Recent advancements of wide-angle polarization analysis with 3He neutron spin filters

被引：12
|
作者：
Chen, W. C. [1 ,2 ]
Gentile, T. R. [1 ]
Ye, Q. [1 ,2 ]
Kirchhoff, A. [1 ]
Watson, S. M. [1 ]
Rodriguez-Rivera, J. A. [1 ,2 ]
Qiu, Y. [1 ]
Broholm, C. [1 ,3 ]
机构：
[1] NIST, Gaithersburg, MD 20899 USA
[2] Univ Maryland, College Pk, MD 20742 USA
[3] Johns Hopkins Univ, Baltimore, MD 21218 USA
来源：
VI EUROPEAN CONFERENCE ON NEUTRON SCATTERING (ECNS2015) | 2016年 / 746卷
基金：
美国国家科学基金会;
关键词：
wide angle polarization analysis; wide angle He-3 cell; horseshoe-shaped He-3 cell; polarized He-3 SEOP; He-3; NSF;
D O I：
10.1088/1742-6596/746/1/012016
中图分类号：
O57 [原子核物理学、高能物理学];
学科分类号：
070202 ;
摘要：
Wide-angle polarization analysis with polarized He-3 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 He-3 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 He-3 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 He-3 polarization relaxation time. Finally, we present the results of recent development of horseshoe-shaped wide angle cells.
引用
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页数：10
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