NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Collections About News Help Login
Back to Results
Characterization of the JWST Pathfinder Mirror Dynamics Using the Center of Curvature Optical Assembly (CoCOA)The JWST (James Webb Space Telescope) Optical Telescope Element (OTE) consists of a 6.6 meter clear aperture, 18-segment primary mirror, all-reflective, three-mirror anastigmat operating at cryogenic temperatures. To verify performance of the primary mirror, a full aperture center of curvature optical null test is performed under cryogenic conditions in Chamber A at NASA Johnson Space Center using an instantaneous phase measuring interferometer. After phasing the mirrors during the JWST Pathfinder testing, the interferometer is utilized to characterize the mirror relative piston and tilt dynamics under different facility configurations. The correlation between the motions seen on detectors at the focal plane and the interferometer validates the use of the interferometer for dynamic investigations. The success of planned test hardware improvements will be characterized by the multi-wavelength interferometer (MWIF) at the Center of Curvature Optical Assembly (CoCOA).
Document ID
20160007991
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Wells, Conrad (Harris Corp. Rochester, NY, United States)
Hadaway, James B. (Alabama Univ. Huntsville, AL, United States)
Olczak, Gene (Harris Corp. Rochester, NY, United States)
Cosentino, Joseph (Harris Corp. Rochester, NY, United States)
Johnston, John D. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Whitman, Tony (Harris Corp. Rochester, NY, United States)
Connolly, Mark (Harris Corp. Rochester, NY, United States)
Chaney, David (Ball Aerospace and Technologies Corp. Boulder, CO, United States)
Knight, J. Scott (Ball Aerospace and Technologies Corp. Boulder, CO, United States)
Telfer, Randal (Space Telescope Science Inst. Baltimore, MD, United States)
Date Acquired
June 28, 2016
Publication Date
June 26, 2016
Subject Category
Optics
Electronics And Electrical Engineering
Report/Patent Number
GSFC-E-DAA-TN33022-1
Meeting Information
Meeting: SPIE Astronomical Telescopes & Instrumentation 2016
Location: Edinburgh
Country: United Kingdom
Start Date: June 26, 2016
End Date: July 1, 2016
Sponsors: International Society for Optical Engineering
Funding Number(s)
CONTRACT_GRANT: NAS5-02200
CONTRACT_GRANT: NNG11FD64C
CONTRACT_GRANT: NAS5-03127
Distribution Limits
Public
Copyright
Public Use Permitted.

Related Records

IDRelationTitle20160007992See AlsoCharacterization of the JWST Pathfinder Mirror Dynamics Using the Center of Curvature Optical Assembly (CoCOA)
No Preview Available