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  • Radial and poloidal ExB drifts in the scrape-off layers of a divertor tokamak : Effects on in/out asymmetries, plasma detachment at the targets, and divertor biasing

Abstract

The influence of radial and poloidal ExB drifts in the scrape-off layer of a divertor tokamak are considered. The poloidal drift for B in the forward direction tends to increase the plasma pressure and the recycling rates at the outer target, lowering the temperature. When the radial drift dominates, the asymmetries are reversed. Poloidal drifts can result in substantially reduced plasma contact at one target. The experimental observations made in the tokamak de Varennes, with divertor biasing arranged to increase/decrease the radial electric field in the SOL, relative to its natural level, are broadly consistent with the poloidal drift model.

Additional information

Authors: STANGEBY P C, University of Toronto, Institute for Aerospace Studies, Ontario (CA);CHANKLIN A V, JET Joint Undertaking, Abingdon, Oxon. (GB)
Bibliographic Reference: Report: JET-P(95)07 EN (1995) 29 pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
Record Number: 199510917 / Last updated on: 1995-08-10
Category: PUBLICATION
Original language: en
Available languages: en