Latest results, current data-analysis and upcoming upgrades of the POLARBEAR/Simons Array experiments Dominic Beck (APC, Université Paris Diderot) on behalf of the POLARBEAR/Simons Array collaboration 53 rd Rencontres de Moriond, La Thuile, Italy 2018-03-18
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Latest results, current data-analysis and upcoming upgrades of the
POLARBEAR/Simons Array experiments
Dominic Beck (APC, Université Paris Diderot)
on behalf of the POLARBEAR/Simons Array collaboration
53rd Rencontres de Moriond, La Thuile, Italy 2018-03-18
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Context of CMB B-Mode Measurements
Cre
dits: Y
uji
Ch
ino
ne
large angular scales to targetmeasurement of tensor-to-scalar ratio r
to constrain Inflation theories
in the presence of galactic foregrounds, atmosphere emission and limited by instrumental
sensitivity, systematics, etc.
small angular scales to targetmeasurements of CMB lensing
tracing large-scale structure in the universe
restricted by instrumental sensitivity, resolution, systematics, astrophysical foregrounds, etc.
U. MelbourneFederico BianchiniChristian ReichardtAnh Pham
SISSACarlo BaccigalupiNicoletta
KrachmalnicoffDavide Poletti
UC IrvineChang Feng
Argonne NLAmy Bender
And many more in years past…
Laboratoire de l'accélérateur linéaireJulien Peloton
U Manchester
Gabriele Coppi
Andrew May
Lucio Piccirillo
U ChileMario Aguilar
C Computational AstrophysicsStephen Feeney
Stanford UGiuseppe Puglisi
UC Los Angeles
Nathan Whitehorn
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POLARBEAR Collaboration
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• Focal plane temperature 250 mK
• 1,274 TES bolometers at 150 GHz
• Lenslet-coupled double slot antennas
POLARBEAR-1
↑私
• Off-axis Gregorian-Dragone design
• 2.5 m primary mirror
• 3.5‘ FWHM beam
• Located in the Atacama desert, Chile
• 5,200 m above sea level
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B-Mode Measurement Campaigns of POLARBEAR-1
First light in Chile in January 2012
Initial science results•Reject null B-mode spectrum at 97.2% confidence level [POLARBEAR collaboration 2014c]• Lensing auto power spectrum from polarized CMB at 4.2 σ [POLARBEAR collaboration 2014a]•Cross correlation lensing power spectrum with CIB HERSCHEL-ATLAS at 4.0 σ [POLARBEAR
collaboration 2014b]
Second season results [POLARBEAR collaboration 2017]Installed continuously rotating half wave plateStarted large patch (20×35 degree) observations
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B-Mode Measurement Campaigns of POLARBEAR-1
RA12
RA4p5RA23
large patch
80 % of the sky observable by
POLARBEAR
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• Two-year observation of three 3×3 degree patches
• Adding 61 % of data volume to first season data: 5 𝜇𝐾-arcmin in deepest patch
• Improved calibration and instrumental systematic/foreground estimation
• Implementation of a second data analysis pipeline [Poletti et al 2017]
POLARBEAR-1 Second Season ResultsPOLARBEAR Collaboration ApJ 848, 121 (2017)
PIP
EL
INE
AP
IPE
LIN
E B
PLANCK temperature
(SMICA)
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The Data Analysis Pipeline
POLARBEAR-1 Second Season ResultsPOLARBEAR Collaboration ApJ 848, 121 (2017)
• Demonstrated 1/f noise suppression in [Takakura et al 2017]• B-mode power spectrum at degree angular-scales in preparation
Input polarizationOutput polarization
(Credits: Satoru Takakura)
ωt
Atmosphere produces noise in temperature which is correlated among detectors→ Low frequency (1/f) noise through T→P leakage challenging for large-scale B-mode
detection→ Continuously rotating half wave plate at prime focus, which modulates sky polarization
at 8 Hz→ Allows for subtraction of T→P leakage
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• Broadband sinuous antennas
• 7,588 bolometers observing in 95 GHz and 150 GHz band
• Nominal array sensitivity of 5.8 𝜇𝐾𝐶𝑀𝐵 𝑠(150 GHz) [Suzuki et al 2015]
• Broadband HWP at secondary focus [Hill and Beckman et al 2016]
POLARBEAR-2a
POLARBEAR-1
150 GHz
1,274 detectors
2.3° field-of-view
POLARBEAR-2
95/150 GHz
7,588 detectors
4.8° field-of-view
19 cm
36.5 cm
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• 3 receivers, 22,764 bolometers total, observing in four frequency bands
• Full array projected to achieve ~ 2.5 𝜇𝐾𝐶𝑀𝐵 𝑠
Simons Array
POLARBEAR-2a
95 / 150 GHz
POLARBEAR-2b
95 / 150 GHz
POLARBEAR-2c
220 / 270 GHz
currently housing POLARBEAR-1
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Will be deployed in a few months!
Will be deployed later this year
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• 3 receivers, 22,764 bolometers total, observing in four frequency bands