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High-Density Superconducting Cables for Advanced ACTPolAdvanced ACTPol (AdvACT) is an upcoming Atacama Cosmology Telescope (ACT) receiver upgrade, scheduled to deploy in 2016, that will allow measure- ment of the cosmic microwave background polarization and temperature to the highest precision yet with ACT. The AdvACT increase in sensitivity is partly provided by an increase in the number of transition-edge sensors (TESes) per array by up to a factor of two over the current ACTPol receiver detector arrays. The high-density AdvACT TES arrays require 70 μ m pitch superconducting flexible cables (flex) to connect the detec- tor wafer to the first-stage readout electronics. Here, we present the flex fabrication process and test results. For the flex wiring layer, we use a 400-nm-thick sputtered alu- minum film. In the center of the cable, the wiring is supported by a polyimide substrate, which smoothly transitions to a bare (uncoated with polyimide) silicon substrate at the ends of the cable for a robust wedge wire-bonding interface. Tests on the first batch of flex made for the first AdvACT array show that the flex will meet the requirements for AdvACT, with a superconducting critical current above 1 mA at 500 mK, resilience to mechanical and cryogenic stress, and a room temperature yield of 97%.
Document ID
20160013307
Document Type
Reprint (Version printed in journal)
Authors
Pappas, C. G. (Princeton Univ. Princeton, NJ, United States)
Austermann, J. (National Inst. of Standards and Technology Boulder, CO, United States)
Beall, J. A. (National Inst. of Standards and Technology Boulder, CO, United States)
Duff, S. M. (National Inst. of Standards and Technology Boulder, CO, United States)
Gallardo, P. A. (Cornell Univ. Ithaca, NY, United States)
Grace, E. (Princeton Univ. Princeton, NJ, United States)
Henderson, S. W. (Cornell Univ. Ithaca, NY, United States)
Ho, S. P. (Princeton Univ. Princeton, NJ, United States)
Koopman, B. J. (Cornell Univ. Ithaca, NY, United States)
Li, D. (Stanford Linear Accelerator Center Menlo Park, CA, United States)
McMahon, J. (Michigan Univ. Ann Arbor, MI, United States)
Nati, F. (Pennsylvania Univ. Philadelphia, PA, United States)
Niemack, M. D. (Cornell Univ. Ithaca, NY, United States)
Niraula, P. (Princeton Univ. Princeton, NJ, United States)
Salatino, M. (Princeton Univ. Princeton, NJ, United States)
Schillaci, A. (Princeton Univ. Princeton, NJ, United States)
Schmitt, B. L. (Pennsylvania Univ. Philadelphia, PA, United States)
Simon, S. M. (Princeton Univ. Princeton, NJ, United States)
Staggs, S. T. (Princeton Univ. Princeton, NJ, United States)
Vavagiakis, E. M. (Cornell Univ. Ithaca, NY, United States)
Ward, J. T. (Pennsylvania Univ. Philadelphia, PA, United States)
Wollack, E. J. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Date Acquired
November 8, 2016
Publication Date
January 11, 2016
Publication Information
Publication: Journal of Low Temperature Physics
Volume: 184
Issue: 1
Subject Category
Astrophysics
Report/Patent Number
GSFC-E-DAA-TN32093
Funding Number(s)
CONTRACT_GRANT: NSF PHY-1214379
CONTRACT_GRANT: NSF AST-0965625
CONTRACT_GRANT: NSF AST-1440226
Distribution Limits
Public
Copyright
Other
Keywords
transition-edge sensors (TESes)
Advanced ACTPol (AdvACT)
sputtered aluminum film