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 centre mean plasma temperature is a function of Psub(A)Esub(B)sup(delta), where Esub(B) and Psub(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. (author)