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Erosion of graphite by radiation enhanced sublimitation due to neutron bombardment with an energy spectrum such as expected in a fusion reactor is estimated theoretically. Carbon atoms released from their lattice sites in collision cascades initiated by the neutron bombardment are able to diffuse to the graphite surfaces and sublime thermally. The production rate of interstitial carbon atoms is calculated from neutron irradiation damage theory. The yields are about 1 or 2 orders of magnitude larger than the forward physical sputtering yield of neutrons due to collision cascades in the near surface layer. Both physical sputtering and radiation enhanced sublimitation due to fast neutron irradiation are nearly 3 orders of magnitude smaller than ion and charge exchange neutral atom sputtering.

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Authors: FRANZEN P, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE)
Bibliographic Reference: Article: Journal of Nuclear Materials, Vol. 228 (1996) pp. 1-7
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