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Microwave SQUID Multiplexing of Metallic Magnetic Calorimeters: Status of Multiplexer Performance and Room-Temperature Readout Electronics Development

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Abstract

To our present best knowledge, microwave SQUID multiplexing (\(\mu \)MUXing) is the most suitable technique for reading out large-scale low-temperature microcalorimeter arrays that consist of hundreds or thousands of individual pixels which require a large readout bandwidth per pixel. For this reason, the present readout strategy for metallic magnetic calorimeter (MMC) arrays combining an intrinsic fast signal rise time, an excellent energy resolution, a large energy dynamic range, a quantum efficiency close to \(100\%\) as well as a highly linear detector response is based on \(\mu \)MUXing. Within this paper, we summarize the state of the art in MMC \(\mu \)MUXing and discuss the most recent results. This particularly includes the discussion of the performance of a 64-pixel detector array with integrated, on-chip microwave SQUID multiplexer, the progress in flux ramp modulation of MMCs as well as the status of the development of a software-defined radio-based room-temperature electronics which is specifically optimized for MMC readout.

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Acknowledgements

We would like to thank T. Wolf as well as the KIP cleanroom team for technical support during device fabrication. The work was performed in the framework of the DFG research unit FOR2202 (funding under En299/7-1), the European Microkelvin Platform EMP, the Karlsruhe School of Elementary Particle and Astroparticle Physics: Science and Technology (KSETA) as well as Heidelberg Karlsruhe Research Partnership HEiKA.

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Authors and Affiliations

  1. Kirchhoff-Institute for Physics, Heidelberg University, Heidelberg, Germany

    M. Wegner, D. Richter, F. Ahrens, S. Kempf & C. Enss

  2. Institute for Data Processing and Electronics, Karlsruhe Institute of Technology, Karlsruhe, Germany

    N. Karcher, O. Krömer, O. Sander & M. Weber

  3. HEiKA - Heidelberg Karlsruhe Research Partnership, Heidelberg University, Karlsruhe Institute of Technology (KIT), Heidelberg, Karlsruhe, Germany

    O. Sander, S. Kempf, M. Weber & C. Enss

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  1. M. Wegner
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  2. N. Karcher
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  3. O. Krömer
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  4. D. Richter
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  5. F. Ahrens
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  6. O. Sander
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  7. S. Kempf
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  8. M. Weber
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  9. C. Enss
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Correspondence to S. Kempf.

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Wegner, M., Karcher, N., Krömer, O. et al. Microwave SQUID Multiplexing of Metallic Magnetic Calorimeters: Status of Multiplexer Performance and Room-Temperature Readout Electronics Development. J Low Temp Phys 193, 462–475 (2018). https://doi.org/10.1007/s10909-018-1878-3

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  • DOI: https://doi.org/10.1007/s10909-018-1878-3

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