Suppression of core turbulence by profile shaping in Wendelstein 7-X
Plasma Physics
2020-10-06 v1
Abstract
In the Wendelstein 7-X magnetic confinement experiment, a reduction of turbulent density fluctuations as well as anomalous impurity diffusion is associated with a peaking of the plasma density profile. These effects correlate with improved confinement and appear largely due to a reduction of anomalous transport as the change in neoclassical transport is small. The observed decrease of turbulent heat flux with increased density gradients is in agreement with nonlinear gyrokinetic simulations, and has been attributed to the unique geometry of W7-X that limits the severity of trapped electron modes.
Keywords
Cite
@article{arxiv.2010.02160,
title = {Suppression of core turbulence by profile shaping in Wendelstein 7-X},
author = {A. v. Stechow and O. Grulke and Th. Wegner and J. H. E. Proll and J. A. Alcusón and H. M. Smith and J. Baldzuhn and C. D. Beidler and M. N. A. Beurskens and S. A. Bozhenkov and E. Edlund and B. Geiger and Z. Huang and O. P. Ford and G. Fuchert and A. Langenberg and N. Pablant and E. Pasch and M. Porkolab and K. Rahbarnia and J. Schilling and E. R. Scott and H. Thomsen and L. Vanó and G. Weir and The W7-X Team},
journal= {arXiv preprint arXiv:2010.02160},
year = {2020}
}