Spatial Structure of Plasma and Neutral particles near Tungsten Target in the Compact PWI Simulator APSEDAS

摘要

It is necessary to examine spatial structure of plasma and neutral particles near plasma facing material for understanding plasma dynamic and recycling phenomena in divertor region of magnetically plasma confinement device. In the compact PWI simulator APSEDAS, cylindrical plasma is irradiated into the tungsten target. The ratio of helium visible lines at lambda velence 667.8 nm and at lambda velence 728.1 nm is measured to estimate electron density near tungsten target. H(alpha) intensity is also obtained from measurement using CCD camera. It is found that both the electron density and the H(alpha) intensity show similar distribution in which both parameters decrease toward the tungsten target. Based on the Monte Carlo simulation, the H(alpha) intensity due to the neutral particle from filling gas source sufficiently shows similar tendency with that captured by CCD camera and the electron density.