jwst mirror and i&t progress

JWST Mirror and I&T Progress

Lee FeinbergJWST Optical Telescope Element Manager

NASA/GSFCJan 5th, 2010

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

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JWST PrimaryOptic TechnologySelected - TRL 5.5

JWST MirrorRisk Reduction TRL 6

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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

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

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

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

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

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

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

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

JWST Dedicated Mirror Coating Chamber at QCI/Denton

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

First of Three Autocollimating Flats

The first Autocollimating Flat Assembly has been completed and is currently in

cryo testing to verify mirror performance

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

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

jwst mirror and i&t progress

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