  We demonstrated a polarization-resolved high resolution spectroscopy of a
visible emission line of highly charged tungsten ions ({\lambda}0 = 668.899 nm,
Shinohara et al Phys. Scr. 90 125402) for the large helical device (LHD)
plasma, where the tungsten ions were introduced by a pellet injection. Its
spectral profile shows broadening and polarization dependence, which are
attributed to the Doppler and Zeeman effects, respectively. The tungsten ion
temperature was evaluated for the first time from the broadening of visible the
emission line, with its emission location determined by the Abel inversion of
the chord-integrated emission intensities observed with multiple chords. The
tungsten ion temperature was found to be close to the helium-like argon ion
temperature, which is used as an ion temperature monitor in LHD
