Suppression of turbulence by trapped electrons in optimised stellarators
Plasma Physics
2020-02-26 v1
Abstract
In fusion devices, the geometry of the confining magnetic field has a significant impact on the instabilities that drive turbulent heat loss. This is especially true of stellarators, where the "trapped electron mode" (TEM) is stabilised if specific optimisation criteria are satisfied, as in the Wendelstein 7-X experiment (W7-X). Here we find, by numerical simulation, that W7-X indeed has low TEM-driven transport, and also benefits from stabilisation of the ion-temperature-gradient mode, giving theoretical support for the existence of enhanced confinement regimes at finite density gradients.
Keywords
Cite
@article{arxiv.2002.10484,
title = {Suppression of turbulence by trapped electrons in optimised stellarators},
author = {J. H. E. Proll and P. Xanthopoulos and P. Helander and G. G. Plunk and B. J. Faber and T. Görler and H. M. Smith and M. J. Pueschel},
journal= {arXiv preprint arXiv:2002.10484},
year = {2020}
}