This article is cited in 3 papers

Interaction of laser radiation with matter. Laser plasma

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

A. P. Shevel'ko

P. N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow

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.

Keywords: diagnostics of high-temperature plasma, X-ray spectroscopy, multiply charged ions, laser-produced plasma, X-ray spectrometers.

Received: 12.03.2021

 English version: Quantum Electronics, 2021, 51:5, 453–458

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