The Advanced ACTPol 27/39 GHz Array

S. M. Simon, J. A. Beall, N. F. Cothard, S. M. Duff, P. A. Gallardo, S. P. Ho, J. Hubmayr, B. J. Koopman, J. J. McMahon, F. Nati, M. D. Niemack, S. T. Staggs, E. M. Vavagiakis, E. J. Wollack

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


Advanced ACTPol (AdvACT) will observe the temperature and polarization of the cosmic microwave background (CMB) at multiple frequencies and high resolution to place improved constraints on inflation, dark matter, and dark energy. Foregrounds from synchrotron and dust radiation are a source of contamination that must be characterized and removed across a wide range of frequencies. AdvACT will thus observe at five frequency bands from 27 to 230 GHz. We discuss the design of the pixels and feedhorns for the 27/39 GHz multichroic array for AdvACT, which will target the synchrotron radiation that dominates at these frequencies. To gain 35% in mapping speed in the 39 GHz band where the foreground signals are faintest, the pixel number was increased through reducing the pixel diameter to 1.08 λ at the lowest frequency, which represents a 22% decrease in size compared to our previously most tightly packed pixels.

Original languageEnglish (US)
Pages (from-to)1041-1047
Number of pages7
JournalJournal of Low Temperature Physics
Issue number5-6
StatePublished - Dec 1 2018

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • General Materials Science
  • Condensed Matter Physics


  • Advanced ACTPol
  • Atacama Cosmology Telescope
  • Cosmic microwave background
  • Detector design
  • Foregrounds
  • Multichroic pixel
  • Polarization-sensitive detector
  • Synchrotron
  • Transition-edge sensor


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