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Fluctuations of the electron temperature can cause a significant amount of the anomalous electron heat conductivity observed on fusion plasmas, even with relative amplitudes below 1 %. None of the standard diagnostics used to measure the electron temperature in the confinement region of fusion plasmas is provided with sufficient spatial and temporal resolution and the sensitivity for small fluctuation amplitudes. In this work a new diagnostic for the measurement of electron temperature fluctuations in the confinement region of fusion plasmas was developed, built, tested and successfully applied on the W7-AS Stellarator. The intensity interferometer consists of two four-channel heterodyne radiometers with sightlines defined by means of adjustable Gaussian beam optics. With the help of a specially developed quasithermal radiation source, the intensity interferometer was tested and the potential of the correlation technique demonstrated.

Additional information

Authors: SATTLER S, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE)
Bibliographic Reference: Report: IPP III/193 DE (1993) 176 pp.
Availability: Available from Max-Planck-Institut für Plasmaphysik, 8046 Garching bei München (DE)
Record Number: 199410311 / Last updated on: 1994-11-28
Original language: de
Available languages: de
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