Transport Driven by G Modes and Resistive Drift Waves Based on Scale Invariance

Scale transformation introduced by Connor and Taylor is applied to the model equations for the resistive interchange mode (g mode) and the resistive drift wave in a high shear helical system. The electron pressure gradient term in Ohm's law is essential in deriving the present results. Scaling of collisionless transport along stochastic fields due to the g modes coincides with the result based on the mixing length theory. When the resistive drift waves are dominant, the predicted transport is k 2 / s 2 times the pseudo-classical transport, where k is the characteristic length of density gradient and s is the shear parameter. The transport coefficient which results from the g mode and/or the resistive drift wave turbulence increases towards the edge. The density fluctuation for the resistive drift wave turbulence scales as ( T e / n ) 1/2 k which also increases toward the edge in most toroidal plasmas.