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JWST Mirror and I&T Progress

This document provides a comprehensive update on the progress of JWST mirror development and testing from 2008 to 2010, covering milestones achieved, cryogenic testing results, polishing operations, and future milestones. Engineering Design Units, flight mirrors, secondary mirrors, fine steering mirrors, and more are discussed, showcasing advancements in mirror technology readiness for JWST.

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JWST Mirror and I&T Progress

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

  2. JWST Mirror Development History 2008 2010 PM Segments Complete (2011) Brush Wellman Blank Production Completed (2008) 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

  3. Integration & Cryo Test Results All surface maps: Piston, Tilts and Power removed Cryogenic Deformation Integration Deformation • 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 A2 A4 C3

  4. 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: 20nm RMS • High Frequency Tinsley Spec: 7nm RMS • Edges are significantly better that AMSD Mid Frequency Total Surface Error Hit Map, Radius, Decenter, and Clocking Removed AMSD Circa 2003 High Frequency

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

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

  7. 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: 100nm • SMA Flight Completing Initial Polish Operations Config 1: P-V = 2 um RMS =0.37 um Reqt: 27nm

  8. Secondary Mirror Engineering Design Unit Met Requirements after Vibration All surface maps: Piston, Tilts and power removed • The SMA completed settling vibration and measured change was below metrology uncertainty • 3 axis settling vibe is defined as Protoflight sineburst and up to -6dB 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 Measured SMA Settling Vibration Change Measured: 1.6nm-RMS 11.34nm-PV Requirement: <3.5nm-RMS TMA on Vibration Table TMA and Vibe Plate in Optical Test

  9. Tertiary Mirror and Fine Steering Mirror and Cryo Polishing Nearly Complete • TMA in Final Polish operations 23.2nm reqt. for total WFE P-V = 110 nm RMS = 13 nm SFE is relative to target map • FSM in Final Polish operations 18.7nm reqt for total WFE P-V = 34 nm RMS = 7.3 nm SFE is relative to target map

  10. JWST Dedicated Mirror Coating Chamber at QCI/Denton

  11. Primary Mirror Installation Demonstration 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 7m 15m 15m SSDIF OIGS/PAIF design Optics Integration Gantry System Installation Arm with Primary Mirror Segment Simulator attached

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

  13. 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

  14. Thanks to NGAS, Ball Aerospace, ITT and L3 Communications/SSG-Tinsley for providing the data and many of the pictures presented in this package Acknowledgement

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