Beam dynamics and laser cooling of stored ions

The storage ring ASTRID is built for studies in atomic physics, collision physics and laser physics. Beams have been laser cooled to temperature below 1 mK and beam dynamics studied by laser spectroscopy. The role of transverse excitations has been investigated and parameters determining onset of condensation studied. Rf‐laser double resonance spectroscopy has been performed and strict limits put on the requirements for coherent Ramsey‐spectroscopy.