Wenzel, Uwe; Biedermann, Christoph; Kocsis, Gábor; Szepesi, Tamás; Blackwell, Boyd; Klose, Sören; Knauer, Jens P; Krychowiak, M; Stephey, Laurie A; Schmitz, O.; Harris, Jeffrey H
In the first operational campaign of the Wendelstein 7-X (W7-X) stellarator we observed Marfe-like radiation belts at the plasma edge. We describe and analyze the behaviour of these radiation belts, especially with respect to the high density inside the belt, with a set of suitable diagnostics. We present evidence suggesting that these Marfe-like radiation belts are triggered by a drop of the edge temperature below 30 eV. From this observation we draw the conclusion that the physical cause of...[Show more]
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