# Aachen 2019 – wissenschaftliches Programm

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# T: Fachverband Teilchenphysik

## T 57: Axionen II

### T 57.4: Vortrag

### Mittwoch, 27. März 2019, 16:50–17:05, S09

**MADMAX - Towards a Dielectric Axion Haloscope** — •Christoph Krieger for the MADMAX collaboration — Universität Hamburg, Institut für Experimentalphysik, Luruper Chaussee 149, 22761 Hamburg

The axion, a low-mass particle arising from an elegant solution to the strong CP problem, is a viable and natural candidate for (cold) dark matter. Its major coupling to ordinary matter is realized as a coupling to two photons allowing for axion photon conversion inside strong electromagnetic fields. Due to a linear relation between the axion mass and its coupling, for low axion masses, detection becomes non-trivial.

Especially, the range of 40 to 400 µeV, favored in one of the well motivated scenarios, cannot be accessed with the standard haloscope approach. Therefore, for the **MA**gentized **D**isc and **M**irror **A**xion e**X**periment the dielectric haloscope approach will be used, utilizing the axion photon conversion at dielectric surfaces in a strong magnetic field. By combining many surfaces, the conversion can be boosted significantly using constructive interference and resonances.

For MADMAX a booster consisting of 80 dielectric discs with 1 m^{2} size inside a magnetic field in the order of 10 T are envisioned. The relative positions of these discs has to be adjustable in the range of a few to tens of millimeter with micrometer precision.

In this presentation, developments and first results towards a (technical) prototype, including production of tiled large area discs and characterization measurements, will be shown along prospects for the final experiment to be build at DESY in Hamburg.