Dresden 2026 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 22: Superconductivity – Poster I
TT 22.32: Poster
Monday, March 9, 2026, 18:00–20:00, P1
Towards reproducible Transition Edge Sensors for rare event searches — •Kilian Heim1, Godehard Angloher1, Laci Andricek2, Mukund Bharadwaj1, Dieter Hauff3, Bernd Liebig2, Gerhard Liemann2, Jelena Ninkovic2, Karoline Schäffner1,3, Kumrie Shera1, Raimund Strauss3, Philipp Wasser3, and Lutz Ziegele1 — 1Max-Planck-Institut für Physik — 2Max-Planck Halbleiterlabor — 3Technische Universität München
One approach to the search for dark matter is the use of scintillating crystals, such as sodium iodide (NaI), operated at cryogenic temperatures, as implemented by the COSINUS experiment. The readout of the signal, generated upon a nuclear recoil in a NaI crystal, relies on tungsten based transition edge sensors (TESs). These sensors consist of thin (~200 nm) tungsten films that are operated in the transition between the normal and superconducting state.
The transition temperature of such thin tungsten films depends on a multitude of factors, including grain size, stress level, and film impurities. However, for COSINUS, and next-generation rare event searches, the ability to mass-produce sensors with a consistent transition temperature of ~15 mK is crucial. Achieving this necessitates a solid understanding of the factors influencing the transition temperature as well as a precise control of these parameters during the fabrication process.
This contribution presents the first steps taken towards the establishment of a reproducible TES fabrication process as well as future measures to achieve consistent transition temperatures.
Keywords: Cryogenic Detectors; Quantum Sensors; Transition Edge Sensors; Dark Matter; Fabrication