Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1567491 | Journal of Nuclear Materials | 2009 | 5 Pages |
New results are shown on carbon deposition and mixed layer formation on tungsten surfaces in TEXTOR test limiter experiments by varying surface conditions such as surface roughness (Ra: 10 nm–1 μm), temperature (300–900 °C), and initial surface carbon concentration (0–60%). It is found that surface roughness significantly affected C deposition for both W and graphite substrates such as increase in the C deposition and extension of the C deposition area. Not only the surface roughness parameter Ra but also detailed surface morphology closely relate to C deposition on tungsten. Carbon deposition hardly occurred at least above ∼520 °C on tungsten under TEXTOR edge plasma conditions. Carbon behavior on tungsten at 770–930 °C depends on the incident carbon ion energy. Although tungsten and carbon mixing layers affected C deposition, their effect is less than the roughness effect.