Nuclear fusion device

Object: To provide a tokamak type nuclear fusion device which can prevent a limiter from being molten and failed to thereby prevent deterioration of material in associated devices, lowering in strength and lowering in life as a result of thermal fatigue. Structure: A vacuum vessel is interiorly provided with a liner to protect this vessel from plasma and confine the plasma therein, the liner having a pier-like limiter disposed on a part thereof. This limiter is interiorly provided a hollow chamber which is filled with metal of a low melting point. With this construction, when heat load is received from the plasma, temperature of tube walls of the limiter is increased and temperature of metal of a low melting point within the tube also increases accordingly. When further heated, the temperature of tube walls of the limiter will not further increase because of latent heat due to vaporization of the metal of a low melting point. (Horiuchi, T.)