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

Abstract

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, 4768 magnetic resonances were detected with up to fourteen fast magnetic probes. In this work, we present the calculations of resonant frequencies f0, damping rates \gamma < 0, and toroidal mode numbers n, spanning the parameter range f0 = 30 - 250 kHz, -\gamma = 0 - 13 kHz, and |n| < 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 presencemore » of alpha particles during the upcoming DT campaign, thereby extrapolating with confidence to future tokamaks.« less

Authors:
; ; ; ; ; ; ;
Publication Date:
DOE Contract Number:  
FG02-99ER54563; AC05-00OR22725; AC02-05CH11231
Research Org.:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES)
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
OSTI Identifier:
1886639
DOI:
https://doi.org/10.7910/DVN/1G4V7P

Citation Formats

Tinguely, R. A., Puglia, P. G., Fil, N., Dowson, S., Porkolab, M., Fasoli, A., Testa, D., and JET Contributors. Results from the Alfven Eigenmode Active Diagnostic during the 2019-2020 JET deuterium campaign. United States: N. p., 2021. Web. doi:10.7910/DVN/1G4V7P.
Tinguely, R. A., Puglia, P. G., Fil, N., Dowson, S., Porkolab, M., Fasoli, A., Testa, D., & JET Contributors. Results from the Alfven Eigenmode Active Diagnostic during the 2019-2020 JET deuterium campaign. United States. doi:https://doi.org/10.7910/DVN/1G4V7P
Tinguely, R. A., Puglia, P. G., Fil, N., Dowson, S., Porkolab, M., Fasoli, A., Testa, D., and JET Contributors. 2021. "Results from the Alfven Eigenmode Active Diagnostic during the 2019-2020 JET deuterium campaign". United States. doi:https://doi.org/10.7910/DVN/1G4V7P. https://www.osti.gov/servlets/purl/1886639. Pub date:Fri Jun 25 00:00:00 EDT 2021
@article{osti_1886639,
title = {Results from the Alfven Eigenmode Active Diagnostic during the 2019-2020 JET deuterium campaign},
author = {Tinguely, R. A. and Puglia, P. G. and Fil, N. and Dowson, S. and Porkolab, M. and Fasoli, A. and Testa, D. and JET Contributors},
abstractNote = {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, 4768 magnetic resonances were detected with up to fourteen fast magnetic probes. In this work, we present the calculations of resonant frequencies f0, damping rates \gamma < 0, and toroidal mode numbers n, spanning the parameter range f0 = 30 - 250 kHz, -\gamma = 0 - 13 kHz, and |n| < 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.},
doi = {10.7910/DVN/1G4V7P},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2021},
month = {6}
}

Works referencing / citing this record:

Results from the Alfvén Eigenmode Active Diagnostic during the 2019-2020 JET deuterium campaign
journal, September 2020