Quasi-linear dynamo from resistive pressure-driven instabilities

The Hewett/Freidberg linear resistive MHD stability code was used to calculate the radial eigenfunctions of resistive interchange instabilities in the Reversed-Field Pinch (RFP). These data were used to calculate the quasi-linear dynamo emf. The resultant poloidal dynamo emf is found to be negative inside of reversal, zero at reversal and positive between reversal and the wall. This emf will oppose the resistive decay of toroidal magnetic flux inside of reversal. However, the lack of a dynamo emf at reversal prohibits the quasi-linear evolution of resistive pressure-driven modes from causing the increase in positive toroidal magnetic flux (i.e., the flux inside of reversal) that occurs on the ZT-40 device at Los Alamos