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arxiv: 1907.11976 · v1 · pith:FPG47ATBnew · submitted 2019-07-27 · 🌌 astro-ph.IM · physics.ins-det

Performance of Al-Mn Transition-Edge Sensor Bolometers in SPT-3G

classification 🌌 astro-ph.IM physics.ins-det
keywords al-mnspt-3gbolometersdetectormeasurementsperformancereceiversensor
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SPT-3G is a polarization-sensitive receiver, installed on the South Pole Telescope, that measures the anisotropy of the cosmic microwave background (CMB) from degree to arcminute scales. The receiver consists of ten 150~mm-diameter detector wafers, containing a total of 16,000 transition-edge sensor (TES) bolometers observing at 95, 150, and 220 GHz. During the 2018-2019 austral summer, one of these detector wafers was replaced by a new wafer fabricated with Al-Mn TESs instead of the Ti/Au design originally deployed for SPT-3G. We present the results of in-lab characterization and on-sky performance of this Al-Mn wafer, including electrical and thermal properties, optical efficiency measurements, and noise-equivalent temperature. In addition, we discuss and account for several calibration-related systematic errors that affect measurements made using frequency-domain multiplexing readout electronics.

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