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A recently developed reduced model of H-mode sustainment based oninterchange-drift-Alfv\'en turbulence description in the vicinity of theseparatrix matching experimental observations in ASDEX Upgrade has beenextended to experiments with the unfavorable $\nabla B$ drift. The combinationwith the theory of the magnetic-shear-induced Reynolds stress offers apossibility to quantitatively explain the phenomena. The extension of theReynolds stress estimate in the reduced model via the magnetic shearcontribution is able to reproduce the strong asymmetry in the access conditionsdepending on the ion $\nabla B$ drift orientation in agreement withexperimental observations. The Reynolds stress profile asymmetry predicted bythe magnetic shear model is further extended by comparison with GRILLIX andGENE-X simulations matched with comparable experiments in realistic X-pointgeometry. The predictions of the radial electric field well depth and itsdifference between the favorable and unfavorable configurations at the sameheating power from the extended model also show consistency with experimentalmeasurements.

Reduced model for H-mode sustainment in unfavorable $\mathbf{ \nabla B}$ drift configuration in ASDEX Upgrade