High K-alpha X-ray Conversion Efficiency From Extended Source Gas Jet Targets

摘要

The absolute laser conversion efficiency to K-alpha-like inner shell x-rays (integrated from K-alpha to K-alpha) 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 ultra short pulse laser irradiation. Excluding the higher ionization stages, the conversion efficiency to near-cold K-alpha is the same in gas jets as in solid targets. 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.