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CMB-S4 and TMA Camera Design Comparisons: Overview and Pros/Cons for Installation

This overview compares the CMB-S4 and TMA camera designs, including size comparisons, outer lens layouts, front plate analyses, shield assemblies, and installation procedures. The text discusses the hex camera module overview, shield and detector module assemblies, cooling weldments, and serviceability aspects. Pros and cons of the hex camera design, such as modularity and ease of service, are weighed against challenges like limited access for cryogenics and heavier design compared to CMB-S4.

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CMB-S4 and TMA Camera Design Comparisons: Overview and Pros/Cons for Installation

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  1. Don Mitchell 30 SEP 2019 CMB-S4 and Hex CameraDesign Comparisons

  2. Overview – Hex Camera Shown Don Mitchell | CMB-S4 and TMA Design Comparisons

  3. Overview CMB-S4 Shown Don Mitchell | CMB-S4 and TMA Design Comparisons

  4. Overview – Size Comparison CMB-S4 ~10,000 Lbs 85 Detector modules Hex Camera ~16,000 Lbs 133 Detector modules Don Mitchell | CMB-S4 and TMA Design Comparisons

  5. Overview – Size Comparison Both systems use the same detector module design Don Mitchell | CMB-S4 and TMA Design Comparisons

  6. Typical Outer Lens Layout on Front Plate Don Mitchell | CMB-S4 and TMA Design Comparisons

  7. Outer Lens / Clamp Design Don Mitchell | CMB-S4 and TMA Design Comparisons

  8. Outer Lens / Clamp Design Don Mitchell | CMB-S4 and TMA Design Comparisons

  9. Outer Lens Clamp • Aligns on center of mounting hole • Curved features auto-center each window • Bottoms out when fully in position • Rubber pads prevent over-stressing window Don Mitchell | CMB-S4 and TMA Design Comparisons

  10. Hex Camera Module Overview 50k 4k 1k 100mk Don Mitchell | CMB-S4 and TMA Design Comparisons

  11. 12.7 mm thick plates: 100 MPa < 138 Mpa(allowable) Don Mitchell | CMB-S4 and TMA Design Comparisons

  12. Hex Front Plate: FE Analysis Summary 31.75 mm thick front plate111.38MPa < 138 MPa Don Mitchell | CMB-S4 and TMA Design Comparisons

  13. Overview: CMB-S4 Don Mitchell | CMB-S4 and TMA Design Comparisons

  14. CMB-S4 Front Plate: FE Analysis Summary • 3” thick plate • 3/4” between ports • 137 MPa, 2.77 mm Quarter Symmetry Don Mitchell | CMB-S4 and TMA Design Comparisons

  15. 300k Vessel Assembly • Front Plate: 2,882 lbs • Central Vessel: 3,779 lbs • Rear Plate: 1,450 lbs • Vessel total weight: 8,111 lbs Don Mitchell | CMB-S4 and TMA Design Comparisons

  16. 50k Shield Assembly • Estimated weight of the 50k shield made of aluminum is 315 lbs. Don Mitchell | CMB-S4 and TMA Design Comparisons

  17. 4k Shield Assembly • Estimated weight of the 4k assembly made of aluminum is 365 lbs. • Estimated weight of 85 lens on 4k plate is 67 lbs (material of lens considered is silicon). Don Mitchell | CMB-S4 and TMA Design Comparisons

  18. 1k Shield and Rear Detector Assembly • Estimated weight of the 1k plate, 1k shield and 85 focal plane Cone made of aluminum is 352.4 lbs. • Estimated weight of rest of material connected to 1k plate (lyot, lens, carbon fiber rod) is 80 lbs. Don Mitchell | CMB-S4 and TMA Design Comparisons

  19. 100 mK Cooling Bar Weldment • Estimated weight of the 100mk copper weldment is 180 lbs. Don Mitchell | CMB-S4 and TMA Design Comparisons

  20. Miscellaneous • G10 plates • Carbon Fiber Rods • Electronics • Cables • etc. Don Mitchell | CMB-S4 and TMA Design Comparisons

  21. Serviceability • With the rear plate and rear shields removed, each detector module can be easily removed and serviced. • Cable connections and 100mk heat sinks are accessible. Don Mitchell | CMB-S4 and TMA Design Comparisons

  22. Installation 50k shield shown installed – supported by 300k vessel with G10 support posts. Don Mitchell | CMB-S4 and TMA Design Comparisons

  23. Installation Begin constructing the coldmass.1k shield plate with cable and 100mk connection hardware. Don Mitchell | CMB-S4 and TMA Design Comparisons

  24. Installation Install detector modules Don Mitchell | CMB-S4 and TMA Design Comparisons

  25. Installation 1k shield shown with detector modules installed. Don Mitchell | CMB-S4 and TMA Design Comparisons

  26. Installation Install the 100mk cooling weldment – shown. Also install cables – not shown. Don Mitchell | CMB-S4 and TMA Design Comparisons

  27. Installation Install the 1k cover plate and carbon fiber connecting rods. – Rods used to connect 1k assembly to 4k plate. Don Mitchell | CMB-S4 and TMA Design Comparisons

  28. Installation Attach 1k assembly to 4k plate. Don Mitchell | CMB-S4 and TMA Design Comparisons

  29. Installation Install 4k side and rear shields. Don Mitchell | CMB-S4 and TMA Design Comparisons

  30. Installation • Install coldmass into the vessel – supported by G10 connecting plates • Install cooling straps • Connect all cables Don Mitchell | CMB-S4 and TMA Design Comparisons

  31. Installation Install front and rear plate assemblies. Don Mitchell | CMB-S4 and TMA Design Comparisons

  32. Various section views Don Mitchell | CMB-S4 and TMA Design Comparisons

  33. Various section views Don Mitchell | CMB-S4 and TMA Design Comparisons

  34. Pros and Cons: Hex Camera Design Pros: • Modular, pull entire module to service and swap-out • Easier shipping to remote site Cons: • Loss of tight packing factor between modules • All services must be rear-mounted • Access for cryogenics is very limited • Tight installation of heat shields – multiple shields (7 sets) • Larger cryogenic loads with multiple losses to 300k • Complicated design to fit all components – very tight! • Overall heavier design than CMB-S4 Don Mitchell | CMB-S4 and TMA Design Comparisons

  35. Pros and Cons: CMB-S4 Design Pros: • One assembly – lighter than hex camera design • Ease of serviceability from rear access • External vessel faces are accessible for mounting cryogenic, electronic, and alignment systems • Room for heat shields, cables, etc. • Good Packing factor • Compact design with fewer losses to 300k - less cooling Cons: • Large, singular assembly to handle • Mounted Cryocoolers and Dil-Fridge have limited angular operating positions Don Mitchell | CMB-S4 and TMA Design Comparisons

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