Beam-transport optimization for cold-neutron spectrometer
We report the design of the beam-transport system (especially the vertical geometry) for a cold-neutron disk-chopper spectrometer AMATERAS at J-PARC. Based on the elliptical shape, which is one of the most effective geometries for a ballistic mirror, the design was optimized to obtain, at the sampl...
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2015-01-01
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Online Access: | http://dx.doi.org/10.1051/epjconf/20158303011 |
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doaj-15abef2f9af847f5888cb8c2a3bc25422021-08-02T05:03:05ZengEDP SciencesEPJ Web of Conferences2100-014X2015-01-01830301110.1051/epjconf/20158303011epjconf-Qens-Wins2014_03011Beam-transport optimization for cold-neutron spectrometerNakajima Kenji0Ohira-Kawamura Seiko1Kikuchi Tatsuya2Kajimoto Ryoichi3Takahashi Nobuaki4Nakamura Mitsutaka5Soyama Kazuhiko6Osakabe Toyotaka7Materials & Life Science Division, J-PARC CenterMaterials & Life Science Division, J-PARC CenterMaterials & Life Science Division, J-PARC CenterMaterials & Life Science Division, J-PARC CenterInstitute for Chemical Research, Kyoto UniversityMaterials & Life Science Division, J-PARC CenterMaterials & Life Science Division, J-PARC CenterQuantum Beam Science Directorate, Japan Atomic Energy Agency We report the design of the beam-transport system (especially the vertical geometry) for a cold-neutron disk-chopper spectrometer AMATERAS at J-PARC. Based on the elliptical shape, which is one of the most effective geometries for a ballistic mirror, the design was optimized to obtain, at the sample position, a neutron beam with high flux without serious degrading in divergence and spacial homogeneity within the boundary conditions required from actual spectrometer construction. The optimum focal point was examined. An ideal elliptical shape was modified to reduce its height without serious loss of transmission. The final result was adapted to the construction requirements of AMATERAS. Although the ideas studied in this paper are considered for the AMATERAS case, they can be useful also to other spectrometers in similar situations. http://dx.doi.org/10.1051/epjconf/20158303011 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Nakajima Kenji Ohira-Kawamura Seiko Kikuchi Tatsuya Kajimoto Ryoichi Takahashi Nobuaki Nakamura Mitsutaka Soyama Kazuhiko Osakabe Toyotaka |
spellingShingle |
Nakajima Kenji Ohira-Kawamura Seiko Kikuchi Tatsuya Kajimoto Ryoichi Takahashi Nobuaki Nakamura Mitsutaka Soyama Kazuhiko Osakabe Toyotaka Beam-transport optimization for cold-neutron spectrometer EPJ Web of Conferences |
author_facet |
Nakajima Kenji Ohira-Kawamura Seiko Kikuchi Tatsuya Kajimoto Ryoichi Takahashi Nobuaki Nakamura Mitsutaka Soyama Kazuhiko Osakabe Toyotaka |
author_sort |
Nakajima Kenji |
title |
Beam-transport optimization for cold-neutron spectrometer |
title_short |
Beam-transport optimization for cold-neutron spectrometer |
title_full |
Beam-transport optimization for cold-neutron spectrometer |
title_fullStr |
Beam-transport optimization for cold-neutron spectrometer |
title_full_unstemmed |
Beam-transport optimization for cold-neutron spectrometer |
title_sort |
beam-transport optimization for cold-neutron spectrometer |
publisher |
EDP Sciences |
series |
EPJ Web of Conferences |
issn |
2100-014X |
publishDate |
2015-01-01 |
description |
We report the design of the beam-transport system (especially the vertical geometry) for a cold-neutron disk-chopper spectrometer AMATERAS at J-PARC. Based on the elliptical shape, which is one of the most effective geometries for a ballistic mirror, the design was optimized to obtain, at the sample position, a neutron beam with high flux without serious degrading in divergence and spacial homogeneity within the boundary conditions required from actual spectrometer construction. The optimum focal point was examined. An ideal elliptical shape was modified to reduce its height without serious loss of transmission. The final result was adapted to the construction requirements of AMATERAS. Although the ideas studied in this paper are considered for the AMATERAS case, they can be useful also to other spectrometers in similar situations.
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url |
http://dx.doi.org/10.1051/epjconf/20158303011 |
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