Toroidal turbulence simulations with gyro-Landau fluid models in a nonlinear ballooning mode representation

Conference · Sun May 01 04:00:00 EDT 1994 · AIP Conference Proceedings (American Institute of Physics); (United States)

OSTI ID:7032416

Waltz, R E ^[1]; Kerbel, G D ^[2]

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1. General Atomics, P. O. Box 85608, San Diego, California 92138-5608 (United States)
2. NERSC at Lawrence Livermore National Laboratory, Livermore California (United States)

The method of Hammett and Perkins [Phys. Rev. Lett. [bold 64], 3019 (1990)] to model Landau damping has been recently applied to the moments of the gyro-kinetic equation with curvature drift by Waltz, Dominguez, and Hammett [Phys. Fluids B [bold 4], 3138 (1992)]. The higher moments are truncated in terms of the lower moments (density, parallel velocity, and parallel and perpendicular pressure) by modeling the deviation from a perturbed Maxwellian to fit the kinetic response function at all values of the kinetic parameters: [ital k][sub [parallel]][ital v][sub [ital th]]/[omega], [ital b]=([ital k][sub [perpendicular]][rho])[sup 2]/2, and [omega][sub [ital D]]/[omega]. Here the resulting gyro-Landau fluid equations are applied to the simulation of ion temperature gradient (ITG) mode turbulence in toroidal geometry using a novel 3D nonlinear ballooning mode representation. The representation is a Fourier transform of the Cowley [ital et] [ital al]. [Phys. Fluids B [bold 3], 2767 (1991)] field line following twisted eddy basis ([ital k][sub [ital x][prime]],[ital k][sub [ital y][prime]],[ital z][prime]) with periodicity in toroidal and poloidal angles. Particular emphasis is given to the role of nonlinearly generated [ital n]=0 ([ital k][sub [ital y][prime]]=0, [ital k][sub [ital x][prime]][ne]0) radial modes'' in stabilizing the transport from the finite-[ital n] ITG ballooning modes.

• DOE Contract Number: FG03-92ER54150; W-7405-ENG-48
• OSTI ID: 7032416
• Report Number(s): CONF-9301107--
• Conference Information: Journal Name: AIP Conference Proceedings (American Institute of Physics); (United States) Journal Volume: 284:1
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700340* -- Plasma Waves
Oscillations
& Instabilities-- (1992-)
BALLOONING INSTABILITY
CLOSED PLASMA DEVICES
INSTABILITY
ION TEMPERATURE
NONLINEAR PROBLEMS
PLASMA INSTABILITY
PLASMA MACROINSTABILITIES
PLASMA SIMULATION
SIMULATION
TEMPERATURE GRADIENTS
THERMONUCLEAR DEVICES
THREE-DIMENSIONAL CALCULATIONS
TOKAMAK DEVICES
TURBULENCE