Abstract
It is demonstrated that radio-frequency (rf) waves applied below the ion cyclotron frequency (ω/Ωi≊0.75) can stabilize a mirror plasma against the interchange instability. A set of phased antennas in the Phaedrus-B tandem mirror central cell [Phys. Rev. Lett. 59, 206 (1987)] is used to select the rf azimuthal mode number (m). When the m=−1 mode is selected, the ponderomotive force from the left-hand polarized wave fields is sufficient to stabilize the plasma. Measurements of the rf mode number and of the wave polarization indicate strong excitation of m=−1 modes with much of the wave having a left-hand polarization.
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