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Proceedings Paper

Primary mirror segment assembly integration and alignment for the James Webb Space Telescope
Author(s): Conrad Wells; Mark Mallette; David Fischer; Matthew Coon; John Amon; Les Kuipers; John Spina
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Paper Abstract

The Optical Telescope Element (OTE) consists of a 6.6 m, all-reflective, three-mirror anastigmat. The 18-segment primary mirror (PM) presents unique and challenging assembly, integration and alignment verification requirements. Each mirror segment is mechanically integrated with the Primary Mirror Backplane Support Structure (PMBSS) using compound angle shims to compensate for global alignment and local co-planarity errors. The processes used to determine the mechanical shim prescription, primary mirror alignment and integration, and placement verification are discussed. In an effort to reduce process uncertainty and program risk, the JWST program recently conducted a PMSA Integration Demonstration at ITT. Through this activity, full scale demonstrations of the Ground Support Equipment (GSE) and critical integration processes were successfully completed. The results of these demonstrations indicate that the equipment, processes, and procedures developed by ITT meet the critical requirements for PMSA placement.

Paper Details

Date Published: 3 September 2010
PDF: 17 pages
Proc. SPIE 7793, Optical System Alignment, Tolerancing, and Verification IV, 779309 (3 September 2010); doi: 10.1117/12.861871
Show Author Affiliations
Conrad Wells, ITT Corp. (United States)
Mark Mallette, ITT Corp. (United States)
David Fischer, ITT Corp. (United States)
Matthew Coon, ITT Corp. (United States)
John Amon, ITT Corp. (United States)
Les Kuipers, ITT Corp. (United States)
John Spina, ITT Corp. (United States)

Published in SPIE Proceedings Vol. 7793:
Optical System Alignment, Tolerancing, and Verification IV
José Sasián; Richard N. Youngworth, Editor(s)

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