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Abstract

Experiments in the tokamaks TEXTOR, CASTOR, T-10 and ISTTOK, as well as in the reversed field pinch RFX have provided new and complementary evidence on the physics of the universal mechanism of E × B velocity shear stabilization of turbulence, concomitant transport barrier formation and radial conductivity by using various edge biasing techniques.

In TEXTOR the causality between transport reduction and induced electric fields in the edge has been for the first time clearly demonstrated. In CASTOR the biasing electrode is placed at the separatrix in a non-intrusive configuration which has demonstrated strongly sheared electric fields and consequent improvement of the global particle confinement, as predicted by theory. In T-10 edge biasing is clearly improving the global performance of ECR heated discharges. On ISTTOK, the influence of alternating positive and negative electrode and (non-intrusive) limiter biasing has been compared. Electrode biasing is found to be more efficient in modifying the radial electric field E(r) and confinement, limiter biasing acting mainly on the SOL. In the RFX reversed field pinch it has been demonstrated that also in RFPs biasing can increase the local E × B velocity shear in the edge region, and hence substantially reduce the local turbulence driven particle flux mainly due to a change in the relative phase between potential and density fluctuations.

Additional information

Authors: VAN OOST G, Department of Applied Physics, Ghent University, Ghent (BE);ADÁMEK J, Institute of Plasma Physics, Association EURATOM/IPP.CR, Prague (CZ);DURAN I, Institute of Plasma Physics, Association EURATOM/IPP.CR, Prague (CZ);HRON M, Institute of Plasma Physics, Association EURATOM/IPP.CR, Prague (CZ);STÖCKEL J, Institute of Plasma Physics, Association EURATOM/IPP.CR, Prague (CZ);ANTONI V, Consorzio RFX, Associazione EURATOM-ENEA sulla Fusione, Padova (IT);MARTINES E, Consorzio RFX, Associazione EURATOM-ENEA sulla Fusione, Padova (IT);BALAN P, Department of Ion Physics, University of Innsbruck, Innsbruck (AT);IONITA C, Department of Ion Physics, University of Innsbruck, Innsbruck (AT);SCHRITTWIESER R, Department of Ion Physics, University of Innsbruck, Innsbruck (AT);BOEDO J A, Department of Mechanical and Aerospace Engineering, University of California, San Diego, La Jolla, CA (US);DEVYNCK P, Association EURATOM/CEA sur la fusion contrôlée, Saint Paul Lez Durance (FR);GUNN J P, Association EURATOM/CEA sur la fusion contrôlée, Saint Paul Lez Durance (FR);ELISEEV L, RRC Kurchatov Institute, Moscow, (RU);KIRNEV G S, RRC Kurchatov Institute, Moscow, (RU);MELNIKOV A, RRC Kurchatov Institute, Moscow, (RU);VERSHKOV, RRC Kurchatov Institute, Moscow, (RU);JACHMICH H, Laboratoire de Physique des Plasmas�Laboratorium voor Plasmafysica, Association Euratom-Belgian state�, Brussels (BE);VAN SCHOOR M, Laboratoire de Physique des Plasmas�Laboratorium voor Plasmafysica, Association Euratom-Belgian state�, Brussels (BE);WEYNANTS R R, Laboratoire de Physique des Plasmas�Laboratorium voor Plasmafysica, Association Euratom-Belgian state�, Brussels (BE);SILVA C, Centro de Fusão Nuclear-Association EURATOM/IST, Instituto Superior Técnico, Lisboa (PT);VARANDAS C, Centro de Fusão Nuclear-Association EURATOM/IST, Instituto Superior Técnico, Lisboa (PT);TENDLER M, Alfvén Laboratory, Royal Institute of Technology, Stockholm (SE)
Bibliographic Reference: An article published in: Plasma Physics and Controlled Fusion 45 (ICPP-CLUSTER issue)
Availability: This article can be accessed online by subscribers, and can be ordered online by non-subscribers, at: http://www.iop.org/EJ/S/UNREG/09O8T.DOoWVYW.7A6CEq7g/volume/0741-3335/45
Record Number: 200316015 / Last updated on: 2003-03-06
Category: PUBLICATION
Original language: en
Available languages: en
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