Effects of the extra magnetic perturbation field on cylindrical plasmas

The turbulence evolution, the poloidal mode number (m), the radial electric field (Er), and the radial particle flux (Γr) induced by an extra magnetic perturbation (EMP) field are studied in a linear plasma magnetic field configuration on the Zheda Plasma Experimental Device. The experimental data are obtained by a quadruple Langmuir probe (QLP) and a high-speed imaging system. The experimental results and the analysis show that in Bz rising without EMP, the density gradient increases, and the temperature gradient almost does not change at r=3.6–4 cm, the turbulence frequency slightly decreases, the m remains 3–5, and the Γr decreases with the Er shear rising. While, in Bz rising with EMP, the plasma balance status was broken once the EMP was applied, the plasma was pressed, and the density gradient increased, especially the plasma response (turbulence evolution, the m, the Er, and the Γr) to the EMP was affected in a local plasma rather than a global plasma.