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Title: Optical Characterization of the SPT-3G Camera

Journal Article · · Journal of Low Temperature Physics

The third-generation South Pole Telescope camera is designed to measure the cosmic microwave background across three frequency bands (centered at 95, 150 and 220 GHz) with ~ 16,000 transition-edge sensor (TES) bolometers. Each multichroic array element on a detector wafer has a broadband sinuous antenna that couples power to six TESs, one for each of the three observing bands and both polarizations, via lumped element filters. Ten detector wafers populate the detector array, which is coupled to the sky via a large-aperture optical system. Here we present the frequency band characterization with Fourier transform spectroscopy, measurements of optical time constants, beam properties, and optical and polarization efficiencies of the detector array. The detectors have frequency bands consistent with our simulations and have high average optical efficiency which is 86, 77 and 66% for the 95, 150 and 220 GHz detectors. The time constants of the detectors are mostly between 0.5 and 5 ms. The beam is round with the correct size, and the polarization efficiency is more than 90% for most of the bolometers.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC); National Science Foundation (NSF); Gordon and Betty Moore Foundation Grant (GBMF); Natural Sciences and Engineering Research Council of Canada (NSERC)
Contributing Organization:
SPT Team
Grant/Contract Number:
AC02-76SF00515; PLR-1248097; PHY-1125897; AC02-06CH11357; AC02-07CH11359
OSTI ID:
1490484
Journal Information:
Journal of Low Temperature Physics, Vol. 193, Issue 3-4; ISSN 0022-2291
Publisher:
Plenum PressCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 16 works
Citation information provided by
Web of Science

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Integrated performance of a frequency domain multiplexing readout in the SPT-3G receiver conference July 2016
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Cited By (10)

Thermal Links and Microstrip Transmission Lines in SPT-3G Bolometers journal June 2018
Fabrication of Detector Arrays for the SPT-3G Receiver journal May 2018
SPT-3G: A Multichroic Receiver for the South Pole Telescope journal July 2018
Low-Temperature Detectors for CMB Imaging Arrays journal August 2018
Design and Bolometer Characterization of the SPT-3G First-Year Focal Plane journal September 2018
The POLARBEAR Fourier transform spectrometer calibrator and spectroscopic characterization of the POLARBEAR instrument journal November 2019
Year two instrument status of the SPT-3G cosmic microwave background receiver
  • Carter, Faustin W.; Cecil, Thomas W.; Chang, Clarence L.
  • Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy IX https://doi.org/10.1117/12.2312426
conference August 2018
Characterization and performance of the second-year SPT-3G focal plane
  • Ahmed, Zeeshan; Thakur, Ritoban B.; Bender, Amy N.
  • Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy IX https://doi.org/10.1117/12.2312451
conference July 2018
The POLARBEAR Fourier Transform Spectrometer Calibrator and Spectroscopic Characterization of the POLARBEAR Instrument text January 2019
A Compact Millimeter-Wavelength Fourier-Transform Spectrometer text January 2019

Figures / Tables (3)


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