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WIDE FIELD CAMERA 3 HOME PAGE: wfc3.gsfc.nasa

WIDE FIELD CAMERA 3 HOME PAGE: wfc3.gsfc.nasa.gov. UVIS Surrogate Detector. IR Filter Wheel. Flight SOFA. TIPS – June 27, 2002. STScI Highlights. STScI work Mini-Handbook completed (M. Giavalisco, ed.) and in SOC review/comment phase Ground system development on schedule

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WIDE FIELD CAMERA 3 HOME PAGE: wfc3.gsfc.nasa

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  1. WIDE FIELD CAMERA 3HOME PAGE: wfc3.gsfc.nasa.gov UVIS Surrogate Detector IR Filter Wheel Flight SOFA TIPS – June 27, 2002 WFC3 Monthly Status Review

  2. STScI Highlights • STScI work • Mini-Handbook completed (M. Giavalisco, ed.) and in SOC review/comment phase • Ground system development on schedule • UVIS and IR test images received last week from Ball • Good implications for test benches/simulators/FSW • Key element for maintaining STScI work flow • Close to starting timing tests on benches for ops software • Ongoing analysis and calibration • Stiavelli and Hartig ready to support encircled energy test • Robberto et al supporting detector characterization • Reid/Bartko/Kutina -- science ground cal plan • Lupie working filter issues WFC3 Monthly Status Review

  3. Instrument Assembly Highlights • Optics bench buildup at Ball on schedule for late August shipment to GSFC • IR/UVIS corrector mech and UVIS surrogate detector • SOFA received from Moog (flight qual complete) • IR surrogate ready for bench (IR qual has vacuum) • GSFC preparations • Enclosure buildup and testing on track • Stimulus assembled and getting ready for Therm Vac • VCHP thermal vac complete • Schedule metric value for May is 44% against the SM4 launch date of March 1, 2004 WFC3 Monthly Status Review

  4. Instrument Level I&T Flow at GSFCJamie Dunn Optical Assy Integration Complete Elec Integration Integrate Flight Detectors Start Elec Integ. on Flt Enclosure Match Mate Fit Check Performance Test EMI / EMC Test Magnetic Survey Mass Properties Metrology & WSIPE fit check Acoustic Test TB / TV and Calibration Crew Familiarizations WFC3 SMGT HFMS Fit Check Deliver to HST Ship to KSC Integrated SMGT Launch WFC3 Monthly Status Review

  5. Optical Assembly Integration ProgressMark Bergeland Selectable Optical Filter Assembly (EMU) UVIS Corrector Mechanism UVM1 UVIS Shutter Assembly Flight SOFA Channel Select Mech (CSM) UVIS Detector Assy Surrogate Alignment Cubes Deliver OA to GSFC Pickoff Mirror UVM2 03 10 17 24 OCT ‘01 05 12 19 26 DEC ‘01 31 7 14 21 28 FEB ‘02 04 11 18 25 APR ‘02 06 13 20 27 JUN ‘02 01 08 15 22 29 AUG ‘02 02 09 16 23 30 SEP ‘01 01 08 15 22 29 NOV ‘01 03 10 17 24 JAN ‘02 04 11 18 25 MAR ‘02 01 08 15 22 29 MAY ‘02 03 10 17 24 JUL ‘02 05 12 19 26 SEP ‘02 Calibration Subsystem Chief Ray Target Plate IRM2 IR Corrector Mechanism IRM1 IR Fold Mirror Optical Baffles and UVIS Post-Flash IR Cold Enclosure Assembly IR Detector Assembly Surrogate IR Filter Wheel Cold Enclosure Mini-Stimulus Alignment in WFAS Refractive Corrector Plate (RCP) Optical Bench in WFAS WFC3 Monthly Status Review

  6. IR Filter Wheel Populated Blank F160W F164N F125W F167N G141 F126N F110W F132N F105W F130N F098W F128N G102 F127M F093M F139M F153M WFC3 Monthly Status Review

  7. Detectors Continue To Progress Well Through Assembly Flight UVIS-2 • Began base • disc assembly Flight UVIS-1 • Completed base disc assembly • Sealed base disc assembly to • external ring assembly WFC3 Monthly Status Review

  8. IR Detector Hardware Surrogate assy integration is nearly complete Qual assy after vacuum acquisition and pinchoff WFC3 Monthly Status Review

  9. IRM2 Alignment Fixture and Bench Installation View From IR Detector Alignment Fixture Reticle Mirror Corrector Mechanism Mechanism Side View Alignment Fixture Z Reference Tooling Ball WFC3 Monthly Status Review

  10. Completed VCHP Performance Thermal Vacuum Test Main Radiator Simulator VCHP and Reservoir VCHP/CCHP Interface Optical Bench Cold Plate WFC3 Monthly Status Review

  11. CASTLE Integrated to the RIAF STEERING MIRROR ASSEMBLY OFF-LOAD FIXTURE BALANCE WEIGHTS CASTLE TELESCOPE CATHETOMETER POINT TARGET ASSEMBLY RIAF ELECTRICAL CABLES ISOLATION CRADLE WFC3 Monthly Status Review

  12. Problem Areas • Electronics Boxes behind • Parts shortages being worked; GSFC assuming some • IR detector performance • HST Project has agreed to Lot 7 at Rockwell • Installing IR#32 (low QE part into Build 1) • TECFIRE • Redesign complete with review on 1 July • Uses 18 (originally 3) TECs with conductive felt (GELVET) • Possible problem with pinholes in UV filters • Being assessed but may require in-situ painting WFC3 Monthly Status Review

  13. GSFC and Ball Are Splitting The Remaining Electronics EffortBob Parizek = redundant boxes Thermal Controllers (4) & Radiator TEC LVPS Filter Box Power HST Filter Box Command/ UVIS Detector Housekeeping RIU UVIS CEB Control Science Data Section Formatter IR DEB IR Detector 1. Only one side shown 2. Cross-strapping not shown 3. Not shown: - RIU Expander Unit - Heater Power Distribution Box Support Electronics MEB Optical Assy CSM Correctors (2) IR Filter Wheel UVIS Shutter SOFA Cal Lamps Section Housekeeping Data (Thermistors) = redundant circuitry on the PWAs Calibration Lamp Controller SOFA Relay Responsibility color code: Ball Delivers Tested Unit GFE Ball Delivers Functional Unit GSFC Builds/Tests Ball Design WFC3 Monthly Status Review

  14. IR Detector Status • In May, IPT and SOC believed that Lot 6 parts were acceptable • QE problem solved but noise still high • Subsequent DCL testing shows very poor stability over many hours • Ball overheated IR FPA#50 (50C limit; reached ~75C) • Science IPT and SOC selected FPA #32 is the best device for IR Build 1, due to the uncertainty in our ability to calibrate a device like FPA #50 • We have 3 other Lot 6 parts (only 1 other part similar to #32) • A second full process review at Ball week of July 8 or 15 • IR FPA Lot 7 starting at Rockwell Scientific • Well understood why Lot 6 QE much improved • Good reason advanced why #32&#34 have much better stability • These involve separate process steps physically well separated in detector • Expect delivery to DCL in October and to Ball in early January • Has schedule implications for thermal vac and ground calibration WFC3 Monthly Status Review

  15. IR Detector QE WFC3 Monthly Status Review

  16. TECFIRECornelis de Kramer Original (Soldered) New (Solderless) WFC3 Monthly Status Review

  17. Original Design With Solder Interfaces To TECs Radiator Heat Pipes TECs Soldered Interfaces WFC3 Monthly Status Review

  18. Spreader/U HP IR Detector Flex HP Condenser Saddle Non-Loaded TEC Configuration With GELVETÒ Interface to Radiator HP (Aluminum or Copper?) Bevel Washers (8x) Interface to Flex Pipe (Aluminum) TEC Housing w/ Flexures (titanium) WFC3 Monthly Status Review

  19. UVIS-UV Filter Construction Thin Aluminum type coatings used in some UV filters are highly susceptible to pinholes Thin Aluminum coating Single substrate filter – UVIS 03 (F275W), Pinholes found before and after installation in filter wheel and thermal vacuum cycles at Moog. Dual substrate filter with gap – UVIS 15(F300X). Pinholes were found by Barr in UVIS 1,2,and 15 and ‘painted’ over. WFC3 Monthly Status Review

  20. UV Filters Transmission Curve UVIS 03 (F275W) UVIS 15 (F300X) WFC3 Monthly Status Review

  21. Pinhole Assessment Ongoing WFC3 Monthly Status Review

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