Temperature Dependence of Carbon Deposition on Tungsten

Since carbon deposition layers in tokamak devices will contain significant amount of tritium, it is important to study its formation mechanism. In this study, tungsten and molybdenum samples with a temperature gradient were irradiated by a mixed ion beam to precisely study temperature dependence of...

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Published inFusion science and technology Vol. 56; no. 2; pp. 1038 - 1042
Main Authors Yamawaki, A., Fukumoto, M., Soga, Y., Ohtsuka, Y., Ueda, Y., Ohya, K.
Format Journal Article
LanguageEnglish
Published La Grange Park, II Taylor & Francis 01.08.2009
American Nuclear Society
Subjects
Exact sciences and technology
Magnetic confinement and equilibrium
Physics
Physics of gases, plasmas and electric discharges
Physics of plasmas and electric discharges
Tokamaks
Temperature dependence
Mixing
Temperature gradients
Tritium
Tokamak devices
Carbon
Molybdenum
Ion beams
Temperature effects
Tungsten
Graphite
Formation mechanism
Erosion
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Summary:Since carbon deposition layers in tokamak devices will contain significant amount of tritium, it is important to study its formation mechanism. In this study, tungsten and molybdenum samples with a temperature gradient were irradiated by a mixed ion beam to precisely study temperature dependence of the deposition characteristics. For molybdenum, the temperature of the boundary between "deposition" and "nodeposition" is higher than W. This results roughly agree with the results by the material mixing model proposed by Kriegeretal [K. Krieger. J. Roth. J. of Nucl. Mater. 290-293 (2003) 107.]. Erosion yield of C deposition layer in our experimental conditions was almost equal or less than the yield by Rothmodel [J. Roth, C. Garcia-Rosales, Nucl. Fusion 36 (1996) 1647] for graphite.
ISSN:1536-1055
1943-7641
DOI:10.13182/FST09-A9048