Abstract
H-mode like discharges have been achieved by electrode biasing on the HL-1 tokamak. During the biasing period, the energy confinement time τ E increased and density fluctuations were suppressed. It is shown that the fluctuation spectrum with biasing is very different from the unbiased case. The auto-power spectrum value of the density fluctuation decreased, and the fluctuation power had a different value as a function of the biased voltage variation.
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