Studies of Transverse Phase Space Painting for the CSNS RCS Injection

QIU Jing; TANG Jing-Yu; WANG Sheng; WEI Jie

Chinese Physics C> 2007, Vol. 31> Issue(10) : 942-946

Studies of Transverse Phase Space Painting for the CSNS RCS Injection

Institute of High Energy Physics, CAS, Beijing 100049, China2 Brookhaven National Laboratory, Upton, NY 11973, USA3 Graduate University of Chinese Academy of Sciences, CAS, Beijing 100049, China

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Abstract：
The China Spallation Neutron Source (CSNS) accelerators consist of an 80MeV proton linac, and a 1.6GeV rapid cycling synchrotron. The ring accumulates 1.88×10¹³ protons via H^－ stripping injection in the phase CSNS-Ⅰ. The injected beam is painted into a large transverse phase space to alleviate space-charge effects. The uniformity of the beam emittance after the injection is important in reducing the tune shift/spread due to the space-charge effects. The paper introduces three parameters to evaluate the uniformity of a beam distribution. To control emittance growth and reduce halo generation, different painting schemes have been compared by using the 3D simulation code ORBIT. The detailed studies on painting schemes and the dependence on the lattice tune, the injection peak current, and chopping rate are also presented.

References

[1]

. CSNS Accelerator Team. Conceptual Design on Chinese 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/2004-01)2. WANG S, QIN Q, TANG J Y 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,(增刊I)123-125)3. TANG J Y et al. HEP NP, 2006, 30(12): 1184(in Chinese) (唐靖宇等.高能物理与核物理，2006, 30(12): 1184)4. Galambos J D et al. ORBIT User Manual Version 1.10,July 1999

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QIU Jing, TANG Jing-Yu, WANG Sheng and WEI Jie. Studies of Transverse Phase Space Painting for the CSNS RCS Injection[J]. Chinese Physics C, 2007, 31(10): 942-946.

QIU Jing, TANG Jing-Yu, WANG Sheng and WEI Jie. Studies of Transverse Phase Space Painting for the CSNS RCS Injection[J]. Chinese Physics C, 2007, 31(10): 942-946. shu

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Received: 2006-11-23
Revised: 2006-12-14

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沈阳化工大学材料科学与工程学院沈阳 110142

Studies of Transverse Phase Space Painting for the CSNS RCS Injection

Corresponding author: TANG Jing-Yu,

Institute of High Energy Physics, CAS, Beijing 100049, China2 Brookhaven National Laboratory, Upton, NY 11973, USA3 Graduate University of Chinese Academy of Sciences, CAS, Beijing 100049, China

Received Date: 2006-11-23
Accepted Date: 2006-12-14
Available Online: 2007-10-05

Abstract: The China Spallation Neutron Source (CSNS) accelerators consist of an 80MeV proton linac, and a 1.6GeV rapid cycling synchrotron. The ring accumulates 1.88×10¹³ protons via H^－ stripping injection in the phase CSNS-Ⅰ. The injected beam is painted into a large transverse phase space to alleviate space-charge effects. The uniformity of the beam emittance after the injection is important in reducing the tune shift/spread due to the space-charge effects. The paper introduces three parameters to evaluate the uniformity of a beam distribution. To control emittance growth and reduce halo generation, different painting schemes have been compared by using the 3D simulation code ORBIT. The detailed studies on painting schemes and the dependence on the lattice tune, the injection peak current, and chopping rate are also presented.