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Reduced models for parallel magnetic field fluctuations and their impact on pressure gradient driven MHD instabilities in axisymmetric toroidal plasmas
Ecole Polytech Fed Lausanne, SPC, CH-1015 Lausanne, Switzerland.
Ecole Polytech Fed Lausanne, SPC, CH-1015 Lausanne, Switzerland.
CNR, IFP, Via R Cozzi 53, I-20125 Milan, Italy.
Ecole Polytech Fed Lausanne, SPC, CH-1015 Lausanne, Switzerland.
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2019 (English)In: Plasma Physics and Controlled Fusion, ISSN 0741-3335, E-ISSN 1361-6587, Vol. 61, no 10, article id 104003Article in journal (Refereed) Published
Abstract [en]

It is well known that parallel magnetic field fluctuations are connected with finite plasma beta effects. It can therefore be expected that Reduced Models that simplify or neglect the parallel magnetic field may not capture the salient physics of all types of pressure gradient driven instabilities. This is particularly true in axisymmetric toroidal plasmas in which pressure driven MHD instabilities are always associated with toroidicty and the coupling of the poloidal mode harmonics. This contribution examines the distinct role of parallel magnetic field perturbations on short and long wavelength pressure driven MHD instabilities, and investigates quantitatively the impact of reduced electromagnetic models frequently deployed in fluid and gyrokinetic codes.

Place, publisher, year, edition, pages
IOP PUBLISHING LTD , 2019. Vol. 61, no 10, article id 104003
Keywords [en]
MHD instabilities, parallel magnetic fluctuations, gyrokinetic codes, fluid codes, analytic solutions
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:uu:diva-394189DOI: 10.1088/1361-6587/ab368bISI: 000484113000001OAI: oai:DiVA.org:uu-394189DiVA, id: diva2:1359260
Available from: 2019-10-08 Created: 2019-10-08 Last updated: 2019-10-08Bibliographically approved

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Wahlberg, Christer

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