Modeling of the driver transverse profile for laser wakefield electron acceleration at APOLLON research facility

The quality of electron bunches accelerated by laser wakefields is highly dependant on the temporal and spatial features driver. Analysis experiments performed at APOLLON PW-class facility shows that instabilities focal spot, such as shot-to-shot pointing fluctuations or asymmetry transverse fluence, lead to charge energy degradation bunch. It shown PIC simulations can reproduce experimental results with a significantly higher accuracy when measured asymmetries are included in simulated laser's profile, compared ideal, symmetric profile. A method based modified Gerchberg–Saxton iterative algorithm used retrieve electric field from fluence measurements vacuum volume, accurately using simulations, leading spectra close agreement results, for charge, distribution, beam exit plasma.