GEANT4 simulations GeV electron beam Geant4 Mathematics & science Monte Carlo simulation Monte Carlo simulations Particle Induced X-ray Emission Research & information: general Seya-Namioka monochromator TNSA Thomson parabola collisional-radiative model compact electron accelerator electromagnetic pulse elemental analysis far-ultraviolet spectroscopy high repetition rate target high-intensity lasers imaging plate ion acceleration laser electron acceleration laser plasma laser proton acceleration laser wakefield acceleration laser-accelerated ion beams laser-accelerated protons laser-driven ion acceleration laser-plasma acceleration laser-plasma accelerator laser-plasma interaction