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Abstract

Wall conditioning of fusion devices by the deposition of amorphous hydrogenated carbon (a-C:H) films onto all plasma facing surfaces (carbonization) has led to significant improvements of the plasma performance. The carbonization technique has been developed for the Julich tokamak TEXTOR, and has also successfully been applied in other machines. The coverage of the metallic wall material with a-C:H strongly reduces the release of metal and oxygen atoms during plasma-surface interaction processes. The energy radiated by these impurities out of hot plasma zones is decreased, which has opened up new operational regimes for the machines. A small concommittant increase of carbon impurities, which have low atomic number Z, is less deleterious for the plasma. The role of large area a-C:H deposition in fusion research is discussed with main emphasis on the impurity problem, possible further improvements and Tritium related aspects in future machines.

Additional information

Authors: WINTER J, Institut fur Plasmaphysik Kernforschungsanlage Julich GmbH (DE);ESSER H G, Institut fur Plasmaphysik Kernforschungsanlage Julich GmbH (DE);WAELBROECK F, Institut fur Plasmaphysik Kernforschungsanlage Julich GmbH (DE);WIENHOLD P, Institut fur Plasmaphysik Kernforschungsanlage Julich GmbH (DE)
Bibliographic Reference: Paper presented: E-MRS-Symposium on Amorphous Hydrogenated Carbon Films, Strasbourg (FR), June 2-5 1987
Availability: Available from (1) as Paper EN 34373 ORA
Record Number: 198910206 / Last updated on: 1994-12-01
Category: PUBLICATION
Original language: en
Available languages: en