Bi-directional Alfv\'en Cyclotron Instabilities in the Mega-Amp Spherical Tokamak
Plasma Physics
2015-10-29 v1
Abstract
Alfv\'en cyclotron instabilities excited by velocity gradients of energetic beam ions were investigated in MAST experiments with super-Alfv\'enic NBI over a wide range of toroidal magnetic fields from ~0.34 T to ~0.585 T. In MAST discharges with high magnetic field, a discrete spectrum of modes in the sub-cyclotron frequency range is excited toroidally propagating counter to the beam and plasma current (toroidal mode numbers n < 0).
Keywords
Cite
@article{arxiv.1404.6374,
title = {Bi-directional Alfv\'en Cyclotron Instabilities in the Mega-Amp Spherical Tokamak},
author = {S. E. Sharapov and M. K. Lilley and R. Akers and N. Ben Ayed and M. Cecconello and J. W. C. Cook and G. Cunningham and E. Verwichte and the MAST Tea},
journal= {arXiv preprint arXiv:1404.6374},
year = {2015}
}
Comments
28 pages, 13 figures. This article has been submitted to Physics of Plasmas. After it is published, it will be found at http://scitation.aip.org/content/aip/journal/pop/browse