20th Patras Workshop on Axions, WIMPs and WISPs

Session

Morning - 3

23 Sept 2025, 09:00

71. The ORGAN Experiment: Progress and Future Directions in High-Mass Axion Searches

Michael Tobar

23/09/2025, 09:00

The Oscillating Resonant Group Axion (ORGAN) experiment is a microwave cavity haloscope searching for axion dark matter in the high-mass region of 15–50 GHz. The recently completed Phase 1b successfully scanned the 107.42–111.93 μeV (26–27 GHz) mass range using a novel rectangular copper cavity, achieving leading sensitivity and excluding axionlike particle (ALP) cogenesis models over this...

10. Axion Polarimeteric Experiment (APE)

Qazal Rokn (Maxplanck institute for gravitational physics)

23/09/2025, 10:00

Axion and axion-like particles are hypothesized to interact with photons, inducing a time-varying
rotation in the polarization of linearly polarized laser light. This work presents a highly sensitive
apparatus designed to detect this rotation. The setup employs a polarimetry configuration featuring
two quarter-wave plates inside a Fabry-P´erot cavity, allowing us to investigate unexplored...

20. Exploring Dark Matter Features with SNIPE Hunt and DALI Experiments

Abaz Kryemadhi (Messiah University)

23/09/2025, 10:06

Dark matter candidates such as axions and dark photons can generate coherent, oscillating magnetic fields at the Earth’s surface, arising from boundary conditions between the conductive Earth and the ionosphere. The Search for Non-Interacting Particles Experiment (SNIPE) collaboration employs a global network of magnetometers in radio-quiet locations to search for these signals. An update on...

33. Thermal design and modeling of the Tenerife Microwave Spectrometer: towards high precision spectral measurements of the microwave sky at 10-20GHz

Angela Maria Arriero Lopez (instituto de astrofisica de canarias)

23/09/2025, 10:26

According to the ΛCDM model, spectral distortions of the CMB from a perfect blackbody shape are expected. The COBE experiment was the first to measure the absolute spectrum of the CMB in the 1 to 95 cm⁻¹ frequency range, but it did not detect any deviations from a pure blackbody. Absolute measurements of the CMB at longer wavelengths than those covered by COBE have been performed by a few...

35. FAxE: A Gigahertz Fabry-Perot Resonator for Axion Dark Matter Detection

Jacob Egge (University of Hamburg)

23/09/2025, 10:32

Conventional closed resonator haloscopes become increasingly ineffective at probing axion masses above $\sim 40 \mathrm{\mu eV} $, as their effective volume scales as $V_\mathrm{eff} \propto 1/m_a^{3}$, leading to a steep decline in signal power with increasing mass. Open resonators, in contrast, relax the transverse boundary conditions, resulting in a more favorable scaling of $V_\mathrm{eff}...