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TT: Fachverband Tiefe Temperaturen
TT 18: Superconductivity: Poster
TT 18.50: Poster
Monday, March 18, 2024, 15:00–18:00, Poster C
A dc-SQUID flux ramp modulation multiplexer in 4x32 configuration — •D. Mazibrada1, A. Abeln1, A. Ferring- Siebert1, N. Kahne1, D. Hengstler1, L. Hoibl1, L. Münch1, D. Richter1, A. Stoll1, T. Wolber3, T. Muscheid3, N. Karcher3, M. Weber3, O. Sander3, A. Fleischmann1, L. Gastaldo1, S. Kempf2,3,1, and C. Enss1 — 1KIP, Heidelberg University, Germany. — 2IMS, Karlsruhe Institute of Technology, Germany. — 3IPE, Karlsruhe Institute of Technology, Germany.
Superconducting quantum interference devices (SQUIDs) are flux-to-voltage converters with high sensitivity which offer a large bandwidth. With the flux ramp modulation (FRM) multiplexing technique it is possible to read out several dc-SQUIDs through a single line.
In this contribution we discuss our first FRM dc-SQUID multiplexer to read out a 16x16 metallic magnetic calorimeter array. It relaxes the hardware requirements of a SQUID system and allows a linearized readout while achieving a large dynamic range. We installed 16 individual SQUID chips containing 2 arrays, each combining 4 dc-SQUIDs connected in series. The SQUIDs operate in open-loop mode, where each SQUID in an array is provided with a different flux ramp signal while we measure the voltage across an entire array. The flux ramp modulation signals are shared by all 32 arrays, so the entire setup acts as a 4x32 configuration. This reduces the number of wires by almost a factor of 8 compared to a brute force parallel SQUID readout of the detector. This approach allows a cost-effective, simultaneous readout with adequate energy resolution.
Keywords: Multiplexing; Flux Ramp Modulation; Detector Readout; DC-SQUID