[Table of Contents]

Plasma and Fusion Research

Volume 8, 2402075 (2013)

Regular Articles

Agglomeration Process of Carbon Dusts in Laboratory Plasmas
Yoshito HASEGAWA, Naoko ASHIKAWA1), Atsushi M. ITO1), Takahiro KENMOTSU, Yudai MINAMI, Hiroaki NAKAMURA1), Masaki NISHIURA1) and Motoi WADA2)
Faculty of Life and Medical Sciences, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan
1)
National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan
2)
School of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan
(Received 7 December 2012 / Accepted 29 March 2013 / Published 19 June 2013)

Abstract

Micro-meter size carbon dusts have been formed in a 70 mm diameter, 370 mm long plasma container after running a 16 hour steady state Ar discharge. The formed carbon dusts have been observed by a scanning electron microscope (SEM) to identify their surface structures. The observed images have indicated that dusts with both flake and cauliflower structures were present on the surfaces of sample collectors. Carbon dusts with the flake structures exhibited smoother surfaces than dusts with cauliflower structures. Dust samples were also collected from arc spot parts of the carbon electrode surfaces by placing carbon compound adhesive tapes. Micro-meter size dusts were found collected on the surface of the tapes, indicating formation of dusts during arc discharges.

Keywords

carbon dust, hydrogen, agglomeration, plasma wall interaction, sputtering

DOI: 10.1585/pfr.8.2402075

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This paper may be cited as follows:

Yoshito HASEGAWA, Naoko ASHIKAWA, Atsushi M. ITO, Takahiro KENMOTSU, Yudai MINAMI, Hiroaki NAKAMURA, Masaki NISHIURA and Motoi WADA, Plasma Fusion Res. 8, 2402075 (2013).