A MODEL REALIZATION OF SELF-ORGANIZED CRITICALITY FOR PLASMA-CONFINEMENT

A model for plasma transport near marginal stability is presented. The model is based on subcritical resistive pressure-gradient-driven turb ulence. Three-dimensional nonlinear calculations based on this model s how effective transport for subcritical mean profiles. This model exhi bits some of the characteristic properties of self-organized criticali ty. Perturbative transport techniques are used to elucidate the transp ort properties. Propagation of positive and negative pulses is studied . The observed results suggest a possible explanation of the apparent nonlocal effects observed with perturbative experiments in tokamaks. ( C) 1996 American Institute of Physics.