Optical efficiency and R(T,I) measurements of ACTPol TESes using time domain multiplexing electronics

C. G. Pappas, J. Beall, J. Brevick, H. M. Cho, M. J. Devlin, A. Fox, E. A. Grace, G. C. Hilton, J. Hubmayr, K. D. Irwin, J. Klein, D. Li, M. Lungu, L. B. Newburgh, J. P. Nibarger, M. D. Niemack, J. J. McMahon, L. A. Page, B. L. Schmitt, S. T. StaggsJ. Van Lanen, E. J. Wollack

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


We present new data on feedhorn-coupled transition-edge sensor devices fabricated for the second-generation receiver (ACTPol) for the Atacama cosmology telescope (ACT). First, we describe optical efficiency measurements of the latest ACTPol detector wafer, which has a 86±15 % average optical efficiency. Next, we discuss measurements of the TES resistance as a function of temperature and bias current (R (T, I)) using the ACTPol time-domain multiplexing electronics. Qualitative agreement between R (T, I) data at low bias current and the two-fluid model prediction is shown. Using the two-fluid model and low bias current R (T, I) data, α and β at our operating bias current are calculated.

Original languageEnglish (US)
Pages (from-to)749-754
Number of pages6
JournalJournal of Low Temperature Physics
Issue number5-6
StatePublished - Sep 2014

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • General Materials Science
  • Condensed Matter Physics


  • ACTPol
  • Atacama cosmology telescope
  • Cosmic microwave background (CMB)
  • Polarization
  • Transition edge sensor (TES)


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