Prime Focus Spectrograph for Subaru Telescope Mechanical Design

Prime Focus Spectrograph for Subaru Telescope Mechanical Design October 14, 2011 Stephen Smee Mirek Golebiowski JHU/IDG 1

Agenda 2

Mechanical Design Requirements 3

Design Details – IR Camera 954. 51 mm [37. 58 in] 630 mm [24. 80 in] 667. 3 mm [26. 27 in] 675. 80 mm [26. 61 in] Weight Estimate = 214. 0 KG [471. 8 LBS] Vessel Material - Aluminum 6061 -T 6 4

Design Details – IR Camera Primary Opto-Mechanical Assembly Front Bell Assembly Front Ring w Hermetic Connectors (3 X) Viton O-Ring Rear Ring w Access Ports Rear Cover Assembly 5

Design Details – IR Camera Corrector #1 Front Bell Corrector #2 Detector Mount Detector Tripod Front Ring Composite Support Tube Radiation Shield Rear Tube Lower Shield Silver Straps (3 X) G 10 Shield Support Primary Silver Straps Thermal Strap Collar Rear Cover Cryocooler Valve 6

Design Details – Front Bell Assembly 154. 8 mm [6. 09 in] (3 X) Adjustable Alignment Pin Corrector Cell Assembly Viton O-Ring Corrector Cell Assembly Front Bell Precision Shoulder 7

Design Details – Corrector Cell Assembly Precision Shoulder Retainer, Corrector #1 Viton O-Ring Cell, Corrector #1 Corrector #2 430. 2 mm [16. 94 in] Corrector #1 Roll Pin Flexure Cell, Corrector #1 116. 3 mm [4. 58 in] Cell, Corrector #2 Retainer, Corrector #2 8

Design Details – Primary Opto-Mechanical Assembly 573. 0 mm [22. 56 in] Field Flattener Thermal Cu Collar 430. 2 mm [16. 94 in] Primary Mirror Shoulder Screw w Precision Compression Spring (2 X) Dowel Pin Alignment 70. 46 mm [2. 78 in] Collar Hub – Thermal Collar resides on hub during initial install of Primary Opto. Mechanical Assembly (3 X) Thermal straps from Radiation Shield to the Lower Shield. Install occurs via access ports in Rear Ring. 9

Design Details – Primary Opto-Mehcanical Assembly (3 X) Phytron Cryo Step Motor (VSS 32) Detector Tri-Pod Frame (Silicon Carbide) Primary Mirror Cell (Silicon Carbide) Support Tube, Tencate Advanced Composite (Kevlar-Cyanate-Ester) Radiation Shield, (1100 or 6063 Aluminum) Mounting Slot for Ease of Install 10

Design Details – Primary Mirror Cell (3 X) Mirror Retainer (INVAR 36) (2 X) Vertical Loading Spring Support (3 X) Trunnion Assembly Magnetic Plunger 11

Design Details – Primary Mirror Pad bonding to Mangin Schmidt Mirror using 3 M Scotch Weld Epoxy, #2216 or equivalent Pad material is INVAR 36 (3 X) Mounting Pad (Plug/Compression Spring Interface) Delrin Plug Precision Spring, Rate 14. 9 N/mm [85. 10 lb/in] +3. 0 N Set Screw +2. 8 N (4 X) Mounting Pad (Samarian-Cobalt Magnet Interface) +2. 8 N (2 X) Support Pad, Vertical Loading +48 N -1. 4 N Back Surface of Silica Mirror Magnet Plug Cell Sleeve, INVAR 36 12

Design Details – Primary Mirror Cell Piece Parts Trunnion Bearing Sleeve Pivot Pin Ball Bearing, ABEC-1, R 6 Extension Spring Set Screw Precision Spring SS, Rate 7. 70 N/mm [44 lbs/in] Set Screw Vertical Support Assy 13

Design Details – Rear Cover Assembly Rear Cover ION Pump Gauge Lower Shield Cryocooler Valve Lower Shield Support 14

Design Details – Visible Camera (Red & Blue) (3 X) Viton O-Ring Front Bell Assembly Front Ring w Hermetic Connectors Primary Opto-Mechanical Assembly Rear Ring w Access Ports Rear Cover Assembly 15

Design Details – Visible Camera Corrector #1 Front Bell Corrector #2 Detector Mount Radiation Shield Front Ring Composite Support Tube Detector Tripod Rear Tube Primary Lower Shield Silver Straps Thermal Strap Collar (3 X) G 10 Shield Support Rear Cover Valve Ion Pump Cryocooler 16

Design Details – Alignment Fixture Assembly 17

Design Details – Alignment Fixture Assembly 18

Design Details – Preamp Board / FEE Cabling 19

Design Details – Preamp Board / FEE Cabling NANO 31 & 37 Pin Surface Mounted to Front Bell NANO 65 Pin 3 Micro-D Connector Output, R/A Thru Hole (15, 25 and 37 pin) Preamp Board CCD Flex Cables FEE Board 20

Design Details – Preamp Board to CCD Flex Based on Hamamatsu design CCD 1 Flex Airborn NM-222 -065 -25 -TH 00 Custom 59 Position “Peel-A-Away” PGA Socket Assembly w Solder Preform – Advanced Interconnectins CCD 0 Flex 21

Design Details – Preamp Board to FEE Board Flex 22

Design Details – FEE Mounting Bracket 23

Analysis 24

Schedule 25

Risk Items 26

Back Up Data Design Graphics 27

Design Details – IR Camera 28

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