Sidelobe modeling and mitigation for a three mirror anastigmat cosmic microwave background telescope
Telescopes measuring cosmic microwave background (CMB) polarization on large angular scales require exquisite control of systematic errors to ensure the fidelity of the cosmological results. In particular, far-sidelobe contamination from wide angle scattering is a potentially prominent source of sys...
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ftosti:oai:osti.gov:1959818 2023-07-30T04:06:53+02:00 Sidelobe modeling and mitigation for a three mirror anastigmat cosmic microwave background telescope Gullett, Ian Benson, Bradford Besuner, Robert Bihary, Richard Carlstrom, John Emerson, Nick Gallardo, Patricio A. Gomez, Jillian King, Cesiley L. McMahon, Jeff May, Jared L. Nagy, Johanna M. Natoli, Tyler Niemack, Michael D. Okun, Kate Padin, Stephen Ruhl, John E. Wollack, Edward J. Zivick, Jeff 2023-06-19 application/pdf http://www.osti.gov/servlets/purl/1959818 https://www.osti.gov/biblio/1959818 https://doi.org/10.1364/ao.488454 unknown http://www.osti.gov/servlets/purl/1959818 https://www.osti.gov/biblio/1959818 https://doi.org/10.1364/ao.488454 doi:10.1364/ao.488454 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY 2023 ftosti https://doi.org/10.1364/ao.488454 2023-07-11T10:25:07Z Telescopes measuring cosmic microwave background (CMB) polarization on large angular scales require exquisite control of systematic errors to ensure the fidelity of the cosmological results. In particular, far-sidelobe contamination from wide angle scattering is a potentially prominent source of systematic error for large aperture microwave telescopes. Here we describe and demonstrate a ray-tracing-based modeling technique to predict far sidelobes for a three mirror anastigmat telescope designed to observe the CMB from the South Pole. Those sidelobes are produced by light scattered in the receiver optics subsequently interacting with the walls of the surrounding telescope enclosure. After comparing simulated sidelobe maps and angular power spectra for different enclosure wall treatments, we propose a highly scattering surface that would provide more than an order of magnitude reduction in the degree-scale far-sidelobe contrast compared to a typical reflective surface. Finally, we conclude by discussing the fabrication of a prototype scattering wall panel and presenting measurements of its angular scattering profile. Other/Unknown Material South pole SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) South Pole Applied Optics 62 16 4334 |
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SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
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ftosti |
language |
unknown |
topic |
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY |
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46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY Gullett, Ian Benson, Bradford Besuner, Robert Bihary, Richard Carlstrom, John Emerson, Nick Gallardo, Patricio A. Gomez, Jillian King, Cesiley L. McMahon, Jeff May, Jared L. Nagy, Johanna M. Natoli, Tyler Niemack, Michael D. Okun, Kate Padin, Stephen Ruhl, John E. Wollack, Edward J. Zivick, Jeff Sidelobe modeling and mitigation for a three mirror anastigmat cosmic microwave background telescope |
topic_facet |
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY |
description |
Telescopes measuring cosmic microwave background (CMB) polarization on large angular scales require exquisite control of systematic errors to ensure the fidelity of the cosmological results. In particular, far-sidelobe contamination from wide angle scattering is a potentially prominent source of systematic error for large aperture microwave telescopes. Here we describe and demonstrate a ray-tracing-based modeling technique to predict far sidelobes for a three mirror anastigmat telescope designed to observe the CMB from the South Pole. Those sidelobes are produced by light scattered in the receiver optics subsequently interacting with the walls of the surrounding telescope enclosure. After comparing simulated sidelobe maps and angular power spectra for different enclosure wall treatments, we propose a highly scattering surface that would provide more than an order of magnitude reduction in the degree-scale far-sidelobe contrast compared to a typical reflective surface. Finally, we conclude by discussing the fabrication of a prototype scattering wall panel and presenting measurements of its angular scattering profile. |
author |
Gullett, Ian Benson, Bradford Besuner, Robert Bihary, Richard Carlstrom, John Emerson, Nick Gallardo, Patricio A. Gomez, Jillian King, Cesiley L. McMahon, Jeff May, Jared L. Nagy, Johanna M. Natoli, Tyler Niemack, Michael D. Okun, Kate Padin, Stephen Ruhl, John E. Wollack, Edward J. Zivick, Jeff |
author_facet |
Gullett, Ian Benson, Bradford Besuner, Robert Bihary, Richard Carlstrom, John Emerson, Nick Gallardo, Patricio A. Gomez, Jillian King, Cesiley L. McMahon, Jeff May, Jared L. Nagy, Johanna M. Natoli, Tyler Niemack, Michael D. Okun, Kate Padin, Stephen Ruhl, John E. Wollack, Edward J. Zivick, Jeff |
author_sort |
Gullett, Ian |
title |
Sidelobe modeling and mitigation for a three mirror anastigmat cosmic microwave background telescope |
title_short |
Sidelobe modeling and mitigation for a three mirror anastigmat cosmic microwave background telescope |
title_full |
Sidelobe modeling and mitigation for a three mirror anastigmat cosmic microwave background telescope |
title_fullStr |
Sidelobe modeling and mitigation for a three mirror anastigmat cosmic microwave background telescope |
title_full_unstemmed |
Sidelobe modeling and mitigation for a three mirror anastigmat cosmic microwave background telescope |
title_sort |
sidelobe modeling and mitigation for a three mirror anastigmat cosmic microwave background telescope |
publishDate |
2023 |
url |
http://www.osti.gov/servlets/purl/1959818 https://www.osti.gov/biblio/1959818 https://doi.org/10.1364/ao.488454 |
geographic |
South Pole |
geographic_facet |
South Pole |
genre |
South pole |
genre_facet |
South pole |
op_relation |
http://www.osti.gov/servlets/purl/1959818 https://www.osti.gov/biblio/1959818 https://doi.org/10.1364/ao.488454 doi:10.1364/ao.488454 |
op_doi |
https://doi.org/10.1364/ao.488454 |
container_title |
Applied Optics |
container_volume |
62 |
container_issue |
16 |
container_start_page |
4334 |
_version_ |
1772819832477057024 |