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