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Europhysics news

Laser-Cooled Ion Crystals

G. Birkl, S. Kassner, HERBERT WALTHER

Published Jan 1, 1992• 14 citations
Publisher

Abstract

The crystal-like structures of laser-cooled ions predicted by molecular dynamics calculations and recently observed In a miniature quadrupole storage ring have far-reaching implications.
DOI
10.1051/epn/19922308143

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The crystallization of ion beams has recently been established in the rf quadrupole storage ring PALLAS (PAul Laser CooLing Acceleration System) for laser-cooled 24 Mg + ion beams at an energy of about 1 eV. Yet, unexpectedly sharp constraints had to be met concerning the confinement strength and the longitudinal laser cooling rate. In this paper, related and up to now unseen heating mechanisms are pinpointed for crystalline beams. The weak but inevitable diffusive transverse heating associated with the laser cooling process itself is investigated, possibly allowing the future measurement of the latent heat of the ion crystal. As a function of the beam velocity, the influence of bending shear on the attainability of larger crystalline structures is presented. Finally, rf heating of crystalline beams of different structure is studied for discontinuous cooling.