Dresden 2026 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 22: Superconductivity – Poster I

TT 22.29: Poster

Montag, 9. März 2026, 18:00–20:00, P1

Time response of an MMC-based large-area photon detector operated at mK — •Sebastian Hilscher, Christian Enss, Andreas Fleischmann, Clara Marie Günther, Daniel Hengstler, Ashish Jadhav, Cagla Mahanoglu, Ioana-Alexandra Nitu, Andreas Reifenberger, Christian Ritter, Daniel Unger, and Loredana Gastalo — Kirchhoff Institute for Physics, Heidelberg, Germany

We present a large-area photon detector based on low temperature metallic magnetic calorimeters (MMCs), for which the silicon substrate acts as absorber. The detector is designed for measuring light emission in scintillating crystals, for instance in the AMoRE experiment. The visible photons emitted in the scintillating crystal are absorbed on a central silicon area isolated by through-silicon trenches from the rest of the substrate. Prototype devices have been produced and characterized at mK temperatures with focus on the time profile of temperature pulses. Very important for the optimization of the detector is modeling this time profile. Here, we present simulations of the phonon propagation and scattering inside the silicon absorber, with either specular or diffusive reflections at the surfaces. These simulations provide a time dependence of the fraction of energy reaching the MMC sensor. We compare the results obtained from measurement and simulation and discuss the implications of the photon detector for the AMoRE experiment.

Keywords: Metallic Magnetic Calorimeter; Neutrinos; Low temperature detectors; Microfabrication