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@ARTICLE{Dinklage:862061,
author = {Dinklage, A. and Beidler, C. D. and Helander, P. and
Fuchert, G. and Maaßberg, H. and Rahbarnia, K. and Sunn
Pedersen, T. and Turkin, Y. and Wolf, R. C. and Alonso, A.
and Andreeva, T. and Blackwell, B. and Bozhenkov, S. and
Buttenschön, B. and Czarnecka, A. and Effenberg, F. and
Feng, Y. and Geiger, J. and Hirsch, M. and Höfel, U. and
Jakubowski, M. and Klinger, T. and Knauer, J. and Kocsis, G.
and Krämer-Flecken, A. and Kubkowska, M. and Langenberg, A.
and Laqua, H. P. and Marushchenko, N. and Mollén, A. and
Neuner, U. and Niemann, H. and Pasch, E. and Pablant, N. and
Rudischhauser, L. and Smith, H. M. and Schmitz, O. and
Stange, T. and Szepesi, T. and Weir, G. and Windisch, T. and
Wurden, G. A. and Zhang, D.},
title = {{M}agnetic configuration effects on the {W}endelstein 7-{X}
stellarator},
journal = {Nature physics},
volume = {14},
number = {8},
issn = {1745-2481},
address = {Basingstoke},
publisher = {Nature Publishing Group},
reportid = {FZJ-2019-02425},
pages = {855 - 860},
year = {2018},
abstract = {The 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.},
cin = {IEK-4},
ddc = {530},
cid = {I:(DE-Juel1)IEK-4-20101013},
pnm = {174 - Plasma-Wall-Interaction (POF3-174)},
pid = {G:(DE-HGF)POF3-174},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000440583300022},
doi = {10.1038/s41567-018-0141-9},
url = {https://juser.fz-juelich.de/record/862061},
}