Transient Beam Loading Effects on Standing Wave Cavities in Linear Accelerators

PEI Shi-Lun; WANG Shu-Hong

Chinese Physics C> 2006, Vol. 30> Issue(5) : 454-461

Transient Beam Loading Effects on Standing Wave Cavities in Linear Accelerators

PEI Shi-Lun ^, ,
WANG Shu-Hong

Institute of High Energy Physics, CAS, Beijing 100049, China2 Graduate School of the Chinese Academy of Sciences, Beijing 100049, China

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Abstract：
In modern high energy accelerators, with the increase of charge in a bunch or a bunch train, the induced transient beam loading voltages become higher and higher when the beams pass through the standing wave cavities. But in the usual analysis, people usually pay more attention to the steady state instead of the transient state beam loading. In this paper, the transient nature of beam loading and the cavity's frequency changing behavior seen by the RF power generator are studied, and then the optimum detuning conditions in two cases are derived. In the first case, the resonant cavity's frequency can be tuned to meet the in-phase condition between the RF power enerator current and the cavity voltage during the passage of beams. While in the second case, only few bunches in the bunch train and the cavity's resonant frequency is fixed during the passage of the bunch train. At last, the beam loading effects in the prebuncher of BEPCⅡ pre-injector and the two SHBs of BEPCⅡ futurepre-injector are studied.

References

[1]

. LU Xiang-Yang et al. Atomic Energy Science and Technology, 2003, 37(5): 385-388 (in Chinese)(鲁向阳等.原子能科学技术,2003, 37(5): 385-388)2. Hasan P, Jens K, Tom H. RF Superconductivity for Accelerators. New York: John WileySons, Inc., 1998. 331-4013. K Y Ng. Physics of Intensity Dependent Beam Instabilities,Fermilab-FN-0713. FNAL, January 20024. Thomas P. Wangler. Principles of RF Linear Accelerators.New York: John Wiley Sons, Inc., April 19985. Roux R, Bienvenu G. High Current Operation of Pre-bunching Cavities in the CTF3 Accelerator. Lucerne,Switzerland. Proc. of EPAC 2004, 6746. DAI Jian-Ping. Research of Beam-Cavity Interaction inHLS Ring. PhD Thesis, USTC1997(in Chinese) (戴建秤.合肥同步辐射储存环束流与高频腔相级作用理论和实验的研究.博士论文,中国科学技术大学,1997)7. ZHAO Fu-Guang et al. Atomic Energy Science and Tech-nology, 1986, 20(6): 675-680(in Chinese)(赵富广等.原子能科学技术,1986, 20(6): 675-680)8. PEI Guo-Xi et al. Overview of BEPC/ Linac Upgrade.Preliminary Design Report of BEPC/-Linac: IHEP-BEPCII-SB-03. 2002.69. PEI Shi-Lun et al. HEPNP, 2004, 28(5): 549 (in Chinese)(裴士伦等.高能物理与核物理,2004, 28(5): 549)10. PEI Shi-Lun et al. High Power Laser and Particle Beams,2004, 16(6): 795(in Chinese)(裴士伦等.强激光与粒r束,2004, 16(6): 795)11. PEI Shi-Lun et al. Atomic Energy Science and Technology,2005, 39: 385-389(in Chinese)(裴士伦等.原子能科学技术,2005, 39: 385-389)

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PEI Shi-Lun and WANG Shu-Hong. Transient Beam Loading Effects on Standing Wave Cavities in Linear Accelerators[J]. Chinese Physics C, 2006, 30(5): 454-461.

PEI Shi-Lun and WANG Shu-Hong. Transient Beam Loading Effects on Standing Wave Cavities in Linear Accelerators[J]. Chinese Physics C, 2006, 30(5): 454-461. shu

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Received: 2005-06-29
Revised: 2005-09-11

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Transient Beam Loading Effects on Standing Wave Cavities in Linear Accelerators

PEI Shi-Lun ^,
WANG Shu-Hong

Corresponding author: PEI Shi-Lun,

Institute of High Energy Physics, CAS, Beijing 100049, China2 Graduate School of the Chinese Academy of Sciences, Beijing 100049, China

Received Date: 2005-06-29
Accepted Date: 2005-09-11
Available Online: 2006-05-05

Abstract: In modern high energy accelerators, with the increase of charge in a bunch or a bunch train, the induced transient beam loading voltages become higher and higher when the beams pass through the standing wave cavities. But in the usual analysis, people usually pay more attention to the steady state instead of the transient state beam loading. In this paper, the transient nature of beam loading and the cavity's frequency changing behavior seen by the RF power generator are studied, and then the optimum detuning conditions in two cases are derived. In the first case, the resonant cavity's frequency can be tuned to meet the in-phase condition between the RF power enerator current and the cavity voltage during the passage of beams. While in the second case, only few bunches in the bunch train and the cavity's resonant frequency is fixed during the passage of the bunch train. At last, the beam loading effects in the prebuncher of BEPCⅡ pre-injector and the two SHBs of BEPCⅡ futurepre-injector are studied.