Abstract
The ion energy distribution in an orbitron device has been measured by means of a retarding field analyzer. The influence of the main geometric and electric parameters of the device on the ion spectra is reported here. The observed distributions show that, because of the electrostatic field configuration, the ionizing efficiency is much smaller near the reflector plates than in the central part of the device. In all cases the ion energy distribution is continuous and broad with a single maximum. Implications of the electron distribution in the orbitron are discussed. Particularly, it results from these investigations that the radial electron density distribution is a monotonically decreasing function of the radial position in the orbitron. These results are interpreted in terms of electron trajectories.
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