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Proceedings Paper

Optical characterization of the BICEP3 CMB polarimeter at the South Pole
Author(s): K. S. Karkare; 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. T. Fliescher; J. A. Grayson; M. Halpern; S. A. Harrison; G. C. Hilton; V. V. Hristov; H. Hui; K. D. Irwin; J. H. Kang; 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. L. Pryke; C. D. Reintsema; S. Richter; M. T. St. Germaine; R. Schwarz; 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. Weber; J. Willmert; C. L. Wong; W. L. K. Wu; K. W. Yoon
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Paper Abstract

BICEP3 is a small-aperture refracting cosmic microwave background (CMB) telescope designed to make sensitive polarization maps in pursuit of a potential B-mode signal from inflationary gravitational waves. It is the latest in the Bicep/Keck Array series of CMB experiments located at the South Pole, which has provided the most stringent constraints on inflation to date. For the 2016 observing season, BICEP3 was outfitted with a full suite of 2400 optically coupled detectors operating at 95 GHz. In these proceedings we report on the far field beam performance using calibration data taken during the 2015-2016 summer deployment season in situ with a thermal chopped source. We generate high-fidelity per-detector beam maps, show the array-averaged beam profile, and characterize the differential beam response between co-located, orthogonally polarized detectors which contributes to the leading instrumental systematic in pair differencing experiments. We find that the levels of differential pointing, beamwidth, and ellipticity are similar to or lower than those measured for Bicep2 and Keck Array. The magnitude and distribution of Bicep3’s differential beam mismatch – and the level to which temperature-to-polarization leakage may be marginalized over or subtracted in analysis - will inform the design of next-generation CMB experiments with many thousands of detectors.

Paper Details

Date Published: 20 July 2016
PDF: 17 pages
Proc. SPIE 9914, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VIII, 991430 (20 July 2016); doi: 10.1117/12.2231747
Show Author Affiliations
K. S. Karkare, Harvard-Smithsonian Ctr. for Astrophysics (United States)
P. A. R. Ade, Cardiff Univ. (United Kingdom)
Z. Ahmed, Stanford Univ. (United States)
Kavli Institute for Particle Astrophysics and Cosmology
SLAC National Accelerator Lab. (United States)
K. D. Alexander, Harvard-Smithsonian Ctr. for Astrophysics (United States)
M. Amiri, The Univ. of British Columbia (Canada)
D. Barkats, Harvard-Smithsonian Ctr. for Astrophysics (United States)
S. J. Benton, Univ. of Toronto (Canada)
C. A. Bischoff, Harvard-Smithsonian Ctr. for Astrophysics (United States)
J. J. Bock, California Institute of Technology (United States)
Jet Propulsion Lab. (United States)
H. Boenish, Harvard-Smithsonian Ctr. for Astrophysics (United States)
R. Bowens-Rubin, Harvard-Smithsonian Ctr. for Astrophysics (United States)
I. Buder, Harvard-Smithsonian Ctr. for Astrophysics (United States)
E. Bullock, Univ. of Minnesota (United States)
V. Buza, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Harvard Univ. (United States)
J. Connors, Harvard-Smithsonian Ctr. for Astrophysics (United States)
J. P. Filippini, California Institute of Technology (United States)
Univ. of Illinois at Urbana-Champaign (United States)
S. T. Fliescher, Univ. of Minnesota (United States)
J. A. Grayson, Stanford Univ. (United States)
Kavli Institute for Particle Astrophysics and Cosmology (United States)
SLAC National Accelerator Lab. (United States)
M. Halpern, The Univ. of British Columbia (Canada)
S. A. Harrison, Harvard-Smithsonian Ctr. for Astrophysics (United States)
G. C. Hilton, National Institute of Standards and Technology (United States)
V. V. Hristov, California Institute of Technology (United States)
H. Hui, California Institute of Technology (United States)
K. D. Irwin, Stanford Univ. (United States)
Kavli Institute for Particle Astrophysics and Cosmology (United States)
SLAC National Accelerator Lab. and National Institute for Standards and Technology (United States)
J. H. Kang, Stanford Univ. (United States)
Kavli Institute for Particle Astrophysics and Cosmology (United States)
SLAC National Accelerator Lab. (United States)
E. Karpel, Stanford Univ. (United States)
S. Kefeli, California Institute of Technology (United States)
S. A. Kernasovskiy, Stanford Univ. (United States)
J. M. Kovac, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Harvard Univ. (United States)
C. L. Kuo, Stanford Univ. (United States)
Kavli Institute for Particle Astrophysics and Cosmology (United States)
SLAC National Accelerator Lab. (United States)
E. M. Leitch, The Univ. of Chicago (United States)
M. Lueker, California Institute of Technology (United States)
K. G. Megerian, Jet Propulsion Lab. (United States)
V. Monticue, Stanford Univ. (United States)
T. Namikawa, Stanford Univ. (United States)
Kavli Institute for Particle Astrophysics and Cosmology (United States)
SLAC National Accelerator Lab. (United States)
C. B. Netterfield, Univ. of Toronto (Canada)
Canadian Institute for Advanced Research (Canada)
H. T. Nguyen, Jet Propulsion Lab. (United States)
R. O'Brient, Jet Propulsion Lab. (United States)
R. W. Ogburn, Stanford Univ. (United States)
Kavli Institute for Particle Astrophysics and Cosmology (United States)
SLAC National Accelerator Lab. (United States)
C. L. Pryke, Univ. of Minnesota (United States)
C. D. Reintsema, National Institute of Standards and Technology (United States)
S. Richter, Harvard-Smithsonian Ctr. for Astrophysics (United States)
M. T. St. Germaine, Harvard-Smithsonian Ctr. for Astrophysics (United States)
R. Schwarz, Univ. of Minnesota, Twin Cities (United States)
C. D. Sheehy, The Univ. of Chicago (United States)
Z. K. Staniszewski, California Institute of Technology (United States)
Jet Propulsion Lab. (United States)
B. Steinbach, California Institute of Technology (United States)
G. P. Teply, California Institute of Technology (United States)
K. L. Thompson, Stanford Univ. (United States)
Kavli Institute for Particle Astrophysics and Cosmology (United States)
SLAC National Accelerator Lab. (United States)
J. E. Tolan, Stanford Univ. (United States)
Kavli Institute for Particle Astrophysics and Cosmology (United States)
SLAC National Accelerator Lab. (United States)
C. Tucker, Cardiff Univ. (United Kingdom)
A. D. Turner, Jet Propulsion Lab. (United States)
A. G. Vieregg, Harvard-Smithsonian Ctr. for Astrophysics (United States)
The Univ. of Chicago (United States)
A. Wandui, Stanford Univ. (United States)
Kavli Institute for Particle Astrophysics and Cosmology (United States)
SLAC National Accelerator Lab. (United States)
A. Weber, Jet Propulsion Lab. (United States)
J. Willmert, Univ. of Minnesota (United States)
C. L. Wong, Harvard-Smithsonian Ctr. for Astrophysics (United States)
W. L. K. Wu, Univ. of California, Berkeley (United States)
Stanford Univ. (United States)
Kavli Institute for Particle Astrophysics and Cosmology and SLAC National Accelerator Lab. (United States)
K. W. Yoon, Stanford Univ. (United States)
Kavli Institute for Particle Astrophysics and Cosmology (United States)
SLAC National Accelerator Lab. (United States)


Published in SPIE Proceedings Vol. 9914:
Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VIII
Wayne S. Holland; Jonas Zmuidzinas, Editor(s)

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