Download - HiCIAO : High Contrast Instrument for next generation Adaptive Optics For Subaru 8.2m telescope
HiCIAO: High Contrast Instrument for next generation Adaptive Optics
For Subaru 8.2m telescope Based on a previous Japan/MEXT grant (Tokutei) PI & CoPIs: Motohide Tamura (NAOJ), Klaus
Hodapp (UH), Ryuji Suzuki (NAOJ; now TMT)Combined with the curvature-sensing AO with 188 elements (Hayano, Takami et al.) and SCExAO1024 upgrade (Guyon, Martinache et al.)Commissioned in 2009 (including Princeton/MPIA teams for angular differential imaging and commissioning)
Specifications and Performance 2048x2048 HgCdTe and ASIC readout Wavelengths: 1 – 2.5 microns (NIR) Observing modes: DI, PDI (dual beam), SDI (qua
d beam), & ADI; w/wo occulting masks (>=0.1")
Contrasts: 10^-6 at 1", 10^-4 at 0.15" (SDI)
Subaru/HiCIAO
Direct Imaging (DI) mode
Angular Differential Imaging (ADI) mode
20”
Polarization Differential Imaging (PDI) mode
10”
Spectral Differential Imaging (SDI) mode
5”
Observation modes of HiCIAO
Camera
Wollaston Prism
MovieByThalmann
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HiCIAO PDR Design
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HICIAO + Fore-Optics
Connectors are mounted on a large Sub-Plate to facilitate access to cables through the VJ
Main access to inside of Cryostat is via VJ Top Cover: Weight ~10 kg
HICIAO Fore-Optics;Mounts to AO-Bench
3 mm clearance between Fore-Optics and VJ
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3mm Gap betweenHICIAO VJ and Fore-Optics Assembly
AO-Bench Interface Plate (Subaru-design); to match up with holes on dowel pins to this face
Fore-Optics is decoupled from Vacuum Jacket!
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VJ Bottom Plate
V-Truss Assembly (Qty=4)
Starting point for HICIAO Assembly Sequence
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V-Truss Light Shield
Optics Bench
Brass Slides Qty=3
1) Brass Slides permit slight adjustments along the optical axis
2) For Assembly, use shims in places indicated
Cutouts for Detector Assembly
Note: Lip on the Optics Bench for Light-Seal
Place Shims here
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Common Path Filter Wheel Assembly (CPFW)
Shim Location
Install Light-Tube-1 to CPFW
Use .344 inch thick shim to locate CPFW to nominal position; place shim between Filter cover and inside of Optics Bench
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Pupil Wheel Assembly (PW)
Light-Tube-1
Install Light-Tube-2
Slide PW up flush against Light-Tube-1
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Detector Assembly
Add Detector Assembly: It must be installed prior to the Differential Path Filter Wheel (DPFW)
Prepare ASIC Flex Ribbon Cable as shown
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Tongue Light Shield
Light-Tube-2
To keep the Optics Path light tight, a Tongue & Groove design interface is used for the 2 marked parts; the Tongue Light Shield must be inserted before the DPFW
Bottom out against Light-Tube-2 prior to inserting DFPW
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Filter Wheel Case
DPFWOnce DPFW is installed, bottom out Tongue Light Shield on Filter Wheel Case and secure with 2 screws
Tongue Light Shield
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Assembly: Closed Cycle Cooler and 1st Stage Strap to Vacuum Jacket
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1st Stage Strap(compliant)
1st Stage Strap is composed of .12mm thick Copper Foils and bent into the configuration shown to cancel out vibrations from the 1050 CTI Cold Head
9x ¼-20 Socket Head Caps with Washer
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Clamp type design to secure the 1st Stage Strap to the Optics Bench; screws are located on the inside of the Optics Bench (previous slide)
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VJ Lower Body
Connectors and Connector Sub-Plates should be installed AFTER the VJ Lower Body has been bolted in place!
Evacuation Valve; Rotates through 360 Deg
Hex Socket Head M6 x 2525 Required
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Prepare Radiation Shield as shown in this slide; add to Assembly
S.H.C.Vented 6-32 x 5/8 32 Required
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Radiation Shield without Shield Top Plate
Note: This assembly state should be used to wire up the instrument
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Getter Shield attached to Radiation Shield Tube
CTI Cold Finger will slide through the inside of the Getter Shield
1st Stage Strap
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Closed Cycle Cooler Assembly
2nd Stage Getter Assembly
Vibration Isolation Mount
CCC Mount Flange
CTI 1050Cold Head
Cold Wire to Detector
Safety Finger Qty3
Prior to Vacuum, the CCC Cold Head is loose. After Vacuum is appliedCold Head is compressing the 2 Isolation Rings (Rubber);3 Safety Fingers limit the motion of the Cold Head with no Vacuum
1st Strap Access Cover
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Access Hole in CCCMount Flange; used to bolt 1st Stage Strap to CCC Cold Finger
1050 CTI Cooler assembled to Vacuum Jacket
Use these Screws to limit movement of CCC Cold Head when not under Vacuum; 3 Places
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Changing Filters;Lenses etc
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Access Covers to Filter/Lenses
Hall Sensor Mount
This and next slide show state of disassembly necessary to perform maintenance and change filters/sensors/lenses etc.
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View into open Cryostat: Entrance Window at Right
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HICIAO Installation on NASMYTH
1. After PDR, Fore-Optics and Vacuum Jacket became 2 independently mounted assemblies
2. Wollaston Prism is close to Vacuum Jacket for optical performance reasons
3. Must protect Wollaston Prism from possible collision with Vacuum Jacket upon installation
4. Next slides discuss new design for mounting procedure of Fore-Optics and Vacuum Jacket on Nasmyth Floor
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Front Back
Common Path Filter Wheel
For more Details: See PDR Document 3.2.2.3.6Cover shown partially transparent
Dowels lineup unit perpendicular to Optics Bench Mounting surface
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Mechanism Registration: Brass Slides permits parallel, limited translation along the optical axis
Filter Wheel Case Holder
Slotted Holes; allow limited adjustment along the optical axis
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Detent
Filter Wheel Cover removed
Geneva Wheel 12 positions
Cam & Driver Assembly
Hall Sensor
Magnets in Wheel
Filter Cell
Detent Spring
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Bearing Mount
PHYTRON CRYO-Motor
Filter Access Cover; held in place with leaf spring
Gear TrainRatio 8:1
Hall Sensor
M. Tamura (NAOJ),and
SEEDS/HiCIAO/AO team
M. Tamura (NAOJ),and
SEEDS/HiCIAO/AO team
Strategic Exploration of Exoplanets and Disks with Subaru (SEEDS)
Strategic Exploration of Exoplanets and Disks with Subaru (SEEDS)
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Linear Polarization Map of the T Tauri Star UX Tau BTaken with HiCIAO as part of SEEDS