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Design of the SPT-SLIM focal plane: A spectroscopic imaging array for the South Pole Telescope

Barry, P. S., Anderson, A., Benson, B., Carlstrom, J. E., Cecil, T., Chang, C., Dobbs, M., Hollister, M., Karkare, K. S., Keating, G. K., Marrone, D., McMahon, J., Montgomery, J., Pan, Z., Robson, G., Rouble, M., Shirokoff, E. and Smecher, G. 2022. Design of the SPT-SLIM focal plane: A spectroscopic imaging array for the South Pole Telescope. Journal of Low Temperature Physics 209 (5-6) , pp. 879-888. 10.1007/s10909-022-02843-4

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The Summertime Line Intensity Mapper (SLIM) is a mm-wave line-intensity mapping (mm-LIM) experiment for the South Pole Telescope (SPT). The goal of SPT-SLIM is to serve as a technical and scientific pathfinder for the demonstration of the suitability and in-field performance of multi-pixel superconducting filterbank spectrometers for future mm-LIM experiments. Scheduled to deploy in the 2023-24 austral summer, the SPT-SLIM focal plane will include 18 dual-polarisation pixels, each coupled to an R=λ/Δλ=300 thin-film microstrip filterbank spectrometer that spans the 2 mm atmospheric window (120–180 GHz). Each individual spectral channel feeds a microstrip-coupled lumped-element kinetic inductance detector, which provides the highly multiplexed readout for the 10k detectors needed for SPT-SLIM. Here, we present an overview of the preliminary design of key aspects of the SPT-SLIM focal plane array, a description of the detector architecture and predicted performance, and initial test results that will be used to inform the final design of the SPT-SLIM spectrometer array.

Item Type: Article
Date Type: Published Online
Status: Published
Schools: Physics and Astronomy
Additional Information: License information from Publisher: LICENSE 1: URL:, Type: open-access
Publisher: Springer
ISSN: 0022-2291
Date of First Compliant Deposit: 1 December 2022
Date of Acceptance: 12 August 2022
Last Modified: 11 Jan 2023 17:09

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