Abstract
More than 70% of the total plasma current is sustained by thebootstrap current and current drive during the synergy of lower hybridcurrent driving (LHCD) and ion Berstein wave (IBW) heating on the HT-7tokamak. The lower hybrid non-inductive current source is off-axis andwell localized, and more than 35% bootstrap current plasma has beenobtained. The IBW in controlling electron pressure profile can beintegrated into the LHCD target plasma. The largest steep gradient ofthe electron pressure profile in the region ρ~0.5–0.7 mostlycomes from the electron temperature profile, which may induce the largefraction bootstrap current. The large off-axis bootstrap current canhelp to create negative magnetic shear, and the good plasma confinementis achieved.
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