configuration overview - nasadecember, 2000 wfc3 critical design review 2 "data contained...
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December, 2000 WFC3 Critical Design Review 1
WFC3 Critical Design Review
CONFIGURATION OVERVIEW
Jim Sneary
December, 2000 WFC3 Critical Design Review 2"Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure."
Description Outline
• Location within HST• System / Subsystems Layout• Post SRR Changes
December, 2000 WFC3 Critical Design Review 3"Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure."
Continuing The HST LegacyUltimate In-Service Replacement
WFC3 will replace WFPC2in the Aft Shroud -V3 axis
December, 2000 WFC3 Critical Design Review 4"Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure."
WFC3 Is A Hubble Space Telescope Radial Instrument
+V2NCS
Radiator
Bay 2 Bay 3
Bay 4
Bay 1
WFC3
STISCOS
ACS NICMOS
+V3
+V2
ESMNCC
FGS 2
FGS
3
FGS
1
WFC3
WFC3
HST
WFC3 utilizes theenclosure andradiator of theretrieved WF/PC 1
WFC3 will maintainthe same mechanicaland electrical interfacesas WFPC2
December, 2000 WFC3 Critical Design Review 5"Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure."
Numerous WF/PC 1 ComponentsAre Being Reused On WFC3
Main (Detector)Radiator
Mechanism Cover
Enclosure
Radiator TrussAssembly
B-Latch
A-Latch
GSE Pick-OffMirror Cover
Guiderails C-Latch(hidden)
WF/PC1 H/Wreuse items
GSE RotatingDolly
December, 2000 WFC3 Critical Design Review 6"Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure."
WFC3 Has SignificantSubsystem Heritage
Enclosure
Main (Detector)Radiator
Radiator TrussAssembly
WF/PC I H/W reuse
B-Latch
A-Latch
Blind Mate Connector
MechanismCover
LVPSMEB #2
DEB (under MEB)
MEB #1
CEB
Pick-OffMirror & Arm
Detector Heat Pipes
HST Heritage
ElectronicsRadiator
Optical Bench
New H/W
December, 2000 WFC3 Critical Design Review 7"Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure."
Electrical SubsystemSimplified Block Diagram
HST
Power
Command/
Housekeeping RIU
LVPS
Control
Section
Support
Electronics
Section
UVIS CEB
IR DEB
Housekeeping Data (thermistors) Calibration
Lamp ControllerMechanisms
(6)
Science Data
Formatter
ThermalControllers (4)& RadiatorTEC
1. Only one side shown2. Cross-strapping not shown3. Not shown: - RIU Expander Unit - SOFA Relay Box - Power Distribution Box
UVIS CCD TEC
IRFPA TEC
Filter Box
Filter Box
Cal Lamps
MEB
= redundant boxes
= redundant circuitryon the PWAs
December, 2000 WFC3 Critical Design Review 8"Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure."
CCDElectronicsBox (CEB)
MainElectronicsBox 1(MEB1)
Low VoltagePower Supply(LVPS) 1 & 2
SOFAElectronics
Bay 1
Bay 5
Bay 2
MainElectronicsBox 2 (MEB2)
Detector (IR)Electronics Box(DEB)
Heater PowerDistribution Box(HPDB)
ExternalRadiator
Calibration LampsController (CLC)
Blind MateConnector
Enclosure
Remote InterfaceUnit (RIU) 1 & 2 ;Extender Unit(EU) On back ofrear enclosurebulkhead and notshown here
Electronics Locations On WFC3
December, 2000 WFC3 Critical Design Review 9"Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure."
Wide Field Optical Diagram
UVIS Channel • FOV 160 X 160 arc sec• F/31• OTA + WFC3 focal length = 78,000 mm• 4k X 4k CCD, 15 mm pixels• 200 - 1000 nm
IR Channel
• FOV 123 X 139 arc sec• F/11• OTA + WFC3 focal length = 29,000 mm• 1k X 1k HgCdTe array, 18 mm pixels• 850 - 1700 nm
December, 2000 WFC3 Critical Design Review 10"Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure."
Highlights Of Post-SRR Changes
• Reflective IR optical configuration changed to a refractivesystem– Incorporation of a refractive corrector plate (RCP) and an optimized ‘co-located’ cold stop– Benefit is overall instrument throughput improvement from 61 to
85 %
• Both detector focal planes (UVIS and IR) are mounted at anangle to optic axis to account for off-axis opticalprescriptions
• Numerous packaging iterations for locations of mechanismsand electronics boxes.
• Down-selected to Marconi CCD for ;– Noise performance and considerations for coating / QE stability and
CTE
December, 2000 WFC3 Critical Design Review 11"Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure."
UVIS Channel Detector
• Format: 2 x 2Kx4K CCDs• Pixel size: 15 mm• Field of View: 160x160 arcsec• Bandpass: 200 to 1000 nm• Read Noise: < 4 e- rms• QE > 60% for 300 to 700 nm• Charge Transfer Efficiency: > 0.99999 (start of life)• Dark current: < 15 e-/pix/hr
Two per assembly
2k x 4k CCD
BasePlate
UpperRadiationShield
FocalPlane
CEBElectronics
Enclosure
Hardware from ACSWide Field Camera
December, 2000 WFC3 Critical Design Review 12"Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure."
Cover, thermal shieldand baseplate
Mounted FPAwith discretelead wires
6-stage TEC& ceramiccup withCu straps
5.5” dia.
IR Demo Hardware- Designed, Fabricated And Tested -
•Format: 1Kx1K HgCdTe/Silicon mux•Pixel size: 18 um •Field of View: 130x130 arcsec•Bandpass: 850 to 1700 nm
Filter WheelMechanism
ColdEnclosure
IR Detector Assy
Filters
One1 K x 1 K FPAper unit
December, 2000 WFC3 Critical Design Review 13"Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure."
Optical Assembly WithTop Panel Removed
SOFA (UVIS Filters)
WF/PC I H/W reuse
UVIS Detector
UVIS Shutter
Calibration Subsystem
IR Fold Mirror
IRM2 & CorrectorMechanism
Athermalized Strut System
UVM1 & CorrectorMechanism
IR Filter Wheel
Pickoff Mirror
HST Heritage
Channel SelectMechanism
IR Cold EnclosureRCP
IR Detector
Optical Bench
New H/W
December, 2000 WFC3 Critical Design Review 14"Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure."
WFC3 Thermal Configuration
UVIS FlexCCHPs (2)
MEB CCHPs(2) Internal(2) External
IR Cold Enclosure Flex CCHPs (2)
IR Detector Flex CCHPs (2)
Optical Bench Cold Platewith Integral CCHP (1)
External Radiator with ExternalSpreader CCHPs (6) and
Header CCHPs (2)
Optical Bench Cold PlateControl VCHP (1)
MEB CCHPs(2) Internal(2) External