Optical Performance of the BICEP2 Telescope at the South Pole
Bicep2 deployed to the South Pole during the 2009-2010 austral summer, and is now mapping the polarization of the cosmic microwave background (CMB), searching for evidence of inflationary cosmology. Bicep2 belongs to a new class of telescopes including Keck (ground-based) and Spider (balloon-borne)...
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ftcaltechauth:oai:authors.library.caltech.edu:22833 2023-05-15T18:22:03+02:00 Optical Performance of the BICEP2 Telescope at the South Pole Aikin, Randol W. Bock, J. J. Brevik, J. A. Dowell, C. D. Filippini, J. P. Golwala, S. R. Hristov, V. V. Lange, A. E. Nguyen, H. T. Orlando, A. Richter, S. Runyan, M. C. Teply, G. P. Holland, Wayne S. Zmuidzinas, Jonas 2010-07-15 application/pdf https://authors.library.caltech.edu/22833/ https://authors.library.caltech.edu/22833/1/Aikin2010p12899Adaptive_Optics_Systems_Pts_1-3.pdf https://resolver.caltech.edu/CaltechAUTHORS:20110311-145009599 en eng Society of Photo-optical Instrumentation Engineers (SPIE) https://authors.library.caltech.edu/22833/1/Aikin2010p12899Adaptive_Optics_Systems_Pts_1-3.pdf Aikin, Randol W. and Bock, J. J. and Brevik, J. A. and Dowell, C. D. and Filippini, J. P. and Golwala, S. R. and Hristov, V. V. and Lange, A. E. and Nguyen, H. T. and Orlando, A. and Richter, S. and Runyan, M. C. and Teply, G. P. (2010) Optical Performance of the BICEP2 Telescope at the South Pole. In: Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy V. Proceedings of SPIE. No.7741. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 77410V. ISBN 978-0-81948-231-0. https://resolver.caltech.edu/CaltechAUTHORS:20110311-145009599 <https://resolver.caltech.edu/CaltechAUTHORS:20110311-145009599> other Book Section PeerReviewed 2010 ftcaltechauth 2021-11-11T18:46:24Z Bicep2 deployed to the South Pole during the 2009-2010 austral summer, and is now mapping the polarization of the cosmic microwave background (CMB), searching for evidence of inflationary cosmology. Bicep2 belongs to a new class of telescopes including Keck (ground-based) and Spider (balloon-borne) that follow on Bicep's strategy of employing small, cold, on-axis refracting optics. This common design provides key advantages ideal for targeting the polarization signature from inflation, including: (i) A large field of view, allowing substantial light collecting power despite the small aperture, while still resolving the degree-scale polarization of the CMB; (ii) liquid helium-cooled optics and cold stop, allowing for low, stable instrument loading; (iii) the ability to rotate the entire telescope about the boresight; (iv) a baffled primary aperture, reducing sidelobe pickup; and (v) the ability to characterize the far field optical performance of the telescope using ground-based sources. We describe the last of these advantages in detail, including our efforts to measure the main beam shape, beammatch between orthogonally-polarized pairs, polarization efficiency and response angle, sidelobe pickup, and ghost imaging. We do so with ground-based polarized microwave sources mounted in the far field as well as with astronomical calibrators. Ultimately, Bicep2's sensitivity to CMB polarization from inflation will rely on precise calibration of these beam features. Book Part South pole Caltech Authors (California Institute of Technology) Austral South Pole |
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Caltech Authors (California Institute of Technology) |
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ftcaltechauth |
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English |
description |
Bicep2 deployed to the South Pole during the 2009-2010 austral summer, and is now mapping the polarization of the cosmic microwave background (CMB), searching for evidence of inflationary cosmology. Bicep2 belongs to a new class of telescopes including Keck (ground-based) and Spider (balloon-borne) that follow on Bicep's strategy of employing small, cold, on-axis refracting optics. This common design provides key advantages ideal for targeting the polarization signature from inflation, including: (i) A large field of view, allowing substantial light collecting power despite the small aperture, while still resolving the degree-scale polarization of the CMB; (ii) liquid helium-cooled optics and cold stop, allowing for low, stable instrument loading; (iii) the ability to rotate the entire telescope about the boresight; (iv) a baffled primary aperture, reducing sidelobe pickup; and (v) the ability to characterize the far field optical performance of the telescope using ground-based sources. We describe the last of these advantages in detail, including our efforts to measure the main beam shape, beammatch between orthogonally-polarized pairs, polarization efficiency and response angle, sidelobe pickup, and ghost imaging. We do so with ground-based polarized microwave sources mounted in the far field as well as with astronomical calibrators. Ultimately, Bicep2's sensitivity to CMB polarization from inflation will rely on precise calibration of these beam features. |
author2 |
Holland, Wayne S. Zmuidzinas, Jonas |
format |
Book Part |
author |
Aikin, Randol W. Bock, J. J. Brevik, J. A. Dowell, C. D. Filippini, J. P. Golwala, S. R. Hristov, V. V. Lange, A. E. Nguyen, H. T. Orlando, A. Richter, S. Runyan, M. C. Teply, G. P. |
spellingShingle |
Aikin, Randol W. Bock, J. J. Brevik, J. A. Dowell, C. D. Filippini, J. P. Golwala, S. R. Hristov, V. V. Lange, A. E. Nguyen, H. T. Orlando, A. Richter, S. Runyan, M. C. Teply, G. P. Optical Performance of the BICEP2 Telescope at the South Pole |
author_facet |
Aikin, Randol W. Bock, J. J. Brevik, J. A. Dowell, C. D. Filippini, J. P. Golwala, S. R. Hristov, V. V. Lange, A. E. Nguyen, H. T. Orlando, A. Richter, S. Runyan, M. C. Teply, G. P. |
author_sort |
Aikin, Randol W. |
title |
Optical Performance of the BICEP2 Telescope at the South Pole |
title_short |
Optical Performance of the BICEP2 Telescope at the South Pole |
title_full |
Optical Performance of the BICEP2 Telescope at the South Pole |
title_fullStr |
Optical Performance of the BICEP2 Telescope at the South Pole |
title_full_unstemmed |
Optical Performance of the BICEP2 Telescope at the South Pole |
title_sort |
optical performance of the bicep2 telescope at the south pole |
publisher |
Society of Photo-optical Instrumentation Engineers (SPIE) |
publishDate |
2010 |
url |
https://authors.library.caltech.edu/22833/ https://authors.library.caltech.edu/22833/1/Aikin2010p12899Adaptive_Optics_Systems_Pts_1-3.pdf https://resolver.caltech.edu/CaltechAUTHORS:20110311-145009599 |
geographic |
Austral South Pole |
geographic_facet |
Austral South Pole |
genre |
South pole |
genre_facet |
South pole |
op_relation |
https://authors.library.caltech.edu/22833/1/Aikin2010p12899Adaptive_Optics_Systems_Pts_1-3.pdf Aikin, Randol W. and Bock, J. J. and Brevik, J. A. and Dowell, C. D. and Filippini, J. P. and Golwala, S. R. and Hristov, V. V. and Lange, A. E. and Nguyen, H. T. and Orlando, A. and Richter, S. and Runyan, M. C. and Teply, G. P. (2010) Optical Performance of the BICEP2 Telescope at the South Pole. In: Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy V. Proceedings of SPIE. No.7741. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 77410V. ISBN 978-0-81948-231-0. https://resolver.caltech.edu/CaltechAUTHORS:20110311-145009599 <https://resolver.caltech.edu/CaltechAUTHORS:20110311-145009599> |
op_rights |
other |
_version_ |
1766201409746763776 |