Abstract
We present experimental deta on the multiple ionization of refractory metal ions formed in the vacuum-arc discharge plasma, which is achieved by injecting plasma into a magnetic trap and additionally heating it by high-power microwave radiation in the millimeter range. An increase in the high-power microwave source (gyrotron) frequency from 37.5 to 75 GHz allowed plasma of greater density to be heated to a sufficiently high electron temperature ensuring the multiple ionization of trapped particles. In the case of platinum, the microwave heating led to an increase in the average ion charge from 2 to 7, while the maximum platinum ion charge reached 10 and the total ion beam current amounted to 300 mA.
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