Fig. S3.

Trapping and violent turbulent mixing of the argon gas and the carbon in the jets when the two jets collide. (Upper) Close-up images of the interaction region at 600, 800, and 1,500 ns, showing the logarithm of the density (top) and the target material fraction (bottom). (Lower) Close-up images of the interaction region at the same three times, showing the radial velocity $v_r$ perpendicular to the axes of the jets (top) and the velocity $v_z$ parallel to the axes of the jets (bottom). The images show that the mixing between the argon gas and the jets is thorough and persists for $\sim 0.5$ µs.