Improved confinement by edge multi-pulse turbulent heating on HT-6M tokamak

In the recent experiment on HT-6M tokamak, an improved ohmic confinement phase has been observed after application of the edge multi-pulse turbulent heating, and variance of plasma current ΔI_P/I_P is about 14-20%. The improved edge plasma confinement phase is characterized by (a) increased average electron density N̄_e and electron temperature T_e ; (b) reduced H_a radiation from the edge; (c) steeper density and temperature profiles at the edge; (d) a more negative radial electric field over a region of ∼ 5 mm deep inside the limiter; (c) a deeper electrostatic potential well at the edge; (f) reduced magnetic fluctuations at the edge.