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TT: Fachverband Tiefe Temperaturen

TT 66: Cryogenic Detectors

TT 66.4: Vortrag

Freitag, 31. März 2023, 10:30–10:45, HSZ 304

Design, fabrication and characterization of magnetic microcalorimeters for radionuclide metrology within the EMPIR project PrimA-LTD — •Michael Müller, Fabienne Bauer, Ria-Helen Zühlke, Trung Duc Tran, Alex Mocanu, and Sebastian Kempf — Institute of Micro- and Nanoelectronic Systems, Karlsruhe Institute of Technology, Karlsruhe.

The EMPIR project “PrimA-LTD” aims to provide ultra-precise measurements of the decay spectra of several radionuclides to enable activity standardization for medicine and industry. As the measurements require an outstanding energy resolution and great linearity over a wide energy range, magnetic microcalorimeters (MMCs) are used as detector technology. The latter are cryogenic particle detectors that make use of a paramagnetic temperature sensor linked to a particle absorber in which the radionuclide is embedded. The sensor is biased by a magnetic field to create a temperature dependent sensor magnetization which is altered by the temperature rise upon a radioactive decay within the absorber and measured using a SQUID. To provide a flexible detector platform, we designed three optimized MMC layouts allowing for different methods of source preparation. For in-house microfabrication of the detectors, we established deposition processes for the various materials needed. This particularly includes an electroplating process for thick, highly conductive absorbers made of gold that are free-standing on stems having a diameter of only 5 µm. We summarize the detector layouts as well as the fabrication status of the detectors and discuss characterization measurements of detector prototypes.