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

Dataset · Fri Jan 11 00:00:00 EST 2019

DOI:https://doi.org/10.7910/DVN/TLXCDQ· OSTI ID:1881217

Woller, Kevin; Whyte, Dennis; Wright, Graham

The DIONISOS experiment is used to study the impact of RF helium (He) plasma on the surface morphology of tungsten (W). Modulation of incident He ion energy with a span on the order of 50 eV and below the sputtering threshold at a frequency of 13.56 MHz results in nano-tendril bundles (NTBs) and free-standing W whiskers on the surface at 1020 K. The NTBs are distributed intra-granularly with coverage of less than 10% while reaching up to 30 microns normal to the surface for He ion fluence of 5.8 x 10^25 m^-2 and a flux density of 1.0 x 10^22 m^-2 s^-1. Analysis of the NTB interior and sub-surface structure is provided through focused ion beam cross section.

• Research Organization: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center
• Sponsoring Organization: USDOE Office of Science (SC), Fusion Energy Sciences (FES)
• DOE Contract Number: SC0002060
• OSTI ID: 1881217
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY