Author: Salomon Janhunen
Requested Type: Poster
Submitted: 2016-02-16 14:34:57
Co-authors: B. Wang, J. Hesthaven, E. d'Azevedo, S-H Ku, C-S Chang
Princeton Plasma Physics Lab
100 Stellarator road
Princeton, NEW JERSEY 08543-0
In this work we present development of a fully 3D mixed FEM/FDM electro-magnetic field solver for the gyrokinetic code XGC1. The system is formed through a quasi-orthogonal Kronecker product of the FEM and FDM bases, which yields a system for the solution of both scalar and vector potentials in low-frequency gyrokinetics. We present the numerical convergence characteristics of the discretization using manufactured solutions, three different numerical solver approaches for the solution of the system with highly parallel computational platforms, and evaluate the regime of validity for the current physics model.
We also discuss the importance of the perpendicular vector potential for the pressure driven modes.