A first proof of principle booster setup for the MADMAX dielectric haloscope

Abstract

Axions and axion-like particles are excellent low-mass dark matter candidates. The MADMAX experiment aims to directly detect galactic axions with masses between $40\mu \mathrm{eV}$ and $400\mu \mathrm{eV}$ by using the axion-induced emission of electromagnetic waves from boundaries between materials of different dielectric constants under a strong magnetic field. Combining many such surfaces, this emission can be significantly enhanced (boosted) using constructive interference and resonances. We present a first proof of principle realization of such a booster system consisting of a copper mirror and up to five sapphire disks. The electromagnetic response of the system is investigated by reflectivity measurements. The mechanical accuracy, calibration process of unwanted reflections and the repeatability of a basic tuning algorithm to place the disks are investigated. We find that for the presented cases the electromagnetic response in terms of the group delay predicted by one-dimensional calculations is sufficiently realized in our setup. The repeatability of the tuning is at the percent level, and would have small impact on the sensitivity of such a booster.

arXiv comment10 pages, 12 figures; minor changes, introduction and references expanded, matches published version

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• Direct Detection of Dark Matter -- APPEC Committee Report
• A dark matter telescope probing the 6 to 60 GHz band
• First search for axion dark matter with a Madmax prototype
• First search for dark photon dark matter with a MADMAX prototype
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• Impedance Matching to Axion Dark Matter: Considerations of the Photon-Electron Interaction
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