原型炉のための技術基盤確立に向けた日本の取組

The establishment of technology bases required for the development of a fusion demonstration reactor (DEMO) has been discussed by a joint effort throughout the Japanese fusion community. The basic concept of DEMO premised for investigation has been identified and the structure of technological issues to ensure the feasibility of this DEMO concept has been examined. The Joint-Core Team, which was launched along with the request by the ministerial council, has compiled analyses in two reports to clarify technology which should be secured, maintained, and developed in Japan, to share the common targets among industry, government, and academia, and to activate actions under a framework for implementation throughout Japan. The reports have pointed out that DEMO should be aimed at steady power generation beyond several hundred thousand kilowatts, availability which must be extended to commercialization, and overall tritium breeding to fulfill self-sufficiency of fuels. The necessary technological activities, such as superconducting coils, blanket, divertor, and others, have been sorted out and arranged in the chart with the time line toward the decision on DEMO. Based upon these Joint-Core Team reports, related actions are emerging to deliberate the Japanese fusion roadmap

Development of Strategic Establishment of Technology Bases for a Fusion DEMO Reactor in Japan

The strategic establishment of technology bases required for the development of a fusion demonstration reactor (DEMO) has been discussed by joint endeavors throughout the Japanese fusion community. The mission of Fusion DEMO is to demonstrate the technological and economic feasibility of fusion energy. The basic concept of Fusion DEMO has been identified and the structure of technological issues to ensure the feasibility of this DEMO concept has been examined. The Joint-Core Team consisting of experts from the Japanese fusion community including industry has pointed out that DEMO should be aimed at steady power generation beyond several hundred thousand kilowatts, availability which must be extensible to commercialization, and overall tritium breeding sufficient to achieve fuel-cycle self-sufficiency. The necessary technological issues and activities have been sorted out along with 11 identified elements of DEMO, such as superconducting coils, blanket, divertor, and others. These will be arranged within a time line to lead to the Japanese fusion roadmap

Control of Fusion Power in a Steady-state Tokamak Reactor-machi, Naka-gun lbaraki-ken 3 1 I -0 I

Abstract Possibility to control the fusion power in a steady-state tokamak reactor has been studied. Analysis by using lD self-consistent current drive code (ACCOME) and l.5D time-dependent transport code (TOPICS) indicates that the operational parameter for controlling the fusion power can be found under the operation constraints such as a fixed confinement improvement factor, the plimit, the density limit and the self-consistent current drive efficiency. A characteristic time constant for fusion power control depends on a time scale of the current ramp up/down which relates to a capability of the poloidal field coil system. Key issues to be solved to realize the fusion power control are discussed

核融合原型炉開発のための技術基盤構築の中核的役割を担うチーム報告

In accordance with the request of the Working Group on Fusion Research, the Nuclear Science and Technology Committee, the Subdivision on R&D Planning and Evaluation, the Council for Science and Technology, the Ministry of Education, Culture, Sports, Science and Technology, the joint-core team has worked on strategy for establishment of technology bases required for development of a fusion DEMO reactor by taking into account the progress of the ITER project, the BA activities, and academic researches such as the Large Helical Device. In particular, the concept of a fusion DEMO reactor premised for investigation and research and development activities to ensure the feasibility of this DEMO concept have been examined