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THEMIS PROBE MISSION PRE-SHIP REVIEW (Update on repressurization) Michael Sholl PowerPoint Presentation
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THEMIS PROBE MISSION PRE-SHIP REVIEW (Update on repressurization) Michael Sholl University of California – Berkeley RCS Engineer. Repressurization Limits. Thruster qualification levels (MR111C 1lbf thrusters) Steady-state upper limit: 450psi

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slide1
THEMIS PROBE
  • MISSION PRE-SHIP REVIEW
  • (Update on repressurization)
  • Michael Sholl
  • University of California – Berkeley
  • RCS Engineer
repressurization limits
Repressurization Limits
  • Thruster qualification levels (MR111C 1lbf thrusters)
    • Steady-state upper limit: 450psi
    • Pulsed upper limit: 400psi (Radarsat, Landsat 6)
    • THEMIS operational upper limit: 400psi
    • Pulsed qualification lower limit: 80psi
    • Additional ATP testing on all THEMIS flight units to 50psi
    • THEMIS operational lower limit: 75psi
    • Required: Offload 0.5kg N2H4 (see next slide)
operational constraints
Operational Constraints
  • 10m/s Δν required by mission operations (0.5kg)
  • N2H4 loading requirement: 48.8kg ±0.2kg
  • KSC fueling group scale accuracy: 0.2kg
  • Precision weights used to increase accuracy further
  • Conclusion: healthy repressurization margins with 0.5kg N2H4 offload