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Study of fast-ion transport induced by fishbones on JET
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2012 (English)In: Nuclear Fusion, ISSN 0029-5515, E-ISSN 1741-4326, Vol. 52, no 9, 094010- p.Article in journal (Refereed) Published
Abstract [en]

The impact of fishbone oscillations onto a confined fast-ion population is simulated for a JET plasma and benchmarked against experiment quantitatively with the help of neutron rate measurements. The transient drops in volume integrated neutron emission are found to be mainly caused by the spatial redistribution of the (neutral beam injected) fast-ion population confined in the plasma rather than by fast-ion loss. The simulations yield a quadratic dependence of the neutron drop on the fishbone amplitude. It is found that the simulations are able to correctly reproduce the magnitude of the experimentally observed drop in volume integrated neutron emission to within a factor 2. Furthermore, frequency chirping is found to be important. Omitting the fishbone frequency chirp in the simulations reduces the magnitude of the neutron rate drop (and hence fast-ion redistribution) to about half its original value.

Place, publisher, year, edition, pages
2012. Vol. 52, no 9, 094010- p.
Keyword [en]
Fishbone, Frequency chirp, Frequency chirping, Neutral beams, Quadratic dependence, Rate measurements
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-103645DOI: 10.1088/0029-5515/52/9/094010ISI: 000308810100011Scopus ID: 2-s2.0-84865844913OAI: oai:DiVA.org:kth-103645DiVA: diva2:561634
Conference
12th IAEA Technical Meeting on Energetic Particles in Magnetic Confinement Systems / 5th IAEA Technical Meeting on Theory of Plasma Wave Instabilities Location: Austin, TX Date: SEP 05-11, 2011
Note

QC 20121019

Available from: 2012-10-19 Created: 2012-10-17 Last updated: 2017-12-07Bibliographically approved

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Johnson, Thomas

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