Status of the James Webb Space Telescope (JWST) Optical Telescope Element (OTE) Northrop Grumman: Charlie Atkinson, Scott C. Texter NASA/GSFC: Lee Feinberg,

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Presentation transcript:

Status of the James Webb Space Telescope (JWST) Optical Telescope Element (OTE) Northrop Grumman: Charlie Atkinson, Scott C. Texter NASA/GSFC: Lee Feinberg, Ritva Keski-Kuha July 6th, 2012

JWST Observatory Breakdown Optical Telescope Element (OTE) Integrated Science Instrument Module (ISIM) Sunshield Spacecraft Bus GSFC 2

OTE Architecture Overview Secondary Mirror Support Structure (SMSS) Primary Mirror Segment Assemblies (PMSA) Primary Mirror Backplane Assembly (PMBA) Thermal Management Subsystem (TMS) ISIM Roof Radiators ISIM Enclosure (MLI) Parasitic Tray Radiator Aft Optics Subsystem (AOS) Secondary Mirror Assembly (SMA) PM Backplane Support Structure (PMBSS) PM Backplane Mechanism Deployment Tower Assembly (DTA) Thermal Management Subsystem (TMS) Deployable “Batwings” Fixed Diagonal Shield Deployable Stray-Light “Bib” OTE Electronics Cold Junction Box Cryo Multiplexer Units Astro 3

All 18 PMSAs are complete!!! 4

Composite Primary Mirror meets requirements 6 PMSAs ready for cryo testing Measured Primary Mirror Cryogenic Surface Figure Error meets requirements 5

PMSA process durations improved with each production batch Final batch CCOS iterations < ½ EDU iterations So, the final batch completed months ahead of schedule. EDU Flight mirrors Excellent convergence rate on flight mirrors 6

Flight SMA is Complete 20K SMA Measured Surface Figure 14.7nm SMA SFE: 19.8nm RMS SFE (including measurement uncertainty) vs. 23.5nm req’t On convex mirror 0.7 meters in diameter. One of the more challenging tasks on the program, and therefore, one of the more spectacular achievements. 7

MirrorMeasured (RMS SFE) Uncertainty (RMS SFE) Total (RMS SFE) Require- ment (RMS SFE) Tertiary18.1 nm9.5 nm20.5 nm 23.2 nm Fine Steering 13.9 nm4.9 nm14.7 nm 18.7 nm The fully integrated AOS is in final test Tertiary Mirror Fine Steering Mirror 8

System transmission meets requirements 9

OTE Structure Status All four SMSS tubes have been manufactured The PMBSS Center Section is complete The Backplane Support Frame (BSF) is in assembly DTA tubes have been produced and machined DTA deployment mechanism qualification testing has started SMSS and PMBA wing deployment mechanisms starting their qualification testing BSF Center Section 10

OTE Electronics are progressing well 11 All 22 CMUs have been assembled and have started testing 2 have completed acceptance testing All but three have completed cryogenic testing; will complete in July. The CJB has been assembled and has completed its acceptance testing. The EM ADU has been delivered and the flight ADU is in board-level testing. EM ADU CMU CJB

OTE Integration and Test Preparation The Ambient Optical Assembly Stand is currently installed at GSFC, ready for optics integration The multi-axis robotic arm used to align and install the PMSAs onto the OTE structure has been demonstrated

Summary: –The OTE continues to make terrific forward progress Acknowledgements –A very large team of very talented individuals –From dozens of organizations across 11 (or more) states