Cryogenic Targets for Inertial Confinement Fusion

A good place to begin is with a review the specifications of the inertial confinement fusion target designers. The word ‘specifications’ used to be interchangeable with the phrase ‘wish-list’, simply because the ideals of the target theorist and the actualities of the target fabricator often were far apart. A variety of different target designs are under consideration, but the cryogenic, high-gain target is currently specified to be a 1000 µm-diameter, 10µm-thick plastic ablator shell containing a 100µm-thick liquid or solid D 2 or DT fuel layer. These targets are to be filled to pressures up to 1100 atm at room temperature, cooled to 25 K or below, and held at that temperature while they are layered and then shot. The techniques by which symmetric, smooth fuel layers possibly can be prepared fall naturally into two categories, namely liquid layering techniques and solid layering techniques.