Accelerated/reduced growth of tungsten fuzz by deposition of metals

Shin Kajita; Thomas Morgan; Hirohiko Tanaka; Yuki Hayashi; Naoaki Yoshida; Daisuke Nagata; Jordy Vernimmen; Shuangyuan Feng; Rongshi Zhang; Noriyasu Ohno

doi:10.1016/j.jnucmat.2021.152844

Accelerated/reduced growth of tungsten fuzz by deposition of metals

Shin Kajita (Corresponding author), Thomas Morgan, Hirohiko Tanaka, Yuki Hayashi, Naoaki Yoshida, Daisuke Nagata, Jordy Vernimmen, Shuangyuan Feng, Rongshi Zhang, Noriyasu Ohno

Science and Technology of Nuclear Fusion

Research output: Contribution to journal › Article › Academic › peer-review

26 Citations (Scopus)

Abstract

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 ∼7 µm, which was about five times greater than that without deposition, at the He flux of 1.3×10²⁶ m⁻², suggesting that the growth rate of fuzz layer was significantly accelerated due to the deposition of tungsten.

Original language	English
Article number	152844
Number of pages	10
Journal	Journal of Nuclear Materials
Volume	548
DOIs	https://doi.org/10.1016/j.jnucmat.2021.152844
Publication status	Published - May 2021

Bibliographical note

Funding Information:
This work was supported in part by a Grant-in-Aid for Scientific Research 19H01874 , and Fund for the Promotion of Joint International Research 17KK0132 from the Japan Society for the Promotion of Science (JSPS).

Publisher Copyright:
© 2021

Funding

This work was supported in part by a Grant-in-Aid for Scientific Research 19H01874 , and Fund for the Promotion of Joint International Research 17KK0132 from the Japan Society for the Promotion of Science (JSPS).

Keywords

Deposition
Fuzz
Helium
Nanostructure
Plasma
Tungsten

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10.1016/j.jnucmat.2021.152844

Cite this

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title = "Accelerated/reduced growth of tungsten fuzz by deposition of metals",

abstract = "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 ∼7 µm, which was about five times greater than that without deposition, at the He flux of 1.3×1026 m−2, suggesting that the growth rate of fuzz layer was significantly accelerated due to the deposition of tungsten.",

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author = "Shin Kajita and Thomas Morgan and Hirohiko Tanaka and Yuki Hayashi and Naoaki Yoshida and Daisuke Nagata and Jordy Vernimmen and Shuangyuan Feng and Rongshi Zhang and Noriyasu Ohno",

note = "Funding Information: This work was supported in part by a Grant-in-Aid for Scientific Research 19H01874 , and Fund for the Promotion of Joint International Research 17KK0132 from the Japan Society for the Promotion of Science (JSPS). Publisher Copyright: {\textcopyright} 2021",

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doi = "10.1016/j.jnucmat.2021.152844",

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AU - Kajita, Shin

AU - Morgan, Thomas

AU - Tanaka, Hirohiko

AU - Hayashi, Yuki

AU - Yoshida, Naoaki

AU - Nagata, Daisuke

AU - Vernimmen, Jordy

AU - Feng, Shuangyuan

AU - Zhang, Rongshi

AU - Ohno, Noriyasu

N1 - Funding Information: This work was supported in part by a Grant-in-Aid for Scientific Research 19H01874 , and Fund for the Promotion of Joint International Research 17KK0132 from the Japan Society for the Promotion of Science (JSPS). Publisher Copyright: © 2021

PY - 2021/5

Y1 - 2021/5

N2 - 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 ∼7 µm, which was about five times greater than that without deposition, at the He flux of 1.3×1026 m−2, suggesting that the growth rate of fuzz layer was significantly accelerated due to the deposition of tungsten.

AB - 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 ∼7 µm, which was about five times greater than that without deposition, at the He flux of 1.3×1026 m−2, suggesting that the growth rate of fuzz layer was significantly accelerated due to the deposition of tungsten.

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Accelerated/reduced growth of tungsten fuzz by deposition of metals

Abstract

Bibliographical note

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Keywords

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