The relation between the methods of Lawson and of Nozawa-Steiner for analysis of the power balance in fusion reactors is clarified by taking into account, manifestly, the effects of the radiation loss in the method of Nozawa-Steiner.
Furthermore, the criterions for achieving the zero output and the overall plant efficiency η= 30% are obtained by including the efficiencies of the heating device and the direct converter in the DT fusion reactor.
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