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

Journal Article · Wed Jun 15 00:00:00 EDT 2016 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4954727· OSTI ID:22597913

Sales, Morten ^[1]; Plomp, Jeroen; Bouwman, Wim ^[2]; Habicht, Klaus ^[3]; Tremsin, Anton ^[4]; Strobl, Markus ^[1]

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1. Nano-Science Center, Niels Bohr Institute, University of Copenhagen, DK-2100 Copenhagen (Denmark)
2. Faculty of Applied Sciences, Delft University of Technology, 2629 JB Delft (Netherlands)
3. Helmholtz-Zentrum Berlin für Materialen und Energie GmbH, D-14109 Berlin (Germany)
4. Space Sciences Laboratory, University of California at Berkeley, Berkeley, California 94720 (United States)

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.

• OSTI ID: 22597913
• Journal Information: Review of Scientific Instruments, Vol. 87, Issue 6; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BEAMS
DECOUPLING
FREQUENCY DEPENDENCE
GRATINGS
IMAGES
MAGNETIC FIELDS
MODULATION
NEUTRON DIFFRACTION
NEUTRONS
PULSES
SIGNALS
SMALL ANGLE SCATTERING
SPATIAL RESOLUTION
SPIN
SPIN ECHO
SYNCHRONIZATION
TIME-OF-FLIGHT METHOD
WAVELENGTHS