Dimensionally Correct Power Law Scaling Expressions for L-mode Confinement

  title={Dimensionally Correct Power Law Scaling Expressions for L-mode Confinement},
  author={Kurt S. Riedel},
  journal={arXiv: Plasma Physics},
  • 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… 
Random Coefficient H-mode Confinement Scalings
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.
Influence of the divertor on the L mode confinement in ASDEX
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
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
Development of Density and Temperature Boundary Condition Models in L-mode Tokamak Plasmas
Models for predicting temperature and density at the edge of Low Confinement mode (L-mode) plasmas are developed. It is assumed in this work that the temperature and density at boundary of L-mode
Simulations of current density profile control using lower hybrid current drive in the TdeV Tokamak
The physics basis of a simulation model for lower hybrid current drive (LHCD) is discussed. Issues associated with LH power deposition-wave propagation, mode conversion and cut-offs in toroidal
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
Profile shape parameterization of jet electron temperature and density profiles
The temperature and density profiles of the Joint European Torus (JET) are parametrized using log additive models in the control variables. Predictive error criteria are used to determine which terms
Ion temperature profile simulation of JT-60 and TFTR plasmas with ion temperature gradient mode transport models
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
Tokamak transport based on the 13-moment model
A new model for collisional transport in a tokamak plasma is analysed. This model is obtained from Grad's 2-fluid 13-moment equations by estimating the order of magnitude of the various effects and
The testing of transport models against data
Many different models for energy transport in a tokamak have been tested against subsets of the wealth of data accumulated from tokamak experiments and claimed to describe adequately the data used in


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
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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
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