JWST Mirror and IT Progress Lee Feinberg JWST

  • Slides: 14
Download presentation
JWST Mirror and I&T Progress Lee Feinberg JWST Optical Telescope Element Manage NASA/GSFC Jan

JWST Mirror and I&T Progress Lee Feinberg JWST Optical Telescope Element Manage NASA/GSFC Jan 5 th, 2010 Page 1

JWST Mirror Development History 2008 2010 Brush Wellman Blank Production Completed (2008) PM Segments

JWST Mirror Development History 2008 2010 Brush Wellman Blank Production Completed (2008) PM Segments Complete (2011) PM EDU Coated and Complete EDU Ambient Polishing Be Tinsley Large Optics Facility for JWST (2007) XRCF Cryo Testing (2009 -2011) NAR ULE Axsys Machining Complete (2009) JWST Axsys Machining Facility Technology Readiness Level 6 Demonstrated Page 2

Integration & Cryo Test Results All surface maps: Piston, Tilts and Power removed Cryogenic

Integration & Cryo Test Results All surface maps: Piston, Tilts and Power removed Cryogenic Deformation Integration Deformation A 2 § The Engineering Design Unit and 4 flight mirrors have completed cryogenic testing § All 5 primary mirror segments tested to date show between 100 -200 nm rms of cryo deformation § Stability over operational temperature excellent § Figures cycle to cycle stabilized to < 3 nm rms each § Mirrors are sent back to Tinsley for “Cryo Polishing” to compensate for cryo distortion and integration deformation A 4 C 3 Page 3

EDU Cryo-Polishing Complete, Ready for Cryo Test Confirmation! § Primary Mirror EDU Has Completed

EDU Cryo-Polishing Complete, Ready for Cryo Test Confirmation! § Primary Mirror EDU Has Completed Cryo Polishing and Meets (and Beats) All Specifications § Mid Frequency Tinsley Spec: 20 nm RMS § High Frequency Tinsley Spec: 7 nm RMS § Edges are significantly better that AMSD Circa 2003 Total Surface Error Mid Frequency Hit Map, Radius, Decenter, and Clocking Removed High Frequency Page 4

The 18 Flight Primary Mirror Segments are Converging to Plan • EDU has converged

The 18 Flight Primary Mirror Segments are Converging to Plan • EDU has converged to final requirements! All segments at pre-ship target Polishing Iteration Includes Figure Grind, Smoothout Grind, Rough Polish, Smoothout Polish and Fine Polish Page 5

Secondary Mirror Assembly SM substrate SMA Hexapod Ball SM test optics Ball SMA optical

Secondary Mirror Assembly SM substrate SMA Hexapod Ball SM test optics Ball SMA optical test § SM-1 (EDU) is assembled and in cryogenic optical testing at Ball § SM-2 (Flight) is in pre-cryo polishing at Tinsley Page 6

Secondary Mirror Engineering Design Unit and Flight Mirror Progressing Well Config 1 : P-V

Secondary Mirror Engineering Design Unit and Flight Mirror Progressing Well Config 1 : P-V = 0. 16 um RMS = 29 nm rms § SMA EDU Assembled and in Cryo Test EDU Reqt: 100 nm § SMA Flight Completing Initial Polish Operations Config 1: P-V = 2 um RMS =0. 37 um Reqt: 27 nm Page 7

Secondary Mirror Engineering Design Unit Met § The SMA completed settling Requirements after Vibration

Secondary Mirror Engineering Design Unit Met § The SMA completed settling Requirements after Vibration All surface maps: Piston, Tilts and power removed Measured SMA Settling Vibration Change Measured: 1. 6 nm-RMS 11. 34 nm-PV Requirement: <3. 5 nm-RMS vibration and measured change was below metrology uncertainty – 3 axis settling vibe is defined as Protoflight sineburst and up to 6 d. B Random Vibe – SMA Metrology Uncertainty = 3. 5 nm-RMS, Measured Change = 1. 6 nm-RMS § Flight Fine Steering Mirror and Tertiary Mirror also passed vibration test TMA on Vibration Table TMA and Vibe Plate in Optical Test Page 8

Tertiary Mirror and Fine Steering Mirror and Cryo Polishing Nearly Complete § TMA in

Tertiary Mirror and Fine Steering Mirror and Cryo Polishing Nearly Complete § TMA in Final Polish operations 23. 2 nm reqt. for total WFE P-V = 110 nm RMS = 13 nm SFE is relative to target map § FSM in Final Polish operations 18. 7 nm reqt for total WFE P-V = 34 nm RMS = 7. 3 nm SFE is relative to target map Page 9

JWST Dedicated Mirror Coating Chamber at QCI/Denton Page 10

JWST Dedicated Mirror Coating Chamber at QCI/Denton Page 10

Primary Mirror Installation Demonstration 7 m 15 m The Telescope Alignment System is complete

Primary Mirror Installation Demonstration 7 m 15 m The Telescope Alignment System is complete and has been set up at ITT for training operations and demonstration of critical alignment processes prior to shipment to GSFC’s SSDIF OIGS/PAIF design Optics Integration Gantry System Installation Arm with Primary Mirror Segment Simulator attached Page 11

First of Three Autocollimating Flats The first Autocollimating Flat Assembly has been completed and

First of Three Autocollimating Flats The first Autocollimating Flat Assembly has been completed and is currently in cryo testing to verify mirror performance Page 12

Future Milestones § First Cryogenic Test of 6 Mirrors Starts in January 2010 §

Future Milestones § First Cryogenic Test of 6 Mirrors Starts in January 2010 § First Flight Mirrors Coated – Spring 2010 – Fine Steering Mirror, Tertiary Mirror § Flight Secondary Mirror Completes First Round of Polishing – Spring 2010 § Primary Mirror Segment Engineering Design Unit Complete – January 2011 § Flight Secondary Mirror Complete – End of 2011 § All Flight Primary Mirror Segments Complete – End of 2011 § Engineering Design Unit Installed on Pathfinder Backplane – Spring 2011 § Installation of Flight Mirrors on Flight Backplane – 2012 Page 13

Acknowledgement Thanks to NGAS, Ball Aerospace, ITT and L 3 Communications/SSG-Tinsley for providing the

Acknowledgement Thanks to NGAS, Ball Aerospace, ITT and L 3 Communications/SSG-Tinsley for providing the data and many of the pictures presented in this package Page 14