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Plasma facing components in tokamak type fusion reactors are subjected to intense heat loads during plasma disruptions, which causes melting and evaporation of the surface layer. The influence of beam cross section of the incident energy on the depths of heat affected zones on pure tungsten metal, has been studied by using a 2-dimensional transient computer model which solves the equations of motion and energy. In this paper results are presented for relatively long disruption times for different beam cross sections and for a range of energy densities. It is demonstrated that there exists a critical value of cross section area beyond which any further increase has no appreciable influence on the resulting depths of molten layers. It is also demonstrated that as the cross section increases the convective flows caused by surface tension gradients due to variants of surface impurities are confined at regions close to the periphery of the molten zone, whereas at the centre of the molten pool heat is transported in the molten metal by conduction.

Additional information

Authors: TSOTRIDIS G, JRC Petten (NL)
Bibliographic Reference: Article: Fusion Technology (1996)
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