Abstract
By applying ion Bernstein wave (IBW) heating into the lower hybridcurrent drive (LHCD) plasma, improved confinements have been obtainedin the HT-7 tokamak. The central electron temperature was doubled andthe storage energy was increased significantly. The core electrondensity and temperature were broadened and their profiles near the edgewere steepened. A transport barrier has been formed in the vicinity ofthe limiter radial location. An enhanced shear in poloidal phasevelocity was found in the same region with reduction of the fluctuationlevels and the coherences between fluctuations. The results suggestthat the improved confinement in the IBW and LHCD plasma is at leastpartially due to the modification of shear in poloidal velocity andthen the suppression of fluctuations and fluctuation induced fluxes viade-correlation effect.
Published Version
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