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P: Plasmaphysik

P 4: Diagnostics II

P 4.2: Vortrag

Dienstag, 3. April 2001, 16:45–17:00, 2032

Development of an ECE Imaging system for W7-AS — •Stefan Bäumel and Hans-Jürgen Hartfuß — Max-Planck-Institut für Plasmaphysik, EURATOM Association, D-85748 Garching

The intensity of the electron cyclotron emission (ECE) along a radial sightline of a magnetically confined fusion plasma with sufficient optical depth can be used as a measure for the local temperature of the plasma electrons. The electron temperature is not constant in time but shows fast fluctuations with relative amplitudes of the order of less than 1 %. To get deeper insight in the physics of this plasma turbulence two dimensional information about the fluctuating structures is indispensible.

For the two-dimensional spatio-temporal characterization of these temperature fluctuations in the core of the W7-AS plasma an ECE imaging system with four vertically staggered sightlines has been developed. The system will be described in detail and first measurements will be presented.