BICEP3 performance overview and planned Keck Array upgrade

J. A. Grayson, P. A.R. Ade, Z. Ahmed, K. D. Alexander, M. Amiri, D. Barkats, S. J. Benton, C. A. Bischoff, J. J. Bock, H. Boenish, R. Bowens-Rubin, I. Buder, E. Bullock, V. Buza, J. Connors, J. P. Filippini, S. Fliescher, M. Halpern, S. Harrison, G. C. HiltonV. V. Hristov, H. Hui, K. D. Irwin, J. Kang, K. S. Karkare, E. Karpel, S. Kefeli, S. A. Kernasovskiy, J. M. Kovac, C. L. Kuo, E. M. Leitch, M. Lueker, K. G. Megerian, V. Monticue, T. Namikawa, C. B. Netterfield, H. T. Nguyen, R. O'Brient, R. W. Ogburn, C. Pryke, C. D. Reintsema, S. Richter, R. Schwarz, C. Sorenson, C. D. Sheehy, Z. K. Staniszewski, B. Steinbach, G. P. Teply, K. L. Thompson, J. E. Tolan, C. Tucker, A. D. Turner, A. G. Vieregg, A. Wandui, A. C. Weber, D. V. Wiebe, J. Willmert, W. L.K. Wu, K. W. Yoon

Research output: Chapter in Book/Report/Conference proceedingConference contribution

55 Scopus citations


Bicep3 is a 520mm aperture, compact two-lens refractor designed to observe the polarization of the cosmic microwave background (CMB) at 95 GHz. Its focal plane consists of modularized tiles of antenna-coupled transition edge sensors (TESs), similar to those used in Bicep2 and the Keck Array. The increased per-receiver optical throughput compared to Bicep2/Keck Array, due to both its faster f=1:7 optics and the larger aperture, more than doubles the combined mapping speed of the Bicep/Keck program. The Bicep3 receiver was recently upgraded to a full complement of 20 tiles of detectors (2560 TESs) and is now beginning its second year of observation (and first science season) at the South Pole. We report on its current performance and observing plans. Given its high per-receiver throughput while maintaining the advantages of a compact design, Bicep3- class receivers are ideally suited as building blocks for a 3rd-generation CMB experiment, consisting of multiple receivers spanning 35 GHz to 270 GHz with total detector count in the tens of thousands. We present plans for such an array, the new "BICEP Array" that will replace the Keck Array at the South Pole, including design optimization, frequency coverage, and deployment/observing strategies.

Original languageEnglish (US)
Title of host publicationMillimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VIII
EditorsJonas Zmuidzinas, Wayne S. Holland
ISBN (Electronic)9781510602076
StatePublished - 2016
EventMillimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VIII - Edinburgh, United Kingdom
Duration: Jun 28 2016Jul 1 2016

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


OtherMillimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VIII
Country/TerritoryUnited Kingdom

Bibliographical note

Publisher Copyright:
© 2016 SPIE.


  • Cosmic Microwave Background
  • Gravitational Waves
  • Inflation
  • Keck Array
  • Polarization


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