Spectroscopic comparison method for determining the electron temperature of high-temperature plasmas of heavy element

Abstract

For further development of the comparison method, the X-ray spectra of laser plasmas of light (Si, S, Cl, K, Ca, Ti) and heavy (Mo, W) elements are studied. Plasma is produced by focusing nanosecond laser radiation (λ = 0.53 μm, E L = 5 J, τ = 2 ns) onto massive solid targets. The spectra are recorded using two focusing crystal spectrometers in the wavelength range λ = 2 – 11 Å. A detailed analysis of H- and He-like ion spectra is performed to determine the dependence of the electron temperature (T e = 500 – 800 eV) on the energy of laser pulses (E L = 0.5 – 5 J). Recommendations are given for measuring T e from the spectra of light elements with maximum accuracy. The comparison method is employed to estimate the electron temperature of the plasmas of heavy elements (Mo, W), whose X-ray spectra are complex in structure.