The maximum gain attainable from fast-ignited direct-drive implosions is derived based on realistic target designs and laser pulses, one-dimensional simulations of the implosion, and two-dimensional simulations of ignition by a collimated electron beam and burn propagation. Since the implosion characteristics are set by the optimized target design, the ratio of the thermonuclear energy to the compression laser energy is a unique function of the driver energy on target. It is shown that, if ignited, the fuel assembled by a 100-kJ UV laser can yield close to 6MJ of thermonuclear energy.
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Betti et al. (2006) studied this question.
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