Random Coefficient H-mode Confinement Scalings

Abstract

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 collisional Maxwell-Vlasov constraint at the 10-30% significance level, probably owing to radiation losses. The dimensionally constrained scaling, ${\tau }_E=0.07192M^{1/2}$ $(R/a{)}^{-0.221}{R}^{1.568}{\kappa }^{.3}{I}_p^{.904}{B}_t^{.201}{\bar{n}}^{0.106}{P}^{-0.493}$, is similar to ITER89P with a slightly stronger size dependence.