Recent Advancements of Wide-Angle Polarization Analysis with 3He neutron Spin Filters

Published

October 10, 2016

Author(s)

WangChun Chen, Thomas R. Gentile, Qiang NMN Ye, A. Kirchhoff, Shannon Watson, Jose A. Rodriguez, Yiming Qiu, Collin L. Broholm

Abstract

Wide-angle polarization analysis with polarized ³He based neutron spin filters (NSFs) has recently been employed on the Multi-Axis Crystal Spectrometer (MACS) at the National Institute of Standards and Technology Center for Neutron Research (NCNR). Over the past several years, the apparatus has undergone many upgrades to address the fundamental requirements for wide angle polarization analysis using spin exchange optical pumping based ³He NSFs. In this paper, we report substantial improvements in the on-beam-line performance of the apparatus and progress toward routine user capability. We discuss new standard samples used for ³He NSF characterization and the flipping ratio measurement on MACS. We further discuss the management of stray magnetic fields produced by operation of superconducting magnets on the MACS instrument, which can significantly reduce the ³He polarization relaxation time. Finally, we present the results of recent development of horseshoe-shaped wide angle cells.

Volume

746

Conference Dates

August 30-September 4, 2015

Conference Location

Zaragoza

Conference Title

the 6th European Conference on Neutron Scattering

Pub Type

Conferences

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Keywords

wide angle polarization analysis, wide angle 3He cell, horseshoe-shaped 3He cell, polarized 3He SEOP, 3He NSF

Citation

Chen, W. , , T. , , Q. , Kirchhoff, A. , Watson, S. , Rodriguez, J. , Qiu, Y. and Broholm, C. (2016), Recent Advancements of Wide-Angle Polarization Analysis with ³He neutron Spin Filters, the 6th European Conference on Neutron Scattering, Zaragoza, -1, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=921648 (Accessed October 24, 2025)