Self-organization of tokamak plasma

The effect experimentally observed determining definite optimal profiles of plasma current and pressure density distribution is explained by the supposition on the existence of relaxation state of tokamak plasma. This state corresponds to minimum total energy at the given current. At optimal power contribution, when current and pressure density profiles being also optimal, ohmic scaling of confinement can advance rather deep in density, i.e. according to βp. When power contribution profile deviating from optimal one, plasma ''resists'' to deviation from optimal profiles, the higher is βp the greater is resistance. In this case rearangement of heat conductivity profile occurs to conserve the relaxation state. Non-optimal profiles can lead to degradation of global energy high time, that can be phenomenologically connected with excitation of magnetic noises of excess free energy in plasma. The given argumentation permits to understand qualitatively physics of tokamak plasma self-organization