Transverse profile expansion and homogenization at target for the injector Scheme-Ⅰ test stand of China-ADS

YANG Zheng; TANG Jing-Yu; YAN Fang; PEI Shi-Lun; CHEN Yuan; LI Zhi-Hui; GENG Hui-Ping

doi:10.1088/1674-1137/39/2/027001

Chinese Physics C> 2015, Vol. 39> Issue(2) : 027001 DOI: 10.1088/1674-1137/39/2/027001

Transverse profile expansion and homogenization at target for the injector Scheme-Ⅰ test stand of China-ADS

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For the injector Scheme-Ⅰ test stand of the China-ADS (Accelerator Driven subcritical System), a beam with the maximum power of 100 kW will be produced and transported to the beam dump. To solve the very high thermal load problem at the dump, two measures are taken to deal with the huge power density at the target. One is to enlarge the contact area between the beam and the target, and this is to be accomplished by expanding the beam profile at the target and using slanted target plates. The other is to produce a more homogenous beam profile at the target to minimize the maximum power density. Here the beam dump line is designed to meet the requirement of beam expansion and homogenization at 3 different energies (3.2 MeV, 5 MeV and 10 MeV), and the step-like field magnets are employed for the beam spot homogenization. Taking into account the fact that the space charge effects are very strong at such low beam energies, the simulations have included space charge effects and errors which show that the beam line can meet the requirements very well. In the meantime, the alternative beam design using standard multipole magnets is also presented.

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YANG Zheng, TANG Jing-Yu, YAN Fang, PEI Shi-Lun, CHEN Yuan, LI Zhi-Hui and GENG Hui-Ping. Transverse profile expansion and homogenization at target for the injector Scheme-Ⅰ test stand of China-ADS[J]. Chinese Physics C, 2015, 39(2): 027001. doi: 10.1088/1674-1137/39/2/027001

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Received: 2014-03-21
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Transverse profile expansion and homogenization at target for the injector Scheme-Ⅰ test stand of China-ADS

Corresponding author: TANG Jing-Yu,

Received Date: 2014-03-21
Accepted Date: 1900-01-01
Available Online: 2015-02-05

Abstract: For the injector Scheme-Ⅰ test stand of the China-ADS (Accelerator Driven subcritical System), a beam with the maximum power of 100 kW will be produced and transported to the beam dump. To solve the very high thermal load problem at the dump, two measures are taken to deal with the huge power density at the target. One is to enlarge the contact area between the beam and the target, and this is to be accomplished by expanding the beam profile at the target and using slanted target plates. The other is to produce a more homogenous beam profile at the target to minimize the maximum power density. Here the beam dump line is designed to meet the requirement of beam expansion and homogenization at 3 different energies (3.2 MeV, 5 MeV and 10 MeV), and the step-like field magnets are employed for the beam spot homogenization. Taking into account the fact that the space charge effects are very strong at such low beam energies, the simulations have included space charge effects and errors which show that the beam line can meet the requirements very well. In the meantime, the alternative beam design using standard multipole magnets is also presented.