Community Research and Development Information Service - CORDIS

Abstract

It is shown that the guiding centre motion around a single chain of magnetic islands in a tokamak can become chaotic in the presence of a single electrostatic drift wave. This process leads to radial diffusion across the islands without magnetic braiding. The chaotic diffusion appears to be selective in velocity space. Using realistic values of the physical parameters, it is deduced that this process can be effective in normal conditions; with the observed islands and electrostatic field values corresponding to measured density fluctuations, this diffusion concerns ions with velocities higher than thermal and almost all of the electron population. The consequences for radial diffusion are discussed.

Additional information

Authors: WEYSSOW B, Université Libre de Bruxelles, Bruxelles (BE);BALESCU R, Université Libre de Bruxelles, Bruxelles (BE);MISGUICH J H, CEA, Département de Recherches sur la Fusion Contrôlée, Saint-Paul-lez-Durance (FR)
Bibliographic Reference: Report: EUR-CEA-FC 1397 EN (1990) 57 pp.
Availability: Available from CEA, Département de Recherches sur la Fusion Contrôlée, Saint-Paul-lez-Durance (FR)
Record Number: 199011293 / Last updated on: 1994-12-01
Category: PUBLICATION
Original language: en
Available languages: en
Follow us on: RSS Facebook Twitter YouTube Managed by the EU Publications Office Top