Abstract
A laser-induced fluorescence (LIF) spectroscopy has been applied to an electron cyclotron resonance plasma. The absolute azimuthal flow velocity has been determined by the Doppler-shifted LIF spectrum and compared with that measured with a directional Langmuir probe (DLP) and the E × B drift velocity, respectively. The velocity profiles obtained with the three different methods show good agreement. The validity of LIF spectroscopy as a tool of local and absolute flow velocity measurement has been confirmed.
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