Erlangen 2018 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 15: Helmholtz Graduate School IV - Plasma Wall Interaction
P 15.2: Vortrag
Mittwoch, 7. März 2018, 14:25–14:50, A 0.112
Developement of Hotspot Detection System for Protection of Plasma Facing Components in Wendelstein 7-X — •Adnan Ali1,3, Marcin Jakubowski1, Henri Greuner2, Thomas Sunn Pedersen1, Rudolf Neu2,3, and W7-X Team1 — 1Max Planck Institute for Plasma Physics, Wendelsteinstrasse 1, 17491 Greifswald — 2Max Planck Institute for Plasma Physics, Boltzmannstrasse 2, 85748 Greifswald — 3Technical University of Munich (TUM), Boltzmannstrasse 15, 85748 Garching
One of the main aims of Wendelstein 7-X, an advanced stellarator, is to investigate the quasi steady state operation of magnetic fusion devices, for which power exhaust is an important issue. A predominant fraction of the energy lost from the confined plasma region will be removed by 10 so-called island divertors, which are designed to sustain maximum heat flux up to 10 MW/m2. A very important prerequisite for safe operation of a steady-state device is an automatic detection of the hot spots and other abnormal events. In this work, we present the experimental results obtained at the high heat flux test facility GLADIS in IPP Garching where we tested the newly developed algorithms for protection of W7-X plasma facing components. Two types of off-normal signals are detected steming either from delaminations formed at the connection between CFC and CuCrZr blocks and hydrocarbon surface layers formed on the material surface. The algorithms designed for early detection of defects was successfully tested in GLADIS and is now implemented in the new detection software for W7-X imaging diagnostic.