Fabrication Development for SPT-SLIM, a Superconducting Spectrometer for Line Intensity Mapping ...

• Main Authors: Cecil, T., Albert, C., Anderson, A. J., Barry, P. S., Benson, B., Cotter, C., Chang, C., Dobbs, M., Dibert, K., Gualtieri, R., Karkare, K. S., Lisovenko, M., Marrone, D. P., Montgomery, J., Pan, Z., Robson, G., Rouble, M., Shirokoff, E., Smecher, G., Wang, G., Yefremenko, V.
• Format: Text
• Language: unknown
• Published: arXiv 2023
• Subjects: Instrumentation and Methods for Astrophysics astro-ph.IM; Instrumentation and Detectors physics.ins-det; FOS Physical sciences; South Pole; South pole
• Online Access: https://dx.doi.org/10.48550/arxiv.2304.00973; https://arxiv.org/abs/2304.00973

Line Intensity Mapping (LIM) is a new observational technique that uses low-resolution observations of line emission to efficiently trace the large-scale structure of the Universe out to high redshift. Common mm/sub-mm emission lines are accessible from ground-based observatories, and the requirements on the detectors for LIM at mm-wavelengths are well matched to the capabilities of large-format arrays of superconducting sensors. We describe the development of an R = 300 on-chip superconducting filter-bank spectrometer covering the 120--180 GHz band optimized for future mm-LIM experiments, focusing on SPT-SLIM, a pathfinder LIM instrument for the South Pole Telescope. Radiation is coupled from the telescope optical system to the spectrometer chip via an array of feedhorn-coupled orthomode transducers. Superconducting microstrip transmission lines then carry the signal to an array of channelizing half-wavelength resonators, and the output of each spectral channel is sensed by a lumped element kinetic ... : 7 pages, 7 figures, presented at 2022 Applied Superconductivity Conference ...