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Features of near and far scrape-off layer heat fluxes on the Wendelstein 7-X inboard limiters

H. Niemann, M.W. Jakubowski, F. Effenberg, S.A. Bozhenkov, B. Cannas, D. Carralero, A. Langenberg, F. Pisano, K. Rahbarnia, L. Rudischhauser2020年被引用 5Nuclear FusionIF 3出版社

The power fall-off length is used as a characteristic dimension to describe the power exhaust in the scrape-off layer (SOL) in magnetic confinement fusion devices. Measurements from the limiter campaign of the stellarator Wendelstein 7-X with inboard limiters are presented with the first-time characterization of the limiter heat loads. Two fall-off regimes are found with a narrow near SOL with power fall-off length in millimeters and a wider far SOL with fall-off lengths of several centimeters. An attempt is made to describe both regimes with a scaling law for plasma with different heating powers and densities. The results confirm the major geometry effects of the connection length on the heat transport predicted by 3D modeling.

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