Journal Article/Contribution to a conference proceedings

FZJ-2019-06852

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png µ -metal magnetic cavities for polarization and maintenance of polarization of 3 He gas

Babcock, E. (Corresponding author)FZJ* ; Salhi, Z.FZJ* ; Barnsley, L.FZJ* ; Voigt, J.FZJ* ; Mattauch, S.FZJ* ; Ioffe, A.FZJ*

2019
IOP Publ.87703 Bristol

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Please use a persistent id in citations: http://hdl.handle.net/2128/23769  doi:10.1088/1742-6596/1316/1/012019

Abstract: Low gradient magnetic holding fields are required for maintaining the polarization of polarized 3He, as diffusion though non-ideal gradients can cause total relaxation rates much greater than the intrinsic total 3He relaxation rate of a particular 3He cell in optimal conditions. For neutron scattering applications we often rely on µ-metal cavities to provide a degree of shielding from the many other sources of magnetic fields and gradient experienced on a typical neutron instrument. The JCNS utilizes two concepts for such cavities, one based on inexpensive plastic-bonded magnets to provide magnetic flux, and the other based on field coils wound on the sides of the µ-metal cavity. 2 different sized of permanent magnet cavities and three different geometries of coil-based cavities have been produced. Both types of boxes will be presented with magnetic design as well as mechanical construction details along with the achieved performance of the constructed devices.

Keyword(s): Instrument and Method Development (1st) ; Instrument and Method Development (2nd) ; Magnetism (2nd) ; Soft Condensed Matter (2nd)

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Contributing Institute(s):

1. JCNS-FRM-II (JCNS-FRM-II)
2. Neutronenstreuung (JCNS-1)
3. Streumethoden (JCNS-2)
4. Heinz Maier-Leibnitz Zentrum (MLZ)

Research Program(s):

1. 524 - Controlling Collective States (POF3-524) (POF3-524)
2. 6212 - Quantum Condensed Matter: Magnetism, Superconductivity (POF3-621) (POF3-621)
3. 6G15 - FRM II / MLZ (POF3-6G15) (POF3-6G15)
4. 6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623) (POF3-623)

Experiment(s):

1. KWS-1: Small angle scattering diffractometer (NL3b)
2. MARIA: Magnetic reflectometer with high incident angle (NL5N)

Appears in the scientific report 2019

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Database coverage:
; ; ; SCOPUS

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