SKM 2023 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 66: Cryogenic Detectors

TT 66.3: Vortrag

Freitag, 31. März 2023, 10:15–10:30, HSZ 304

Advances in microwave SQUID multiplexing of magnetic microcalorimeters — •Martin Neidig, Alexander Maatz, Felix Schuderer, Marvin Völlinger, Mathias Wegner, Stefan Wünsch, and Sebastian Kempf — Institute of Micro- and Nanoelectronic Systems, Karlsruhe Institute of Technology, Karlsruhe, Germany.

The excellent energy resolution, very fast signal rise time and almost ideal linear detector response over a wide energy range makes magnetic microcalorimeters (MMCs) an exceedingly attractive detector technology for applications in various fields of science. The increasing necessity to operate large-scale detector arrays consisting of thousands to millions of individual detectors inherently poses the challenge of developing a suitable multiplexing technique. The presently most promising one is microwave SQUID multiplexing. Here, each individual detector is inductively coupled to a non-hysteretic, unshunted rf-SQUID that, in turn, is inductively coupled to a superconducting microwave resonator having a unique resonance frequency. In this configuration, an actual detector event results in a change of the effective SQUID inductance and hence in the resonance frequency of the related resonator. Moreover, capacitively coupling many of such readout channels to a single transmission line ultimately allows to read out hundreds to thousands of detectors simultaneously. In this contribution, we summarize our latest developments regarding the implementation of a microwave SQUID multiplexer for MMC readout. This includes aspects regarding to microfabrication as well as device characterization using software defined radio based readout electronics.