Abstract
A CO 2 collective scattering system has been developed to measure medium and high- k density fluctuation on HT-7 tokamak. Energy confinement and high- k density fluctuation are studied in ohmic discharges. The saturation of confinement was observed at approximately n ¯ e > 2.5 × 10 19 m −3 . For k θ = 23 cm −1 turbulence, it is found that fluctuation levels have great increase for n ¯ e > 2.5 × 10 19 m −3 , and simultaneously a high frequency turbulence feature appear in the frequency spectra. For k θ = 14 cm −1 turbulence, it is observed that fluctuation levels have no changes in uncertainties and the spectra are similar at all discharges in this experiment.
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