关键词: 密度调制, 超声分子束注入, 粒子输运, 对流速度

Abstract:

The plasma particle transport is studied by two different ways of density modulation, gas-puffing and SMBI. The particle diffusion coefficient (D) and convection velocity (v) are obtained by solving the particle balance equation with the finite difference method and Nagashima’s matrix technique, and the relation between the particle transport coefficients and the line-average-density is investigated in the routine ohmic discharge of HL-2A tokamak. Experimental reults show that the direction of particle convection velocity is always inward in the center, the particle transport coefficients (D and v) are larger for the lower line-average-density, and the particle transport coefficients become smaller when the line-average-density is higher.

Key words: Density modulation, Supersonic molecule beam injection(SMBI), Particle transport, Convection velocity