Ellipsoidal Coulomb Crystals in a Linear Radiofrequency Trap

Details Ellipsoidal Coulomb Crystals in a Linear Radiofrequency Trap Ellipsoidal Coulomb Crystals in a Linear Radiofrequency Trap

2004-12-09

arxiv.org/abs/physics/0412054v1

Physics

Plasma Physics

4 pages, 3 figures

Scientific paper

10.1063/1.1976605

A static quadrupole potential breaks the cylindrical symmetry of the effective potential of a linear rf trap. For a one-component fluid plasma at low temperature, the resulting equilibrium charge distribution is predicted to be an ellipsoid. We have produced laser-cooled Be$^+$ ellipsoidal ion crystals and found good agreement between their shapes and the cold fluid prediction. In two-species mixtures, containing Be$^+$ and sympathetically cooled ions of lower mass, a sufficiently strong static quadrupole potential produces a spatial separation of the species.

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