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000862061 1001_ $$00000-0002-5815-8463$$aDinklage, A.$$b0$$eCorresponding author
000862061 245__ $$aMagnetic configuration effects on the Wendelstein 7-X stellarator
000862061 260__ $$aBasingstoke$$bNature Publishing Group$$c2018
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000862061 520__ $$aThe two leading concepts for confining high-temperature fusion plasmas are the tokamak and the stellarator. Tokamaks are rotationally symmetric and use a large plasma current to achieve confinement, whereas stellarators are non-axisymmetric and employ three-dimensionally shaped magnetic field coils to twist the field and confine the plasma. As a result, the magnetic field of a stellarator needs to be carefully designed to minimize the collisional transport arising from poorly confined particle orbits, which would otherwise cause excessive power losses at high plasma temperatures. In addition, this type of transport leads to the appearance of a net toroidal plasma current, the so-called bootstrap current. Here, we analyse results from the first experimental campaign of the Wendelstein 7-X stellarator, showing that its magnetic-field design allows good control of bootstrap currents and collisional transport. The energy confinement time is among the best ever achieved in stellarators, both in absolute figures (τE > 100 ms) and relative to the stellarator confinement scaling. The bootstrap current responds as predicted to changes in the magnetic mirror ratio. These initial experiments confirm several theoretically predicted properties of Wendelstein 7-X plasmas, and already indicate consistency with optimization measures.
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000862061 7001_ $$0P:(DE-HGF)0$$aRahbarnia, K.$$b5
000862061 7001_ $$0P:(DE-HGF)0$$aSunn Pedersen, T.$$b6
000862061 7001_ $$0P:(DE-HGF)0$$aTurkin, Y.$$b7
000862061 7001_ $$00000-0002-2606-5289$$aWolf, R. C.$$b8
000862061 7001_ $$0P:(DE-HGF)0$$aAlonso, A.$$b9
000862061 7001_ $$00000-0003-2390-4240$$aAndreeva, T.$$b10
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000862061 7001_ $$0P:(DE-HGF)0$$aGeiger, J.$$b17
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000862061 7001_ $$00000-0003-0971-5937$$aHöfel, U.$$b19
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000862061 7001_ $$0P:(DE-HGF)0$$aLaqua, H. P.$$b27
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000862061 7001_ $$00000-0002-9257-7864$$aMollén, A.$$b29
000862061 7001_ $$aNeuner, U.$$b30
000862061 7001_ $$aNiemann, H.$$b31
000862061 7001_ $$aPasch, E.$$b32
000862061 7001_ $$00000-0001-6617-8459$$aPablant, N.$$b33
000862061 7001_ $$00000-0002-3696-7067$$aRudischhauser, L.$$b34
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000862061 7001_ $$0P:(DE-HGF)0$$aStange, T.$$b37
000862061 7001_ $$0P:(DE-HGF)0$$aSzepesi, T.$$b38
000862061 7001_ $$00000-0002-2370-409X$$aWeir, G.$$b39
000862061 7001_ $$0P:(DE-HGF)0$$aWindisch, T.$$b40
000862061 7001_ $$00000-0003-2991-1484$$aWurden, G. A.$$b41
000862061 7001_ $$0P:(DE-Juel1)145222$$aZhang, D.$$b42$$ufzj
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