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Ritva Keski-KuhaRitva Keski-KuhaJWST Deputy OTE ManagerJWST Deputy OTE Manager

May 19, 2009May 19, 2009

JWST OTE Development Status

JWST-PRES-012900

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Topics

1. OTE Architecture Refresher

2. Mirror Status

3. Backplane Status

4. I&T Status

5. Schedule

6. Summary

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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

Aft Optics Subsystem (AOS)• Fixed tertiary mirror• Fine steering mirror• Baffle and pupil mask

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

OTE Electronics Subsystem• CMU Boxes• CJB Box

OTE Architecture Overview

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A1

B1

C6

A2

A3

A4

A5

A6 B2

B3

B4

B5

B6C1

C2

C3C4

C5

6.6 meters flat to flat1.32 meters

flat to flatA1

B1

C6

A2

A3

A4

A5

A6 B2

B3

B4

B5

B6C1

C2

C3C4

C5

A1

B1

C6

A2

A3

A4

A5

A6 B2

B3

B4

B5

B6C1

C2

C3C4

C5

A1

B1

C6

A2

A3

A4

A5

A6 B2

B3

B4

B5

B6C1

C2

C3C4

C5

6.6 meters flat to flat

6.6 meters flat to flat1.32 meters

flat to flat1.32 meters flat to flat

Three Mirror Anastigmat Optical Design Provides a Wide Field-of-View

Ter

tiary

M

irror

OTE ISIM

Cassegrain focus

(V1, V3) origin

f/#: 20.0 Effective Focal Length: 131.4 m PM diameter = 6.6 m (circumscribed circle)

V3 (anti-spacecraft)

V1 V2

Focal Surface

Primary Mirror

Secondary mirror

Fine Steering Mirror

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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.

JWST_ISIM.May.MPR/6

Completed 1st PMSA Tests at XRCF

Photo Credit MSFCJWST_ISIM.May.MPR/1

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Cryotest #1 Summary

First Cryo Conditioning Cycle, – Mirrors taken to <25K– Measurements made at 28K A1

EDU

XRCF Cryogenic Test #1 Timeline

0

50

100

150

200

250

300

0 5 10 15 20

Tem

pera

ture

(K

)

Cry

o-C

ondit

ionin

g C

ycl

e #

1

Cry

o-C

ondit

ionin

g C

ycl

e #

2

Measu

rem

ent

Cycl

e

8

Cryo-Deformation of EDU

EDU CRYO(Piston, Tilt, Power, Astigmatism, Gravity Removed)

EDU AMBIENT(Piston, Tilt, Power, Astigmatism, & Gravity Removed)

Temperature = 292K

Dataset: 7040.407AB

Cryo-Deformation(Piston, Tilt, Power Removed) Astigmatism

RMS: 115.4 nm rms

Mid/Low FigureRMS: 82.0 nm rms

High Freq FigureRMS 25.0 nm rms

MEA

SU

REM

EN

TS

DIF

FER

EN

CE

Total Cryo-deformation = 142.7 nm rms

RoC Change -18.997 mm

mm-2.636As-Measured ROC

nm rms

nm rms182.0Figure

79.4Astigmatism

mm-3.832As-Measured ROC

nm rms

nm rms163.3Figure

124.7Astigmatism

Temperature = 29K

Dataset: 7040.410

9 of 240BATC MSR 04/29/09

Significant Accomplishments/StatusL-3 SSG-Tinsley

As of 4/18/09

TM1

EDU

SM1

Pathfinder EDU Flight Flight

C7

LEGEND

Not at L-3 SSG-Tinsley

Even Slice

Figure Grind

Smooth Out Grind

Rough / Smooth Out Polish Interleave

Fine Figure Polish

Shipped to BATC

Cryo Null Figure

Final Optical Test

Delivered

– – – – – Pathfinder

C5

B8

C6

B3

C1

C2

A1

A6

A5

A2

C4

A3

A4

C3

B5

B6

B7

SM2

B2

FSM

10mjm-09-tms-0852

Secondary Mirror Assembly Progress

SM Hexapod ready for assembly to substrateSM Hexapod ready for assembly to substrateSM substrateSM substrate

Ball SM Test OpticsBall SM Test Optics Tinsley SM Test OpticsTinsley SM Test Optics

11mjm-09-tms-0852

Tertiary Mirror and Fine Steering Mirror

TM substrate and sub-benchTM substrate and sub-bench

TM testingTM testing

TM in optical test standTM in optical test stand

FSM in vibration testing

12mjm-09-tms-0852

Mirror Coating Preparation is Progressingat QCI-Denton

New JWST Coating ChamberNew JWST Coating Chamber

Coating GSE being loaded into ChamberCoating GSE being loaded into Chamber

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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

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Tube Billets and SMSS Pathfinder Strut

Tube billet storage rack First SMSS Pathfinder Strut

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Pathfinder and Flight Backplane Assembly

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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

17mjm-09-tms-0852

Ambient Assembly Stand

Assembly Support Structures

+V1-up Configuration

+V1-down Configuration

Ambient OTE Assembly Stand & Hardpoint Struts

HP Struts

HP Struts

Optics Integration Gantry System

18mjm-09-tms-0852

Test GSE Architecture and Subsystems

• Space Vehicle Thermal Simulator (SVTS) by NG

• Hardpoint Offloader Support System (HOSS)

Center of Curvature Optical Assembly (COCOA)

• COCI (MWL interferometer, null, calibration equipment)

Autocollimating Flat Mirrors (ACF Assembly)

• 3 ACFs (actuated motion)

• Rogue Path• Cryo Position Metrology• • Fiber fed PM Lights

• Down Rods• Upper Suspension Frame (USF)• Telescope Tension Rods

Optical Telescope Element (OTE Integrated Science Instrument Assembly (ISIM) – (OTIS)

• Isolation System

LN2 and Helium Cryogenic Shrouds

N

E

19mjm-09-tms-0852

Architecture Layout

Chamber Isolation Assembly

Telescope Rod Assembly

ACF to PM 39.0 ft

(11.9 m)

OTIS

HOSS

COCOA

26.3 ft(8.0 m)

COCOA to PM

Distance52.1 ft

(15.9 m)

ACF 3X

Upper Suspension

Frame

+V1

+V2

56.2 ft(17.1 m)

Top of HOSS to GHe Shroud5.8 ft (1.8 m)

Port Flangeto

GHe Shroud89.4 ft

(27.2 m)

Ref. - JSC Chamber A

Ref. - OTIS and Thermal Sim(s).

20 of 240BATC MSR 04/29/09

NGST OTE Intermediate Schedule

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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