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Two-dimensional simulations of ion beam driven fast ignition are presented.Ignition energies of protons with Maxwellian spectrum and carbon ions withquasimonoenergetic and Maxwellian energy distributions are evaluated. Theeffect of the coronal plasma surrounding the compressed deuterium-tritium isstudied for three different fuel density distributions. It is found that quasi-monoenergetic ions have better coupling with the compressed deuterium-tritiumand substantially lower ignition energies. Comparison of quasimonoenergeticcarbon ions and relativistic electrons as ignitor beams shows similar laserenergy requirements, provided that a laser to quasimonoenergetic carbon ionconversion efficiency around 10% can be achieved.

Fast ignition of inertial fusion targets by laser-driven carbon beams