Scaling studies of beam-heated tokamaks

Parametric scaling of neutral beam-heated tokamaks is examined to determine the trade-off between beam energy and power. It is shown that when the plasma thermal conductivity is inversely proportional to the local density, the center mean plasma temperature is a function of P/sub A/E/sub B//sup delta/, where E/sub B/ and P/sub A/ are the beam energy and incident beam power per unit area, respectively. The parameter, delta, which depends only upon the plasma density profile, is of order unity.