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).
Bibliographic Reference: An article published in: Nuclear Fusion 45 (2005) 1078�1084
Availability: This article can be accessed online by subscribers, and can be ordered online by non-subscribers, at: stacks.iop.org/NF/45/1078
Record Number: 200518333 / Last updated on: 2005-09-26
Original language: en
Available languages: en