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P: Plasmaphysik
P 9: Diagnostik II
P 9.7: Talk
Tuesday, March 16, 1999, 15:45–16:00, ZO 2
Experiments with dynamic diverting of the magnetic field lines in an ECR discharge — •J Stańco1, A Beck1, S Brezinsek1, D Hemmers1, H Kempkens1, S Meier1, D Reiter1, J Uhlenbusch1,2, and U Samm2 — 1Institut f"ur Laser- und Plasmaphysik, Heinrich-Heine-Universität Düsseldorf — 2Institut f"ur Plasmaphysik, Forschungszentrum Jülich
Experiments with an arrangement for dynamically diverting the magnetic field lines in a large-volume ECR discharge are reported. The goal is to influence the heat and particle transport to the walls of the discharge vessel, as induced by studies of a Dynamic Ergodic Divertor for the TEXTOR-94 tokamak. The perturbing magnetic field is generated by 4 bundles of so called Ioffe bars put around the ECR discharge vessel and fed with a low frequency (50 Hz, 1–10 kHz; I=510 A) current, with a phase shift of 90 degrees between the subsequent bundles. This produces a perturbing rotating magnetic field, whose radial component at the ECR discharge plasma edge amounts to about 1 mT. The influence of the perturbing field on plasma fluctuations has been investigated with the aid of optical probes and a fast CCD camera. Use of other diagnostics, such as Thomson scattering or Li beam excitation, for estimation of the influence of the perturbing magnetic field on plasma properties is foreseen.
This work was supported by the Deutsche Forschungsgemeinschaft within SFB 191 (Low temperature plasmas).