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Gyrokinetic simulations of toroidal Alfven eigenmodes excited by energetic ions and external antennas on the Joint European Torus
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
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Number of Authors: 12472019 (English)In: Nuclear Fusion, ISSN 0029-5515, E-ISSN 1741-4326, Vol. 59, no 2, article id 026008Article in journal (Refereed) Published
Abstract [en]

The gyrokinetic toroidal code (GTC) has been used to study toroidal Alfven eigenmodes (TAEs) in high-performance plasmas. Experiments performed at the Joint European Torus (JET), where TAEs were driven by energetic particles arising from neutral beams, ion cyclotron resonant heating, and resonantly excited by dedicated external antennas, have been simulated. Modes driven by populations of energetic particles are observed, matching the TAE frequency seen with magnetic probes in JET experiments. A synthetic antenna, composed of one toroidal and two neighboring poloidal harmonics has been used to probe the modes' damping rates and quantify mechanisms for this damping in GTC simulations. This method was also applied to frequency and damping rate measurements of stable TAEs made by the Alfven eigenmode active diagnostic in these discharges.

Place, publisher, year, edition, pages
IOP PUBLISHING LTD , 2019. Vol. 59, no 2, article id 026008
Keywords [en]
energetic particle, Alfven wave, toroidal Alfven eigenmode
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:uu:diva-398675DOI: 10.1088/1741-4326/aaf430ISI: 000454238700002OAI: oai:DiVA.org:uu-398675DiVA, id: diva2:1376345
Note

For complete list of authors see http://dx.doi.org/10.1088/1741-4326/aaf430

Available from: 2019-12-09 Created: 2019-12-09 Last updated: 2019-12-09Bibliographically approved

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Andersson Sundén, ErikConroy, SeanEricsson, GöranEriksson, JacobHjalmarsson, AndersPossnert, GöranSjöstrand, HenrikWeiszflog, Matthias

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Andersson Sundén, ErikConroy, SeanEricsson, GöranEriksson, JacobHjalmarsson, AndersPossnert, GöranSjöstrand, HenrikWeiszflog, Matthias
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Applied Nuclear Physics
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Nuclear Fusion
Fusion, Plasma and Space Physics

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