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(IFP/13) A Distributed Radiator, Heavy Ion Driven Inertial Confinement Fusion Target with Realistic, Multibeam Illumination Geometry

   
D. A. Callahan-Miller  and M. Tabak 
 
Lawrence Livermore National Laboratory Livermore, CA 94551 USA

Abstract
This paper presents a series of heavy ion driven, inertial confinement  fusion targets that all have adequate gain ($>$ 50) for inertial fusion energy. These targets are based on the distributed radiator concept in which much of the hohlraum  is filled with low density converter material in approximate pressure balance. This target is driven by heavy ion beams with a Gaussian spatial distribution in a multibeam geometry that is consistent with the number of beams needed by the accelerator and the space needed by the final focusing system. Because the optimal ion species and kinetic energy depend on the integrated system of accelerator, final focusing, chamber transport, and target, we have extended the distributed radiator target to accept ions with range of $\rm0.035 g/cm^2$ to $\rm0.08 g/cm^2$. In addition, a ``close coupled'' version of the target, in which the hohlraum wall is brought in closer to the capsule to increase the coupling effciency, has produced gain $>$ 130 from 3.3 MJ of beam energy.

 

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