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The sputtering behaviour of a copper based alloy containing 17 at-% of lithium was studied under fusion relevant ion bombardment by D(+), He(+), Ne(+) and Ar(+) with energies between 0.1 keV and 6 keV and flux densities of up to 1.0 E16 particles/cmZs. The main aim was, to investigate whether surface segregation of the lithium component can balance the losses due to sputtering and evaporation, and whether this way a protective lithium surface layer can thus be maintained under high particle flux irradiation. To investigate time-dependent sputtering phenomena, laser-induced fluorescence spectroscopy (LIF) was employed to detect atoms emitted from the multicomponent material. With LIF, velocity distributions and absolute densities of Cu and Li were measured, making it possible to calculate absolute partial sputtering yields. The present Cu/Li material is found to be useless in a continuously operating fusion reactor. The alloy can only maintain a protective lithium surface layer at elevated temperatures in a pulsed reactor concept, when the plasma is operated with a limited duty-cycle. Moreover, a relatively high rate of lithium evaporation was measured at temperatures above 400 C, which further limits the application of Cu/Li alloys in fusion devices.

Additional information

Authors: SCHORN R P, Institut für Plasmaphysik, Kernforschungsanlage Jülich GmbH, Jülich (DE)
Bibliographic Reference: Report: Jül-2367 DE (1990) 118 pp.
Availability: Available from Zentralbibliothek der Kernforschungsanlage Jülich GmbH, Postfach 1913, 5170 Jülich (DE)
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