Control of electron temperature and space potential gradients by superposition of thermionic electrons on electron cyclotron resonance plasmas

Abstract

An electron temperature gradient (ETG) is formed perpendicular to the magnetic field lines by superimposing lowerature thermionic electrons emitted from a tungsten hot plate upon higherature electrons of an electron cyclotron resonance plasma, which pass through two different-shaped mesh grids. The radial profile of the plasma space potential can be controlled independent of the ETG by changing the bias voltages of the hot plate. © 2010 American Institute of Physics.