Erlangen 2018 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 7: Magnetic Confinement I - Helmholtz Graduate School III

P 7.1: Hauptvortrag

Dienstag, 6. März 2018, 10:30–11:00, A 0.112

Plasma Edge Physics with 3D Magnetic Boundaries - an Overview — •Oliver Schmitz — U of Wisconsin - Madison, USA

High temperature plasmas are confined in doughnut-shaped magnetic field cages to reach conditions which can ultimately allow production of energy by nuclear fusion. The plasma transport in the plasma boundary is governed by the parallel transport along open field lines onto material surfaces. These parallel particle and energy fluxes are sourced by particle and energy transport perpendicular to the magnetic field from the plasma core domain. This basic picture is complicated when three-dimensional (3D) magnetic structures are at play. Then, the topology of these parallel transport flux tubes is complex, sometimes chaotic, and the plasma transport is accompanied by magnetic diffusion and cross-talk between the magnetic flux channels.

In this talk, key aspects of the plasma edge transport and of the plasma material interaction in such 3D plasma boundaries are presented and discussed, based on recent selected experimental findings and accompanying modeling results from a 3D plasma fluid and kinetic neutral transport code - the EMC3-EIRENE model. The 3D aspects discussed are important in tokamak devices, where magnetic perturbation fields are applied to fine tune plasma transport and stability in the plasma edge. Also, they are inherent to stellarator devices, which feature an intrinsically highly 3D plasma boundary defining much of the system state as a possible future energy source.
Acknowledgement: Work funded by the U.S. Department of Energy under grants DE-SC0013911, DE-SC0014210 and DE-SC0012315.