Electromagnetic modeling of the CSNS H<SUP>-</SUP> ion source extraction system

WU Xiao-Bing; OUYANG Hua-Fu

doi:10.1088/1674-1137/36/4/014

Chinese Physics C> 2012, Vol. 36> Issue(4) : 371-375 DOI: 10.1088/1674-1137/36/4/014

Electromagnetic modeling of the CSNS H^- ion source extraction system

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Abstract：
A Penning surface H^- ion source test stand has been developed for the China Spallation Neutron Source (CSNS) at the Institute of High Energy Physics (IHEP). H^- beams with a current up to 50 mA and a pulse length up to 520μs at a repetition rate of 25 Hz are obtained at present. In order to improve the extraction system based on both the results of the emittance measurements in experiment and the simulation results of the effect of the extraction system on the beam emittance, three dimensional electromagnetic finite element analysis and particle tracking are undertaken. First, the magnetic field of the deflecting magnet is studied in detail, and then the effect of the extraction geometry on the beam transport is also investigated.

References

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WEI J, FU S N, TANG J Y. Chinese Physics C (HEP NP), 2009, 33(11): 1033-10422 Faircloth D C, Thomason J W G, Whitehead M O. Review of Scienti c Instruments, 2004, 75(5): 1735-17373 Faircloth D C, Letchford A P, Gabor C et al. Review of Scienti c Instruments, 2008, 79(2): 02B7174 Faircloth D C, Lawrie S, Letchford A P et al. Review of Scienti c Instruments, 2010, 81(2): 02A7215 WU X B, OUYANG H F, CHI Y L et al. Chinese Physics C (HEP NP), 2011, 35(7): 679-6836 Lawrie S R, Faircloth D C, Letchford A P. Modi cations to the Analysing Magnet in the ISIS Penning Ion Source. In: Proceedings of EPAC. Genoa: Perir-Jean-Genaz C, 2008.427-4297 Pierce J R. Theory and Design of Electron Beams. 2nd ed. New York: Van Nostrand, 19548 Lawrie S R, Faircloth D C, Whitehead M O et al. AIP Conference Proceedings, 2009, 1097(1): 253-2629 Faircloth D C, Whitehead M O, Wood T W. Study of the Post Extraction Acceleration Gap in the ISIS H?? Penning Ion Source. In: Proceedings of EPAC. Genoa: Perir-JeanGenaz C, 2008. 406-408

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WU Xiao-Bing and OUYANG Hua-Fu. Electromagnetic modeling of the CSNS H^- ion source extraction system[J]. Chinese Physics C, 2012, 36(4): 371-375. doi: 10.1088/1674-1137/36/4/014

WU Xiao-Bing and OUYANG Hua-Fu. Electromagnetic modeling of the CSNS H^- ion source extraction system[J]. Chinese Physics C, 2012, 36(4): 371-375. doi: 10.1088/1674-1137/36/4/014 shu

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Received: 2011-07-06
Revised: 2011-07-25

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沈阳化工大学材料科学与工程学院沈阳 110142

Electromagnetic modeling of the CSNS H^- ion source extraction system

WU Xiao-Bing
OUYANG Hua-Fu

Received Date: 2011-07-06
Accepted Date: 2011-07-25
Available Online: 2012-04-05

Abstract: A Penning surface H^- ion source test stand has been developed for the China Spallation Neutron Source (CSNS) at the Institute of High Energy Physics (IHEP). H^- beams with a current up to 50 mA and a pulse length up to 520μs at a repetition rate of 25 Hz are obtained at present. In order to improve the extraction system based on both the results of the emittance measurements in experiment and the simulation results of the effect of the extraction system on the beam emittance, three dimensional electromagnetic finite element analysis and particle tracking are undertaken. First, the magnetic field of the deflecting magnet is studied in detail, and then the effect of the extraction geometry on the beam transport is also investigated.