Design of New Resonant Haloscopes in the Search for the Dark Matter Axion: A Review of the First Steps in the RADES Collaboration

Abstract

With the increasing interest in dark matter axion detection through haloscopes, in which different international groups are currently involved, the RADES group was established in 2016 with the goal of developing very sensitive detection systems to be operated in dipole magnets. This review deals with the work developed by this collaboration during its first five years: from the first designs—based on the multi-cavity concept, aiming to increase the haloscope volume, and thereby improve sensitivity—to their evolution, data acquisition design, and finally, the first experimental run. Moreover, the envisaged work within RADES for both dipole and solenoid magnets in the short and medium term is also presented.

New Horizons: Scalar and Vector Ultralight Dark Matter

“…Earth ) ∼ 10 3 λ c , where λ c = 2π/(m φ c) is the Compton wavelength. The issue of coherence in UDM searches has received attention recently in the context of searches in the lower mass range when the coherence timescale exceeds the duration of experiments [78], as well as searches in the higher mass range when the detector size exceeds the coherence length scale [79,80]. The amplitude of an oscillating UDM field varies stochastically on time and length scales which exceed the coherence time and coherence length, respectively [81,82].…”

The Canfranc Axion Detection Experiment (CADEx): Search for axions at 90 GHz with Kinetic Inductance Detectors

“…Therefore, the operational goals in the design of the haloscope, in order to maximize the detected power and maximizing the sensitivity to g aγ , is to optimize the coupling β while maximizing V , C and Q 0 . Following the experience in RADES for 8.4 GHz haloscopes [78], we adopt rectangular geometries for the cavities and calculate the above parameters for this type of microwave resonators.…”

“…Therefore, in order to maximize C, an electromagnetic mode with the electric field parallel to this magnetic field must be chosen. In a rectangular cavity, assuming the z-axis as the magnet axis, this is the TM 110 , with C = 64/π 4 ≈ 0.66 [78].…”

Digging into Axion Physics with (Baby)IAXO

“…The RADES initiative is put forward by groups from the Universidad Politécnica de Cartagena, the Universidad de Valencia (and the Instituto de Física Corpuscular (IFIC)), the Centro Astronómico de Yebes, the LSC and CAPA, in addition to groups from CERN. More details are given in [119].…”

“…Looking for relic axions is one of them: installing a high-Q microwave cavity inside its magnet would turn IAXO into a haloscope. Some ideas towards such an implementation are being pursued [119].…”