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Imaging of dynamic ...
Imaging of dynamic magnetic fields with spin-polarized neutron beams
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- Tremsin, A. S. (författare)
- University of California, Berkeley
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- Kardjilov, N. (författare)
- Helmholtz Association of German Research Centers
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- Strobl, Markus (författare)
- Lund University,Lunds universitet,European Spallation Source ESS AB,Stiftelser och övriga anknutna verksamheter,Other Institutions and Utilities,University of Copenhagen
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- Manke, I. (författare)
- Helmholtz Association of German Research Centers
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- Dawson, M. (författare)
- Helmholtz Association of German Research Centers
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- McPhate, J. B. (författare)
- University of California, Berkeley
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- Vallerga, J. V. (författare)
- University of California, Berkeley
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- Siegmund, O. H. W. (författare)
- University of California, Berkeley
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Feller, W. B. (författare)
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(creator_code:org_t)
- 2015-04-22
- 2015
- Engelska.
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Ingår i: New Journal of Physics. - : IOP Publishing. - 1367-2630. ; 17
- Relaterad länk:
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http://dx.doi.org/10... (free)
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https://doi.org/10.1...
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https://lup.lub.lu.s...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- NATURVETENSKAP -- Fysik -- Acceleratorfysik och instrumentering (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Accelerator Physics and Instrumentation (hsv//eng)
Nyckelord
- neutron imaging
- magnetic fields
- non-destructive testing
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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