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Abstract

Inter-machine studies of wall conditioning with the ICRF discharges have been performed in the limiter (TEXTOR) and divertor (ASDEX Upgrade (AUG)) tokamaks in the presence of a toroidal magnetic field (larger or similar to 2 T) using the conventional ICRF antennas without modifications in hardware. The vessel oxidation treatment by pulsed ICRF discharges in (He + O(2))-mixture (TEXTOR) is analyzed in terms of ratios of the RF pulse length to the O(2)-puff duration. A successive set of deuterium and helium ICRF discharges was developed for post-oxidation wall cleaning and analyzed in the light of TEXTOR recovery to the normal plasma operation. A new scenario of ICRF wall conditioning in (He + H(2))-mixture at two frequencies was applied in AUG and compared with the standard glow discharge in terms of outgassing efficiency. Modeling of the absorbed RF power was done to clear up a role of the H(2) concentration in the homogeneity of ICRF plasmas and the generation of high-energy ions.

Additional information

Authors: LYSSOIVAN A, Association EURATOM-BELGIAN STATE, Brussels (BE);KOCH R, Association EURATOM-BELGIAN STATE, Brussels (BE);VAN EESTER D, Association EURATOM-BELGIAN STATE, Brussels (BE);VAN WASSENHOVE G, Association EURATOM-BELGIAN STATE, Brussels (BE);VERVIER M, Association EURATOM-BELGIAN STATE, Brussels (BE);WEYNANTS R, Association EURATOM-BELGIAN STATE, Brussels (BE);FREISINGER M, Institut für Plasmaphysik, Forschungszentrum Jülich, Association EURATOM/FZJ, Trilateral Euregio Cluster, Jülich (DE);KRETER A, Institut für Plasmaphysik, Forschungszentrum Jülich, Association EURATOM/FZJ, Trilateral Euregio Cluster, Jülich (DE);PHILIPPS V, Institut für Plasmaphysik, Forschungszentrum Jülich, Association EURATOM/FZJ, Trilateral Euregio Cluster, Jülich (DE);REIMER H, Institut für Plasmaphysik, Forschungszentrum Jülich, Association EURATOM/FZJ, Trilateral Euregio Cluster, Jülich (DE);SAMM U, Institut für Plasmaphysik, Forschungszentrum Jülich, Association EURATOM/FZJ, Trilateral Euregio Cluster, Jülich (DE);SERGIENKO G, Institut für Plasmaphysik, Forschungszentrum Jülich, Association EURATOM/FZJ, Trilateral Euregio Cluster, Jülich (DE);BOBKOV V, Max-Planck-Institut für Plasmaphysik, IPP-EURATOM Association, Garching (DE);FAHRBACH H-U, Max-Planck-Institut für Plasmaphysik, IPP-EURATOM Association, Garching (DE);HARTMANN D, Max-Planck-Institut für Plasmaphysik, IPP-EURATOM Association, Garching (DE);HERRMANN A, Max-Planck-Institut für Plasmaphysik, IPP-EURATOM Association, Garching (DE);NOTERDAEME J-M, Max-Planck-Institut für Plasmaphysik, IPP-EURATOM Association, Garching (DE);ROHDE V, Max-Planck-Institut für Plasmaphysik, IPP-EURATOM Association, Garching (DE);SUTTROP W, Max-Planck-Institut für Plasmaphysik, IPP-EURATOM Association, Garching (DE);GAUTHIER E, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);DE LA CAL E, Asociación EURATOM-CIEMAT, Madrid (ES)
Bibliographic Reference: An article published in: Journal of Nuclear Materials (2007), online edition
Availability: This article can be accessed online by subscribers, and can be ordered online by non-subscribers, at: http://www.sciencedirect.com/science/journal/00223115
Record Number: 200718985 / Last updated on: 2007-03-26
Category: PUBLICATION
Original language: en
Available languages: en