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Wavelength-independent constant period spin-echo modulated small angle neutron scattering

Sales, Morten; Plomp, Jeroen; Habicht, Klaus; Tremsin, Anton; Bouwman, Wim and Strobl, Markus LU (2016) In Review of Scientific Instruments 87(6).
Abstract

Spin-Echo Modulated Small Angle Neutron Scattering (SEMSANS) in Time-of-Flight (ToF) mode has been shown to be a promising technique for measuring (very) small angle neutron scattering (SANS) signals and performing quantitative Dark-Field Imaging (DFI), i.e., SANS with 2D spatial resolution. However, the wavelength dependence of the modulation period in the ToF spin-echo mode has so far limited the useful modulation periods to those resolvable with the limited spatial resolution of the detectors available. Here we present our results of an approach to keep the period of the induced modulation constant for the wavelengths utilised in ToF. This is achieved by ramping the magnetic fields in the coils responsible for creating the spatially... (More)

Spin-Echo Modulated Small Angle Neutron Scattering (SEMSANS) in Time-of-Flight (ToF) mode has been shown to be a promising technique for measuring (very) small angle neutron scattering (SANS) signals and performing quantitative Dark-Field Imaging (DFI), i.e., SANS with 2D spatial resolution. However, the wavelength dependence of the modulation period in the ToF spin-echo mode has so far limited the useful modulation periods to those resolvable with the limited spatial resolution of the detectors available. Here we present our results of an approach to keep the period of the induced modulation constant for the wavelengths utilised in ToF. This is achieved by ramping the magnetic fields in the coils responsible for creating the spatially modulated beam in synchronisation with the neutron pulse, thus keeping the modulation period constant for all wavelengths. Such a setup enables the decoupling of the spatial detector resolution from the resolution of the modulation period by the use of slits or gratings in analogy to the approach in grating-based neutron DFI.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Review of Scientific Instruments
volume
87
issue
6
publisher
American Institute of Physics
external identifiers
  • scopus:84977274359
  • wos:000379177000054
ISSN
0034-6748
DOI
10.1063/1.4954727
language
English
LU publication?
yes
id
a6524925-da15-4a3c-9650-bcc0f4276629
date added to LUP
2017-01-26 11:03:50
date last changed
2017-09-18 11:34:17
@article{a6524925-da15-4a3c-9650-bcc0f4276629,
  abstract     = {<p>Spin-Echo Modulated Small Angle Neutron Scattering (SEMSANS) in Time-of-Flight (ToF) mode has been shown to be a promising technique for measuring (very) small angle neutron scattering (SANS) signals and performing quantitative Dark-Field Imaging (DFI), i.e., SANS with 2D spatial resolution. However, the wavelength dependence of the modulation period in the ToF spin-echo mode has so far limited the useful modulation periods to those resolvable with the limited spatial resolution of the detectors available. Here we present our results of an approach to keep the period of the induced modulation constant for the wavelengths utilised in ToF. This is achieved by ramping the magnetic fields in the coils responsible for creating the spatially modulated beam in synchronisation with the neutron pulse, thus keeping the modulation period constant for all wavelengths. Such a setup enables the decoupling of the spatial detector resolution from the resolution of the modulation period by the use of slits or gratings in analogy to the approach in grating-based neutron DFI.</p>},
  articleno    = {063907},
  author       = {Sales, Morten and Plomp, Jeroen and Habicht, Klaus and Tremsin, Anton and Bouwman, Wim and Strobl, Markus},
  issn         = {0034-6748},
  language     = {eng},
  month        = {06},
  number       = {6},
  publisher    = {American Institute of Physics},
  series       = {Review of Scientific Instruments},
  title        = {Wavelength-independent constant period spin-echo modulated small angle neutron scattering},
  url          = {http://dx.doi.org/10.1063/1.4954727},
  volume       = {87},
  year         = {2016},
}