Mechanisms to control laser-plasma coupling in laser wakefield electron acceleration

Experimental results, supported by precise modeling, demonstrate optimization of a plasma-based injector with intermediate laser pulse energy ($<1\text{ }\text{ }\mathrm{J}$), corresponding to normalized vector potential ${a}_{0}=2.15$, using ionization injection in tailored plasma density profile. An increase electron bunch quality and is achieved experimentally the extension downramp at exit. Optimization focal position profile shown efficiently reduce angular deviation, leading better alignment axis. Single peak spectra are produced previously unexplored regime combining an early adaptive optic control wavefront optimizing symmetry prefocal distribution. results have been validated through particle-in-cell simulations realistic energy, phase distribution, temporal envelope, allowing for accurate predictions difficult model parameters, such as total charge spatial properties bunches, opening way more modeling design accelerators.