Sub-microsecond temporal evolution of edge density during edge localized modes in KSTAR tokamak plasmas inferred from ion cyclotron emission

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 proton...

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Bibliographic Details
Published in:arXiv.org 2017-02
Main Authors: Chapman, B, Dendy, R O, McClements, K G, Chapman, S C, Yun, G S, Thatipamula, S G, Kim, M H
Format: Article
Language:English
Subjects:
Crashes
Cyclotron frequency
Cyclotrons
Density
Diagnostic systems
Emission
Ions
Plasma
Plasmas
Tokamak devices
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Summary: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.
ISSN:2331-8422
DOI:10.48550/arxiv.1702.01584