RF neutron spin flippers in time of flight Spin-Echo Resolved Grazing Incidence Scattering (SERGIS)
S.R. Parnell (TU Delft - RST/Fundamental Aspects of Materials and Energy)
R. M. Dalgliesh (Rutherford Appleton Laboratory)
N.J. Steinke (Rutherford Appleton Laboratory)
Jeroen Plomp (TU Delft - RID/TS/Technici Pool)
A.A. van Well (TU Delft - RID/Algemeen/Bedrijfsondersteuning)
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Abstract
RF coils have been routinely used for Larmor labelling on the Offspec instrument at ISIS. These coils encode directional information via the neutron polarization using a series of parallelogram-shaped pole shoes which can be tuned to different angles with an RF gradient flipper in the centre of each magnet. We report on measurements of the magnetic field integral through the coils in reflection geometry for a range of scattering angles and different pole shoe angles. Such information is mapped out by measuring the phase of the neutron polarisation and the measurements are discussed in light of data on patterned silicon gratings with a dewetted polymer and the visibility of in-plane structures to SERGIS.
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