Figure 6
Evolution of the plasma speed and the mean electron Lorentz factor. (a) Plasma speed as a function of the laser spot size \((\frac{{W}_{0}}{{\lambda }_{{\rm{L}}}})\) at the transparency time (tbreak), computed from simulation results (see methods). Dashed blue lines, \(\bar{{\mathscr{Z}}}=1\); orange dashed lines, \(\bar{{\mathscr{Z}}}=1/2\); green line, \(\bar{{\mathscr{Z}}}=1/3\). (b) Mean electron Lorentz factor (4) as a function of the plasma speed during the transparency regime.
