The uniformity of deuterium-tritium (DT) ice layer plays a key role in the successful ignition of indirective inertial confinement fusion (ICF)

and is closely related to the temperature field of the cryogenic target

especially the temperature uniformity around the fuel capsule. In this study

CFD simulation is performed on the thermal field of cryogenic target using a spherical hohlraum under stable and unsteady cooling conditions. Two kinds of ablation layer material

i.e.

the hydrocarbon (CH) and the high-density carbon (HDC) are considered

and the effects of DT ice profile on their temperature distribution are analyzed. The results show that the high thermal conductivity of the target material has a positive effect on improving the field uniformity of the target’s temperature. If the thermal conductivity of an ablative material is higher than 400 W/(m·K)

the temperature difference on the outer surface of the target will be less than 0.01 mK. In the cooling process

the HDC target with higher specific heat capacity and thermal conductivity provides a much smaller temperature difference than the CH target.