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Free boundary equilibrium in 3D tokamaks with toroidal rotation
Ecole Polytech Fed Lausanne, Ctr Rech Phys Plasmas, CH-1015 Lausanne, Switzerland..
KTH, School of Electrical Engineering and Computer Science (EECS), Electrical Engineering, Fusion Plasma Physics.ORCID iD: 0000-0001-7741-3370
KTH, School of Electrical Engineering and Computer Science (EECS), Electrical Engineering, Fusion Plasma Physics.
KTH, School of Electrical Engineering and Computer Science (EECS), Electrical Engineering, Fusion Plasma Physics.
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Number of Authors: 11162015 (English)In: Nuclear Fusion, ISSN 0029-5515, E-ISSN 1741-4326, Vol. 55, no 6, article id 063032Article in journal (Refereed) Published
Abstract [en]

The three-dimensional VMEC equilibrium solver has been adapted to numerically investigate the approximate toroidal rotation model we have derived. We concentrate our applications on the simulation of JET snakes and MAST long-lived modes under free boundary conditions. Helical core solutions are triggered when <beta > exceeds a threshold value, typically 2.7% in JET-like plasmas. A large plasma current and edge bootstrap current can drive helical core formations at arbitrarily small <alpha > in which the ideal saturated internal kink coexists with an ideal saturated external kink structure of opposite phase. The centrifugal force linked with the rotation has the effect of displacing the plasma column away from the major axis, but does not alter significantly the magnitude of the edge corrugation of the plasma. Error field correction coil currents in JET-like configurations increase the outer midplane distortions by 2 cm. The edge bootstrap current enhances the edge modulation of the plasma driven by the core snake deformations in MAST.

Place, publisher, year, edition, pages
IOP PUBLISHING LTD , 2015. Vol. 55, no 6, article id 063032
Keywords [en]
3D equilibrium, toroidal rotation, long-lived mode, snake, error field correction coil, saturated ideal kink
Identifiers
URN: urn:nbn:se:kth:diva-272038DOI: 10.1088/0029-5515/55/6/063032ISI: 000356236500034Scopus ID: 2-s2.0-84935892838OAI: oai:DiVA.org:kth-272038DiVA, id: diva2:1423947
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QC 20200416

Available from: 2020-04-16 Created: 2020-04-16 Last updated: 2020-04-16Bibliographically approved

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Bergsåker, HenricBykov, IgorElevant, ThomasFrassinetti, LorenzoGarcia Carrasco, AlvaroHellsten, TorbjörnIvanova, DaryaJonsson, ThomasMenmuir, SheenaPetersson, PerRachlew, ElisabethRubel, MarekStröm, PetterTholerus, SimonWeckmann, Armin

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Bergsåker, HenricBykov, IgorElevant, ThomasFrassinetti, LorenzoGarcia Carrasco, AlvaroHellsten, TorbjörnIvanova, DaryaJonsson, ThomasMenmuir, SheenaPetersson, PerRachlew, ElisabethRubel, MarekStröm, PetterTholerus, SimonWeckmann, Armin
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