Theoretical and numerical analysis of auxiliary heating for cryogenic target fabrication

In order to compensate for the nonspherical-symmetric 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.