Characterization of $$\mathrm{MKIDs}$$ for $$\mathrm{CMB}$$ Observation at 220 GHz With the South Pole Telescope
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- University of Chicago, IL (United States); University of Chicago, IL (United States). Kavli Institute for Cosmological Physics (KICP)
- Cardiff University, Wales (United Kingdom); Argonne National Laboratory (ANL), Argonne, IL (United States)
- University of Chicago, IL (United States); University of Chicago, IL (United States). Kavli Institute for Cosmological Physics (KICP); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- University of Chicago, IL (United States); University of Chicago, IL (United States). Kavli Institute for Cosmological Physics (KICP); Argonne National Laboratory (ANL), Argonne, IL (United States)
- McGill University, Montreal, QC (Canada)
- University of Chicago, IL (United States). Kavli Institute for Cosmological Physics (KICP); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
Here we present an updated design of the 220 GHz microwave kinetic inductance detector (MKID) pixel for SPT-3G+, the next-generation camera for the South Pole Telescope. We show results of the dark testing of a 63-pixel array with mean inductor quality factor Qi = 4.8 x 105, aluminum inductor transition temperature Tc = 1.19 K, and kinetic inductance fraction αk = 0.32. We optically characterize both the microstrip-coupled and CPW-coupled resonators, and find both have a spectral response close to prediction with an optical efficiency of η ~ 70%. However, we find slightly lower optical response on the lower edge of the band than predicted, with neighboring dark detectors showing more response in this region, though at level consistent with less than 5% frequency shift relative to the optical detectors. The detectors show polarized response consistent with expectations, with a cross-polar response of ~ 10% for both detector orientations.
- Research Organization:
- Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP); Natural Sciences and Engineering Research Council of Canada (NSERC); Canadian Institute for Advanced Research
- Contributing Organization:
- South Pole Telescope 3G+ Collaboration
- Grant/Contract Number:
- AC02-07CH11359
- OSTI ID:
- 1973427
- Report Number(s):
- FERMILAB-CONF-23-214-PPD; arXiv:2304.01158; oai:inspirehep.net:2648445
- Journal Information:
- IEEE Transactions on Applied Superconductivity, Vol. 33, Issue 5; ISSN 1051-8223
- Publisher:
- IEEECopyright Statement
- Country of Publication:
- United States
- Language:
- English
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