Maintenance oriented tokamak reactor with low activation material and high aspect ratio configuration

Some of the difficulties of maintenance of a tokamak system are due to the radioactivity of its materials and the complexity of its configuration. To mitigate these difficulties, very low activation SiC/SiC composite material and a torus configuration with a high aspect ratio of eight are introduced. The torus system is divided radially into equal sectors, each of which forms an assembling unit. All piping and feeder systems are shifted to the spacious central torus region. The new concept is called DREAM tokamak reactor, which is an acronym for DRastically EAsy Maintenance. The maximum toroidal field strength of 20 T and the plasma major and minor radii of 16 m and 2 m lead to a high fusion power of 5.5 GW, under moderate physics constraints such as an MHD safety factor of three, a Troyon factor of three for the beta limit and an energy confinement time enhancement factor of two.