Beam dynamics and emittance growth during final beam bunching in HIF driver systems

Beam dynamics is investigated by multiparticle simulations during final beam bunching and final beam focusing in a driver system for heavy-ion inertial fusion. The particle simulations predict the emittance growth during the longitudinal bunch compression for various particle distributions at initial conditions. Particle distributions in the beam transverse cross-section approach uniform during the final beam bunching. It is found that the distribution has the Gaussian profile at the focal spot in the radial direction after the final focusing.