A LEKID-based CMB instrument design for large-scale observations in Greenland
We present the results of a feasibility study, which examined deployment of a ground-based millimeter-wave polarimeter, tailored for observing the cosmic microwave background (CMB), to Isi Station in Greenland. The instrument for this study is based on lumped-element kinetic inductance detectors (LE...
Published in: | SPIE Proceedings, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VII |
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Society of Photo-optical Instrumentation Engineers (SPIE)
2014
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Online Access: | https://doi.org/10.1117/12.2056828 |
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ftcaltechauth:oai:authors.library.caltech.edu:1jx1a-4xb42 2024-09-15T18:09:40+00:00 A LEKID-based CMB instrument design for large-scale observations in Greenland Araujo, D. C. Ade, P. A. R. Bond, J. R. Bradford, K. J. Chapman, D. Che, G. Day, P. K. Didier, J. Doyle, S. Eriksen, H. K. Flanigan, D. Groppi, C. E. Hillbrand, S. N. Johnson, B. R. Jones, G. Limon, M. Miller, A. D. Mauskopf, P. McCarrick, H. Mroczkowski, T. Reichborn-Kjennerud, B. Smiley, B. Sobrin, J. Wehus, I. K. Zmuidzinas, J. Holland, Wayne S. Zmuidzinas, Jonas 2014-08-19 https://doi.org/10.1117/12.2056828 unknown Society of Photo-optical Instrumentation Engineers (SPIE) https://doi.org/10.1117/12.2056828 oai:authors.library.caltech.edu:1jx1a-4xb42 eprintid:87286 resolverid:CaltechAUTHORS:20180620-163833764 info:eu-repo/semantics/openAccess Other SPIE Astronomical Telescopes + Instrumentation, Montréal, Canada, 22-27 June 2014 LEKIDs lumped-element kinetic inductance detectors cosmology CMB cosmic microwave back-ground polarization polarimetry half-wave plate superconducting magnetic bearing info:eu-repo/semantics/bookPart 2014 ftcaltechauth https://doi.org/10.1117/12.2056828 2024-08-06T15:34:59Z We present the results of a feasibility study, which examined deployment of a ground-based millimeter-wave polarimeter, tailored for observing the cosmic microwave background (CMB), to Isi Station in Greenland. The instrument for this study is based on lumped-element kinetic inductance detectors (LEKIDs) and an F/2.4 catoptric, crossed-Dragone telescope with a 500 mm aperture. The telescope is mounted inside the receiver and cooled to < 4 K by a closed-cycle ^4He refrigerator to reduce background loading on the detectors. Linearly polarized signals from the sky are modulated with a metal-mesh half-wave plate that is rotated at the aperture stop of the telescope with a hollow-shaft motor based on a superconducting magnetic bearing. The modular detector array design includes at least 2300 LEKIDs, and it can be configured for spectral bands centered on 150 GHz or greater. Our study considered configurations for observing in spectral bands centered on 150, 210 and 267 GHz. The entire polarimeter is mounted on a commercial precision rotary air bearing, which allows fast azimuth scan speeds with negligible vibration and mechanical wear over time. A slip ring provides power to the instrument, enabling circular scans (360 degrees of continuous rotation). This mount, when combined with sky rotation and the latitude of the observation site, produces a hypotrochoid scan pattern, which yields excellent cross-linking and enables 34% of the sky to be observed using a range of constant elevation scans. This scan pattern and sky coverage combined with the beam size (15 arcmin at 150 GHz) makes the instrument sensitive to 5 < ℓ < 1000 in the angular power spectra. © 2014 Society of Photo-Optical Instrumentation Engineers (SPIE). Published - 91530W.pdf Book Part Greenland Caltech Authors (California Institute of Technology) SPIE Proceedings, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VII 9153 91530W |
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Open Polar |
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Caltech Authors (California Institute of Technology) |
op_collection_id |
ftcaltechauth |
language |
unknown |
topic |
LEKIDs lumped-element kinetic inductance detectors cosmology CMB cosmic microwave back-ground polarization polarimetry half-wave plate superconducting magnetic bearing |
spellingShingle |
LEKIDs lumped-element kinetic inductance detectors cosmology CMB cosmic microwave back-ground polarization polarimetry half-wave plate superconducting magnetic bearing Araujo, D. C. Ade, P. A. R. Bond, J. R. Bradford, K. J. Chapman, D. Che, G. Day, P. K. Didier, J. Doyle, S. Eriksen, H. K. Flanigan, D. Groppi, C. E. Hillbrand, S. N. Johnson, B. R. Jones, G. Limon, M. Miller, A. D. Mauskopf, P. McCarrick, H. Mroczkowski, T. Reichborn-Kjennerud, B. Smiley, B. Sobrin, J. Wehus, I. K. Zmuidzinas, J. A LEKID-based CMB instrument design for large-scale observations in Greenland |
topic_facet |
LEKIDs lumped-element kinetic inductance detectors cosmology CMB cosmic microwave back-ground polarization polarimetry half-wave plate superconducting magnetic bearing |
description |
We present the results of a feasibility study, which examined deployment of a ground-based millimeter-wave polarimeter, tailored for observing the cosmic microwave background (CMB), to Isi Station in Greenland. The instrument for this study is based on lumped-element kinetic inductance detectors (LEKIDs) and an F/2.4 catoptric, crossed-Dragone telescope with a 500 mm aperture. The telescope is mounted inside the receiver and cooled to < 4 K by a closed-cycle ^4He refrigerator to reduce background loading on the detectors. Linearly polarized signals from the sky are modulated with a metal-mesh half-wave plate that is rotated at the aperture stop of the telescope with a hollow-shaft motor based on a superconducting magnetic bearing. The modular detector array design includes at least 2300 LEKIDs, and it can be configured for spectral bands centered on 150 GHz or greater. Our study considered configurations for observing in spectral bands centered on 150, 210 and 267 GHz. The entire polarimeter is mounted on a commercial precision rotary air bearing, which allows fast azimuth scan speeds with negligible vibration and mechanical wear over time. A slip ring provides power to the instrument, enabling circular scans (360 degrees of continuous rotation). This mount, when combined with sky rotation and the latitude of the observation site, produces a hypotrochoid scan pattern, which yields excellent cross-linking and enables 34% of the sky to be observed using a range of constant elevation scans. This scan pattern and sky coverage combined with the beam size (15 arcmin at 150 GHz) makes the instrument sensitive to 5 < ℓ < 1000 in the angular power spectra. © 2014 Society of Photo-Optical Instrumentation Engineers (SPIE). Published - 91530W.pdf |
author2 |
Holland, Wayne S. Zmuidzinas, Jonas |
format |
Book Part |
author |
Araujo, D. C. Ade, P. A. R. Bond, J. R. Bradford, K. J. Chapman, D. Che, G. Day, P. K. Didier, J. Doyle, S. Eriksen, H. K. Flanigan, D. Groppi, C. E. Hillbrand, S. N. Johnson, B. R. Jones, G. Limon, M. Miller, A. D. Mauskopf, P. McCarrick, H. Mroczkowski, T. Reichborn-Kjennerud, B. Smiley, B. Sobrin, J. Wehus, I. K. Zmuidzinas, J. |
author_facet |
Araujo, D. C. Ade, P. A. R. Bond, J. R. Bradford, K. J. Chapman, D. Che, G. Day, P. K. Didier, J. Doyle, S. Eriksen, H. K. Flanigan, D. Groppi, C. E. Hillbrand, S. N. Johnson, B. R. Jones, G. Limon, M. Miller, A. D. Mauskopf, P. McCarrick, H. Mroczkowski, T. Reichborn-Kjennerud, B. Smiley, B. Sobrin, J. Wehus, I. K. Zmuidzinas, J. |
author_sort |
Araujo, D. C. |
title |
A LEKID-based CMB instrument design for large-scale observations in Greenland |
title_short |
A LEKID-based CMB instrument design for large-scale observations in Greenland |
title_full |
A LEKID-based CMB instrument design for large-scale observations in Greenland |
title_fullStr |
A LEKID-based CMB instrument design for large-scale observations in Greenland |
title_full_unstemmed |
A LEKID-based CMB instrument design for large-scale observations in Greenland |
title_sort |
lekid-based cmb instrument design for large-scale observations in greenland |
publisher |
Society of Photo-optical Instrumentation Engineers (SPIE) |
publishDate |
2014 |
url |
https://doi.org/10.1117/12.2056828 |
genre |
Greenland |
genre_facet |
Greenland |
op_source |
SPIE Astronomical Telescopes + Instrumentation, Montréal, Canada, 22-27 June 2014 |
op_relation |
https://doi.org/10.1117/12.2056828 oai:authors.library.caltech.edu:1jx1a-4xb42 eprintid:87286 resolverid:CaltechAUTHORS:20180620-163833764 |
op_rights |
info:eu-repo/semantics/openAccess Other |
op_doi |
https://doi.org/10.1117/12.2056828 |
container_title |
SPIE Proceedings, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VII |
container_volume |
9153 |
container_start_page |
91530W |
_version_ |
1810447243393630208 |