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Abstract

In Tore Supra long pulses, particle balance gives evidence that a constant fraction of the injected gas is retained in the wall all along the shot (typically 50%), showing no sign of wall saturation after more than 6 minutes of discharge. During the discharge, the retention rate first decreases (phase 1), then remains constant throughout the pulse (phase 2). Phase 1 could be interpreted as implementation of particles combined with a constant codeposition rate, while phase 2 could correspond too codeposition alone, once the implanted surfaces are saturated with deuterium. This paper presents a possible contribution of charge exchange neutrals to the implantation process, based on modelling results with the Eirene neutral transport code. A complex pattern of particle implantation is evidenced, with saturation time constants ranging from less than one to several hundreds seconds, compatible with the experimental behaviour during phase 1.

Additional information

Authors: TSITRONE E, Institut fur Plasmaphysik, Forschungszentrum Julich, Association EURATOM/FZJ, Trilateral Euregio Cluster, Julich (DE);ET AL, Institut fur Plasmaphysik, Forschungszentrum Julich, Association EURATOM/FZJ, Trilateral Euregio Cluster, Julich (DE)
Bibliographic Reference: An oral paper given at: 16th Int. Conf. on Plasma Surface Interaction in controlled Fusion Devices Organised by: Massachusetts Institute of Technology, Plasma Science & Fusion Center, Cambridge (US) Held at: Holiday Inn By The Bay, Portla
Availability: Available from Association EURATOM-CEA, Departement de Recherches sur la Fusion Controlee, CEA Cadarache, F-13108 St Paul-Lez-Durance, France Tel: (+33) 4 42 25 70 01; Fax: (+33) 4 42 25 64 21 E-mail: dirdrfc@drfc.cad.cea.fr
Record Number: 200417635 / Last updated on: 2004-07-13
Category: PUBLICATION
Original language: en
Available languages: en