Heating of the imploded plasma by fast ions in the fast ignition scheme

In the fast ignition scheme of laser fusion, the laser-accelerated particles~are used to heat the imploded plasma core. We have been tying to increase the~energy coupling from heating laser~to the plasma core by generating MeV fast~electrons with improved high-contrast of the heating laser,~usage of magnetic field,~and optimization of cone shape. For further improving the~energy coupling, we are trying to use~laser-accelerated ion for heating plasma~in addition to the~heating by fast electrons. When CD plasma is directly~irradiated by the ultra-intense laser,~C and D ions can be~accelerated~as well as~electrons. Based on the~hole-boring~model by S. C. Wilks PRL 69 (1992) 1383, ion can be accelerated up to MeV kinetic energy by ultra intense laser, and its conversion efficiency~from the laser to fast ions~can be estimated to be order of 1{\%}.~This ion acceleration~is confirmed by~PIC simulation with the FIREX~condition, Sakagami et al., Nuclear fusion 49 (2009) 075026. In this paper, we show the concept and numerical analysis of ion acceleration and its energy deposition to the plasma.~