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Abstract

The diagnostic difficulties in measuring electron temperature fluctuations with a relative level below 1% are outlined. It is shown that correlation radiometry of electron cyclotron emission (ECE) provides sufficient sensitivity to overcome the limit set by intensity fluctuations of thermal radiation. The experimental set-up, the first results obtained at the W7-AS stellarator and a first comparison between the two different correlation schemes are described.
An overview of the W7-X concept, parameters and planned diagnostics is given. W7-X allows access for all fusion plasma relevant diagnostics, despite its complex 3-dimensional geometry resulting from the Helical Advanced Stellarator (HELIAS) concept and its realization with superconducting coils.
A survey of experimental techniques and analysis tools used at W7-AS for the investigation of the equilibrium, stability, transport and edge plasma is given, and examples for typical results are presented. .

Additional information

Authors: WELLER A ET AL, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE);SURVOROV E V, Institute of Applied Physics, Nizhniy Novgorod (RU);HARTFUSS H J ET AL, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE);KICK M ET AL, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE)
Bibliographic Reference: Report: IPP III/210 EN (1996) 60pp.
Availability: Available from Max-Planck-Institut für Plasmaphysik, 85748 Garching bei München (DE)
Record Number: 199610638 / Last updated on: 1996-05-27
Category: PUBLICATION
Original language: en
Available languages: en