Freiburg 2024 – scientific programme
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A: Fachverband Atomphysik
A 25: Poster IV
A 25.11: Poster
Wednesday, March 13, 2024, 17:00–19:00, Tent A
Characterisation of Drifts and Non-Linearity of Data Acquisition Electronics for Metallic Magnetic Calorimeter Detectors — •Daniel A. Müller1,3, Philip Pfäfflein1,2,3, Marc O. Herdrich1,3, Christoph Hahn1,2, Felix M. Kröger1,2,3, Bastian Löher2, Günter Weber1,2, and Thomas Stöhlker1,2,3 — 1HI-Jena, Jena, Germany — 2GSI, Darmstad, Germany — 3Friedrich-Schiller-Universität Jena, Jena, Germany
Recent experiments employing novel metallic magnetic calorimeter detectors have shown the excellent spectral resolution (better than 100 eV FWHM at 100 keV) and timing capability of those detectors. The measurement principle of this detector is based on a temperature rise of an absorber by stopping an incident x-ray photon resulting in a change of the magnetisation of a paramagnetic sensor. With a superconducting quantum interference device those changes can be measured with high sensitivity. While providing a wide energy acceptance (0.1 - 100 keV), the entire spectral range can only be fully utilised, if drifts and non-linear effects of the data acquisition electronics are under control. Otherwise precision spectroscopy is only possible if a well-known x-ray or gamma line is close to the line of interest for establishing an absolute energy scale. In the present work, we report on the characterisation of STRUCK SIS3316 digitizer modules in terms of integral non-linearity and temperature-dependent drifts. It has been shown that these effects have a sizeable impact on the spectral performance of the detectors. Furthermore, a calibration and correction method to mitigate these effects on the recorded spectrum was developed.