19 July 2016 Readout of two-kilopixel transition-edge sensor arrays for Advanced ACTPol
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Abstract
Advanced ACTPol is an instrument upgrade for the six-meter Atacama Cosmology Telescope (ACT) designed to measure the cosmic microwave background (CMB) temperature and polarization with arcminute-scale angular resolution. To achieve its science goals, Advanced ACTPol utilizes a larger readout multiplexing factor than any previous CMB experiment to measure detector arrays with approximately two thousand transition-edge sensor (TES) bolometers in each 150 mm detector wafer. We present the implementation and testing of the Advanced ACTPol time-division multiplexing readout architecture with a 64-row multiplexing factor. This includes testing of individual multichroic detector pixels and superconducting quantum interference device (SQUID) multiplexing chips as well as testing and optimizing of the integrated readout electronics. In particular, we describe the new automated multiplexing SQUID tuning procedure developed to select and optimize the thousands of SQUID parameters required to readout each Advanced ACTPol array. The multichroic detector pixels in each array use separate channels for each polarization and each of the two frequencies, such that four TESes must be read out per pixel. Challenges addressed include doubling the number of detectors per multiplexed readout channel compared to ACTPol and optimizing the Nyquist inductance to minimize detector and SQUID noise aliasing.
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Shawn W. Henderson, Shawn W. Henderson, Jason R. Stevens, Jason R. Stevens, Mandana Amiri, Mandana Amiri, Jason Austermann, Jason Austermann, James A. Beall, James A. Beall, Saptarshi Chaudhuri, Saptarshi Chaudhuri, Hsiao-Mei Cho, Hsiao-Mei Cho, Steve K. Choi, Steve K. Choi, Nicholas F. Cothard, Nicholas F. Cothard, Kevin T. Crowley, Kevin T. Crowley, Shannon M. Duff, Shannon M. Duff, Colin P. Fitzgerald, Colin P. Fitzgerald, Patricio A. Gallardo, Patricio A. Gallardo, Mark Halpern, Mark Halpern, Matthew Hasselfield, Matthew Hasselfield, Gene Hilton, Gene Hilton, Shuay-Pwu Patty Ho, Shuay-Pwu Patty Ho, Johannes Hubmayr, Johannes Hubmayr, Kent D. Irwin, Kent D. Irwin, Brian J. Koopman, Brian J. Koopman, Dale Li, Dale Li, Yaqiong Li, Yaqiong Li, Jeff McMahon, Jeff McMahon, Federico Nati, Federico Nati, Michael Niemack, Michael Niemack, Carl D. Reintsema, Carl D. Reintsema, Maria Salatino, Maria Salatino, Alessandro Schillaci, Alessandro Schillaci, Benjamin L. Schmitt, Benjamin L. Schmitt, Sara M. Simon, Sara M. Simon, Suzanne T. Staggs, Suzanne T. Staggs, Eve M. Vavagiakis, Eve M. Vavagiakis, Jonathan T. Ward, Jonathan T. Ward, "Readout of two-kilopixel transition-edge sensor arrays for Advanced ACTPol", Proc. SPIE 9914, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VIII, 99141G (19 July 2016); doi: 10.1117/12.2233895; https://doi.org/10.1117/12.2233895
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