The Simons Observatory: A large-diameter truss for a refracting telescope cooled to 1 K

Kevin D. Crowley; Peter Dow; Jordan E. Shroyer; John C. Groh; Bradley Dober; Jacob Spisak; Nicholas Galitzki; Tanay Bhandarkar; Mark J. Devlin; Simon Dicker; Patricio A. Gallardo; Kathleen Harrington; Jeffrey Iuliano; Bradley R. Johnson; Delwin Johnson; Anna M. Kofman; Akito Kusaka; Adrian Lee; Michele Limon; Federico Nati; John Orlowski-Scherer; Lyman Page; Michael Randall; Grant Teply; Tran Tsan; Edward J. Wollack; Zhilei Xu; Ningfeng Zhu

doi:10.1063/5.0093857

The Simons Observatory: A large-diameter truss for a refracting telescope cooled to 1 K

Kevin D. Crowley, Peter Dow, Jordan E. Shroyer, John C. Groh, Bradley Dober, Jacob Spisak, Nicholas Galitzki, Tanay Bhandarkar, Mark J. Devlin, Simon Dicker, Patricio A. Gallardo, Kathleen Harrington, Jeffrey Iuliano, Bradley R. Johnson, Delwin Johnson, Anna M. Kofman, Akito Kusaka, Adrian Lee, Michele Limon, Federico NatiJohn Orlowski-Scherer, Lyman Page, Michael Randall, Grant Teply, Tran Tsan, Edward J. Wollack, Zhilei Xu, Ningfeng Zhu

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3 Scopus citations

Abstract

We present the design and measured performance of a new carbon fiber strut design that is used in a cryogenically cooled truss for the Simons Observatory small aperture telescope. The truss consists of two aluminum 6061 rings separated by 24 struts. Each strut consists of a central carbon fiber tube fitted with two aluminum end caps. We tested the performance of the strut and truss by (i) cryogenically cycling and destructively pull-Testing strut samples, (ii) non-destructively pull-Testing the final truss, and (iii) measuring the thermal conductivity of the carbon fiber tubes. We found that the strut strength is limited by the mounting fasteners and the strut end caps, not the epoxy adhesive or the carbon fiber tube. This result is consistent with our numerical predictions. Our thermal measurements suggest that the conductive heat load through the struts (from 4 to 1 K) will be less than 1 mW. This strut design may be a promising candidate for use in other cryogenic support structures.

Original language	English (US)
Article number	055106
Journal	Review of Scientific Instruments
Volume	93
Issue number	5
DOIs	https://doi.org/10.1063/5.0093857
State	Published - May 1 2022

All Science Journal Classification (ASJC) codes

Instrumentation

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Crowley, K. D., Dow, P., Shroyer, J. E., Groh, J. C., Dober, B., Spisak, J., Galitzki, N., Bhandarkar, T., Devlin, M. J., Dicker, S., Gallardo, P. A., Harrington, K., Iuliano, J., Johnson, B. R., Johnson, D., Kofman, A. M., Kusaka, A., Lee, A., Limon, M., ... Zhu, N. (2022). The Simons Observatory: A large-diameter truss for a refracting telescope cooled to 1 K. Review of Scientific Instruments, 93(5), Article 055106. https://doi.org/10.1063/5.0093857

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title = "The Simons Observatory: A large-diameter truss for a refracting telescope cooled to 1 K",

abstract = "We present the design and measured performance of a new carbon fiber strut design that is used in a cryogenically cooled truss for the Simons Observatory small aperture telescope. The truss consists of two aluminum 6061 rings separated by 24 struts. Each strut consists of a central carbon fiber tube fitted with two aluminum end caps. We tested the performance of the strut and truss by (i) cryogenically cycling and destructively pull-Testing strut samples, (ii) non-destructively pull-Testing the final truss, and (iii) measuring the thermal conductivity of the carbon fiber tubes. We found that the strut strength is limited by the mounting fasteners and the strut end caps, not the epoxy adhesive or the carbon fiber tube. This result is consistent with our numerical predictions. Our thermal measurements suggest that the conductive heat load through the struts (from 4 to 1 K) will be less than 1 mW. This strut design may be a promising candidate for use in other cryogenic support structures.",

author = "Crowley, {Kevin D.} and Peter Dow and Shroyer, {Jordan E.} and Groh, {John C.} and Bradley Dober and Jacob Spisak and Nicholas Galitzki and Tanay Bhandarkar and Devlin, {Mark J.} and Simon Dicker and Gallardo, {Patricio A.} and Kathleen Harrington and Jeffrey Iuliano and Johnson, {Bradley R.} and Delwin Johnson and Kofman, {Anna M.} and Akito Kusaka and Adrian Lee and Michele Limon and Federico Nati and John Orlowski-Scherer and Lyman Page and Michael Randall and Grant Teply and Tran Tsan and Wollack, {Edward J.} and Zhilei Xu and Ningfeng Zhu",

note = "Publisher Copyright: {\textcopyright} 2022 Author(s).",

year = "2022",

month = may,

day = "1",

doi = "10.1063/5.0093857",

language = "English (US)",

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journal = "Review of Scientific Instruments",

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Crowley, KD, Dow, P, Shroyer, JE, Groh, JC, Dober, B, Spisak, J, Galitzki, N, Bhandarkar, T, Devlin, MJ, Dicker, S, Gallardo, PA, Harrington, K, Iuliano, J, Johnson, BR, Johnson, D, Kofman, AM, Kusaka, A, Lee, A, Limon, M, Nati, F, Orlowski-Scherer, J, Page, L, Randall, M, Teply, G, Tsan, T, Wollack, EJ, Xu, Z & Zhu, N 2022, 'The Simons Observatory: A large-diameter truss for a refracting telescope cooled to 1 K', Review of Scientific Instruments, vol. 93, no. 5, 055106. https://doi.org/10.1063/5.0093857

TY - JOUR

T1 - The Simons Observatory

T2 - A large-diameter truss for a refracting telescope cooled to 1 K

AU - Crowley, Kevin D.

AU - Dow, Peter

AU - Shroyer, Jordan E.

AU - Groh, John C.

AU - Dober, Bradley

AU - Spisak, Jacob

AU - Galitzki, Nicholas

AU - Bhandarkar, Tanay

AU - Devlin, Mark J.

AU - Dicker, Simon

AU - Gallardo, Patricio A.

AU - Harrington, Kathleen

AU - Iuliano, Jeffrey

AU - Johnson, Bradley R.

AU - Johnson, Delwin

AU - Kofman, Anna M.

AU - Kusaka, Akito

AU - Lee, Adrian

AU - Limon, Michele

AU - Nati, Federico

AU - Orlowski-Scherer, John

AU - Page, Lyman

AU - Randall, Michael

AU - Teply, Grant

AU - Tsan, Tran

AU - Wollack, Edward J.

AU - Xu, Zhilei

AU - Zhu, Ningfeng

PY - 2022/5/1

Y1 - 2022/5/1

N2 - We present the design and measured performance of a new carbon fiber strut design that is used in a cryogenically cooled truss for the Simons Observatory small aperture telescope. The truss consists of two aluminum 6061 rings separated by 24 struts. Each strut consists of a central carbon fiber tube fitted with two aluminum end caps. We tested the performance of the strut and truss by (i) cryogenically cycling and destructively pull-Testing strut samples, (ii) non-destructively pull-Testing the final truss, and (iii) measuring the thermal conductivity of the carbon fiber tubes. We found that the strut strength is limited by the mounting fasteners and the strut end caps, not the epoxy adhesive or the carbon fiber tube. This result is consistent with our numerical predictions. Our thermal measurements suggest that the conductive heat load through the struts (from 4 to 1 K) will be less than 1 mW. This strut design may be a promising candidate for use in other cryogenic support structures.

AB - We present the design and measured performance of a new carbon fiber strut design that is used in a cryogenically cooled truss for the Simons Observatory small aperture telescope. The truss consists of two aluminum 6061 rings separated by 24 struts. Each strut consists of a central carbon fiber tube fitted with two aluminum end caps. We tested the performance of the strut and truss by (i) cryogenically cycling and destructively pull-Testing strut samples, (ii) non-destructively pull-Testing the final truss, and (iii) measuring the thermal conductivity of the carbon fiber tubes. We found that the strut strength is limited by the mounting fasteners and the strut end caps, not the epoxy adhesive or the carbon fiber tube. This result is consistent with our numerical predictions. Our thermal measurements suggest that the conductive heat load through the struts (from 4 to 1 K) will be less than 1 mW. This strut design may be a promising candidate for use in other cryogenic support structures.

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UR - http://www.scopus.com/inward/citedby.url?scp=85131219045&partnerID=8YFLogxK

U2 - 10.1063/5.0093857

DO - 10.1063/5.0093857

M3 - Article

C2 - 35649759

AN - SCOPUS:85131219045

SN - 0034-6748

VL - 93

JO - Review of Scientific Instruments

JF - Review of Scientific Instruments

IS - 5

M1 - 055106

ER -

The Simons Observatory: A large-diameter truss for a refracting telescope cooled to 1 K

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