Indirect-driven target for ICF

An indirect-driven target is proposed here for use in ion-beam fusion. The target is a cryogenic hollow one, which has double shells with five layers, and releases a fusion output energy of 3 GJ. The spherical target has a radius of 8.716 mm and consists of a lead tamper, a lead radiator, a vacuum radiation gap, an aluminum absorber (pusher), and DT fuel. When 80% of the driver energy (12 MJ) is deposited in the radiator layer, the temperature of the layer increases to 1.76 keV. Although the temperature decreases to 600 eV owing to the expansion of the layer, 60% of the deposited beam energy is converted to soft X rays. The temperature on the outer surface of the absorber layer becomes uniform through the mixing of radiations in the radiation gap, and the pressure on the outer surface of the absorber layer increases to 7.15 x 10¹² Pa. The inner void of the spherical target plays the role of a converging supersonic nozzle for the fuel to be compressed. The adiabatic compression of the fuel in the converging supersonic nozzle is important in achieving the final fuel pressure of 10¹⁷ Pa.