Characterization of the Mid-Frequency Arrays for Advanced ACTPol

S. K. Choi, J. Austermann, J. A. Beall, K. T. Crowley, R. Datta, S. M. Duff, P. A. Gallardo, S. P. Ho, J. Hubmayr, B. J. Koopman, Y. Li, F. Nati, M. D. Niemack, L. A. Page, M. Salatino, S. M. Simon, S. T. Staggs, J. Stevens, J. Ullom, E. J. Wollack

Research output: Contribution to journalArticlepeer-review

30 Scopus citations


The Advanced ACTPol upgrade on the Atacama Cosmology Telescope aims to improve the measurement of the cosmic microwave background anisotropies and polarization, using four new dichroic detector arrays fabricated on 150-mm silicon wafers. These bolometric cameras use AlMn transition-edge sensors, coupled to feedhorns with orthomode transducers for polarization sensitivity. The first deployed camera is sensitive to both 150 and 230 GHz. Here, we present the laboratory characterization of the thermal parameters and optical efficiencies for the two newest fielded arrays, each sensitive to both 90 and 150 GHz. We provide assessments of the parameter uniformity across each array with evaluation of systematic uncertainties. Lastly, we show the arrays’ initial performance in the field.

Original languageEnglish (US)
Pages (from-to)267-275
Number of pages9
JournalJournal of Low Temperature Physics
Issue number3-4
StatePublished - Nov 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 efficiency
  • Transition-edge sensor


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