In Situ Performance of the Low Frequency Array for Advanced ACTPol

Yaqiong Li, Jason E. Austermann, James A. Beall, Sarah Marie Bruno, Steve K. Choi, Nicholas F. Cothard, Kevin T. Crowley, Shannon M. Duff, Shuay Pwu Patty Ho, Joseph E. Golec, Gene C. Hilton, Matthew Hasselfield, Johannes Hubmayr, Brian J. Koopman, Marius Lungu, Jeff McMahon, Michael D. Niemack, Lyman A. Page, Maria Salatino, Sara M. SimonSuzanne T. Staggs, Jason R. Stevens, Joel N. Ullom, Eve M. Vavagiakis, Yuhan Wang, Edward J. Wollack, Zhilei Xu

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


The AdvancedAtacama Cosmology Telescope Polarimeter (AdvACT) [1] is an upgrade for the Atacama Cosmology Telescope using Transition Edge Sensor (TES) detector arrays to measure cosmic microwave background (CMB) temperature and polarization anisotropies in multiple frequencies. The low frequency (LF) array was deployed early 2020. It consists of 292 TES bolometers observing in two bands centered at 27 GHz and 39 GHz. At these frequencies, it 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. We present the initial LF array on-site characterization, including the time constant, optical efficiency and array sensitivity.

Original languageEnglish (US)
Article number9369015
JournalIEEE Transactions on Applied Superconductivity
Issue number5
StatePublished - Aug 2021

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


  • Superconducting detectors
  • transition edge sensor


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