An equilibrium model for helicity injector operation

The Helicity Injected Tokamak (HIT) experiment is a low aspect ratio (A = 1.5) tokamak formed and sustained by helicity injection. A critical issue facing its operation is the efficiency of the helicity injector. In order to study this, an equilibrium model of the injector has been developed which assumes that the open field-lines in the injector and the edge region are in force-free equilibrium with a uniform resistivity (...