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P: Plasmaphysik
P 8: Magnetic Confinement and Plasma Technology (Poster Session)
P 8.9: Poster
Monday, April 2, 2001, 12:30–15:00, AT2
Microscopic Structure of Turbulence in the Torsatron TJ-K — •Carsten Lechte1, Nils Krause1, Sven Niedner2, and Ulrich Stroth1 — 1Institut für Exp. und Ang. Physik, CAU Kiel, D-24098 Kiel — 2MPI für Plasmaphysik, EURATOM Ass., Garching
In magnetically confined fusion plasmas, turbulence leads to enhanced radial transport, which degrades confinement. The TJ-K torsatron is operated with rf discharges. The microscopic structure of the resulting turbulence is measured with spatio-temporal resolution.
Apart from Ḃ probes and microwave interferometry, the main diagnostics are Langmuir probe arrays. Due to the relaxed plasma parameters in TJ-K, they can be employed in the whole discharge volume. The Langmuir data are processed using correlation analysis and conditional averaging, yielding structure sizes and time scales of the turbulence. Together with the statistical properties of the fluctuations of density, plasma potential and transport, these quantities are compared to our numerical simulations.
Special interest lies in the scaling of these turbulence properties with the plasma parameters and the ion mass, so that the relevance of the TJ-K results for fusion plasmas can be assessed.