Thermonuclear device

Purpose: To avoid the reduction of tritium breeding ratio in the breeding blanket disposed within a range screened by an impurity removing neutralizing plate and a support therefore, in a impurity removing device such as limiter or diverter. Constitution: A breeding blanket and an impurity removing device for exhausting helium in a plasmas out of the reactor are disposed within the torus type vacuum container. The impurity removing device comprises a diverter plate, a support plate and a neutron breeding material such as of lead or beryllium plate disposed on the surface of the support plate. Thus, since neutrons generated in plasmas are bred by the neutron breeding material before the support plate for supporting the neutralizing plate, many neutrons enter the breeding blanket to improve the tritium breeding ratio therein. (Horiuchi, T.)