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The statistical representation of a fluctuating (stochastic) magnetic field configuration is studied in detail. The Eulerian correlation functions of the magnetic field are determined, taking into account all geometrical constraints. These objects form a non-diagonal matrix, contrary to statements appearing in the existing literature. The Lagrangian correlations, within the reasonable Corrsin approximation, are reduced to a single scalar function, determined by an integral equation. Finally, the mean square perpendicular deviation of a geometrical point moving along a perturbed field line is determined by a nonlinear second-order differential equation. The behaviour of the field line diffusion coefficient is discussed over the whole range of its characteristic parameter.

Additional information

Authors: WANG H-D, Université Libre de Bruxelles (BE);VLAD M, Université Libre de Bruxelles (BE);SPINEANU F, Université Libre de Bruxelles (BE);VANDEN EIJNDEN E, Université Libre de Bruxelles (BE);BALESCU R, Université Libre de Bruxelles (BE);MISGUICH J H, CEA, Département de Recherches sur la Fusion Contrôlée, CEN Cadarache, Saint-Paul-lez-Durance (FR)
Bibliographic Reference: Report: EUR-CEA-FC-1515 EN (1995) 44 pp.
Availability: Available from CEA, Département de Recherches sur la Fusion Contrôlée, Saint-Paul-lez-Durance (FR)
Record Number: 199510532 / Last updated on: 1995-04-11
Original language: en
Available languages: en