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

Araujo, D. C. and Ade, P. A. R. and Bond, J. R. and Bradford, K. J. and Chapman, D. and Che, G. and Day, P. K. and Didier, J. and Doyle, S. and Eriksen, H. K. and Flanigan, D. and Groppi, C. E. and Hillbrand, S. N. and Johnson, B. R. and Jones, G. and Limon, M. and Miller, A. D. and Mauskopf, P. and McCarrick, H. and Mroczkowski, T. and Reichborn-Kjennerud, B. and Smiley, B. and Sobrin, J. and Wehus, I. K. and Zmuidzinas, J. (2014) A LEKID-based CMB instrument design for large-scale observations in Greenland. In: Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VII. Proceedings of SPIE. No.9153. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 91530W. ISBN 9780819496218.

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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.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Ade, P. A. R.0000-0002-5127-0401
Bond, J. R.0000-0003-2358-9949
Jones, G.0000-0002-0267-9024
Limon, M.0000-0002-5900-2698
Mauskopf, P.0000-0001-6397-5516
Mroczkowski, T.0000-0003-3816-5372
Additional Information:© 2014 Society of Photo-Optical Instrumentation Engineers (SPIE).
Subject Keywords:LEKIDs, lumped-element kinetic inductance detectors, cosmology, CMB, cosmic microwave back-ground polarization, polarimetry, half-wave plate, superconducting magnetic bearing
Series Name:Proceedings of SPIE
Issue or Number:9153
Record Number:CaltechAUTHORS:20180620-163833764
Persistent URL:
Official Citation: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, C. E. Groppi, Seth N. Hillbrand, B. R. Johnson, G. Jones, Michele Limon, A. D. Miller, P. Mauskopf, H. McCarrick, T. Mroczkowski, B. Reichborn-Kjennerud, B. Smiley, Joshua Sobrin, I. K. Wehus, J. Zmuidzinas, "A LEKID-based CMB instrument design for large-scale observations in Greenland", Proc. SPIE 9153, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VII, 91530W (19 August 2014); doi: 10.1117/12.2056828;
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:87286
Deposited By: George Porter
Deposited On:21 Jun 2018 14:00
Last Modified:30 Oct 2020 21:49

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