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. doi:10.1007/s10909-018-1906-3. 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.
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| 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 | ||||||||||||||||||||||||
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| Subject Keywords: | Spectrometers; Bolometers; Transition-edge sensors; Hafnium; Magnetic shielding | ||||||||||||||||||||||||
| Issue or Number: | 5-6 | ||||||||||||||||||||||||
| DOI: | 10.1007/s10909-018-1906-3 | ||||||||||||||||||||||||
| 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: | 15 Nov 2021 20:32 |
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