Study on collimation and shielding of the back-streaming neutrons at the CSNS target

JING Han-Tao; TANG Jing-Yu; YANG Zheng

doi:10.1088/1674-1137/37/11/117002

Chinese Physics C> 2013, Vol. 37> Issue(11) : 117002 DOI: 10.1088/1674-1137/37/11/117002

Study on collimation and shielding of the back-streaming neutrons at the CSNS target

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The back-streaming neutrons from the spallation target at CSNS are very intense,and can pose serious damage problems for the devices in the accelerator-target interface region. To tackle the problems,a possible scheme for this region was studied,namely a specially designed optics for the proton beam line produces two beam waists,and two collimators are placed at the two waist positions to maximize the collimation effect of the back-streaming neutrons. Detailed Monte Carlo simulations with the beams in the two different CSNS phases show the effectiveness of the collimation system,and the radiation dose rate decreases largely in the interface section. This can ensure the use of epoxy coils for the last magnets and other devices in the beam transport line with reasonable lifetimes,e.g.,thirty years. The design philosophy for such an accelerator-target interface region can also be applicable to other high-power proton beam applications.

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JING Han-Tao, TANG Jing-Yu and YANG Zheng. Study on collimation and shielding of the back-streaming neutrons at the CSNS target[J]. Chinese Physics C, 2013, 37(11): 117002. doi: 10.1088/1674-1137/37/11/117002

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Received: 2013-01-04
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

Study on collimation and shielding of the back-streaming neutrons at the CSNS target

Received Date: 2013-01-04
Accepted Date: 1900-01-01
Available Online: 2013-11-05

Abstract: The back-streaming neutrons from the spallation target at CSNS are very intense,and can pose serious damage problems for the devices in the accelerator-target interface region. To tackle the problems,a possible scheme for this region was studied,namely a specially designed optics for the proton beam line produces two beam waists,and two collimators are placed at the two waist positions to maximize the collimation effect of the back-streaming neutrons. Detailed Monte Carlo simulations with the beams in the two different CSNS phases show the effectiveness of the collimation system,and the radiation dose rate decreases largely in the interface section. This can ensure the use of epoxy coils for the last magnets and other devices in the beam transport line with reasonable lifetimes,e.g.,thirty years. The design philosophy for such an accelerator-target interface region can also be applicable to other high-power proton beam applications.