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
|
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: | Schools > Physics and Astronomy |
| Subjects: | Q Science > QB Astronomy |
| Publisher: | SPIE |
| ISBN: | 9780819482235 |
| ISSN: | 0277-786X |
| Last Modified: | 24 Oct 2025 22:45 |
| URI: | https://orca.cardiff.ac.uk/id/eprint/33138 |
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