Impact of the Upstream Plasma Parameters on the Spectroscopic Measurement in the GAMMA 10/PDX Divertor Simulation Experiments

抄録

Detailed results of spectral measurements in the gas injection performed in GAMMA 10/PDX divertor simulation experiments are presented. From the comparison of the emission intensity at the end-cell and plug/barrier-cell, impurity behavior along the magnetic field line is discussed in GAMMA 10/PDX. The emission intensity of Ar II is decreased due to the increase in the background plasma density and the end loss particle flux, which consequently suppresses the Ar particle transport towards the upstream region. The ECH in the plug-cell (EP-ECH) was applied to investigate the influence of the heating on the emission of injected impurities. Ar II intensity slightly increased EP-ECH. On the other hand, Kr II and Xe II decreased at the plug/barrier-cell.