Full-Array Noise Performance of Deployment-Grade SuperSpec mm-wave On-Chip Spectrometers

Abstract

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 $\sim 3\times 10^{-16}\mathrm{W}/\sqrt{\mathrm{Hz}}$ 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.

8 pages, 5 figures. Accepted by the Journal of Low Temperature Physics (Proceedings of the 18th International Workshop on Low Temperature Detectors)

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• Dusty Infrared Galaxies: Sources of the Cosmic Infrared Background
• ALMA [CII] detection of a redshift 7 lensed galaxy behind RXJ1347.1-1145
• MKID development for SuperSpec: an on-chip, mm-wave, filter-bank spectrometer
• An Open Source, FPGA-based LeKID readout for BLAST-TNG: Pre-flight Results
• Constraining the Expansion History and Early Dark Energy with Line Intensity Mapping
• Low Noise Titanium Nitride KIDs for SuperSpec: A Millimeter-Wave On-Chip Spectrometer
• Status of SuperSpec: A Broadband, On-Chip Millimeter-Wave Spectrometer
• WSPEC: A waveguide filter-bank focal plane array spectrometer for millimeter wave astronomy and cosmology

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