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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.