The general method of Nozawa-Steiner for analysis of the power balance in fusion reactors is applied to the case of the magnetic-mirror D-
3 He fusion reactor. In order to achieve the overall plant efficiency η=30%, we need the plasma of the Lawson number n
τ =4×10
14 cm
-3. sec, in case of the efficiency of the direct converter η
d=0.7, that of the neutral beam injectorη
h=0.7, that of absorption η
a=1 and the ion temperature T
i=200 KeV.
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