Experimental evidence of radiative collapse in hybrid X pinches from time-resolved x-ray spectroscopy of Ti plasma.

Abstract

A complex study of Ti hybrid X-pinch (HXP) radiation, including spectroscopic studies with temporal and spatial resolutions, source size measurements, and relative intensities of the spectral lines, was carried out. The time-resolved spectra recorded by the x-ray streak camera were calibrated in intensity using the time-integrated spectra recorded on imaging plates with a linear response. A numerical modeling using the PrismSPECT program was used to estimate the parameters of Ti HXP plasma and their changes in time. The radiation source size determined by point-projection radiography was taken into account in the spectral analysis. The results show that radiation collapse is most likely the mechanism responsible for the formation of hot spots in X pinches.