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In this report visible spectroscopy and impurity investigations on ASDEX are reviewed and several sets of visible spectra are presented. As a basis for identification of metallic impurity lines during plasma discharges, spectra from a stainless steel-Cu arc have been recorded. A spectrum overview of ASDEX discharges is shown which reveals the dominating role of lines from light impurities like carbon and oxygen throughout the UV and visible range. Metallic impurity lines of neutrals or single ionised atoms are observed near localised surfaces. The dramatic effect of impurity reduction by boronisation of the vessel walls is demonstrated in a few examples. As an extension to some investigations already published, further diagnostic applications of visible spectroscopy are presented. Finally, the hardware and software system used on ASDEX are described in detail.

Additional information

Authors: HOFMANN J V, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE)
Bibliographic Reference: Report: IPP III/174 EN (1991) 138 pp.
Availability: Available from Max-Planck-Institut für Plasmaphysik, 8046 Garching bei München (DE)
Record Number: 199210533 / Last updated on: 1994-12-02
Original language: en
Available languages: en
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