Advanced ACTPol TES Device Parameters and Noise Performance in Fielded Arrays

Kevin T. Crowley, Jason E. Austermann, Steve K. Choi, Shannon M. Duff, Patricio A. Gallardo, Shuay Pwu Patty Ho, Johannes Hubmayr, Brian J. Koopman, Federico Nati, Michael D. Niemack, Maria Salatino, Sara M. Simon, Suzanne T. Staggs, Jason R. Stevens, Joel N. Ullom, Eve M. Vavagiakis, Edward J. Wollack

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


The Advanced ACTPol (AdvACT) upgrade to the Atacama Cosmology Telescope (ACT) features arrays of aluminum manganese transition-edge sensors (TESes) optimized for ground-based observations of the cosmic microwave background (CMB). Array testing shows highly responsive detectors with anticipated in-band noise performance under optical loading. We report on TES parameters measured with impedance data taken on a subset of TESes. We then compare modeled noise spectral densities to measurements. We find excess noise at frequencies around 100 Hz, nearly outside of the signal band of CMB measurements. In addition, we describe full-array noise measurements in the laboratory and in the field for two new AdvACT mid-frequency arrays, sensitive at bands centered on 90 and 150 GHz, and data for the high-frequency array (150/230 GHz) as deployed.

Original languageEnglish (US)
Pages (from-to)328-336
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


  • Cosmic microwave background
  • Detector modeling
  • Noise performance
  • TES parameters
  • Transition-edge sensor


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