Fig. 1. Two types of targets and schematic diagram of the experimental setups. (a) The Type I target. (b) The Type II shot and the schematic diagram of the experimental setups. The silicon plate is set at the target chamber center (TCC), and two driven laser beams are focused on it. A crystal spectrometer is used to record the spectrum of plasma.

Fig. 2. Black and gray lines are the experimental spectra of two Type I shots. Red line is the simulation results (Case A), where and . Blue line is the unbroadened theoretical line.

Fig. 3. Black and gray lines are the experimental spectra of two Type II shots. Red line is the simulation results (Case B), where and .

Fig. 4. Black line is the experimental spectrum of repeated Type II targets in 2017. Red line is the simulation results (Case C), where and .

Fig. 5. (a) and (b) are the interferograms of Type I and Type II shots. (c) and (d) are the electron density distribution deduced by Abel inversing of (a) and (b).

Fig. 6. The and values. Every line has same electron density, which spans from to exponentially, and the line ratios are plotted as a function of electron temperature.

Fig. 7. The (red) and (black) values. Every line has same electron temperature, which spans from 100 eV to 500 eV incrementally, and the line ratios are plotted as a function of electron density.

Fig. 8. The solid scatters are the experimental and values. The open scatters are the and values of the three theoretical cases.