Bulletin of the American Physical Society
64th Annual Meeting of the APS Division of Plasma Physics
Volume 67, Number 15
Monday–Friday, October 17–21, 2022; Spokane, Washington
Session UO08: Plasma-Surface Interactions, Interfacial Plasmas, Emerging Applications
2:00 PM–4:36 PM,
Thursday, October 20, 2022
Room: 402 ABC
Chair: Elijah Thimsen, Washington Univ. St Louis
Abstract: UO08.00009 : Persistent Sputtering Yield Reduction in Plasma-Infused Materials for Plasma Propulsion and Fusion*
3:36 PM–3:48 PM
Presenter:
Richard E Wirz
(University of California, Los Angeles)
Authors:
angelica ottaviano
(University of California, Los Angeles)
Richard E Wirz
(University of California, Los Angeles)
Gary Wan
(university of california, los angeles)
Graeme T Sabiston
(university of california, los angeles)
Mary F Konopliv
(University of California, Los Angeles)
Anirudh Thuppul
(University of California, Los Angeles)
In particular, we have shown that metallic foams provide geometric trapping and interface/sheath manipulation that can exhibit persistent sputtering yield reductions of 40% to over 80% compared to a flat surface under 100 to 300 eV argon plasma bombardment. These results show a strong yield dependence based on the relationship between foam geometry and plasma sheath size. For foam pore sizes near or larger than the sheath thickness, the plasma infuses the foam and transitions the plasma-surface interactions from superficial to volumetric phenomena. By defining a plasma infusion parameter, the sputtering behavior can be separated into the plasma-facing and plasma-infused regimes. While plasma infusion leads to a larger effective sputtering area, geometric recapture of ejected particles facilitates an overall reduction in yield. For a given level of plasma infusion, the reductions in normalized yield are more pronounced at lower ion energies since angular sputtering effects enable more effective geometric recapture of sputterants. Opportunities for plasma-infused materials in space propulsion and fusion will be discussed.
*ARPA-E DOE Fusion Energy Sciences Award No. DE-AR0001378
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