15 July 2016 Survey strategy optimization for the Atacama Cosmology Telescope
Author Affiliations +
In recent years there have been significant improvements in the sensitivity and the angular resolution of the instruments dedicated to the observation of the Cosmic Microwave Background (CMB). ACTPol is the first polarization receiver for the Atacama Cosmology Telescope (ACT) and is observing the CMB sky with arcmin resolution over 2000 sq. deg. Its upgrade, Advanced ACTPol (AdvACT), will observe the CMB in five frequency bands and over a larger area of the sky. We describe the optimization and implementation of the ACTPol and AdvACT surveys. The selection of the observed fields is driven mainly by the science goals, that is, small angular scale CMB measurements, B-mode measurements and cross-correlation studies. For the ACTPol survey we have observed patches of the southern galactic sky with low galactic foreground emissions which were also chosen to maximize the overlap with several galaxy surveys to allow unique cross-correlation studies. A wider field in the northern galactic cap ensured significant additional overlap with the BOSS spectroscopic survey. The exact shapes and footprints of the fields were optimized to achieve uniform coverage and to obtain cross-linked maps by observing the fields with different scan directions. We have maximized the efficiency of the survey by implementing a close to 24 hour observing strategy, switching between daytime and nighttime observing plans and minimizing the telescope idle time. We describe the challenges represented by the survey optimization for the significantly wider area observed by AdvACT, which will observe roughly half of the low-foreground sky. The survey strategies described here may prove useful for planning future ground-based CMB surveys, such as the Simons Observatory and CMB Stage IV surveys.
© (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
F. De Bernardis, F. De Bernardis, J. R. Stevens, J. R. Stevens, M. Hasselfield, M. Hasselfield, D. Alonso, D. Alonso, J. R. Bond, J. R. Bond, E. Calabrese, E. Calabrese, S. K. Choi, S. K. Choi, K. T. Crowley, K. T. Crowley, M. Devlin, M. Devlin, J. Dunkley, J. Dunkley, P. A. Gallardo, P. A. Gallardo, S. W. Henderson, S. W. Henderson, M. Hilton, M. Hilton, R. Hlozek, R. Hlozek, S. P. Ho, S. P. Ho, K. Huffenberger, K. Huffenberger, B. J. Koopman, B. J. Koopman, A. Kosowsky, A. Kosowsky, T. Louis, T. Louis, M. S. Madhavacheril, M. S. Madhavacheril, J. McMahon, J. McMahon, S. Næss, S. Næss, F. Nati, F. Nati, L. Newburgh, L. Newburgh, M. D. Niemack, M. D. Niemack, L. A. Page, L. A. Page, M. Salatino, M. Salatino, A. Schillaci, A. Schillaci, B. L. Schmitt, B. L. Schmitt, N. Sehgal, N. Sehgal, J. L. Sievers, J. L. Sievers, S. M. Simon, S. M. Simon, D. N. Spergel, D. N. Spergel, S. T. Staggs, S. T. Staggs, A. van Engelen, A. van Engelen, E. M. Vavagiakis, E. M. Vavagiakis, E. J. Wollack, E. J. Wollack, "Survey strategy optimization for the Atacama Cosmology Telescope", Proc. SPIE 9910, Observatory Operations: Strategies, Processes, and Systems VI, 991014 (15 July 2016); doi: 10.1117/12.2232824; https://doi.org/10.1117/12.2232824


SPICE EUV spectrometer for the Solar Orbiter mission
Proceedings of SPIE (September 25 2013)
Optical alignment of the SPICE EUV imaging spectrometer
Proceedings of SPIE (September 22 2015)
Imaging three-dimensional heliosphere in EUV
Proceedings of SPIE (August 18 2005)
GOES solar x-ray imager: overview and operational goals
Proceedings of SPIE (October 17 1996)
The STEREO SECCHI/EUVI EUV coronal imager
Proceedings of SPIE (September 11 2007)

Back to Top