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

Abstract
HTML
Reference
Related

PDF

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)

[1]	SUN Bao-Gen , LUO Qing , WANG Xiao-Hui . Recent Developments of Beam Diagnostics. Chinese Physics C, 2008, 32(S1): 145-147.
[2]	HUANG Guo-Qing , YE Kai-Rong . Beam Measurement Using Digital Technology. Chinese Physics C, 2008, 32(S1): 142-144.
[3]	WANG Shu-Hong , PEI Guo-Xi , CHI Yun-Long , CHEN Yan-Wei , CAO Jian-She , KONG Xiang-Cheng , ZHAO Feng-Li , HOM Mi , CHEN Zhi-Bi , LIU Wei-Bin , DENG Bing-Lin , GENG Zhe-Qiao , PEI Shi-Lun , SHEN Li , LE Qi , YE Qiang . BEPCⅡ Linac Beam Commissioning and Operation. Chinese Physics C, 2008, 32(S1): 215-217.
[4]	WANG Shu-Hong , PEI Guo-Xi , LIU Wei-Bin , CHEN Yan-Wei , YE Qiang , GENG Zhe-Qiao . Studies on the Beam Orbit and Energy Instabilities at the BEPCⅡ Linac. Chinese Physics C, 2007, 31(11): 1067-1070.
[5]	WEN Yong-Wu , WEN Xu , LIU Jian-Xin . Microwave System of Medical Standing Electron Linear Accelerator. Chinese Physics C, 2007, 31(7): 683-685.
[6]	CHEN Yan-Wei , WANG Shu-Hong , PEI Guo-Xi , LIU Wei-Bin , YE Qiang . Beam Commissioning of BEPCII Injector Linac. Chinese Physics C, 2006, 30(6): 562-565.
[7]	XING Qing-Zi , FU Shi-Nian , LIN Yu-Zheng , FANG Shou-Xian . Calculation of Beam Acceptance for RFQ Accelerators. Chinese Physics C, 2003, 27(7): 628-632.
[8]	OUYANG Hua-Fu . Effects of the Space Charge Forces and the Beam Halo in a Cyclotron. Chinese Physics C, 2001, 25(7): 674-679.
[9]	OUYANG Hua-Fu . Effects of the Space Charge Forces and the Beam Halo in an AVF Cyclotron with Intense Beam Currents. Chinese Physics C, 2001, 25(6): 561-570.
[10]	Chen Yinbao , Huang Zhibin . Nonlinear Space Charge Effects and Emittance Growth in Linac. Chinese Physics C, 1999, 23(12): 1231-1242.
[11]	Zhang Chuang . Beam Energy Correction in Synchrotrons. Chinese Physics C, 1999, 23(3): 308-312.
[12]	Wang Lanfa , Lin Yuzheng , Tong Dechun . Beam Loading Effects for A Tow-Beam Ring. Chinese Physics C, 1999, 23(8): 828-834.
[13]	Tang Jingyu , Lei Wen , Wang Yifang . Beam Loss in HIRFL-CSR Due to CollisionsWith Residual Gas in Vacuum. Chinese Physics C, 1998, 22(8): 745-754.
[14]	Chen Yinbao , Huang Zhibin , FuShinian . Scaling Law of Emittance Growth for Bunched Beam with Gaussian Density Distribution in Both Longitudinal and Transverse Directions in Linac. Chinese Physics C, 1997, 21(7): 657-663.
[15]	Huang Yongzhang , Wu Gang . Transient Beam Loading Problem in Constant Gradient Accelerator Structure. Chinese Physics C, 1994, 18(4): 310-316.
[16]	YUAN Qin-Liang , WANG You-Zhi , SHI Cai-Tu , CHEN Guan-Xiong , ZHANG Shu-Xiang , CHEN Ren-Huai , LIU Mao-San . APPLICATION OF PERMANENT MAGNET LENSES IN ACCELERATORS BEAM TRANSPORT AND FOCUSING. Chinese Physics C, 1987, 11(1): 11-15.
[17]	WEI Kai-Yu , LIN Zhen-Hua , LÜ Ji-Hua , WANG Shu-Hong , LUO Zi-Hua , SUN Song-Lan , ZHU Ren-Quan . DESIGN AND BEAM TEST FOR THE BPL 35.5MeV BEAM TRANSPORT SYSTEM. Chinese Physics C, 1987, 11(4): 571-576.
[18]	LUO Zi-Hua , WANG Shu-Hong . BEAM MATCHING CALCULATIONS IN TRANSVERSE MOTION FOR THE 10MeV BEIJING PROTON LINAC. Chinese Physics C, 1985, 9(2): 191-199.
[19]	XU Jian-Ming , LIU Shi-Yao . A PROPOSAL FOR THE MEASUREMENT OF THE REAL EMITTANCE OF THE BEAM IN CYCLIC ACCELERATORS. Chinese Physics C, 1983, 7(2): 178-185.
[20]	LUO ZI-HUA , LUO YING-XIONG , WANG LIN-LIN . STUDY OF THE BEAM TRAMSVERSE MOTION IN THE RFQ STRUCTURE. Chinese Physics C, 1982, 6(6): 688-696.

Access

Get Citation

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

RIS(for EndNote,Reference Manager,ProCite)

BibTex

Txt

Milestone

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

Article Metric

Article Views(5196)
PDF Downloads(886)
Cited by(0)

Policy on re-use

To reuse of subscription content published by CPC, the users need to request permission from CPC, unless the content was published under an Open Access license which automatically permits that type of reuse.

通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Transient Beam Loading Effects on Standing Wave Cavities in Linear Accelerators

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.

HTML

Reference (1)

Transient Beam Loading Effects on Standing Wave Cavities in Linear Accelerators

Abstract：

References

Access

Article Metrics

Metrics

通讯作者: 陈斌, bchen63@163.com

Email This Article