18 January 1989 Multilayer Neutron Monochromator And Polarizer Of Double Mirror Type
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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%.
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Seiji Tasaki, Seiji Tasaki, Toru Ebisawa, Toru Ebisawa, Norio Achiwa, Norio Achiwa, Tsunekazu Akiyoshi, Tsunekazu Akiyoshi, Sunao Okamoto, Sunao Okamoto, "Multilayer Neutron Monochromator And Polarizer Of Double Mirror Type", Proc. SPIE 0983, Thin Film Neutron Optical Devices: Mirrors, Supermirrors, Multilayer Monochromators, Polarizers, and Beam Guides, (18 January 1989); doi: 10.1117/12.948756; https://doi.org/10.1117/12.948756


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