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The focus of this research was the role of oxygen in the interaction between the plasma and a range of boron/carbon and silicon/carbon materials now widely used as wall materials or coatings in fusion reactors. The effect of energetic oxygen particles was simulated by bombardment with a beam of O(2)(+)-ions. The reaction products emitted by the sample were identified by means of residual gas mass spectroscopy. Chemical erosion, retention capacity and gas release were also investigated, as were the directly emitted reaction products without wall contact and the energy distribution of these in relation to the temperature of the sample. The measurements obtained throw new light on the erosion processes and release mechanisms where molecules are emitted through chemical erosion and thus make it possible to explain the reduction in oxygen and carbon impurities through the use of B/C and Si/C materials.

Additional information

Authors: REFKE A, Forschungszentrum Jülich GmbH (KFA) (DE)
Bibliographic Reference: Report: EN (1995) 119 pp.
Availability: Available from Zentralbibliothek der Forschungszentrum Jülich GmbH, Postfach 1913, 5170 Jülich (DE)
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