Sub-microsecond temporal evolution of edge density during edge localized modes in KSTAR tokamak plasmas inferred from ion cyclotron emission
Plasma Physics
2017-11-22 v1
Abstract
Ion cyclotron emission (ICE) is detected during edge localised modes (ELMs) in the KSTAR tokamak at harmonics of the proton cyclotron frequency in the outer plasma edge. The emission typically chirps downward (occasionally upward) during ELM crashes, and is driven by confined 3MeV fusion-born protons that have large drift excursions from the plasma core. We exploit fully kinetic simulations at multiple plasma densities to match the time-evolving features of the chirping ICE. This yields a unique, very high time resolution diagnostic of the collapsing edge pedestal density.
Keywords
Cite
@article{arxiv.1702.01584,
title = {Sub-microsecond temporal evolution of edge density during edge localized modes in KSTAR tokamak plasmas inferred from ion cyclotron emission},
author = {B. Chapman and R. O. Dendy and K. G. McClements and S. C. Chapman and G. S. Yun and S. G. Thatipamula and M. H. Kim},
journal= {arXiv preprint arXiv:1702.01584},
year = {2017}
}
Comments
5 pages, 7 figures. Submitted for publication to Physical Review Letters