The design study for the laser fusion power plant KOYO has been conducted as a joint programme of universities, national laboratories and industries in Japan and also with international collaboration. In the design of KOYO, gain scaling of direct drive implosion with 0.35 mm wavelength laser light is used. A driver of diode pumped solid state laser (DPSSL) generates 4 MJ per pulse with 12 Hz, and the output pulses are switched so as to deliver the laser energy successively to four chambers, which operate with 3 Hz. The chamber wall is protected by thick liquid metal which flows down in a SIC woven tube. Following the conceptual design study, the critical key issues which may affect the technical and economic feasibility of the commercial power plant KOYO have been examined. Research and development of some key technologies have been performed. As a result of the KOYO tudies, it is concluded that the technical and economic feasibility of laser fusion reactor is well within the authros' scope.
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