34 papers · 1 filter
Random Coefficient H-mode Confinement Scalings
Kurt S. Riedel
The random coefficient two-stage regression algorithm with the collisional Maxwell-Vlasov constraint is applied to the ITER H-mode confinement database. The data violate the collis…
Dimensionally Correct Power Law Scaling Expressions for L-mode Confinement
Kurt S. Riedel
Confinement scalings of divertor and radiofrequency heated discharges are shown to differ significantly from the standard neutral beam heated limiter scaling. The random coefficien…
Quasi-linear Transport in a Sheared Flow Field
Kurt S. Riedel
The evolution of a passive scalar field is considered for a slowly varying stratified medium, which is convected in an incompressible sheared flow with many overlapping static flux…
Spectral Estimation of Plasma Fluctuations I: Comparison of Methods
Kurt S. Riedel, Alexander Sidorenko, David J. Thomson
The relative root mean squared errors (RMSE) of nonparametric methods for spectral estimation is compared for microwave scattering data of plasma fluctuations. These methods reduce…
Spectral Estimation of Plasma Fluctuations II: Nonstationary Analysis of ELM Spectra
Kurt S. Riedel, Alexander Sidorenko, Norton Bretz +1
Several analysis methods for nonstationary fluctuations are described and applied to the edge localized mode (ELM) instabilities of limiter H-mode plasmas. The microwave scattering…
Minimum bias multiple taper spectral estimation
Kurt S. Riedel, Alexander Sidorenko
Two families of orthonormal tapers are proposed for multi-taper spectral analysis: minimum bias tapers, and sinusoidal tapers , where $v_n^{(k)}=\sqrt{\frac{2}{N…