Wide field high cadence CMB survey designs for Chilean telescopes

Haruki Ebina; Reijo Keskitalo; Julian Borrill; Steve K. Choi; Theodore Kisner; Sigurd Naess; Michael Niemack; Jason R. Stevens

doi:10.1117/12.2629816

31 August 2022 Wide field high cadence CMB survey designs for Chilean telescopes

Haruki Ebina, Reijo Keskitalo, Julian Borrill, Steve K. Choi, Theodore Kisner, Sigurd Naess, Michael Niemack, Jason R. Stevens

Author Affiliations +

Proceedings Volume 12190, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XI; 121902R (2022) https://doi.org/10.1117/12.2629816
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Conference Poster

Abstract

We present new wide field survey strategies for Chilean Large Aperture Telescopes (LAT) measuring the Cosmic Microwave Background (CMB), which we call Sinusoidal Modulated High Cadence Survey Strategies. The strategies were developed during the process of optimizing LAT measurements for the CMB-S4, Simons Observatory, and CCAT-prime collaborations. Observing more than f_sky ∼0.5, the telescope consistently achieves high observation efficiency, even with Sun-avoidance enabled. Classical azimuthal scan survey strategies observing fields of equal size suffer from problems of observation depth non-uniformity relative to declination and lack of crosslinking. The new survey strategies described here significantly improve both uniformity and crosslinking while also enabling higher cadence observations for time-domain astrophysics. Uniformity and crosslinking are improved by modulation of azimuthal angular velocity and sinusoidal elevation nods, respectively. In particular, there is nearly uniform observation depth and crosslinking is improved from total lack of crosslinking near −40° declination to clearing the strictest thresholds for crosslinking across the entire field. The simulated strategies are compared to the strategies used for the Atacama Cosmology Telescope and previously studied Simons Observatory survey strategies.

Citation Download Citation

Haruki Ebina, Reijo Keskitalo, Julian Borrill, Steve K. Choi, Theodore Kisner, Sigurd Naess, Michael Niemack, and Jason R. Stevens "Wide field high cadence CMB survey designs for Chilean telescopes", Proc. SPIE 12190, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XI, 121902R (31 August 2022); https://doi.org/10.1117/12.2629816

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available