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Thorium ions exhibit unique nuclear properties with high relevance fortesting symmetries of nature, and Paul traps feature an ideal experimentalplatform for performing high precision quantum logic spectroscopy. Loading ofstable or long-lived isotopes is well-established and relies on ionization froman atomic beam. A different approach allows trapping short-lived isotopesavailable as alpha-decay daughters, which recoil from a thin sample of theprecursor nuclide. A prominent example is the short-lived $^{229\text{m}}$Th,populated in a decay of long-lived $^{233}$U. Here, ions are provided by anexternal source and are decelerated to be available for trapping. Such setupsoffer the option to trap various isotopes and charge states of thorium.Investigating this complex procedure, we demonstrate the observation of single$^{232}$Th$^+$ ions trapped, embedded into and sympathetically cooled viaCoulomb interactions by co-trapped $^{40}$Ca$^+$ ions. Furthermore, we discussdifferent options for a non-destructive identification of the sympatheticallycooled thorium ions in the trap, and describe in detail our chosen experimentalmethod, identifying mass and charge of thorium ions from the positions ofcalcium ions, as their fluorescence is imaged on a CCD camera. These findingsare verified by means of a time-of-flight signal when extracting ions ofdifferent mass-to-charge ratio from the Paul trap and steering them into adetector.

Catching, trapping and in-situ-identification of thorium ions inside Coulomb crystals of $^{40}$Ca$^+$ ions