Scaling of the energy confinement time with beta and collisionality approaching ITER conditions
Cordey, J. G.; Thomsen, K.; Chudnovskiy, A.; Kardaun, Ojwf; Takizuka, T.; Snipes, J. A.; Greenwald, M.; Sugiyama, L.; Ryter, F.; Kus, A.; Stober, J.; DeBoo, J. C.; Petty, C. C.; Bracco, G.; Romanelli, M.; Cui, Z.; Liu, Y.; McDonald, D. C.; Meakins, A.; Miura, Y.; Shinohara, K.; Tsuzuki, K.; Kamada, Y.; Urano, H.; Valovic, M.; Akers, R.; Brickley, C.; Sykes, A.; Walsh, M. J.; Kaye, S. M.; Bush, C.; Hogewei, D.; Martin, Y.; Cote, A.; Pacher, G.; Ongena, J.; Imbeaux, F.; Hoang, G. T.; Lebedev, S.; Leonov, V.
2005

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 beta(n) of 1.6, but a much improved performance at higher beta n.

Details

Title Scaling of the energy confinement time with beta and collisionality approaching ITER conditions
Author(s) Cordey, J. G. ; Thomsen, K. ; Chudnovskiy, A. ; Kardaun, Ojwf ; Takizuka, T. ; Snipes, J. A. ; Greenwald, M. ; Sugiyama, L. ; Ryter, F. ; Kus, A. ; Stober, J. ; DeBoo, J. C. ; Petty, C. C. ; Bracco, G. ; Romanelli, M. ; Cui, Z. ; Liu, Y. ; McDonald, D. C. ; Meakins, A. ; Miura, Y. ; Shinohara, K. ; Tsuzuki, K. ; Kamada, Y. ; Urano, H. ; Valovic, M. ; Akers, R. ; Brickley, C. ; Sykes, A. ; Walsh, M. J. ; Kaye, S. M. ; Bush, C. ; Hogewei, D. ; Martin, Y. ; Cote, A. ; Pacher, G. ; Ongena, J. ; Imbeaux, F. ; Hoang, G. T. ; Lebedev, S. ; Leonov, V.
Published in Nuclear Fusion
Volume 45
Issue 9
Pages 1078-1084
Date 2005
ISSN 0029-5515
Keywords
DOI https://doi.org/10.1088/0029-5515/45/9/007
Other identifier(s) DAR: 7445
View record in Web of Science
Laboratories CRPP
SPC
Record Appears in Scientific production and competences > SB - School of Basic Sciences > SPC - Swiss Plasma Center > SPC - Swiss Plasma Center
Peer-reviewed publications
Work produced at EPFL
Journal Articles
Published
Record creation date 2008-04-16

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