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HICIAO-Assembly-Procedure
Prepared for HICIAO CDRAuthor: Vern StahlbergerInstitute for AstronomyDate: 01-30-06
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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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HiCIAO Nasmyth InterfacePreliminary Proposal
Hideki Takami, Michael EldredFebruary 8, 2006
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Instrument LayoutIRCS at AO focus
Laser RoomAO
IRCS
CISCO
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Instrument LayoutIRCS and AO at docking station
Laser Room
IRCS
AO
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Instrument LayoutHiCIAO at AO focus
4 fixed pointsfor IRCS
Laser RoomAO
IRCSHiCIAO
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Instrument LayoutIRCS at AO focus
Laser RoomAO
IRCS
HiCIAO
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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.
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VJ Bottom Plate
Interlocking Pin: Qty=2
Foot Focus Adjustment Qty=4
Side Adjust Bracket Qty=4
Z-Shim Qty=4
Opt-Axis Adjust Rail Qty=2
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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.
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Register Pin Qty=2;Attached to VJ
Front End Stop Plate
Interlocking Pin Qty=2Press fitted to VJ Bottom Plate VJ Bottom Plate omitted
Hand Crank
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Register Pin; bolted to VJ Bottom Plate; electrically insulated from VJInterlocking Pin
Repositioning Hardware required on Vacuum Jacket
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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.
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V-Groove
Rectangular Slot
Arrangement assures repeat positioning of VJ on Interface Structure
Interlock Pin Qty=2
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Target Assembly Qty=4
HICIAO will either use its own Target Assemblies or use IRCS Target Assemblies. (no final decision yet)
HICIAO mounted to Instrument Structure
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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
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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
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Detector Focus Mechanism
Maximum Travel Range: +/- 8 mmResolution: 5 micronDrive System: Linear Ball Bushings with
Ball Screw DriveEncoding: Hall Sensor & Magnet
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Front View Back View
Detector and Detector Focus Stage
Resolution: 5 micronDrive: Linear Ball Slides w/Ball Screw Drive
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ASIC (Schematic only)
Ball Screw Drive 1mm Pitch
Hall Sensor Substrate
THK Linear Ball Slides
Cold Feed-Through with G-10 Disk thermal insulation
Hall Sensor Substrate
Flex Connection
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G-10 Isolation Tabs Qty=4 Ball-Screw Bracket
PHYTRON CRYO-Motor