Abstract
Preliminary results of a two-dimensional design study are discussed for a SiO2 foam filled Hohlraum containing a Bi-coated re-emission capsule. The Hohlraum wall consists of a Au–U “cocktail” designed to maximize the amount of x-ray energy produced for the capsule to absorb, given the 1MJ laser energy into the Hohlraum. The foam fill acts to minimize wall expansion while maintaining symmetric drive on the capsule. Various foam densities and laser pointings for most efficient drive are considered. Sensitivities to drive asymmetries during the long “foot” portion of the laser drive are calculated and shown for the re-emission capsule. The foam fill was found to affect the re-emit symmetry much more than a H∕He gas fill. Compensating effects in beam balance or pointing are required to maintain best symmetry. The effect of the diagnostic on the Hohlraum environment with a Cu-doped Be ignition capsule is discussed. Effects of optimal filtering for maximum signal detectability are considered.
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