Bonhomme, G.

Franck, C.

Grulke, O.

Klinger, T.

Madani, R.

Schröder, C.

Stark, A.

Zalach, J.

English

MPG.PuRe

The VINETA device: fundamental studies with stellarator applications

The VINETA device:fundamental studies with stallarator applicationsT. Klinger, G. Bonhomme, O. Grulke, C. Franck, R. Madani, C. Schröder, A. Stark, J. ZalachMax-Planck-Institut für Plasmaphysik, EURATOM Assoziation,Wendelsteinstrasse 1, D-17489 Greifswald, GermanyThe VINETA device is a linear magnetized helicon discharge (magnetic field B0≤0.1T). TheArgon plasma (column 4m length, 0.1m diameter) can achieve densities up to n=1019m-3 andtemperatures Te=3eV and Ti=0.2eV at moderate radiofrequency (RF) powers ≤ 6kW. TheVINETA device is used for basic experiments on drift wave turbulence, helicon waves andion dynamics in wave fields. Drift waves are investigated with high-resolution poloidal probearrays, providing space-time data for detailed statistical analysis. Of particular current interestis the role of the collisionality on the drift wave dynamics. To achieve independent control ofthe electron temperature, the helicon target plasma is additionally heated by a 7kW electron-cyclotron resonance system, under construction. The kinetics and drift dynamics of Argonions in the presence of wave fields, e.g. kinetic Alfvén waves and drift waves, is studied bymeans of diode laser-induced flourescence (DLIF). This versatile diagnostic tool providesboth ion temperatures, ion densities, mean ion drifts as well as perturbed velocity distributionfunctions. Of particular interest is the application of time-resolved DLIF to measure wavefields and drift mode structures. Finally, helicon modes are used for non-resonant waveheating of plasmas. The helicon discharge mechanism is known to be extremely efficient,even though the understanding is still far from being complete. It is planned to use heliconwave heating in the small l=2 stellarator WEGA as well. All these recently started basicplasma physics studies and diagnostics developments are seen to be of relevance forstellarator edge physics, where the plasma is not confined and a variety of pressure gradientdriven instabilities lead to anomalous transport behavior, in particular far-SOL profiles.

The VINETA device: fundamental studies with stellarator applications

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