Heidelberg 2022 – scientific programme
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T: Fachverband Teilchenphysik
T 105: Search for Dark Matter 6
T 105.2: Talk
Thursday, March 24, 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.