Göttingen 2025 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
P: Fachverband Plasmaphysik
P 10: Poster Session I
P 10.25: Poster
Dienstag, 1. April 2025, 16:15–18:15, ZHG Foyer 1. OG
3D full-wave simulation of the O-SX mode conversion process — •Alf Köhn-Seemann1, Bengt Eliasson2, Simon Freethy3, Roddy Vann4, and Thomas Wilson3,4 — 1IGVP, University of Stuttgart, Germany — 2SUPA, Department of Physics, University of Strathclyde, Glasgow, U.K. — 3Culham Centre of Fusion Energy, Culham, U.K. — 4York Plasma Institute, University of York, U.K.
Electron Bernstein waves (EBWs) provide a method to heat over-dense plasmas, whose electron plasma density exceeds the cut-off density of an injected electromagnetic wave. EBWs are very well absorbed at the electron cyclotron resonance frequency and its harmonics, even for low electron temperatures. They can furthermore drive significant toroidal net currents. This makes them particularly interesting for spherical tokamaks which often have only a small or no central solenoid and rely therefore on non-inductive current drive. EBWs are electrostatic waves, requiring them to be coupled to externally injected electromagnetic waves. Here we present 3D numerical simulations of the coupling process with the novel finite-difference time-domain code FOCAL. Simulation results from a feasibility study for the spherical tokamak MAST Upgrade are presented and related numerical challenges are discussed.
Keywords: plasma waves; simulation; modeling; FDTD