Design and characterization of the SPT-3G receiver (Conference Presentation)
(On behalf of the SPT-3G collaboration)The SPT-3G receiver was commissioned in early 2017 on the 10-meter South Pole Telescope (SPT) to map the Cosmic Microwave Background (CMB) with arcminute resolution. The new instrument significantly improves on previous SPT camera designs, offering unprecedente...
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ftosti:oai:osti.gov:1484266 2023-07-30T04:06:56+02:00 Design and characterization of the SPT-3G receiver (Conference Presentation) Sobrin, J.A. 2022-02-02 application/pdf http://www.osti.gov/servlets/purl/1484266 https://www.osti.gov/biblio/1484266 https://doi.org/10.1117/12.2314366 unknown http://www.osti.gov/servlets/purl/1484266 https://www.osti.gov/biblio/1484266 https://doi.org/10.1117/12.2314366 doi:10.1117/12.2314366 79 ASTRONOMY AND ASTROPHYSICS 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY 2022 ftosti https://doi.org/10.1117/12.2314366 2023-07-11T09:30:19Z (On behalf of the SPT-3G collaboration)The SPT-3G receiver was commissioned in early 2017 on the 10-meter South Pole Telescope (SPT) to map the Cosmic Microwave Background (CMB) with arcminute resolution. The new instrument significantly improves on previous SPT camera designs, offering unprecedented sensitivity to the CMB’s temperature and polarization anisotropies while maintaining a tight control on systematic effects.A restructured optics chain features new secondary and tertiary mirrors to increase the receiver’s field of view by a factor of four in area, coupling light through a set of four cryogenic 720 mm alumina elements, which re-image the Gregorian focus inside the receiver. The broad-band (70-270 GHz) anti-reflective coated lenses are paired with a Lyot stop and cooled to 4 K using a dedicated two-stage pulse-tube cooler (PTC) to minimize in-band attenuation, internal radiative loading, and stray light on the considerably larger focal plane, which is populated with ~2,700 diffraction-limited pixels.Each independent pixel incorporates a lenslet-coupled broadband sinuous antenna, which routes signals through superconducting transmission lines and in-line band-defining filters to six transition-edge sensors, each measuring one of three bands (90, 150, and 220 GHz) and two polarizations, yielding a total of ~16,000 bolometers distributed across ten 150 mm monolithic wafers on a 430 mm image plane. A robust mechanical and thermal architecture supports and cools all detectors across this sizable focal plane to ~250 mK using a closed-cycle Helium adsorption refrigerator backed by a PTC, allowing a duty cycle greater than 90%.This order of magnitude increase in detector count relies on an improved digital frequency-domain SQUID readout system which integrates superconducting inductor-capacitor resonators wired in series with each bolometer to achieve a 68x multiplexing factor while mitigating noise and crosstalk effects.Cumulatively, SPT-3G’s new optics, detector, and readout strategies boast a potential ... Other/Unknown Material South pole SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) South Pole Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy IX 51 |
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SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
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79 ASTRONOMY AND ASTROPHYSICS 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY |
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79 ASTRONOMY AND ASTROPHYSICS 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY Sobrin, J.A. Design and characterization of the SPT-3G receiver (Conference Presentation) |
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79 ASTRONOMY AND ASTROPHYSICS 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY |
description |
(On behalf of the SPT-3G collaboration)The SPT-3G receiver was commissioned in early 2017 on the 10-meter South Pole Telescope (SPT) to map the Cosmic Microwave Background (CMB) with arcminute resolution. The new instrument significantly improves on previous SPT camera designs, offering unprecedented sensitivity to the CMB’s temperature and polarization anisotropies while maintaining a tight control on systematic effects.A restructured optics chain features new secondary and tertiary mirrors to increase the receiver’s field of view by a factor of four in area, coupling light through a set of four cryogenic 720 mm alumina elements, which re-image the Gregorian focus inside the receiver. The broad-band (70-270 GHz) anti-reflective coated lenses are paired with a Lyot stop and cooled to 4 K using a dedicated two-stage pulse-tube cooler (PTC) to minimize in-band attenuation, internal radiative loading, and stray light on the considerably larger focal plane, which is populated with ~2,700 diffraction-limited pixels.Each independent pixel incorporates a lenslet-coupled broadband sinuous antenna, which routes signals through superconducting transmission lines and in-line band-defining filters to six transition-edge sensors, each measuring one of three bands (90, 150, and 220 GHz) and two polarizations, yielding a total of ~16,000 bolometers distributed across ten 150 mm monolithic wafers on a 430 mm image plane. A robust mechanical and thermal architecture supports and cools all detectors across this sizable focal plane to ~250 mK using a closed-cycle Helium adsorption refrigerator backed by a PTC, allowing a duty cycle greater than 90%.This order of magnitude increase in detector count relies on an improved digital frequency-domain SQUID readout system which integrates superconducting inductor-capacitor resonators wired in series with each bolometer to achieve a 68x multiplexing factor while mitigating noise and crosstalk effects.Cumulatively, SPT-3G’s new optics, detector, and readout strategies boast a potential ... |
author |
Sobrin, J.A. |
author_facet |
Sobrin, J.A. |
author_sort |
Sobrin, J.A. |
title |
Design and characterization of the SPT-3G receiver (Conference Presentation) |
title_short |
Design and characterization of the SPT-3G receiver (Conference Presentation) |
title_full |
Design and characterization of the SPT-3G receiver (Conference Presentation) |
title_fullStr |
Design and characterization of the SPT-3G receiver (Conference Presentation) |
title_full_unstemmed |
Design and characterization of the SPT-3G receiver (Conference Presentation) |
title_sort |
design and characterization of the spt-3g receiver (conference presentation) |
publishDate |
2022 |
url |
http://www.osti.gov/servlets/purl/1484266 https://www.osti.gov/biblio/1484266 https://doi.org/10.1117/12.2314366 |
geographic |
South Pole |
geographic_facet |
South Pole |
genre |
South pole |
genre_facet |
South pole |
op_relation |
http://www.osti.gov/servlets/purl/1484266 https://www.osti.gov/biblio/1484266 https://doi.org/10.1117/12.2314366 doi:10.1117/12.2314366 |
op_doi |
https://doi.org/10.1117/12.2314366 |
container_title |
Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy IX |
container_start_page |
51 |
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