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Matching by solenoids in space charge dominated LEBTs
Li, JH; Tang JY(唐靖宇); 欧阳华甫; Tang, JY; Ouyang, HF
2009
发表期刊CHINESE PHYSICS C
卷号33期号:10页码:905-913
通讯作者[Li Jin-Hai] China Inst Atom Energy, Beijing 102413, Peoples R China ; [Tang Jing-Yu ; Ouyang Hua-Fu] CAS, Inst High Energy Phys, Beijing 100049, Peoples R China
摘要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.
文章类型Article
关键词betatron matching solenoid coupling terms space charge force rotationally asymmetric
学科领域Physics
研究领域[WOS]Physics
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语种英语
WOS类目Physics, Nuclear ; Physics, Particles & Fields
WOS记录号WOS:000270401800016
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文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/238714
专题加速器中心
作者单位中国科学院高能物理研究所
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Li, JH,Tang JY,欧阳华甫,et al. Matching by solenoids in space charge dominated LEBTs[J]. CHINESE PHYSICS C,2009,33(10):905-913.
APA Li, JH,唐靖宇,欧阳华甫,Tang, JY,&Ouyang, HF.(2009).Matching by solenoids in space charge dominated LEBTs.CHINESE PHYSICS C,33(10),905-913.
MLA Li, JH,et al."Matching by solenoids in space charge dominated LEBTs".CHINESE PHYSICS C 33.10(2009):905-913.
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