3He spin filters for a thermal neutron triple axis spectrometer

被引：31

作者：

Chen, W. C. ^{[1
]}

Armstrong, G.

Chen, Y.

Collett, B.

Erwin, R.

Gentile, T. R.

Jones, G. L.

Lynn, J. W.

McKenney, S.

Steinberg, J. E.

机构：

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

[2] Indiana Univ, Bloomington, IN 47408 USA

[3] Univ Maryland, College Pk, MD 20742 USA

[4] Hamilton Coll, Clinton, NY 13323 USA

来源：

PHYSICA B-CONDENSED MATTER | 2007年 / 397卷 / 1-2期

关键词：

asperomagnets; mesostructure; depolarizing inhomogeneities; static chirality;

D O I：

10.1016/j.physb.2007.02.053

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We have tested two He-3 neutron spin filters (NSF), one for the polarizer and one for the analyzer, in conjunction with a doubly focusing pyrolytic graphite (PG) monochromator on the state-of-the-art BT-7 thermal triple axis spectrometer (TAS) at the National Institute of Standards and Technology (NIST) Center for Neutron Research (NCNR). This system will provide significantly better neutronic performance for polarization analysis over a conventional TAS with Heusler crystals. We discuss the scheme for employing NSFs on the TAS instrument, including the He-3 cell design, spin-exchange optical pumping (SEOP) of these large He-3 cells, and the holding fields on the spectrometer. Using Rb/K hybrid SEOP, we have produced 75% He-3 polarization for the I I cm diameter cells for TAS in less than two days. (c) 2007 Published by Elsevier B.V.

引用

页码：168 / 171

页数：4

共 11 条

[1] First results from Tyrex, the new polarized-3He filling station at ILL [J].

Andersen, KH ;

Chung, R ;

Guillard, V ;

Humblot, H ;

Jullien, D ;

Lelièvre-Berna, E ;

Petoukhov, A ;

Tasset, F .

PHYSICA B-CONDENSED MATTER, 2005, 356 (1-4) :103-108

[2] Hybrid spin-exchange optical pumping of 3He -: art. no. 123003 [J].

Babcock, E ;

Nelson, I ;

Kadlecek, S ;

Driehuys, B ;

Anderson, LW ;

Hersman, FW ;

Walker, TG .

PHYSICAL REVIEW LETTERS, 2003, 91 (12)

[3] 3He spin filter for neutrons [J].

Batz, M ;

Baessler, S ;

Heil, W ;

Otten, EW ;

Rudersdorf, D ;

Schmiedeskamp, J ;

Sobolev, Y ;

Wolf, M .

JOURNAL OF RESEARCH OF THE NATIONAL INSTITUTE OF STANDARDS AND TECHNOLOGY, 2005, 110 (03) :293-298

[4] Polarized neutron reflectometry of a patterned magnetic film with a 3He analyzer and a position-sensitive detector [J].

Chen, WC ;

Gentile, TR ;

O'Donovan, KV ;

Borchers, JA ;

Majkrzak, CF .

REVIEW OF SCIENTIFIC INSTRUMENTS, 2004, 75 (10) :3256-3263

[5]

CHEN WC, IN PRESS PHYS REV A

[6] Polarized 3He spin filters in neutron scattering [J].

Gentile, TR ;

Babcock, E ;

Borchers, JA ;

Chen, WC ;

Hussey, D ;

Jones, GL ;

Lee, WT ;

Majkzrak, CF ;

O'Donovan, KV ;

Snow, WM ;

Tong, X ;

Velthuis, SGET ;

Walker, TG ;

Yan, H .

PHYSICA B-CONDENSED MATTER, 2005, 356 (1-4) :96-102

[7] The 3He filter on a polarized thermal neutron three-axis spectrometer [J].

Kulda, J ;

Wildes, A ;

Martin-Martin, A ;

Muller, W ;

Heil, W ;

Humblot, H ;

Tasset, F .

PHYSICA B, 1997, 241 :136-138

[8] GASEOUS HE-3 HE-3 MAGNETIC DIPOLAR SPIN RELAXATION [J].

NEWBURY, NR ;

BARTON, AS ;

CATES, GD ;

HAPPER, W ;

MIDDLETON, H .

PHYSICAL REVIEW A, 1993, 48 (06) :4411-4420

[9]

Shirane G., 2002, NEUTRON SCATTERING T, DOI [10.1017/CBO9780511534881, DOI 10.1017/CBO9780511534881]

[10] MACS low-background doubly focusing neutron monochromator [J].

Smee, SA ;

Orndorff, JD ;

Scharfstein, GA ;

Qiu, Y ;

Brand, PC ;

Broholm, CL ;

Anand, DK .

APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING, 2002, 74 (Suppl 1) :S255-S257

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