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The effect on the guiding centre trajectories of the stochastic drifts due to the curvature of the stochastic magnetic lines is studied in the first part of this paper. It is shown that the subdiffusive square root of t behaviour of the mean square displacement of the particles cannot exist in a realistic magnetic configuration. The particles undergo a diffusive process even in the absence of the perpendicular collisional diffusion. The anomalous diffusion coefficient is estimated. The second part of this work deals with time dependent stochastic perturbations of the confining magnetic fields. It is shown that the time variation has a strong effect of decorrelating the particles from the magnetic lines. The diffusion coefficient is determined as a function of the correlation time of the stochastic field. The influence of a cross field collisional diffusion on the results of the two problems presented here is also estimated.

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Authors: VLAD M, CEA, CEN Cadarache, Saint-Paul-lez-Durance (FR);SPINEANU F, CEA, CEN Cadarache, Saint-Paul-lez-Durance (FR);MISGUICH J H, CEA, CEN Cadarache, Saint-Paul-lez-Durance (FR);BALESCU R, Association Euratom-Etat Belge sur la Fusion, Physique Statistique et Plasmas, Universite Libre de Bruxelles (BE)
Bibliographic Reference: Article : Physical Review E, Vol. 53 (1996) No. 5, pp. 5302-5314
Record Number: 199610827 / Last updated on: 1996-08-30
Original language: en
Available languages: en