Theoretical and numerical analysis of auxiliary heating for cryogenic target fabrication

In order to compensate for the nonsphericalsymmetric heat flux in the hohlraum, auxiliary heating is usually applied to the outside wall of the hohlraum during the cooling process. A one-dimensional heat exchange theoretical model has been proposed in the indirect-drive target, to analyze the required auxiliary heat flux. With a two dimensional axi-symmetric model, the auxiliary heating mechanism has been simulated by FLUENT code. The optimum heat flux which is 635 Ｗ/m２ has been obtained as the heaters around the outside of the hohlraum about 1.3 mm above and below the mid-plane. The result is in good agreement with the theoretical model．