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Safety factor corrections to the magnetohydrodynamic internal kink mode in a tokamak
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Astronomy and Space Physics.
2007 (English)In: Physics of Plasmas, ISSN 1070-664X, E-ISSN 1089-7674, Vol. 14, no 8, 082504- p.Article in journal (Refereed) Published
Abstract [en]

It has long been acknowledged that the well known and frequently used stability criterion beta_p < 0.3 for the toroidal ideal magnetohydrodynamic internal kink mode in a tokamak is inaccurate for an empirically relevant safety factor. The present paper outlines the severity of the usual approximation, and presents improved analytical approximations of the general solution in M. N. Bussac, R. Pellat, D. Edery, and J. L. Soulé, Phys. Rev. Lett. 35, 1638 (1975), thus providing new insights into the nature of the instability, together with simple formulas that can be incorporated into transport codes with sawtooth cycle algorithms.

Place, publisher, year, edition, pages
2007. Vol. 14, no 8, 082504- p.
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Physical Sciences
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URN: urn:nbn:se:uu:diva-14318DOI: 10.1063/1.2759192ISI: 000249156600035OAI: oai:DiVA.org:uu-14318DiVA: diva2:42088
Available from: 2008-01-29 Created: 2008-01-29 Last updated: 2017-12-11Bibliographically approved

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Wahlberg, Christer

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