Dimensionally Correct Power Law Scaling Expressions for L-mode Confinement

@article{Riedel1991DimensionallyCP,
  title={Dimensionally Correct Power Law Scaling Expressions for L-mode Confinement},
  author={Kurt S. Riedel},
  journal={arXiv: Plasma Physics},
  year={1991},
  pages={927-941}
}
  • K. Riedel
  • Published 1 May 1991
  • Physics, Computer Science
  • arXiv: Plasma Physics
Confinement scalings of divertor and radiofrequency heated discharges are shown to differ significantly from the standard neutral beam heated limiter scaling. 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. We find a scaling similar to Goldston scaling for the NB limiter dataset and a scaling similar to ITER89P for the combined dataset. Various missing value algorithms are… 
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Random Coefficient H-mode Confinement Scalings
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References

SHOWING 1-10 OF 10 REFERENCES
Global energy confinement scaling for neutral-beam-heated tokamaks
A total of 677 representative discharges from seven neutral-beam-heated tokamaks have been used to study the parametric scaling of global energy confinement time. Contributions to this data base were…
Uncertainties associated with extrapolating L mode energy confinement to ITER and CIT
The authors apply a two-step tokamak regression procedure to L-mode confinement data. The resulting scaling expression for ?E: is similar to other published scaling expressions. Using the random…
A unified physical scaling law for tokamak energy confinement
From the equations which describe local transport in a turbulent plasma the scaling of the local diffusivity with the plasma parameters can be established. It is shown that, by appropriate choices of…
Status of global energy confinement studies
Empirical scaling expressions, reflecting the parametric dependence of the L‐mode energy confinement time, have been used not only as benchmarks for tokamak operation and theories of energy…
Application of plasma physics constraints to confinement data
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…
Nonlinear gyrokinetic theory, the direct interaction approximation, and anomalous thermal transport in tokamaks
Invariance properties under scale transformations of the nonlinear gyrokinetic Vlasov and heat transport equations are used to examine anomalous thermal transport due to drift wave turbulence. To…
Tokamak to tokamak variation and collinearity in scaling laws
The large multiplicity of scaling laws which almost fit the data is associated with the near degeneracy of the data covariance matrix. The traditional analysis assumes that only discharge to…
Comments in Plasma Physics and Controlled Fusion, Vol
  • XII, No. 6,
  • 1989
Comments on Plasma Physics and COntrolled
  • Nuclear Fusion, Vol. 13,
  • 1989
Multivariate Analysis, Aca
  • 1982