Performance of the advanced ACTPol low frequency array

Yaqiong Li, Jason E. Austermann, James A. Beall, Sarah Marie Bruno, Steve K. Choi, Nicholas F. Cothard, Kevin T. Crowley, Shannon M. Duff, Patricio A. Gallardo, Shawn W. Henderson, Shuay Pwu Patty Ho, Johannes Hubmayr, Brian J. Koopman, Jeff J. McMahon, Michael D. Niemack, Maria Salatino, Sara M. Simon, Suzanne T. Staggs, Jason R. Stevens, Joel N. UllomJonathan Ward, Edward J. Wollack

Research output: Chapter in Book/Report/Conference proceedingConference contribution

9 Scopus citations


The Advanced Atacama Cosmology Telescope Polarimeter (AdvACT) is an upgraded instrument for the Atacama Cosmology Telescope, which uses transition-edge sensor (TES) detector arrays to measure cosmic microwave background (CMB) polarization anisotropies in multiple frequency bands. We review the integration and characterization of the final polarimeter array, which is the low frequency (LF) array, consisting of 292 TES bolometers observing in two bands centered at 27 GHz and 39 GHz. This array is sensitive to synchrotron radiation from our galaxy as well as to the CMB, and complements the AdvACT arrays operating at 90, 150 and 230 GHz to provide robust detection and removal of foreground contamination. We present detector parameters for the LF array measured in the lab, including saturation powers, critical temperatures, thermal conductivities, time constants and optical efficiencies, and their uniformity across the entire wafer.

Original languageEnglish (US)
Title of host publicationMillimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy IX
EditorsJonas Zmuidzinas, Jian-Rong Gao
ISBN (Print)9781510619692
StatePublished - 2018
EventMillimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy IX 2018 - Austin, United States
Duration: Jun 12 2018Jun 15 2018

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


OtherMillimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy IX 2018
Country/TerritoryUnited States

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


  • AdvACT
  • CE7
  • CMB
  • detector array integration
  • low frequency TES
  • saturation power
  • time constant


Dive into the research topics of 'Performance of the advanced ACTPol low frequency array'. Together they form a unique fingerprint.

Cite this