Characterization of AlMn TES impedance, noise, and optical efficiency in the first 150 mm multichroic array for Advanced ACTPol

Kevin T. Crowley; Steve K. Choi; Jeffrey Kuan; Jason A. Austermann; James A. Beall; Rahul Datta; Shannon M. Duff; Patricio A. Gallardo; Matthew Hasselfield; Shawn W. Henderson; Shuay-Pwu P. Ho; Brian J. Koopman; Michael D. Niemack; Maria Salatino; Sara M. Simon; Suzanne T. Staggs; Edward J. Wollack

doi:10.1117/12.2231999

16 September 2016 Characterization of AlMn TES impedance, noise, and optical efficiency in the first 150 mm multichroic array for Advanced ACTPol

Kevin T. Crowley, Steve K. Choi, Jeffrey Kuan, Jason A. Austermann, James A. Beall, Rahul Datta, Shannon M. Duff, Patricio A. Gallardo, Matthew Hasselfield, Shawn W. Henderson, Shuay-Pwu P. Ho, Brian J. Koopman, Michael D. Niemack, Maria Salatino, Sara M. Simon, Suzanne T. Staggs, Edward J. Wollack

Author Affiliations +

Proceedings Volume 9914, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VIII; 991431 (2016) https://doi.org/10.1117/12.2231999
Event: SPIE Astronomical Telescopes + Instrumentation, 2016, Edinburgh, United Kingdom

Abstract

The Advanced ACTPol (AdvACT) upgrade to the Atacama Cosmology Telescope features large arrays of mul- tichroic pixels consisting of two orthogonal-polarization pairs of superconducting bolometers at two observing frequency bands. We present measurements of the detector properties and noise data in a subset of a fielded multichroic array of AlMn transition-edge sensor (TES) detectors. In this array, the distribution of critical temperature T_c across detectors appears uniform at the percent level. The measured noise-equivalent power (NEP) distributions over ∼1200 detectors are consistent with expectations. We find median NEPs of 4.0×10^-17 √Hz for low-band detectors and 6.2x10^-17√Hz for high-band detectors under covered-window telescope test conditions with optical loading comparable to observing with precipitable water vapor ∼ 0.5 mm. Lastly, we show the estimated detector optical efficiency, and demonstrate the ability to perform optical characterization over hundreds of detectors at once using a cryogenic blackbody source.

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Kevin T. Crowley, Steve K. Choi, Jeffrey Kuan, Jason A. Austermann, James A. Beall, Rahul Datta, Shannon M. Duff, Patricio A. Gallardo, Matthew Hasselfield, Shawn W. Henderson, Shuay-Pwu P. Ho, Brian J. Koopman, Michael D. Niemack, Maria Salatino, Sara M. Simon, Suzanne T. Staggs, and Edward J. Wollack "Characterization of AlMn TES impedance, noise, and optical efficiency in the first 150 mm multichroic array for Advanced ACTPol", Proc. SPIE 9914, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VIII, 991431 (16 September 2016); https://doi.org/10.1117/12.2231999

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