High confinement/high radiated power H-mode experiments in Alcator C-Mod and consequences for International Thermonuclear Experimental Reactor (ITER) Q=10 operation

A. Loarte, J.W. Hughes, M.L. Reinke, J.L. Terry, B. Labombard, D. Brunner, M. Greenwald, B. Lipschultz, Y. Ma, S. Wukitch, S. Wolfe

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Experiments in Alcator C-Mod in (Enhanced D-alpha) EDA H-modes with extrinsic impurity seeding (N, Ne, and Ar) have demonstrated a direct correlation between plasma energy confinement and edge power flow, achieving values of H≥1 for edge power flows only marginally exceeding the scaled power for access to H-mode confinement in these conditions. For lower Z impurity seeding (N and Ne), plasmas with high energy confinement are obtained with a radiative power fraction of 85 or larger and a reduction of the peak heat flux at the divertor by more than a factor of 5 compared to similar attached conditions. The H-mode plasmas thus achieved in Alcator C-Mod meet or exceed the requirements both in terms of divertor heat flux handling and energy confinement for ITER Q 10 operation and with an edge power flow only marginally above the H-mode threshold power (by 1.0-1.4) as expected in ITER.
Original languageEnglish
JournalPhysics of Plasmas
Issue number5
Publication statusPublished - 1 May 2011

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