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")
Contrasts: 10^-6 at 1", 10^-4 at 0.15" (SDI)
Observation modes of HiCIAO
Direct Imaging (DI) mode
Polarization Differential Imaging (PDI)
mode
Camera
10”
20”
Wollaston Prism
Spectral Differential Imaging (SDI) mode
5”
Angular Differential Imaging (ADI) mode
Movie
By
Thalmann
HiCIAO PDR Design
3
HICIAO + Fore-Optics
Main access to inside of Cryostat is
via VJ Top Cover: Weight ~10 kg
HICIAO Fore-Optics;
Mounts to AO-Bench
Connectors are mounted on a
large Sub-Plate to facilitate
access to cables through the
VJ
3 mm clearance between
Fore-Optics and VJ
4
AO-Bench Interface Plate (Subarudesign); to match up with holes on
dowel pins to this face
Fore-Optics is decoupled from Vacuum Jacket!
3mm Gap between
HICIAO VJ and Fore-Optics Assembly
5
6
Starting point for HICIAO Assembly Sequence
V-Truss Assembly
(Qty=4)
VJ Bottom Plate
7
Note: Lip on the
Optics Bench for
Light-Seal
V-Truss Light Shield
Brass Slides Qty=3
Optics Bench
1)
2)
Brass Slides permit slight
adjustments along the optical
axis
For Assembly, use shims in
places indicated
Cutouts for
Detector
Assembly
Place Shims here
8
Shim
Location
Common Path Filter Wheel Assembly
(CPFW)
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
9
Pupil Wheel Assembly (PW)
Slide PW up flush against LightTube-1
Light-Tube-1
Install Light-Tube-2
10
Add Detector Assembly: It must be
installed prior to the Differential Path Filter
Wheel (DPFW)
Detector Assembly
Prepare ASIC Flex
Ribbon Cable as shown
11
Light-Tube-2
Tongue Light Shield
Bottom out against
Light-Tube-2 prior
to inserting DFPW
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
12
Filter Wheel Case
Once DPFW is installed,
bottom out Tongue Light
Shield on Filter Wheel Case
and secure with 2 screws
Tongue Light Shield
DPFW
13
Assembly: Closed Cycle Cooler and 1st
Stage Strap to Vacuum Jacket
14
9x ¼-20 Socket Head
Caps with Washer
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
15
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)
16
VJ Lower Body
Hex Socket
Head M6 x 25
25 Required
Connectors and Connector Sub-Plates
should be installed AFTER the VJ
Lower Body has been bolted in place!
Evacuation Valve; Rotates
through 360 Deg
17
Prepare Radiation
Shield as shown in this
slide; add to Assembly
S.H.C.Vented 6-32 x
5/8 32 Required
18
Radiation Shield
without Shield
Top Plate
Note: This assembly state should
be used to wire up the instrument
19
CTI Cold Finger will slide through the
inside of the Getter Shield
Getter Shield attached to
Radiation Shield Tube
1st Stage Strap
20
Vibration Isolation Mount
Closed Cycle Cooler Assembly
1st Strap Access Cover
2nd Stage Getter Assembly
CTI 1050
Cold Head
Safety Finger Qty3
Cold Wire to Detector
CCC Mount Flange
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
21
1050 CTI Cooler assembled to Vacuum Jacket
Use these Screws to
limit movement of
CCC Cold Head
when not under
Vacuum; 3 Places
Access Hole in CCC
Mount Flange; used to
bolt 1st Stage Strap to
CCC Cold Finger
22
Changing Filters;Lenses etc
23
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.
24
View into open
Cryostat: Entrance
Window at Right
25
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
26
Common Path Filter Wheel
Front
Back
Dowels lineup unit
perpendicular to
Optics Bench
Mounting surface
Cover shown partially transparent
For more Details: See PDR Document 3.2.2.3.6
27
Filter Wheel Case Holder
Mechanism Registration:
Brass Slides permits parallel,
limited translation along the
optical axis
Slotted Holes;
allow limited
adjustment along
the optical axis
28
Filter Wheel Cover removed
Magnets in Wheel
Detent Spring
Detent
Cam & Driver Assembly
Hall Sensor
Geneva Wheel 12
positions
Filter Cell
29
Filter Access Cover; held in place
with leaf spring
PHYTRON CRYO-Motor
Hall Sensor
Gear Train
Ratio 8:1
Bearing Mount
30
Strategic Exploration of
Exoplanets and Disks
with Subaru (SEEDS)
M. Tamura (NAOJ),
and
SEEDS/HiCIAO/AO team
Linear Polarization Map of the T Tauri Star UX Tau B
Taken with HiCIAO as part of SEEDS
32