Spin echo small-angle neutron scattering using superconducting magnetic Wollaston prisms
Fumiaki Funama (Oak Ridge National Laboratory)
Caitlyn M. Wolf (National Institute of Standards and Technology)
Katie Weigandt (National Institute of Standards and Technology)
Jiazhou Shen (Indiana University)
S. R. Parnell (TU Delft - RID/TS/Instrumenten groep, Rutherford Appleton Laboratory)
Fankang Li (Oak Ridge National Laboratory)
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Abstract
We show the implementation of superconducting magnetic Wollaston prisms for spin echo small-angle neutron scattering. Two calibration methods for the spin echo length are presented: one utilizing spin echo modulated small-angle neutron scattering and the other based on the neutron refraction by quartz wedge crystals. Our experimental results with polystyrene nano-particle colloids showcase the system’s efficacy in measuring both dilute and concentrated colloidal systems. Additionally, investigations into the pore diameter and pitch of a nano-porous alumina membrane demonstrate its capability in analyzing nano-porous materials. Furthermore, we discuss potential optimizations to further extend the accessible spin echo length.