Plasma Spectral Measurements in the D-Module of the GAMMA 10/PDX End-Cell

In this paper, results of spectral measurement in the end-cell of the GAMMA 10/PDX are described. A spectral measurement system consisting of two spectrometers was developed in order to measure the detailed radiation behavior in D-module. Firstly, angular dependence of the V-shaped target plate on the spatial distribution of the Hα radiance was investigated. It is found that the spectral distribution in Hα intensity along the axial direction is affected by the angle of the target plate. Next, in the experiment with H2 and Ar gas injection, primary 17 line spectra of Ar I were identified and the radiation loss from Ar neutrals was also evaluated from intensity of spectra. A correlation between the power of radiation loss and the electron temperature in D-module are recognized. The correlation between radiation power and electron temperature is also discussed from the view point of radiation cooling.