Study on carbon coating films produced in Heliotron-E

Minagawa, Hideki; Hino, Tomoaki; Yamashina, Toshiro; Watanabe, Mikio; Noda, N.; Mizuuchi, T.; Motojima, O.; Iiyoshi, A.; Uo, K.

doi:10.1016/0022-3115(89)90362-0

Cited by 6 publications

(3 citation statements)

References 16 publications

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“…The major content was carbon (see Table 2). Raman spectrum of flake-like dust is shown in Glow discharge cleaning and pulsed discharge cleaning Hydrogen pressure in divertor region 0.01-0.5 Pa Wall temperature =523 K a a It was assumed that the divertor tiles were heated to a temperature above 2000 K. The spectrum of carbon dust sample prepared at 300 K had a single peak at around 1520 cm À1 , which is a typical peak for hydrogenated amorphous carbon [13]. As the substrate temperature was increased up to 850 K, two peaks appeared at around 1580 cm À1 (G-band) and 1360 cm À1 (D-band).…”

Section: Resultsmentioning

confidence: 99%

Hydrogen retention of carbon dust produced in JT-60

Yoshida

Yamauchi

Hirohata

et al. 2005

Journal of Nuclear Materials

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Section: Resultsmentioning

confidence: 99%

Hydrogen retention of carbon dust produced in JT-60

Yoshida

Yamauchi

Hirohata

et al. 2005

Journal of Nuclear Materials

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“…This spectrum often appears in the carbon film produced by plasma chemical vapor deposition, (PCVD), and is considered to be caused by the amorphous carbon. 8) Namely, the carbon structure becomes more amorphous with decrease in the substrate temperature. When compared with co-deposited carbon dust, co-deposited tungsten mixed carbon dust was observed to be more amorphous, since the spectrum was broader.…”

Section: Resultsmentioning

confidence: 99%

Deuterium Retention in Tungsten Mixed Carbon Dust

Yoshida

Hino

Akiba³

et al. 2005

Mater. Trans.

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Tungsten mixed carbon dust was prepared using a deuterium arc plasma discharge with tungsten and carbon electrodes. The concentration of tungsten with an atomic ratio of W/(C+W) was in the range from 0 to 0.3. The Raman spectra showed that the crystal structure of carbon became amorphous with the addition of tungsten, although two broad peaks owing to graphite and defective graphite appeared. The structure also became amorphous when the substrate temperature decreased. The retained deuterium desorbed mainly at approximately 900 K, which corresponds to the desorption of deuterium trapped by carbon atoms. Namely, most of the co-deposited deuterium is retained in the carbon atoms. The amount of retained deuterium increased with an increase in the tungsten concentration. The amount of retained deuterium was larger than that of the co-deposited carbon dust which was similarly prepared in the arc plasma discharge with only carbon electrodes. The increase in deuterium retention is due to the enhanced amorphous structure by the mixture of tungsten.

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“…The atomic ratio, C/W, in this C-W dust was approximately 70/30. The spectrum of carbon dust prepared at 300 K had a single peak at around 1520 cm À1 , which is a typical peak for hydrogenated amorphous carbon [17]. As the substrate temperature was increased, two peaks appeared at about 1580 cm À1 (G-band) and 1360 cm À1 (Dband).…”

Section: Structure Of Carbon Dust and C-w Dustmentioning

confidence: 97%