Berlin 2014 – scientific programme
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P: Fachverband Plasmaphysik
P 16: Helmholtz Graduate School for Plasma Physics I
P 16.4: Topical Talk
Wednesday, March 19, 2014, 15:15–15:40, SPA HS202
Algorithm development for safeguarding the Wendelstein 7-X divertor during steady state operation — •A. Rodatos2, M. Jakubowski2, H. Greuner1, G. A. Wurden3, and T. Sunn Pedersen1 — 1Max-Planck-Institut für Plasmaphysik, Boltzmannstraße 2, D-85748 Garching — 2Max-Planck-Institut für Plasmaphysik, Wendelsteinstraße 1, D-17491 Greifswald — 3Los Alamos National Laboratory, Los Alamos, NM 87544 USA
The divertor of Wendelstein 7X is designed to withstand steady state heat fluxes of 10 MW/m2 and 15 MW/m2 transiently [1]. However higher local heat fluxes are possible. 10 thermographic infrared (IR) observation systems will be installted to monitor the divertor and its center goal is the detection of overheated areas in real time. Besides an increased plasma heat flux, there are at least two potential causes of an elevated diverter surface temperature. First redeposited eroded material forming surface layers with a poor thermal connection to the underlying water-cooled tiles [2]. Second, delaminated CFC tiles will exhibit an elevated surface temperature relative to properly bonded tiles. Using the measured characteristic time scales for the thermal response, gained from experiments at GLADIS[3], we have concluded that it is possible to distinguish between healthy, delaminated, surface-coated and delaminated surface-coated tiles.
[1] H. Greuner, et al., Fusion Technology Vol. 1 (1998) 249
[2] A. Herrmann, et al., Phys. Scr. T128 (2007) 234
[3] H. Greuner, et al., J. Nucl. Mater. 367-370 (2007) 1444