Bochum 2015 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 12: Helmholtz Graduate School for Plasma Physics I
P 12.4: Fachvortrag
Dienstag, 3. März 2015, 15:15–15:40, HZO 50
Computer simulations of the Scraper Element for the nuclear fusion experiment Wendelstein 7-X — •Hauke Hölbe, Thomas Sunn Pedersen, Joachim Geiger, Sergey Bozhenkov, and Yühe Feng — Max Planck Institute for Plasma Physics, Wendelsteinstr. 1, 17491 Greifswald, Germany
The nuclear fusion experiment Wendelstein 7-X (W7-X), located in Greifswald (Germany), will go into operation in a few months (summer 2015). Than W7-X will become the world leading stellarator. The stellarator concept is intrinsically capable of steady state operation while other nuclear fusion concepts based on magnetic confinement such as the Tokamak have to operate in pulsed mode.
In W7-X the plasma-wall interaction will take place at a specifically designed region called the divertor. The divertor itself has regions with different heat load capabilities, the most prominent parts can withstand energy fluxes of up to 10MW/m2 in steady state operation (almost the energy flux at the surface of the sun).
Simulations of certain experimental scenarios have shown that the heat flux limit may be exceeded at one special region of the divertor where the cooling capabilities are less strong. There are several options to deal with this challenge. One of them are an additional divertor plate, called the scraper element (SE), that takes up some of the heat load that would otherwise hit and damage the vulnerable region.
The talk is about the effects of an SE in steady state operation as well as the development of new magnetic field configurations to test the SE in an early operational phase.