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Conditioning of the plasma-facing components of fusion devices such as inner-wall surfaces and limiters is a necessary prerequisite for the obtention of pure and stable fusion plasmas. Radiofrequency assisted dc-glow discharges in various gases (hydrogen, oxygen, methane) make a flexible tool for the production of reactive species, which deplete the wall surfaces of reducible oxygen- and carbon-compounds, or allow well defined thin layers to be deposited onto them plasma-chemically. The carbonisation technique, i.e. the in-situ deposition of amorphous hydrogenated carbon layers (a-C:H) and the resulting effects on tokamak plasmas, is discussed in detail. Its application leads to significantly improved plasma performance. Following its development and characterisation at the Jülich tokamak TEXTOR it is now being used worldwide.

Additional information

Authors: WINTER J, Kernforschungsanlage Jülich GmbH, Jülich (DE)
Bibliographic Reference: Article: Journal of Nuclear Materials, Vol. 161 (1989), pp. 265-330
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