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APPLIED PHYSICS LETTERS
Volume 92, Issue 24, Pages -Publisher
AIP Publishing
DOI: 10.1063/1.2945795
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The absolute laser conversion efficiency to K alpha-like inner shell x-rays (integrated from K alpha to K beta) is observed to be an order of magnitude higher in argon gas jets than in solid targets due to enhanced emission from higher ionization stages following ultrashort pulse laser irradiation. Particle-in-cell and spectral simulations indicate that these observations are consistent with K alpha emission from a warm Ar plasma subject to hot electron inner-shell ionization. These results demonstrate that gas jet targets are bright, high conversion efficiency, high repetition rate, debris-free multi-keV x-ray sources for spectrally resolved scattering and backlighting of rapidly evolving dense matter.
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