Heidelberg 2022 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 105: Search for Dark Matter 6

T 105.3: Vortrag

Donnerstag, 24. März 2022, 16:45–17:00, T-H37

Dielectric Disk Production for the MADMAX — •Dominik Breitmoser — Institut für Experimentalphysik, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg

The MAgentized Disk and Mirror Axion eXperiment (MADMAX) is an upcoming experiment to search for dark matter axions in the unexplored mass range of 40-400 µeV. The QCD axion is a solution to the strong CP problem and simultaneously an excellent cold dark matter candidate. In a strong magnetic field, axion-induced photons would be emitted at dielectric interfaces. MADMAX uses the dielectric haloscope approach to boost such a signal by combining up to 80 dielectric disks with 1.25 m diameter and precisely adjustment of the disk distances. The axion to photon conversion is enhanced through interference and resonance effects.

To reach the required sensitivity the disks need a large dielectric constant whilst having low dielectric losses. Experimental constraints demand a planarity below 10  µm, surface roughness below 10 µm and a thickness of 1 mm. A favorable material could be lanthanum aluminate. However the material is only available in the size of 3No-dq wafers. Thus, the disks need to be produced from small tiles which are glued together. This talk presents the method of manufacturing a prototype disk ( 300 mm), the studies for optimizing production parameters, and explains the measurement system used for quality control.