Energy balance simulation of RF heated tokamak plasma in a hybrid reactor regime

The state, close to the stationary one, for RF heated tokamak with hybrid reactor-like parameters is discussed. The plasma is heated by the absorption of lower hybrid waves; for the absorption mechanism, a simple model is used. The dependences of the near-stationary state characteristics on density, temperature and thermal conductivity are discussed and the required amount of RF power is established, together with the amount of the driven current.The evidence of the necessity of the stabilization of the temperature via feed-back system is found; the global power balance for the thermal stability of the system is insufficient. More over, it seems, that the study of the realistic stationary state for RF driven reactors demands to consider only such models for energy balance discussions which are always completed with the explicit heating mechanism.As a final result — concerning hybrid reactor studies — the scaling for neutron fluxes is presented.The authors are indebted to Dr. R. Klíma for stimulating discussions.