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TAE stability calculations compared to TAE antenna results in JET
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
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Number of Authors: 12372018 (English)In: Nuclear Fusion, ISSN 0029-5515, E-ISSN 1741-4326, Vol. 58, no 8, article id 082007Article in journal (Refereed) Published
Abstract [en]

The excitation of modes in the toroidal Alfven eigenmodes (TAE) gap by an external antenna can be modelled by a driven damped harmonic oscillator. By performing a frequency scan it is possible to determine the damping rate of the mode through the quality factor. This method has been employed in recent Joint European Torus (JET) experiments dedicated to scenario development for the observation of alpha-driven instabilities in JET DT plasmas (i.e. plasmas composed by Deuterium and Tritium). However, the toroidal mode number n of the mode for which the measurements were performed could not be determined experimentally. The value of the damping obtained through experimental measurements for a selected time slice is then compared with those obtained from calculations performed by numerical codes for different modes with frequencies close to the experimental frequency of the antenna. This paper describes the modelling method and presents the numerical simulations carried out using a suite of codes to calculate the damping of TAE, which are compared with the value measured experimentally. The radial structures of these modes are first calculated with the ideal magnetohydrodynamic (MHD) code MISHKA. For each of these modes, the damping on thermal ions and thermal electrons and the contribution to the mode growth rate resulting from the resonant interaction with the ion cyclotron resonance heating (ICRH) accelerated ion population are calculated using the drift-kinetic code CASTOR-K. The radiative damping is calculated by using a complex resistivity in the resistive MHD code CASTOR code and the continuum damping is estimated using also the CASTOR code through the standard method of making the real part of the resistivity tend to zero. It was found the radiative damping is largely dominant over all other effects, except for the n = 3 TAE. The overall damping calculated numerically is consistent with the damping measured experimentally.

Place, publisher, year, edition, pages
IOP PUBLISHING LTD , 2018. Vol. 58, no 8, article id 082007
Keywords [en]
tokamaks, TAE antenna, Alfven eigemodes, energetic particles
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:uu:diva-398267DOI: 10.1088/1741-4326/aabdbdISI: 000436930000004OAI: oai:DiVA.org:uu-398267DiVA, id: diva2:1375660
Note

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

Available from: 2019-12-05 Created: 2019-12-05 Last updated: 2019-12-05Bibliographically approved

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Andersson Sundén, ErikCecconello, MarcoConroy, SeanEricsson, GöranEriksson, JacobHjalmarsson, AndersPossnert, GöranSjöstrand, HenrikWeiszflog, Matthias

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Andersson Sundén, ErikCecconello, MarcoConroy, SeanEricsson, GöranEriksson, JacobHjalmarsson, AndersPossnert, GöranSjöstrand, HenrikWeiszflog, Matthias
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Applied Nuclear PhysicsHigh Energy Physics
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