IFS Seminar

Abstract: Magnetic disruptions and burning plasmas are two critical

problems of the fusion program involving high energy particles. In the

case of disruptions, relativistic runaway electrons (RE) can seriously

damage the plasma facing components. On the other hand, to sus-

tain a burning plasma, energetic particles (EP), generated via external

heating as well as fusion-born alpha particles, need to be confined to

transfer their energy to the thermal population. In this presentation

we discuss recent progress in RE and EP. In the case of RE, topics

include modeling and simulation of generation, mitigation, and assess-

ment of wall damage. In the case of EP topics include the confinement

and anomalous transport of ions and alpha particles in the presence

of EGAMS, tearing modes, fishbones, and Alfv´en modes. To address

these problems two codes have been developed: KORC (Kinetic Or-

bit Runaway electron Code) and TAPaS (Toroidal Accelerated Par-

ticle Simulator). A brief description of these codes will be presented

along with a discussion of novel theoretical tools including Feynman-

Kac based probabilistic methods and normalizing flow machine learning

algorithms.