Observation of x-ray emission differences heating by high power laser and x-ray pulses

Au x-ray transmission grating and an x-ray streak camera are combined to provide a time-resolved diagnostic of a subkilovolt x-ray spectrum, which gives time resolution of about 30 ps and moderate spectral resolution of 0.4-0.5 nm. Two types of cavity targets representing laser heating area and radiation heating are designed for experiment on LF-12 laser facility, and the laser pulses happened to be temporal-modulated; thus, are in favor of temporal characteristic experiment. Spectral and temporal characteristics are investigated by comparing the time-resolved spectra of these two kinds of targets. Experimental results show that the x-ray pulse of the laser heating area follows that of the incident laser, while the ex-ray pulse of the radiation heating area is significantly smoothed and changes with that of the original incident laser much less obviously. It is also indicated that the instantaneous spectrum of radiation heating area, as compared with the laser heating area at the corresponding moment is softer, has a smaller proportion of band emission and is more closely related to Planck distribution