Hannover 2016 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
P: Fachverband Plasmaphysik
P 7: Magnetic Confinement I
P 7.2: Fachvortrag
Dienstag, 1. März 2016, 11:30–11:55, b305
Magnetic Flux Surface Measurements at the Wendelstein 7-X Stellarator — •Matthias Otte1, Tamara Andreeva1, Christoph Biedermann1, Sergey Bozhenkov1, Joachim Geiger1, Samuel Lazerson2, and Thomas Sunn Pedersen1 — 1Max-Planck-Institut für Plasmaphysik, Greifswald, BRD — 2Princeton Plasma Physics Laboratory, Princeton, USA
Recently the first plasma operation phase of the Wendelstein 7-X stellarator has been started at IPP Greifswald. Wendelstein 7-X is an optimized stellarator with a complex superconducting magnet system consisting of 50 non-planar and 20 planar field coils and further 10 normal conducting control and 5 trim coils. The magnetic confinement and hence the expected plasma performance are decisively determined by the properties of the magnet system, especially by the existence and quality of the magnetic flux surfaces. Even small error fields may result in significant changes of the flux surface topology. Therefore, measurements of the vacuum magnetic flux surfaces have been performed before plasma operation. The first experimental results confirm the existence and quality of the flux surfaces to the full extend from low field up to the nominal field strength of B=2.5T. This includes the dedicated magnetic limiter configuration that is exclusively used for the first plasma operation. Furthermore, the measurements are indicating that the intrinsic error fields are within the tolerable range and can be controlled utilizing the trim coils as expected.