Gyrokinetic turbulent heating

Journal Article · Sun Oct 15 00:00:00 EDT 2006 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.2345179· OSTI ID:20860292

Hinton, F L; Waltz, R E ^[1]

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1. General Atomics, P.O. Box 85608, San Diego, California 92186-5608 (United States)

Expressions for particle and energy fluxes and heating rates due to turbulence are derived. These fluxes and heating rates are identified from moments of an extended drift-kinetic equation for the equilibrium distribution function. These include neoclassical as well as turbulent diffusion and heating. Phase-space conservation is demonstrated, allowing the drift-kinetic equation to be expressed in conservative form. This facilitates taking moments with few approximations, mainly those consistent with drift kinetics for the equilibrium distribution function and the relative smallness of the fluctuations. The turbulent heating is uniquely defined by choosing the standard gyrokinetic definition for the energy flux. With this definition, most of the heating can be expressed in the form of ohmic heating from turbulent parallel and perpendicular current density perturbations. The latter current is identified with grad-B and curvature drifts, plus terms involving magnetic perturbations (which are smaller for low beta). A small contribution to the heating comes from the divergence of an energy flux that is dependent on the finite gyroradius of the ions. The fluxes and heating rates are expressed in a form that can be easily evaluated from gyrokinetic turbulence simulations.

• OSTI ID: 20860292
• Journal Information: Physics of Plasmas, Vol. 13, Issue 10; Other Information: DOI: 10.1063/1.2345179; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
APPROXIMATIONS
CURRENT DENSITY
DISTRIBUTION FUNCTIONS
DISTURBANCES
ELECTRIC CURRENTS
EQUILIBRIUM
FLUCTUATIONS
HEATING RATE
IONS
KINETIC EQUATIONS
KINETICS
NEOCLASSICAL TRANSPORT THEORY
PHASE SPACE
PLASMA
PLASMA SIMULATION
RADIATION TRANSPORT
TURBULENCE
TURBULENT HEATING