Absorption Spectra Measurements Of The X-Ray Radiation Heated Sio2 Aerogel Plasma In "Dog-Bone" Targets Irradiated By High Power Laser Pulses

We studied the opacity effect of the SiO2 aerogel plasma heated by x-ray radiation produced by high power laser pulses irradiating the inner surface of golden "dog-bone" targets. The PET crystal spectrometer was used to measure the absorption spectra of the plasmas in the range from 6.4 angstrom to 7.4 angstrom, among which the line emissions involving the K shell of Si ions from He-like to neutral atom were located. The experimental results were analyzed with Detailed-Level-Accounting method. As the plasma temperature increased, the characteristic lines of highly ionized ions gradually dominated the absorption spectrum.