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Tokamak plasmas are maintained far from thermodynamic equilibrium by the externally applied sources (heating, current drive). The resulting turbulent states are usually characterised by two different scales. There are large-scale phenomena with low poloidal mode numbers and a radial scale much larger than the typical ion Larmor radius rho(i) (for instance, steady magnetic islands). Simultaneously there is small-scale electromagnetic turbulence with large poloidal mode numbers and radial scale of the order of rho(i). A nonlinear theory has been developed which couples MHD and kinetic effects, assuming that the two scales are well separated. The particles were assumed to move in an electromagnetic field which to lowest order can be taken to be quasi-helical near the main rational surfaces.

Additional information

Authors: MASCHKE E K, CEA, Département de Recherches sur la Fusion Contrôlée, CEN Cadarache, Saint-Paul-lez-Durance (FR)
Bibliographic Reference: Paper presented: 1993 International Sherwood Fusion Theory Conference, Newport, Rhode Island (US), March 28-31, 1993
Availability: Text not available
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