Electrostatic probe measurements of low-density medium-pressure magneto-plasmas

Publisher Website
Google Scholar
Abstract
The influence of secondary electron emission from a probe surface on the probe diagnostics are studied in a medium-pressure low-density plasma with a weak magnetic field. Both electron and ion saturation currents are used to obtain Ne, and the results are compared with microwave measurements. The increase of Ii due to electron emission occurs; this prevents the accurate determination of Ne in the same manner as that reported in a plasma without a magnetic field. Even though the uncertainty in determining Ne due to the effect of emission decreases with increasing B, Iis is not always suitable for Ne determination. On the other hand, Ne determined from Ies corrected for magnetic field effects agrees with microwave measurements within 50%.