Dortmund 2021 – scientific programme

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T: Fachverband Teilchenphysik

T 10: Gaseous detectors

T 10.4: Talk

Monday, March 15, 2021, 16:45–17:00, Tj

X ray reconstruction for IAXO using a Timepix 3 based InGrid — Ivor Fleck, •Jan Hahn, and Ulrich Werthenbach — Center for Particle Physics Siegen, Experimentelle Teilchenphysik, Universität Siegen

We present a reconstruction algorithm for X ray photons in a gaseous volume instrumented with a Gridpix. The algorithm is based on the Cambridge Aachen algorithm for jet reconstruction. By recursive recombination, active pixels on the readout chip are combined to clusters based on their distance to each other, combining the closest pair until the minimal distance exceeds a threshold. Each pixel corresponds to one electron from the primary ionisation.These clusters are subjected to cuts to to reject background and noise. Several X ray energies are investigated using iron-55 and X ray fluorescence of aluminum, copper and rubidium to obtain an energy calibration for energies in the region of interest for solar axion searches between 1 and 14 keV. In addition, different cuts are investigated to separate signal and background. Unknown energies can be reconstructed by the number of hits assigned to the cluster and the calibration. The experimental setup operates in an 80:20 mixture of argon and carbon dioxide at room temperature and ambient pressure.