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Characteristics of Magnetized Coaxial Plasma Gun for Simulation Experiment of Thermal Transient Events in ITER

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5 Author(s)
Kikuchi, Y. ; Dept. of Electr. Eng. & Comput. Sci., Univ. of Hyogo, Himeji, Japan ; Nakanishi, R. ; Nakatsuka, M. ; Fukumoto, N.
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A compact-sized magnetized coaxial plasma gun (MCPG) with a single discharge stage is developed in order to simulate transient heat loads such as type I edge-localized modes (ELMs) in ITER. The MCPG produces hydrogen plasmas with an electron density of 1- 4 ?? 1021 m-3, an ion energy of 15 eV and a pulsewidth of 0.5 ms. It is found that the absorbed energy density measured by a calorimeter reaches 0.9 MJ/m2 which is comparable with a transient heat load of type I ELMs expected in ITER. Erosion of tungsten due to the plasma irradiation produced by the MCPG is confirmed only at the edge parts of the specimen in this experiment.

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Plasma Science, IEEE Transactions on  (Volume:38 ,  Issue: 3 )