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

J.G. Cordey, K. Thomsen, A. Chudnovskiy, O.J.W.F. Kardaun, T. Takizuka, J.A. Snipes, M. Greenwald, L. Sugiyama, F. Ryter, A. Kus, J. Stober, J.C. Deboo, C.C. Petty, G. Bracco, M. Romanelli, Z. Cui, Y. Liu, D.C. McDonald, A. Meakins, Y. MiuraK. Shinohara, K. Tsuzuki, Y. Kamada, H. Urano, M. Valovic, R. Akers, C. Brickley, A. Sykes, M.J. Walsh, S.M. Kaye, C. Bush, D. Hogewei, Y. Martin, A. Cote, G. Pacher, J. Ongena, F. Imbeaux, G.T. Hoang, S. Lebedev, V. Leonov

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Abstract

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 techniques 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, as well as the standard set of engineering variables, are also derived. The new scalings give a very similar performance for existing scalings for ITER at the standard βnof 1.6, but a much improved performance at higher βn. © 2005 IAEA, Vienna.
Original languageEnglish
Pages (from-to)1078 - 1084
Number of pages7
JournalNuclear Fusion
Volume45
Issue number9
DOIs
Publication statusPublished - 1 Sep 2005
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

Cite this

Cordey, J. G., Thomsen, K., Chudnovskiy, A., Kardaun, O. J. W. F., Takizuka, T., Snipes, J. A., ... Leonov, V. (2005). Scaling of the energy confinement time with β and collisionality approaching ITER conditions. Nuclear Fusion, 45(9), 1078 - 1084. https://doi.org/10.1088/0029-5515/45/9/007