Plasma and Fusion Research

Volume 15, 1205061 (2020)

Rapid Communications

Dust Formation from Arc Spots on Nanostructured Tungsten Surface
Miyuki YAJIMA, Shin KAJITA1), Noriyasu OHNO2), Suguru MASUZAKI, Naoaki YOSHIDA3), Damien U. B. AUSSEMS4), Thomas W. MORGAN4), Kirill BYSTROV4) and Hennie van der MEIDEN4)
National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan
1)
IMaSS, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
2)
Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
3)
Research Institute for Applied Mechanics, Kyushu University, Fukuoka 816-8580, Japan
4)
DIFFER - Dutch Institute for Fundamental Energy Research, De Zaale 20, 5612 AJ Eindhoven, the Netherlands
(Received 20 April 2020 / Accepted 2 July 2020 / Published 6 August 2020)

Abstract

Arcing experiments were conducted in the linear plasma device Pilot-PSI, where a pulsed plasma was superimposed to a steady state plasma. The arcing was observed by a fast framing camera, and the sample was analyzed with a transmission electron microscope. Observations of glowing objects released from the sample in response to the arcing and destruction of the fuzzy layer at the edge of the arc trail without significant melting suggested that dust was formed and released from the surface in response to arcing.

Keywords

He irradiation, tungsten, arcing, metallic dust

DOI: 10.1585/pfr.15.1205061

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