Experimental Observation of the Shear Alfven Resonance in a Tokamak
F. D. Witherspoon, S. C. Prager, and J. C.
Department of Physics, University
of Wisconsin, Madison, Wisconsin 53706
(Received 18 May 1984)
Experiments in Tokapole II demonstrate the shear Alfven resonance in a
tokamak by direct probe measurement of the wave magnetic field within the
plasma. The resonance is driven by external antennas and is identified
as radially localized enhancements of the poloidal wave magnetic field.
The radial location agrees with calculations which include toroidicity
and noncircularity of the plasma cross section. Other properties such as
polarization, radial width, rise time, and wave enhancement also agree
with magnetohydrodynamical theory.
Ref: F. D. Witherspoon, S. C. Prager, and J. C.
Sprott, Phys. Rev. Lett. 53, 1559-1562 (1984)
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