National Institute of Standards and Technology

NSF: Small Angle Neutron Scattering

Schematic of Neutron Spin Filter on ng3 SANS

Schematic of NSF on SANS

Schematic from Kathryn Krycka

Neutron spin filters can be applied to measurements requiring different field orientations. The schematic shown above illustrates the use of NSFs on the ng3 SANS. 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.

Specifications for NSF on NG3 SANS

³He cell analyzer only (under low vacuum)

³He polarization flipping capability

Wavelengths: λ = 5 Å or 7.5 Å

Measurable Q range: 0.015 Å^-1 - 0.11 Å^-1 (max 2θ: 5.6° (4.7°) small (large) solenoid)

Sample field: H ≤ 1.2 Tesla

Four cross-section polarization correction

³He transmission: ≤ 45% (for desired spin state)

Flipping ratio: ≤ 20

Scientific Application Contacts

Name Office Phone E-mail

Paul Butler (SANS Team Leader) (301)975-2028 paul.butler@nist.gov

Andrew Jackson (Instrument Contact) (301)975-3146 andrew.jackson@nist.gov

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Last modified 8-31-10

Name	Office Phone	E-mail
Paul Butler (SANS Team Leader)	(301)975-2028	paul.butler@nist.gov
Andrew Jackson (Instrument Contact)	(301)975-3146	andrew.jackson@nist.gov