Speaker
Javier Gonzalez-Martin
Description
See the full Abstract at http://ocs.ciemat.es/EPS2018ABS/pdf/P2.1059.pdf
Non-Linear 3D Hybrid Kinetic-MHD Simulations of Alfven Eigenmodes
in the ASDEX Upgrade Tokamak
J. Gonzalez-Martin1,3, M. Garcia-Munoz2,3, Y. Todo4, S. E. Sharapov5, M. Dunne6,
V. Igochine6, R. Fischer6, P. Oyola2, L. Sanchis-Sanchez1,3, A. Jacobsen6,
J. Ayllon-Guerola1,3, J. Galdon-Quiroga2,3, J. Rivero-Rodriguez1,3, J. Dominguez-Palacios2,
M. Rodriguez-Ramos2,3, J. Dominguez-Abascal1,3, AUG and MST1 Teams
1
Department of Mechanical Engineering and Manufacturing, University of Seville Spain.
2
Department of Atomic, Molecular and Nuclear Physics, University of Seville, Spain.
3
Centro Nacional de Aceleradores (CNA) (Universidad de Sevilla, CSIC, Junta de Andalucía).
4
National Institute for Fusion Science, Toki, Japan.
5
Culham Science Centre, Abingdon, UK.
6
Max-Planck-Institut für Plasmaphysik, Garching, Germany.
Recent experiments in the ASDEX Upgrade (AUG) tokamak have shown that externally
applied 3D fields may be used to control Toroidally Induced Alfven Eigenmodes (TAE) in
neutral beam heated discharges with elevated q-profile and low collisionality. TAEs have
been fully suppressed or excited in identical discharges with n=2 3D fields by varying their
poloidal spectrum. The non-linear 3D hybrid kinetic-MHD MEGA code has been applied to
these discharges to identify the underlying mechanism in a fully 3D geometry. MEGA
simulations reproduce some key aspects of the experiments such as the mode frequency,
radial structure and the dependence of the AE activity on the poloidal spectrum of the
externally applied 3D fields. The wave-particle resonances responsible for the TAE drive and
affected by the externally applied 3D fields have been identified using full orbit simulations.
A synthetic Fast-Ion Loss Detector (FILD) diagnostic has been included in MEGA by
implementing the AUG 3D wall for numerical particles.
