Effects of cryogenic target misalignment and capsule nonuniformity on deuterium-tritium layer uniformity

The interrelation between the temperature difference of the deuterium and tritium(DT) outer surface and roughness of the DT layer has been obtained in theory for the indirect drive targets of inertial confinement fusion. Taking the Laser Magajoule(LMJ) as a prototype, the effects of target misalignment from the center of the hohlraum on the axial axis and the nonuniformity of the capsule on the DT layer temperature profiles have been simulated with a CFD code (Fluent). Then, the thickness nonuniformities of the DT layer have been calculated with the theoretical expression. The results show that in order to satisfy the requirement of ignition, the target misalignment must be less than 8.5 μm, and the RMS roughness of the capsule should be controlled in 0.72 μm.