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T: Fachverband Teilchenphysik

T 26: Axions/ALPs I

T 26.5: Vortrag

Dienstag, 1. April 2025, 17:15–17:30, VG 0.110

Probing electric fields insida a test setup for the dielectric axion haloscope MADMAX — •Max Zimmermann for the MADMAX collaboration — III. Physikalisches Institut A, RWTH Aachen University

Axions are promising candidates for cold dark matter and the absence of CP violation in strong interaction. The MAgnetized Disc and Mirror Axion eXperiment is a dielectric haloscope experiment targeting axion dark matter in a mass range of 40 to 400 µeV. It consists of multiple, consecutive and movable dielectric discs to amplify the weak microwave signal of axion photon conversion in a strong magnetic field.

Without measuring an axion signal, the problem of calibrating the amplification of the microwave signal occurs. The Bead-pull method and the Gradient method will be presented and their results will be compared. The two methods can both be used to calibrate the setup.

The methods rely on the perturbation of the electric field and the measurement of the reflection. The Bead-pull method uses a bead to perturb the fields in the booster, allowing to probe them in three dimensions from the systems reflectivity. But this will not be possible in the final design of the MADMAX experiment. Instead, with the Gradient method the dielectric disks are moved to perturb the field. This yields less information of the electric field, but may be realized in the final setup.

Keywords: dielectric axion haloscope; axions; dark matter; MADMAX