Abstract
Toroidal magnetohydrodynamic (MHD) simulations demonstrate that sheared poloidal flows in tokamaks can be generated by the resonant excitation of the geodesic acoustic mode (GAM). Poloidal flows are generated by two resonant excitation methods: oscillating currents in an external coil and an oscillating heat source. The coil current and the heat source oscillate in time at the local GAM frequency. The sheared poloidal flow generated by the excitation of the GAM may be useful for the suppression of plasma instabilities.
This research was supported by the U.S. Department of Energy.
I. INTRODUCTION
II. EQUATIONS
III. GEODESIC ACOUSTIC MODE
IV. RESONANTMAGNETIC FIELD
V. RESONANT HEATING
VI. DISCUSSION
Key Topics
 Magnetic fields
 22.0
 Plasma flows
 21.0
 Toroidal plasma confinement
 18.0
 Coils
 16.0
 Magnetic resonance
 11.0
Figures
Density perturbation. The density perturbation is plotted in the poloidal (R, z) plane. The yellow to red region corresponds to an increasingly positive density perturbation, the blue to purple region corresponds to an increasingly negative density perturbation, and the density perturbation is zero in the green region.
Density perturbation. The density perturbation is plotted in the poloidal (R, z) plane. The yellow to red region corresponds to an increasingly positive density perturbation, the blue to purple region corresponds to an increasingly negative density perturbation, and the density perturbation is zero in the green region.
Oscillating density perturbation. The temporal dependence of the density perturbation at (R = 3, z = 0.44) is plotted when the safety factor q _{0} on axis is (a) 1.2 and (b) 0.3.
Oscillating density perturbation. The temporal dependence of the density perturbation at (R = 3, z = 0.44) is plotted when the safety factor q _{0} on axis is (a) 1.2 and (b) 0.3.
Poloidal flow speed generated by oscillating coil currents. The temporal dependence of the poloidal flow speed V_{pol} on the midplane (z = 0) at R = 3.65 is plotted for coil current J_{coil} = (a) 0.2, (b) 1, and (c) 5.
Poloidal flow speed generated by oscillating coil currents. The temporal dependence of the poloidal flow speed V_{pol} on the midplane (z = 0) at R = 3.65 is plotted for coil current J_{coil} = (a) 0.2, (b) 1, and (c) 5.
Poloidal flow generated by oscillating coil currents. The poloidal flow speed V_{pol} when is plotted in the poloidal (R, z) plane at t = 1200. The yellow to red region corresponds to an increasing clockwise flow, the blue region is a region of smaller counterclockwise flow, and the flow is zero in the green region. The maximum value of V_{pol} in the red region is given by the peak in the temporal oscillation shown in Fig. 3(c) at t = 1200.
Poloidal flow generated by oscillating coil currents. The poloidal flow speed V_{pol} when is plotted in the poloidal (R, z) plane at t = 1200. The yellow to red region corresponds to an increasing clockwise flow, the blue region is a region of smaller counterclockwise flow, and the flow is zero in the green region. The maximum value of V_{pol} in the red region is given by the peak in the temporal oscillation shown in Fig. 3(c) at t = 1200.
Poloidal flow speed generated by oscillating coil currents at . The temporal dependence of the poloidal flow speed V_{pol} on the midplane (z = 0) at R = 3.65 is plotted for coil current J_{coil} = 5.
Poloidal flow speed generated by oscillating coil currents at . The temporal dependence of the poloidal flow speed V_{pol} on the midplane (z = 0) at R = 3.65 is plotted for coil current J_{coil} = 5.
Poloidal flow generated by oscillating coil currents at . The poloidal flow speed V_{pol} when is plotted in the poloidal (R, z) plane at t = 2826. The yellow to red region corresponds to an increasing clockwise flow, the blue region is a region of smaller counterclockwise flow, and the flow is zero in the green region. The maximum value of V_{pol} in the red region is given by the peak in the temporal oscillation shown in Fig. 5 at t = 2826.
Poloidal flow generated by oscillating coil currents at . The poloidal flow speed V_{pol} when is plotted in the poloidal (R, z) plane at t = 2826. The yellow to red region corresponds to an increasing clockwise flow, the blue region is a region of smaller counterclockwise flow, and the flow is zero in the green region. The maximum value of V_{pol} in the red region is given by the peak in the temporal oscillation shown in Fig. 5 at t = 2826.
Poloidal flow speed generated by an oscillating heat source. The temporal dependence of the poloidal flow speed V_{pol} on the midplane (z = 0) at R = 3.56 is plotted for heating amplitude A = (a) 0.02, (b) 0.1, and (c) 0.4.
Poloidal flow speed generated by an oscillating heat source. The temporal dependence of the poloidal flow speed V_{pol} on the midplane (z = 0) at R = 3.56 is plotted for heating amplitude A = (a) 0.02, (b) 0.1, and (c) 0.4.
Poloidal flow generated by an oscillating heat source. The poloidal flow speed V_{pol} when A = 0.4 is plotted in the poloidal (R, z) plane at t = 1458. The yellow to red region corresponds to an increasing clockwise flow, and the flow is zero in the green region. The maximum value of V_{pol} in the red region is given by the peak in the temporal oscillation shown in Fig. 7(c) at t = 1458.
Poloidal flow generated by an oscillating heat source. The poloidal flow speed V_{pol} when A = 0.4 is plotted in the poloidal (R, z) plane at t = 1458. The yellow to red region corresponds to an increasing clockwise flow, and the flow is zero in the green region. The maximum value of V_{pol} in the red region is given by the peak in the temporal oscillation shown in Fig. 7(c) at t = 1458.
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