Abstract
The effect of the C-coating has been demonstrated for tokamak plasmas with high power heating. In situ carbon coating has been made with a glow discharge in a methane/hydrogen mixture gas. Without C-coating, iron contamination has been so severe in megawatts of ICRF heating that the total radiation loss exceeds the rf-heating power, and the electron temperature, after once heating up, then decreases continuously during the latter half of 55 ms rf pulse. With C-coating, the radiation loss is reduced to be one fifth of the rf power and the electron temperature Te becomes stationary at the end of the rf pulse. As a result of this change in Te, the total stored energy increases more than the one without C-coating.
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