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Tearing mode velocity braking due to resonant magnetic perturbations
KTH, School of Electrical Engineering (EES), Fusion Plasma Physics.ORCID iD: 0000-0002-9546-4494
KTH, School of Electrical Engineering (EES), Fusion Plasma Physics.
KTH, School of Electrical Engineering (EES), Fusion Plasma Physics.
KTH, School of Electrical Engineering (EES), Fusion Plasma Physics.ORCID iD: 0000-0002-5259-0458
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2012 (English)In: Nuclear Fusion, ISSN 0029-5515, E-ISSN 1741-4326, Vol. 52, no 10, 103014- p.Article in journal (Refereed) Published
Abstract [en]

The effect of resonant magnetic perturbations (RMPs) on the tearing mode (TM) velocity is studied in EXTRAP T2R. Experimental results show that the RMP produces TM braking until a new steady velocity or wall locking is reached. The braking is initially localized at the TM resonance and then spreads to the other TMs and to the rest of the plasma producing a global velocity reduction via the viscous torque. The process has been used to experimentally estimate the kinematic viscosity profile, in the range 2-40 m 2 s -1, and the electromagnetic torque produced by the RMP, which is strongly localized at the TM resonance. Experimental results are then compared with a theoretical model which gives a reasonable qualitative explanation of the entire process.

Place, publisher, year, edition, pages
2012. Vol. 52, no 10, 103014- p.
Keyword [en]
Electromagnetic torques, Magnetic perturbation, Tearing modes, Theoretical models, Viscous torque
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-103646DOI: 10.1088/0029-5515/52/10/103014ISI: 000309603800015Scopus ID: 2-s2.0-84865853687OAI: oai:DiVA.org:kth-103646DiVA: diva2:561311
Note

QC 20121018

Available from: 2012-10-18 Created: 2012-10-17 Last updated: 2017-12-07Bibliographically approved

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Frassinetti, LorenzoBrunsell, Per R.

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