# Uncertainties associated with extrapolating L-mode energy confinement to ITER and CIT

@article{Riedel1990UncertaintiesAW, title={Uncertainties associated with extrapolating L-mode energy confinement to ITER and CIT}, author={Kurt S. Riedel and S M Kaye}, journal={Nuclear Fusion}, year={1990}, volume={30}, pages={731 - 742} }

The authors apply a two-step tokamak regression procedure to L-mode confinement data. The resulting scaling expression for τE: is similar to other published scaling expressions. Using the random coeffcient model, tokamak-to-tokamak variations are included in the estimate of the uncertainty. The uncertainty factor in the predicted confinement times is calculated to be 19% for ITER and 35% for CIT. The confinement uncertainties are dominated by the propagation of uncertainties arising from the…

## 14 Citations

Scalings for Tokamak Energy Confinement

- Physics, Computer ScienceArXiv
- 2019

Two new scaling expressions for tokamak L-mode energy confinement are proposed, namely a power law scaling and an offset-linear scaling, which can be transformed to forms very close to most of the common scaling expressions.

Dimensionality correct power law scaling expressions for L-mode confinement

- Physics, Computer Science
- 1991

The random coefficient two-stage regression algorithm is applied to a neutral beam heated limiter subset of the ITER L-mode database as well as a combined dataset and a scaling similar to the Goldston scaling is found for the neutral beam limiter dataset.

Interval estimation of global H-mode energy confinement in ITER

- Physics
- 1999

This paper treats some fundamental and practical aspects of interval estimation of the prospective thermal H-mode confinement time in ITER. Some basic definitions of an interval estimate are given…

Extrapolation of tokamak energy confinement to Next Step Devices

- Physics
- 1990

The extrapolation of energy confinement to the conditions of a Next Step tokamak, to operate with an ignited DT plasma, is an essential ingredient of the data base needed for such a device. The…

Application of plasma physics constraints to confinement data

- Physics
- 1991

A subset of the ITER L-mode and H-mode confinement data is tested against the constraints imposed by various theoretical models for thermal plasma transport. Matrix algebra is used to facilitate such…

β scaling of confinement

- Physics
- 1998

Empirical scaling laws (Goldston, Kaye-Goldston, ITER89P and ITER93H) for the confinement time τE in tokamaks depend on dimensionless global plasma parameters in a way which is difficult to associate…

Influence of the divertor on the L mode confinement in ASDEX

- Physics
- 1995

Results of confinement studies on an L mode database covering 10 years of operation of ASDEX are presented. During this time, the ASDEX divertor was modified several times. Scaling expressions for…

III. CONFINEMENT

- Physics
- 2002

The problem of projecting the energy confinement properties of future devices is a long-standing one in toroidal confinement research. While substantial progress has been made in characterizing the…

Random Coefficient H-mode Confinement Scalings

- Physics, Computer Science
- 1992

The random coefficient two-stage regression algorithm with the collisional Maxwell-Vlasov constraint is applied to the ITER H-mode confinement database, and the data violate the collisionals at the 10-30% significance level, probably owing to radiation losses.

Ion temperature profile simulation of JT-60 and TFTR plasmas with ion temperature gradient mode transport models

- Physics
- 1994

Ion temperature profiles of neutral beam heated plasmas in JT-60 and TFTR have been simulated using models of ion thermal diffusivity, χi, based on ion temperature gradient mode (ηi mode) turbulence…

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