Abstract
The DIONISOS experiment is used to study the impact of RF helium (He) plasma on the surface morphology of tungsten (W) at a frequency of 13.56MHz. Helium ion energy distributions with a span of 70–75eV, while still below the sputtering threshold result in nano-tendril bundles (NTBs) and free-standing W whiskers on surfaces at 1020K. The NTBs are distributed intragranularly with coverage of less than 10% while reaching up to 30µm normal to the surface for He ion fluence of 7.6 ×1025m−2 and flux density of 1022m−2s−1. Analysis of the NTB interior and sub-surface structure is provided through focused ion beam cross section.
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