Bremen 2017 – scientific programme

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P: Fachverband Plasmaphysik

P 9: Magnetic Confinement I

P 9.4: Talk

Tuesday, March 14, 2017, 09:55–10:10, HS 2010

Comissioning of the soft X-ray tomography system (XMCTS) in the Wendelstein 7-X stellarator — •Christian Brandt, Henning Thomsen, Torsten Broszat, Ralph Laube, Mirko Marquardt, Mathias Schülke, Thomas Sieber, Sven Weißflog, and and the W7-X Team — Max-Planck-Institute for Plasma Physics, Wendelsteinstr. 1, 17491 Greifswald, Germany

The soft X-ray multi-camera tomography system (XMCTS) has been assembled and installed inside the W7-X vacuum vessel. The commissioning is scheduled for the upcoming operation phase (OP1.2a). Twenty pinhole cameras aligned on a poloidal circumference measure the plasma radiation in the soft X-ray range (>1 keV) with 18 lines-of-sight each (360 in total). The preamplifier electronics is located directly behind the silicone photodiode arrays within the actively water-cooled camera housings. By tomographic reconstruction the radiation distribution of the poloidal cross section inside the LCFS will be obtained with a spatial resolution of ≈ 2 cm. The foreseen sample frequency of 2 MHz enables the detection of MHD modes up to 800 kHz. In addition the XMCTS will provide insights into the spatiotemporal dynamics of impurities and the quality of the plasma confinement (Shafranov shift). Ongoing work is the preparation of the control and data acquisition systems. The data rate will be 1.6 GB/s and for the later planned long pulse plasmas ≈   3  TB per 30 minutes.