Readout of two-kilopixel transition-edge sensor arrays for Advanced ACTPol

Shawn W. Henderson, Jason R. Stevens, Mandana Amiri, Jason Austermann, James A. Beall, Saptarshi Chaudhuri, Hsiao Mei Cho, Steve K. Choi, Nicholas F. Cothard, Kevin T. Crowley, Shannon M. Duff, Colin P. Fitzgerald, Patricio A. Gallardo, Mark Halpern, Matthew Hasselfield, Gene Hilton, Shuay Pwu Patty Ho, Johannes Hubmayr, Kent D. Irwin, Brian J. KoopmanDale Li, Yaqiong Li, Jeff McMahon, Federico Nati, Michael Niemack, Carl D. Reintsema, Maria Salatino, Alessandro Schillaci, Benjamin L. Schmitt, Sara M. Simon, Suzanne T. Staggs, Eve M. Vavagiakis, Jonathan T. Ward

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

28 Scopus citations


Advanced ACTPol is an instrument upgrade for the six-meter Atacama Cosmology Telescope (ACT) designed to measure the cosmic microwave background (CMB) temperature and polarization with arcminute-scale angular resolution. To achieve its science goals, Advanced ACTPol utilizes a larger readout multiplexing factor than any previous CMB experiment to measure detector arrays with approximately two thousand transition-edge sensor (TES) bolometers in each 150 mm detector wafer. We present the implementation and testing of the Advanced ACTPol time-division multiplexing readout architecture with a 64-row multiplexing factor. This includes testing of individual multichroic detector pixels and superconducting quantum interference device (SQUID) multiplexing chips as well as testing and optimizing of the integrated readout electronics. In particular, we describe the new automated multiplexing SQUID tuning procedure developed to select and optimize the thousands of SQUID parameters required to readout each Advanced ACTPol array. The multichroic detector pixels in each array use separate channels for each polarization and each of the two frequencies, such that four TESes must be read out per pixel. Challenges addressed include doubling the number of detectors per multiplexed readout channel compared to ACTPol and optimizing the Nyquist inductance to minimize detector and SQUID noise aliasing.

Original languageEnglish (US)
Title of host publicationMillimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VIII
EditorsJonas Zmuidzinas, Wayne S. Holland
ISBN (Electronic)9781510602076
StatePublished - 2016
EventMillimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VIII - Edinburgh, United Kingdom
Duration: Jun 28 2016Jul 1 2016

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 VIII
Country/TerritoryUnited Kingdom

All Science Journal Classification (ASJC) codes

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


  • Cosmic Microwave Background
  • Multiplexing Factor
  • Time-division SQUID Multiplexing
  • Transition-Edge Sensors


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