Introducing period ratio δ, the thermal efficiency of a periodical thermonuclear fusion reactor is studied. The moderate temperature of the coolant has no choice but to be low because of the small δ at present and the heat resistivity of materials. To overstep the ignited plasma criterion and to keep an adequate efficiency as a heat engine, the large power density is necessarily demanded. To reduce power density, continuous combustion (δ=1) is expected.
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