Heidelberg 2022 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 105: Search for Dark Matter 6

T 105.2: Vortrag

Donnerstag, 24. März 2022, 16:30–16:45, T-H37

Measurements of dielectric properties of single crystals of Lanthanum Aluminate (LaAlO3) and Sapphire (Al2O3) for the axion dark matter search experiment, MADMAX — •Erdem Oez for the MADMAX collaboration — RWTH, Aachen

The magnetized disk and mirror axion (MADMAX) experiment will search for axions as cold dark matter candidate in the range of microwave frequencies from 10 to 100 GHz. Multiple parallel dielectric discs are planned to be used to boost the axion generated RF signal by 3 orders of magnitude compared to a single metal surface of the same area. Precise knowledge of the dielectric loss and the dielectric constant of the disc materials is crucial for understanding the predicted axion signal. At these RF frequencies the measurement of low loss materials are especially challenging. Here we present cryostatic measurements of LaAlO3 and Al2O3 which are the best candidate materials for MADMAX. The measurements were done in the 10 to 40 GHz range using a microwave resonator.