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research article

Results from the Alfven Eigenmode Active Diagnostic during the 2019-2020 JET deuterium campaign

Tinguely, R. A.
•
Puglia, P.  
•
Fil, N.
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November 1, 2020
Plasma Physics And Controlled Fusion

This paper presents results of extensive analysis of mode excitation observed during the operation of the Alfven Eigenmode Active Diagnostic (AEAD) in the JET tokamak during the 2019-2020 deuterium campaign. Six of eight toroidally spaced antennas, each with independent power and phasing, were successful in actively exciting stable MHD modes in 479 plasmas. In total, magnetic resonances were detected with up to fourteen fast magnetic probes. In this work, we present the calculations of resonant frequencies f(0), damping rates gamma < 0, and toroidal mode numbers n, spanning the parameter ranges f(0) approximate to 30-250 kHz, -gamma approximate to 0-13 kHz, and vertical bar n vertical bar <= 30. In general, good agreement is seen between the resonant and the calculated toroidal Alfven Eigenmode frequencies, and between the toroidal mode numbers applied by the AEAD and estimated of the excited resonances. We note several trends in the database: the probability of resonance detection decreases with plasma current and external heating power; the normalized damping rate increases with edge safety factor but decreases with external heating. These results provide key information to prepare future experimental campaigns and to better understand the physics of excitation and damping of Alfven Eigenmodes in the presence of alpha particles during the upcoming DT campaign, thereby extrapolating with confidence to future tokamaks.

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Type
research article
DOI
10.1088/1361-6587/aba7f7
Web of Science ID

WOS:000570316300001

Author(s)
Tinguely, R. A.
Puglia, P.  
Fil, N.
Dowson, S.
Porkolab, M.
Fasoli, A.  
Testa, D.  
Contributors, J. E. T.
Date Issued

2020-11-01

Published in
Plasma Physics And Controlled Fusion
Volume

62

Issue

11

Article Number

115002

Subjects

Physics, Fluids & Plasmas

•

Physics

•

alfven eigenmodes

•

stability

•

damping rate

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toroidal mode number

•

fast magnetics

•

tokamak

•

wave

•

instabilities

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
SPC  
SHS-ENS  
Available on Infoscience
October 2, 2020
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/172149
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