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Proceedings Paper

Characterization of AlMn TES impedance, noise, and optical efficiency in the first 150 mm multichroic array for Advanced ACTPol
Author(s): 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
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Paper 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 Tc 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.

Paper Details

Date Published: 16 September 2016
PDF: 12 pages
Proc. SPIE 9914, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VIII, 991431 (16 September 2016); doi: 10.1117/12.2231999
Show Author Affiliations
Kevin T. Crowley, Princeton Univ. (United States)
Steve K. Choi, Princeton Univ. (United States)
Jeffrey Kuan, Princeton Univ. (United States)
Jason A. Austermann, NIST Quantum Devices Group (United States)
James A. Beall, NIST Quantum Devices Group (United States)
Rahul Datta, Univ. of Michigan (United States)
Shannon M. Duff, NIST Quantum Devices Group (United States)
Patricio A. Gallardo, Cornell Univ. (United States)
Matthew Hasselfield, The Pennsylvania State Univ. (Canada)
Shawn W. Henderson, Cornell Univ. (United States)
Shuay-Pwu P. Ho, Princeton Univ. (United States)
Brian J. Koopman, Cornell Univ. (United States)
Michael D. Niemack, Cornell Univ. (United States)
Maria Salatino, Princeton Univ. (United States)
Sara M. Simon, Univ. of Michigan (United States)
Suzanne T. Staggs, Princeton Univ. (United States)
Edward J. Wollack, NASA Goddard Space Flight Ctr. (United States)

Published in SPIE Proceedings Vol. 9914:
Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VIII
Wayne S. Holland; Jonas Zmuidzinas, Editor(s)

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