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High particle and power fluxes in fusion reactors lead to erosion of plasma facing components, caused by physical sputtering or chemical erosion. The sputtered atoms may penetrate into the plasma bulk region and reduce the fusion power by dilution of plasma fuel. Furthermore, cooling by line-radiation lowers the fusion power since heavy elements do not lose all of their electrons even in the hot plasma centre.
In preliminary studies for a tungsten divertor experiment at ASDEX Upgrade, a definite amount of the element tungsten (10E17 atoms) was injected into the plasma by means of laser ablation. Confinement times were determined for ohmically heated discharges and for those with additional heating.

Additional information

Authors: ASMUSSEN K, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE)
Bibliographic Reference: Report: IPP 10/2 EN (1996) 131pp.
Availability: Available from the Max-Planck-Institut für Plasmaphysik, 85748 Garching bei München (DE)
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