Journal
MATERIALS TRANSACTIONS
Volume 46, Issue 3, Pages 561-564Publisher
JAPAN INST METALS & MATERIALS
DOI: 10.2320/matertrans.46.561
Keywords
tungsten; helium plasma; hole; helium bubble
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Surface modification of polycrystal tungsten due to low-energy and high-flux helium plasma exposure was investigated. Micron-sized holes and bubbles were formed on the surface at a surface temperature of 2200 K even when the incident ion energy of helium was 10eV. Hole formation was significantly reduced on the surface when the incident ion energy of helium was around 5 eV and no surface modification was seen at less than 5 eV. Coalescence of micron-sized helium bubbles was observed in the cross section of a W sample.
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