München 2019 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 18: Postersitzung

P 18.58: Poster

Donnerstag, 21. März 2019, 16:30–18:30, Foyer Audimax

First results of the confinement properties in configuration scans during the recent experimental campaign of Wendelstein 7-X — •Tamara Andreeva for the The Wendelstein 7-X Team collaboration — Max Planck Institute for Plasma Physics, Wendelsteinstr. 1, 17491 Greifswald, Germany

Wendelstein 7-X is a modular advanced stellarator, combining the modular coil concept with the optimized properties of the plasma. The machine went into operation in December 2015 at the Max-Planck-Institut für Plasmaphysik in Greifswald, Germany, and recently successfully finished its second divertor phase experimental campaign OP1.2b, devoted to the exploration of the Test Divertor Unit, high performance hydrogen discharges and verification of the W7-X optimization principles.

The predecessor experiment Wendelstein 7-AS revealed that in low to medium density plasmas small configuration changes in the rotational transform (iota) near rational iota values could lead to a significant variation of confinement. Configuration scans conducted in the recent W7-X experimental phase OP1.2b aimed to investigate similar effects by varying gradually the rotational transform with help of the planar coil currents for otherwise same discharge conditions. The configurational space between high iota and standard reference magnetic configurations was chosen, since the high iota magnetic configuration has an almost negligible value of the bootstrap current at low densities. This contribution presents the observed results of the configuration scans.