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Measurement and control of the fast ion redistribution on MAST
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
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2013 (English)In: Nuclear Fusion, ISSN 0029-5515, E-ISSN 1741-4326, Vol. 53, no 5, p. 053016-Article in journal (Refereed) Published
Abstract [en]

Previous experiments on MAST and other tokamaks have indicated that the level of fast ion redistribution can exceed that expected from classical diffusion and that this level increases with beam power. In this paper we present a quantification of this effect in MAST plasmas using a recently commissioned scanning neutron camera. The observed fast ion diffusivity correlates with the amplitude of n = 1 energetic particle modes, indicating that they are the probable cause of the non-classical fast ion diffusion in MAST. Finally, it will be shown that broadening the fast ion pressure profile by the application of neutral beam injection at an off-axis location can mitigate the growth of these modes and result in the classical fast ion behaviour.

Place, publisher, year, edition, pages
2013. Vol. 53, no 5, p. 053016-
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Natural Sciences
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URN: urn:nbn:se:uu:diva-202972DOI: 10.1088/0029-5515/53/5/053016ISI: 000319404700016OAI: oai:DiVA.org:uu-202972DiVA, id: diva2:634763
Available from: 2013-07-01 Created: 2013-07-01 Last updated: 2017-12-06Bibliographically approved

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Cecconello, MarcoSangaroon, SiriyapornWodniak, I.
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