Abstract
The plasma rotation velocity were measured in HL-1M with Doppler shifts of C III, C II, O II and Hα line by a SKD high resolution spectrometer. The effects of density, hydrogen pellet injection and carbon impurities injected by laser-blow-off on toroidal (Vφ) and poloidal (Vθ) rotation velocity have been observed. The Vθ measured from Hα line is only half of that from C II impurity line.
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