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The Primordial Inflation Polarization Explorer (PIPER): optical design

Eimer, Joseph R., Ade, Peter A. R., Benford, Dominic J., Bennett, Charles L., Chuss, David T., Fixsen, Dale J., Kogut, Alan J., Mirel, Paul, Tucker, Carole, 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 , vol. 7733. Bellingham, WA: SPIE, 77333B. 10.1117/12.857309

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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: 04 Jun 2017 04:07

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