Hannover 2016 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 17: Plasma Diagnostics II
P 17.3: Fachvortrag
Mittwoch, 2. März 2016, 15:25–15:50, b305
Magnetic diagnostics at Wendelstein 7-X — •K Rahbarnia1, T Andreeva1, A Cardella2, B Carvalho3, M Endler1, D Hathiramani1, O Grulke1, U Neuner1, J Svensson1, H Thomsen1, J Geiger1, and A Werner1 — 1Max Planck Institute for Plasma Physics, Wendelsteinstr. 1, 17489 Greifswald, Germany — 2Former W7-X, presently JT-60SA project, F4E c/o IPP Boltzmannstr. 2, 85748 Garching, Germany — 3Instituto de Plasmas e Fusao Nuclear Instituto Superior Tecnico, Lisbon, Portugal
An arrangement of magnetic sensors has been installed at the stellarator Wendelstein 7-X (W7-X) including over 300 individual 3D shaped sensors like diamagnetic loops, Rogowski, Saddle and Mirnov coils. Future long pulse operation of up to 1800 s demands an optimization of materials, thermal shielding and signal integration accuracy. The main objectives are the reconstruction of magnetic equilibria and monitoring the diamagnetic plasma energy. Generally, in stellarators a toroidal current drive is not necessary to maintain confinement. Minimization of toroidal currents is in fact one of the major optimization criteria of W7-X. It will be investigated by continuous and segmented Rogowski coils and Saddle coils measuring e.g. bootstrap and Pfirsch-Schlüter currents and their spatial distributions. A set of 125 toroidally and poloidally arranged Mirnov coils will give information on MHD and Alfvén mode activity and edge localized modes (ELMs). A detailed overview of the magnetic diagnostic system is outlined and initial results obtained during the first operation phase of W7-X will be presented.