Nonlinear global gyrokinetic delta-f turbulence simulations in a quasi-axisymmetric stellarator
- 17 April 2020
- journal article
- research article
- Published by AIP Publishing in Physics of Plasmas
- Vol. 27 (4), 044501
- https://doi.org/10.1063/1.5140232
Abstract
We use the global gyrokinetic stellarator code XGC-S to look at turbulence physics in geometry of the proposed quasi-axisymmetric stellarator, QUASAR. The XGC-S code is first verified for nonlinear simulations of ion temperature gradient-driven turbulence by a successful benchmark with the established nonlinear tokamak code XGC1 in a CYCLONE-like tokamak case. We then apply the XGC-S code to QUASAR for nonlinear turbulence physics. We find that the highly poloidally localized linear mode gives way to a more evenly distributed nonlinear turbulent structure. Meanwhile, the radial extent of the mode increases and occupies a large fraction of the volume, despite the initially localized temperature profile, as the profiles relax.Keywords
Funding Information
- Department of Energy (DEAC02- 09CH11466)
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