-bunch instabilities and increase the beam lifetime of the Hefei storage ring. Instabilities limit the utility of the higher-harmonic cavity when the storage ring is operated with a small momentum compaction. Analytical modeling and simulations show that the instabilities result from Robinson mode coupling. In the analytic modeling, we operate an algorithm to consider the Robinson instabilities. To study the evolution of unstable behavior, simulations have been performed in which macroparticles are distributed among the buckets. Both the analytic modeling and simulations agree for passive operation of the harmonic cavity.

References

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Bosch R A, Kleman K J, Bisognano J J et al. Phys. Rev. ST Accel. Beams, 2001, 4: 074401[2] Bosch R A. Phys. Rev. ST Accel. Beams, 2005, 8: 084401[3] Bosch R A, Hsue C S. Part. Accel., 1993, 42: 81[4] Krinsky S, WANG J M. Part. Accel., 1992, 36: 205[5] WU C F, WANG L, LI W M, ZHAO Y N et al. Preliminary Study of the Higher-Harmonic Cavity for HLS-Ⅱ. Proceedings of IPAC'10, Kyoto, Japan. 2010

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ZHAO Yu-Ning, LI Wei-Min, WU Cong-Feng and WANG Lin. Study of Robinson instabilities with a higher-harmonic cavity for the HLS phase Ⅱ project[J]. Chinese Physics C, 2012, 36(11): 1136-1139. doi: 10.1088/1674-1137/36/11/018

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Received: 2012-01-16
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Study of Robinson instabilities with a higher-harmonic cavity for the HLS phase Ⅱ project

Corresponding author: WU Cong-Feng,

Received Date: 2012-01-16
Accepted Date: 1900-01-01
Available Online: 2012-11-05

Abstract: In the Phase Ⅱ Project at the Hefei Light Source, a fourth-harmonic "Landau" cavity will be operated in order to suppress the coupled-bunch instabilities and increase the beam lifetime of the Hefei storage ring. Instabilities limit the utility of the higher-harmonic cavity when the storage ring is operated with a small momentum compaction. Analytical modeling and simulations show that the instabilities result from Robinson mode coupling. In the analytic modeling, we operate an algorithm to consider the Robinson instabilities. To study the evolution of unstable behavior, simulations have been performed in which macroparticles are distributed among the buckets. Both the analytic modeling and simulations agree for passive operation of the harmonic cavity.