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A microwave SQUID multiplexer optimized for bolometric applications

Journal Article · · Applied Physics Letters
DOI:https://doi.org/10.1063/5.0033416· OSTI ID:1777457
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  1. Univ. of Colorado, Boulder, CO (United States). Dept. of Physics; National Inst. of Standards and Technology (NIST), Boulder, CO (United States)
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States). Kavli Institute for Particle Astrophysics and Cosmology
  3. Univ. of California, San Diego, CA (United States). Dept. of Physics
  4. National Inst. of Standards and Technology (NIST), Boulder, CO (United States)
  5. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  6. Univ. of Colorado, Boulder, CO (United States). Dept. of Physics
  7. Princeton Univ., NJ (United States). Dept. of Physics
  8. Stanford Univ., CA (United States). Dept. of Physics

A microwave SQUID (superconducting quantum interference device) has been optimized for reading out large arrays of superconducting transition-edge sensor (TES) bolometers. We present the scalable cryogenic multiplexer chip design that may be used to construct an 1820-channel multiplexer for the 4-8 GHz rf band. The key metrics of yield, sensitivity, and crosstalk are determined through measurements of 455 readout channels, which span 4-5 GHz. The median white-noise level is 45 pA/ $$\sqrt{Hz}$$, evaluated at 2 Hz, with a 1/f knee ≤ 20 mHz after common-mode subtraction. The white-noise level decreases the sensitivity of a TES bolometer optimized for detection of the cosmic microwave background at 150 GHz by only 3%. The measured crosstalk between any channel pair is ≤ 0.3%.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1777457
Alternate ID(s):
OSTI ID: 1970629
Journal Information:
Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 6 Vol. 118; ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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