We report parametric studies of an lsquo;lsquo;appliedhyphen;Bthgr;rsquo;rsquo; magnetically insulated ion diode, and the properties of the ion beam obtained from it. The typically 250hyphen;keV ion beam extracted from this annular diode is focused by the diode field to a current density of up to 800 A/cm2on axis 20 cm from the diode. Anomalously rapid dispersion of the beam beyond the focal region in vacuum is eliminated by puffing gas into the drift chamber.
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