Preliminary Study on Measurement of Magnetic Center of Quadrupoles Using Quadrupole Shunt for Hefei Storage Ring

SUN Bao-Gen; HE Duo-Hui; XU Hong-Liang; LI Jing-Yi; JIN Zheng-Fang; LU Ping; WANG Jun-Hua; WANG Lin

Chinese Physics C> 2002, Vol. 26> Issue(4) : 416-422

Preliminary Study on Measurement of Magnetic Center of Quadrupoles Using Quadrupole Shunt for Hefei Storage Ring

University of Science and Technology of China,Hefei 230029,China

Abstract
HTML
Reference
Related

PDF

Abstract：
The theoretical analysis of the DC K-modulation of quadrupole for the beam-based alignment method is presented. It is shown that the shift of the orbit,when the focussing strength of one quadrupole magnet is changed,can be described by the perturbed or unperturbed linear lattice parameters. The beam-based alignment system is constructed using DC K-modulation of quadrupole. In order to use the beam-based alignment method one must be able to individually adjust the strength of the quadrupole magnet. So,a switchable shunt resistor is installed on quadrupole to bypass 1%-2.5% magnet current and some solid-state relays are used to switch the shunt resistor in this beam-based alignment system. To improve the measurement accuracy,two methods are used. First method is that beam positions in measured quadrupole magnet are moved by local bump of beam closed orbit using the corrector magnets. Second method is that the root-mean-square of difference in closed orbit is fitted by a parabola function. The system can be not only used to position the beam in the magnetic center of quadrupoles,but also to measure the β function in quadrupole magnets. Some preliminary measurement results are given for Hefei 800MeV electron storage ring. These experimental results show that this system is valid to position the beam to the center of the quadrupole magnets and measure the β function at Hefei Light Source.

References

[1]

Rojsel P. A Beam Position Measurement System Using Quadtvploe Magnets Magnetic Centra as the Position Reference. Nucl. Instr. And Meth. In Phys. Res., 1994, A343: 374-3822 Corbett W J, Hettel R O et al. Quadruploe Shunt Experiments at SPEAR. AIP Conference Proceedings 390, Argonn, IL, May 1996, 350-3583 Jankowiak A. Stenger C et al. The DELTA Beam-Based BPM Calibration System. AIP Conference Proceedings 451, BIW 98, Stanford, CA. May 1998, 348-3554 Portmann G, Robin D et al. Automated Beam Based Alignment of the AIS Quadrupoles. Proceedings of 1995 IEEE Particle Accel-erator Conference, Dallas, Texas, May 1995, 2693-26955 Arnaudon L, Beuret A et al.A New Technique to Center the LEP Beam in·Quadnrploe. Proceedings of 1st European Workshop on Beam Diagnostics and Instrumentation for Particle Accelerators, Montreux, Switaerland, May 1993, 120-1256 MA Li, CAO Jian-She et al. HEP NP, 2000, 240 (11): 1039-1042(in Chinese)(马力, 曹建设等. 高能物理与核物理, 2000. 2400: 1039-1042)7 JIN Yu-Ming. The Physics of Electron Storage Rings. Hefei: Published by University of Science and Technology of China, 1994 (in Chinese)(金玉明. 电子储存环物理. 合肥: 中国科学按术大学出版. 1994)8 SUN Bao-Gen. Thesis for Ph. D Degree. Hefei: Published by University of Science and Technology of China, 2000 (in Chinese)(孙葆根, 博士论文. 合肥: 中国科学技术大学出版社, 2000)9 LI Jing-YI, LIU Zu-Ping et al. High Power laser and Particle Beams, 1998, 10(2): 291-295(in Chinese)(李京祎, 刘祖平等. 强激光与粒子束, 1998, 10(2): 291-295)

[1]	LI Chuan , BAO Xun , WANG Ji-Gang , XUAN Ke , JIANG Si-Yuan , CAO Shu-Li , LI Wei-Min . Temperature Monitor System of HLS Storage Ring. Chinese Physics C, 2008, 32(S1): 130-132.
[2]	ZHOU Jun , ZHU Da-Jun , LIU Sheng-Gang , WANG Han-Bin , XU Zhou , LIU Xi-San . Study on the Beam Focusing Property of 1.2MeV Electron Accelerator. Chinese Physics C, 2006, 30(11): 1116-1118.
[3]	LIU Gui-Min , Dai Zhi-Min , LI Hao-Hu , LIAO Yi , JIANG Bo-Cheng , HOU Jie , ZHAO Zhen-Tang . Lattice Design for SSRF Storage Ring. Chinese Physics C, 2006, 30(S1): 144-146.
[4]	XU Hong-Liang , WANG Lin , SUN Bao-Gen , lshang , LI Wei-Min , LIU Zu-Ping , HE Duo-Hui . The Adjustment of Phase II Upgraded Program of Hefei Electron Storage Ring. Chinese Physics C, 2006, 30(S1): 165-167.
[5]	JIAO Yi , ZHANG Lei , WANG Jiu-Qing , YUE Jun-Hui , CAO Jian-She , WANG Jun-Hua , ZHENG Kai . Application of the Turn-by-Turn Beam Position Measurements on BEPC Storage Ring. Chinese Physics C, 2006, 30(10): 1018-1021.
[6]	LONG Ji-Dong , LIN Yu-Zheng , LUO Fei , GU Zhuo-Wei , SHI Jin-Shui . Destruction Study of Tantalum Target Impacted by 12MeV Electron Beam. Chinese Physics C, 2004, 28(5): 564-568.
[7]	XU Hong-Liang , WANG Lin , AN Yi-Bin , JIANG Si-Yuan , SUN Bao-Gen , LI Wei-Min , LIU Zu-Ping , HE Duo-Hui . The Adjustment of RF System for Hefei Storage Ring. Chinese Physics C, 2003, 27(5): 449-451.
[8]	MA Li , CAO JianShe , WANG Lin . Tune Measurements in the BEPC Storage Ring. Chinese Physics C, 2000, 24(8): 770-774.
[9]	LI YongJun , JIN YuMing , LI WeiMin , SUN BaoGen , YIN LiXin , LIU ZuPing , GAO Hui . Ion Trapping and the DC Ions Clearing in HLS Ring. Chinese Physics C, 2000, 24(5): 439-444.
[10]	Wang Jiuqing , Fang Shouxian . Application of the Negahve Momentum CompactionLattice in a Tau-Charm Factory. Chinese Physics C, 1999, 23(4): 388-396.
[11]	Huang Nan , Jin Lihui , Liu Weibin , Wang Dong , Wang Jiuqing , Yu Chenghui . Study of the Lattice Design of BTCF Storage Ring. Chinese Physics C, 1998, 22(12): 1164-1173.
[12]	Rao Yinong , Xia Jiawen , Yuan Youjin , Wei Baowen . Simulation of Electron Cooling Proces in a Storage Ring. Chinese Physics C, 1997, 21(4): 368-377.
[13]	Ruan Wenying , Xie Wenfang . Description of p-⁴⁰Ca Scattering at 800 MeV Using the α-Particle Model. Chinese Physics C, 1995, 19(3): 264-269.
[14]	LI Yu-Xiong , LIANG Ren-You , LI Jue-Xin , XU Yun-Hua . The Radiation Field Measurement in the 200MeV Electron Linac Tunnel. Chinese Physics C, 1991, 15(10): 875-880.
[15]	PEI Yuan-Ji , SHEN Xiao-Feng , XU Jian-Ming . EXPERIMENT ON THE LOSS IMPEDANCE IN AN ELECTRON STORAGE PING. Chinese Physics C, 1988, 12(2): 214-220.
[16]	WU Jing-Min , LI Jian-Ping , LEI Chuan-Heng , LIU Lie-Fu . YIELD AND ANGULAR DISTRIBUTION MEASUREMENT OF NEUTRON RELEASED BY 80MeV ELECTRON INCIDENT ON TARGET. Chinese Physics C, 1987, 11(4): 433-436.
[17]	FANG Shou-Xian , CHEN Li-Min , CHEN Sen-Yu , CHEN Si-Yu , LIANG Xiu-Ru , ZHANG Chuang . IMPROVMENTS TO THE BEPC STORAGE RING LATTICE. Chinese Physics C, 1986, 10(2): 207-214.
[18]	CHEN Ke-Zhong . PION INELASTIC SCATTERING ON ¹²C AT 800MeV/c. Chinese Physics C, 1986, 10(6): 690-696.
[19]	CHEN Zhi-Cheng , LIU Jian-Yang , XU Jian-Ming . THE INVESTIGATION OF AN UNDULATOR FOR THE HEFEI 800MeV ELECTRON STORAGE RING. Chinese Physics C, 1986, 10(3): 316-322.
[20]	LIU YU-CHENG , SHI CAI-TU , CHAO WEI . EFFECTIVE LENGTH MEASUREMENT OF PULSED QUADRUPOLE LENSE. Chinese Physics C, 1982, 6(4): 499-502.

Access

Get Citation

SUN Bao-Gen, HE Duo-Hui, XU Hong-Liang, LI Jing-Yi, JIN Zheng-Fang, LU Ping, WANG Jun-Hua and WANG Lin. Preliminary Study on Measurement of Magnetic Center of Quadrupoles Using Quadrupole Shunt for Hefei Storage Ring[J]. Chinese Physics C, 2002, 26(4): 416-422.

RIS(for EndNote,Reference Manager,ProCite)

BibTex

Txt

Milestone

Received: 2001-04-06
Revised: 1900-01-01

Article Metric

Article Views(3087)
PDF Downloads(630)
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

Preliminary Study on Measurement of Magnetic Center of Quadrupoles Using Quadrupole Shunt for Hefei Storage Ring

Corresponding author: SUN Bao-Gen,

University of Science and Technology of China,Hefei 230029,China

Received Date: 2001-04-06

Accepted Date: 1900-01-01

Available Online: 2002-04-05

Abstract: The theoretical analysis of the DC K-modulation of quadrupole for the beam-based alignment method is presented. It is shown that the shift of the orbit,when the focussing strength of one quadrupole magnet is changed,can be described by the perturbed or unperturbed linear lattice parameters. The beam-based alignment system is constructed using DC K-modulation of quadrupole. In order to use the beam-based alignment method one must be able to individually adjust the strength of the quadrupole magnet. So,a switchable shunt resistor is installed on quadrupole to bypass 1%-2.5% magnet current and some solid-state relays are used to switch the shunt resistor in this beam-based alignment system. To improve the measurement accuracy,two methods are used. First method is that beam positions in measured quadrupole magnet are moved by local bump of beam closed orbit using the corrector magnets. Second method is that the root-mean-square of difference in closed orbit is fitted by a parabola function. The system can be not only used to position the beam in the magnetic center of quadrupoles,but also to measure the β function in quadrupole magnets. Some preliminary measurement results are given for Hefei 800MeV electron storage ring. These experimental results show that this system is valid to position the beam to the center of the quadrupole magnets and measure the β function at Hefei Light Source.

HTML

Reference (1)

Preliminary Study on Measurement of Magnetic Center of Quadrupoles Using Quadrupole Shunt for Hefei Storage Ring

Abstract：

References

Access

Article Metrics

Metrics

通讯作者: 陈斌, bchen63@163.com

Email This Article