Abstract
Abstract The width of energy spectra and the most probable energy of mercury ions extracted from a duoplasmatron increase suddenly beyond a critical value of the discharge current. At the same time, a large proportion of doubly-charged ions may be found in the beam, even at very low arc voltages. The presence of oscillations in the discharge can explain these phenomena. Another experiment shows the drastic influence of the remaining magnetic stray field in front of the anode on the optical properties of the beam, when a large plasma expansion cup is used.
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