
doi: 10.1063/1.35266
Two quarter turn toroidal antennas are mounted in the midplane of the PRETEXT tokamak at the outer radius and located 180° apart toroidally. The currents in the antennas are run with relative phases of 0° and 180°. The tokamak is operated such that an extensive density scan is available on each shot. Magnetic probes located at the plasma edge monitor all rf field components. Global Alfven Eigenmodes are seen as resonances in the antenna resistance and inductance; these modes are also evident as resonances in the magnetic field components. Mode numbers suggested from these measurements and impedance values are compared with theoretical predictions1. CO2 laser interferometer measurements of rf density profiles were present on shots at 2.1 Mhz and were used in mode identification.
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