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In tokamaks, the influence of high heat fluxes on the depth of heat affected zones on pure beryllium metal and beryllium containing very low levels of surface active impurities, has been studied by using a two-dimensional transient computer model which solves the equations of motion and energy. Results are presented for a range of energy densities and disruption times. It is demonstrated that under certain conditions, impurities, through their effect on surface tension, create convective flows, hence exercising an influence in the flow intensities and resulting depths of beryllium molten layers during plasma disruptions. The calculated depths of molten layers are also compared with other mathematical models that have been based on the assumption that heat is transported through the material by conduction only.

Additional information

Authors: TSOTRIDIS G, JRC Petten (NL);ROTHER H, JRC Petten (NL)
Bibliographic Reference: Article: Fusion Technology
Record Number: 199510942 / Last updated on: 1995-08-10
Original language: en
Available languages: en