Abstract
The electron temperature and electron density of a steady state helium plasma produced by a hollow cathode arc discharge have been measured with the aid of Thomson scattering as functions of the radial distance to the plasma axis. Electron densities in the range of 1*1019 to 4*1019 m-3 and electron temperatures 0.5*105 to 2.5*105K were determined with an accuracy of 5% in both. The observed Thomson spectra indicate a Maxwell-Boltzmann velocity distribution of the electrons. The Thomson scattering measurements have been spatially extended by probe measurements.
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