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Suppression of Carbon Dust Formation by Nitrogen Injection into Hydrogen Plasmas in Detached Plasma Conditions

Masaaki KYO, Yuji TAKEGUCHI, Yoshihiko UESUGI, Yasunori TANAKA and Suguru MASUZAKI¹⁾

Division of Electrical and Computer Science, Kanazawa University, Kanazawa 920-1192, Japan

1)

National Institute for Fusion Science, Toki 509-5292, Japan

(Received 30 September 2009 / Accepted 20 November 2009 / Published 25 January 2010)

Abstract

Chemical erosion of carbon materials and dust formation in low-temperature and neutral particle-dominated plasmas were investigated using high-pressure inductively coupled plasmas. Experiments were performed with Ar/H₂/N₂ mixture plasma irradiation to graphite targets. The addition of just a few percent of nitrogen gas to hydrogen led to significant suppression of carbon dust formation on the graphite target. From optical emission spectroscopy, CN band spectra were observed strongly in Ar/H₂/N₂ plasmas with a decrease of CH and C₂ band emission intensity. These results showed that CN bond formation, which caused chemical erosion of carbon by producing volatile CN, HCN, and C₂N₂ particles, might have been a key suppression mechanism of the carbon particle aggregation.

Copyright (c) 2010 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

carbon dust formation, plasma-surface interaction, chemical sputtering, graphite material

DOI: 10.1585/pfr.5.004

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References

• [1] J. Winter and G. Gebauer, J. Nucl. Mater. 226-229, 228 (1999).
• [2] J.P. Sharpe et al., Fusion Eng. Des. 63, 153 (2002).
• [3] J.P. Sharpe et al., J. Nucl. Mater. 337, 1000 (2005).
• [4] J.P. Sharpe et al., J. Nucl. Mater. 313-316, 455 (2003).
• [5] C. Arnas et al., J. Nucl. Mater. 353, 80 (2006).
• [6] Y. Tanaka et al., Appl. Phys. Lett. 89, 031501 (2006).
• [7] Y. Takeguchi et al., Plasma Fusion Res. 3, 25 (2008).
• [8] P. Sundelin et al., J. Nucl. Mater. 390-391, 647 (2009).
• [9] J.A. Ferreira et al., J. Nucl. Mater. 390-391, 593 (2009).
• [10] W. Jacob et al., Appl. Phys. Lett. 86, 204103 (2005).
• [11] J. Hong et al., Diamond Relat. Mater. 9, 573 (2000).
• [12] S. Grigull et al., J. Nucl. Mater. 275, 158 (1999).

This paper may be cited as follows:

Masaaki KYO, Yuji TAKEGUCHI, Yoshihiko UESUGI, Yasunori TANAKA and Suguru MASUZAKI, Plasma Fusion Res. 5, 004 (2010).