Low-temperature noise performance of superspec and other developments on the path to deployment

McGeehan, R., Barry, P. S., Shirokoff, E., Bradford, C. M., Che, G., Glenn, J., Gordon, S., Hailey-Dunsheath, S., Hollister, M., Kovács, A., LeDuc, H. G., Mauskopf, P., McKenney, C., Reck, T., Redford, J., Tucker, Carole ORCID: https://orcid.org/0000-0002-1851-3918, Turner, J., Walker, S., Wheeler, J. and Zmuidzinas, J. 2018. Low-temperature noise performance of superspec and other developments on the path to deployment. Journal of Low Temperature Physics 193 (5-6) , pp. 1024-1032. 10.1007/s10909-018-2061-6

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Abstract

SuperSpec is a compact on-chip spectrometer operating at mm and sub-mm wavelengths which will enable the construction of sensitive multibeam spectrometers. SuperSpec employs a filter bank architecture, consisting of lithographically patterned niobium superconducting microstrip mm-wave resonators. The power admitted by each resonator is detected by a titanium nitride lumped-element kinetic inductance detector (KID) with resonant frequency from 100 to 200 MHz. We present a characterization of the detector noise performance down to 10 mK measured in a dark setting. We report a device NEP of 2.7×10−18W Hz−1/2 at 210 mK, which is below the expected photon noise level at high-altitude ground-based observatories. The NEP decreases to a constant value of approximately 7.0×10−19W Hz−1/2 below 130 mK. The white noise is well modeled by thermal generation–recombination noise (GR noise) down to 130 mK and a noise floor at low temperatures. Moreover, the addition of low-pass coaxial filters further reduces the noise floor to achieve an NEP of 5.7×10−19W Hz−1/2 below 100 mK. We discuss a photolithographic technique to adjust KID resonances that results in an f0 designed versus measured scatter of 1.7×10−5, which will allow a significant reduction in resonators lost to clashes in full-scale designs. Finally, we present a demonstration of a new ROACH-2-based readout system operating below 500 MHz and show preliminary data indicating the suitability of this system for future highly multiplexed KID arrays.

Item Type:	Article
Date Type:	Published Online
Status:	Published
Schools:	Physics and Astronomy
Publisher:	Springer
ISSN:	0022-2291
Date of Acceptance:	27 August 2018
Last Modified:	16 May 2023 11:35
URI:	https://orca.cardiff.ac.uk/id/eprint/155707

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