Abstract
We have investigated the properties of hotspots formed in low energy Plasma Focus discharges operating in Hydrogen‐Argon mixtures, at 140 kA current level. The results show that best conditions for reproducible and localized hotspot formation are obtained by adjusting the base pressure in such a way that the mass load allows the time of first radial collapse to coincide with peak current. When the Plasma Focus is operated with 20% Argon content, rather uniform hotspots, of 115 μm characteristic size and 300 eV characteristic temperature, are produced with a better than 80% reproducibility in their axial localization. A significant fraction of the radiation is emitted in the 3.2 to 3.88 keV region, corresponding to Kα emission from highly ionized Argon.
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