Continuously operating compact 3He-based neutron spin filter

被引：15

作者：

Jones, GL ^{[1
]}

Baker, J

Chen, WC

Collett, B

Cowan, JA

Dias, MF

Gentile, TR

Hoffmann, C

Koetzle, T

Lee, WT

Littrell, K

Miller, M

Schultz, A

Snow, WM

Tong, X

Yan, H

Yue, A

机构：

[1] Hamilton Coll, Dept Phys, Clinton, NY 13323 USA

[2] Natl Inst Stand & Technol, Gaithersburg, MD 20899 USA

[3] Spallat Neutron Source, Oak Ridge, TN 37831 USA

[4] Indiana Univ, Bloomington, IN 47408 USA

[5] Argonne Natl Lab, Argonne, IL 60439 USA

来源：

PHYSICA B-CONDENSED MATTER | 2005年 / 356卷 / 1-4期

关键词：

helium; neutron; optical pumping; polarization diffraction; spin filter;

D O I：

10.1016/j.physb.2004.10.054

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Polarized 3 He can be used as a spin filter to polarize a broad energy spectrum of neutrons. As a prototype for use on the single-crystal diffractometer (SCD) at the spallation neutron source (SNS), we have built a compact system to continuously polarize a He-3 spin filter by spin-exchange optical pumping. Polarizing in the neutron beam provides a constant neutron polarization and reduces the sensitivity to relaxation mechanisms. The capability to operate in the presence of non-optimal magnetic field homogeneity allowed us to employ a highly compact solenoid only 9.5 cm in diameter and 20cm long. Using only 7W of laser light we maintained 44% (3)Hc polarization in an 11cm(3) cell, despite an overall cell relaxation time of approximate to 10h. Results from a test on the SCD at IPNS are discussed. Published by Elsevier B.V.

引用

收藏

页码：86 / 90

页数：5

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