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- W2015384610 abstract "Neutron guide tubes are essential features of many neutron beam instruments. Even though detailed analysis of practical systems including guide curvature and reflectivity losses may require numerical calculation, analytical methods such as the present one are useful for understanding idealized systems and for assessing the accuracy of numerical methods. We use a technique which is an adaptation of one used in the analysis of particle transport in accelerators, describing trajectories in the transverse (i.e. position and angle) phase space of the neutrons. Similar methods are well known in neutron optics which have been used to calculate transmissions of neutron choppers and guides, and which rest upon representations in either two momentum or two spatial dimensions. We derive expressions for the gain (ratio of the total neutron current through the guide to the total current without internal reflections) of parallel-sided one-dimensional neutron guide tubes, explicitly including the effects of a remote finite source. We identify several distinct cases. For the realistic situation of a two-dimensional guide of rectangular cross section, the gain is the product of gains computed for the one-dimensional systems in each dimension." @default.
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- W2015384610 date "1982-05-01" @default.
- W2015384610 modified "2023-09-25" @default.
- W2015384610 title "Neutron guide tube gain for a remote finite source" @default.
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- W2015384610 doi "https://doi.org/10.1016/0029-554x(82)90097-0" @default.
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