PLASMA CIRCUIT INSTABILITY AND CURRENT DISRUPTION
The coupled system of the Ohm - Maxwell and transport equations is solved applying a 1-D code to the case of a one-fluid plasma in a cylindrical Tokamak. It is assumed that the current channel is surrounded by a large and cold plasma region in order to simulate the effect of cooling processes which have taken place in the boundary region during previous stages of the disruptive process. In this situation the resistive decoupling between poloidal and toroidal magnetic surfaces gives rise to a dissipative unstable mode (plasma circuit instability) such that the current shrinks and collapses on a time scale depending on the resistivity at the boundary. The current and temperature profiles are controlled by the parameter nqR/B-z and a very steep gradient is developed at high density.
Bibliographic Reference: WRITE TO CNR, ISTITUTO DI FISICA DEL PLASMA, VIA BASSINI, 15, 20133 MILANO (ITALY), MENTIONING REPORT FP 83/14, 1983
Record Number: 1989122051700 / Last updated on: 1987-01-01
Available languages: en