Dresden 2017 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 71: Superconductivity: Cryodetectors and Cryotechnique

TT 71.7: Vortrag

Donnerstag, 23. März 2017, 16:45–17:00, HSZ 201

Development of a 64 pixel metallic magnetic calorimeter based detector array with integrated microwave SQUID multiplexer — •Mathias Wegner, Loredana Gastaldo, Andreas Fleischmann, Michael Keller, Daniel Richter, Sebastian Kempf, and Christian Enss — Kirchhoff-Institute for Physics, Heidelberg University, Im Neuenheimer Feld 227, D-69120 Heidelberg

Microwave SQUID multiplexing (µMUXing) appears to be the most promising readout technique for arrays of low-temperature microcalorimeters requiring a large bandwidth per pixel. It is therefore highly suited for reading out metallic magnetic calorimeters (MMCs) that uniquely combine an intrinsically fast signal rise time, an excellent energy resolution and a highly linear detector response.

In this contribution we present the first demonstration of µMUXing of MMCs using a 64 pixel detector array that is read out by an integrated, on-chip multiplexer. Each detector features two 5 µm thick X-ray absorbers and is optimized for soft X-ray spectroscopy. The estimated energy resolution for all pixels within the array is below 10 eV. We will present our design and discuss a detailed characterization of the device. In particular, we will show that its performance is as expected when considering the geometry and the thermodynamical properties of the detectors as well as the multiplexer parameters. In addition, we will summarize the status of the development of a software defined radio based readout electronics as well as our advances concerning flux ramp modulation which we will use for linearizing the multiplexer output signal.