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Radiation dominated implosion

Inertical Confinement Fusion configuration model is analized for direct ignition without an ablator. The compression of the target pellet is neglected and rapid volume ignition is achieved by a laser pulse, which is as short as the penetraton time of the light across the pellet. The reflectivity of the target is assumed to be negligible, and the absorptivity is constant so that the light pulse can reach the opposite side of the pellet. The necessary pulse length and pulse strength is calculated.