Compact reversed shear tokamak reactor with a superheated steam cycle

The compact reversed shear tokamak CREST is a costcompetitive reactor concept based on a reversed shear high βplasma and water cooled ferritic steel components. The moderate aspectratio A = 3.4 and the elongation κ = 2.0 of CREST are verysimilar to the case of the ITER advanced mode plasma. Presentation of such aconcept based on the ITER project should be worth while forformulating a fusion development strategy. The achievement of acompetitive cost of electricity (COE) is the first priority forelectric power industries. High β and high thermal efficiency arethe most effective parameters for achieving a competitive COE. In orderto achieve a high efficiency power plant, a superheated steam cycle has been adopted which permits a high thermal efficiency(η = 41%). Current profile control and high speed plasmarotation by neutral beam current drive stabilize the ideal MHDactivity up to the Troyon coefficient βN = 5.5. A costassessment has shown that CREST could generate about 1.16 GW(e)electric power at a competitive cost.