2 August 2014 James Webb Space Telescope (JWST) Optical Telescope Element (OTE) Pathfinder status and plans
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A JWST OTE Pathfinder telescope that includes two spare primary mirror segments, a spare secondary mirror, and a large composite structure with a deployed secondary support structure is in the assembly stage and will be fully completed this year. This Pathfinder will check out key steps in the ambient mirror integration process and also be used at the Johnson Space Center (JSC) to check out the optical Ground Support Equipment (GSE) and associated procedures that will be used to test the full JWST telescope and instruments at JSC. This paper will summarize the Pathfinder integration and testing flow, the critical Ground Support Equipment it will test and the key tests planned with the Pathfinder.
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Lee D. Feinberg, Lee D. Feinberg, Ritva Keski-Kuha, Ritva Keski-Kuha, Charlie Atkinson, Charlie Atkinson, Andrew Booth, Andrew Booth, Tony Whitman, Tony Whitman, "James Webb Space Telescope (JWST) Optical Telescope Element (OTE) Pathfinder status and plans", Proc. SPIE 9143, Space Telescopes and Instrumentation 2014: Optical, Infrared, and Millimeter Wave, 91430E (2 August 2014); doi: 10.1117/12.2054782; https://doi.org/10.1117/12.2054782

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