Göttingen 2025 – scientific programme

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T: Fachverband Teilchenphysik

T 26: Axions/ALPs I

T 26.2: Talk

Tuesday, April 1, 2025, 16:30–16:45, VG 0.110

X-ray focus on axions: optics for the International AXion Observatory (IAXO) — •Julia K. Vogel for the IAXO collaboration — Fakultät für Physik, TU Dortmund, Otto-Hahn-Str. 4, Dortmund D-44221, Germany

Axions are one of the leading candidates for the hypothetical, non-baryonic dark matter expected to account for about 27% of the energy density of the Universe. Axion helioscopes are experiments searching for axions and axion-like particles (ALPs) produced in the core of the Sun via the Primakoff effect by utilizing strong magnetic fields, x-ray optics and ultralow-background detectors. The International Axion Observatory (IAXO) is a next generation axion helioscope aiming at a sensitivity to the axion-photon coupling of 1−1.5 orders of magnitude beyond the current most sensitive axion helioscope, the CERN Axion Solar Telescope (CAST). BabyIAXO (BIAXO) is an intermediate scale helioscope with sensitivities to axion-photon couplings down to a few 10⁻¹¹ GeV⁻¹ reducing risks for IAXO while delivering first significant physics results. The optics for (B)IAXO are a key part of the experiment and consist of multilayer-coated Wolter-I approximations. Two pathfinder optics have been successfully tested at CAST and at the Panter x-ray test facility of MPE. Here we briefly introduce (B)IAXO and detail the optics and coating design along with the pathfinder performances.

Keywords: Axions; ALPs; IAXO; X-ray telescopes; NuSTAR