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STEIN Mechanical Systems

Review of STEIN mechanical requirements, instrument overview, subsystems, and progress to date in the space physics laboratory at UC Berkeley. Details on housing, deflectors, attenuator, and mounting for space research. Current status on vibration and thermal tests.

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STEIN Mechanical Systems

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  1. STEIN Mechanical Systems David Glaser Space Science Laboratory Space Physics Research Group UC Berkeley STEIN Review UCB/SSL Nov 10, 2011

  2. Overview • Mechanical Requirements • Instrument Overview • Mechanical Subsystems • Progress to Date • Concluding Remarks STEIN Review UCB/SSL Nov 10, 2011

  3. Mechanical Requirements • Large FOV/Geometric Factor • Little scattered light reaching detector • 4 mm spaced HV deflectors spaced at least 2 mm from structure • Detector 10 mm behind electrostatic deflectors • Light tight behind detector • Retractable mechanical attenuator that • Reduces particle flux by 99% • Requires no power except when opening or closing • Produces no large magnetic fields • Instrument must fit into the CINEMA chassis • Instrument must withstand launch vibration levels STEIN Review UCB/SSL Nov 10, 2011

  4. Instrument Overview • Collimator FOV 60°x 40° • ± 2000 V Field Separates Electrons, Ions, and Neutrals to ~20 keV • Particle Attenuator • (Blocks 99% of Particles) STEIN Review UCB/SSL Nov 10, 2011

  5. Mechanical Subsystems • Housing • Baffles/Collimator • Electrostatic Deflectors • Attenuator • Electronics Mounting STEIN Review UCB/SSL Nov 10, 2011

  6. STEIN Housing STEIN Review UCB/SSL Nov 10, 2011

  7. STEIN Housing • Photoetched BeCu • Ebonol C Blackened Surface • Attached with Epoxy STEIN Review UCB/SSL Nov 10, 2011

  8. Baffles 60°x 40° Aperture STEIN Review UCB/SSL Nov 10, 2011

  9. Electrostatic Deflectors Leaves chosen instead of flat surface minimize scattered electrons on detector STEIN Review UCB/SSL Nov 10, 2011

  10. Electrostatic Deflectors 4 mm Separation Between High Voltage Surfaces STEIN Review UCB/SSL Nov 10, 2011

  11. STEIN Attenuator • Mechanism Heritage from THEMIS Mission • Nanomuscles – Shape Memory Alloy Actuators • Bi-Stable Overcenter Mechanism STEIN Review UCB/SSL Nov 10, 2011

  12. STEIN Attenuator • SMA Actuator • Nanomuscle modified for Structural Soundness • No significant ferromagnetic parts • Each actuation: ~2.5W for 0.15 sec • Life test for >70,000 cycles STEIN Review UCB/SSL Nov 10, 2011

  13. STEIN Attenuator STEIN Review UCB/SSL Nov 10, 2011

  14. Electronics Mounting Rear view with Cover Shown Transparent Cross-Section with Detector Plane STEIN Review UCB/SSL Nov 10, 2011

  15. STEIN in Context Electronics Cover Aperture Attenuator Mechanism STEIN Review UCB/SSL Nov 10, 2011

  16. STEIN in Context

  17. STEIN in Context STEIN Review UCB/SSL Nov 10, 2011

  18. Mechanical Requirements Status • DONE Large FOV/Geometric Factor • TBD Little scattered light reaching detector • DONE 4 mm spaced HV deflectors spaced at least 2 mm from structure • DONE Detector 10 mm behind electrostatic deflectors • TBD Light tight behind detector • Retractable mechanical attenuator that • TBD Reduces particle flux by 99% • DONE Requires no power except when opening or closing • DONE Produces no large magnetic fields • DONE Instrument must fit into the CINEMA chassis • PARTIALLY DONE Instrument must withstand launch vibration levels STEIN Review UCB/SSL Nov 10, 2011

  19. Current Status • Vibration Test at 14 GRMS – Mechanical Passed • Vibration Test at 18 GRMS – One unstaked screw came loose, otherwise passed • Thermal Test – Scheduled for Late November • 2nd STEIN instrument: 75% of Mechanical Parts Have Been Fabricated STEIN Review UCB/SSL Nov 10, 2011

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