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Impurity transport driven by fishbones in MAST
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
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2015 (English)In: Nuclear Fusion, ISSN 0029-5515, E-ISSN 1741-4326, Vol. 55, no 3, 032002Article in journal (Refereed) Published
Abstract [en]

In MAST, bursting toroidal Alfven eigenmodes and fishbones are observed to give rise to an asymmetric perturbation to the soft x-ray (SXR) emission close to the magnetic axis which grows and decays on the time scale of the fishbone evolution. As the fishbone nears its maximum amplitude, the SXR emission starts to increase (decrease) at radial positions smaller (larger) than the radial position of the magnetic axis. This trend in the SXR emission persists for a few milliseconds, until the fishbone starts to decay in amplitude and the slower overall trend of the SXR emission once again becomes dominant. A preliminary analysis suggests that the change in the SXR emission is due to the localized accumulation of high-Z impurities, sustained against parallel transport by the effects of fishbones on the fast ion population.

Place, publisher, year, edition, pages
2015. Vol. 55, no 3, 032002
Keyword [en]
MAST, fishbone, impurity transport, SXR
National Category
Atom and Molecular Physics and Optics Fusion, Plasma and Space Physics
URN: urn:nbn:se:uu:diva-252246DOI: 10.1088/0029-5515/55/3/032002ISI: 000352020500002OAI: oai:DiVA.org:uu-252246DiVA: diva2:809857
Available from: 2015-05-05 Created: 2015-05-04 Last updated: 2015-05-05Bibliographically approved

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Cecconello, MarcoKlimek, Iwona
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