An Enhanced Nonlinear Critical Gradient for Electron Turbulent Transport due to Reversed Magnetic Shear
Plasma Physics
2017-07-06 v1
Abstract
The first nonlinear gyrokinetic simulations of electron internal transport barriers (e-ITBs) in the National Spherical Torus Experiment show that reversed magnetic shear can suppress thermal transport by increasing the nonlinear critical gradient for electron-temperature-gradient-driven turbulence to three times its linear critical value. An interesting feature of this turbulence is nonlinearly driven off-midplane radial streamers. This work reinforces the experimental observation that magnetic shear is likely an effective way of triggering and sustaining e-ITBs in magnetic fusion devices.
Keywords
Cite
@article{arxiv.1105.2195,
title = {An Enhanced Nonlinear Critical Gradient for Electron Turbulent Transport due to Reversed Magnetic Shear},
author = {J. L. Peterson and G. W. Hammett and D. R. Mikkelsen and H. Y. Yuh and J. Candy and W. Guttenfelder and S. M. Kaye and B. LeBlanc},
journal= {arXiv preprint arXiv:1105.2195},
year = {2017}
}
Comments
4 pages, 5 figures