5 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
6 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!
8 VJ Bottom Plate V-Truss Assembly (Qty=4) Starting point for HICIAO Assembly Sequence
9 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
10 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
11 Pupil Wheel Assembly (PW) Light-Tube-1 Install Light-Tube-2 Slide PW up flush against Light- Tube-1
12 Detector Assembly Add Detector Assembly: It must be installed prior to the Differential Path Filter Wheel (DPFW) Prepare ASIC Flex Ribbon Cable as shown
13 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
14 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
15 Assembly: Closed Cycle Cooler and 1 st Stage Strap to Vacuum Jacket
16 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 ¼-20 Socket Head Caps with Washer
17 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)
18 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
19 Prepare Radiation Shield as shown in this slide; add to Assembly S.H.C.Vented 6-32 x 5/8 32 Required
20 Radiation Shield without Shield Top Plate Note: This assembly state should be used to wire up the instrument
21 Getter Shield attached to Radiation Shield Tube CTI Cold Finger will slide through the inside of the Getter Shield 1 st Stage Strap
22 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
23 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
25 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.
26 View into open Cryostat: Entrance Window at Right
27 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
28 HiCIAO Nasmyth Interface Preliminary Proposal Hideki Takami, Michael Eldred February 8, 2006
29 Instrument Layout IRCS at AO focus Laser Room AO IRCS CISCO
30 Instrument Layout IRCS and AO at docking station Laser Room IRCS AO
31 Instrument Layout HiCIAO at AO focus 4 fixed points for IRCS Laser Room AO IRCS HiCIAO
32 Instrument Layout IRCS at AO focus Laser Room AO IRCS HiCIAO
33 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.
35 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.
36 Register Pin Qty=2; Attached to VJ Front End Stop Plate Interlocking Pin Qty=2 Press fitted to VJ Bottom Plate VJ Bottom Plate omitted Hand Crank
37 Register Pin; bolted to VJ Bottom Plate; electrically insulated from VJ Interlocking Pin Repositioning Hardware required on Vacuum Jacket
38 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.
39 V-Groove Rectangular Slot Arrangement assures repeat positioning of VJ on Interface Structure Interlock Pin Qty=2
40 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
41 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
42 Front Back Common Path Filter Wheel For more Details: See PDR Document 188.8.131.52.6Cover shown partially transparent Dowels lineup unit perpendicular to Optics Bench Mounting surface
43 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
44 Detent Filter Wheel Cover removed Geneva Wheel 12 positions Cam & Driver Assembly Hall Sensor Magnets in Wheel Filter Cell Detent Spring
45 Bearing Mount PHYTRON CRYO-Motor Filter Access Cover; held in place with leaf spring Gear Train Ratio 8:1 Hall Sensor
46 Detector Focus Mechanism Maximum Travel Range: +/- 8 mm Resolution: 5 micron Drive System: Linear Ball Bushings with Ball Screw Drive Encoding: Hall Sensor & Magnet
47 Front View Back View Detector and Detector Focus Stage Resolution: 5 micron Drive: Linear Ball Slides w/Ball Screw Drive
48 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