Performance and properties of the first plasmas of Wendelstein 7-X

Klinger, Thomas; Alonso, A.; Bozhenkov, S.; Burhenn, R.; Dinklage, A.; Fuchert, G.; Geiger, J.; Grulke, O.; Langenberg, A.; Hirsch, M.; Kocsis, G.; Knauer, J.; Krämer-Flecken, A.; Laqua, H.; Lazerson, S.; Landreman, M.; Maaßberg, H.; Marsen, S.; Otte, M.; Pablant, N.; Pasch, E.; Rahbarnia, K.; Stange, T.; Szepesi, T.; Thomsen, H.; Traverso, P.; Velasco, J. L.; Wauters, T.; Weir, G.; Windisch, T.

doi:10.1088/0741-3335/59/1/014018

Title: Performance and properties of the first plasmas of Wendelstein 7-X

Journal Article · Tue Oct 18 00:00:00 EDT 2016 · Plasma Physics and Controlled Fusion

DOI:https://doi.org/10.1088/0741-3335/59/1/014018· OSTI ID:1335689

Klinger, Thomas ^[1]; Alonso, A. ^[2]; Bozhenkov, S. ^[1]; Burhenn, R. ^[1]; Dinklage, A. ^[1]; Fuchert, G. ^[1]; Geiger, J. ^[1]; Grulke, O. ^[1]; Langenberg, A. ^[1]; Hirsch, M. ^[1]; Kocsis, G. ^[3]; Knauer, J. ^[1]; Krämer-Flecken, A. ^[4]; Laqua, H. ^[1]; Lazerson, S. ^[5]; Landreman, M. ^[6]; Maaßberg, H. ^[1]; Marsen, S. ^[1]; Otte, M. ^[1]; Pablant, N. ^[5] more »

Max-Planck Institute for Plasma Physics, Greifswald (Germany)
CIEMAT, Madrid (Spain)
Wigner Research Center for Physics, Budapest (Hungary)
Research Center Julich, Julich (Germany)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Univ. of Maryland, College Park, MD (United States)
Auburn Univ., Auburn, AL (United States)
LPP-ERM/KMS, Brussels (Belgium)

The optimized, superconducting stellarator Wendelstein 7-X went into operation and delivered first measurement data after 15 years of construction and one year commissioning. Errors in the magnet assembly were confirmend to be small. Plasma operation was started with 5 MW electron cyclotron resonance heating (ECRH) power and five inboard limiters. Core plasma values of $${{T}_{\text{e}}}>8$$ keV, $${{T}_{\text{i}}}>2$$ keV at line-integrated densities $$n\approx 3\centerdot {{10}^{19}}~{{\text{m}}^{-2}}$$ were achieved, exceeding the original expectations by about a factor of two. Indications for a core-electron-root were found. The energy confinement times are in line with the international stellarator scaling, despite unfavourable wall conditions, i.e. large areas of metal surfaces and particle sources from the limiter close to the plasma volume. Well controlled shorter hydrogen discharges at higher power (4 MW ECRH power for 1 s) and longer discharges at lower power (0.7 MW ECRH power for 6 s) could be routinely established after proper wall conditioning. Lastly, the fairly large set of diagnostic systems running in the end of the 10 weeks operation campaign provided first insights into expected and unexpected physics of optimized stellarators.

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Research Organization:: Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE

Contributing Organization:: The Wendelstein 7-X Team

Grant/Contract Number:: 633053

OSTI ID:: 1335689

Journal Information:: Plasma Physics and Controlled Fusion, Vol. 59, Issue 1; ISSN 0741-3335

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 90 works

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References (15)

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Magnetic configuration effects on the Wendelstein 7-X stellarator Dinklage, A.; Beidler, C. D.; Helander, P. Nature Physics, Vol. 14, Issue 8 https://doi.org/10.1038/s41567-018-0141-9	journal	May 2018
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Title: Performance and properties of the first plasmas of Wendelstein 7-X

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