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We report the precise control of the rotation frequency of strongly coupled non-neutral plasmas by rotating electric fields. These plasmas of up to 10^6 ^9Be^+ ions are trapped in a Penning trap and laser cooled into crystallized structures which undergo a rigid-body rotation. Bragg diffraction shows that the crystalline lattice can be stable for longer than 30 min (10^8 rotations), and that the plasma rotation can be phase locked to the applied field without any slip. These corotating plasmas are in a novel global thermal equilibrium whose asymmetric surface shape (triaxial ellipsoid) has been measured.
Huang et al. (Mon,) studied this question.
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