Rostock 2019 – scientific programme

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A: Fachverband Atomphysik

A 22: Highly charged ions and their applications

A 22.7: Poster

Wednesday, March 13, 2019, 16:15–18:15, S Fobau Physik

Imaging of Coulomb crystals in a cryogenic Paul trap experiment — •Christian Warnecke, Julian Stark, Sandra Bogen, Lena Haaga, Alexander Ackermann, Steffen Kühn, Janko Nauta, Jan-Hendrik Ölmann, Michael Karl Rosner, Thomas Pfeifer, and José R. Crespo López-Urrutia — Max-Planck-Institut für Kernphysik, Heidelberg, Germany

Cold highly charged ions (HCI) are proposed to be excellent candidates for tests of Standard Model extensions as they feature low susceptibility to external influences and give access to narrow optical transitions, which are not only highly sensitive to possible variations of fundamental constants, but also to non-linearities in isotope shifts. At the Cryogenic Paul Trap Experiment CryPTEx, built at the Max-Planck-Institute for Nuclear Physics, a broad range of HCI can be trapped and sympathetically cooled by laser-cooled Be⁺ Coulomb crystals, which reduces their temperature by eight orders of magnitude down to 10 mK. Its follow-up experiment CryPTEx II includes a novel, superconducting quadrupole resonator that allows for an ion confinement with extremely stable radio-frequency potentials and for higher storage times and decreased heating rates than now. We have designed an objective covering a 500 micron field of view with a solid angle of 0.379 sr at a working distance of 57 mm to image the trapped ions. Our optics is optimized to transmit wavelengths of 235, 313 and 445 nm. We discuss our design and present first commissioning results.