We present the design of a linear inductive voltage adder system for PBFA II that could permit high convergence radiatively-driven implosion experiments with two ring-shaped two-stage extraction diodes. The design incorporates two linear inductive voltage adder modules with feromagnetically-loaded cavities, one for the upper half and another for the lower half of PBFA II, and can be positioned vertically or horizontally in a head-to-head linear configuration with the diodes at the center. The design provides a total of (approximately)20 - MV kinetic energy to the lithium ions with 100-TW electrical power delivered to the diodes. If diode, ion, and transport efficiencies are taken into account, the design is capable of depositing to a 6-mm diameter target a total peak ion power on the order of 55 TW, which corresponds to a specific peak power density of 50 TW/cm(sup 2).
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