Speaker
Laurent Chôné
Description
See the full Abstract at http://ocs.ciemat.es/EPS2018ABS/pdf/P2.1029.pdf
Gyrokinetic simulation of turbulence at the FT-2 tokamak egde
L. Chôné1, A. D. Gurchenko2, E. Z. Gusakov2, T. P. Kiviniemi1, S. I. Lashkul2, S. Leerink1,
P. Niskala1
1
Department of Applied Physics, Aalto University, Espoo, Finland
2
Ioffe Institute, St. Petersburg, Russia
Predicting the dynamics of edge plasma is of particular importance for magnetic fusion
devices. Indeed, the scrape-off layer (SOL) dynamics governs the power exhaust and
plasma-surface interaction, which entails that it controls the influx of impurities, as well as
the transition to improved confinement regimes via the formation of edge transport barriers
(ETB) [1-5]. Because of the non-linear nature of the edge and SOL plasma dynamics,
predictions have to rely on numerical simulations from first principle.
In this work, we use the global full-f particle-in-cell (PIC) gyrokinetic code ELMFIRE [6] to
simulate circular limited tokamak plasmas from the magnetic axis to the SOL, including a
simple PWI model. In order to simulate the FT-2 SOL, ELMFIRE uses the logical boundary
condition to faithfully reproduce recover the sheath-limited SOL [7]. Here we characterise
the dynamics of turbulence in the SOL of FT-2 and it’s interaction with the confined plasma
across the last-closed flux surface (LCFS).
[1] E. J. Doyle et al., Nucl. Fusion 47 (2007) S18
[2] A. Loarte et al., Nucl. Fusion 47 (2007) S203
[3] P. C. Stangeby, The Plasma Boundary of Magnetic Fusion Devices, IOP, 2000
[4] F. Wagner, Plasma Phys. Control. Fusion 49 (2007) B1
[5] F. Ryter et al., Nucl. Fusion 54 (2014) 083003
[6] J. A. Heikkinen et al., J. Comput. Phys. 227 (2008) 5582‒5609
[7] L. Chôné et al., Contrib. Plasma Phys. to be published
