Preliminary study of the higher-harmoni ccavity for HLS-Ⅱ

WU Cong-Feng; FAN Hao; WANG Lin; LIU Guang-Chao; FENG Guang-Yao; LI Wei-Min

doi:10.1088/1674-1137/36/9/017

Chinese Physics C> 2012, Vol. 36> Issue(9) : 891-894 DOI: 10.1088/1674-1137/36/9/017

Preliminary study of the higher-harmoni ccavity for HLS-Ⅱ

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Abstract：
A higher-harmonic cavity will be used to increase the beam lifetime and suppress coupled-bunch instabilities for Hefei Light Source-Ⅱ. In this paper, results simulated by the particle-tracking model confirm that tuning in the harmonic cavity may suppress the parasitic coupled-bunch instabilities. The factors calculated for lifetime improvement are larger than 2.5. The 3rd and 4th harmonic cavities have been designed. In particular, the absorbers and antenna couplers are applied in harmonic cavities to damp the higher order modes. Finally, the 4th harmonic cavity similar to the Duke's RF cavity will be used for HLS-Ⅱ.

References

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Byrd J M, Georgsson M. Phys. Rev. ST Accel. Beams, 2001, 4: 030701[2] Bosch R A. Phys. Rev. ST Accel. Beams, 2005, 8: 084401[3] Izava M. Sakanaka S et al. Proceedings of the PAC 1999. 904-906[4] Junko Watanabe, Koichi Nakayama et al. Proceedings of EPAC 2006. 2006, 1325-1327[5] Volkovilov V N et al. Problems of Atomic Science and Technology, 2004, 43: 64-66[6] Takahashi T, Izawa M, Sakanaka S, Umemori K. Proc. of 2005 Particle Accelerator Conference. 2005, 1339-1341[7] Koseki T, Izawa M et al. Development of a Damped Cavity with SiC Beam-Duct. Proceedings of the PAC 1995. 1995

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WU Cong-Feng, FAN Hao, WANG Lin, LIU Guang-Chao, FENG Guang-Yao and LI Wei-Min. Preliminary study of the higher-harmoni ccavity for HLS-Ⅱ[J]. Chinese Physics C, 2012, 36(9): 891-894. doi: 10.1088/1674-1137/36/9/017

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Received: 2011-11-11
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

Preliminary study of the higher-harmoni ccavity for HLS-Ⅱ

Corresponding author: WU Cong-Feng,

Received Date: 2011-11-11
Accepted Date: 1900-01-01
Available Online: 2012-09-05

Abstract: A higher-harmonic cavity will be used to increase the beam lifetime and suppress coupled-bunch instabilities for Hefei Light Source-Ⅱ. In this paper, results simulated by the particle-tracking model confirm that tuning in the harmonic cavity may suppress the parasitic coupled-bunch instabilities. The factors calculated for lifetime improvement are larger than 2.5. The 3rd and 4th harmonic cavities have been designed. In particular, the absorbers and antenna couplers are applied in harmonic cavities to damp the higher order modes. Finally, the 4th harmonic cavity similar to the Duke's RF cavity will be used for HLS-Ⅱ.