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

TY - JOUR

T1 - High confinement/high radiated power H-mode experiments in Alcator C-Mod and consequences for International Thermonuclear Experimental Reactor (ITER) Q=10 operation

AU - Loarte, A.

AU - Hughes, J.W.

AU - Reinke, M.L.

AU - Terry, J.L.

AU - Labombard, B.

AU - Brunner, D.

AU - Greenwald, M.

AU - Lipschultz, B.

AU - Ma, Y.

AU - Wukitch, S.

AU - Wolfe, S.

PY - 2011/5/1

Y1 - 2011/5/1

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=79958846594&partnerID=8YFLogxK

U2 - 10.1063/1.3567547

DO - 10.1063/1.3567547

M3 - Article

AN - SCOPUS:79958846594

SN - 1070-664X

VL - 18

JO - Physics of Plasmas

JF - Physics of Plasmas

IS - 5

ER -