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Author Mikhailenko, V. V. ♦ Mikhailenko, V. S. ♦ Lee, Hae June
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PLASMA PHYSICS AND FUSION TECHNOLOGY ♦ DISTURBANCES ♦ ELECTRON TEMPERATURE ♦ ELECTRONS ♦ INSTABILITY ♦ INTEGRAL EQUATIONS ♦ INTEGRALS ♦ ION TEMPERATURE ♦ IONS ♦ LANDAU DAMPING ♦ MAGNETIC FIELDS ♦ NONLINEAR PROBLEMS ♦ PERTURBATION THEORY ♦ PLASMA ♦ RANDOMNESS ♦ SCATTERING ♦ SHEAR ♦ TEMPERATURE GRADIENTS ♦ THERMAL CONDUCTIVITY ♦ TRANSPORT THEORY ♦ TURBULENCE
Abstract The temporal evolution of the kinetic ion temperature gradient driven instability and of the related anomalous transport of the ion thermal energy of plasma shear flow across the magnetic field is investigated analytically. This instability develops in a steady plasma due to the inverse ion Landau damping and has the growth rate of the order of the frequency when the ion temperature is equal to or above the electron temperature. The investigation is performed employing the non-modal methodology of the shearing modes which are the waves that have a static spatial structure in the frame of the background flow. The solution of the governing linear integral equation for the perturbed potential displays that the instability experiences the non-modal temporal evolution in the shearing flow during which the unstable perturbation becomes very different from a canonical modal form. It transforms into the non-modal structure with vanishing frequency and growth rate with time. The obtained solution of the nonlinear integral equation, which accounts for the random scattering of the angle of the ion gyro-motion due to the interaction of ions with ensemble of shearing waves, reveals similar but accelerated process of the transformations of the perturbations into the zero frequency structures. It was obtained that in the shear flow the anomalous ion thermal conductivity decays with time. It is a strictly non-modal effect, which originates from the temporal evolution of the shearing modes turbulence.
ISSN 1070664X
Educational Use Research
Learning Resource Type Article
Publisher Date 2016-06-15
Publisher Place United States
Journal Physics of Plasmas
Volume Number 23
Issue Number 6


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