Göttingen 2025 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 89: Axions/ALPs III

T 89.5: Vortrag

Freitag, 4. April 2025, 10:00–10:15, VG 0.110

First search for axion dark matter using a MADMAX prototype — •David Leppla-Weber for the MADMAX collaboration — Deutsches Elektronen-Synchrotron DESY, Germany

The nature of dark matter is one of the biggest open questions in physics today. One possible answer is the axion, which was originally predicted as a solution to the strong CP problem but also makes for an excellent cold dark matter candidate. The MAgnetized Disk and Mirror Axion eXperiment (MADMAX) aims at detecting axions from the galactic dark matter halo in the theoretically well motivated mass range around 100 µ eV using a dielectric haloscope. It utilizes a booster system consisting of a stack of dielectric disks and a mirror to resonantly enhance the axion-photon conversion in a magnetic field. Results of the first axion dark matter search using a MADMAX prototype are shown and the calibration procedure is explained. A system with three ø 200 mm sapphire disks in a < 1.6 T magnetic field was used. No dark matter signal was observed. The results demonstrate the feasibility of such systems and their capability to reach unexplored parameter space.

Keywords: MADMAX; dark matter; axion; dielectric haloscope