HICIAO-Assembly-Procedure
Prepared for HICIAO CDR
Author: Vern Stahlberger
Institute for Astronomy
Date: 01-30-06
1
HiCIAO PDR Design
2
3
4
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
5
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
6
7
Starting point for HICIAO Assembly Sequence
V-Truss Assembly
(Qty=4)
VJ Bottom Plate
8
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
9
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
10
Pupil Wheel Assembly (PW)
Slide PW up flush against LightTube-1
Light-Tube-1
Install Light-Tube-2
11
Add Detector Assembly: It must be
installed prior to the Differential Path Filter
Wheel (DPFW)
Detector Assembly
Prepare ASIC Flex
Ribbon Cable as shown
12
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
13
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
14
Assembly: Closed Cycle Cooler and 1st
Stage Strap to Vacuum Jacket
15
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
16
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)
17
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
18
Prepare Radiation
Shield as shown in this
slide; add to Assembly
S.H.C.Vented 6-32 x
5/8 32 Required
19
Radiation Shield
without Shield
Top Plate
Note: This assembly state should
be used to wire up the instrument
20
CTI Cold Finger will slide through the
inside of the Getter Shield
Getter Shield attached to
Radiation Shield Tube
1st Stage Strap
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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
22
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
23
Changing Filters;Lenses etc
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.
25
View into open
Cryostat: Entrance
Window at Right
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
27
HiCIAO Nasmyth Interface
Preliminary Proposal
Hideki Takami, Michael Eldred
February 8, 2006
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Instrument
Layout
IRCS at AO focus
CISCO
IRCS
Laser Room
AO
29
Instrument
Layout
IRCS and AO at docking station
IRCS
Laser Room
AO
30
Instrument
Layout
HiCIAO at AO focus
4 fixed points
for IRCS
HiCIAO
IRCS
Laser Room
AO
31
Instrument
Layout
IRCS at AO focus
HiCIAO
IRCS
Laser Room
AO
32
Brief Overview of Installation Procedure
1) Install the Fore-Optics Assembly to the AO-Interface
Plate mounted to AO-Bench
2) Transport HICIAO VJ and Interface Frame to the site
either by Crane of Rail ( Subaru’s decision)
3) HICIAO VJ must be in the retracted position!
4) Move HICIAO to observing position using crank
The following slides will explain in detail the procedure,
including initial setup and alignment.
33
Interlocking Pin: Qty=2
Side Adjust Bracket Qty=4
VJ Bottom Plate
Opt-Axis Adjust Rail Qty=2
Foot Focus Adjustment Qty=4
Z-Shim Qty=4
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Comments on previous slide:
1)
The Side Adjust Brackets are used for the initial alignment; once set, they will
remain locked.
2)
The Z-Shim likewise will be adjusted during initial setup; once the optical axes has
been aligned, no further adjustments are needed; at this point the Opt-Axis Adjust
Rails are secured with bolts through the Z-Shims into the Interface Structure (Bolts
not shown)
3)
The horizontal slots in the Foot Focus Adjustment are used for fine-tuning the focus
direction of the HICIAO instrument.
4)
ONCE THE INITIAL SETUP IS COMPLETED, THE HICIAO INSTRUMENT
CAN SIMPLY BE RETRACTED BEFORE AND AFTER INSTALLATION BY
MEANS OF THE CRANK ON THE RIGHT.
5)
The Interlocking Pins require the Vacuum Jacket to be moved horizontally away
from the Fore-Optics for the first inch or so.
6)
There is also a design feature to allow for precise, repeat positioning of the Vacuum
Jacket w.r.t. Interface Structure. This is shown in the next slides.
35
Interlocking Pin Qty=2
Press fitted to VJ Bottom Plate
VJ Bottom Plate omitted
Hand Crank
Register Pin Qty=2;
Attached to VJ
Front End Stop Plate
36
Repositioning Hardware required on Vacuum Jacket
Register Pin; bolted
to VJ Bottom Plate;
electrically
insulated from VJ
Interlocking Pin
37
INITIAL SETUP: (with VJ sitting on Target Assemblies)
•
Adjust Front End Stop Plate such that the optical beam coming from the AO is parallel
to the optical axis of Cryostat. Front End Stop Plate has rotational adjustment around a
vector perpendicular to the Nasmyth Floor.
•
Adjust the Z-Shims to align the optical axis of the AO beam and Cryostat in the
direction perpendicular to the Nasmyth Floor. ( Step 1 and Step 2 can be reversed)
•
Move the Cryostat sidewise using the Side Adjust Brackets until the optical axis of the
AO and the Cryostat coincide. Secure bolts that fasten the Opt-Axis Adjust Rails to the
Instrument Frame.
•
Fine tune any Focus errors by using the horizontal slots in the Foot Focus Adjustment.
a)
The Register Pins are bolted to the bottom of the VJ Bottom Plate (previous slide)
b)
Both the Register Pins and Front End Stop Plate have hardened surfaces where they
match. The match on the near side is between the Register Pin and a V-Groove in the
Front End Stop Plate, at the far side between the Register Pin and a rectangular slot (see
next slide). This will insure accurate repeat positioning in x and y.
c)
Interlocking Pins and corresponding holes in the Fore-Optics Structure have enough
clearance between them to never touch. The Interlocking Pins serve as a safety feature in
that the cryostat cannot be moved in any other direction than horizontally away from the
Fore-Optics Assembly for the first inch.
38
Arrangement assures repeat
positioning of VJ on
Interface Structure
Rectangular Slot
Interlock Pin Qty=2
V-Groove
39
HICIAO mounted to Instrument Structure
HICIAO will either use its own Target
Assemblies or use IRCS Target
Assemblies. (no final decision yet)
Target Assembly Qty=4
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CRYO-MECHANISMS
HICIAO uses 4 CRYO-Mechanisms
Common Path Filter Wheel (CPFW)
Pupil Wheel (PW)
Differential Path Filter Wheel (DPFW)
Detector Focus Mechanism
Except for the Wheels, the CPFW, PW and
DPFW are identical in design
41
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
42
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
43
Filter Wheel Cover removed
Magnets in Wheel
Detent Spring
Detent
Cam & Driver Assembly
Hall Sensor
Geneva Wheel 12
positions
Filter Cell
44
Filter Access Cover; held in place
with leaf spring
PHYTRON CRYO-Motor
Hall Sensor
Gear Train
Ratio 8:1
Bearing Mount
45
Detector Focus Mechanism
Maximum Travel Range: +/- 8 mm
Resolution: 5 micron
Drive System: Linear Ball Bushings with Ball
Screw Drive
Encoding: Hall Sensor & Magnet
46
Detector and Detector Focus Stage
Resolution: 5 micron
Drive: Linear Ball Slides w/Ball Screw
Drive
Front View
Back View
47
ASIC (Schematic only)
Hall Sensor Substrate
Hall Sensor Substrate
Cold Feed-Through
with G-10 Disk
thermal insulation
Ball Screw Drive
1mm Pitch
THK Linear Ball Slides
Flex Connection
48
PHYTRON CRYO-Motor
G-10 Isolation Tabs
Qty=4
Ball-Screw Bracket
49