Matching by solenoids in space charge dominated LEBTs

LI Jin-Hai; TANG Jing-Yu; OUYANG Hua-Fu

doi:10.1088/1674-1137/33/10/016

Chinese Physics C> 2009, Vol. 33> Issue(10) : 905-913 DOI: 10.1088/1674-1137/33/10/016

Matching by solenoids in space charge dominated LEBTs

Abstract
HTML
Reference
Related

PDF

Abstract：
The betatron matching of a rotationally asymmetric beam in space charge
dominated low-energy beam transports (LEBTs) where solenoids are used for
the transverse matching has been studied. For better understanding, the
coupling elements of a beam matrix are interpreted in special forms that are
products of a term defined by the Larmor rotation angle and another by the
difference between the beam matrix elements in the two transverse planes.
The coupling form originally derived from the rotationally symmetric field
in solenoids still holds when taking into account the rotationally asymmetric space charge forces that are due to the unequal emittance in the two transverse planes. It is shown in this paper that when an LEBT mainly
comprising solenoids transports a beam having unequal emittance in the two
transverse planes and the linear space charge force is taken into account,
the initial Twiss parameters can be modified to obtain the minimum and equal
emittance at the LEBT exit. The TRACE3D calculations also prove the principle. However, when quadrupoles that are also rotationally asymmetric are involved in between solenoids, the coupling between the two transverse planes becomes more complicated and the emittance increase is usually unavoidable. A matching example using the CSNS (China Spallation Neutron Source) LEBT conditions is also presented.

References

[1]

. Thomason J W G, Faircloth D C, Sidlow R et al. EPAC,2004, 14582. Planner C W. Particle Accelerators, 1995, 48: 2433. CHEN C, Davidson R C. Phys. Rev. E, 1994, 49: 26574. Davidson R C, QIN H. Physics of Intense Charged ParticleBeams in High Energy Accelerators. London: WordScienti c Publishing Co. Pte. Ltd., 2001. 242-2525. Lund S M, Bukh B. Phys. Rev. ST Accel. Beams, 2004, 7:0248016. LI Jin-Hai, TANG Jing-Yu. Nuclear Instruments and Methodsin Physics Research Section A, 2007, 574: 221-2257. LU Jian-Qin, LI Jin-Hai, LI Chao-Long. Chinese Physics,2004, 13(5): 6578. Crandall K R, Rusthoi D P. TRACE3-D Documentation,LA-UR-97-886. May, 19979. Lapostolle P M. CERN Report AR/Int. SG/65-15. Geneva,Switzerland, July 196510. Ferdinand R, Sherman J, Stevens R R et al. Proc. of PAC,1997, 2723-272511. Ueno A, Ikegami K, Okada M et al. Proc. of LINAC. 2002,35612. LI Jin-Hai, OUYANG Hua-Fu, FU Shi-Nian et al. ChinesePhysics C (HEP NP), 2008, 32(3): 227-231

[1]	Ran Xiao , Yan-Fen Liu , Wen-Zhen Xu , Xiao-Jie Ni , Zi-Wen Pan , Bang-Jiao Ye . A new muon-pion collection and transport system design using superconducting solenoids based on CSNS. Chinese Physics C, 2016, 40(5): 057004. doi: 10.1088/1674-1137/40/5/057004
[2]	HUANG Fei , ZHANG Zong-Ye , SHEN Peng-Nian , WANG Wen-Ling . Is d^* a candidate for a hexaquark-dominated exotic state?. Chinese Physics C, 2015, 39(7): 071001. doi: 10.1088/1674-1137/39/7/071001
[3]	TANG Mei-Tang , YANG Xiao-Dong , MAO Li-Jun , LI Jie , MA Xiao-Ming , YAN Tai-Lai , ZHENG Wen-Heng , ZHAO He , WU Bo , WANG Geng , RUAN Shuang , SHA Xiao-Ping . Side-effects of the space charge field introduced by a hollow electron beam in the electron cooler of CSRm. Chinese Physics C, 2015, 39(12): 127003. doi: 10.1088/1674-1137/39/12/127003
[4]	ZHANG Fei , FAN Rui-Rui , PENG Wen-Xi , DONG Yi-Fan , GONG Ke , LIANG Xiao-Hua , LIU Ya-Qing , WANG Huan-Yu . A prototype silicon detector system for space cosmic-ray charge measurement. Chinese Physics C, 2014, 38(6): 066101. doi: 10.1088/1674-1137/38/6/066101
[5]	LI Chao , ZHANG Zhi-Lei , QI Xin , XU Xian-Bo , HE Yuan , YANG Lei . Beam dynamics study of RFQ for CADS with a 3D space-charge-effect. Chinese Physics C, 2014, 38(3): 037005. doi: 10.1088/1674-1137/38/3/037005
[6]	XU Gang , JIAO Yi , TIAN Sai-Ke . Realization of a locally-round beam in an ultimate storage ring using solenoids. Chinese Physics C, 2013, 37(6): 067002. doi: 10.1088/1674-1137/37/6/067002
[7]	ZHAO Ya-Liang , FU Shi-Nian , LI Zhi-Hui , XU Cheng-Hai , YANG Xiao-Yu . 3D space charge code with the FFT method. Chinese Physics C, 2013, 37(3): 037004. doi: 10.1088/1674-1137/37/3/037004
[8]	LÜ Jian-Qin . Transport of 3D space charge dominated beams. Chinese Physics C, 2013, 37(10): 107001. doi: 10.1088/1674-1137/37/10/107001
[9]	WANG Wen-Jing , HUANG Sen-Lin , QUAN Sheng-Wen , LIN Lin , LIU Ke-Xin . An emittance measurement device for a space-charge dominated electron beam. Chinese Physics C, 2012, 36(9): 867-870. doi: 10.1088/1674-1137/36/9/013
[10]	XU Shou-Yan , WANG Sheng . Study on space charge effects of the CSNS/RCS. Chinese Physics C, 2011, 35(12): 1152-1158. doi: 10.1088/1674-1137/35/12/014
[11]	DONG Yu-Bing . Pion charge form factor and constraints from space-time translations. Chinese Physics C, 2010, 34(9): 1342-1345. doi: 10.1088/1674-1137/34/9/038
[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]	YIN Xue-Jun , FU Shi-Nian , PENG Jun . Emittance coupling driven by space charge in the CSNS linac. Chinese Physics C, 2009, 33(9): 811-814. doi: 10.1088/1674-1137/33/9/020
[14]	ZHOU Wan-Ping , CAI Shao-Hong , LONG Zheng-Wen . Quantum electrodynamics with arbitrary charge on a noncommutative space. Chinese Physics C, 2009, 33(1): 10-14. doi: 10.1088/1674-1137/33/1/003
[15]	WAN Ren-Zhuo , XU Chun-Cheng , ZHOU Dai-Cui , YIN Zhong-Bao . Track matching study from TPC to PHOS in ALICE. Chinese Physics C, 2008, 32(8): 620-623. doi: 10.1088/1674-1137/32/8/006
[16]	G.D.Alton , H.Bilheux . Elementary Theory for Optimum Extraction of Space-Charge-Dominated Ion Beams from Plasma Boundaries. Chinese Physics C, 2007, 31(S1): 201-205.
[17]	DENG Jian-Jun , WANG Jian-Guang , Reiser Martin , Godlove Terry . Longitudinal Focusing Design of Space-Charge Dominated Beams. Chinese Physics C, 2003, 27(12): 1119-1122.
[18]	CHEN YinBao , HUANG ZhiBin . Resonance, Chaos and Halo Formation in Space Charge Dominated Beams. Chinese Physics C, 2000, 24(6): 560-566.
[19]	Song Zhongheng , Wang Xiaomin . Calculation of Space Charge Field for Annulus and Disc Bunch of Charged Particles. Chinese Physics C, 1991, 15(S2): 119-125.
[20]	Yu Qingchang . Electron Clouds in Axial Symmetrical Space-Charge Lenses. Chinese Physics C, 1989, 13(S2): 143-148.

Access

Get Citation

LI Jin-Hai, TANG Jing-Yu and OUYANG Hua-Fu. Matching by solenoids in space charge dominated LEBTs[J]. Chinese Physics C, 2009, 33(10): 905-913. doi: 10.1088/1674-1137/33/10/016

LI Jin-Hai, TANG Jing-Yu and OUYANG Hua-Fu. Matching by solenoids in space charge dominated LEBTs[J]. Chinese Physics C, 2009, 33(10): 905-913. doi: 10.1088/1674-1137/33/10/016 shu

RIS(for EndNote,Reference Manager,ProCite)

BibTex

Txt

Milestone

Received: 2009-01-19
Revised: 2009-03-23

Article Metric

Article Views(2388)
PDF Downloads(655)
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

Matching by solenoids in space charge dominated LEBTs

Corresponding author: LI Jin-Hai,

Received Date: 2009-01-19

Accepted Date: 2009-03-23

Available Online: 2009-10-05

Abstract:

The betatron matching of a rotationally asymmetric beam in space charge
dominated low-energy beam transports (LEBTs) where solenoids are used for
the transverse matching has been studied. For better understanding, the
coupling elements of a beam matrix are interpreted in special forms that are
products of a term defined by the Larmor rotation angle and another by the
difference between the beam matrix elements in the two transverse planes.
The coupling form originally derived from the rotationally symmetric field
in solenoids still holds when taking into account the rotationally asymmetric space charge forces that are due to the unequal emittance in the two transverse planes. It is shown in this paper that when an LEBT mainly
comprising solenoids transports a beam having unequal emittance in the two
transverse planes and the linear space charge force is taken into account,
the initial Twiss parameters can be modified to obtain the minimum and equal
emittance at the LEBT exit. The TRACE3D calculations also prove the principle. However, when quadrupoles that are also rotationally asymmetric are involved in between solenoids, the coupling between the two transverse planes becomes more complicated and the emittance increase is usually unavoidable. A matching example using the CSNS (China Spallation Neutron Source) LEBT conditions is also presented.

HTML

Reference (1)

Matching by solenoids in space charge dominated LEBTs

Abstract：

References

Access

Article Metrics

Metrics

通讯作者: 陈斌, bchen63@163.com

Email This Article