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Title: Integrated Performance of a Frequency Domain Multiplexing Readout in the SPT-3G Receiver

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC); Gordon and Betty Moore Foundation; National Science Foundation (NSF)
OSTI Identifier:
1295615
DOE Contract Number:
AC02-06CH11357
Resource Type:
Conference
Resource Relation:
Conference: 2016 SPIE Astronomical Telescopes and Instrumentation, 06/26/16 - 07/01/16, Edinburgh, Scotland, GB
Country of Publication:
United States
Language:
English

Citation Formats

Bender, A. N., Ade, P. A. R., Anderson, A. J., Avva, J., Ahmed, Z., Arnold, K., Austermann, J. E., Basu Thakur, R., Benson, B. A., Bleem, L. E., Byrum, K., Carlstrom, J. E., Carter, F. W., Chang, C. L., Wang, G., and Yefremenko, V. Integrated Performance of a Frequency Domain Multiplexing Readout in the SPT-3G Receiver. United States: N. p., 2016. Web. doi:10.1117/12.2232146.
Bender, A. N., Ade, P. A. R., Anderson, A. J., Avva, J., Ahmed, Z., Arnold, K., Austermann, J. E., Basu Thakur, R., Benson, B. A., Bleem, L. E., Byrum, K., Carlstrom, J. E., Carter, F. W., Chang, C. L., Wang, G., & Yefremenko, V. Integrated Performance of a Frequency Domain Multiplexing Readout in the SPT-3G Receiver. United States. doi:10.1117/12.2232146.
Bender, A. N., Ade, P. A. R., Anderson, A. J., Avva, J., Ahmed, Z., Arnold, K., Austermann, J. E., Basu Thakur, R., Benson, B. A., Bleem, L. E., Byrum, K., Carlstrom, J. E., Carter, F. W., Chang, C. L., Wang, G., and Yefremenko, V. Wed . "Integrated Performance of a Frequency Domain Multiplexing Readout in the SPT-3G Receiver". United States. doi:10.1117/12.2232146.
@article{osti_1295615,
title = {Integrated Performance of a Frequency Domain Multiplexing Readout in the SPT-3G Receiver},
author = {Bender, A. N. and Ade, P. A. R. and Anderson, A. J. and Avva, J. and Ahmed, Z. and Arnold, K. and Austermann, J. E. and Basu Thakur, R. and Benson, B. A. and Bleem, L. E. and Byrum, K. and Carlstrom, J. E. and Carter, F. W. and Chang, C. L. and Wang, G. and Yefremenko, V.},
abstractNote = {},
doi = {10.1117/12.2232146},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Jul 20 00:00:00 EDT 2016},
month = {Wed Jul 20 00:00:00 EDT 2016}
}

Conference:
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  • Now, detectors for cosmic microwave background (CMB) experiments are background limited, so a straightforward alternative to improve sensitivity is to increase the number of detectors. Large arrays of multichroic pixels constitute an economical approach to increasing the number of detectors within a given focal plane area. We present the fabrication of large arrays of dual-polarized multichroic transition-edge-sensor (TES) bolometers for the South Pole Telescope third-generation CMB receiver (SPT-3G). The complete SPT-3G receiver will have 2690 pixels, each with six detectors, allowing for individual measurement of three spectral bands (centered at 95 GHz, 150 GHz and 220 GHz) in two orthogonalmore » polarizations. In total, the SPT-3G focal plane will have 16140 detectors. Each pixel is comprised of a broad-band sinuous antenna coupled to a niobium microstrip transmission line. In-line filters are used to define the different band-passes before the millimeter-wavelength signal is fed to the respective Ti/Au TES sensors. Detectors are read out using a 64x frequency domain multiplexing (fMux) scheme. The microfabrication of the SPT-3G detector arrays involves a total of 18 processes, including 13 lithography steps. Together with the fabrication process, the effect of processing on the Ti/Au TES's T-c is discussed. In addition, detectors fabricated with Ti/Au TES films with Tc between 400 mK 560 mK are presented and their thermal characteristics are evaluated. Optical characterization of the arrays is presented as well, indicating that the response of the detectors is in good agreement with the design values for all three spectral bands (95 GHz, 150 GHz, and 220 GHz). The measured optical efficiency of the detectors is between 0.3 and 0.8. Our results discussed here are extracted from a batch of research of development wafers used to develop the baseline process for the fabrication of the arrays of detectors to be deployed with the SPT-3G receiver. Results from these research and development wafers have been incorporated into the fabrication process to get the baseline fabrication process presented here. SPT-3G is scheduled to deploy to the South Pole Telescope in late 2016.« less
  • The third-generation South Pole Telescope camera is designed to measure the cosmic microwave background across three frequency bands (95, 150 and 220 GHz) with ~16,000 transition-edge sensor (TES) bolometers. Each multichroic pixel 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 polarization directions, via lumped element filters. Ten detector wafers populate the focal plane, 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, andmore » optical and polarization efficiencies of the focal plane. 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 ms and 5 ms. The beam is round with the correct size, and the polarization efficiency is more than 90% for most of the bolometers« less
  • The development of planar fabrication techniques for superconducting transition-edge sensors has brought large-scale arrays of 1000 pixels or more to the realm of practicality. This raises the problem of reading out a large number of sensors with a tractable number of connections. A possible solution is frequency-domain multiplexing. I summarize basic principles, present various circuit topologies, and discuss design trade-offs, noise performance, cross-talk and dynamic range. The design of a practical device and its readout system is described with a discussion of fabrication issues, practical limits and future prospects.
  • The development of planar fabrication techniques for superconducting transition-edge sensors has brought large-scale arrays of 1000 pixels or more to the realm of practicality. This raises the problem of reading out a large number of sensors with a tractable number of connections. A possible solution is frequency-domain multiplexing. I summarize basic principles, present various circuit topologies, and discuss design trade-offs, noise performance, cross-talk and dynamic range. The design of a practical device and its readout system is described with a discussion of fabrication issues, practical limits and future prospects.