A LEKID-based CMB instrument design for large-scale observations in Greenland

D. C. Araujo, P. A R Ade, J. R. Bond, K. J. Bradford, D. Chapman, G. Che, P. K. Day, J. Didier, S. Doyle, H. K. Eriksen, D. Flanigan, Christopher Groppi, Seth N. Hillbrand, B. R. Johnson, G. Jones, Michele Limon, A. D. Miller, Philip Mauskopf, H. McCarrick, T. MroczkowskiB. Reichborn-Kjennerud, B. Smiley, Joshua Sobrin, I. K. Wehus, J. Zmuidzinas

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Citations (Scopus)

Abstract

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 < ' < 1000 in the angular power spectra.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
PublisherSPIE
Volume9153
ISBN (Print)9780819496218
DOIs
StatePublished - 2014
EventMillimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VII - Montreal, Canada
Duration: Jun 24 2014Jun 27 2014

Other

OtherMillimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VII
CountryCanada
CityMontreal
Period6/24/146/27/14

Fingerprint

Inductance
Greenland
inductance
Microwave
sky
Kinetics
Microwaves
Detector
Telescopes
Detectors
Telescope
microwaves
Polarimeter
Polarimeters
detectors
kinetics
telescopes
polarimeters
spectral bands
Hypotrochoid

Keywords

  • CMB
  • cosmic microwave back-ground polarization
  • cosmology
  • half-wave plate
  • LEKIDs
  • lumped-element kinetic inductance detectors
  • polarimetry
  • superconducting magnetic bearing

ASJC Scopus subject areas

  • Applied Mathematics
  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Araujo, D. C., Ade, P. A. R., Bond, J. R., Bradford, K. J., Chapman, D., Che, G., ... Zmuidzinas, J. (2014). A LEKID-based CMB instrument design for large-scale observations in Greenland. In Proceedings of SPIE - The International Society for Optical Engineering (Vol. 9153). [91530W] SPIE. https://doi.org/10.1117/12.2056828

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, Christopher; Hillbrand, Seth N.; Johnson, B. R.; Jones, G.; Limon, Michele; Miller, A. D.; Mauskopf, Philip; McCarrick, H.; Mroczkowski, T.; Reichborn-Kjennerud, B.; Smiley, B.; Sobrin, Joshua; Wehus, I. K.; Zmuidzinas, J.

Proceedings of SPIE - The International Society for Optical Engineering. Vol. 9153 SPIE, 2014. 91530W.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Araujo, DC, Ade, PAR, Bond, JR, Bradford, KJ, Chapman, D, Che, G, Day, PK, Didier, J, Doyle, S, Eriksen, HK, Flanigan, D, Groppi, C, Hillbrand, SN, Johnson, BR, Jones, G, Limon, M, Miller, AD, Mauskopf, P, McCarrick, H, Mroczkowski, T, Reichborn-Kjennerud, B, Smiley, B, Sobrin, J, Wehus, IK & Zmuidzinas, J 2014, A LEKID-based CMB instrument design for large-scale observations in Greenland. in Proceedings of SPIE - The International Society for Optical Engineering. vol. 9153, 91530W, SPIE, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VII, Montreal, Canada, 6/24/14. https://doi.org/10.1117/12.2056828
Araujo DC, Ade PAR, Bond JR, Bradford KJ, Chapman D, Che G et al. A LEKID-based CMB instrument design for large-scale observations in Greenland. In Proceedings of SPIE - The International Society for Optical Engineering. Vol. 9153. SPIE. 2014. 91530W https://doi.org/10.1117/12.2056828
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, Christopher ; Hillbrand, Seth N. ; Johnson, B. R. ; Jones, G. ; Limon, Michele ; Miller, A. D. ; Mauskopf, Philip ; McCarrick, H. ; Mroczkowski, T. ; Reichborn-Kjennerud, B. ; Smiley, B. ; Sobrin, Joshua ; Wehus, I. K. ; Zmuidzinas, J. / A LEKID-based CMB instrument design for large-scale observations in Greenland. Proceedings of SPIE - The International Society for Optical Engineering. Vol. 9153 SPIE, 2014.
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abstract = "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 < ' < 1000 in the angular power spectra.",
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AU - Didier, J.

AU - Doyle, S.

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AU - Hillbrand, Seth N.

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AU - Wehus, I. K.

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N2 - 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 < ' < 1000 in the angular power spectra.

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