Galactic axions search with a superconducting resonant cavity

Abstract

To account for the dark matter content in our Universe, post-inflationary scenarios predict for the QCD axion a mass in the range (10 − 10 3 ) µeV. Searches with haloscope experiments in this mass range require the monitoring of resonant cavity modes with frequency above 5 GHz, where several experimental limitations occur due to linear amplifiers, small volumes, and low quality factors of Cu resonant cavities. In this paper we deal with the last issue, presenting the result of a search for galactic axions using a haloscope based on a 36 cm 3 NbTi superconducting cavity. The cavity worked at T = 4 K in a 2 T magnetic field and exhibited a quality factor Q0 = 4.5 × 10 5 for the TM010 mode at 9 GHz. With such values of Q the axion signal is significantly increased with respect to copper cavity haloscopes. Operating this setup we set the limit gaγγ < 1.03 × 10 −12 GeV −1 on the axion photon coupling for a mass of about 37 µeV. A comprehensive study of the NbTi cavity at different magnetic fields, temperatures, and frequencies is also presented.

Dark matter targets for axionlike particle searches

“…The ALP parameter space is also constrained by a number of resonant cavity experiments. We show the regions excluded by ADMX [16,17] and ADMX Sidecar [98], Phase 1 of HAYSTAC [21], the ORGAN Pathfinder [18], QUAX [19] and the older UF [99] and RBF [100,101] experiments in dark blue in Fig. 3.…”

“…Some future experiments are extensions of resonant microwave cavities technique, as in upgrades to ADMX [102], CAPP [103], KLASH [104,105], and, at higher frequencies, ORGAN [18]. These experiments provide a broader sensitivity in the QCD axion region m a ∼ 10 −6 − 10 −5 eV extending to lower values of g aγγ .…”

“…Recent years have seen a resurgence of interest in searching for axions and ALPs, with a number of active experiments and new proposals under consideration (for reviews see, e.g., [14,15]). These include resonant cavity experiments at various frequencies, such as ADMX [16,17], ORGAN [18], QUAX [19], and HAYSTAC [20,21], and also new ideas including dielectric haloscopes (MADMAX [22,23] and photonic materials [24]), resonant LC-circuits [25,26], detection-induced magnetic flux oscillations (ABRACADABRA [27,28]) and NMR-based techniques (ARIADNE [29,30] and CASPEr [31][32][33]). Collectively these experiments cover many orders of magnitude of possible ALP mass, and are sensitive to ALP couplings to photons or nucleons depending on the experiment.…”

Bandwidth broadening of X-ray free electron laser pulses with the natural gradient of planar undulator

“…The RF deflecting cavities have been widely used in the beam diagnostics of FEL and many other accelerators (Korepanov et al, 2006;Park et al, 2015;Akre et al, 2001;Xiang et al, 2010;Ding et al, 2014;Lee et al, 2014). In the deflecting cavity, the deflecting voltage is zero for the longitudinal centre of the bunch and provides a linear transverse deflection to the rest of the bunch, according to the (Alesini et al, 2006), the transverse displacement of the bunch slice is proportion to the deflecting voltage, thus, the beam transverse tilt can be easily tuned through the deflecting voltage of the TDS structures. For example, a total power of 40 MW will be fed to a pair of X-band deflecting structures (Tan et al, 2014) for SXFEL.…”

Scalable haloscopes for axion dark matter detection in the 30 μeV range with RADES

“…The haloscope technique, so far has proven efficacious in tapping into the benchmark axion dark matter parameter space, see e.g. [14][15][16][17][18][19][20][21][22].…”