Modelling ground pickup for microwave telescopes

Alexandre E. Adler; Adriaan J. Duivenvoorden; Jon E. Gudmundsson

doi:10.1117/12.2629042

Modelling ground pickup for microwave telescopes

Alexandre E. Adler^*, Adriaan J. Duivenvoorden, Jon E. Gudmundsson

^*Corresponding author for this work

Faculty of Physical Sciences

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

Microwave telescopes require an ever-increasing control of experimental systematics in their quest to measure the Cosmic Microwave Background (CMB) to exquisite levels of precision. One important systematic for ground and balloon-borne experiments is ground pickup, where beam sidelobes detect the thermal emission of the much warmer ground while the main beam is scanning the sky. This generates scan-synchronous noise in experiment timestreams, which is difficult to filter out without also deleting some of the signal from the sky. Therefore, efficient modelling of pickup can help guide the design of experiments and of analysis pipelines. In this work, we present an extension to the BEAMCONV algorithm that enables us to generate time-ordered data (TOD) from beam-convolved sky and ground maps simultaneously. We simulate ground pickup for both a ground-based experiment and a telescope attached to a stratospheric balloon. Ground templates for the balloon experiment are obtained by re-projecting satellite maps of the Earth's microwave emission.

Original language	English
Title of host publication	Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XI
Editors	Jonas Zmuidzinas, Jian-Rong Gao
Publisher	SPIE
ISBN (Electronic)	9781510653610
DOIs	https://doi.org/10.1117/12.2629042
Publication status	Published - 2022
Event	Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XI 2022 - Montreal, Canada Duration: 17 Jul 2022 → 22 Jul 2022

Publication series

Name	Proceedings of SPIE - The International Society for Optical Engineering
Volume	12190
ISSN (Print)	0277-786X
ISSN (Electronic)	1996-756X

Conference

Conference	Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XI 2022
Country/Territory	Canada
City	Montreal
Period	17/07/22 → 22/07/22

Bibliographical note

Funding Information:
The authors would like to thank Steven Benton, Kevin Crowley, Nadia Dachlythra and Reijo Keskitalo for productive discussions. Alexandre Adler’s participation to this SPIE conference is funded by the Birger and Gurli Grundströms research grant fund.

Publisher Copyright:
© 2022 SPIE.

Other keywords

Beam convolution
CMB Telescopes
Cosmic Microwave Background
Ground Pickup
Scan-synchronous noise

Access to Document

10.1117/12.2629042

Cite this

Adler, A. E., Duivenvoorden, A. J., & Gudmundsson, J. E. (2022). Modelling ground pickup for microwave telescopes. In J. Zmuidzinas, & J-R. Gao (Eds.), Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XI Article 121902M (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 12190). SPIE. https://doi.org/10.1117/12.2629042

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title = "Modelling ground pickup for microwave telescopes",

abstract = "Microwave telescopes require an ever-increasing control of experimental systematics in their quest to measure the Cosmic Microwave Background (CMB) to exquisite levels of precision. One important systematic for ground and balloon-borne experiments is ground pickup, where beam sidelobes detect the thermal emission of the much warmer ground while the main beam is scanning the sky. This generates scan-synchronous noise in experiment timestreams, which is difficult to filter out without also deleting some of the signal from the sky. Therefore, efficient modelling of pickup can help guide the design of experiments and of analysis pipelines. In this work, we present an extension to the BEAMCONV algorithm that enables us to generate time-ordered data (TOD) from beam-convolved sky and ground maps simultaneously. We simulate ground pickup for both a ground-based experiment and a telescope attached to a stratospheric balloon. Ground templates for the balloon experiment are obtained by re-projecting satellite maps of the Earth's microwave emission.",

keywords = "Beam convolution, CMB Telescopes, Cosmic Microwave Background, Ground Pickup, Scan-synchronous noise",

author = "Adler, {Alexandre E.} and Duivenvoorden, {Adriaan J.} and Gudmundsson, {Jon E.}",

note = "Funding Information: The authors would like to thank Steven Benton, Kevin Crowley, Nadia Dachlythra and Reijo Keskitalo for productive discussions. Alexandre Adler{\textquoteright}s participation to this SPIE conference is funded by the Birger and Gurli Grundstr{\"o}ms research grant fund. Publisher Copyright: {\textcopyright} 2022 SPIE.; Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XI 2022 ; Conference date: 17-07-2022 Through 22-07-2022",

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doi = "10.1117/12.2629042",

language = "English",

series = "Proceedings of SPIE - The International Society for Optical Engineering",

publisher = "SPIE",

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Adler, AE, Duivenvoorden, AJ & Gudmundsson, JE 2022, Modelling ground pickup for microwave telescopes. in J Zmuidzinas & J-R Gao (eds), Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XI., 121902M, Proceedings of SPIE - The International Society for Optical Engineering, vol. 12190, SPIE, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XI 2022, Montreal, Canada, 17/07/22. https://doi.org/10.1117/12.2629042

Modelling ground pickup for microwave telescopes. / Adler, Alexandre E.; Duivenvoorden, Adriaan J.; Gudmundsson, Jon E.
Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XI. ed. / Jonas Zmuidzinas; Jian-Rong Gao. SPIE, 2022. 121902M (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 12190).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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N1 - Funding Information: The authors would like to thank Steven Benton, Kevin Crowley, Nadia Dachlythra and Reijo Keskitalo for productive discussions. Alexandre Adler’s participation to this SPIE conference is funded by the Birger and Gurli Grundströms research grant fund. Publisher Copyright: © 2022 SPIE.

PY - 2022

Y1 - 2022

N2 - Microwave telescopes require an ever-increasing control of experimental systematics in their quest to measure the Cosmic Microwave Background (CMB) to exquisite levels of precision. One important systematic for ground and balloon-borne experiments is ground pickup, where beam sidelobes detect the thermal emission of the much warmer ground while the main beam is scanning the sky. This generates scan-synchronous noise in experiment timestreams, which is difficult to filter out without also deleting some of the signal from the sky. Therefore, efficient modelling of pickup can help guide the design of experiments and of analysis pipelines. In this work, we present an extension to the BEAMCONV algorithm that enables us to generate time-ordered data (TOD) from beam-convolved sky and ground maps simultaneously. We simulate ground pickup for both a ground-based experiment and a telescope attached to a stratospheric balloon. Ground templates for the balloon experiment are obtained by re-projecting satellite maps of the Earth's microwave emission.

AB - Microwave telescopes require an ever-increasing control of experimental systematics in their quest to measure the Cosmic Microwave Background (CMB) to exquisite levels of precision. One important systematic for ground and balloon-borne experiments is ground pickup, where beam sidelobes detect the thermal emission of the much warmer ground while the main beam is scanning the sky. This generates scan-synchronous noise in experiment timestreams, which is difficult to filter out without also deleting some of the signal from the sky. Therefore, efficient modelling of pickup can help guide the design of experiments and of analysis pipelines. In this work, we present an extension to the BEAMCONV algorithm that enables us to generate time-ordered data (TOD) from beam-convolved sky and ground maps simultaneously. We simulate ground pickup for both a ground-based experiment and a telescope attached to a stratospheric balloon. Ground templates for the balloon experiment are obtained by re-projecting satellite maps of the Earth's microwave emission.

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M3 - Conference contribution

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T3 - Proceedings of SPIE - The International Society for Optical Engineering

BT - Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XI

A2 - Zmuidzinas, Jonas

A2 - Gao, Jian-Rong

PB - SPIE

T2 - Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XI 2022

Y2 - 17 July 2022 through 22 July 2022

ER -

Modelling ground pickup for microwave telescopes

Abstract

Publication series

Conference

Bibliographical note

Other keywords

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Cite this