Physics Design and Study of the BSNS RCS Injection System

  • With the Beijing Spallation Neutron Source (BSNS) accelerator in design, intense H beams are first accelerated by the linac and then injected in the rapid cycling synchrotron (RCS) for accumulation and further acceleration. The injection system uses H stripping and phase space painting method to fill the large ring acceptance with the linac beam of small emittance. The method is crucial to maintain low beam loss rate during the accumulation and initial acceleration. Different from the injection design of similar high-intensity accelerators in the world, the BSNS ring injection is accomplished by magnetic elements that are completely contained in a 9 meter-long uninterrupted space of near-zero dispersion. With the accumulated 1.9×1013 particles, space charge effects play a very important role. The 3D simulations including space charge effects have been carried out to optimize the injection design. This paper presents the physics design, computer simulation results and design optimization of the injection system.
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  • [1] . CSNS Accelerator Team. Conceptual Design on Chi-nese Spallation Neutron Source-Accelerators, 2004. IHEP-CSNS-Report/2004-01E (in Chinese)(CSNS 加速器项目组. 中国散裂中子源(CSNS)概念设计–加速器方案设计与关键技术研究, 2004. IHEP-CSNS-Report/2004-01E)2. CSNS Accelerator Team (Written: TANG J Y). WorldDevelopment of Spallation Neutron Sources and CSNSProject. Proceedings of 7th National Assembly and Sympo-sium of Accelerator Society. Anhui-Taiping, 2004(in Chinese)(CSNS 加速器项目组(唐靖宇执笔). 国际散裂中子源的发展和CSNS计划. 粒子加速器学会第七次全国会员大会暨学术交流大会, 安徽太平, 2004)3. WANG Sheng, QIN Qing, TANG Jing-Yu et al. HEP NP, 2006, 30(Supp.Ⅰ): 123-125(in Chinese)(王生, 秦庆, 唐靖宇等. 高能物理与核物理, 2006, 30(增刊Ⅰ):123—125)4. Rees G H. Injection, CERN Accelerator School: CERN 94-01. 731-7435. WEI J. Reviews of Modern Physics, 2003, 75(4): 1383-14326. Galambos J D et al. ORBIT User Manual Version 1.10.July 19997. Rees G H. Status Report on ISIS. PAC 1987. WashingtonD.C., March 1987. 830-833
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TANG Jing-Yu, QIU Jing, WANG Sheng and WEI Jie. Physics Design and Study of the BSNS RCS Injection System[J]. Chinese Physics C, 2006, 30(12): 1184-1189.
TANG Jing-Yu, QIU Jing, WANG Sheng and WEI Jie. Physics Design and Study of the BSNS RCS Injection System[J]. Chinese Physics C, 2006, 30(12): 1184-1189. shu
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Received: 2006-04-23
Revised: 2006-05-30
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Physics Design and Study of the BSNS RCS Injection System

    Corresponding author: TANG Jing-Yu,
  • Institute of High Energy Physics, CAS, Beijing 100049, China2 Brookhaven National Laboratory, Upton, NY 11973, USA

Abstract: With the Beijing Spallation Neutron Source (BSNS) accelerator in design, intense H beams are first accelerated by the linac and then injected in the rapid cycling synchrotron (RCS) for accumulation and further acceleration. The injection system uses H stripping and phase space painting method to fill the large ring acceptance with the linac beam of small emittance. The method is crucial to maintain low beam loss rate during the accumulation and initial acceleration. Different from the injection design of similar high-intensity accelerators in the world, the BSNS ring injection is accomplished by magnetic elements that are completely contained in a 9 meter-long uninterrupted space of near-zero dispersion. With the accumulated 1.9×1013 particles, space charge effects play a very important role. The 3D simulations including space charge effects have been carried out to optimize the injection design. This paper presents the physics design, computer simulation results and design optimization of the injection system.

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