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T: Fachverband Teilchenphysik

T 102: Axions/ALPs III

T 102.6: Vortrag

Freitag, 20. März 2026, 10:15–10:30, KH 02.019

Development of a radiopure GridPix detector for BabyIAXO — •Johanna von Oy, Klaus Desch, Jochen Kaminski, and Tobias Schiffer — Physikalisches Institut der Universität Bonn

BabyIAXO is the intermediate stage experiment of the International AXion Observatory (IAXO), a next generation helioscope for the search for axions. BabyIAXO is planned to be built at DESY in Hamburg, and its components are currently under construction. Helioscopes consist of a magnet, where solar axions can convert into X-ray photons, optics to focus the X-rays and detectors to detect them.

Due to the existing stringent limits on the axion-photon coupling, the probability of an axion-induced X-ray reaching the detector is low. Therefore, all detectors built for IAXO and BabyIAXO have to have a low intrinsic background and be combined with active and passive shielding.

A detector technology that is suitable to detect X-rays in the energy range of different solar axion models is a GridPix detector. It is a gas-filled detector with an aluminium grid on top of a pixelated readout chip, which can detect individual electrons produced by particles in the gas. This detector can be constructed in a relatively radiopure form as most of its components can be made out of very pure copper, Teflon and Kapton.

The detector is currently in the assembly and commissioning phase, with the radiopure components having been produced last year. This talk will focus on the developments and steps necessary to reach the background levels required for BabyIAXO.

Keywords: IAXO; Axion; GridPix