Effect of turbulence on electron cyclotron current drive and heating in ITER
Abstract
Non-linear local electromagnetic gyrokinetic turbulence simulations of the ITER standard scenario H-mode are presented for the q=3/2 and q=2 surfaces. The turbulent transport is examined in regions of velocity space characteristic of electrons heated by electron cyclotron waves. Electromagnetic fluctuations and sub-dominant micro-tearing modes are found to contribute significantly to the transport of the accelerated electrons, even though they have only a small impact on the transport of the bulk species. The particle diffusivity for resonant passing electrons is found to be less than 0.15 m^2/s, and their heat conductivity is found to be less than 2 m^2/s. Implications for the broadening of the current drive and energy deposition in ITER are discussed.
Keywords
Cite
@article{arxiv.1407.7767,
title = {Effect of turbulence on electron cyclotron current drive and heating in ITER},
author = {F. J. Casson and E. Poli and C. Angioni and R. Buchholz and A. G. Peeters},
journal= {arXiv preprint arXiv:1407.7767},
year = {2015}
}
Comments
Letter, 5 pages, 5 figures, for submission to Nuclear Fusion