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T: Fachverband Teilchenphysik

T 26: Axions/ALPs I

T 26.3: Vortrag

Dienstag, 1. April 2025, 16:45–17:00, VG 0.110

Development of a GridPix Detector for the International AXion Observatory — •Johanna von Oy, Klaus Desch, Jochen Kaminski, Tobias Schiffer, Sebastian Schmidt, and Markus Gruber for the IAXO collaboration — Physikalisches Institut der Universität Bonn

Axion searches with helioscope experiments like the International AXion Observatory (IAXO) focus mainly on the solar axion production. With its dense and high temperature environment, the sun’s core can produce a high flux of axions through the Primakoff effect and ABC processes. To detect these solar axions, IAXO and also its intermediate stage BabyIAXO, will consist of a magnet that follows the sun for twelve hours a day. In the magnetic field the axions couple to X-rays which can then be focused onto dedicated detectors.

One of these detectors will be built in Bonn. Thanks to the solar axions’ small coupling strengths and energies of about ∼1 keV the two main requirements for a detector are an ultra low background and the ability to detect low energy X-rays.

A GridPix based gas-filled detector made out of very radiopure materials is therefore a good fit for a helioscope experiment. The ultra-thin vacuum-tight window will allow for low energy X-rays to enter the gas volume and produce electrons. The aluminium grid on top of a pixelated readout chip, the Timepix3, makes the detection of single electrons and therefore low energy X-rays possible.

This talk will focus on the development and challenges of a GridPix based detector for axion searches with IAXO and BabyIAXO.

Keywords: IAXO; Axion; Detector