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Depolarization in polarizing supermirrors
Inst Laue Langevin, 71 Ave Martyrs, F-38042 Grenoble 9, France.;Univ Vienna, Atominst Tech, Stadionallee 2, A-1020 Vienna, Austria..
Inst Laue Langevin, 71 Ave Martyrs, F-38042 Grenoble 9, France..ORCID iD: 0000-0002-8656-408X
Tech Univ Munich, Phys Dept E21, D-85748 Garching, Germany..
Inst Laue Langevin, 71 Ave Martyrs, F-38042 Grenoble 9, France..
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2016 (English)In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, E-ISSN 1872-9576, Vol. 840, 181-185 p.Article in journal (Refereed) Published
Abstract [en]

We present data on depolarizing effects in polarizing mirrors. At typical magnetizing field strengths used in polarizing devices, depolarizations rise up to the percent level in the specular region and are shown to be successfully suppressed to 10(-4) when increasing the magnetizing field. We show evidence linking a part of this depolarization to lateral correlation of the magnetization fluctuations in the ferromagnetic layers. Effects of the supermirror factor (m), wavelength and incidence angle are studied. The findings are applied to a crossed supermirror geometry and we report a neutron beam polarization of 99.97(1)% for a beam of wavelength = 5.3 angstrom, Delta lambda/lambda = 0.1 (FWHM).

Place, publisher, year, edition, pages
2016. Vol. 840, 181-185 p.
Keyword [en]
Neutron optics, Supermirrors, Depolarization, Magnetism, Multilayer, Polarization, 3He-filter
National Category
Accelerator Physics and Instrumentation Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:uu:diva-324501DOI: 10.1016/j.nima.2016.09.056ISI: 000390825800025OAI: oai:DiVA.org:uu-324501DiVA: diva2:1118532
Available from: 2017-06-30 Created: 2017-06-30 Last updated: 2017-06-30Bibliographically approved

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Bigault, Thierry
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