A magnetised foil as inclined π-flipper for time-of-flight neutron beams

A prototype instrument with an inclined ferromagnetic foil was built which was capable of π-flipping over a broad wavelength range of polarised thermal neutrons in a time-of-flight beam. It was found that, for a single foil, polarised neutrons could be flipped in a wavelength range of 0.2–0.5nm with...

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Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 2011-06, Vol.406 (12), p.2467-2469
Main Authors: Duif, C.P., Geurts, S.N., Bouwman, W.G., Rekveldt, M.Th, Plomp, J.
Format: Article
Language:English
Subjects:
Atom and neutron optics
Classical and quantum physics: mechanics and fields
Exact sciences and technology
Magnetised foil
Matter waves
Physics
Polarised neutrons
Polychromatic neutron beam
Spin-echo small-angle neutron scattering
Time-of-flight
π-flipper
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Summary:A prototype instrument with an inclined ferromagnetic foil was built which was capable of π-flipping over a broad wavelength range of polarised thermal neutrons in a time-of-flight beam. It was found that, for a single foil, polarised neutrons could be flipped in a wavelength range of 0.2–0.5nm with an efficiency of 93%. With improved mechanical setup this range probably can even be extended to 0.1–1.0nm. Foil flippers can have some major advantages for polychromatic SESANS over resonance flippers, but the technical realisation with four foils in series will be challenging.
ISSN:0921-4526
1873-2135
DOI:10.1016/j.physb.2011.01.007