NORSE: A solver for the relativistic non-linear Fokker-Planck equation for electrons in a homogeneous plasma
arXiv:1608.02742 · doi:10.1016/j.cpc.2016.10.024
Abstract
Energetic electrons are of interest in many types of plasmas, however previous modeling of their properties has been restricted to the use of linear Fokker-Planck collision operators or non-relativistic formulations. Here, we describe a fully non-linear kinetic-equation solver, capable of handling large electric-field strengths (compared to the Dreicer field) and relativistic temperatures. This tool allows modeling of the momentum-space dynamics of the electrons in cases where strong departures from Maxwellian distributions may arise. As an example, we consider electron runaway in magnetic-confinement fusion plasmas and describe a transition to electron slide-away at field strengths significantly lower than previously predicted.
arXiv comment18 pages, 5 figures
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- A fully implicit, scalable, conservative nonlinear relativistic Fokker-Planck 0D-2P solver for runaway electron
- Runaway electron modelling in the self-consistent core European Transport Simulator, ETS
- Validity of models for Dreicer generation of runaway electrons in dynamic scenarios
- An asymptotic-preserving 2D-2P relativistic Drift-Kinetic-Equation solver for runaway electron simulations in axisymmetric tokamaks