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Proceedings Paper

Multilayer Neutron Monochromator And Polarizer Of Double Mirror Type
Author(s): Seiji Tasaki; Toru Ebisawa; Norio Achiwa; Tsunekazu Akiyoshi; Sunao Okamoto
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Paper Abstract

A multilayer neutron monochromator and polarizer of double mirror type have been developed using a successive double reflection by two multilayer mirror deposited on a Si substrate. The multilayer mirrors have a supermirror-type thickness distribution of bilayers. The monochromator (polarizer) plays simultaneously the roles of a monochromator (polarizer), a collimator and a beam bender through a successive double reflection by the two mirrors. The double reflection brings a low contamination of higher order Bragg reflections. For the monochromator several multilayer mirrors deposited on Si substrates are assembled in the shape of Soller slit to cover a wide neutron beam. The multilayer mirrors for the monochromator are fabricated by depositing Ni and Ti. The bilayer thickness distribution is supermirror-type with the mean thickness of 150 Å and the width of the distribution of 20%. The monochromator provides a monochromatic beam of 5 Å with wavelength resolution of 20%, divergent angle of 1/300 rad and bent angle of 1/15 rad. Peak reflectivity of the monochromator is observed to be 40% for a incident beam with a divergence of 1/240 rad. Available beam size is about 5 cm x 1 cm in a Soller-slit type with 12 sheets of the multilayer mirrors. FeCo-Ti multilayer polarizer and FeCo -V multilayer analyzer have the similar characteristics with the Ni-Ti multilayer monochromator. The polarizing efficiency is about 90%.

Paper Details

Date Published: 18 January 1989
PDF: 5 pages
Proc. SPIE 0983, Thin Film Neutron Optical Devices: Mirrors, Supermirrors, Multilayer Monochromators, Polarizers, and Beam Guides, (18 January 1989); doi: 10.1117/12.948756
Show Author Affiliations
Seiji Tasaki, Kyoto University (Japan)
Toru Ebisawa, Kyoto University (Japan)
Norio Achiwa, Kyushu University (Japan)
Tsunekazu Akiyoshi, Kyoto University (Japan)
Sunao Okamoto, Kyoto University (Japan)

Published in SPIE Proceedings Vol. 0983:
Thin Film Neutron Optical Devices: Mirrors, Supermirrors, Multilayer Monochromators, Polarizers, and Beam Guides
Charles F. Majkrzak, Editor(s)

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