Fig. 1. Sketch of the experimental setup with the two-ramp pulse profile and the targets. Four laser beams irradiate the CHCl shell targets. A probe laser penetrates the hole of the Au cone and is reflected back by the shock into the VISAR diagnostics. The target self-emissions are measured by SOP.

Fig. 2. VISAR images for a rectangle pulse and two-ramp pulse shots. (a) The reference image of Target A without the laser shot. (b) The VISAR image for the rectangle pulse shot with Target A. (c) The VISAR image for the two-ramp pulse shot with Target B. The red line represents the temporal intensities of VISAR fringes extracted from the dashed rectangle box.

Fig. 3. SOP signals of the two-ramp shot. (a) Streaked image of emissions, with an illustration of the gold cone shown to indicate the corresponding locations. (b) Temporal FWHM of the emission source. (c) Lineout along the central axis of the CHCl shell in the SOP image.

Fig. 4. Temporal density distributions in the CHCl shell. (a), (b) Simulation of density distribution in the CHCl shell for rectangle pulse shots at t = 0 and t = 0.589 ns. (c)–(f) Simulation of density distribution in the CHCl shell for two-ramp pulse shots from t = 2.550 ns to t = 4.450 ns.

Fig. 5. The density along the target axis at different times for the two-ramp pulse shot.

Fig. 6. Converging shock positions versus the time in simulations. The blue dots are normalized shock positions and the red line is the linear fit.