WANG Yu, WANG Hong-li, LIU Yun-tao, SUN Kai, WEI Guo-hai, HE Lin-feng, HAN Song-bai, CHEN Dong-feng. Research on Angular Divergence Distribution of Neutron Beam at the End of Neutron Guide[J]. Atomic Energy Science and Technology, 2015, 49(2): 234-239. DOI: 10.7538/yzk.2015.49.02.0234
Citation: WANG Yu, WANG Hong-li, LIU Yun-tao, SUN Kai, WEI Guo-hai, HE Lin-feng, HAN Song-bai, CHEN Dong-feng. Research on Angular Divergence Distribution of Neutron Beam at the End of Neutron Guide[J]. Atomic Energy Science and Technology, 2015, 49(2): 234-239. DOI: 10.7538/yzk.2015.49.02.0234

Research on Angular Divergence Distribution of Neutron Beam at the End of Neutron Guide

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  • The theoretical formulae were deduced based on the principle of total reflection optical geometry, and they can accurately depict the angular divergence distribution of any point at the end of the neutron guide. The theoretical formulae were verified by Monte Carlo simulation. The simulation results show that the angular divergence distribution discontinuous nature will cause the inhomogeneous spatial distribution of the neutron intensity at the sample position, even result in grid dark lines effect. Finally, according to the theory of analytic formula, several effective methods were given, which can reduce or eliminate the grid dark lines effect.
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