Measurement of time-resolved electron temperature of plasmas for Shenguang Ⅱ hohlraum

Time-resolved spectra of highly ionized Cr and Ti tracers， which are buried in the inner wall of golden hohlraum， are measured by the streaked crystal spectrometer on the Shenguang Ⅱ laser facility. The collisional radiative model is adopted for non-LTE (local thermodynamic equilibrium) population calculations, and configuration-averaged rate coefficients are obtained based on the first-order perturbation theory. Hartree-Fock Slater self-consistent field method is used to calculate electron wavefunctions. The isoelectronic line-ratio of He-α for Cr and Ti tracers is derived in the electron density range of 1019～1022 cm-3. The evolution of time-resolved electron temperature in hohlraum in the process of laser-plasma interaction is deduced by isoelectronic X-ray spectroscopy