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Title: Confinement in Wendelstein 7-X Limiter Plasmas

Observations on confinement in the first experimental campaign on the optimized Stellarator Wendelstein 7-X are summarized. In this phase W7-X was equipped with five inboard limiters only and thus the discharge length restricted to avoid local overheating. Stationary plasmas are limited to low densities <2–3 centerdot 10 19 m -3. With the available 4.3 MW ECR Heating core T e ~ 8 keV, T i ~ 1–2 keV are achieved routinely resulting in energy confinement time τ E between 80 ms to 150 ms. For these conditions the plasmas show characteristics of core electron root confinement with peaked T e-profiles and positive E r up to about half of the minor radius. Lastly, profiles and plasma currents respond to on- and off-axis heating and co- and counter ECCD respectively.
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  1. Max Planck Inst. for Plasma Physics, Greifswald (Germany)
  2. Research Centre for Energy, Environment and Technology (CIEMAT), Madrid (Spain)
  3. Inst. of Plasma Physics and Laser Microfusion (IPPLM), Warsaw (Poland)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  5. Hungarian Academy of Sciences, Budapest (Hungary). Wigner Inst.
  6. Forschungszentrum Julich (Germany)
  7. Opole Univ. (Poland)
  8. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  9. Alternative Energies and Atomic Energy Commission (CEA), Cadarache (France)
  10. Univ. of Cagliari (Italy)
  11. Univ. of Wisconsin, Madison, WI (United States)
  12. National Inst. for Fusion Science (NIFS), Toki (Japan)
  13. Ecole Royale Militaire, Koninklijke Militaire School (ERM-KMS), Brussels (Belgium). Lab. for Plasma Physics
  14. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Report Number(s):
LA-UR-16-27307
Journal ID: ISSN 0029-5515
Grant/Contract Number:
AC52-06NA25396; 633053
Type:
Accepted Manuscript
Journal Name:
Nuclear Fusion
Additional Journal Information:
Journal Volume: 57; Journal Issue: 8; Conference: 26. IAEA Fusion Energy Conference , Kyoto (Japan), 17-22 Oct 2016; Journal ID: ISSN 0029-5515
Publisher:
IOP Science
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org:
USDOE Office of Science (SC). Fusion Energy Sciences (FES) (SC-24); European Union (EU); USDOE
Contributing Orgs:
EUROfusion Consortium; Wendelstein Team (W7-X); the W7-X Team
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Magnetic Fusion Energy; Wedelstein 7-X, stellarator, fusion, energy balance, particle confinement
OSTI Identifier:
1369186
Alternate Identifier(s):
OSTI ID: 1375764