1 Engineering the James Webb Space Telescope Paul Geithner JWST Deputy Project Manager - Technical March 26, 2011

2 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

3 JWST Design

4 4 Launch Segment Launch Vehicle Payload Adapter Launch Site Services Ariane Launcher Provided by NASA Provided by NG Provided by Space Telescope Science Institute (STScI) Provided by ESA Provided by CSA The Whole JWST System Ground Segment Science and Operations Center (SOC) Common Systems Institutional Systems Deep Space Network Space Telescope Science Institute Observatory Segment Optical Telescope Element (OTE) Spacecraft Element (SE) Spacecraft Bus Integrated Science Instrument Module (ISIM) JWST Observatory NIRCamNIRSpecFGS MIRI Sunshield OTE + ISIM (OTIS)

5 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

6 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

7 Secondary Mirror Assembly  Flight Secondary Mirror is through cryogenic deformation testing and is currently in final polishing Element Progress

8 Telescope Structure Mirror Backplane Pathfinder complete – To be delivered to NGAS 3/11 Flight Deployable Tower Assembly Under construction Flight Secondary Mirror Support Struts fabrication complete Element Progress

9 Telescope Assembly Tooling Page 9 Critical early demonstration of the primary mirror segment assembly (PMSA) installation process Simulated Primary Mirror Segment Element Progress

10 U.S. Science Instrument (NIRCam) Shortwave Camera Lens First Fold Mirrors in Cryo Test Flight Long Wave Filter Wheel Element Progress Engineering Test Unit

11 European Space Agency (ESA) Science Instruments (NIRSpec & MIRI) Page 11 Flight Mid-Infrared Imager (MIRI; ESA) Element Progress Flight Near-Infrared Spectrograph (NIRSpec; ESA) Element Progress

12 Canadian Space Agency (CSA) Science Instrument (FGS/TF) Page 12 Flight Fine Guidance Sensor/Tunable Filter Element Progress

13 Integrated Science Instrument Module (ISIM) Page 13 ISIM preparing for cryogenic testing Element Progress The ISIM holds the science instruments and also provides common services such a power and thermal control

14 Telescope Testing Chamber at Johnson Space Center 14 Largest simulation of deep space ever attempted will be done here Notice people for scale Telescope and science instruments installed in the test chamber Element Progress

15 Primary Mirror Segments 15 Program Phases Today Concept DevelopmentDesign, Fabrication, Assembly and Test Formulation Authorization 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 … Technical Non-Advocate Review (T-NAR) Critical Design Review (CDR) Backplane Center Sections – PF and Flight

16 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

17 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

18 JWST is Awesome!