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It is important to obtain spatial structure of plasma and neutral particles near plasma facing material in order to understand plasma dynamic and recycling phenomena in divertor region of magnetically... plasma confinement device. In the compact PWI simulator APSEDAS, the ratio of helium visible lines at 667.8 nm and at 728.1 nm is measured to estimate electron density near tungsten target. H_α intensity is also obtained from measurement using CCD camera. It is found that both the electron density and the H_α intensity show similar distribution in which both parameters decrease toward the tungsten target. Based on the Monte Carlo simulation, the H_α intensity due to the neutral particle from filling gas source sufficiently shows similar tendency with that captured by CCD camera and the electron density.show more
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137_p147