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2023-05-08T00:24:57Z
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Accelerated/reduced growth of tungsten fuzz by deposition of metals
Kajita, Shin
Morgan, Thomas
Tanaka, Hirohiko
Hayashi, Yuki
Yoshida, Naoaki
Nagata, Daisuke
Vernimmen, Jordy
Feng, Shuangyuan
Zhang, Rongshi
Ohno, Noriyasu
open access
© 2021. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Tungsten
Helium
Fuzz
Deposition
Plasma
Nanostructure
From the helium (He) plasma irradiations to tungsten performed in the Magnum-PSI device, the effects of deposition of metals on the helium-plasma induced fiberform nanostructures (fuzz) are discussed. It was found that fuzz was not formed at the center of the plasma cylinder if there were significant metallic impurities from the source. Deposition of metallic impurities (mainly molybdenum and copper) counteracted the growth of fuzz. In addition to the effects of metals from the source, we installed a sputtering source near the sample to replicate the deposition environment in fusion devices. The thickness of fuzzy layer was ~7µm, which was about five times greater than that without deposition, at the He flux of 1.3×10^26 m^2 suggesting that the growth rate of fuzz layer was significantly accelerated due to the deposition of tungsten.
Elsevier
2023-05-01
2021-05
eng
journal article
AM
http://hdl.handle.net/2237/0002001605
https://nagoya.repo.nii.ac.jp/records/2001605
https://doi.org/10.1016/j.jnucmat.2021.152844
00223115
Journal of Nuclear Materials
548
152844
https://nagoya.repo.nii.ac.jp/record/2001605/files/magnum.pdf
application/pdf
764 KB
2023-05-01