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Engineeringthe

James Webb Space Telescope

Paul GeithnerJWST Deputy Project Manager - Technical

March 26, 2011

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JWST Architecture is Driven by Science

JWST sees in the infrared because that is where the science is

Large telescope optics collect and focus light

Telescope and Scientific Instruments are cold for sensitivity

Sunshield allows the telescope and instruments to get cold

JWST is lightweight and deployable so it can be launched economically

L2 is an ideal place for an infrared observatory

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JWST Design

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Launch Segment

Launch Vehicle

Payload Adapter

Launch Site Services

Ariane Launcher

Provided by NASA

Provided by NGProvided by Space Telescope Science Institute (STScI)

Provided by ESAProvided by CSA

The Whole JWST System

Ground Segment

Science and Operations Center (SOC)

Common Systems

Institutional Systems

Deep Space NetworkSpace Telescope Science Institute

Observatory Segment

Optical Telescope Element (OTE)

Spacecraft Element (SE)

Spacecraft Bus

Integrated Science Instrument Module (ISIM)

JWST Observatory

NIRCam NIRSpec FGSMIRI

Sunshield

OTE + ISIM (OTIS)

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Primary Mirror Segments

All 18 flight primary mirror segments and one spare have been fully assembled

10 of 18 flight primary mirrors are through final polish, 8 through coating

Completed vibration acceptance testing on 5 of 18 flight mirrors

6 coated mirrors are being prepared for final cryo-optical verification

Mirror Assembly at Ball

Coated Primary Mirror at QCI Preparation for Shipment to XRCF

Inspection at Tinsley

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Primary Mirror Testing

Completed cryo deformation testing of all flight mirrors (XRCF tests 1-5) First of three final cryo verification tests starts this April (XRCF tests 6-8)

Element Progress

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Secondary Mirror Assembly

Flight Secondary Mirror is through cryogenic deformation testing and is currently in final polishing

Element Progress

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Telescope Structure

Mirror Backplane Pathfinder complete –To be delivered to NGAS 3/11

Flight Deployable Tower AssemblyUnder construction

Flight Secondary Mirror Support Struts fabrication complete

Element Progress

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Telescope Assembly Tooling

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• Critical early demonstration of the primary mirror segment assembly (PMSA) installation process

Simulated Primary Mirror

Segment

Element Progress

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U.S. Science Instrument (NIRCam)

Shortwave Camera LensFirst Fold Mirrors in Cryo Test

Flight Long Wave Filter Wheel

Element Progress

EngineeringTestUnit

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European Space Agency (ESA)Science Instruments (NIRSpec & MIRI)

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Flight Mid-Infrared Imager (MIRI; ESA)

Element Progress

Flight Near-Infrared Spectrograph (NIRSpec; ESA)

Element Progress

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Canadian Space Agency (CSA)Science Instrument (FGS/TF)

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Flight Fine Guidance Sensor/Tunable Filter

Element Progress

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Integrated Science Instrument Module (ISIM)

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ISIM preparing for cryogenic testing

Element Progress

The ISIM holds the science instruments and also provides common services such a power and thermal control

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Telescope Testing Chamber at Johnson Space Center

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Largest simulation of deep space everattempted will be done here

Notice people for scale

Telescope and science instruments installed in the test chamber

Element Progress

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Primary Mirror Segments

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PROGRAM PHASESToday

Concept Development Design, Fabrication, Assembly and Test

FormulationAuthorization

Preliminary Design Review (PDR) / Non-Advocate Review (NAR)(Program Commitment)

Launch

Commissioning / science operations ...

Initial Confirmation Review (ICR)

Phase A Phase B Phase C/D Phase E

Formulation Implementation …

TechnicalNon-Advocate

Review (T-NAR)

Critical Design Review (CDR)

Backplane Center Sections – PF and Flight

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• JWST is well into development. Much of the flight hardware and the critical tooling and facilities needed to assemble and test it have been built or are being built.

• JWST’s cost has grown and its development schedule has slipped since 2008 when NASA made cost and schedule commitments to Congress. An independent review was conducted in 2010, and in response some organizational changes have been made and remaining development is being replanned, but work to go is clear and progress continues.

Program Status

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The JWST team has made much progress and the JWST system is coming together Final design and construction of flight hardware and

critical tooling and facilities is nearing completion

Summary

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JWST is Awesome!