Abstract
We have demonstrated in the laboratory multiple, fully functional, kilopixel, bolometer arrays for the upgraded instrument, the High-resolution airborne wideband camera plus (HAWC+), for the stratospheric observatory for infrared astronomy (SOFIA). Each kilopixel array consists of three individual components assembled into a single working unit: (1) a filled, Transition Edge Sensor (TES) bolometer array, (2) an infrared, back-termination, and (3) an integrated, two-dimensional superconducting quantum interference device (SQUID) multiplexer readout. Kilopixel TES arrays are directly indium-bump-bonded to a 32 \(\times \) 40 SQUID multiplexer (MUX) circuit. In order to provide a fully superconducting pathway from the TES to the SQUID readout, numerous superconductor-to-superconductor interfaces must be made. This paper focuses on the fabrication techniques needed to create the superconducting path from the TES, out of the detector membrane, through the wafer, and to the SQUID readout.
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Acknowledgments
This work was supported through a series of NASA awards, including the High resolution Airborne Wideband Camera Plus (HAWC+/SOFIA, Dr. Darren Dowell, Principal Investigator) and the Primordial Inflation Polarization Explorer (PIPER, Dr. Alan Kogut, Principal Investigator). The authors also wish to thank the work of Dr. James A. Chervenak, NASA Goddard Space Flight Center, Detector Systems Branch, for cryogenic test support.
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Jhabvala, C.A., Benford, D.J., Brekosky, R.P. et al. Superconducting Pathways Through Kilopixel Backshort–Under–Grid Arrays. J Low Temp Phys 184, 615–620 (2016). https://doi.org/10.1007/s10909-016-1487-y
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DOI: https://doi.org/10.1007/s10909-016-1487-y