Temperature and x-ray intensity scaling in KrF laser plasma interaction

Abstract

Experimental measurements are presented of space and time integrated x-ray emission from aluminum plasma produced by 2 ns (full width at half-maximum), 268 nm Raman compressed KrF laser pulses. A single temperature spectrum was measured giving temperatures of 75–440 eV over the range of intensities 9×1011–2×1013 W/cm2. This scaling agrees well with a simple self-regulating model. Conversion of laser energy into x rays above 1 keV energy was found to scale as I2.37L reaching 0.35% at 3.5×1013 W/cm2.