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Abstract

ABOVE 1200 K ION BOMBARDMENT OF GRAPHITE RESULTS IN AN ANOMALOUS RADIATION INDUCED SUBLIMATION (RISU) WHICH HAS BEEN ATTRIBUTED TO THE DIFFUSION OF C SELF-INTERSTITIALS TO PLANE GRAPHITE SURFACES. IN THE PRESENT PAPER, NEW EXPERIMENTAL RESULTS ON THE RISU YIELD ARE PRESENTED WITH SPECIAL EMPHASIS ON ITS FLUX DEPENDENCE. IN THE MAIN PARAMETER RANGE INVESTIGATED THE YIELD IS ABOUT 5 AND APPEARS TO BE INDEPENDENT OF THE ION FLUX. SIMPLE MODELS BASED ON THE ASSUMPTION THAT THE RISU YIELD IS CONTROLLED BY THE INTERNAL SINK DENSITY FOR INTERSTITIALS PREDICT A CORRELATION BETWEEN FLUX DEPENDENCE, TEMPERATURE DEPENDENCE AND ABSOLUTE VALUES OF THE YIELD WHICH IS NOT CONFIRMED BY EXPERIMENTAL DATA. POSSIBLE EXPLANATIONS FOR THIS DISCREPANCY ARE DISCUSSED. IT IS CONCLUDED THAT THE RISU YIELDS TO BE CONSIDERED FOR FUSION REACTOR CONDITIONS ARE COMPARABLE WITH THOSE OBSERVED UNDER PRESENT ION BEAM CONDITIONS.

Additional information

Authors: PHILIPPS V, KFA, JUELICH, D;VIETZKE E, KFA, JUELICH, D;SCHORN R P, KFA, JUELICH, D;TRINKAUS H KFA, JUELICH, D, KFA, JUELICH, D
Bibliographic Reference: JOURNAL OF NUCLEAR MATERIALS, VOLS. 155-157, PP 319-323, 1988
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