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

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.


Published in:
Nuclear Fusion, 45, 9, 1078-1084
Year:
2005
ISSN:
0029-5515
ISBN:
0029-5515
Keywords:
Other identifiers:
Laboratories:
SPC
CRPP




 Record created 2008-04-16, last modified 2018-01-28


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