Observations of neoclassical and anomalous resistivity in toroidal discharges

Plasma resistivity measurements parallel to the magnetic field have been made on the .Wisconsin supported octupole and the Wisconsin levitated octupole. Plasmas ranged in density from 108 cm-3 to 1012 cm-3 and varied from highly collisionless to highly collisional. The measured resistivity was found to agree with neoclassical resistivity theory in the collisional and transition regimes. Highly collisionless plasmas were found to have anomalously high resistivity which obeyed the T/sub e//sup 1/2//n/sub e/ scaling of the transition regime