Fig. 1
From: Enhanced target normal sheath acceleration using colliding laser pulses
Geometry of the two-pulse scheme. Map of the longitudinal electric field Ex (blue-red, in TV m−1) in the (x, y) plane at different times in the reference case (a–c) and the two-pulse case (d–f). The position of the Al target is indicated by the dashed gray lines, and the thin proton layers are shown in green in a and d. The incidence angle is ϕ = 45°
