@article{1d91c4dc75fe4f38b543ef9849801df9,
title = "Modelling of energetic particle drive and damping effects on TAEs in AUG experiment with ECCD",
abstract = "The impact of electron cyclotron current drive (ECCD)-driven current on toroidicity-induced Alfv{\'e}n eigenmodes (TAEs) in experiments on the AUG tokamak is investigated numerically. The dynamical evolution of the plasma profiles and equilibria are modelled with European transport solver, while ion cyclotron resonance heating-accelerated H-minority ions exciting TAEs are assessed with the PION code. TAEs, their drive and damping are computed with the codes CASTOR and CASTOR-K. In the set of discharges analysed, two groups of TAEs are observed, differing in frequency and radial location. Experimental observations show that when counter-ECCD is applied the higher frequency group of approximately 150 kHz is suppressed, while the lower frequency modes of 125 kHz are amplified. When co-ECCD is applied, depending on the location of the ECCD current deposition layer, both groups of TAE can be suppressed. Numerical calculations of energetic particle drive and thermal plasma damping show that neither one effect could explain the variety of the experimental observations. The fine balance between the drive, sensitive to the TAE position, and the radiative and continuum damping effects could only explain the experiment if the effects are considered all together.",
keywords = "Alfv{\'e}n eigenmodes, ECCD, energetic ions, tokamaks",
author = "R. Calado and F. Nabais and Sharapov, {S. E.} and P. Schneider and Ye Kazakov and M. Garcia-Mu{\~n}oz and A. Snicker and J. Ferreira and R. Coelho and M. Dreval and J. Fuertes and J. Galdon-Quiroga and J. Gonzalez-Martin and A. Karpushov and J. Stober and G. Tardini and {Van Zeeland}, {M. A.} and {ASDEX Upgrade Team}",
note = "Funding Information: This work has been carried out within the framework of the EUROfusion Consortium, funded by the European Union via the Euratom Research and Training Programme (Grant Agreement No. 101052200—EUROfusion). Views and opinions expressed are however those of the author(s) only and do not necessarily reflect those of the European Union or the European Commission. Neither the European Union nor the European Commission can be held responsible for them. The work of R Calado has been funded by the Funda{\c c}{\~a}o para a Ci{\^e}ncia e a Tecnologia (FCT, Lisboa) under Grant No. PD/BD/142967/2018 and carried out as part of his training in the framework of the Advanced Program in Plasma Science and Engineering (APPLAuSE, sponsored by FCT under Grant No. PD/00505/2012) at Instituto Superior T{\'e}cnico (IST). This work has also been funded by FCT under Project No. UIDB/04561/2020. IST activities also received financial support from Funda{\c c}{\~a}o para a Ci{\^e}ncia e Tecnologia through Projects UIDB/50010/2020 and UIDP/50010/2020. The views and opinions expressed herein do not necessarily reflect those of FCT, of IST, or of their services. Publisher Copyright: {\textcopyright} 2023 The Author(s). Published by IOP Publishing Ltd on behalf of the IAEA. All rights reserved.",
year = "2023",
month = dec,
day = "12",
doi = "10.1088/1741-4326/ad0d33",
language = "English",
volume = "64",
pages = "1--12",
journal = "Nuclear Fusion",
issn = "0029-5515",
publisher = "Institute of Physics Publishing ",
number = "1",
}