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Hafnium Films and Magnetic Shielding for TIME, A mm-Wavelength Spectrometer Array

Hunacek, J. and Bock, J. J. and Bradford, C. M. and Butler, V. and Chang, T.-C. and Cheng, Y.-T. and Cooray, A. and Crites, A. and Frez, C. and Hailey-Dunsheath, S. and Hoscheit, B. and Kim, D. W. and Li, C.-T. and Marrone, D. and Moncelsi, L. and Shirokoff, E. and Steinbach, B. and Sun, G. and Trumper, I. and Turner, A. and Uzgil, B. and Weber, A. and Zemcov, M. (2018) Hafnium Films and Magnetic Shielding for TIME, A mm-Wavelength Spectrometer Array. Journal of Low Temperature Physics, 193 (5-6). pp. 893-900. ISSN 0022-2291. https://resolver.caltech.edu/CaltechAUTHORS:20180416-085137740

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Abstract

TIME is a mm-wavelength grating spectrometer array that will map fluctuations of the 157.7-μm emission line of singly ionized carbon ([CII]) during the epoch of reionization (redshift z ∼5–9). Sixty transition-edge sensor (TES) bolometers populate the output arc of each of the 32 spectrometers, for a total of 1920 detectors. Each bolometer consists of gold absorber on a ∼ 3 × 3 mm silicon nitride micro-mesh suspended near the corners by 1 × 1 × 500 μm silicon nitride legs targeting a photon-noise-dominated NEP ∼1×10^(-17)W/√Hz. Hafnium films are explored as a lower-T_c alternative to Ti (500 mK) for TIME TESs, allowing thicker support legs for improved yield. Hf T_c is shown to vary between 250 and 450 mK when varying the resident Ar pressure during deposition. Magnetic shielding designs and simulations are presented for the TIME first-stage SQUIDs. Total axial field suppression is predicted to be 5×10^7.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1007/s10909-018-1906-3DOIArticle
https://rdcu.be/LGLRPublisherFree ReadCube access
ORCID:
AuthorORCID
Hunacek, J.0000-0001-7066-226X
Bock, J. J.0000-0002-5710-5212
Bradford, C. M.0000-0001-5261-7094
Cheng, Y.-T.0000-0002-5437-0504
Cooray, A.0000-0002-3892-0190
Hailey-Dunsheath, S.0000-0002-8504-7988
Marrone, D.0000-0002-2367-1080
Moncelsi, L.0000-0002-4242-3015
Sun, G.0000-0003-4070-497X
Uzgil, B.0000-0001-8526-3464
Zemcov, M.0000-0001-8253-1451
Additional Information:© 2018 Springer Science+Business Media, LLC, part of Springer Nature. Received: 30 October 2017; Accepted: 29 March 2018; First Online: 06 April 2018. JH is supported by the National Science Foundation Graduate Research Fellowship under Grant No. DGE-1144469. AC is supported by the National Science Foundation Astronomy and Astrophysics Postdoctoral Fellowship under Grant No. 1602677.
Group:Astronomy Department
Funders:
Funding AgencyGrant Number
NSF Graduate Research FellowshipDGE-1144469
NSF Astronomy and Astrophysics FellowshipAST-1602677
Subject Keywords:Spectrometers; Bolometers; Transition-edge sensors; Hafnium; Magnetic shielding
Issue or Number:5-6
Record Number:CaltechAUTHORS:20180416-085137740
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20180416-085137740
Official Citation:Hunacek, J., Bock, J., Bradford, C.M. et al. J Low Temp Phys (2018) 193: 893. https://doi.org/10.1007/s10909-018-1906-3
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:85871
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:16 Apr 2018 21:20
Last Modified:23 Oct 2020 18:24

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