Development of Time-resolved X-ray absorption spectroscopy set-up for warm dense matter with laser-plasma X-ray source

Abstract

Warm Dense Matter (WDM) refers states between low-temperature high-density solid and high-temperature low-density plasmas. Such exotic conditions could be created in the laboratory by isochoric heating of thin solid target with intense femtosecond laser pulse. In order to measure electronic structure and thermal properties of transient WDM, time-resolved x-ray absorption spectroscopy setup utilizing laser-plasma x-ray source will be developed. The x-ray beamline will be consist of a series of x-ray collection and focusing optics (toroidal mirrors and polycapillary lenses), pump-probe stage, and a high-resolution x-ray spectrometer. X-ray absorption spectra for various targets heated with femtosecond laser pulse would be measured with a few picosecond resolutions, and they will be applied to investigate thermal properties of WDM.