Spectral characterization and performance of SPT-SLIM on-chip filterbank spectrometers
C. S. Benson, K. Fichman, M. Adamic, A. J. Anderson, P. Barry, B. A. Benson, E. Brooks, J. E. Carlstrom, T. Cecil, C. L. Chang, K. R. Dibert, M. Dobbs, K. S. Karkare, G. K. Keating, A. M. Lapuente, M. Lisovenko, D. P. Marronexi, J. Montgomery, T. Natoli, Z. Pan, A. Rahlin, G. Robson, M. Rouble, G. Smecherxii, V. Yefremenko, M. R. Young, C. Yu, J. A. Zebrowski, C. Zhang
Published: 2025/9/2
Abstract
The South Pole Telescope Shirokoff Line Intensity Mapper (SPT-SLIM) experiment is a pathfinder for demonstrating the use of on-chip spectrometers for millimeter Line Intensity Mapping. We present spectral bandpass measurements of the SLIM spectrometer channels made on site using a Fourier Transform Spectrometer during SPT-SLIMs first deployment the 2024-2025 austral summer observing season. Through this we demonstrate a technique for measuring the narrow band passes of the SPT-SLIM filterbanks that improves beyond the intrinsic resolution of a Fourier Transform Spectrometer.