The InfraRed Imaging Spectrograph (IRIS) for TMT: support structure final design

Brian Hoff; Joeleff Fitzsimmons; Gordon Lacy; Jennifer Dunn; Glen Herriot; Jeffrey Crane; Peter Byrnes; Dean Chalmers; David Andersen; Jenny Atwood; Tim Hardy

doi:10.1117/12.2560757

13 December 2020 The InfraRed Imaging Spectrograph (IRIS) for TMT: support structure final design

Brian Hoff, Joeleff Fitzsimmons, Gordon Lacy, Jennifer Dunn, Glen Herriot, Jeffrey Crane, Peter Byrnes, Dean Chalmers, David Andersen, Jenny Atwood, Tim Hardy

Author Affiliations +

Proceedings Volume 11451, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation IV; 114511Z (2020) https://doi.org/10.1117/12.2560757
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Abstract

The Support Structure for the Thirty Meter Telescope (TMT) Infrared Imaging Spectrograph (IRIS) consists of 18 carbonfiber reinforced polymer (CFRP) struts, a CFRP ring and a metal interface frame. This ultra-stiff, lightweight structure suspends the five-ton IRIS Science Cryostat and Rotator below the Narrow Field Infrared Adaptive Optics System (NFIRAOS). Through comprehensive design and analysis driven by requirements for stiffness, optical alignment, adjustability, manufacturability, weight and space, much headway was made to bring this design to fruition. This work presents the current state of design, including material down-selection, adjuster design and strategies for fabrication, alignment and testing. It summarizes methodologies and simulation results examining stiffness, seismic and thermal loads and transmission of vibration between NFIRAOS and IRIS. A prototype strut is being developed and will undergo dynamic mechanical testing to characterize its performance.

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Brian Hoff, Joeleff Fitzsimmons, Gordon Lacy, Jennifer Dunn, Glen Herriot, Jeffrey Crane, Peter Byrnes, Dean Chalmers, David Andersen, Jenny Atwood, and Tim Hardy "The InfraRed Imaging Spectrograph (IRIS) for TMT: support structure final design", Proc. SPIE 11451, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation IV, 114511Z (13 December 2020); https://doi.org/10.1117/12.2560757

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