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Title: Confirmation of the topology of the Wendelstein 7-X magnetic field to better than 1:100,000

Fusion energy research has in the past 40 years focused primarily on the tokamak concept, but recent advances in plasma theory and computational power have led to renewed interest in stellarators. The largest and most sophisticated stellarator in the world, Wendelstein 7-X (W7-X), has just started operation, with the aim to show that the earlier weaknesses of this concept have been addressed successfully, and that the intrinsic advantages of the concept persist, also at plasma parameters approaching those of a future fusion power plant. Here we show the first physics results, obtained before plasma operation: that the carefully tailored topology of nested magnetic surfaces needed for good confinement is realized, and that the measured deviations are smaller than one part in 100,000. Lastly, this is a significant step forward in stellarator research, since it shows that the complicated and delicate magnetic topology can be created and verified with the required accuracy.
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Publication Date:
Report Number(s):
LA-UR-17-24754
Journal ID: ISSN 2041-1723; ncomms13493; TRN: US1701194
Grant/Contract Number:
AC02-09CH11466; AC52-06NA25396
Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 7; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Research Org:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
Contributing Orgs:
Max Planck Inst Plasma Phys, Wendelsteinstr 1, D-17491 Greifswald, Germany.; Ernst Moritz Arndt Univ Greifswald, Domstr 11, D-17489 Greifswald, Germany; Tech Univ Berlin, Str 17 Juni 135, D-10623 Berlin, Germany This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014–2018 under grant agreement No 633053.
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; stellarator; surfaces; torsatron; magnetically confined plasmas; nuclear fusion and fission; Magnetic Fusion Energy
OSTI Identifier:
1340114
Alternate Identifier(s):
OSTI ID: 1415401