SMuK 2023 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 117: Dark Matter I

T 117.3: Vortrag

Donnerstag, 23. März 2023, 16:20–16:35, HSZ/0003

Measurements of dielectric properties of single crystal sapphire (Al2O3) for the axion dark matter search experiment, MADMAX — •Haotian Wang, Alexander Schmidt, and Erdem Oez for the MADMAX collaboration — III. Physikalisches Institut A ,RWTH, Aachen, Germany

Axions are one of the candidates for cold dark matter and will be searched in the range of microwave frequencies from 10 to 100 GHz in the magnetized disk and mirror axion (MADMAX) experiment. Multiple dielectric disks will be used to amplify the axion signal. The dielectric properties, dielectric constant and loss tangent, of the disk materials affect the boost factor, so precise knowledge of them is crucial for the detection of axion. Here we present measurement results of dielectric properties of sapphire (Al2O3), a candidate material for the dielectric disks, at room temperature (295-297 K) and at 18 K. The measurements are done in the 10 to 40 GHz range using a microwave resonator.