Distinct stages of radio frequency emission at the onset of pedestal collapse in KSTAR H-mode plasmas
作者： M.H. Kim , S.G. Thatipamula , J.E. Lee , M.J. Choi , H.K. Park
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摘要: Using a high-speed and broadband radio frequency (RF) (0.1–1 GHz) spectrum analyzer developed on the KSTAR tokamak, it is found that several distinct stages of RF emission appear at pedestal collapse in high confinement discharges. Comparison with 2D electron cyclotron (ECE) images has revealed each stage related to instantaneous condition outboard mid-plane edge. First, high-harmonic ion emissions (ICE) are intensified appearance non-modal filamentary perturbation edge within tens microseconds before collapse. Then, becomes broad toward high-frequency range (<500 MHz) burst onset filament. During initiated by filament burst, rapid chirping (1–3 μs) additional bursts. The strong correlation between spectra structure provides important clues stability edge-localized modes dynamics plasma boundary.
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