Section:
New Results
TARGET
Participants :
Nicolas Bouzat, Guillaume Latu, Camilla Bressan, Michel Mehrenberger, Virginie Grandgirard.
TArgeting Realistic GEometry in Tokamak code gysela
The framework of the work in [16] is the Semi-Lagrangian setting for solving the
gyrokinetic Vlasov equation and the Gysela code. A new variant for the
interpolation method is proposed that can handle the mesh singularity in the poloidal plane
at (a polar system is used for the moment in Gysela). A non-uniform meshing of the
poloidal plane is proposed, instead of a uniform one, in order to save memory and computations.
The interpolation method, the gyroaverage operator, and the Poisson solver are revised in
order to cope with non-uniform meshes. A mapping that establishes a bijection from polar
coordinates to more realistic plasma shapes is used to improve the realism. Convergence studies
are provided to establish the validity and robustness of our new approach.
This work has been initiated at CEMRACS 2016.
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