Design of the low energy beam transport line for the China spallation neutron source

LI Jin-Hai; OUYANG Hua-Fu; FU Shi-Nian; ZHANG Hua-Shun; HE Wei

doi:10.1088/1674-1137/32/3/014

Chinese Physics C> 2008, Vol. 32> Issue(3) : 227-231 DOI: 10.1088/1674-1137/32/3/014

Design of the low energy beam transport line for the China spallation neutron source

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Abstract：
The design of the China Spallation Neutron Source (CSNS) low-energy beam transport (LEBT) line, which locates between the ion source and the radio-frequency quadrupole (RFQ), has been completed with the TRACE3D code. The design aims at perfect matching, primary chopping, a small emittance growth and sufficient space for beam diagnostics. The line consists of three solenoids, three vacuum chambers, two steering magnets and a pre-chopper. The total length of LEBT is about 1.74m. This LEBT is designed to transfer 20mA of H-pulsed beam from the ion source to the RFQ. An induction cavity is adopted as the pre-chopper. The electrostatic octupole steerer is discussed as a candidate. A four-quadrant aperture for beam scraping and beam position monitoring is designed.

References

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. Thomason J W G, Sidlow R. EPAC 2000. 1625-16272. Faircloth D C, Sidlow R , Whitehead M O et al. PAC 2005.1910-19123. Thomason J W G, Faircloth D C, Sidlow R et al. EPAC 2004. 14584. Ferdinand Robin, Sherman Joseph, Stevens Ralph R et al.PAC 1997. 2723-27255. LI J H, TANG J Y. Nuclear Instruments and Methods in Physics Research Section A, 2007, 574(2): 221-2256. LI J H, TANG J Y, OUYANG H F et al. Nuclear Instruments and Methods in Physics Research Section A (has been submitted)7. Ohmori C, Kanazawa M, Takagi A et al. Nuclear Instruments and Methods in Physics Research A, 2004, 526:215-2218. Chou W, Mori Y, Muto M et al. PAC 1999. 565-5679. Mori Y, Muto M, Ohmori C et al. EPAC 2000. 2468-247010. Mori Y, Muto M, Ohmori C et al. TPAC 2001. 4056-405811. Bailey C P. EPAC 1998. 1162-116412. Jolly S, Pozimski J, Faircloth D et al. EPAC 2006. 1714-1716

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LI Jin-Hai, OUYANG Hua-Fu, FU Shi-Nian, ZHANG Hua-Shun and HE Wei. Design of the low energy beam transport line for the China spallation neutron source[J]. Chinese Physics C, 2008, 32(3): 227-231. doi: 10.1088/1674-1137/32/3/014

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Received: 2007-05-22
Revised: 2007-06-13

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沈阳化工大学材料科学与工程学院沈阳 110142

Design of the low energy beam transport line for the China spallation neutron source

Corresponding author: LI Jin-Hai,

Received Date: 2007-05-22
Accepted Date: 2007-06-13
Available Online: 2008-03-05

Abstract:

The design of the China Spallation Neutron Source (CSNS) low-energy beam transport (LEBT) line, which locates between the ion source and the radio-frequency quadrupole (RFQ), has been completed with the TRACE3D code. The design aims at perfect matching, primary chopping, a small emittance growth and sufficient space for beam diagnostics. The line consists of three solenoids, three vacuum chambers, two steering magnets and a pre-chopper. The total length of LEBT is about 1.74m. This LEBT is designed to transfer 20mA of H-pulsed beam from the ion source to the RFQ. An induction cavity is adopted as the pre-chopper. The electrostatic octupole steerer is discussed as a candidate. A four-quadrant aperture for beam scraping and beam position monitoring is designed.