The South Pole Telescope Shirokoff Line Intensity Mapper (SPT-SLIM) is a millimeter-wavelength line-intensity mapping experiment, which was deployed on the South Pole Telescope (SPT) during the 2024-2025 Austral summer season. This pathfinder experiment serves to demonstrate the on-sky operation of multi-pixel on-chip spectrometer technology. We report on the cryogenic performance of the SPT-SLIM receiver for the first year of commissioning observations. The SPT-SLIM receiver utilizes an Adiabatic Demagnetization Refrigerator (ADR) for cooling the focal plane of superconducting filterbank spectrometers to a temperature of 150 mK. We demonstrate stable thermal performance of the focal plane module during observations consistent with thermal modeling, enabling a cryogenic operating efficiency above 80%. We also report on the receiver control system design utilizing the Observatory Control System (OCS) platform for automated cryogenic operation on the SPT.
@article{arxiv.2510.14219,
title = {Design and Performance of the SPT-SLIM Receiver Cryostat},
author = {M. R. Young and M. Adamic and A. J. Anderson and P. S. Barry and B. A. Benson and C. S. Benson and E. Brooks and J. E. Carlstrom and T. Cecil and C. L. Chang and K. R. Dibert and M. Dobbs and K. Fichman and M. Hollister and K. S. Karkare and G. K. Keating and A. M. Lapuente and M. Lisovenko and D. P. Marrone and D. Mitchell and J. Montgomery and T. Natoli and Z. Pan and A. Rahlin and G. Robson and M. Rouble and G. Smecher and V. Yefremenko and C. Yu and J. A. Zebrowski and C. Zhang},
journal= {arXiv preprint arXiv:2510.14219},
year = {2025}
}
Comments
6 pages, 6 figures, 1 table. Submitted to IEEE Transactions on Applied Superconductivity (Proceedings of the 21st International Conference on Low Temperature Detectors)