Edge turbulent transport with lower hybrid current drive in the Hefei Tokamak-7

The turbulence-induced particle transport and heat transport in the edge of a lower hybrid current drive (LHCD) was measured using Langmuir probe. The fluctuations of plasma density, plasma temperature, and poloidal electric field in the boundary plasmas were reduced, significantly decreasing the the electrostatic turbulence-induced particle flux and heat flux after the application of LHCD. The reductions of transport suggested that the egde plasma confinement was improved by the lower hybrid wave (LHW). It was also shown that the differences between turbulent convective and conductive fluxes depended on such discrepancy between normalized density fluctuation and temperature fluctuation.