Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 63: Poster Session: Cryogenic Particle Detectors and Cryotechnique

TT 63.3: Poster

Donnerstag, 4. April 2019, 15:00–18:30, Poster D

Development of MMC based combined photon and phonon detector for rare event searches — •Freerik Forndran¹, Felix Ahrens¹, Christian Enss¹, Andreas Fleischmann¹, Loredana Gastaldo¹, Sebastian Kempf¹, Yong-Hamb Kim², Daniel Unger¹, and Clemens Velte¹ — ¹Kirchhoff Institute for Physics, Heidelberg University, Germany — ²IBS Center for Underground Physics, Daejeon, Rep. of Korea.

In the search for rare events, a simultaneous measurement of photons and phonons produced after an event in a scintillating crystal operated at mK temperatures enables an efficient background rejection. This is due to the fact that the light yield depends on the mass, allowing for particle discrimination. This approach can be used for an investigation of the neutrinoless double beta decay as well as for a direct detection of dark matter. We present the design of a combined photon and phonon detector based on metallic magnetic calorimeters (MMCs). Simulations predict an energy resolution of Δ E_FWHM<10 eV, a signal rise time of τ₀<50 µ s and a signal decay time of τ₁<10 ms for the photon detector and Δ E_FWHM<100 eV, τ₀<200 µ s and τ₁<10 ms for the phonon detectors. The combined photon and phonon detector design will be described with emphasis on the tower design of the detector setup able to host several crystals. The challenges of the fabrication steps will be discussed. In conclusion we will present the characterization of first prototypes of photon and phonon detectors.