Slide 1

=0.1" ) Contrasts: 10^-6 at 1", 10^-4 at 0.15" (SDI) Subaru/HiCIAO"> 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 (quad beam), & ADI; w/wo occulting masks (>=0.1" ) Observing modes: DI, PDI (dual beam), SDI (quad beam), & ADI; w/wo occulting masks (>=0.1" ) Contrasts: 10^-6 at 1", 10^-4 at 0.15" (SDI) Subaru/HiCIAO Slide 2 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 Movie By Thalmann Slide 3 3 HiCIAO PDR Design Slide 4 4 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 Slide 5 5 3mm Gap between HICIAO 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! Slide 6 6 Slide 7 7 VJ Bottom Plate V-Truss Assembly (Qty=4) Starting point for HICIAO Assembly Sequence Slide 8 8 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 Slide 9 9 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 Slide 10 10 Pupil Wheel Assembly (PW) Light-Tube-1 Install Light-Tube-2 Slide PW up flush against Light- Tube-1 Slide 11 11 Detector Assembly Add Detector Assembly: It must be installed prior to the Differential Path Filter Wheel (DPFW) Prepare ASIC Flex Ribbon Cable as shown Slide 12 12 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 Slide 13 13 Filter Wheel Case DPFW Once DPFW is installed, bottom out Tongue Light Shield on Filter Wheel Case and secure with 2 screws Tongue Light Shield Slide 14 14 Assembly: Closed Cycle Cooler and 1 st Stage Strap to Vacuum Jacket Slide 15 15 1 st Stage Strap (compliant) 1 st 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 -20 Socket Head Caps with Washer Slide 16 16 Clamp type design to secure the 1 st Stage Strap to the Optics Bench; screws are located on the inside of the Optics Bench (previous slide) Slide 17 17 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 25 25 Required Slide 18 18 Prepare Radiation Shield as shown in this slide; add to Assembly S.H.C.Vented 6-32 x 5/8 32 Required Slide 19 19 Radiation Shield without Shield Top Plate Note: This assembly state should be used to wire up the instrument Slide 20 20 Getter Shield attached to Radiation Shield Tube CTI Cold Finger will slide through the inside of the Getter Shield 1 st Stage Strap Slide 21 21 Closed Cycle Cooler Assembly 2 nd Stage Getter Assembly Vibration Isolation Mount CCC Mount Flange CTI 1050 Cold Head Cold Wire to Detector Safety Finger Qty3 Prior to Vacuum, the CCC Cold Head is loose. After Vacuum is applied Cold Head is compressing the 2 Isolation Rings (Rubber); 3 Safety Fingers limit the motion of the Cold Head with no Vacuum 1 st Strap Access Cover Slide 22 22 Access Hole in CCC Mount Flange; used to bolt 1 st 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 Slide 23 23 Changing Filters;Lenses etc Slide 24 24 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. Slide 25 25 View into open Cryostat: Entrance Window at Right Slide 26 26 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 Slide 27 27 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 Slide 28 28 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 Slide 29 29 Detent Filter Wheel Cover removed Geneva Wheel 12 positions Cam & Driver Assembly Hall Sensor Magnets in Wheel Filter Cell Detent Spring Slide 30 30 Bearing Mount PHYTRON CRYO-Motor Filter Access Cover; held in place with leaf spring Gear Train Ratio 8:1 Hall Sensor Slide 31 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) Slide 32 32 Linear Polarization Map of the T Tauri Star UX Tau B Taken with HiCIAO as part of SEEDS