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Abstract

Low-frequency/long-wavelength density turbulence is found to be reduced within the volume enclosed by an electron thermal internal transport barrier generated with lower hybrid microwave heating in the JET tokamak. The turbulence reduction coincides with a region (typically r/a<0.4) of negative, or reversed magnetic shear s and reduced electron thermal diffusion [chi]e. In the tokamak edge region (r/a>0.8), the turbulence amplitude is also reduced coinciding with large positive magnetic shear s>1. Estimates of the core turbulence wavelengths ([delta]-perpendicular>0.1m) are not in agreement with expectations from electron temperature gradient instabilities.

Additional information

Authors: CONWAY G D, Max-Planck-Institut für Plasmaphysik, EURATOM-Association IPP, Garching (DE);HOGEWEIJ G M D, FOM-Instituut voor Plasmafysica, Associatie EURATOM-FOM (NL);DE BAAR M R, FOM-Instituut voor Plasmafysica, Associatie EURATOM-FOM (NL);BARANOV Yu, EURATOM/UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);HAWKES N C, EURATOM/UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);MAILLOUX J, EURATOM/UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);ZASTROW K-D, EURATOM/UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);BARSLEY R, Department of Physics and Astronomy, University of Leicester (GB);LITAUDON X, Association EURATOM-CEA Cadarache, St-Paul-lez-Durance (FR);RIMINI F G, Association EURATOM-CEA Cadarache, St-Paul-lez-Durance (FR);RIGHI E, EFDA-CSU, Garching (DE)
Bibliographic Reference: An article published in: Plasma Physics and Controlled Fusion, 44 (July 2002), pp. 1167-1180
Availability: This article can be accessed online by subscribers, and can be ordered online by non-subscribers, at: http://stacks.iop.org/0741-3335/44/1167
Record Number: 200215042 / Last updated on: 2002-07-29
Category: PUBLICATION
Original language: en
Available languages: en