Alexander L. Velikovich;Nicholas D. Ouart;Arati Dasgupta;John L. Giuliani;Varun Tangri;Adam J. Harvey-Thompson;Marc-Andre Schaeuble;Jens Schwarz;Clayton E. Myers;David J. Ampleford;Roger A. Vesey;Brent Jones
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引用次数: 0
Abstract
The use of the recombination continuum for X-ray radiation production in Z-pinches is discussed as an option for generating high yields in the warm photon energy range,
$\hslash \omega \gt 10$
keV. The free-bound direct-recombination continuum emission is an inherently weaker radiation production mechanism than the resonant-line emission. However, it is challenging, if at all possible, to heat stagnated Z-pinch plasmas with atomic numbers
$Z_{A} \gt 36$
to temperatures above ~10 keV needed for efficient K-shell line emission in the warm photon energy range. As the atomic number of the load material increases from
$Z_{A} = 18$
(argon) to
$Z_{A} = 26$
and 29 (iron and copper, respectively), the scaling parameter determining the ratio of the recombination continuum to hydrogen-like line K-shell yield increases by a factor of 2–3. This indicates a possibility of using wire-array Z-pinch implosions on next-generation pulsed-power facilities (NGPPs) to produce significant continuum yields in warm photons. Such an option is feasible, provided that stripping substantial fractions of iron and copper ions at stagnation to an H-like state can be demonstrated. We analyze K-shell continuum yields measured in recent Z experiments with argon double-shell gas-puff and stainless-steel nested wire-array loads, with a view of scaling present-day results to higher driver currents.
期刊介绍:
The scope covers all aspects of the theory and application of plasma science. It includes the following areas: magnetohydrodynamics; thermionics and plasma diodes; basic plasma phenomena; gaseous electronics; microwave/plasma interaction; electron, ion, and plasma sources; space plasmas; intense electron and ion beams; laser-plasma interactions; plasma diagnostics; plasma chemistry and processing; solid-state plasmas; plasma heating; plasma for controlled fusion research; high energy density plasmas; industrial/commercial applications of plasma physics; plasma waves and instabilities; and high power microwave and submillimeter wave generation.