Quasi-linear analysis of the extraordinary electron wave destabilized by runaway electrons
Abstract
Runaway electrons with strongly anisotropic distributions present in post-disruption tokamak plasmas can destabilize the extraordinary electron (EXEL) wave. The present work investigates the dynamics of the quasi-linear evolution of the EXEL instability for a range of different plasma parameters using a model runaway distribution function valid for highly relativistic runaway electron beams produced primarily by the avalanche process. Simulations show a rapid pitch-angle scattering of the runaway electrons in the high energy tail on the time scale. Due to the wave-particle interaction, a modification to the synchrotron radiation spectrum emitted by the runaway electron population is foreseen, exposing a possible experimental detection method for such an interaction.
Keywords
Cite
@article{arxiv.1407.5788,
title = {Quasi-linear analysis of the extraordinary electron wave destabilized by runaway electrons},
author = {G. I. Pokol and A. Kómár and A. Budai and A. Stahl and T. Fülöp},
journal= {arXiv preprint arXiv:1407.5788},
year = {2015}
}