Measurement of edge plasma parameters in KT-1 tokamak by single/Mach probes

Summary form only given, as follows. A combined system of a single probe and a Mach probe is used for the simultaneous measurement of electron temperature, plasma density, floating potential and flow velocity from edge plasma in a KT-1 small tokamak (R:27 cm a:5 cm) during Ohmic discharges. Typical values of electron temperature, plasma density, and floating potential by a single probe are 19/spl sim/22 eV, /spl sim/3/spl times/10/sup 11/ cm/sup -3/, and -14/spl sim/-22 volts, respectively, for most discharges. A Mach probe has been used for the measurement of toroidal flow velocity, plasma density, and directional electron temperatures. The big difference of parallel and antiparallel electron temperatures indicates the asymmetry of the electron behavior around the plasma facing components (PFC).