SPT-SLIM: A Line Intensity Mapping Pathfinder for the South Pole Telescope

Authors:
  • KKK. S. Karkare
    K. S. Karkare
  • AAA. J. Anderson
    A. J. Anderson
  • PBP. S. Barry
    P. S. Barry
  • BBB. A. Benson
    B. A. Benson
  • JCJ. E. Carlstrom
    J. E. Carlstrom
  • TCT. Cecil
    T. Cecil
  • CCC. L. Chang
    C. L. Chang
  • MDM. A. Dobbs
    M. A. Dobbs
  • MHM. Hollister
    M. Hollister
  • GKG. K. Keating
    G. K. Keating
  • DMD. P. Marrone
    D. P. Marrone
  • JMJ. McMahon
    J. McMahon
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Abstract
The South Pole Telescope Summertime Line Intensity Mapper (SPT-SLIM) is a pathfinder experiment that will demonstrate the use of on-chip filter-bank spectrometers for mm-wave line intensity mapping (LIM). The SPT-SLIM focal plane consists of 18 dual-polarization R=300 filter-bank spectrometers covering 120-180 GHz, coupled to aluminum kinetic inductance detectors. A compact cryostat holds the detectors at 100 mK and performs observations without removing the SPT-3G receiver. SPT-SLIM will be deployed to the 10-m South Pole Telescope for observations during the 2023-24 austral summer. We discuss the overall instrument design, expected detector performance and sensitivity to the LIM signal from CO at 0.5 < z < 2. The technology and observational techniques demonstrated by SPT-SLIM will enable next-generation LIM experiments that constrain cosmology beyond the redshift reach of galaxy surveys.
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