The basic theory on ionized gas had been proposed, and its ionized gas was named “Plasma” by Langmuir. After that, the investigations on plasma physics has developed extensively. In present, the controlled thermo-nuclear fusion research groups have spent enormous efforts and not inconsiderable funds in attempts to produce a magnetically confined high temperature plasma in laboratory. Further, large groups of experimenters are attempting to diagonose the parameters of plasma more exactly, e. g., electron and ion number, temperature, and plama potential, etc. In the paper, the digests of plasma physics and its applications, especially, the approaching to the thermo-nuclear fusion reactor, and plasma diagonostics are described.

Ⅰ 緒言　Ⅱ Plasma物理と熱核融合炉における問題　Ⅱ-1 Plasmaの平衡と安定性　Ⅱ-2 Plasma加熱　Ⅱ-3 熱核融合炉への展望　Ⅲ Plasma診断　Ⅲ-1 探針による診断　Ⅲ-2 Micro-Waveによる診断　Ⅲ-3 光学的測定による診断　Ⅳ 結言