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• W2039239276 endingPage "083014" @default.
• W2039239276 startingPage "083014" @default.
• W2039239276 abstract "The goals of this paper are to compare the results of electron particle transport measurements in ohmic (OH) plasmas by means of a small perturbation technique, high-level gas puff and gas switch off, investigate the phenomenon of 'density pump out' during electron cyclotron resonance heating (ECRH) and to correlate density behaviour with turbulence. Two approaches for plasma particle transport studies were compared: the low perturbation technique of periodic puff (δn/ne = 0.3%) and strong density variations (δn/ne < 50%), including density ramp-up by gas puff and ramp-down with gas switch off. The model with constant in time diffusion coefficients and pinch velocities could describe the core density perturbations but failed at the edge. In the case of strong puff three stages were distinguished. Degraded energy confinement and, respectively, low turbulence frequencies were observed during density ramp-up and ramp-down, while enhanced confinement and higher turbulence frequencies were typical for the intermediate stage. Density profile variation during this intermediate phase could be described in the framework of the transport model with constant in time coefficients. The application of ECRH at the density ramp-up phase provided the possibility of postponing the 'density pump out'. The increase in the low-frequency modes in turbulence spectra was observed at the 'density pump out' phase during central ECRH. Although the high- and low-frequency bands of turbulence spectra behaved as trapped electron mode and ion temperature gradient, respectively, they both rotated at the same angular velocity as a rigid body together with magnetohydrodynamic mode m/n = 2/1 and [E × B] plasma rotation." @default.
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• W2039239276 date "2013-07-10" @default.
• W2039239276 modified "2023-09-27" @default.
• W2039239276 title "Electron particle transport and turbulence studies in the T-10 tokamak" @default.
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• W2039239276 doi "https://doi.org/10.1088/0029-5515/53/8/083014" @default.
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