Observation of ion-cyclotron-frequency mode conversion plasma rotation on HT-7

In this paper, we present a study on D-H (Li-7) plasmas with moderate hydrogen concentration (similar to 15%) on the HT-7 tokamak. Enhanced density fluctuation induced by ion cyclotron range of frequencies (ICRF) at the centre of the plasma is observed by a continuous wave CO2 (lambda = 10.6 mu m) collective scattering system. At the same time, the Doppler shift V-D due to (E) over right arrow x (B) over right arrow plasma rotation in the mode-converted ICRF D-H (Li-7) plasmas is observed experimentally for the first time on the HT-7 tokamak, and the Doppler shift V-D is approximately linear versus the change in plasma stored energy Delta W.