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- W2804856965 abstract "The third-generation upgrade to the receiver on the South Pole Telescope, SPT-3G, was installed at the South Pole during the 2016–2017 austral summer to measure the polarization of the cosmic microwave background. Increasing the number of detectors by a factor of 10 to $$sim 16,000$$ required the multiplexing factor to increase to 68 and the bandwidth of the frequency-division readout electronics to span 1.6–5.2 MHz. This increase necessitates low-thermal conductance, low-inductance cryogenic wiring. Our cold readout system consists of planar thin-film aluminum inductive–capacitive resonators, wired in series with the detectors, summed together, and connected to 4K SQUIDs by $$10-upmu hbox {m}$$ -thick niobium–titanium (NbTi) broadside-coupled striplines. Here, we present an overview of the cold readout electronics for SPT-3G, including assembly details and characterization of electrical and thermal properties of the system. We report, for the NbTi striplines, values of $$R le 10^{-4} Omega $$ , $$L = 21 pm 1~hbox {nH}$$ , and $$C = 1.47pm .02~hbox {nF}$$ . Additionally, the striplines’ thermal conductivity is described by $$kA = 6.0pm 0.3 T^{0.92 pm 0.04}~upmu hbox {W}~hbox {mm}~hbox {K}^{-1}$$ . Finally, we provide projections for cross talk induced by parasitic impedances from the stripline and find that the median value of percentage cross talk from leakage current is 0.22 and $$0.09%$$ from wiring impedance." @default.
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- W2804856965 date "2018-05-24" @default.
- W2804856965 modified "2023-09-23" @default.
- W2804856965 title "Design and Assembly of SPT-3G Cold Readout Hardware" @default.
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- W2804856965 doi "https://doi.org/10.1007/s10909-018-1965-5" @default.
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