Freiburg 2024 – scientific programme

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A: Fachverband Atomphysik

A 16: Poster II

A 16.3: Poster

Tuesday, March 12, 2024, 17:00–19:00, Tent B

Towards large-area 256-pixel MMC arrays for high resolution X-ray spectroscopy — •A. Abeln, S. Allgeier, D. Hengstler, D. Kreuzberger, D. Mazibrada, L. Münch, A. Orlow, A. Reifenberger, A. Stoll, A. Fleischmann, L. Gastaldo, and C. Enss — Kirchhoff-Institute for Physics, Im Neuenheimer Feld 227, 69120 Heidelberg, Germany

Metallic Magnetic Calorimeters (MMCs) are energy-dispersive cryogenic particle detectors. Operated at temperatures below 50 mK, they provide very good energy resolution, high quantum efficiency as well as high linearity over a large energy range. In many precision experiments in X-ray spectroscopy the photon flux is small, thus a large active detection area is desirable. Therefore, we develop arrays with increasing number of pixels. For a cost-effective read-out of a growing number of detector channels we investigate different multiplexing techniques.

In this contribution we present a detector setup comprising a novel dense-packed 16×16 pixel MMC array. The pixels provide a total active area of 4 mm×4 mm and are equipped with 5 µm thick absorbers made of gold. This ensures a stopping power of at least 50 % for photon energies up to 20 keV. The expected energy resolution is ΔE=1.4 eV (FWHM) at an operating temperature of 20 mK. Furthermore the detector setup features 16 in-house made SQUID chips each with 2×4 flux-ramp modulated dc-SQUIDs which enables us to read out 128 detector channels with 32 read-out channels. We present design considerations and discuss the detector performance.

Keywords: Metallic Magnetic Calorimeter; X-ray spectroscopy; SQUID multiplexing; Microfabrication