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MADMAX: A new Dark Matter Axion Search using a Dielectric Haloscope

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arxiv 1611.04549 v1 pith:QPCT5UEU submitted 2016-11-14 astro-ph.IM astro-ph.COhep-ex

Béla Majorovits , Javier Redondo (for the MADMAX Working Group: A. Caldwell , G. Dvali , C. Gooch , A. Hambarzumjan , B. Majorovits , A. Millar , G. Raffelt
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J. Redondo O. Reimann F. Simon F. Steffen)
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keywords axiondarkmatterdielectricmasspeccei-quinnpresentedamplifiers
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abstract

The axion is an intriguing dark matter candidate emerging from the Peccei-Quinn solution to the strong CP problem. Current experimental searches for axion dark matter focus on the axion mass range below 40 $\mu$eV. However, if the Peccei-Quinn symmetry is restored after inflation the observed dark matter density points to an axion mass around 100 $\mu$eV. A new project based on axion-photon conversion at the transition between different dielectric media is presented. By using $\sim 80$ dielectric discs, the emitted power could be enhanced by a factor of $\sim 10^5$ over that from a single mirror (flat dish antenna). Within a 10 T magnetic field, this could be enough to detect $\sim 100 \mu$eV axions with HEMT linear amplifiers. The design for an experiment is proposed. Results from noise, transmissivity and reflectivity measurements obtained in a prototype setup are presented. The expected sensitivity is shown.

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