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A: Fachverband Atomphysik

A 39: Highly Charged Ions and their Applications

A 39.3: Vortrag

Freitag, 14. März 2025, 11:30–11:45, KlHS Mathe

Towards trapping positrons in the Lsym experiment — •Fabian Raab, Maria Pasinetti, Paul Holzenkamp, Andreas Thoma, Luca Falzoni, Björn-Benny Bauer, Sangeetha Sasidharan, and Sven Sturm — Max-Planck Institute for Nuclear Physics, 69117 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 the trapped positron has to be cooled to its ground state of motion. Therefore, 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 trapping positrons as well as an update on the microwave filter, that will be used to counteract heating above the groundstate, will be illustrated.

Keywords: CPT; Penning trap; Positrons; Groundstate cooling; Microwave filter