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P: Fachverband Plasmaphysik

P 12: Magnetic Confinement - Poster

P 12.6: Poster

Dienstag, 6. März 2018, 16:15–18:15, Redoutensaal

Commissioning of the soft X-ray tomography system (XMCTS) in the Wendelstein 7-X stellarator — •Christian Brandt, Natalie Lauf, Jonathan Schilling, Henning Thomsen, Alexander Card, Mirko Marquardt, Timo Schröder, Torsten Broszat, Ralph Laube, and The W7-X Team — Max-Planck-Institute for Plasma Physics, Wendelsteinstr. 1, 17491 Greifswald, Germany

The X-ray multi-camera tomography system (XMCTS) has been commissioned in the stellarator experiment Wendelstein 7-X (W7-X) during operational phase 1.2a (Aug-Dec 2017). The current setup of the diagnostic consists of 18 pinhole cameras arranged on a poloidal array at a toroidal position with up-down symmetric triangular shaped flux surfaces. The emissivity of the plasma in the X-ray range (1−10 keV) is measured along 324 lines-of-sight covering the poloidal cross section up to the last closed flux surface with a spatial resolution of ≈ 3−4  cm. The data acquisition system is commissioned to record 384 channels sampled with 2 MHz at a data rate of 1.6 GB/s capable of recording discharges of 300 s length. First experimental results of X-ray emission obtained during well-defined laser blow-off experiments and gas puffs using different materials and gases are presented. To calculate the 2D emissivity profiles for different magnetic field configurations the preparations for tomographic reconstruction and calibration are discussed.