The Space Telescope and The Lagrangian Point

 Launch Scheduled for 2018 by European Space Agency  18 Segment Primary Mirror (Gold-plated Beryllium; 25m 2 )  L-2 Orbit Enables Passive Cooling to 45 Kelvin James Webb Space Telescope (JWST) -378 o F  Operational Life >10 years; Mass ~ 6000 kg 6.7 tons !  Four Instruments: – Near-Infrared Camera – Near-IR Spectrometer – Fine Guidance Sensor – Mid-Infrared Instrument

3 Full-Scale Model at Goddard Space Flight Center

Largest Cryogenic Telescope Ever Built Seven Times the Light-Gathering Capability of the Hubble Space Telescope Wavelength Spectrum Coverage from Optical to Infrared Similar Angular Resolution Hugh Variety of Analysis Available to Users JWST, 1000s per band (simulated)

If the JWST observatory were sitting on the surface of the earth looking at the moon and a night light* were turn on or a candle + were lit on the dark side of the moon the observatory would detect it**! Fun Facts – Detector/Sensing Capability Assumes: 5W gray-body emitter w/o atmosphere

JWST Architecture

Primary mirror mass properties substrate: 21.8 kg segment assembly: 39.4 kg OTE area density: ~28 kg m -2 HST (ULE) ~ 180 kg m -2 Keck (Zerodur) ~ 2000 kg m -2 Telescope mirrors are fabricated from Beryllium Key physical properties of beryllium (Be): low coefficient of thermal expansion at 50 K high thermal conductivity high stiffness to mass ratio Type O-30 spherical powder uniform CTE, high packing density, low oxide content

Mirror Manufacturing 250 kgs After Before 21 kgs Be Billet Finished Mirror Segment Beryllium Dust is Recycled Over 90% of material is removed to make each mirror segment! (Want a little Mirror with your Beryllium dust?) 8

Mirror Surface Tolerance Surface of a Primary Mirror Section Assembly (PMSA) Allowable PMSA Surface Error End section of a typical human hair 9

Cryo Cycle 5 at MSFC XRCF with Gold-Coated EDU 10

Cryogenic Optical Testing & Metrology Preparations of the Primary Mirror Section at Marshal Space Flight Center’s X-Ray & Cryogenic Facility

Integrated Science Instrument Module (ISIM) ISIM is composed of: JWST Data Acquisition & Analysis Instruments Structure, Thermal, Comm. & Control Systems Region 1: Science Instrument Optics Assemblies Near Infrared Camera (NIRCam) Near Infrared Spectrograph (NIRSpec) Mid Infrared Instrument (MIRI) Fine Guidance Sensor w/Tunable Filter (FGS/TF) Optical Bench Structure Radiators and support structure Region 2: Electronics Compartment Focal Plane Electronics (FPE) Instrument Control Electronics (ICE, MCE) ISIM Remote Services Unit (IRSU) Region 3 Command & Data Handling (C&DH) Electronics

JWST Science Instruments

Side View of Stowed JWST (no Sunshield) Top View Stowed JWST Payload Fairing ESC-A Upper Stage H155 Core Stage P230 Solid Booster Vulcan Engine 51.4 m (170 ft) Ariane 5 Launch Configuration 5 m (16 ft)

Integration &Test Flow Overview GSFC SSDIF NGAS M8, M4 TV NGAS M8 NGST M8 GSFC SSDIF ISIM I&T Spacecraft Panel I&T OTE I&T Sunshield I&T OTE Structure I&T GSFC SSDIF, JSC 32 OTE/ISIM I&T Cryo Optics Test Spacecraft Element I&T Facility N/A I&T Responsibility Execution NASA NGAS ITT ESA / Arianespace CSG S5, BAF, ZL3 NGAS M8, LATF, M4 Vibe Complete Observatory I&T Launch Site I&T LV Integ Launch NGAS M8 NGAS R8 Sunshield Pathfinders (EPF/IVA) Observatory EM Test Bed (EMTB) NGAS M8 OTE Pathfinder Structure JSC 32GSFC SSDIF Pathfinder Optics Integration Pathfinder Cryo Optics Test NGAS M3 Propulsion Module I&T

ISIM will be tested in the GSFC SES chamber using an Optical Telescope Element Simulator (OSIM) SES chamber LN2 Shroud He shroud ISIM OSIM Vibration Isolation Supports OSIM Primary Mirror Alignment Diagnostic Module Fold Mirror 3 Tip/Tilt Gimbal Assembly GHe shroud instillation and test completed July 09

1/3 Scale Sunshield Test Complete - December 2009

Sunshield IVA Deployment Testing Kapton Spring Under Load

Stowed Sunshield IVA with the OTE Simulator

Flight Instrument Status Fully integrated and aligned NIRSpec Fully integrated MIRI FGS undergoing integration F187N – B NIRCam Flight hardware status