Toroidal gyro-Landau fluid model turbulence simulations in a nonlinear ballooning mode representation with radial modes

Journal Article · Fri Jul 01 00:00:00 EDT 1994 · Physics of Plasmas; (United States)

DOI:https://doi.org/10.1063/1.870934· OSTI ID:7112122

Waltz, R E ^[1]; Kerbel, G D; Milovich, J ^[2]

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1. General Atomics, P.O. Box 85608, San Diego, California 92186-9784 (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 gyrokinetic 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 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 three-dimensional (3-D) nonlinear ballooning mode representation. The representation is a Fourier transform of a field line following basis ([ital k][sub [ital y]][sup [prime]],[ital k][sub [ital x]][sup [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]][sup [prime]] = 0, [ital k][sub [ital x]][sup [prime]] [ne] 0) radial modes'' in stabilizing the transport from the finite-[ital n] ITG ballooning modes. Detailing the parametric dependence of toroidal ITG turbulence is a key result.

• DOE Contract Number: AC03-89ER53277; W-7405-ENG-48
• OSTI ID: 7112122
• Journal Information: Physics of Plasmas; (United States), Vol. 1:7; ISSN 1070-664X
• Country of Publication: United States
• Language: English

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PLASMA SIMULATION
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CLOSED PLASMA DEVICES
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