SPT-3G+: a cosmic microwave background experiment for the South Pole Telescope

Natoli, T., Ahmed, Z., Athreya, H., Austermann, J. E., Bae, K., Bapat, A., Barron, D. R., Barry, P. S., Bender, A. N., Benson, B. A., Bleem, L. E., Carlstrom, J. E., Cecil, T. W., Chang, C. L., Cisneros, S., Coerver, A., Cornelison, J., Crawford, T. M., Datta, R., Dibert, K. R., Dominguez, W., Duff, S. M., Fichman, K., Fillipini, J. P., Gades, L., Gallardo, P. A., Galli, S., Halverson, N. W., Hao, Q., Henderson, S., Herbst, R., Holzapfel, W. L., Hryciuk, A., Hubmayr, J., Jones, D., Kabra, V., Karkare, K. S., King, C., Koc, M. A., Kofman, A. M., Lew, R. A., Link, M. A., Lucas, T. J., Mangu, A., Martsen, E. S., McMahon, J. J., Montgomery, J., Nagy, J. M., Nguyen, H., Novosad, V., Padin, S., Pinsonneault-Marotte, T., Raghunathan, S., Rahlin, A. S., Reichardt, C. L., Ruckman, L., Ruhl, J. E., Sarwar, M. S., Simon, S., Singh, R., Sobrin, J. A., Stark, A. A., Taylor, Q., Tucker, C. ORCID: https://orcid.org/0000-0002-1851-3918, Ullom, J., Lanen, J. Van, Viera, J. D., Vieregg, A. G., Vissers, M. R., Wang, G., Wu, W. K. L., Yefremenko, V., Yilmaz, E., Yu, C. and Zivick, J. 2026. SPT-3G+: a cosmic microwave background experiment for the South Pole Telescope. Presented at: SPIE Astronomical Telescopes + Instrumentation, 2026, Copenhagen, Denmark, 5-10 July 2026. Proceedings Volume 14156: Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XIII. Proceedings of SPIE. , vol.14156 Society of Photo-optical Instrumentation Engineers, 10.1117/12.3103020

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Abstract

SPT-3G+ is the next survey receiver planned to be installed in early 2029 on the 10-meter South Pole Telescope (SPT). This new receiver will feature 6,020 polarization-sensitive dichroic pixels with transition-edge sensors observing in frequency bands centered at 90 GHz and 150 GHz. The 24,080 detectors in the SPT-3G+ receiver will be cooled to 100 mK by a dilution refrigerator and read out using microwave SQUID multiplexing. The optical design of the receiver enables a 4 degree diameter field of view, which is broken up into 14 individual optics tubes each containing cryogenic alumina, silicon, and nylon lenses. These technology choices will allow the SPT-3G+ receiver to improve on the mapping speed of the currently operating SPT-3G receiver by nearly an order of magnitude. Once deployed, the SPT-3G+ receiver will observe for 6-years an area overlapping with the BICEP survey to achieve a combined (90 GHz and 150 GHz) CMB map depth of 0.5 uK-arcmin. Data from these observations will be used to create unprecedentedly deep CMB lensing maps, discover new galaxy clusters, and detect astrophysical transients. The lensing map produced by SPT-3G+ will be used to remove or “delens” foreground B modes, where large-scale structure gravitationally lenses the CMB and converts E modes into B-mode polarization, with the goal of revealing inflationary B modes. Together with data from the BICEP Array as part of the South Pole Observatory, SPT-3G+ data will be used to constrain the tensor-to-scalar ratio r with a goal of achieving a measurement of σ(r) = 0.001.

Item Type:	Conference or Workshop Item - published (Paper)
Date Type:	Publication
Status:	Published
Schools:	Schools > Physics and Astronomy Schools > Physical, Chemical & Environmental Sciences
Additional Information:	Article number: 141560A
Publisher:	Society of Photo-optical Instrumentation Engineers
ISSN:	0277-786X
Last Modified:	27 Aug 2026 13:15
URI:	https://orca.cardiff.ac.uk/id/eprint/189211

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