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Swept Langmuir probes are useful for determining temperature, potential and density in the peripheral sector of fusion plasmas. In this investigation a new electronic wiring was used successfully in order to measure the probe electricity. Consideration of the temperature fluctuations and the voltage sector are necessary. The improvements lead to more precise readings and easier analysis. They also led to lower results for the electron temperature T(e). Calculations of the plasma potential are limited in their accuracy. In order to analyse the probe indication lines, the deviations of measurement points from the ideal indication line were calculated and analysed. The readings were compared to those of Langmuir probes used in a parallel way, which showed agreement. The measurement method has fulfilled the expectations. It is planned to establish the fast swept Langmuir probe as a standard diagnostic.

Additional information

Authors: PFEIFFER U, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE)
Bibliographic Reference: Report: IPPIII/226 DE (1997) 65pp.
Availability: Available from the Max-Planck-Institut für Plasmaphysik, 85748 Garching bei München (DE)
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