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Title: The Atacama Cosmology Telescope: The Polarization-Sensitive ACTPol Instrument

The Atacama Cosmology Telescope (ACT) makes high angular resolution measurements of anisotropies in the Cosmic Microwave Background (CMB) at millimeter wavelengths. We describe ACTPol, an upgraded receiver for ACT, which uses feedhorn-coupled, polarization-sensitive detector arrays, a 3° field of view, 100 mK cryogenics with continuous cooling, and meta material antireflection coatings. ACTPol comprises three arrays with separate cryogenic optics: two arrays at a central frequency of 148 GHz and one array operating simultaneously at both 97 GHz and 148 GHz. The combined instrument sensitivity, angular resolution, and sky coverage are optimized for measuring angular power spectra, clusters via the thermal Sunyaev–Zel'dovich (SZ) and kinetic SZ signals, and CMB lensing due to large-scale structure. The receiver was commissioned with its first 148 GHz array in 2013, observed with both 148 GHz arrays in 2014, and has recently completed its first full season of operations with the full suite of three arrays. This paper provides an overview of the design and initial performance of the receiver and related systems.
Authors:
ORCiD logo [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [6] ;  [7] ;  [8] ;  [9] ;  [10] ;  [10] ;  [4] ;  [4] ;  [11] ;  [6] ;  [6] ;  [9] ;  [6] ;  [8] more »;  [5] ;  [12] ;  [9] ;  [6] ;  [13] ;  [8] ;  [6] ;  [14] ;  [4] ;  [9] ;  [7] ;  [15] ;  [4] ;  [11] ;  [10] ;  [10] ;  [16] ;  [4] ;  [17] ;  [6] ;  [9] ;  [18] ;  [19] ;  [8] ;  [8] ;  [20] ;  [4] ;  [21] ;  [22] ;  [8] ;  [8] ;  [23] ;  [24] ;  [6] ;  [4] ;  [25] « less
  1. Univ. of Pennsylvania, Philadelphia, PA (United States); West Chester Univ. of Pennsylvania, West Chester, PA (United States)
  2. Cardif Univ.(United Kingdom)
  3. Univ. of Pittsburgh, PA (United States)
  4. Univ. of Pennsylvania, Philadelphia, PA (United States)
  5. Univ. of British Columbia, Vancouver, BC (Canada)
  6. NIST Quantum Sensors Group, Boulder, CO (United States)
  7. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  8. Princeton Univ., NJ (United States). Joseph Henry Lab. of Physics
  9. Cornell Univ., Ithaca, NY (United States)
  10. Univ. of Michigan, Ann Arbor, MI (United States)
  11. Pontificia Univ. Catolica de Chile, Santiago (Chile)
  12. Pennsylvania State Univ., University Park, PA (United States)
  13. Univ. of British Columbia, Vancouver, BC (Canada); Pontificia Univ. Gregoriana, Rome (Italy)
  14. SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., CA (United States)
  15. UPMC Univ. Paris (France)
  16. Univ. of Oxford (United Kingdom)
  17. Univ. of Toronto, ON (Canada)
  18. Sociedad Radiosky Asesoras de Ingeniería Limitada Lincoyan, Concepcion (Chile)
  19. Univ. of Toronto, ON (Canada). Canadian Inst. for Theoretical Astrophysics
  20. Princeton Univ., NJ (United States). Joseph Henry Lab. of Physics; Sociedad Radiosky Asesoras de Ingeniería Limitada Lincoyan, Concepcion (Chile)
  21. Stony Brook Univ., NY (United States)
  22. Univ. of KwaZulu-Natal, Durban (South Africa). Astrophysics & Cosmology Research Unit
  23. Cardiff Univ. (United Kingdom)
  24. Sociedad Radiosky Asesoras de Ingenieri­a Limitada Lincoyan, Concepcion (Chile)
  25. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
Publication Date:
Grant/Contract Number:
AC02-76SF00515
Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal. Supplement Series (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal. Supplement Series (Online); Journal Volume: 227; Journal Issue: 2; Journal ID: ISSN 1538-4365
Publisher:
American Astronomical Society/IOP
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS
OSTI Identifier:
1361145