Heidelberg 2022 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 105: Search for Dark Matter 6

T 105.4: Vortrag

Donnerstag, 24. März 2022, 17:00–17:15, T-H37

Calibrating a Dielectric Haloscope — •Jacob Egge for the MADMAX collaboration — Institut für Experimentalphysik, Universität Hamburg, Luruper Chaussee149, 22761 Hamburg

Dielectric haloscopes like the MAgnetized Disk and Mirror Axion eXperiment aim to detect axions, a dark matter candidate, from the galactic halo by resonant conversion to photons in a strong magnetic field. A movable stack of parallel dielectric disks can amplify the axion-photon conversion probability by several orders of magnitude. This amplification depends on the spatial variation of the axion, photon, and magnetic field. While the axion and magnetic fields are largely static and homogeneous, the frequency-dependent photon field inside the dielectric stack and thus the overall amplification is difficult to characterize.

In this talk, a new calibration method based on non-resonant perturbation theory is presented. It provides a promising way to experimentally constrain the photon field inside the dielectric stack. By perturbing the position of each dielectric disk and measuring the resulting change in reflectivity, one can infer the photon field configuration at each dielectric interface. This then allows computing the amplified axion-photon conversion probability independent of many parameters like dielectric loss and disk geometry. The validity and feasibility of this method are demonstrated with FEM simulations and first measurements on a 5 disks setup.