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Scaling of the energy confinement time with β and collisionality approaching ITER conditions

Journal Article · · Nuclear Fusion
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  1. UKAEA Association Euratom, Culham (United Kingdom)
  2. EFDA-JET, Culham (United Kingdom) or Garching (Germany)
  3. Nuclear Fusion Inst., Russian Research Centre Kurchatov Inst., Moscow (Russia)
  4. Max-Planck Institut für Plasmaphysik, Garching (Germany)
  5. Naka Fusion Research Establishment, Japan Atomic Energy Research Inst., Naka (Japan)
  6. MIT Plasma Science and Fusion Center, Cambridge, MA (United States)
  7. General Atomics, San Diego, CA (United States)
  8. Associazione Euratom-ENEA sulla fusione, Frascati (Italy)
  9. South Western Inst. of Physics, Chengdu (People’s Republic of China)
  10. Princeton Plasma Physics Laboratory, Princeton, NJ (United States)
  11. FOM Instit. voor Plasmafisica, Rijnhuizen, Nieuwegein (The Netherlands)
  12. EPFL/CRPP Association Euratom, Lausanne (Switzerland)
  13. Centre Canadien de Fusion Magnetique, Varennes, Quebec (Canada)
  14. LPP/ERM-KMS, Association EURATOM-Belgium State, Brussels (Belgium)
  15. Association Euratom-CEA, CEA de Cadarache, St Paul lez Durance (France)
  16. A.F. Ioffe Instit., Russian Academy of Sciences, St Petersburg (Russia)
+ Show Author Affiliations
The condition of the latest version of the ELMy H-mode database has been re-examined. It is shown that there is bias in the ordinary least squares regression for some of the variables. To address these shortcomings three different approaches are employed: (a) principal component regression, (b) an error in variables technique and (c) the selection of a better conditioned dataset with fewer variables. Scalings in terms of the dimensionless physics variables and the standard set of engineering variables are also derived. The new scalings show a very similar performance for existing scalings for ITER at the standard βn of 1.6, but a much improved performance at higher βn.
Sponsoring Organization:
USDOE; United Kingdom Engineering and Physical Sciences Research Council; EURATOM.
OSTI ID:
1170972
Journal Information:
Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 9 Vol. 45; ISSN 0029-5515
Publisher:
IOP Science
Country of Publication:
United States
Language:
English

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Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Nuclear Physics
Plasma Physics