Fig. 3
From: Control of laser plasma accelerated electrons for light sources
Electron beam transverse profiles observed on the first LANEX screen. Measured transverse profile without (a) and with (d) permanent magnet quadrupoles of variable strength (QUAPEVA). b, e Associated numerical simulations (see Methods section) of the transverse profile assuming a broadband energy spectrum spanning from 50 to 280 MeV and using the measured divergences and a screen resolution of 150 μm and simulated electron energy distribution in the transverse plane (c, f)
