Simultaneous MMC readout using a tailored {\mu}MUX based readout system

TL;DR

This paper demonstrates the first successful implementation of a frequency-division multiplexed readout system for large-scale magnetic microcalorimeter arrays using a custom microwave SQUID multiplexer, enabling scalable cryogenic detection.

Contribution

It introduces a novel, tailored microwave SQUID multiplexer for MMC readout, facilitating large-scale detector array applications.

Findings

First truly multiplexed MMC readout achieved

Demonstrates scalability for large detector arrays

High energy resolution maintained in multiplexed system

Abstract

Magnetic microcalorimeters (MMCs) are cryogenic, energy-dispersive single-particle detectors providing excellent energy resolution, intrinsically fast signal rise time, quantum efficiency close to 100\%, large dynamic range as well as almost ideal linear response. One of the remaining challenges to be overcome to ultimately allow for the utilization of large-scale MMC based detector arrays with thousands to millions of individual pixels is the realization of a SQUID based multiplexing technique particularly tailored for MMC readout. Within this context, we report on the first truly multiplexed readout of an MMC based detector array using a frequency-division multiplexing approach realized by a custom microwave SQUID multiplexer based readout system.