A new method for measuring x-ray drive in Nova hohlraums near target center using surrogate targets is proposed as an alternative to conventional wall-based techniques. A solid, low-density ( 0.3g/cm³) SiO₂ aerogel ball placed at the center of a Nova hohlraum is used to infer x-ray drive from the backlighter-imaged ablatively driven shock trajectory. A nearly 10% (40%) increase in peak radiation temperature (flux) near the hohlraum center in the presence of axial shields is predicted from radiation-hydrodynamics simulations and corroborated by experiment.
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Amendt et al. (1996) studied this question.
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