The Duoplasmatron Formation of He++ Ions

The experiments concerning the He++ formation with a duoplasmatron are presented. The measurements for choosing the suitable parameters of the source have been made with a test setup installed immediately after extraction electrode of the source. A method for estimation of the partial H2+ and He++ currents is proposed. The mass analysis has been made alternate for hydrogen and helium in the source and for a mixture of both in the expansion cup. With equal partial pressures of helium and hydrogen inside the plasma cup, the analyzed He+ peak does not change, the H+ peak increases by 30% and the (He++ + H2+) by 75%.