Beam Dynamics and Pulse Duration Control During Final Beam Bunching in Driver System for Heavy Ion Inertial Fusion

In accelerator system for heavy ion inertial fusion, beam dynamics is investigated by particle-in-cell simulations during final beam bunching. The calculation results show that the emittance growth during the longitudinal bunch compression for various particle distributions at the initial conditions and with two types of transverse focusing model, which are a continuous focusing and an alternating gradient focusing lattice configurations. Dependence in the pulse duration of heavy ion beam is investigated for effective pellet implosion, and the voltage accuracy requirement at the beam velocity modulator is also estimated for the final beam bunching.