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Author Horton, W. ♦ Michoski, C. ♦ Peysson, Y. ♦ Decker, J.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ♦ DIFFRACTION ♦ ELECTRON CYCLOTRON-RESONANCE ♦ ELECTRON DENSITY ♦ ELECTRON TEMPERATURE ♦ ELECTRONS ♦ EMISSION SPECTRA ♦ FOKKER-PLANCK EQUATION ♦ GHZ RANGE ♦ H-MODE PLASMA CONFINEMENT ♦ ION TEMPERATURE ♦ LOWER HYBRID CURRENT DRIVE ♦ LOWER HYBRID HEATING ♦ PLASMA DENSITY ♦ STEADY-STATE CONDITIONS ♦ STOCHASTIC PROCESSES ♦ TEMPERATURE GRADIENTS ♦ TOKAMAK DEVICES ♦ TURBULENCE ♦ WAVE PROPAGATION ♦ X-RAY SPECTRA
Abstract Drift wave turbulence driven by the steep electron and ion temperature gradients in H-mode divertor tokamaks produce scattering of the RF waves used for heating and current drive. The X-ray emission spectra produced by the fast electrons require the turbulence broaden RF wave spectrum. Both the 5 GHz Lower Hybrid waves and the 170 GHz electron cyclotron [EC] RF waves experience scattering and diffraction by the electron density fluctuations. With strong LHCD there are bifurcations in the coupled turbulent transport dynamics giving improved steady-state confinement states. The stochastic scattering of the RF rays makes the prediction of the distribution of the rays and the associated particle heating a statistical problem. Thus, we introduce a Fokker-Planck equation for the probably density of the RF rays. The general frame work of the coupled system of coupled high frequency current driving rays with the low-frequency turbulent transport determines the profiles of the plasma density and temperatures.
ISSN 0094243X
Educational Use Research
Learning Resource Type Article
Publisher Date 2015-12-10
Publisher Place United States
Volume Number 1689
Issue Number 1


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