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

作者：Duif C P^*; Geurts S N; Bouwman W G; Rekveldt M Th; Plomp J

来源：Physica B: Condensed Matter , 2011, 406(12): 2467-2469.

DOI：10.1016/j.physb.2011.01.007

• pi-flipper
• Magnetised foil
• Polychromatic neutron beam
• Time-of-flight
• Polarised neutrons
• Spin-echo small-angle neutron scattering

A prototype instrument with an inclined ferromagnetic foil was built which was capable of pi-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 0.2-0.5 nm with an efficiency of 93%. With improved mechanical setup this range probably can even be extended to 0.1-1.0 nm. 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.

• 出版日期2011-6