The influence of magnetic fluctuations on collisional drift-wave turbulence

Journal Article · Fri Nov 01 04:00:00 EST 1996 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.871580· OSTI ID:388221

Camargo, S J; Scott, B D; Biskamp, D ^[1]

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1. Max-Planck-Institut fuer Plasmaphysik, EURATOM Association, 85748 Garching bei Muenchen (Germany)

A two-dimensional isothermal collisional drift-wave turbulence model including magnetic fluctuations is studied numerically. The model has as limits the electrostatic collisional drift-wave and two-dimensional magnetohydrodynamic systems. The electromagnetic and electrostatic regimes for thermal gradient-driven (drift-wave) turbulence are decided by the parameter {cflx {beta}}=(4{pi}{ital nT}/{ital B}{sup 2})({ital L}{sup 2}{sub {ital s}}/{ital L}{sup 2}{sub {ital n}}), where {ital L}{sub {ital s}} and {ital L}{sub {ital n}} are the parallel and background profile scale lengths, respectively. Significant electromagnetic effects were found only for {cflx {beta}}{approximately}10 for most parameters, and were most pronounced in the strongly adiabatic regime for drift waves. The principal effect of the magnetic fluctuations is magnetic induction in the parallel force balance for electrons, which is linear. This diminishes the adiabaticity of the system by reducing the immediacy of the dissipative coupling between the density and electrostatic potential fluctuations. The transport was still found to be dominantly electrostatic even for {cflx {beta}}=10, although its level decreased with {cflx {beta}} due to reduced coherency in the coupling between {ital E}{times}{ital B} velocity and density fluctuations. {copyright} {ital 1996 American Institute of Physics.}

• OSTI ID: 388221
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 11 Vol. 3; ISSN 1070-664X; ISSN PHPAEN
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
COLLISIONAL PLASMA
DRIFT INSTABILITY
FLUCTUATIONS
HIGH-BETA PLASMA
MAGNETIC CONFINEMENT
PLASMA SIMULATION
TRANSPORT THEORY
TURBULENCE