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Imaging of dynamic magnetic fields with spin-polarized neutron beams

Tremsin, A. S.; Kardjilov, N.; Strobl, Markus LU ; Manke, I.; Dawson, M.; McPhate, J. B.; Vallerga, J. V.; Siegmund, O. H. W. and Feller, W. B. (2015) In New Journal of Physics 17.
Abstract
Precession of neutron spin in a magnetic field can be used for mapping of a magnetic field distribution, as demonstrated previously for static magnetic fields at neutron beamline facilities. The fringing in the observed neutron images depends on both the magnetic field strength and the neutron energy. In this paper we demonstrate the feasibility of imaging periodic dynamic magnetic fields using a spin-polarized cold neutron beam. Our position-sensitive neutron counting detector, providing with high precision both the arrival time and position for each detected neutron, enables simultaneous imaging of multiple phases of a periodic dynamic process with microsecond timing resolution. The magnetic fields produced by 5- and 15-loop solenoid... (More)
Precession of neutron spin in a magnetic field can be used for mapping of a magnetic field distribution, as demonstrated previously for static magnetic fields at neutron beamline facilities. The fringing in the observed neutron images depends on both the magnetic field strength and the neutron energy. In this paper we demonstrate the feasibility of imaging periodic dynamic magnetic fields using a spin-polarized cold neutron beam. Our position-sensitive neutron counting detector, providing with high precision both the arrival time and position for each detected neutron, enables simultaneous imaging of multiple phases of a periodic dynamic process with microsecond timing resolution. The magnetic fields produced by 5- and 15-loop solenoid coils of 1 cm diameter, are imaged in our experiments with similar to 100 mu m resolution for both dc and 3 kHz ac currents. Our measurements agree well with theoretical predictions of fringe patterns formed by neutron spin precession. We also discuss the wavelength dependence and magnetic field quantification options using a pulsed neutron beamline. The ability to remotely map dynamic magnetic fields combined with the unique capability of neutrons to penetrate various materials (e.g., metals), enables studies of fast periodically changing magnetic processes, such as formation of magnetic domains within metals due to the presence of ac magnetic fields. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
neutron imaging, magnetic fields, non-destructive testing
in
New Journal of Physics
volume
17
publisher
IOP Publishing Ltd.
external identifiers
  • wos:000353940300005
  • scopus:84930645993
ISSN
1367-2630
DOI
10.1088/1367-2630/17/4/043047
language
English
LU publication?
yes
id
4f4543f9-4ba2-4666-bdba-ff5c269697aa (old id 7438995)
date added to LUP
2015-06-24 07:59:39
date last changed
2017-06-26 11:30:49
@article{4f4543f9-4ba2-4666-bdba-ff5c269697aa,
  abstract     = {Precession of neutron spin in a magnetic field can be used for mapping of a magnetic field distribution, as demonstrated previously for static magnetic fields at neutron beamline facilities. The fringing in the observed neutron images depends on both the magnetic field strength and the neutron energy. In this paper we demonstrate the feasibility of imaging periodic dynamic magnetic fields using a spin-polarized cold neutron beam. Our position-sensitive neutron counting detector, providing with high precision both the arrival time and position for each detected neutron, enables simultaneous imaging of multiple phases of a periodic dynamic process with microsecond timing resolution. The magnetic fields produced by 5- and 15-loop solenoid coils of 1 cm diameter, are imaged in our experiments with similar to 100 mu m resolution for both dc and 3 kHz ac currents. Our measurements agree well with theoretical predictions of fringe patterns formed by neutron spin precession. We also discuss the wavelength dependence and magnetic field quantification options using a pulsed neutron beamline. The ability to remotely map dynamic magnetic fields combined with the unique capability of neutrons to penetrate various materials (e.g., metals), enables studies of fast periodically changing magnetic processes, such as formation of magnetic domains within metals due to the presence of ac magnetic fields.},
  articleno    = {043047},
  author       = {Tremsin, A. S. and Kardjilov, N. and Strobl, Markus and Manke, I. and Dawson, M. and McPhate, J. B. and Vallerga, J. V. and Siegmund, O. H. W. and Feller, W. B.},
  issn         = {1367-2630},
  keyword      = {neutron imaging,magnetic fields,non-destructive testing},
  language     = {eng},
  publisher    = {IOP Publishing Ltd.},
  series       = {New Journal of Physics},
  title        = {Imaging of dynamic magnetic fields with spin-polarized neutron beams},
  url          = {http://dx.doi.org/10.1088/1367-2630/17/4/043047},
  volume       = {17},
  year         = {2015},
}