Measurement of radiation-heated aluminum Ka absorption spectra

The Ka absorption spectrum is one of the important methods to determine the temperature of radiation-produced plasmas. The CH-sandwiched aluminum foil, deposited on the back surface of the gold foil, was heated by the X-ray radiation from the laser-irradiated gold foil on the Xingguang Ⅱ laser facility. The Ka absorption spectra for various thickness aluminum samples were measured with the PET crystal spectrometer. Obvious Ka absorption lines from He-like to F-like Al ions were observed. As comparison, the aluminum Ka absorption spectra at different temperatures and densities were also calculated using the detailed term accounting(DTA) model. The simulated spectra are in good agreement with the experimental ones, which can be applied to determine the sample temperature in opacity experime