FLUCTUATION-INDUCED FLUX AT THE PLASMA EDGE IN TOROIDAL DEVICES

Fluctuation-induced fluxes have a bursty character. As a consequence, a significant part of the total particle flux is carried out by sporad ic, large transport bursts. The local flux distribution function is co nsistent with a near-Gaussian character of the fluctuations. The radia l dependence of the statistical properties of plasma fluctuations and induced fluxes have been investigated in the plasma boundary region of the TJ-I tokamak [I. Garcia-Cortes et al., Phys. Fluids B 4, 4007 (19 92)] and the TJ-IU torsatron [E. Ascasibar et al., in Plasma Physics a nd Controlled Fusion Research, Proceedings of the 15th Conference on P lasma Physics and Controlled Nuclear Fusion Research, Seville (Interna tional Atomic Energy Agency Vienna, in press)]. There is a striking si milarity between the statistical properties of turbulent transport in both devices. (C) 1996 American Institute of Physics.