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Abstract

Charge exchange spectroscopy (CXS), with either auxiliary or heating neutral beams, is a standard technique for the determination of ion temperature and impurity density profiles. Suitable near UV or visible lines are observed following charge exchange collisions populating highly excited levels. Generally lines from recombined hydrogen-like ions up to Ne are observed. Since carbon is, in some devices, the most abundant element the 5290.6 Angstrom CVI 8-7 line is almost universally analysed to deduce from line broadening, lineshift and radiance, respectively, the ion temperature, rotation velocity and the fully stripped carbon ion density. This report includes a description of the experimental setup of research in this field and of the use of the ergodic divertor as a tool for plasma edge diagnostics. Two discharges in which space-resolved observations of the CVI 8-7 line are analysed are also presented, to show the presence of CX-related effects. Finally, the usefulness of the reported results for probing neutral density at the plasma edge, by detecting CX excited impurity ions, is discussed.

Additional information

Authors: HESS W R, CEA, Département de Recherches sur la Fusion Contrôlée, CEN Cadarache, Saint-Paul-lez-Durance (FR);MATTIOLI M, CEA, Département de Recherches sur la Fusion Contrôlée, CEN Cadarache, Saint-Paul-lez-Durance (FR);GUIRLET R, CEA, Département de Recherches sur la Fusion Contrôlée, CEN Cadarache, Saint-Paul-lez-Durance (FR);DRUETTA M, Université de St. Etienne (FR)
Bibliographic Reference: Report: EUR-CEA-FC-1477 EN (1993) 22 pp.
Availability: Available from CEA, Département de Recherches sur la Fusion Contrôlée, Saint-Paul-lez-Durance (FR)
Record Number: 199310907 / Last updated on: 1994-11-29
Category: PUBLICATION
Original language: en
Available languages: en
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