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

Particles and Fields Package (PFP) Peer Instrument Critical Design Review STATIC Mechanical. Gregory Dalton Gregory Johnson UCB-SSL. STATIC Mechanical Overview. Assemblies and Features Materials Analyzer Construction Attenuator Construction Time of Flight Section MCP Construction

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

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

  2. STATIC Mechanical Overview Assemblies and Features Materials Analyzer Construction Attenuator Construction Time of Flight Section MCP Construction Purge Construction HV Tower Electronics Board Stackup Electronics Box Construction Mounting and Interconnects Analysis Mass Future testing

  3. STATIC Status • Drawings – 100% complete • Fabrication – in process • Testing – Preliminary Acoustics, Vibration on TOF and Electronics Box • All PDR RFA’s addressed

  4. STATIC Assemblies and Features Attenuator/ Cover Release Analyzer HV Tower Time of Flight Anode/MCP Electronics Connector Access Panel PFDPU/S-C Connectors Mounting Feet

  5. STATIC 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 (high voltage isolation materials) • BeCu springs • Finishes • 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 • TiNiP5 Pin Pullers

  6. STATIC Analyzer Construction Attenuator Mechanism Release Housing Upper Deflector Mount Cover Release Mechanism Attenuator Deflectors Outer Hemisphere Aperture Ring Inner Hemisphere Hemisphere Cover Bottom Deflector Mount Spider Plate & Exit Grids Dome Mount

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

  9. Attenuator Attenuator Down Switch Assembly Attenuator Up SMA Spring Block • Attenuator Design: • 30g moving mass • 2.17 N per wire, redundant wires in both directions • Must overcome 0.51 N switch spring force to actuate attenuator (in 1G) • 8x SMA force margin • 25% SMA wire over travel to ensure actuation Attenuator Slide

  10. STATIC Purge Operation N2 Viton O-Rings 1/8” NPT Cole Palmer compression fitting and right angle purge block. N2 purge path • 5psi N2 purge pressure

  11. STATIC MCP Assembly • No significant design changes since PDR Force Margin, MCP Springs

  12. STATIC Electronics Board Stackup LVPS Pulse to Anode FPGA Digital Sweep/ Deflector 15kV TDC Preamp Anode Digital pigtails to MDM on Preamplifier MCP Cover

  13. STATIC Electronics Box Construction HV Enable LVPS to PFDPU Airborne WTAX Digital to PFDPU Sweep HV Huber MMBX Coax HV to Deflectors

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

  15. STATIC TOF Acoustic Testing • Tested 3 Time of Flight Units at Wiley Labs (El Segundo, CA) • Configuration included: • E-Box with Preamp and TDC Boards • HV Tower, MCP Stack with Dummy MCPs, • Dummy Analyzer Closeout • Ran proto-flight levels for 90s each • No mechanical damage found during post-acoustics inspection One start frame slipped during acoustics. This issue has been addressed by redesigning the start frame.

  16. STATIC TOF Vibration Testing • Tested 3 Time of Flight Units • Tested Z and Y Axes random vibration, 1/4G pre and post sine surveys • Configuration included: • E-Box with Preamp and TDC Boards • HV Tower, MCP Stack with Dummy MCPs, • Dummy Analyzer Closeout Pre-Random 1/4G Sine Sweep Response: Random Vibration Spec:

  17. STATIC TOF Vibration Testing • Post-Vibration Inspection: • One unit had damage to HV Connection Tabs, which will be addressed with tab redesign • No frame slippage seen.

  18. STATIC TOF Design Changes New position of HV Tab allows tab to be added as final assembly step.

  19. STATIC ESA Middle Grid Assembly Electrical isolation via clearance slots Final assembly with outer grid Middle grid ground strip

  20. STATIC Mechanical Analysis • Aperture Modal Analysis • Assumptions: • Remote mass to simulate Attenuator, TOF, and Electronics • Fixed interface at mounting feet • Results: • 217 Hz First Mode • 14% Mass Participation • Electronic Box Wall Stress: • Required shielding of 0.1” • Low resulting stress in E-box parts • Aperture is stress limiting part • 70G static loading

  21. STATIC Mechanical Analysis • Aperture Static Load Analysis • Assumptions: • 350g remote mass to simulate attenuator • Fixed interface to Time of Flight Housing • 70G static load (Miles Equation Fn=221Hz & Q=20) • 8 Lb load from cover mechanism • Results:

  22. Cover Deflection and Load • Aperture under 70G radial load Burp Spring Plunger Cover Clamp Radially constrained, 0.010” gap • 8 lbf preload on Analyzer Cover

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

  24. Future Plan • ETU Testing • Carbon Foil vibration test – End of June • 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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