Uniform-fill nozzles for long-implosion-time prs experiments

We have developed uniform-fill nozzles for long-implosion PRS experiments to produce argon K-shell x-rays (photon energy > 3.1 keV). With a 7 cm diameter nozzle, which is appropriate for a 200 ns driver, we have achieved a stable implosion at 180 ns and 4 MA with peak argon K-shell yields exceeding 15 kJ. As previously seen with short (∼100 ns) implosion times, the K-shell yield scales as the fourth power of peak current, I
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. Limited testing with a 10 cm nozzle, which is appropriate for a >250 ns driver, has also achieved a stable implosion.