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6 papers
Effects of plasma turbulence on the nonlinear evolution of magnetic island in tokamak
Minjun J. Choi, Laszlo Bardoczi, Jae-Min Kwon +7
Magnetic islands (MIs), resulting from a magnetic field reconnection, are ubiquitous structures in magnetized plasmas. In tokamak plasmas, recent researches suggested that the inte…
Semi-analytic Shape Function of High-harmonic Electron Cyclotron Emission in Tenuous Plasma
J. Leem, J. Jo, G. S. Yun
Semi-analytic expressions for the electron cyclotron emission (ECE) shape function are developed for arbitrary high harmonics. The integrand of the harmonic ECE…
Experimental evidence of the non-diffusive avalanche-like electron heat transport events and their dynamical interaction with the shear flow structure
Minjun J. Choi, Hogun Jhang, J. -M. Kwon +12
We present experimental observations suggesting that the non-diffusive avalanche-like events are a prevalent and universal process of the electron turbulent heat transport in tokam…
Distinct stages of radio frequency emission at the onset of pedestal collapse in KSTAR H-mode plasmas
Minho Kim, Shekar G. Thatipamula, Jieun Lee +4
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 a…
Mathematical analysis of long-time behavior of magnetized fluid instabilities with shear flow
Youngmin Oh, Gunsu S. Yun, Hyung Ju Hwang
We study a complex Ginzburg-Landau (GL) type model related to fluid instabilities in the boundary of magnetized toroidal plasmas (called edge-localized modes) with a prescribed she…
Dynamic and Stagnating Plasma Flow Leading to Magnetic Flux Tube Collimation
Setthivoine You, Paul M. Bellan, Gunsu Yun
Highly collimated, plasma-filled magnetic flux tubes are frequently observed on galactic, stellar and laboratory scales. We propose that a single, universal magnetohydrodynamic pum…