Control of Radial Potential Profile by Biased Segmented Endplates in an ECR Plasma

抄録

A radial potential profile is successfully changed flom hill- to well-shaped by biasing segmented endplates in a strongly magnetized plasma produced by the electron-cyclotron-resonance. The potential profile is settled down to hold the condition where there is no net electric current to the wall surrounding the plasma. There appears a radial electric current due to the non-ambipolar radial ion loss, balanced with an axial electron current determined by the sheath potential drop in front of the endplates. The radial ion loss is observed to be remarkably enhanced by increasing the outward radial electric field.