Isolated nano-tendril bundles on tungsten surfaces exposed to radiofrequency helium plasma

Author(s)
Woller, Kevin Benjamin; Whyte, Dennis G; Wright, Graham
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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 13.56 MHz. Helium ion energy distributions with a span of 70–75 eV, while still below the sputtering threshold result in nano-tendril bundles (NTBs) and free-standing W whiskers on surfaces at 1020 K. The NTBs are distributed intragranularly with coverage of less than 10% while reaching up to 30 µm 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. Keywords: Tungsten fuzz; Helium; Nano-tendril; RF sheath
Date issued
2017-05
URI
http://hdl.handle.net/1721.1/117086
Department
Massachusetts Institute of Technology. Plasma Science and Fusion Center
Journal
Nuclear Materials and Energy
Publisher
Elsevier BV
Citation
Woller, Kevin B. et al. “Isolated Nano-Tendril Bundles on Tungsten Surfaces Exposed to Radiofrequency Helium Plasma.” Nuclear Materials and Energy 12 (August 2017): 1282–1287 © 2017 The Authors
Version: Final published version
ISSN
2352-1791
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