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Low-Temperature Noise Performance of SuperSpec and Other Developments on the Path to Deployment

McGeehan, R. and Barry, P. S. and Shirokoff, E. and Bradford, C. M. and Che, G. and Glenn, J. and Gordon, S. and Hailey-Dunsheath, S. and Hollister, M and Kovács, A. and LeDuc, H. G. and Mauskopf, P. and McKenney, C. and Reck, T. and Redford, J. and Tucker, C. and Turner, J. and Walker, S. and 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. ISSN 0022-2291. doi:10.1007/s10909-018-2061-6.

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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^(−18)W 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^(−19)W 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^(−19)W 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
Related URLs:
URLURL TypeDescription ReadCube access
McGeehan, R.0000-0001-5306-8285
Shirokoff, E.0000-0002-2757-1423
Bradford, C. M.0000-0001-5261-7094
Glenn, J.0000-0001-7527-2017
Hailey-Dunsheath, S.0000-0002-8504-7988
Kovács, A.0000-0001-8991-9088
Mauskopf, P.0000-0001-6397-5516
McKenney, C.0000-0003-4917-4872
Reck, T.0000-0003-1425-0177
Tucker, C.0000-0002-1851-3918
Turner, J.0000-0003-4625-2951
Wheeler, J.0000-0003-1349-6538
Additional Information:© Springer Science+Business Media, LLC, part of Springer Nature 2018. Received: 15 November 2017 / Accepted: 27 August 2018. This material is based upon work supported by the National Science Foundation under Grant No. AST-1407457. Partial support was also provided by the NASA Space Technology Research Fellowship NNX15AQ09H.
Group:Astronomy Department
Funding AgencyGrant Number
NASA Space Technology Research FellowshipNNX15AQ09H
Subject Keywords:SuperSpec · Kinetic inductance detector · NEP · TiN · Spectrometer · ROACH-2
Issue or Number:5-6
Record Number:CaltechAUTHORS:20180917-125104660
Persistent URL:
Official Citation:McGeehan, R., Barry, P.S., Shirokoff, E. et al. J Low Temp Phys (2018) 193: 1024.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:89683
Deposited By: George Porter
Deposited On:17 Sep 2018 21:13
Last Modified:16 Nov 2021 00:37

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