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Impact of helium ion energy modulation on tungsten surface morphology and nano-tendril growth

2017; IOP Publishing; Volume: 57; Issue: 6 Linguagem: Inglês

10.1088/1741-4326/aa67ac

ISSN

1741-4326

Autores

Kevin B. Woller, D.G. Whyte, G.M. Wright,

Tópico(s)

Metal and Thin Film Mechanics

Resumo

Time-modulated helium (He) ion energy (e.g. VBias = −50 + 25·sin(2πfRF · t), fRF = 13.56 MHz) is demonstrated to strongly affect the development of tungsten (W) surface morphology that results from He plasma irradiation in the DIONISOS linear plasma experiment. Nano-tendril bundles (NTBs), which appear as isolated 'islands' of nano-tendrils, can rapidly grow on an otherwise smooth W surface. This is in contrast to previously seen full-surface coverage of nano-tendril growth known as 'fuzz'. When tall NTBs form, less than 15% of the surface contains nano-tendrils. The NTB surface coverage changes with growth conditions and the total volume of nano-tendrils in the NTBs is observed to be up to a factor of 16 larger than when fuzz is grown. This indicates that long-range W surface transport underlies nano-tendril formation.

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