The general method of Nozawa-Steiner for analysis of the power balance in fusion reactors is applied to the case of the magnetic-mirror “Pure DD” fusion reactor. In order to achieve the overall plant efficiency η =30%, we need the plasma of the Lawson number nτ =10
16cm
-3. sec, in case of the efficiency of the direct converter η
d =0.7, that of the thermal converter η
t=0.4, that of the neutral beam injector η =0.7, that of absorption η
a = 1 and the ion temperature T
i=200KeV.
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