Freiburg 2024 – scientific programme

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A: Fachverband Atomphysik

A 15: Poster I

A 15.16: Poster

Tuesday, March 12, 2024, 17:00–19:00, Tent A

Towards Ground State Cooling of a Highly Charged Ion - Beryllium Crystal at low Secular Frequency — •Stepan Kokh, Vera M. Schäfer, Elwin A. Dijck, Christian Warnecke, Lukas F. Storz, José R. Crespo López-Urrutia, and Thomas Pfeifer — Max-Planck-Institut für Kernphysik, Heidelberg

Spectroscopy of ions and atoms for generalized King Plot analysis is a rapidly developing field with the potential to identify new physics, such as unknown particles or forces [1]. Using highly charged ions (HCI) for it gives access to previously unavailable transitions. For such an analysis, high precision is required, and suppression of external perturbations is essential. Our superconducting Paul trap shields external fields by 57 dB, a level comparable to dedicated magnetically shielded rooms [2]. However, the current setup limits our secular frequency due to the loss of superconductivity at high RF power. Therefore, we operate only in an intermediate Lamb-Dicke regime. We report on the progress towards ground-state cooling of sympathetically cooled HCI in the given experimental setup.

[1] Nils-Holger Rehbehn, et al., Phys. Rev. Lett. 131, 161803 (2023) [2] Elwin A. Dijck, et al., Rev. Sci. Instrum. 94, 083203 (2023)

Keywords: Ground State Cooling; Highly Charged Ions; Paul Trap