Inelastic collisions facilitating runaway electron generation in weakly-ionized plasmas
Plasma Physics
2024-04-25 v2
Abstract
Dreicer generation is one of the main mechanisms of runaway electrons generation, in particular during tokamak startup. In fully ionized plasma it is described as a diffusive flow from the Maxwellian core into high energies under the effect of the electric field. In this work we demonstrate a critical role of the non-differential nature of inelastic collisions in weakly ionized plasma during tokamak startup, where some electrons experience virtually no collisions during acceleration to the critical energy. We show that using the Fokker-Planck collisional operator can underestimate the Dreicer generation rate by several orders of magnitude.
Keywords
Cite
@article{arxiv.2310.16268,
title = {Inelastic collisions facilitating runaway electron generation in weakly-ionized plasmas},
author = {Y. Lee and P. Aleynikov and P. C. de Vries and H. -T. Kim and J. Lee and M. Hoppe and J. -K. Park and G. J. Choi and J. Gwak and Y. -S. Na},
journal= {arXiv preprint arXiv:2310.16268},
year = {2024}
}