Characterization of filterbank performance for the SuMAC millimeter-wave spectrometer

Kane, Elijah, Barry, Peter, Benson, Chris, Bradford, Charles (Matt), Brien, Thomas, Doyle, Simon ORCID: https://orcid.org/0000-0002-9054-986X, Gómez-Rivera, Victor, Hailey-Dunsheath, Steven, Hernández-Aguilar, Jesús, Hérnandez-Rebollar, José Luis, Hughes, David, Karkare, Kirit S., Lapuente, Alex M., McGeehan, Ryan, Naranjo-Romero, Raúl, Papageorgiou, Andreas, Redford, Joe, Rodríguez-Montoya, Iván, Rowe, Sam, Sánchez-Argüelles, David, Savorgnano, Sofia, Tan, Annie, Becerril-Tapia, Marcial ORCID: https://orcid.org/0000-0002-8739-1731 and Vega, Jair 2026. Characterization of filterbank performance for the SuMAC millimeter-wave spectrometer. Presented at: SPIE Astronomical Telescopes and Instrumentation, Copenhagen, Denmark, 5-10 July 2026. Proceedings of SPIE. , vol.14156 SPIE, p. 175. 10.1117/12.3105816

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Abstract

Large-scale millimeter- and submillimeter-wave survey instruments like TolTEC are capable of identifying thousands of galaxies; however, unraveling the cosmic history of star formation will require spectroscopic follow-up to determine their redshifts. A spectrometer covering a large instantaneous bandwidth is ideal for this follow-up, and is also well-suited for line intensity mapping (LIM) surveys to measure the matter power spectrum across cosmic time. The SuperSpec-MUSCAT collaboration (SuMAC) is the joint effort to operate the SuperSpec spectrometer in the MUSCAT cryostat at the Large Millimeter Telescope (LMT). SuperSpec is an on-chip spectrometer developed to greatly reduce the size and thermal mass of a (sub)millimeter spectrometer. Rather than a conventional grating, SuperSpec uses lithographically patterned filters, which couple to kinetic inductance detectors (KIDs). The filterbank and detectors fit on a silicon chip with an area of only a few square centimeters, allowing for many more spectroscopic pixels to lie in a focal plane. The first light of SuMAC took place at the LMT in Summer 2025, with successful observations of bright sources and LIM-style scans. Three polarization-sensitive pixels were deployed, two of which each cover the 190 – 300 GHz atmospheric window, with a moderate spectral resolution of R ∼ 200. In this paper, we present the spectral characterization of one of the filterbanks of the SuMAC instrument, using Fourier-transform spectroscopy, as well as full filter bank modeling.

Item Type:	Conference or Workshop Item - published (Paper)
Date Type:	Publication
Status:	Published
Schools:	Schools > Physical, Chemical & Environmental Sciences Schools > Physics and Astronomy
Publisher:	SPIE
ISSN:	0277-786X
Last Modified:	27 Aug 2026 11:45
URI:	https://orca.cardiff.ac.uk/id/eprint/189206

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