Electron temperature fluctuations in drift-resistive balooning turbulence
Three-dimensional nonlinear simulations of collisional plasma turbulence are presented to model the behaviour of the edge region of tokamak discharges. Previous work is extended by including electron temperature fluctuations. The basic paradigm that turbulence and transport are controlled by resistive ballooning modes in low temperature plasma and nonlinearly driven drift wave turbulence in higher temperature regimes persists in the new system. Parallel thermal conduction strongly suppresses the ability of the electron temperature gradient to drive the turbulence and transport everywhere except the very low temperature regional edge of the resistive ballooning regime only the density gradient drives the turbulence and the temperature fluctuations have a relatively strong stabilizing influence on the resulting turbulence. The stabilizing effect of the temperature fluctuations in the drift wave regime is a consequence of enhanced damping of density and potential fluctuations resulting from local electron heating. Expressions for the anomalous particle and electron thermal transport coefficients are presented, which are independent of the electron temperature gradient.
Bibliographic Reference: Article: IPP 5/69 (1996) pp. 1-21
Record Number: 199611229 / Last updated on: 1996-11-11
Original language: en
Available languages: en