LOM and HOM damping study in a superconducting deflecting cavity for ALS at LBNL

SHI Jia-Ru; CHEN Huai-Bi; TANG Chuan-Xiang; ZHENG Shu-Xin; Derun Li

doi:10.1088/1674-1137/32/3/009

Chinese Physics C> 2008, Vol. 32> Issue(3) : 205-208 DOI: 10.1088/1674-1137/32/3/009

LOM and HOM damping study in a superconducting deflecting cavity for ALS at LBNL

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Abstract：
Superconducting deflecting cavities can be used in synchrotron light source to generate subpico-second X-ray pulses while the impedance of the lower order modes (LOM) and higher order modes (HOM) in the cavity should be kept below an accepted level to avoid beam instability. These modes can be damped by adding waveguide on beam pipe. Detailed simulation of Q in CST Microwave
Studio is introduced and experiment results on an aluminum model cavity with damping waveguide are reported to make a comparison.

References

[1]

. Zholents A et al. NIM A, 1999, 425: 385-3892. Robin D et al. Generation of Picosecond X-Ray Pulses in the ALS Using RF Orbit Deection. In: Proceedings of PAC 2005, Knoxville, TN. 2005. 3659-36613. Shi J et al. A Three-Cell Superconducting Deflecting Cavity Design for the ALS at LBNL. In: Proceedings of PAC 2005, Knoxville, TN. 2005. 4287-42894. Hosoyama K et al. Superconducting Crab Cavity for KEKB. In: Proceedings of APAC98, Tsukuba, Japan.1998. 828-8305. CHAO A W. Physics of Collective Beam Instabilities in High Energy Accelerators. New York: John Wiley Sons,1993. 67-966. Akai K, Funakoshi Y. Beam-Loading Issues and Requirements for the KEKB Crab RF System. In: Proceedings of EPAC96, Barcelona. 1996. 2118-21207. Kwiatkowski S, Baptiste K, Julian J. New Waveguide-Type Hom Damper for ALS Storage Ring Cavities. In: Proceedings of EPAC2004, Lucerne, Switzerland. 2004. 1069-10718. LI D et al. RF Deflcecting Cavity Design for Berkeley Ul-trafast X-Ray Source. In: Proceedings of EPAC2002, Paris,France. 2002. 2553-25559. Browman M J. Using the Panofsky-Wenzel Theorem in the Analysis of Radio-Frequency Deflectors. In: Proceedings of PAC 1993, Washington, D.C. 1993. 800-80210. Shi J et al. Comparison of Measured and Calculated Coupling between a Waveguide and an RF Cavity Using CST Microwave Studio. In: Proceedings of EPAC06, Edinburgh,Scotland. 2006. 1328-1330

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SHI Jia-Ru, CHEN Huai-Bi, TANG Chuan-Xiang, ZHENG Shu-Xin and Derun Li. LOM and HOM damping study in a superconducting deflecting cavity for ALS at LBNL[J]. Chinese Physics C, 2008, 32(3): 205-208. doi: 10.1088/1674-1137/32/3/009

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Received: 2007-05-18
Revised: 2007-06-23

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沈阳化工大学材料科学与工程学院沈阳 110142

LOM and HOM damping study in a superconducting deflecting cavity for ALS at LBNL

Corresponding author: SHI Jia-Ru,

Received Date: 2007-05-18
Accepted Date: 2007-06-23
Available Online: 2008-03-05

Abstract:

Superconducting deflecting cavities can be used in synchrotron light source to generate subpico-second X-ray pulses while the impedance of the lower order modes (LOM) and higher order modes (HOM) in the cavity should be kept below an accepted level to avoid beam instability. These modes can be damped by adding waveguide on beam pipe. Detailed simulation of Q in CST Microwave
Studio is introduced and experiment results on an aluminum model cavity with damping waveguide are reported to make a comparison.