Calculating RF current condensation with self-consistent ray-tracing
Abstract
By exploiting the nonlinear amplification of the power deposition of RF waves, current condensation promises new pathways to the stabilisation of magnetic islands. We present a numerical analysis of current condensation, coupling a geometrical optics treatment of wave propagation and damping to a thermal diffusion equation solver in the island. Taking into account the island geometry and relativistic damping, previous analytical theory can be made more precise and specific scenarios can be realistically predicted. With this more precise description, bifurcations and associated hysteresis effects could be obtained in an ITER-like scenario at realistic parameter values. Moreover, it is shown that dynamically varying the RF wave launching angles can lead to hysteresis and help to avoid the nonlinear shadowing effect.
Keywords
Cite
@article{arxiv.2005.05997,
title = {Calculating RF current condensation with self-consistent ray-tracing},
author = {Richard Nies and Allan H. Reiman and Eduardo Rodriguez and Nicola Bertelli and Nathaniel J. Fisch},
journal= {arXiv preprint arXiv:2005.05997},
year = {2020}
}
Comments
13 pages, 8 figures