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Helium-like argon spectra are measured for plasmas in the Large Helical Device (LHD). The electron temperature Te derived from the intensity ratio of a dielectronic satellite line (1 s2 2p 2P1/2  - 1s2p2 2D3/2) to the resonance line (1 s2 1S0 - 1s2p 1P1) is consistent with the central Te measured with the Thomson scattering method when the electron density ne has a peaked profile. The ion temperature Ti is simultaneously determined from the Doppler broadening width of the resonance line and an establishment of thermal equilibrium between electrons and ions, i.e., Ti = Te, due to increase of ne is experimentally confirmed. The density ratio of lithium-like ion to helium-like ion is determined from fitting of the entire spectrum

Simultaneous Measurement of Electron and Ion Temperatures with Helium-like Argon X-Ray Spectrum