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Fast growing resistive two fluid instabilities in hybrid-like tokamak configuration
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
2014 (English)In: Plasma Physics and Controlled Fusion, ISSN 0741-3335, E-ISSN 1361-6587, Vol. 56, no 7, 075025- p.Article in journal (Refereed) Published
Abstract [en]

An analytic derivation of the dispersion relation for resistive instabilities in a low-shear tokamak configuration is presented. The resistive infernal mode model (Charlton et al 1989 Phys. Fluids B 1 798) is generalized to include plasma diamagnetism, subsonic equilibrium toroidal flow shear and viscosity. An estimate of the transition point between the fast S-3/13 infernal-like (S is the Lundquist number) and the slow S-3/5 tearing-like scaling is given. A novel S-3/8 scaling is found close to the ideal ion-diamagnetic magnetohydrodynamic stability boundary. New moderately fast scalings in S are also found when sheared toroidal E x B flow and viscosity are considered. An analytic treatment of the m = n = 1 quasi-interchange mode in presence of density gradients with flat temperature profiles has been made.

Place, publisher, year, edition, pages
2014. Vol. 56, no 7, 075025- p.
Keyword [en]
magnetohydrodynamics, tokamak, low-shear, hybrid
National Category
Physical Sciences
URN: urn:nbn:se:uu:diva-229440DOI: 10.1088/0741-3335/56/7/075025ISI: 000338515300026OAI: oai:DiVA.org:uu-229440DiVA: diva2:736744
Available from: 2014-08-08 Created: 2014-08-07 Last updated: 2014-08-08Bibliographically approved

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Wahlberg, C.
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