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The effect of plasma profile variation on the stability of the n=1 internal kink mode in rotating tokamak plasmas
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
2010 (English)In: Nuclear Fusion, ISSN 0029-5515, E-ISSN 1741-4326, Vol. 50, no 2, 025018- p.Article in journal (Refereed) Published
Abstract [en]

The sensitivity of the stability of the ideal n = 1 internal kink mode to variations in the plasma profiles is analysed both analytically and numerically in rotating tokamak plasmas. These stability analyses have been carried out including the centrifugal effects of toroidal plasma rotation upon the equilibrium, and also inconsistently when the equilibrium is treated as static. The change in plasma stability due to rotation is partially (consistent equilibrium) or wholly (inconsistent treatment) determined by the radial profiles of the plasma density and rotation velocity. It is found that the internal kink mode stability is strongly influenced by small variations in these plasma profiles. The implications of this extreme sensitivity are discussed, with particular reference to experimental data from MAST.

Place, publisher, year, edition, pages
2010. Vol. 50, no 2, 025018- p.
National Category
Physical Sciences
URN: urn:nbn:se:uu:diva-137128DOI: 10.1088/0029-5515/50/2/025018ISI: 000275322200023OAI: oai:DiVA.org:uu-137128DiVA: diva2:377901
Available from: 2010-12-15 Created: 2010-12-15 Last updated: 2013-03-11

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Wahlberg, Christer
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