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

Published

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, -1
Conference Title
the 6th European Conference on Neutron Scattering

Keywords

wide angle polarization analysis, wide angle 3He cell, horseshoe-shaped 3He cell, polarized 3He SEOP, 3He NSF
Created October 10, 2016, Updated February 19, 2017