RESULTS FROM CURRENT DRIVE EXPERIMENTS ON THE HELICITY INJECTED TORUS

The Helicity Injected Torus [T. R. Jarboe, Fusion Technol. 15, 7 (1989 )] is a low aspect ratio tokamak that is formed and sustained by coaxi al helicity injection with no transformer. Toroidal plasma currents of over 200 kA have been achieved with electron temperatures in the 100 eV range and electron density between 10(19) and 10(20) m(-3). The maj or radius is 0.3 m and the minor radius is 0.2 m. New results from equ ilibrium and stability analysis of the external magnetic diagnostics a nd new results from the Transient Internal Probe (TIP), an internal ma gnetic held diagnostic, are presented. A mechanism for the transfer of current drive on the open to the closed flux regions is presented. (C ) 1998 American Institute of Physics.