arXiv : Scalable haloscopes for axion dark matter detection in the 30$\mu$eV range with RADES

Álvarez Melcón, A.; Díaz-Morcillo, A.; Millar, A.; Cogollos, C.; Arguedas Cuendis, S.; Irastorza, I.G.; Malbrunot, C.; Gimeno, B.; Navarro, P.; Gallego, J.D.; Döbrich, B.; Peña Garay, C.; Lozano-Guerrero, A.J.; García Barceló, J.M.; Golm, J.; Redondo, J.; Wuensch, W.

doi:10.1007/JHEP07(2020)084

Article
Report number	arXiv:2002.07639 ; NORDITA-2020-010
Title	Scalable haloscopes for axion dark matter detection in the 30$\mu$eV range with RADES
Author(s)	Álvarez Melcón, A. (Cartagena Politecnica U.) ; Arguedas Cuendis, S. (CERN) ; Cogollos, C. (ICC, Barcelona U.) ; Díaz-Morcillo, A. (Cartagena Politecnica U.) ; Döbrich, B. (CERN) ; Gallego, J.D. (Yebes Astron. Ctr.) ; García Barceló, J.M. (Cartagena Politecnica U.) ; Gimeno, B. (Valencia U., IFIC) ; Golm, J. (Jena U.) ; Irastorza, I.G. (Zaragoza U.) ; Lozano-Guerrero, A.J. (Cartagena Politecnica U.) ; Malbrunot, C. (CERN) ; Millar, A. (Munich U.) ; Navarro, P. (Cartagena Politecnica U.) ; Peña Garay, C. (LSC, Canfranc ; Valencia U., IFIC) ; Redondo, J. (Munich, Max Planck Inst. ; Zaragoza U.) ; Wuensch, W. (CERN)
Publication	2020
Imprint	2020-02-25
Number of pages	28
Note	27 pages, 16 figures, v3: expanded sensitivity discussion, version accepted for publication in JHEP
In:	JHEP 2007 (2020) 084
DOI	10.1007/JHEP07(2020)084
Subject category	hep-ph ; Particle Physics - Phenomenology ; hep-ex ; Particle Physics - Experiment
Abstract	RADES (Relic Axion Detector Exploratory Setup) is a project with the goal of directly searching for axion dark matter above the $30 \mu$eV scale employing custom-made microwave filters in magnetic dipole fields. Currently RADES is taking data at the LHC dipole of the CAST experiment. In the long term, the RADES cavities are envisioned to take data in the (baby)-IAXO magnet. In this article we report on the modelling, building and characterisation of an optimised microwave-filter design with alternating irises that exploits maximal coupling to axions while being scalable in length without suffering from mode-mixing. We develop the mathematical formalism and theoretical study which justifies the performance of the chosen design. We also point towards the applicability of this formalism to optimise the MADMAX dielectric haloscopes.
Copyright/License	preprint: (License: arXiv nonexclusive-distrib 1.0)

$Normalised output E-field (gray) and scaled transmissivity (red) for a dielectric haloscope consisting of seven dielectric disks. The refractive index is chosen to be $n = 5$, with each disk placed equidistantly $d$ apart, with $\omega_0=\pi/d$. The top left corresponds to all disks having phase thicknesses $\delta \sim \pi/2$. The top right has all $\delta \sim 3\pi/2$. The bottom left has alternating disks starting with $\delta \sim \pi/2$ and the bottom right has alternating disks starting $\delta \sim 3\pi/2$. The transmissivity of each setup is scaled up to match the E-field (by a factor 40 in the top panels, 20 in the bottom).$ $Normalised output E-field (gray) and scaled transmissivity (red) for a dielectric haloscope consisting of seven dielectric disks. The refractive index is chosen to be $n = 5$, with each disk placed equidistantly $d$ apart, with $\omega_0=\pi/d$. The top left corresponds to all disks having phase thicknesses $\delta \sim \pi/2$. The top right has all $\delta \sim 3\pi/2$. The bottom left has alternating disks starting with $\delta \sim \pi/2$ and the bottom right has alternating disks starting $\delta \sim 3\pi/2$. The transmissivity of each setup is scaled up to match the E-field (by a factor 40 in the top panels, 20 in the bottom).$ $Normalised output E-field (gray) and scaled transmissivity (red) for a dielectric haloscope consisting of seven dielectric disks. The refractive index is chosen to be $n = 5$, with each disk placed equidistantly $d$ apart, with $\omega_0=\pi/d$. The top left corresponds to all disks having phase thicknesses $\delta \sim \pi/2$. The top right has all $\delta \sim 3\pi/2$. The bottom left has alternating disks starting with $\delta \sim \pi/2$ and the bottom right has alternating disks starting $\delta \sim 3\pi/2$. The transmissivity of each setup is scaled up to match the E-field (by a factor 40 in the top panels, 20 in the bottom).$ Show more plots

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