Regensburg 2022 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 31: Superconducting Electronics and Cryogenics: Poster Session

TT 31.8: Poster

Thursday, September 8, 2022, 15:00–18:00, P1

Towards large-area 256-pixel MMC arrays with multiplexed read-out based on flux-ramp modulated dc-SQUIDs — •A. Abeln, S. Allgeier, L. Eisenmann, D. Hengstler, N. Kahne, F. Krämer, D. Mazibrada, L. Münch, A. Stoll, A. Fleischmann, and C. Enss — Kirchhoff-institute for Physics, Heidelberg University

Metallic Magnetic Calorimeters (MMCs) are energy-dispersive cryogenic particle detectors. Operated at about 20 mK, they provide very good energy resolution of down to 1.6 eV at 6 keV, high quantum efficiency as well as linearity over a large energy range. In many precision based experiments on high resolution X-ray spectroscopy the photon flux is small, thus a large active detection area is desirable. Therefore, arrays with a large number of MMC pixels are beneficial. For a cost-effective read-out of a growing number of detector channels we develop different multiplexing techniques.

In this contribution we present the design of a novel 16×16 pixel MMC array. Each pixel provides an active detection area of 250 µm×250 µm yielding a total active detection area of about 4 mm×4 mm. With a thickness of 5 µm the absorbers made of gold ensure a quantum efficiency of at least 50 % for energies up to 20 keV. The designed energy resolution according to numerical simulations is ΔE_FWHM=1.4 eV at an operation temperature of 20 mK. We also present the current status of flux-ramp multiplexing that allows to reduce the number of read-out channels by at least a factor of four compared to a conventional read-out.