Abstract
PIG discharges with uniform magnetic field configuration and Divertor type field configuration are studied. Low frequency fluctuations in the plasma column are observed by a Langmuir probe and two photo-transisters. In the case of uniform field configuration, the frequencies of fluctuation agree well with the theory by Hoh and Simon. In the case of Divertor type field configuration, the amplitude of fluctuation is small compared with that for uniform field configuration. Plasma parameters (space potential, particle density and electron temperature) are measured for both magnetic field configurations. The most remarkable difference between two types of field configurations exists in radial electric field intensity. In a uniform configuration, the radial electric field E r is about 3–4 V/cm. Whereas in a Divertor type field configuration, E r is only 0.2 V/cm or less. This small E r results in a rather quiescent PIG discharge in a Divertor type field configuration.
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