THEORY OF “CLUMPS” IN DRIFT-WAVE TURBULENCE IN TOKAMAK PLASMA

Basing on the new method of trajectory stochastic treatment advanced by one of the authors of this paper, the theory of “clumps” in drift -wave turbulence in tokamak plasmas has been developed. It is shown that, as a longer time behaviour, plasmas in tokamaks will have the same “clumps” effects as those in uniform magnetic fields, although the diffusion crossing magnetic field Lines in tokmaks will be enhanced. The influence of the non-uniformity of the magnetic field, such as curvature, shear, etc., on the transverse diffusion and the “clump” life-time is discussed.