12. 負磁気シア型高経済性トカマク核融合炉 : CREST (<特集>核融合エネルギーの社会的受容性と科学的見通し III)

概要

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The Cost down of tokamak fusion reactors is one of the key issues that must be dealt with in order to deploy fusion energy for commercial use. Our previous study of the costs of tokamak power plants has shown that a very high Troyon coefficient β_N(up to 5 or 6)is required in order to realize a cost-competitive tokamak reactor. A reversed shear configuration, which has been observed recently in several tokamak experiments, might results in such a low cost tokamak. In this study, we propose a compact commercial reactor based on the shear reversed high beta equilibrium, which is named the Compact REversed Shear Tokamak(CREST). The optimized parameters of CREST are; major radius R=5.4m, maximum toroidal field B_max=12.5T(5.6T at plasma center), and fusion power P_f=3GW with 4.5MW/m^2 in the mean neutron wall load. The ideal MHD instabilities are all stable in this equilibrium while the β_N value reaches 5.5. The plasma configuration of CREST is close to that of ITER advanced mode plasma. This will encourage an investigation of the feasibility of the CREST concept by ITER. Although many further studies and developments are necessary, such compact tokamak can be costcompetitive as an electric power source in the 2lst century and could be a promising tool in the development of a commercial tokamak reactor succeeding the ITER project.
社団法人プラズマ・核融合学会の論文
1998-09-25