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

J. Hunacek; J. Bock; C. M. Bradford; V. Butler; T. C. Chang; Y. T. Cheng; A. Cooray; A. Crites; C. Frez; S. Hailey-Dunsheath; B. Hoscheit; D. W. Kim; C. T. Li; D. Marrone; L. Moncelsi; E. Shirokoff; B. Steinbach; G. Sun; I. Trumper; A. Turner; B. Uzgil; A. Weber; M. Zemcov

doi:10.1007/s10909-018-1906-3

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

J. Hunacek, J. Bock, C. M. Bradford, V. Butler, T. C. Chang, Y. T. Cheng, A. Cooray, A. Crites, C. Frez, S. Hailey-Dunsheath, B. Hoscheit, D. W. Kim, C. T. Li, D. Marrone, L. Moncelsi, E. Shirokoff, B. Steinbach, G. Sun, I. Trumper, A. TurnerB. Uzgil, A. Weber, M. Zemcov

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

Abstract

TIME is a mm-wavelength grating spectrometer array that will map fluctuations of the 157.7-μ m 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 μ m silicon nitride legs targeting a photon-noise-dominated NEP ∼1×10-17W/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.

Original language	English (US)
Pages (from-to)	893-900
Number of pages	8
Journal	Journal of Low Temperature Physics
Volume	193
Issue number	5-6
DOIs	https://doi.org/10.1007/s10909-018-1906-3
State	Published - Dec 1 2018

Keywords

Bolometers
Hafnium
Magnetic shielding
Spectrometers
Transition-edge sensors

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics
General Materials Science
Condensed Matter Physics

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10.1007/s10909-018-1906-3

Cite this

Hunacek, J., Bock, J., Bradford, C. M., Butler, V., Chang, T. C., Cheng, Y. T., Cooray, A., Crites, A., Frez, C., Hailey-Dunsheath, S., Hoscheit, B., Kim, D. W., Li, C. T., Marrone, D., Moncelsi, L., Shirokoff, E., Steinbach, B., Sun, G., Trumper, I., ... Zemcov, M. (2018). Hafnium Films and Magnetic Shielding for TIME, A mm-Wavelength Spectrometer Array. Journal of Low Temperature Physics, 193(5-6), 893-900. https://doi.org/10.1007/s10909-018-1906-3

Hunacek, J, Bock, J, Bradford, CM, Butler, V, Chang, TC, Cheng, YT, Cooray, A, Crites, A, Frez, C, Hailey-Dunsheath, S, Hoscheit, B, Kim, DW, Li, CT, Marrone, D, Moncelsi, L, Shirokoff, E, Steinbach, B, Sun, G, Trumper, I, Turner, A, Uzgil, B, Weber, A & Zemcov, M 2018, 'Hafnium Films and Magnetic Shielding for TIME, A mm-Wavelength Spectrometer Array', Journal of Low Temperature Physics, vol. 193, no. 5-6, pp. 893-900. https://doi.org/10.1007/s10909-018-1906-3

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

abstract = "TIME is a mm-wavelength grating spectrometer array that will map fluctuations of the 157.7-μ m 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 μ m silicon nitride legs targeting a photon-noise-dominated NEP ∼1×10-17W/Hz. Hafnium films are explored as a lower-Tc alternative to Ti (500 mK) for TIME TESs, allowing thicker support legs for improved yield. Hf Tc 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.",

keywords = "Bolometers, Hafnium, Magnetic shielding, Spectrometers, Transition-edge sensors",

author = "J. Hunacek and J. Bock and Bradford, {C. M.} and V. Butler and Chang, {T. C.} and Cheng, {Y. T.} and A. Cooray and A. Crites and C. Frez and S. Hailey-Dunsheath and B. Hoscheit and Kim, {D. W.} and Li, {C. T.} and D. Marrone and L. Moncelsi and E. Shirokoff and B. Steinbach and G. Sun and I. Trumper and A. Turner and B. Uzgil and A. Weber and M. Zemcov",

note = "Funding Information: Acknowledgements 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. Publisher Copyright: {\textcopyright} 2018, Springer Science+Business Media, LLC, part of Springer Nature.",

year = "2018",

month = dec,

day = "1",

doi = "10.1007/s10909-018-1906-3",

language = "English (US)",

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T1 - Hafnium Films and Magnetic Shielding for TIME, A mm-Wavelength Spectrometer Array

AU - Hunacek, J.

AU - Bock, J.

AU - Bradford, C. M.

AU - Butler, V.

AU - Chang, T. C.

AU - Cheng, Y. T.

AU - Cooray, A.

AU - Crites, A.

AU - Frez, C.

AU - Hailey-Dunsheath, S.

AU - Hoscheit, B.

AU - Kim, D. W.

AU - Li, C. T.

AU - Marrone, D.

AU - Moncelsi, L.

AU - Shirokoff, E.

AU - Steinbach, B.

AU - Sun, G.

AU - Trumper, I.

AU - Turner, A.

AU - Uzgil, B.

AU - Weber, A.

AU - Zemcov, M.

N1 - Funding Information: Acknowledgements 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. Publisher Copyright: © 2018, Springer Science+Business Media, LLC, part of Springer Nature.

PY - 2018/12/1

Y1 - 2018/12/1

N2 - TIME is a mm-wavelength grating spectrometer array that will map fluctuations of the 157.7-μ m 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 μ m silicon nitride legs targeting a photon-noise-dominated NEP ∼1×10-17W/Hz. Hafnium films are explored as a lower-Tc alternative to Ti (500 mK) for TIME TESs, allowing thicker support legs for improved yield. Hf Tc 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.

AB - TIME is a mm-wavelength grating spectrometer array that will map fluctuations of the 157.7-μ m 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 μ m silicon nitride legs targeting a photon-noise-dominated NEP ∼1×10-17W/Hz. Hafnium films are explored as a lower-Tc alternative to Ti (500 mK) for TIME TESs, allowing thicker support legs for improved yield. Hf Tc 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.

KW - Bolometers

KW - Hafnium

KW - Magnetic shielding

KW - Spectrometers

KW - Transition-edge sensors

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VL - 193

SP - 893

EP - 900

JO - Journal of Low Temperature Physics

JF - Journal of Low Temperature Physics

IS - 5-6

ER -

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

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