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22-27 October 2018
Mahatma Mandir Conference Centre
Asia/Kolkata timezone
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Self-consistent gyrokinetic description of the interaction between Alfven modes and turbulence

23 Oct 2018, 14:00
4h 45m
Mahatma Mandir Conference Centre

Mahatma Mandir Conference Centre

Gandhinagar (nearest Airport: Ahmedabad), India
Poster P2 Posters

Speaker

Dr Alessandro Biancalani (Max-Planck-Institut für Plasmaphysik)

Description

It is getting increasingly clear that many tokamak plasma phenomena which have traditionally been investigated separately, are actually intrinsically linked. One outstanding example along these lines - which is investigated in the present contribution - is the the interaction between Alfven modes (AM), turbulence, and zonal structures (ZS), like zonal flows and geodesic acoustic modes. Recently, a strong interest was raised in the fusion community by the possibility of generating ZS via nonlinear interaction with global modes like Alfven instabilities. In this work, the interaction of AM, turbulence and ZS is studied with the code ORB5. This model treats ions and electrons respectively as gyrokinetic and driftkinetic. ORB5 is a nonlinear global particle-in-cell code, developed for turbulence studies [1] and extended to its electromagnetic multi-species version [2] for the investigation of Alfven dynamics [3]. Recently, the importance of the kinetic electron effects in the ZS dynamics has also been emphasized with ORB5 [4]. ORB5 has also accomplished a verification/benchmark phase for AMs and has been used for the study of the nonlinear wave-particle interaction [5]. The competition between the different excitation mechanisms of ZS is the main focus of this work. When an EP population is added to the electromagnetic turbulence, the perturbed saturated field is observed to be modified by the presence of AMs. The effect of the different players are described separately, and in particular: wave-particle nonlinearity, wave-wave nonlinearity, effect of turbulence on AMs, effect of AMs on turbulence, for example via ZS generation, and bulk plasma omega-star effects on the AM growth rate and saturation. Comparisons with analytical theory and other models like the gyrokinetic Eulerian code GENE [6,7] are also done. [1] Jolliet S., et al. 2007, Comput. Phys. Comm. 177, 409 [2] Bottino A., et al. 2011, Plasma Phys. Controlled Fusion 53, 124027 [3] Biancalani A., et al. 2016, IAEA Fusion Energy Conference, Kyoto, Japan, TH/4-2 [4] Novikau I., et al. 2017, Phys. Plasmas 24, 122117 [5] Cole M. D. J., et al. 2017, Phys. Plasmas 24, 022508 [6] Jenko F. et al. 2000, Phys. Plasmas 7, 1904 [7] Goerler, T. et al. 2011, J. Comput. Phys. 230, 7053
Country or International Organization Germany
Paper Number TH/P2-9

Primary author

Dr Alessandro Biancalani (Max-Planck-Institut für Plasmaphysik)

Co-authors

Dr Alberto Bottino (Max-Planck-Institut für Plasmaphysik) Alessandro Di Siena (Max-Planck-Institut für Plasmaphysik) Emmanuel Lanti (EPFL-SPC, CH-1015 Lausanne, Switzerland) Prof. Frank Jenko (Max Planck Institute for Plasma Physics and University of Texas at Austin, Austin, TX 78712, USA) Dr Gabriele Merlo (University of Texas at Austin, Austin, TX 78712, USA) Ivan Novikau (Max-Planck-Institut für Plasmaphysik) Prof. Laurent Villard (EPFL-SPC, CH-1015 Lausanne, Switzerland) Noé Ohana (EPFL-SPC, CH-1015 Lausanne, Switzerland) Dr Oleksiy Mishchenko (Max-Planck-Institut für Plasmaphysik) Dr Ozgur Gurcan (LPP/Ecole Polytechnique/CNRS) Dr Pierre Morel (LPP/Ecole Polytechnique/CNRS) Dr Tobias Görler (Max Planck Institute for Plasma Physics) Dr Zhiyong Qiu (Zhejiang University)

Presentation Materials

Paper