Nonlinear stabilization of tokamak microturbulence by fast ions
Plasma Physics
2015-06-16 v1
Abstract
Nonlinear electromagnetic stabilization by suprathermal pressure gradients found in specific regimes is shown to be a key factor in reducing tokamak microturbulence, augmenting significantly the thermal pressure electromagnetic stabilization. Based on nonlinear gyrokinetic simulations investigating a set of ion heat transport experiments on the JET tokamak, described by Mantica et al. [Phys. Rev. Lett. 107 135004 (2011)], this result explains the experimentally observed ion heat flux and stiffness reduction. These findings are expected to improve the extrapolation of advanced tokamak scenarios to reactor relevant regimes.
Cite
@article{arxiv.1306.6156,
title = {Nonlinear stabilization of tokamak microturbulence by fast ions},
author = {J. Citrin and C. Bourdelle and J. Garcia and J. W. Haverkort and G. M. D. Hogeweij and F. Jenko and T. Johnson and P. Mantica and M. J. Pueschel and D. Told and JET-EFDA contributors},
journal= {arXiv preprint arXiv:1306.6156},
year = {2015}
}
Comments
5 pages, 5 figures