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Abstract

High precision spectroscopy of highly charged ions demands ultra cold and stable environments, a prerequisite uncommon for their location of production. To evade this
difficulty, the CryPTEx-II experiment spatially separates the ion production from storage
by trapping these inside a cryogenic superconducting Paul trap. During this thesis, argon
ions were produced inside an electron beam ion trap and guided through a beamline
towards the Paul trap. The different charge states that made up the ion beam were
identified by their time of flight and a single charge state, Ar¹⁴⁺, was selected. These
selected ions were decelerated and bunched inside a pulsed drift tube and injected into
a Paul trap biased to an elevated potential. Electrodes acting as mirrors for charged
particles reected the ion bunch multiple times inside the trap. Meanwhile, a Coulomb
crystal of Be⁺ ions cooled the reected ions sympathetically. Finally, Ar¹⁴⁺ ions were stopped inside the crystal, demonstrating the successful transfer of a highly charged ion
into an ultra cold environment suitable for precision spectroscopy.