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Abstract
It is shown that the electrons in a magnetic ion source can experience up to 48 oscillations in heliumgas before being caught by the anode cylinder. This corresponds with a mean pathlength of 1200 cm, and gives rise to electron and positive ion densities in the discharge of the order of 10 10 per cm 3. The degree of ionisation is 0,1%. The influence of the pressure on the ion-production mechanism as well as the economy of the source are discussed. From 50 to 80 percent of the gas is used effectively for ion output of the source, and we need only 0,05 Watt energy input per μA ion current on the target. A discussion of the ion extraction mechanism explains our high ion currents in comparison with other types of ion sources.
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