Influence of an External AC Electric Field on Plasma Turbulence in the Tokamak Near-Wall Layer

• Published in: Plasma physics reports Vol. 44; no. 3; pp. 303 - 311
• Main Authors: Shurygin, R. V., Melnikov, A. V.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01-03-2018; Springer Nature B.V
• Subjects: 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Atomic; BALLOONING INSTABILITY; Computational fluid dynamics; Computer simulation; COMPUTERIZED SIMULATION; ELECTRIC FIELDS; Fluid flow; HYDRODYNAMICS; LAYERS; Molecular; NONLINEAR PROBLEMS; Optical and Plasma Physics; Physics; Physics and Astronomy; PLASMA; Plasma turbulence; Stability; TOKAMAK DEVICES; Tokamaks; TURBULENCE; Vorticity
• ISSN: 1063-780X; 1562-6938
• DOI: 10.1134/S1063780X18030078

Braginskii reduced equations of two-fluid hydrodynamics are modified to take into account the presence of an external ac electric field localized in the tokamak near-wall layer. Numerical simulations show that, after reaching certain amplitude, such a field oscillating with the frequency ω ≈ ω
GAM
is capable of suppressing turbulent processes. The turbulence suppression mechanism consists in a sharp decrease in the growth rate of drift-resistive ballooning instability due to the appearance of additional nonlinear terms related to the external field in the equation for the vorticity.