Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 98: Search for Dark Matter 4

T 98.2: Talk

Thursday, March 7, 2024, 16:15–16:30, Geb. 30.35: HSI

A new test stand for detector tests at Bonn University — •Gerrit Schmieden, Johanna von Oy, Tobias Schiffer, Klaus Desch, and Jochen Kaminski — Universität Bonn, Bonn

The search for the axion particle using helioscopes, like IAXO, requires detectors sensitive to low-energy X-rays (∼1 keV). Due to the low probability of axion-to-X-ray conversion via the inverse Primakoff effect only very few events are expected. This results in the need for ultra-low background detectors. A GridPix detector, constructed from radio-pure materials, is a suitable candidate.

In order to estimate the background behaviour of the detector a dedicated test stand, is essential. This setup consists of two subsystems: a passive lead shielding to block external radiation and an active muon veto based on scintillators. The muon veto is consisting of 14 scintillators and will cover a 4π solid angle. In order to loose as few events as possible fast timing information, synchronised with the detector, is needed. Therefore a new readout system is developed using a Teensy 4.1 microcontroller.

The talk will offer insights into the construction of the test stand, with a special focus on the scintillator readout.

Keywords: Axion; IAXO; Low background