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The James Webb Space TelescopeThe James Webb Space Telescope (JWST) is a 6.6m diameter, segmented, deployable telescope for cryogenic IR space astronomy (approx.40K). The JWST Observatory architecture includes the Optical Telescope Element and the Integrated Science Instrument Module (ISIM) element that contains four science instruments (SI) including a Guider. The ISIM optical metering structure is a roughly 2.2x1.7x2.2mY, asymmetric frame that is composed of carbon fiber and resin tubes bonded to invar end fittings and composite gussets and clips. The structure supports the SIs, isolates the SIs from the OTE, and supports thermal and electrical subsystems. The structure is attached to the OTE structure via strut-like kinematic mounts. The ISM structure must meet its requirements at the approx.40K cryogenic operating temperature. The SIs are aligned to the structure s coordinate system under ambient, clean room conditions using laser tracker and theodolite metrology. The ISM structure is thermally cycled for stress relief and in order to measure temperature-induced mechanical, structural changes. These ambient-to-cryogenic changes in the alignment of SI and OTE-related interfaces are an important component in the JWST Observatory alignment plan and must be verified.
Document ID
20070032650
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Nowak, Maria
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Eichorn, William
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Hill, Michael
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Hylan, Jason
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Marsh, James
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Ohl, Raymond
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Sampler, Henry
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Wright, Geraldine
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Crane, Allen
(Swales Aerospace Greenbelt, MD, United States)
Herrera, Acey
(Swales Aerospace Greenbelt, MD, United States)
Quigley, Robert
(Swales Aerospace Greenbelt, MD, United States)
Jetten, Mark
(Northrop Corp. United States)
Young, Philip
(Young Engineering Services United States)
Date Acquired
August 23, 2013
Publication Date
August 26, 2007
Subject Category
Astronomy
Meeting Information
Meeting: SPIE Optics and Photonics
Location: San Diego, CA
Country: United States
Start Date: August 26, 2007
End Date: August 30, 2007
Sponsors: International Society for Optical Engineering
Distribution Limits
Public
Copyright
Other

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