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JWST Mirror and I&T Progress. Lee Feinberg JWST Optical Telescope Element Manager NASA/GSFC Jan 5 th , 2010. JWST Mirror Development History. 2008. 2010. PM Segments Complete (2011). Brush Wellman Blank Production Completed (2008). PM EDU Coated and Complete. - PowerPoint PPT Presentation
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Page 1
JWST Mirror and I&T Progress
Lee FeinbergJWST Optical Telescope Element Manager
NASA/GSFCJan 5th, 2010
Page 2
1998
2000
2002
2004
2006
SIRTF Monolithic BeMirror Manufacturing
Mirror Manufacturing SBIR’s
NMSD
AMSD Phase 1
AMSD Phase 2
NAR
* NASA HST, Chandra,SIRTF Lessons Learned - TRL 6 by NAR - Implement an active riskmanagement process early in theprogram ( Early investiment)
text
Onset NGST1996
text
JWST PrimaryOptic TechnologySelected - TRL 5.5
JWST MirrorRisk Reduction TRL 6
text
Completevibro-
acoustics Test
Tinsley Large Optics Facility for
JWST (2007)
Tinsley Large Optics Facility for
JWST (2007)
Brush WellmanBlank Production
Completed(2008)
Brush WellmanBlank Production
Completed(2008)
Technology Readiness Level 6 DemonstratedTechnology Readiness Level 6 Demonstrated
2008 2010
XRCF Cryo Testing(2009-2011)
XRCF Cryo Testing(2009-2011)
Axsys MachiningComplete (2009)Axsys MachiningComplete (2009)
EDU Ambient Polishing
PM EDU Coated and Complete
PM SegmentsComplete
(2011)
NARULE
Be
JWSTAxsys
MachiningFacility
JWST Mirror Development History
Page 3
Integration & Cryo Test Results
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
Integration Deformation Cryogenic Deformation
A2
A4
C3
All surface maps: Piston, Tilts and Power removed
Page 4
EDU Cryo-Polishing Complete, Ready for Cryo Test Confirmation!
Mid Frequency
High Frequency
Total Surface ErrorHit Map, Radius, Decenter, and Clocking Removed
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
AMSD Circa 2003
Page 5
Flight Segment Figure Convergence at Tinsley
10
100
1000
10000
100000
0 10 20 30 40 50 60 70CCOS Iteration
RM
S S
urf
ace
Fig
ure
(n
m)
Baseline Convergence Plan
Initial XRCF Delivery Target
Final Delivery Requirement
EDU
A1
A2
A3
A4
A5
A6
B2
B3
B5
B6
B7
B8
C1
C2
C3
C4
C5
C6
C7 (PFL)
The 18 Flight Primary Mirror Segments are Converging to Plan
Includes Figure Grind, Smoothout Grind, Rough
Polish, Smoothout Polish and Fine Polish
All segments at pre-ship target
• EDU has converged to final
requirements!
• EDU has converged to final
requirements!
Polishing Iteration
Page 6
Secondary Mirror Assembly
SM substrateSM substrate
Ball SM test opticsBall SM test optics Ball SMA optical testBall 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
SMA HexapodSMA Hexapod
Page 7
Secondary Mirror Engineering Design Unit and Flight Mirror Progressing Well
Config 1: P-V = 2 um
RMS =0.37 um
Config 1 : P-V = 0.16 um
RMS = 29 nm rms
SMA EDU Assembled and in Cryo Test
SMA Flight Completing Initial Polish Operations
Reqt: 27nm
EDU Reqt: 100nm
Page 8
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
Secondary Mirror Engineering Design Unit Met Requirements after Vibration
TMA on Vibration TableTMA on Vibration Table TMA and Vibe Plate in Optical TestTMA and Vibe Plate in Optical Test
All surface maps: Piston, Tilts and power removed
Measured:
1.6nm-RMS
11.34nm-PV
Requirement:
<3.5nm-RMS
Page 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 = 34 nmRMS = 7.3 nm
SFE is relative to target map
P-V = 110 nmRMS = 13 nm
FSM in Final Polish operations 18.7nm reqt for total WFE
SFE is relative to target map
Page 10
JWST Dedicated Mirror Coating Chamber at QCI/Denton
Page 11
Primary Mirror Installation Demonstration
15m15m
7m
Optics Integration Gantry System
Installation Arm with Primary Mirror Segment
Simulator attached
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 SSDIFSSDIF OIGS/PAIF design
Page 12
First of Three Autocollimating Flats
The first Autocollimating Flat Assembly has been completed and is currently in
cryo testing to verify mirror performance
Page 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
Page 14
Acknowledgement
Thanks to NGAS, Ball Aerospace, ITT and L3 Communications/SSG-Tinsley for providing the data and many of the pictures presented in this package