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A: Fachverband Atomphysik

A 13: Highly Charged Ions and their Applications II

A 13.6: Vortrag

Dienstag, 3. März 2026, 12:30–12:45, N 25

The Microwave Cavity Penning Trap for the Lsym Experiment — •Paul Holzenkamp, Maria Pasinetti, Fabian Raab, Leonie Marzel, Sarah Placek, Andreas Thoma, Sangeetha Sasidharan, and Sven Sturm — MPIK, Heidelberg, Germany

Lsym is a cryogenic Penning trap experiment, aiming to significantly improve the precision of CPT tests for the electron and positron. Specifically, we will look for an asymmetry in their charge-to-mass ratio as well as their g-factors or determine stringent limits. The trap will be cooled to about 300 mK to minimize transition rates out of the ground states of the cyclotron and axial motion, respectively. While the cyclotron motion cools via synchrotron radiation, for the axial motion, cavity assisted side-band cooling will be employed. To this end, the main Penning trap ("CavityTrap") not only should provide a highly harmonic trapping potential but also needs to support efficient millimeter wave spin control drives at the Larmor frequency and axial sideband, while efficiently rejecting photons at the cyclotron frequency. To achieve this, both the mode structure and the in-coupling of the microwaves into the cavity have to be designed appropriately. Additionally, the CavityTrap should allow for the separation of the singly charged helium ion and the positron that are trapped together. Numerical simulations are used to design the CavityTrap geometry in order to simultaneously fulfill the requirements for the microwave cavity structure and also optimize the electrostatic potential of the Penning trap. I will show the current status of the Lsym CavityTrap design.

Keywords: Penning trap; Groundstate Cooling; CPT; Microwave Cavity; Positron