Limiter Biasing Experiments in TEXTOR-94 |
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| Authors: | T. Loarer J. Gunn J. L. Lachambre E. Gravier C. Boucher K. H. Finken M. Lehnen G. Mank S. Jachmich H. Van Goubergen G. Van Oost |
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| Affiliation: | (1) Association EURATOM-CEA sur la fusion contrôlée CEN Cadarache, F-13108 Saint-Paul-Lez-Durance Cédex, France;(2) INRS-Energie et Matériaux, Université du Québec, Varennes, J3X 1S2, Canada;(3) EURATOM Association, Partner in Trilateral Euregio Cluster, Institut für Plasmaphysik, Forschungszentrum, Jülich GmbH, D-52425 Jülich, Germany;(4) Laboratory for Plasmaphysics, Ecole Royale Militaire - Koninklijke Militaire School, Association "EURATOM-Belgian State", Partner in Trilateral Euregio Cluster, B-1000 Brussels, Belgium;(5) Department of Applied Physics, University of Gent, B-9000 Gent, Belgium |
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| Abstract: | Particle collection by the ALT-II belt limiter in the TEXTOR-94 tokamak is exclusively limited to the parallel outflux because the scoop walls that are oriented parallel to the field lines obstruct the poloidal E×B mass flow. With normal Btor direction (E×B towards the scoops), a threefold decrease of plenum pressure is measured during negative biasing, while with reversed Btor (E×B away from the scoops), a 60% pressure increase is observed. This behaviour is exactly opposite to that observed in X-point divertors. A simple fluid model explains this apparent contradiction, and gives good quantitative agreement with measurements of the parallel Mach number in the SOL. The essential physics is governed by the Bohm-Chodura criterion. |
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