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Particles and Fields Package (PFP) Peer Instrument Critical Design Review SWIA Mechanical

Particles and Fields Package (PFP) Peer Instrument Critical Design Review SWIA Mechanical. Gregory Dalton Gregory Johnson UCB-SSL. SWIA Mechanical Overview. Assemblies and Features Materials Analyzer Construction Cover Release Mechanism Attenuator Construction MCP Construction

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Particles and Fields Package (PFP) Peer Instrument Critical Design Review SWIA Mechanical

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  1. Particles and Fields Package (PFP) Peer Instrument Critical Design Review SWIA Mechanical Gregory Dalton Gregory Johnson UCB-SSL

  2. SWIA Mechanical Overview Assemblies and Features Materials Analyzer Construction Cover Release Mechanism Attenuator Construction MCP Construction MOBI Motor Assembly Purge Construction Electronics Board Stackup Electronics Box Construction Mounting and Interconnects Analysis Outstanding Issues, ETU testing

  3. SWIA Status • Drawings – 100% complete • Fabrication – many parts complete, quotes out, parts in shop • All PDR FRA’s addressed • Testing – anode assembles, placed in calibration chamber

  4. SWIA Assemblies and Features Attenuator/ Cover Release Analyzer Anode Electronics PFDPU/S-C Connectors Mounting Feet

  5. SWIA Materials and Construction • Standard UCB Construction: • Machined/Etched Parts • 6061-T6 Aluminum • 2024-T8 Aluminum • 544 Bronze • 303 Stainless Steel • Delrin AF, PEEK 450G, VespelSP-1/3 • BeCu springs • Finshes • Alodine • Anodized • Gold Plating • Ebonol C, Black Chrome, DAG-213, Black ElectrolessNickel with Teflon • Thermal Treatments • Blankets (LM supplied) • Thermal Taping (LM supplied) • Long lead Items • MCP • Carbon Foils/Carriers • TiNi P5 Pin Pullers

  6. SWIA Analyzer Construction Cover Release/ Attenuator Cover in Closed Position Top Deflector Mount Top Deflector Outer Grids Aperture Ring Attenuator (down) Outer Hemisphere Bottom Deflector Bottom Deflector Mount Inner Hemisphere Hemisphere Mount Spider Plate

  7. Cover Release Mechanism • Burp Spring: • designed to relieve N2 at 5psi. • Holds cover closed during vibration TiNi P5 Pin Puller Inner Slide Spring Plunger Cover Open Burp Spring Safety Switch Retraction Spring Attenuator Latch Cover Closed Cover Seal

  8. Attenuator Cover Closed Cover Open Switch Cover Open, Attenuator Down Cover Stroke: 0.220” Aperture stroke: 0.225” Cover Open, Attenuator Up

  9. Attenuator Attenuator Down Switch Assembly SMA Routing Attenuator Up SMA Spring Block • Attenuator Design: • 2.17 N per SMA wire, redundant wires in both directions • 30g moving mass • 0.51 N switch spring force in detent to actuate attenuator (to hold in 1G environment) • 10x SMA force design margin • 25% SMA wire over travel Attenuator Slide Assembly

  10. SWIA MCP Construction Spring Clamps MCP Grid Grid Spacers Spring Rings Spring Plates MCP Rings MCPs MCP Supply Voltage Pin MCP Spacers Anode Transition Plate

  11. SWIA Purge Construction N2 1/8” NPT Cole Palmer compression fitting and right angle purge block. Viton O-Ring • 5psi N2 purge pressure

  12. SWIA Electronics Board Stackup LVPS Digital Deflector/ Sweep HV Supply Standoffs between boards and shields Preamplifier/MCP HV Supply MCP Protective Cover Anode

  13. SWIA Electronics Box Connections LVPS to PFDPU HV Enable on Pigtail HV to Deflectors Digital to PFDPU HV to Deflectors Lower Deflector HV Boards rigidly mounted to this panel Digital pigtails to MDM on Preamplifier Preamplifier Hypertronics KA-17 to Anode MCP HV Supply

  14. SWIA Mounting, Harness, and Purge N2 Purge Connection Harness Connectors

  15. SWIA Frequency Analysis • 243 Hz first mode of Upper Analyzer • 14% mass participation

  16. SWIA Stress Analysis • 101G static loading

  17. Cover Deflection and Load Radially constrained, 0.010” gap Burp Spring Plunger Cover Clamp

  18. SWIA Mass Budget • CBE mass based on a combination of: • Solid model with realistic mass properties • Measured SWIA prototype board mass • Measured mass of heritage parts and boards

  19. Future Plan • ETU Testing • Attenuator Life Test – End of June • Concurrent assembly of detector for Calibration Chamber Testing – End of June • N2 Purge Test • Exercise Manipulator • Vibration test for final frame design and structural verification with electronic mass dummies – Mid July • Issues • Black Nickel coating vendor • BeyondETU • Flight fabrication in August

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