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Critical gradient response of the Weiland model

Funded under: FP7-EURATOM

Abstract

The success the Weiland model has had in reproducing modulation experiments prompted this in-depth investigation into its behaviour as a critical gradient model (CGM). The critical gradient properties of the Weiland model is examined analytically and numerically and compared with the empirical CGM commonly used in experiment. A simplified Weiland CGM is derived in which the height-above-threshold dependence is not necessarily linear. Simultaneously, the validity of the empirical CGM was examined. It is shown that an effective threshold, which is higher than the instability threshold, can be obtained if pinches influence the diffusivity.

Additional information

Authors: WEILAND J, Chalmers University of Technology and EURATOM-VR Assocation, Göteborg (SE);STRAND P, Chalmers University of Technology and EURATOM-VR Assocation, Göteborg (SE);PARAIL V, EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);ASP E, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);GARBET X, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR)
Bibliographic Reference: An article published in: Plasma Physics and Controlled Fusion 49 (2007), pp. 1221-1243
Availability: This article can be accessed online by subscribers, and can be ordered online by non-subscribers, at: http://dx.doi.org/doi:10.1088/0741-3335/49/8/009
Record Number: 200719382 / Last updated on: 2007-09-11
Category: PUBLICATION
Original language: en
Available languages: en
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