High-Z Elements as Target Materials in Fusion Devices

TL;DRAbstract

The possible use of tungsten as divertor target material is discussed. In addition to its extremely low sputtering yields, another very favourable aspect of this material is the high probability of prompt redeposition. First experimental observations are encouraging. The erosion fluxes from a tungsten target tile are low and the ionization lengths as short as expected. Additional cooling of the edge region by adding neon seems permissible. Accumulation of tungsten is not observed as long as there is sufficient sawtooth activity in the plasma centre. (author). 8 refs, 3 figs.

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