Calculations for shortening the bunch length in storage rings using a harmonic cavity

FAN Hao; WU Cong-Feng; HE Duo-Hui

doi:10.1088/1674-1137/38/8/087004

Chinese Physics C> 2014, Vol. 38> Issue(8) : 087004 DOI: 10.1088/1674-1137/38/8/087004

Calculations for shortening the bunch length in storage rings using a harmonic cavity

Abstract
HTML
Reference
Related

PDF

Abstract：
Using the Hefei Light Source phase Ⅱ project (HLS-Ⅱ) as an example, a theoretical analysis of shortening the bunch lengths using a higher harmonic cavity (HHC) is given. The threshold voltage of an active HHC and the threshold tuning angle of a passive HHC are first analysed. The optimum tuning angle for the constant detuning scenario and the optimum harmonic voltage for the constant voltage scenario are presented. The calculated results show that the reduced bunch length is about half that of the nominal bunch. The bunch lengths vary from 11 mm at 0.1 A to 7 mm at 0.4 A for the constant detuning scenario, while the bunch lengths are around 7 mm over the beam current range for the constant voltage scenario. In addition, the synchrotron frequency spread is increased. It indicates that HHC may be used to reduce the bunch length and increase the Landau damping of synchrotron oscillations in a storage ring.

References

[1]

Migliorati M, Palumbo L, Zobov M. Nuclear Instruments and Methods in Physics Research A, 1995, 354: 215-223[2] Georgsson M et al. Nuclear Instruments and Methods in Physics Research A, 1998, 416: 465-474[3] Byrd J M et al. Nuclear Instruments and Methods in Physics Research A, 2000, 455: 271-282[4] Georgsson M et al. Nuclear Instruments and Methods in Physics Research A, 2001, 469: 373-381[5] Georgsson M et al. Using SUPER-ACO's Fifth Harmonic Cavity as a Passive Landau Cavity. Proceedings of EPAC 200, Vienna, Austria, 1960[6] MA Guang-Ming et al. Chinese Physics C (HEPNP), 2008, 32(4): 275[7] Chin Y H. Double RF System for Bunch Shortening, LBNL-29622[8] FLYNN G et al. A NEW 500 MHz Fifth Harmonic RF System for Super-Aco. Proceeding of EPAC 98, TUP03A[9] FAN Hao et al. Chinese Physics C (HEP NP), 2012, 36(9): 895[10] Byrd J M, Georgsson M. Lifetime Increase Using Passive Harmonic Cavities in Synchrotron Light Sources. Phys. Rev. ST Accel. Beams 4, 2001, 030701[11] Penco Giuseppe, Svandrlik Michele. Experimental Studies on Transient Beam Loading Effects in the Presence of a Superconducting Third Harmonic Cavity. Phys. Rev. ST Accel. Beams 9, 2006, 044401[12] Bosch R A, Hsue C S. Suppression of Longitudinal Coupled-Bunch Instabilities by a Passive Higher Harmonic Cavity. Proceeding of EPAC93. 3369-3371[13] Bosch R A, Kleman K J, Bisognano J J. Robinson Instabilities with a Higher-Harmonic Cavity. Phys. Rev. ST Accel. Beams 4, 2001, 074401

[1]	Zhou-Yu Zhao , He-Ting Li , Qi-Ka Jia . Effect of cavity length detuning on the output characteristics for the middle infrared FEL oscillator of FELiChEM. Chinese Physics C, 2017, 41(10): 108101. doi: 10.1088/1674-1137/41/10/108101
[2]	ZHANG Qing-Kun , WANG Lin , LI Wei-Min , GAO Wei-Wei . Broadband impedance calculations and single bunch instabilities estimations of of the HLS-II storage ring. Chinese Physics C, 2015, 39(12): 127004. doi: 10.1088/1674-1137/39/12/127004
[3]	HU Liang-Jing , LI Wei-Min , WANG Lin , XIANG Dao , HUANG Xiao-Biao . A multi-length bunch design for electron storage ringswith odd buckets. Chinese Physics C, 2015, 39(7): 077001. doi: 10.1088/1674-1137/39/7/077001
[4]	TIAN Sai-Ke , JIAO Yi , WANG Jiu-Qing . Bunch length manipulation in a diffraction-limited storage ring. Chinese Physics C, 2015, 39(12): 127001. doi: 10.1088/1674-1137/39/12/127001
[5]	XU Wei , LI Jing-Yi , HE Duo-Hui . A betatron tune measurement system based on bunch-by-bunch transverse feedback at the Duke storage ring. Chinese Physics C, 2013, 37(7): 077006. doi: 10.1088/1674-1137/37/7/077006
[6]	ZHAO Yu-Ning , LI Wei-Min , WU Cong-Feng , WANG Lin . Study of Robinson instabilities with a higher-harmonic cavity for the HLS phase Ⅱ project. Chinese Physics C, 2012, 36(11): 1136-1139. doi: 10.1088/1674-1137/36/11/018
[7]	FAN Hao , WU Cong-Feng , LIU Guang-Chao . Calculations of operating schemes for a passive harmonic cavity in HLS-Ⅱ. Chinese Physics C, 2012, 36(9): 895-899. doi: 10.1088/1674-1137/36/9/018
[8]	DU Ying-Chao , HUA Jian-Fei , YAN Li-Xin , DU Qiang , HUANG Wen-Hui , TANG Chuan-Xiang . Bunch length measurement at Tsinghua Thomson scattering X-ray source. Chinese Physics C, 2011, 35(5): 505-508. doi: 10.1088/1674-1137/35/5/020
[9]	YIN Da-Yu , LIU Yong , XIA Jia-Wen , LI Peng , ZHAO Yong-Tao , YANG Lei , QI Xin . Study of a magnetic alloy-loaded RF cavity for bunch compression at the CSR. Chinese Physics C, 2010, 34(12): 1879-1882.
[10]	SUN Da-Rui , XU Jin-Qiang , CHEN Sen-Yu . Electro-optical sampling non-synchronous delay scanning measurement ofelectron beam bunch length at BFEL. Chinese Physics C, 2010, 34(2): 227-230. doi: 10.1088/1674-1137/34/2/014
[11]	ZHANG Jing-Ru , DAI Jian-Ping , GU Qiang , PEI Guo-Xi , ZHAO Ming-Hua , ZHONG Shao-Peng , WANG Xing-Tao , CHEN Yong-Zhong , HOU Mi . Bunch length measurement using a traveling wave RF deflector. Chinese Physics C, 2010, 34(1): 138-142. doi: 10.1088/1674-1137/34/1/026
[12]	GAO Jie . Analytical treatment of the nonlinear electron cloud effect and the combined effects with beam-beam and space charge nonlinear forces in storage rings. Chinese Physics C, 2009, 33(2): 135-144. doi: 10.1088/1674-1137/33/2/012
[13]	LIN Xu-Ling , ZHANG Jian-Bing , LUO Feng , BEI Hua , LU Shan-Liang , YU Tie-Min , DAI Zhi-Min . Preliminary result of bunch length measurement using a modified Michelson interferometer. Chinese Physics C, 2009, 33(10): 901-904. doi: 10.1088/1674-1137/33/10/015
[14]	QIN Qing , HUANG Nan , LIU Wei-Bin , LIU Yu-Dong , PENG Yue-Mei , QIU Jing , WANG Dou , WANG Xin-Hao , WANG Na , WANG Jiu-Qing , WEI Yuan-Yuan , WEN Xue-Mei , XING Jun , XU Gang , YU Cheng-Hui , ZHANG Chuang , ZHANG Yuan , ZHAO Zheng , ZHOU De-Min . Beam dynamics studies on BEPC-Ⅱ storage rings at the commissioning stage. Chinese Physics C, 2009, 33(S2): 65-70. doi: 10.1088/1674-1137/33/S2/017
[15]	MA Zhen-Yu , MA Guang-Ming , YU Hai-Bo , MAO Dong-Qing , FENG Zi-Qiang , HOU Hong-Tao , LIU Jian-Fei . Investigation on the fabrication of the 3rd harmonic superconducting cavity for the SSRF storage ring. Chinese Physics C, 2009, 33(9): 792-797. doi: 10.1088/1674-1137/33/9/017
[16]	SHI Jia-Ru , CHEN Huai-Bi , TANG Chuan-Xiang , HUANG Wen-Hui , DU Ying-Chao , ZHENG Shu-Xin , REN Li . RF deflecting cavity for bunch length measurement in Tsinghua Thomson scattering X-ray source. Chinese Physics C, 2009, 33(S2): 161-164. doi: 10.1088/1674-1137/33/S2/042
[17]	GAO Jie . Bunch transverse emittance increase in electron storage rings. Chinese Physics C, 2009, 33(7): 572-576. doi: 10.1088/1674-1137/33/7/013
[18]	MA Guang-Ming , ZHAO Zhen-Tang , LIU Jian-Fei . Design of a higher harmonic cavity for the SSRF storage ring. Chinese Physics C, 2008, 32(4): 275-279. doi: 10.1088/1674-1137/32/4/007
[19]	SHI Jia-Ru , CHEN Huai-Bi , TANG Chuan-Xiang , HUANG Wen-Hui , DU Ying-Chao , ZHENG Shu-Xin , REN Li . RF deflecting cavity design for bunch length measurement of photoinjector at Tsinghua University. Chinese Physics C, 2008, 32(10): 837-841. doi: 10.1088/1674-1137/32/10/014
[20]	Li Jin , Mao Zepu . Measurement of the Bunch Length of Beijing Electron Positron Collider. Chinese Physics C, 1991, 15(S3): 219-225.

Access

Get Citation

FAN Hao, WU Cong-Feng and HE Duo-Hui. Calculations for shortening the bunch length in storage rings using a harmonic cavity[J]. Chinese Physics C, 2014, 38(8): 087004. doi: 10.1088/1674-1137/38/8/087004

RIS(for EndNote,Reference Manager,ProCite)

BibTex

Txt

Milestone

Received: 2013-10-24
Revised: 1900-01-01

Article Metric

Article Views(1858)
PDF Downloads(176)
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

Calculations for shortening the bunch length in storage rings using a harmonic cavity

Corresponding author: WU Cong-Feng,

Received Date: 2013-10-24

Accepted Date: 1900-01-01

Available Online: 2014-08-05

Abstract: Using the Hefei Light Source phase Ⅱ project (HLS-Ⅱ) as an example, a theoretical analysis of shortening the bunch lengths using a higher harmonic cavity (HHC) is given. The threshold voltage of an active HHC and the threshold tuning angle of a passive HHC are first analysed. The optimum tuning angle for the constant detuning scenario and the optimum harmonic voltage for the constant voltage scenario are presented. The calculated results show that the reduced bunch length is about half that of the nominal bunch. The bunch lengths vary from 11 mm at 0.1 A to 7 mm at 0.4 A for the constant detuning scenario, while the bunch lengths are around 7 mm over the beam current range for the constant voltage scenario. In addition, the synchrotron frequency spread is increased. It indicates that HHC may be used to reduce the bunch length and increase the Landau damping of synchrotron oscillations in a storage ring.

HTML

Reference (1)

Calculations for shortening the bunch length in storage rings using a harmonic cavity

Abstract：

References

Access

Article Metrics

Metrics

通讯作者: 陈斌, bchen63@163.com

Email This Article