Bonn 2025 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 39: Highly Charged Ions and their Applications

A 39.4: Vortrag

Freitag, 14. März 2025, 11:45–12:00, KlHS Mathe

The microwave cavity Penning trap for the LSym projet — •Paul Holzenkamp, Björn-Benny Bauer, Luca Falzoni, Maria Pasinetti, Fabian Raab, Andreas Thoma, Sangeetha Sasidharan, and Sven Sturm — 69117 Heidelberg, Saupfercheckweg 1

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 300mK 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. Furthermore, 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. 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: microwave cavity; Penning trap; efficient spin-flips; ground-state cooling; positron