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Depolarization in polarizing supermirrors

Klauser, Christine; Bigault, Thierry; Böni, Peter; Courtois, Pierre; Devishvili, Anton; Rebrova, Nataliya; Schneider, Michael and Soldner, Torsten (2016) In Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 840. p.181-185
Abstract

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 (FWHM).

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author
publishing date
type
Contribution to journal
publication status
published
subject
keywords
3He-filter, Depolarization, Magnetism, Multilayer, Neutron optics, Polarization, Supermirrors
in
Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
volume
840
pages
5 pages
publisher
Elsevier
external identifiers
  • scopus:84994030755
ISSN
0168-9002
DOI
10.1016/j.nima.2016.09.056
language
English
LU publication?
no
id
fbdb7819-bb39-49b9-b31c-200404996a22
date added to LUP
2016-11-18 10:04:03
date last changed
2017-04-04 07:38:32
@article{fbdb7819-bb39-49b9-b31c-200404996a22,
  abstract     = {<p>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<sup>−4</sup> 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 (FWHM).</p>},
  author       = {Klauser, Christine and Bigault, Thierry and Böni, Peter and Courtois, Pierre and Devishvili, Anton and Rebrova, Nataliya and Schneider, Michael and Soldner, Torsten},
  issn         = {0168-9002},
  keyword      = {3He-filter,Depolarization,Magnetism,Multilayer,Neutron optics,Polarization,Supermirrors},
  language     = {eng},
  month        = {12},
  pages        = {181--185},
  publisher    = {Elsevier},
  series       = {Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment},
  title        = {Depolarization in polarizing supermirrors},
  url          = {http://dx.doi.org/10.1016/j.nima.2016.09.056},
  volume       = {840},
  year         = {2016},
}