Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Distinct stages of radio frequency emission at the onset of pedestal
  collapse in KSTAR H-mode plasmas   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 the pedestal collapse in high confinement
discharges. Comparison with 2-D electron cyclotron emission (ECE) images has
revealed that each stage is related to the instantaneous condition at the
outboard mid-plane edge. First, high-harmonic ion cyclotron emissions (ICE) are
intensified with the appearance of a non-modal filamentary perturbation in the
edge within several tens of microseconds before the collapse. Then, the RF
emission becomes broad toward high-frequency range (< 500 MHz) at the burst
onset of the non-modal filament. During the pedestal collapse initiated by the
filament burst, rapid chirping (1-3 {\mu}s) appear with additional filament
bursts. The strong correlation between the RF spectra and the perturbation
structure provides important clues on the stability of edge-localized modes and
on the ion dynamics in the plasma boundary.

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The categories of this paper are: stat
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The categories of this paper are: chem-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: alg-geom
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The categories of this paper are: math-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: nucl-th
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The categories of this paper are: cond-mat
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The categories of this paper are: supr-con
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The categories of this paper are: adap-org
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The categories of this paper are: eess
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The categories of this paper are: dg-ga
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The categories of this paper are: funct-an
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The categories of this paper are: ao-sci
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The categories of this paper are: quant-ph
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The categories of this paper are: cmp-lg