Berlin 2001 – scientific programme

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P: Plasmaphysik

P 8: Magnetic Confinement and Plasma Technology (Poster Session)

P 8.13: Poster

Monday, April 2, 2001, 12:30–15:00, AT2

Analysis of the thermal energy quench period during disruptions in the tokamak TEXTOR-94 — •A. Savtchkov, G. Mank, and K.H. Finken — Institut für Plasmaphysik, Forschungszentrum Jülich GmbH, EURATOM Ass., 52425 Jülich, Germany

The thermal energy and current decay phase of disruptions at the tokamak TEXTOR-94 have been observed by the means of several diagnostics. Besides plasma current, loop voltage, and spectroscopic observations a fast measurement of heat pulses during disruptions is possible with an infra-red (IR) camera system. The 12 bit IR observation allows a time resolution of about 100 µs for one dimension. These measurements are combined with an IR diode observation, allowing to observe heat pulses with 4 µs time resolution. The toroidal belt limiter ALT-II is equipped for current measurement and allows an estimate of the toroidal extension of the flux hitting the plasma facing components. Besides the determination of the modes numbers with Rogowski coils and ECE diagnostic the magnitude of the field perturbation can be determined by the use of Hall probes, which can be inserted into the scrape off layer.