Plasma diagnostics is very important on the control of the thermonuclear fusion reactor. Several methods of plasma diagnostics are reported by many investigator. This paper describes on the study of characteristics of the electrostatic probe on the stable grow plasma which is confined by week Z-magnetic field. As the result of the characteristic curves, the plasma electron temperature is nearly 105 (○K).

Ⅰ 緒言　Ⅱ 実験装置及び実験方法　Ⅲ 実験結果及び検討　Ⅲ-1 Langmuir probeの特性　Ⅲ-2 Double probeの特性　Ⅲ-3 Coaxial probeの特性　Ⅳ 検討　Ⅴ 結言