Y. Kikuchi, R. Nakanishi, M. Nakatsuka, N. Fukumoto, M. Nagata
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Simulation experiment of thermal transient events in ITER by use of magneti zed coaxial plasma gun
A compact-sized MCPG with a single discharge stage is developed so as to simulate transient heat loads such as type I ELMs in ITER. The MCPG produces H2 plasma with the electron density of 1-4×1021 m−3, the ion energy of 15 eV and the pulse width of 0.5 ms. It is found that the absorbed energy density measured by a calorimeter reaches 0.9 MJ/m2 which is comparable to transient heat load of type I ELMs expected in ITER. Erosion of tungsten due to the plasma irradiation produced by the MCPG was confirmed only at the edge parts of the specimen.
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