Mainz 2026 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 4: Highly Charged Ions and their Applications I

A 4.3: Vortrag

Montag, 2. März 2026, 12:15–12:30, N 25

Update on the Lsym experimental setup — •Fabian Raab, Maria Pasinetti, Paul Holzenkamp, Sarah Placek, Leonie Marzel, Andreas Thoma, Sangeetha Sasidharan, and Sven Sturm — MPIK, Heidelberg, Germany

Lsym is a new cryogenic Penning trap experiment that intends to test the symmetry of matter and antimatter in the lepton sector. In particular, the experiment will test for differences in mass, charge and g-factor of the positron and electron to achieve the most precise test for a hypothetical CPT violation for leptons so far. In the experiment we detect the particles motional frequencies via image current detectors. To further cool the trapped positron to its ground state of motion, the trap assembly is cooled to about 300 mK, where the trap cavity is largely depleted from black-body photons around the cyclotron frequency of 140 GHz. In this presentation our recent steps towards setting up our detection system as well as an update on the microwave setup, that will be used to counteract heating above the groundstate, will be illustrated.

Keywords: CPT; Groundstate cooling; Penning trap; Microwave filtering; Resonant detectors