Mainz 2026 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 14: Precision Spectroscopy of Atoms and Ions I (joint session A/Q)

Q 14.3: Vortrag

Montag, 2. März 2026, 17:45–18:00, N 3

Hyper-EBIT: The development of a source for very highly charged ions — •Luca Yannik Geißler, Matthew Bohman, Fabian Heiße, Philipp Justus, Anton Gramberg, Jonathan Morgner, Charlotte Maria König, Jialin Liu, José Ramon Crespo López-Urrutia, Sven Sturm, and Klaus Blaum — Max-Planck-Institut für Kernphysik, 69117 Heidelberg

Quantum electrodynamics (QED) is considered to be the most successful quantum field theory in the Standard Model. Its most precise test follows from the comparison of the measured g-factor of the free electron and its prediction by QED. While this comparison tests QED at small electromagnetic field strengths, highly charged ions (HCI) allow performing a similar test at much stronger fields. In HCI, only the innermost electron(s) remain, which experience strong electric fields of up to 10¹⁶ V/cm due to the vicinity of the electrons and the nucleus. An experiment that enables such precision studies is ALPHATRAP[Sturm et al., EPJST 227, 1425 (2019)], a cryogenic Penning-trap setup dedicated to measuring the bound-electron magnetic moments of HCIs with high precision. The most stringent test of the bound-electron g-factor performed by ALPHATRAP to date was conducted with hydrogen-like tin[Morgner et al., Nature 622, 53 (2023)]. To extend these high-field tests to heavier HCIs, such as g_j(²⁰⁸Pb⁸¹⁺), an electron-beam ion trap (EBIT), the Hyper-EBIT, was built at MPIK to produce such ions. It is designed to provide electron-beam energies of up to 300 keV and beam currents of up to 500 mA. This contribution presents the latest developments and current status of the Hyper-EBIT.

Keywords: Highly charged ions; Electron beam ion trap; Quantum electrodynamics; Precision measurments