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

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

    The Review of scientific instruments

    2022  Volume 93, Issue 5, Page(s) 55106

    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 ...

    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.
    Language English
    Publishing date 2022-05-09
    Publishing country United States
    Document type Journal Article
    ZDB-ID 209865-9
    ISSN 1089-7623 ; 0034-6748
    ISSN (online) 1089-7623
    ISSN 0034-6748
    DOI 10.1063/5.0093857
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Book ; Online: The Simons Observatory

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

    Design and Measured Performance of a Carbon Fiber Strut for a Cryogenic Truss

    2022  

    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 (SAT). The truss consists of two aluminum 6061 rings separated by 24 struts. ...

    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 (SAT). 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 K to 1 K) will be less than 1 mW. This strut design may be a promising candidate for use in other cryogenic support structures.
    Keywords Astrophysics - Instrumentation and Methods for Astrophysics ; Physics - Instrumentation and Detectors
    Subject code 621
    Publishing date 2022-01-16
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article ; Online: The Simons Observatory: modeling optical systematics in the Large Aperture Telescope.

    Gudmundsson, Jon E / Gallardo, Patricio A / Puddu, Roberto / Dicker, Simon R / Adler, Alexandre E / Ali, Aamir M / Bazarko, Andrew / Chesmore, Grace E / Coppi, Gabriele / Cothard, Nicholas F / Dachlythra, Nadia / Devlin, Mark / Dünner, Rolando / Fabbian, Giulio / Galitzki, Nicholas / Golec, Joseph E / Patty Ho, Shuay-Pwu / Hargrave, Peter C / Kofman, Anna M /
    Lee, Adrian T / Limon, Michele / Matsuda, Frederick T / Mauskopf, Philip D / Moodley, Kavilan / Nati, Federico / Niemack, Michael D / Orlowski-Scherer, John / Page, Lyman A / Partridge, Bruce / Puglisi, Giuseppe / Reichardt, Christian L / Sierra, Carlos E / Simon, Sara M / Teply, Grant P / Tucker, Carole / Wollack, Edward J / Xu, Zhilei / Zhu, Ningfeng

    Applied optics

    2021  Volume 60, Issue 4, Page(s) 823–837

    Abstract: We present geometrical and physical optics simulation results for the Simons Observatory Large Aperture Telescope. This work was developed as part of the general design process for the telescope, allowing us to evaluate the impact of various design ... ...

    Abstract We present geometrical and physical optics simulation results for the Simons Observatory Large Aperture Telescope. This work was developed as part of the general design process for the telescope, allowing us to evaluate the impact of various design choices on performance metrics and potential systematic effects. The primary goal of the simulations was to evaluate the final design of the reflectors and the cold optics that are now being built. We describe nonsequential ray tracing used to inform the design of the cold optics, including absorbers internal to each optics tube. We discuss ray tracing simulations of the telescope structure that allow us to determine geometries that minimize detector loading and mitigate spurious near-field effects that have not been resolved by the internal baffling. We also describe physical optics simulations, performed over a range of frequencies and field locations, that produce estimates of monochromatic far-field beam patterns, which in turn are used to gauge general optical performance. Finally, we describe simulations that shed light on beam sidelobes from panel gap diffraction.
    Language English
    Publishing date 2021-03-09
    Publishing country United States
    Document type Journal Article
    ISSN 1539-4522
    ISSN (online) 1539-4522
    DOI 10.1364/AO.411533
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

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    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

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