Control of Fuel Mass Loaded in a Cryogenic Foam Target for Inertial Confinement Fusion Experiment

We have successfully developed a technique to control fuel mass loaded in a cryogenic foam target for laser fusion research. An empty cavity is formed inside a spherical shell filled with liquid deuterium by heating the foam shell immersed in liquid deutrium. The foam shell target is then pulled out of the liquid. The liquid deuterium is frozen by increasing flow rate of liquid helium which cools the cryostat and reducing the pressure of surrounding gaseous deuterium. The target is irradiated by the laser beams from Gekko XII laser system. The detailed technique in this method and numerical evaluation on thermal balance in the target are presened.