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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