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The Detector System for the Stratospheric Kinetic Inductance Polarimeter (Skip)

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Abstract

The stratospheric kinetic inductance polarimeter is a proposed balloon-borne experiment designed to study the cosmic microwave background, the cosmic infrared background and Galactic dust emission by observing 1,133 deg\(^2\) of sky in the Northern Hemisphere with launches from Kiruna, Sweden. The instrument contains 2,317 single-polarization, horn-coupled, aluminum lumped-element kinetic inductance detectors (Lekids). The Lekids will be maintained at 100 mK with an adiabatic demagnetization refrigerator. The polarimeter operates in two configurations, one sensitive to a spectral band centered on 150 GHz and the other sensitive to 260 and 350 GHz bands. The detector readout system is based on the ROACH-1 board, and the detectors will be biased below 300 MHz. The detector array is fed by an F/2.4 crossed-Dragone telescope with a 500 mm aperture yielding a 15 arcmin FWHM beam at 150 GHz. To minimize detector loading and maximize sensitivity, the entire optical system will be cooled to 1 K. Linearly polarized sky signals will be modulated with a metal-mesh half-wave plate that is mounted at the telescope aperture and rotated by a superconducting magnetic bearing. The observation program consists of at least two, 5-day flights beginning with the 150 GHz observations.

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Author information

Authors and Affiliations

  1. Department of Physics, Columbia University, New York, NY, 10027, USA

    B. R. Johnson, D. Araujo, K. J. Bradford, D. Chapman, J. Didier, D. Flanigan, S. Hillbrand, G. Jones, M. Limon, H. McCarrick, A. Miller, B. Reichborn-Kjennerud, B. Smiley & J. Sobrin

  2. Department of Physics, Arizona State University, Tempe, AZ, 85287, USA

    C. Groppi & P. Mauskopf

  3. Department of Physics, Caltech, Pasadena, CA, 91125, USA

    T. Mroczkowski & J. Zmuidzinas

  4. School of Physics and Astronomy, Cardiff University, Cardiff, Wales , CF243YB, UK

    P. A. R. Ade & S. Doyle

  5. Institute of Theoretical Astrophysics, University of Oslo, 0315 , Oslo, Norway

    H. K. Eriksen

  6. National Radio Astronomy Observatory, Charlottesville, VA, 22903, USA

    G. Jones

  7. Jet Propulsion Laboratory, Caltech, Pasadena, CA , 91109, USA

    P. K. Day, I. K. Wehus & J. Zmuidzinas

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  1. B. R. Johnson
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  2. P. A. R. Ade
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  7. J. Didier
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  9. H. K. Eriksen
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  11. C. Groppi
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  13. G. Jones
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  14. M. Limon
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  15. P. Mauskopf
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  16. H. McCarrick
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  17. A. Miller
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  18. T. Mroczkowski
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  19. B. Reichborn-Kjennerud
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  20. B. Smiley
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  21. J. Sobrin
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  22. I. K. Wehus
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  23. J. Zmuidzinas
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Corresponding author

Correspondence to B. R. Johnson.

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Johnson, B.R., Ade, P.A.R., Araujo, D. et al. The Detector System for the Stratospheric Kinetic Inductance Polarimeter (Skip). J Low Temp Phys 176, 741–748 (2014). https://doi.org/10.1007/s10909-013-1014-3

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  • DOI: https://doi.org/10.1007/s10909-013-1014-3

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