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Extension of the operation mode of back-streaming white neutron beam at the China spallation neutron source

Xiaolong Gaoa,Hantao Jing, Chun-Gui Duan,Binbin Tian,Yang Li, Xiaoguang Yang, Jiandong Sun, Weilin Huang

arXiv (Cornell University)(2021)

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Abstract
The back-streaming white neutron source (Back-n) is a comprehensive neutron experimental platform for nuclear data measurement, nuclear astrophysics, neutron irradiation, detector calibration, etc. In order to meet a variety of experimental requirements, an attempt of various combinations of collimators has been made for the current collimation system. The basic parameters such as beam flux and beam spot characteristics under different beam operation modes have been studied. According to the change of the CSNS proton beam operation mode, the influence of different proton beam spots on the Back-n beam is also studied. The study finds that some beam modes with new collimator combinations can meet the experimental requirements and greatly shorten the experimental time. In addition, we have found a parameterized formula for the uniform beam spot of the high-power proton beam based on the beam monitor data, which provides a more accurate proton-beam source term for future white neutron beam physics and application researches.
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Key words
white neutron beam,back-streaming
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