Bremen 2017 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 15: Helmholtz Graduate School II
P 15.3: Poster
Dienstag, 14. März 2017, 16:30–18:30, HS Foyer
Power loads and power decay lengths in the limiter phase of Wendelstein 7-X — •Holger Niemann1, Marcin Jakubowski1, Ralf König1, Thomas Sunn Pedersen1, and Glen Wurden2 — 1Max-Planck Institut für Plasmaphysik, Wendelsteinstraße 1, 17491 Greifswald — 2Los Alamos National Laboratory, Los Alamos, USA
Wendelstein 7-X (W7-X), an advanced stellarator with five-fold symmetry, started its initial plasma operation phase(OP1.1) in December 2015. In OP1.1 the plasma-wall interaction was realized with 5 graphite limiters installed on the inboard side of the plasma vessel. Calculations shows typical three separate helical magnetic flux bundles of different connection length in the order of a few tens of meters. These form 3-D structure of magnetic footprints results in localized peaks in the limiter power deposition patterns. The surface temperature on the limiters was investigated with two IR cameras: a microbolometric camera (8-14 µm, spatial resolution 5 mm) observes the left side of the limiter in modulel 5 from the top and a high resolution IR camera (3-5 µm, spatial resolution 1 mm) observes three tiles above the midplane of limiter 3. The heat flux density is evaluated with the THEODOR code from evolution of the surface temperature data. Both cameras observed heterogeneous structure of power loads. The flux tube with longest connection length (about 80 m) carries highest heat flux to the limiter. The calculated heat flux density for the longest connection length given by the THEODOR code is up to 5-6 MW/m 2 . From the perpendicular power flux the parallel power flux and the power decay length is calculated. This gives a power decay length up to 1-2 cm.