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Abstract

A statistical model is presented of a collective electrostatic configuration, described by Vlasov equation, interacting, through exchange of charged particles, with an infinite homogeneous medium of individual particles. The marginal linear instability of a collective mode in the medium and to a minimum of the entropy of the collective configuration calculated with suitable course graining and physical constraints. When the nonlinear terms are taken into account the entropy has a maximum corresponding to an equilibrium with a definite fluctuation level of the interacting systems. The model is applied to the electrostatic drift modes destabilized by the toroidal geometry of the tokamak. The interaction with the medium produces as well a fluctuation of the charges which participate to the electron parallel current of the tokamak. This fluctuating current is divergenceless and creates a braided magnetic field and an anomalous thermal diffusivity of the electrons. The magnitude and the scaling of the electron thermal conductivity are consistent with the observations in ohmic discharges.

Additional information

Authors: MINARDI E CONSIGLIO NAZIONALE DELLE RICERCHE, ISTITUTO DI FISICA DEL PLASMA, MILANO (ITALY), CONSIGLIO NAZIONALE DELLE RICERCHE, ISTITUTO DI FISICA DEL PLASMA, MILANO (ITALY)
Bibliographic Reference: WRITE TO ISTITUTO DI FISICA DEL PLASMA, VIA BASSANI, 14, 20133 MILANO (ITALY), MENTIONING REPORT FP 84/22, 1984
Record Number: 1989123050600 / Last updated on: 1987-01-01
Category: PUBLICATION
Available languages: en
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