Recent developments in the controlled nuclear fusion research are summarized. After giving some insights into the feature of the D-T steady state reactor, plasma confinement ploblems are discussed in three magnetic field geometries. In low beta torus, the most remarkable progress is shown in axismmetric toruses. In an inner conductor torus, stable plasmas are confined for the time of ideal magnetic confinement, that is, classical diffusion time and in a tokamak, the highest temperature and density are achieved as a torus. Stable confinements are also obtained in high beta plasmas of linear theta pinch geometries. In order to prevent end losses, theta pinch experiments in toroidal geometries are now under way. The same order of densities and temperatures as low beta torus are achieved in mirror devices and after suppression of micro-instabilities the remaining problem is to overcome the collisional end losses.
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