Laser cooling of {sup 24}Mg{sup +} in the ASTRID storage ring

J. S. Nielsen, Jeffrey Scott Hangst, Ove Poulsen, Shi, P., J. P. Schiffer, B. Wanner

Published May 1, 1994• 0 citations

Abstract

Laser cooling of {sup 24}Mg{sup +} has now begun at the ASTRID storage ring. In contrast to {sup 7}Li{sup +}, which has been used up to now, it is now possible for the laser to interact with all of the beam. In this paper some of the results from the first beam time with {sup 24}Mg{sup +} are described. By frequency chirping a single laser, laser cooling has been performed on a coasting beam, and first evidence of sympathetic transverse cooling has been observed.

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Published May 1, 1994• 0 citations

OpenAlex

Abstract

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Laser Cooling of

^{24}

^{+}

in the ASTRID Storage Ring

We have performed laser cooling of Mg

{}^{+}

ions confined in a Penning trap. The externally produced ions were captured in flight, stored, and laser cooled. Laser-induced fluorescence was observed perpendicular to the cooling laser axis. Optical detection down to the single-ion level together with the electronic detection of the ion oscillations inside the Penning trap have been used to acquire information on the ion storage time, ion number, and ion temperature. Evidence for the formation of ion crystals has been observed. These investigations are an important prerequisite for the sympathetic cooling of simultaneously stored highly charged ions and the precision laser spectroscopy of forbidden transitions in these.

^{9}\mathrm{Be}^{+}

beam with an initial longitudinal temperature of 2700 K, the main characteristics of laser cooling in a storage ring are discussed. When undamped, the transverse betatron oscillations of the coasting ions limit the longitudinal temperature after laser cooling to typically 1 K. After damping the transverse motion by precooling the ions with an electron cooler, longitudinal temperatures of below 30 mK have been obtained in the subsequent laser cooling. In this case, the longitudinal ion-beam temperature can be understood as an equilibrium of the laser cooling rate with the heating rate due to intrabeam scattering. Moreover, single binary Coulomb collisions between the (still transversely hot) ions can cause such longitudinal velocity changes that ions are lost out of the critical capture range of the laser cooling force. In these two ways, intrabeam scattering imposes a substantial limit on the temperature or number of laser cooled ions in a storage ring. In our experiments, this process presently limits the ratio between the density-dependent Coulomb energy and the longitudinal thermal energy spread to a value on the order of 1, where liquid rather than gaseous behavior of the ion beam is expected to set in.