CHRNS VSANS

NSF: Very Small Angle Neutron Scattering (VSANS)

Neutron spin filters can be applied to measurements requiring different field orientations. The schematic shown above illustrates the use of NSFs on the 30m SANS and Very Small Angle Neutron Scattering (VSANS) instruments. In this example, the NSF is the analyzer for a polarized beam measurement with a horizontal field. For more details, please select the provided links for general {Gentile05, Gentile00} and specific {Chen09, Krycka09} applications. All SANS publications using NSFs can be found here. The following publication describes the VSANS instrumentation: Barker22.

Neutron Polarization Analysis with Kathryn Krycka (mp4 format)

Powerpoint slide provided for presentation use: Neutron Spin Filters on SANS

Specifications for NSFs on VSANS

3He polarization flipping capability Standard wavelengths: \({\lambda}\) = 5 \({\unicode{x212B}}\) and 6 \({\unicode{x212B}}\) Measurable Q range: 0.015 \({\unicode{x212B}}\)-1 - 0.12 \({\unicode{x212B}}\)-1 Sample field: H \({\leq}\) 0.1 T Four cross-section polarization correction 3He transmission: \({\leq}\) 54% (for desired state) Flipping ratio: \({\leq}\) 90 Low Field Setup.pdf Manifold sample holder (up to 3 samples simul.)

3He polarization flipping capability Standard wavelengths: \({\lambda}\) = 5 \({\unicode{x212B}}\) and 6 \({\unicode{x212B}}\) Measurable Q range: 0.015 \({\unicode{x212B}}\)-1 - 0.12 \({\unicode{x212B}}\)-1 Sample field: 5mT \({\leq}\) H \({\leq}\) 1.6 T Four cross-section polarization correction 3He transmission: \({\leq}\) 54% (for desired state) Flipping ratio: \({\leq}\) 90 High Field Setup.pdf Manifold sample holder (up to 3 samples simul.)