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Conditioning of the plasma-facing components of fusion devices such as inner wall surfaces and limiters is a necessary prerequisite to obtaining pure and stable fusion plasmas. Radiofrequency assisted dc-glow discharges in various gases (hydrogen, oxygen, methane) are a flexible tool for the production of reactive species, which remove from the wall surfaces reducible oxygen and carbon compounds, or enable well defined thin layers to be deposited thereon by plasmachemical processes. The carbonization technique, i.e. the in situ deposition of amorphous hydrogenated carbon layers (a-C:H) and the resulting effects on tokamak plasmas, are discussed in detail. Its application leads to significantly improved plasma performance. After its development and characterization at the Julich tokamak, TEXTOR, it is now in use worldwide.

Additional information

Authors: WINTER J, Kernforschungsanlage Julich GmbH (DE)
Bibliographic Reference: Report: Jül-2207 DE (1988)
Availability: Available from Zentralbibliothek der Forschungszentrum Jülich GmbH, Postfach 1913, 5170 Jülich (DE)
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