[en] An rf linac accelerator system with accumulator(s) is described to meet the target requirements for ion beam fusion using a conservative extrapolation of the current state-of-the art. No optimization of the design is done, although clearly there are many trade-offs that might be possible, i.e., a higher ion charge state reduces the length of the linac at the expense of more accumulator rings and transport systems to the target. The system which accelerates Xenon in a plus 3 charge state has a linac of reasonable length, but the necessity of not exceeding emittance limits dictated by the target and reactor design (and to a lesser extent space-charge limits) require 12 accumulators each with eight transport lines. For reasons of cost and complexity this might not be the best solution. It should be pointed out, however, that progress on obtaining smaller emittance beamc (or alternately transporting larger emittance beams) and/or transporting partially neutralized beams can greatly reduce the number of transport lines and make the Xe⁺³ design more attractive. The Xe⁺³ system could be scaled down for a Heavy Ion Demonstration Experiment (HIDE). Because of these reservations, the confidence level is certainly higher for the A = 200 system, particularly for the +1 charge-state, than for the Xenon systems