Plasma Physics seminars

Runaway electrons can severely damage plasma-facing components in current and future tokamaks. This webinar presents a research roadmap connecting runaway-electron models with plasma–surface interactions and material-damage calculations. It examines the physics, experiments, model integration and validation needed to predict electron loads and damage at reactor walls. The speakers assess current capabilities, gaps in modeling chains, and challenges for ITER and subsequent fusion devices.

Ruchi Mishra compares magnetized accretion onto charged black holes and horizonless compact objects using ongoing three-dimensional general-relativistic magnetohydrodynamic simulations. In a Reissner–Nordström spacetime whose charge exceeds its mass, a naked singularity replaces the event horizon, with a repulsive region, a zero-gravity radius, and a different structure of circular orbits. Earlier equilibrium calculations found toroidal rotating-fluid configurations around such singularities. Building on that work, the simulations examine how charge changes the accumulation of matter, transport of angular momentum, and organization of magnetic fields.