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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).

Additional information

Authors: CORDEY J G et al, UKAEA Association Euratom, Culham (GB)
Bibliographic Reference: An article published in: Nuclear Fusion 45 (2005), pp. 1078-1084
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