Abstract
We carried out spectroscopic measurements of extreme ultraviolet (EUV) emissions from xenon (Xe) plasmas generated in the Compact Helical System (CHS) by a grazing incidence spectrometer with a spectral resolution of 0.05 nm. Spatial pro les of the electron density and temperature of the plasmas have been measured by laser Thomson scattering diagnostic system. A remarkable variation in spectral features by different electron temperatures was observed, and was attributed to the difference in dominant charge states of Xe ions in the plasma.
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