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Radial electric field evolution in various operational modes in the TUMAN-3M tokamak
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2008 (English)In: Journal of Physics, Conference Series, ISSN 1742-6588, E-ISSN 1742-6596, Vol. 123, 012010- p.Article in journal (Refereed) Published
Abstract [en]

Radial electric field evolution has been studied on the TUAMN-3M tokamak in different modes of operation: ohmic and NBI heating, L- and H-modes, with and without strong MHD activity. Peripheral radial electric field was measured using Langmuire probes, which were inserted up to 2cm inside LCFS, while core plasma potential evolution was measured using HIBP diagnostic. It was found, that in presence of strong MHD activity radial electric field in a vicinity of the island changed sign from negative to positive and could reach up to 4kV/m. Central plasma potential exhibited a positive perturbation of ∼700V during the MHD burst. This positive radial electric field might lead to H-mode termination, both in ohmic and NBI heating cases. Possible mechanism of the positive Er generation, namely the electron losses along ergodized magnetic field lines in the presence of MHD-island, is discussed. The same mechanism might be responsible for the positive potential spikes during a saw-tooth crash, also observed using HIBP. Another phenomenon observed using HIBP was quasi-coherent potential oscillations with the frequency close to one of the GAM. Possible location of these oscillations in the core region r/a ∼ 0.33 is discussed.

Place, publisher, year, edition, pages
2008. Vol. 123, 012010- p.
National Category
Fusion, Plasma and Space Physics
URN: urn:nbn:se:kth:diva-154102DOI: 10.1088/1742-6596/123/1/012010ISI: 000263553100010ScopusID: 2-s2.0-65249102678OAI: diva2:758747

QC 20141028

Available from: 2014-10-28 Created: 2014-10-14 Last updated: 2014-10-28Bibliographically approved

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Tendler, Michael
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Fusion Plasma PhysicsAlfvén Laboratory Centre for Space and Fusion Plasma Physics
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