Bunch length measurement using a traveling wave RF deflector

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

doi:10.1088/1674-1137/34/1/026

Chinese Physics C> 2010, Vol. 34> Issue(1) : 138-142 DOI: 10.1088/1674-1137/34/1/026

Bunch length measurement using a traveling wave RF deflector

Abstract
HTML
Reference
Related

PDF

Abstract：
RF deflectors can be used for bunch length measurement with high resolution. This paper describes a completed S-band traveling wave RF deflector and the bunch length measurement of the electron beam produced by the photocathode RF gun of the Shanghai DUV-FEL facility. This is the first time that such a transverse RF deflector has been developed and used to measure the bunch length of picosecond order in China. The deflector's VSWR is 1.06, the whole attenuation 0.5 dB, and the bandwidth 4.77 MHz for VSWR less than 1.1. With a laser pulse width of 8.5 ps, beam energy of 4.2 MeV, and bunch charge of 0.64 nC, the bunch lengths for different RF input power into the deflector were measured, and an averaged rms bunch length of 5.25 ps was obtained. A YAG crystal is used as a screen downstream of the deflector, with the calibrated value of 1 pix=136 μm.

References

[1]

. Ste en B, Casalbuoni S, Schmuser P et al. Bunch Length Measurements at the SLS Linac using Electro Optical Sam-pling. Proceedings of the 2004 FEL Conference, 392-3942. Graves W S, Carr G L, Di Mauro L F et al. Ultrashort Elec-tron Bunch Length Measurements at SDUVFEL. Proceed-ings of the 2001 Particle Accelerator Conference, Chicago,2006. 22243. Settakorn C, Hernandez M et al. Femtosecond Electron Bunches. SLAC-PUB-7813, May 19984. Akre R, Bentson L et al. Bunch Length Measurementsusing a Transverse RF Deecting Structure in the SLACLINAC, SLAC-PUB-9241, May, 20025. Frohlich L et al. Longitudinal Bunch Shape Diagnostic with Coherent Radiation and a Transverse Deecting Cavity atTTF2, SLAC-PUB-113876. ZHANG Jing-Ru, HOU Mi, DAI Jian-Ping et al. Designand Studies on the Traveling Wave Transverse RF Deect-ing Structure. Chinese Physics C, 2008, 327. Bolzmann A. Investigation of the Longitudinal Charge Dis-tribution of Electron Bunches at the VUV-FEL using the Transverse Deecting Cavity LOLA. DESY-THESIS-2005-046, 2005

[1]	Jia-Jun Zheng , Yong-Liang Yang , Bao-Gen Sun , Fang-Fang Wu , Chao-Cai Cheng , Kai Tang , Jun-Hao Wei . Central RF frequency measurement of the HLS-Ⅱ storage ring. Chinese Physics C, 2016, 40(4): 047005. doi: 10.1088/1674-1137/40/4/047005
[2]	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
[3]	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
[4]	FAN Hao , WU Cong-Feng , HE Duo-Hui . Calculations for shortening the bunch length in storage rings using a harmonic cavity. Chinese Physics C, 2014, 38(8): 087004. doi: 10.1088/1674-1137/38/8/087004
[5]	YANG Yong-Liang , MA Tian-Ji , SUN Bao-Gen , WANG Ji-Gang , ZOU Jun-Ying , CHENG Chao-Cai , LU Ping . A study of pickup and signal processing for HLS-Ⅱ bunch current measurement system. Chinese Physics C, 2013, 37(9): 097006. doi: 10.1088/1674-1137/37/9/097006
[6]	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
[7]	GONG Cun-Kui , ZHENG Shu-Xin , SHAO Jia-Hang , JIA Xiao-Yu , CHEN Huai-Bi . Tuning method for nonuniform traveling-wave accelerating structures. Chinese Physics C, 2013, 37(1): 017003. doi: 10.1088/1674-1137/37/1/017003
[8]	LI Wei-Wei , HE Zhi-Gang , JIA Qi-Ka . Generation and measurement of sub-picosecond electron bunch in photocathode rf gun. Chinese Physics C, 2013, 37(12): 127002. doi: 10.1088/1674-1137/37/12/127002
[9]	PEI Shi-Lun , CHI Yun-Long , ZHANG Jing-Ru , HOU Mi , LI Xiao-Ping . RF-thermal-structural-RF coupled analysis on a travelling wave disk-loaded accelerating structure. Chinese Physics C, 2012, 36(6): 555-560 . doi: 10.1088/1674-1137/36/6/013
[10]	SUN Shuai-Shuai , XU Guang-Lei , LEI Ge , HUANG Yan , GAO Zhen-Hua , ZHANG Zhi-Yin , TAO Ye . Fluorescence lifetime measurement from a designated single-bunch in the BEPCⅡ colliding mode. Chinese Physics C, 2011, 35(10): 969-973. doi: 10.1088/1674-1137/35/10/016
[11]	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
[12]	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.
[13]	ZHOU Zu-Sheng , CHI Yun-Long , GU Meng-Ping , PEI Guo-Xi . 200 MW S-band traveling wave resonant ring development at IHEP. Chinese Physics C, 2010, 34(3): 402-404. doi: 10.1088/1674-1137/34/3/019
[14]	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
[15]	XU Zhe , ZHAO Hong-Wei , WANG Chun-Xiao , XIA Jia-Wen , ZHAN Wen-Long , BIAN Zhi-Bin . RF system design and measurement of HIRF-CSRe. Chinese Physics C, 2009, 33(5): 387-392. doi: 10.1088/1674-1137/33/5/014
[16]	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
[17]	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
[18]	ZHANG Jing-Ru , HOU Mi , DAI Jian-Ping , PEI Shi-Lun , PEI Guo-Xi . Design and studies on the traveling wave transverse RF deflecting structure. Chinese Physics C, 2008, 32(3): 232-235. doi: 10.1088/1674-1137/32/3/015
[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

ZHANG Jing-Ru, DAI Jian-Ping, GU Qiang, PEI Guo-Xi, ZHAO Ming-Hua, ZHONG Shao-Peng, WANG Xing-Tao, CHEN Yong-Zhong and HOU Mi. Bunch length measurement using a traveling wave RF deflector[J]. Chinese Physics C, 2010, 34(1): 138-142. doi: 10.1088/1674-1137/34/1/026

RIS(for EndNote,Reference Manager,ProCite)

BibTex

Txt

Milestone

Received: 2009-03-06
Revised: 2009-03-17

Article Metric

Article Views(2779)
PDF Downloads(633)
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

Bunch length measurement using a traveling wave RF deflector

Corresponding author: ZHANG Jing-Ru,

Received Date: 2009-03-06

Accepted Date: 2009-03-17

Available Online: 2010-01-05

Abstract:

RF deflectors can be used for bunch length measurement with high resolution. This paper describes a completed S-band traveling wave RF deflector and the bunch length measurement of the electron beam produced by the photocathode RF gun of the Shanghai DUV-FEL facility. This is the first time that such a transverse RF deflector has been developed and used to measure the bunch length of picosecond order in China. The deflector's VSWR is 1.06, the whole attenuation 0.5 dB, and the bandwidth 4.77 MHz for VSWR less than 1.1. With a laser pulse width of 8.5 ps, beam energy of 4.2 MeV, and bunch charge of 0.64 nC, the bunch lengths for different RF input power into the deflector were measured, and an averaged rms bunch length of 5.25 ps was obtained. A YAG crystal is used as a screen downstream of the deflector, with the calibrated value of 1 pix=136 μm.

HTML

Reference (1)

Bunch length measurement using a traveling wave RF deflector

Abstract：

References

Access

Article Metrics

Metrics

通讯作者: 陈斌, bchen63@163.com

Email This Article