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Current precision experiments with single (anti)protons to test CPT symmetryprogress at a rapid pace, but are complicated by the need to cool particles tosub-thermal energies. We describe a cryogenic Penning-trap setup for $^9$Be$^+$ions designed to allow coupling of single (anti)protons to laser-cooled atomicions for sympathetic cooling and quantum logic spectroscopy. We report ontrapping and laser cooling of clouds and single $^9$Be$^+$ ions. We discussprospects for a microfabricated trap to allow coupling of single (anti)protonsto laser-cooled $^9$Be$^+$ ions for sympathetic laser cooling to sub-mKtemperatures on ms time scales.

Cryogenic Penning-Trap Apparatus for Precision Experiments with Sympathetically Cooled (anti)protons