INFLUENCE OF PHYSICS PARAMETERS ON TOKAMAK REACTOR DESIGN

Twelve important tokamak reactor parameters were surveyed, and the results of sensitivity studies serve as a guide for reactor design. Numerous magnetohydrodynamic equili1bria are studied to determine influences of geometry, pressure profile, safety factor, and beta on the plasma current. A steady-state transport model, which averages particle and power balances in flux space, reveals the effects of temperature and density profiles, impurities, and temperature on power density and n//i gamma . The blanket/shield thickness, major radius, and magnetic field are likewise shown to influence reactor performance. For a fixed beta and reactor power, the design is quite insensitive to the relative contributions of density and temperature profiles to the total pressure over a wide range of profile widths, whereas the current generally increases for more D-shaped plasmas.