Ritva Keski-Kuha JWST Deputy OTE Manager May 19, 2009

1. JWST-PRES-012900 JWST OTE Development Status Ritva Keski-Kuha JWST Deputy OTE Manager May 19, 2009

2. Topics • OTE Architecture Refresher • Mirror Status • Backplane Status • I&T Status • Schedule • Summary

3. OTE Architecture Overview • Aft Optics Subsystem (AOS) • Fixed tertiary mirror • Fine steering mirror • Baffle and pupil mask • OTE Electronics Subsystem • CMU Boxes • CJB Box • SM Support Structure (SMSS) • Deployable four-bar linkage strut assembly • Secondary Mirror Mount (SMM) • Thermal Management Subsystem (TMS) • Panel Roof Radiators • Panel +/- V2 Radiators • ISIM Enclosure (MLI) • Parasitic Tray Radiator • SM Assembly (SMA) • Low mass Beryllium mirror • 6 DoF pose control • PM Segment Assembly (PMSA) • 18 low mass Beryllium mirrors • 6 DoF pose control • Radius of curvature control • PM Backplane Assembly (PMBA) • Fixed Center Section supports 12 segments • Two deployable wings support 3 segments each • Deployable Tower Assembly • Deployable telescoping tube • Two deployable harness trays • Cryocooler line accommodation • TMS (continued) • Deployable “bat wings” • Fixed diagonal shield • Deployable stray light “bib” • Not Shown • PMBA thermal management (SLI) • WFS&C Subsystem

4. Three Mirror Anastigmat Optical Design Provides a Wide Field-of-View OTE ISIM V3 (anti-spacecraft) (V1, V3) V2 origin V1 Tertiary Mirror Cassegrain focus Focal Surface Fine Steering Mirror Secondary mirror f/#: 20.0 Effective Focal Length: 131.4 m PM diameter = 6.6 m (circumscribed circle) Primary Mirror

5. Mirror Status • First Cryo test of Flight mirrors has been completed • Hexapod performed well at cryo, cryo distortions of A1 and EDU at XRCF as expected. • All PMSAs have completed grinding and are in the polishing and testing phase which includes fabrication at Tinsley, Integration and Test at Ball, Testing at the XRCF. • The secondary mirror-1 was shipped from Tinsley to Ball. The mirror figure is below the specification. • Tertiary mirror and Fine Steering Mirror making good progress at Ball.

6. Completed 1st PMSA Tests at XRCF Photo Credit MSFC JWST_ISIM.May.MPR/6 JWST_ISIM.May.MPR/1

7. Cryotest #1 Summary • First Cryo Conditioning Cycle, • Mirrors taken to <25K • Measurements made at 28K EDU A1 Measurement Cycle Cryo-Conditioning Cycle #2 Cryo-Conditioning Cycle #1

8. Figure Figure 163.3 182.0 nm rms nm rms Astigmatism Astigmatism 79.4 124.7 nm rms nm rms As-Measured  ROC As-Measured  ROC -2.636 -3.832 mm mm Cryo-Deformation of EDU EDU AMBIENT (Piston, Tilt, Power, Astigmatism, & Gravity Removed) EDU CRYO (Piston, Tilt, Power, Astigmatism, Gravity Removed) Temperature = 292K Dataset: 7040.407AB Temperature = 29K Dataset: 7040.410 MEASUREMENTS RoC Change -18.997 mm Cryo-Deformation (Piston, Tilt, Power Removed) Total Cryo-deformation = 142.7 nm rms Astigmatism Mid/Low Figure High Freq Figure RMS: 115.4 nm rms RMS: 82.0 nm rms RMS 25.0 nm rms DIFFERENCE

9. Significant Accomplishments/StatusL-3 SSG-Tinsley PathfinderEDUFlightFlight TM1 EDU B2 C7 C1 C6 FSM B8 B3 A1 SM1 A6 A2 C5 C2 SM2 A5 A3 B7 A4 B5 C4 C3 As of 4/18/09 B6

10. Secondary Mirror Assembly Progress SM substrate SM Hexapod ready for assembly to substrate Ball SM Test Optics Tinsley SM Test Optics

11. Tertiary Mirror and Fine Steering Mirror TM substrate and sub-bench TM in optical test stand TM testing FSM in vibration testing

12. Mirror Coating Preparation is Progressingat QCI-Denton Coating GSE being loaded into Chamber New JWST Coating Chamber

13. Structures Status • Backplane making good progress at ATK • Flight Center Section bonding in progress • Pathfinder CS bonding going well • Completed layup and cure of the first Pathfinder SMSS strut • Completed SMM (Secondary Mirror Mount) CDA 4/28/09 • Near term reviews • SMSS/PMBA CDA August 2009 • DTA CDA August 2009 • PMBSS CDA September 2009 SMM

14. Tube Billets and SMSS Pathfinder Strut First SMSS Pathfinder Strut Tube billet storage rack

15. Pathfinder and Flight Backplane Assembly

16. I & T Status • Completed CDA for majority of the SSDIF Alignment and Integration Hardware and JSC Test Hardware. • Null lens optics have been ordered • ACF#1 Skip Test execution starting in November 2009 • ACF Mirror Blanks are in procurement • Chamber isolator demonstration is in progress. • PIT Review scheduled for July 2009

17. Ambient Assembly Stand Assembly Support Structures Optics Integration Gantry System +V1-down Configuration HP Struts +V1-up Configuration HP Struts Ambient OTE Assembly Stand & Hardpoint Struts

18. Test GSE Architecture and Subsystems N • Center of Curvature Optical Assembly (COCOA) • COCI (MWL interferometer, null, calibration equipment) • Isolation System • Autocollimating Flat Mirrors (ACF Assembly) • 3 ACFs (actuated motion) • Down Rods • Upper Suspension Frame (USF) • Telescope Tension Rods • Rogue Path • Cryo Position Metrology • Fiber fed PM Lights LN2 and Helium Cryogenic Shrouds • Space Vehicle Thermal Simulator (SVTS) by NG • Hardpoint Offloader Support System (HOSS) Optical Telescope Element (OTE Integrated Science Instrument Assembly (ISIM) – (OTIS) E

19. Architecture Layout Ref. - JSC Chamber A Ref. - OTIS and Thermal Sim(s).

20. NGST OTE Intermediate Schedule

21. Summary • First Cryo test of Flight mirrors has been completed • All PMSAs have completed grinding and are in the polishing and testing phase which includes fabrication at Tinsley, Integration and Test at Ball, Testing at the XRCF • The flight backplane fabrication is in progress • CDA for the majority of the SSDIF Alignment and Integration Hardware and JSC Test Hardware has been completed • OTE CDA Scheduled for October 2009