Impedances and beam instability in RCS/CSNS

Liu Yudong; Huang Liangsheng; Wang Sheng; Wang Na; Li Yong

doi:10.3788/HPLPB20132502.0465

Volume 25 Issue 02

Dec. 2012

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Article Navigation > High Power Laser and Particle Beams > 2013 > 25(02): 465-470

Wang Huaying, Zhang Zhihui, Zhao Baoqun, et al. Unwrapping algorithm of under-sampled wrapped-phase map[J]. High Power Laser and Particle Beams, 2012, 24: 2311-2317. doi: 10.3788/HPLPB20122410.2311

Citation:

Liu Yudong, Huang Liangsheng, Wang Sheng, et al. Impedances and beam instability in RCS/CSNS[J]. High Power Laser and Particle Beams, 2013, 25: 465-470. doi: 10.3788/HPLPB20132502.0465

Wang Huaying, Zhang Zhihui, Zhao Baoqun, et al. Unwrapping algorithm of under-sampled wrapped-phase map[J]. High Power Laser and Particle Beams, 2012, 24: 2311-2317. doi: 10.3788/HPLPB20122410.2311

Citation:

Liu Yudong, Huang Liangsheng, Wang Sheng, et al. Impedances and beam instability in RCS/CSNS[J]. High Power Laser and Particle Beams, 2013, 25: 465-470. doi: 10.3788/HPLPB20132502.0465

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Impedances and beam instability in RCS/CSNS

doi: 10.3788/HPLPB20132502.0465

1.
Institute of High Energy Physics,Chinese Academy of Sciences,P.O.Box 918,Beijing 100049,China

Received Date: 2012-04-10
Rev Recd Date: 2012-10-17
Publish Date: 2013-02-10

Abstract

Abstract

The rapid cycling synchrotron of the China Spallation Neutron Source is a high intensity proton accelerator, with an average beam power of 100 kW. The collective effects caused by the coupling impedances from the vacuum components may be the limit to beam power. The impedances from various kinds of components were investigated and the impedance budgets were summarized. According to the summarized impedances, the thresholds for instability were estimated. Because of the serious instability from the resistive wall impedance, a simple resistive-wall wake-field model was used to track the bunch oscillation, and the growth rate was derived from simulation which was consistent with analysis. When the natural chromaticity which helps to stabilize the beam is considered in the simulation, the instability of resistive wall will disappear.
- China Spallation Neutron Source,
- rapid cycling synchrotron,
- impedance,
- instability,
- resistive wall

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