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The Primordial Inflation Polarization Explorer (PIPER): optical design

Eimer, Joseph R., Ade, Peter A. R. ORCID: https://orcid.org/0000-0002-5127-0401, Benford, Dominic J., Bennett, Charles L., Chuss, David T., Fixsen, Dale J., Kogut, Alan J., Mirel, Paul, Tucker, Carole ORCID: https://orcid.org/0000-0002-1851-3918, Voellmer, George M. and Wollack, Edward J. 2010. The Primordial Inflation Polarization Explorer (PIPER): optical design. Presented at: Ground-based and airborne telescopes 3, San Diego, CA, USA, 27 June-2 July 2010. Published in: Stepp, Larry M., Gilmozzi, Roberto and Hall, Helen J. eds. Ground-based and airborne telescopes III: 27 June-2 July 2010, San Diego, California, United States. Proceedings of SPIE (7733) Bellingham, WA: SPIE, 77333B. 10.1117/12.857309

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Abstract

The balloon-borne PIPER instrument will observe the polarization in the cosmic microwave background (CMB) at 200, 270, 350, and 600 GHz. Two co-pointed telescopes are placed inside a 3000 L liquid helium dewar and cooled to 1.5 K. The telescopes are arranged so that one measures Stokes parameters Q and V while the other measures U and V . Each telescope consists of a variable-delay polarization modulator (VPM) as the primary optical element, two off-axis mirrors, a folding flat, and re-imaging optics with off-axis lenses that focus each of the orthogonal linear polarization signals through an analyzer grid and onto two bolometer arrays (one for each polarization state). A cold Lyot stop is imaged onto the VPM to define the entrance pupil of the telescope. Each telescope has a 6° × 4.7° field-of-view.

Item Type: Conference or Workshop Item (Paper)
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Publisher: SPIE
ISBN: 9780819482235
ISSN: 0277-786X
Last Modified: 20 Oct 2022 09:48
URI: https://orca.cardiff.ac.uk/id/eprint/33138

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