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Examines the trajectories of neutral beam injected energetic ions in spherical tokamaks. Effect of a large poloidal magnetic field in the outboard region; Numerical solutions to the equations for particle motion; Possibility of additional orbit types in spherical tokamaks.

Tests theoretical predictions of ion and electron thermal diffusivities by comparing calculated and measured temperatures in low mode plasmas from the Tokamak Fusion Test Reactor nondimensional scaling experiments. Effects of density profile shape variations on the transport models; L-mode scaling dependence for the ion temperatures.

Assesses the potential performance, in deuterium-tritium plasmas, of an enhanced confinement regime with reversed magnetic shear. Estimation of equilibrium conditions for an enhanced reversed shear mode plasma by solving the plasma transport equations; Peak fusion power; Magnetohydrodynamic instabilities.

Tests the conjecture that the safety factor profile, q(r), controls the improvement in tokamak plasmas from poor confinement in the Low-(L-) mode regime to improved confinement in the supershot regime. Two experiments conducted on the Tokamak Test Reactor; Puffing of helium into the beam-heated phase of a supershot discharge.