GroundBIRD: an experiment for CMB polarization measurements at a large angular scale from the ground

2012 ◽  
Author(s):  
Osamu Tajima ◽  
Jhoon Choi ◽  
Masashi Hazumi ◽  
Hikaru Ishitsuka ◽  
Masanori Kawai ◽  
...  
Keyword(s):  
Polarization Measurements ◽  
Angular Scale ◽  
Cmb Polarization

scholarly journals Status of CMB polarization measurements from DASI and other experiments

2003 ◽  
Vol 47 (11-12) ◽  
pp. 953-966 ◽  
Author(s):  
J.E. Carlstrom ◽  
J. Kovac ◽  
E.M. Leitch ◽  
C. Pryke
Keyword(s):  
Polarization Measurements ◽  
Cmb Polarization

scholarly journals SPTpol: an instrument for CMB polarization measurements with the South Pole Telescope

2012 ◽  
Author(s):  
J. E. Austermann ◽  
K. A. Aird ◽  
J. A. Beall ◽  
D. Becker ◽  
A. Bender ◽  
...  
Keyword(s):  
South Pole ◽  
The South ◽  
Polarization Measurements ◽  
South Pole Telescope ◽  
Cmb Polarization

GroundBIRD Experiment: Detecting CMB Polarization Power in a Large Angular Scale from the Ground

2014 ◽  
Vol 176 (5-6) ◽  
pp. 691-697 ◽  
Author(s):  
S. Oguri ◽  
◽  
J. Choi ◽  
M. Hazumi ◽  
M. Kawai ◽  
...  
Keyword(s):  
Angular Scale ◽  
Cmb Polarization ◽  
Polarization Power

scholarly journals Two Year Cosmology Large Angular Scale Surveyor (CLASS) Observations: Long Timescale Stability Achieved with a Front-end Variable-delay Polarization Modulator at 40 GHz

2021 ◽  
Vol 922 (2) ◽  
pp. 212
Author(s):  
Kathleen Harrington ◽  
Rahul Datta ◽  
Keisuke Osumi ◽  
Aamir Ali ◽  
John W. Appel ◽  
...  
Keyword(s):  
Focal Plane ◽  
Optical Element ◽  
Precipitable Water ◽  
Variable Delay ◽  
Microwave Background ◽  
Polarization Modulator ◽  
Front End ◽  
Angular Scale ◽  
Cmb Polarization ◽  
Low Levels

Abstract The Cosmology Large Angular Scale Surveyor (CLASS) is a four-telescope array observing the largest angular scales (2≲ ℓ ≲ 200) of the cosmic microwave background (CMB) polarization. These scales encode information about reionization and inflation during the early universe. The instrument stability necessary to observe these angular scales from the ground is achieved through the use of a variable-delay polarization modulator as the first optical element in each of the CLASS telescopes. Here, we develop a demodulation scheme used to extract the polarization timestreams from the CLASS data and apply this method to selected data from the first 2 yr of observations by the 40 GHz CLASS telescope. These timestreams are used to measure the 1/f noise and temperature-to-polarization (T → P) leakage present in the CLASS data. We find a median knee frequency for the pair-differenced demodulated linear polarization of 15.12 mHz and a T → P leakage of <3.8 × 10−4 (95% confidence) across the focal plane. We examine the sources of 1/f noise present in the data and find the component of 1/f due to atmospheric precipitable water vapor (PWV) has an amplitude of 203 ± 12 μ K RJ s for 1 mm of PWV when evaluated at 10 mHz; accounting for ∼17% of the 1/f noise in the central pixels of the focal plane. The low levels of T → P leakage and 1/f noise achieved through the use of a front-end polarization modulator are requirements for observing of the largest angular scales of the CMB polarization by the CLASS telescopes.

On-site performance of GroundBIRD, a CMB polarization telescope for large angular scale observations

2020 ◽  
Author(s):  
Shunsuke Honda ◽  
Jihoon Choi ◽  
Ricardo T. Génova-Santos ◽  
Makoto Hattori ◽  
Masashi Hazumi ◽  
...  
Keyword(s):  
Angular Scale ◽  
Cmb Polarization

scholarly journals Feedhorn-coupled TES polarimeter camera modules at 150 GHz for CMB polarization measurements with SPTpol

2012 ◽  
Author(s):  
J. W. Henning ◽  
P. Ade ◽  
K. A. Aird ◽  
J. E. Austermann ◽  
J. A. Beall ◽  
...  
Keyword(s):  
Polarization Measurements ◽  
Cmb Polarization

High stability and sensitivity correlation polarimeters for CMB polarization measurements

2004 ◽  
Author(s):  
Ettore Carretti ◽  
Stefano Cortiglioni ◽  
Claudio Macculi ◽  
Carla Sbarra ◽  
Giulio Ventura ◽  
...  
Keyword(s):  
High Stability ◽  
Polarization Measurements ◽  
Cmb Polarization
Sign in / Sign up

Export Citation Format

Share Document