Artículo
Modelling of Energetic Particle Drive and Damping Effects on TAEs in AUG Experiment with ECCD
Autor/es | Calado, R.
Nabais, F. Sharapov, S. E. Schneider, P. Kazakov, Ye. García Muñoz, Manuel Snicker, A. Ferreira, J. Coelho, R. Dreval, M. Fuertes, J. Galdon Quiroga, J. Gonzalez Martin, Javier Karpushov, A. Stober, J. Tardini, G. Van Zeeland, M. A. |
Director | |
Departamento | Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear Universidad de Sevilla. Departamento de Ingeniería Mecánica y de Fabricación |
Fecha de publicación | 2024 |
Fecha de depósito | 2024-05-14 |
Publicado en |
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Resumen | The impact of electron cyclotron current drive (ECCD)-driven current on toroidicity-induced Alfvén eigenmodes (TAEs) in experiments on the AUG tokamak is investigated numerically. The dynamical evolution of the plasma ... The impact of electron cyclotron current drive (ECCD)-driven current on toroidicity-induced Alfvén 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. |
Agencias financiadoras | European Union (UE) Fundação para a Ciência e a Tecnologia. Portugal |
Identificador del proyecto | 101052200
PD/BD/142967/2018 PD/00505/2012 UIDB/04561/2020 UIDB/50010/2020 UIDP/50010/2020 |
Cita | Calado, R., Nabais, F., Sharapov, S.E., Schneider, P., Kazakov, Y., García Muñoz, M.,...,Van Zeeland, M.A. (2024). Modelling of Energetic Particle Drive and Damping Effects on TAEs in AUG Experiment with ECCD. Nuclear Fusion, 64 (1), 016039. https://doi.org/10.1088/1741-4326/ac207f. |
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