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Effect of rhenium addition on tungsten fuzz formation in helium plasmas

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Abstract

The effect of the addition of rhenium to tungsten on the formation of a nanostructure referred to as ‘fuzz’ when exposed to helium plasmas at fusion relevant ion fluxes was investigated in the Magnum and Pilot PSI devices at the FOM Institute DIFFER. The effect rhenium had on fuzz growth was seen to be dependent on time, temperature and flux. Initial fuzz growth was seen to be highly dependent on grain orientation, with rhenium having little effect. Once the fuzz was fully developed, the effect of grain orientation disappeared and the rhenium had an inhibiting effect on growth. This could be beneficial for inhibiting fuzz growth in a future fusion reactor, where transmutation of tungsten to rhenium is expected. It also appears that erosion or annealing of the fuzz is limiting growth of fuzz at higher temperatures in the range of ∼1340 °C.

Year of Publication
2016
Journal
Journal of Nuclear Materials
Volume
474
Issue
June
Number of Pages
99-104
DOI
PId
6e37a7c3b71e9aee1691985b089be00c
Alternate Journal
J. Nucl. Mater.
Journal Article
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