Micron-Bubble Formation on Polycrystal Tungsten due to Low-Energy and High-Flux Helium Plasma Exposure

Dai Nishijima; Mitsutaka Miyamoto; Hirotomo Iwakiri; Minyou Ye; Noriyasu Ohno; Kazutoshi Tokunaga; Naoki Yoshida; Shuichi Takamura

doi:10.2320/matertrans.46.561

Dai Nishijima, Mitsutaka Miyamoto, Hirotomo Iwakiri, Minyou Ye, Noriyasu Ohno, Kazutoshi Tokunaga, Naoki Yoshida, Shuichi Takamura

Author information

Dai Nishijima
Department of Energy Engineering and Science, Graduate School of Engineering, Nagoya University
Mitsutaka Miyamoto
Department of Material Science, Interdisciplinary Faculty of Science and Engineering, Shimane University
Hirotomo Iwakiri
Research Institute for Applied Mechanics, Kyushu University
Minyou Ye
Max-Planck-Institut fuer Plasmaphysik, EURATOM Association Boltzmannstr. 2
Noriyasu Ohno
EcoTopia Science Institute, Nagoya University
Kazutoshi Tokunaga
Research Institute for Applied Mechanics, Kyushu University
Naoki Yoshida
Research Institute for Applied Mechanics, Kyushu University
Shuichi Takamura
Department of Energy Engineering and Science, Graduate School of Engineering, Nagoya University

Keywords: tungsten, helium plasma, hole, helium bubble

JOURNAL FREE ACCESS

2005 Volume 46 Issue 3 Pages 561-564

DOI https://doi.org/10.2320/matertrans.46.561

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Abstract

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 10 eV. 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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