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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
0.035g/cm2 to
0.08g/cm2. 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.
IAEA 2001
