429 research outputs found
Edge profile stiffness and insensitivity of the density pedestal to neutral fueling in Alcator C-Mod edgetransport barriers
H-mode power threshold reduction in a slot divertor configuration on the Alcator C-Mod tokamak
Ultra-high densities and volume recombination inside the separatrix of the Alcator C-Mod tokamak
Advances in measurement and modeling of the high-confinement-mode pedestal on the Alcator C-Mod tokamak
Turbulence Nonlinearities Shed Light on Geometric Asymmetry in Tokamak Confinement Transitions
A comprehensive study of fully frequency-resolved nonlinear kinetic energy transfer has been performed for the first time in a diverted tokamak, providing new insight into the parametric dependences of edge turbulence transitions. Measurements using gas puff imaging in the turbulent L-mode state illuminate the source of the long known but as yet unexplained "favorable-unfavorable" geometric asymmetry of the power threshold for transition to the turbulence-suppressed H mode. Results from the recently discovered I mode point to a competition between zonal flow (ZF) and geodesic-acoustic modes (GAM) for turbulent energy, while showing new evidence that the I-to-H transition is still dominated by ZFs. The availability of nonlinear drive for the GAM against net heat flux through the edge corresponds very well to empirical scalings found experimentally for accessing the I mode
Characterization of the Pedestal in Alcator C-Mod ELMing H-Modes and Comparison to the EPED Model
The relationship between forest cover and diet quality:a case study of rural southern Malawi
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