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

Motoshi GOTO and Shigeru MORITA

National Institute for Fusion Science, Toki 509-5292, Japan

(Received 6 February 2009 / Accepted 22 May 2009 / Published 26 March 2010)

Abstract

Helium-like argon spectra are measured for plasmas in the Large Helical Device (LHD). The electron temperature T_e derived from the intensity ratio of a dielectronic satellite line (1 s² 2p ²P_1/2 - 1s2p^{2 2}D_3/2) to the resonance line (1 s^{2 1}S₀ - 1s2p ¹P₁) is consistent with the central T_e measured with the Thomson scattering method when the electron density n_e has a peaked profile. The ion temperature T_i is simultaneously determined from the Doppler broadening width of the resonance line and an establishment of thermal equilibrium between electrons and ions, i.e., T_i = T_e, due to increase of n_e is experimentally confirmed. The density ratio of lithium-like ion to helium-like ion is determined from fitting of the entire spectrum.

Copyright (c) 2010 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

X-ray spectroscopy, helium-like argon, dielectronic satellite line, electron temperature measurement, ion temperature measurement

DOI: 10.1585/pfr.5.S1040

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References

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This paper may be cited as follows:

Motoshi GOTO and Shigeru MORITA, Plasma Fusion Res. 5, S1040 (2010).