Figure 4
From: Shock assisted ionization injection in laser-plasma accelerators

Influence of the shock position, the laser energy and the electron density on the beam properties.
(a) Peak energy as a function of the shock position, for ne = 5.3 ± 0.4 × 1018 cm−3. (b) Electron beam energy and charge as a function of the laser energy, for ne = 5.6 ± 0.3 × 1018 cm−3. (c) Beam charge and energy as a function of the electron density. In (b,c) the shock position is zs = −1.02 ± 0.02 mm. Error bars indicate the standard deviation.