Full-array noise performance of deployment-grade SuperSpec mm-wave on-chip spectrometers

SuperSpec is an on-chip filter bank spectrometer designed for wideband moderate-resolution spectroscopy at millimeter wavelengths, employing TiN kinetic inductance detectors. SuperSpec technology will enable large-format spectroscopic integral field units suitable for high-redshift line intensity mapping and multi-object spectrographs. In previous results, we have demonstrated noise performance in individual detectors suitable for photon noise-limited ground-based observations at excellent mm-wave sites. In these proceedings, we present the noise performance of a full $$R{\sim }275$$ spectrometer measured using deployment-ready RF hardware and software. We report typical noise equivalent powers through the full device of $$\sim \,3 \times 10^{-16}$$$$\hbox {W Hz}^{-1/2}$$ at expected sky loadings, which are photon noise dominated. Based on these results, we plan to deploy a six-spectrometer demonstration instrument to the Large Millimeter Telescope in early 2020.