SWT Overview 1 UCB, Nov15/16, 2006 THEMIS SCIENCE WORKING TEAM MEETING Mission Overview Peter R. Harvey Project Manager University of California - Berkeley.

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Presentation transcript:

SWT Overview 1 UCB, Nov15/16, 2006 THEMIS SCIENCE WORKING TEAM MEETING Mission Overview Peter R. Harvey Project Manager University of California - Berkeley

SWT Overview 2 UCB, Nov15/16, 2006 Mission Parameters Launch Vehicle:Delta II, Eastern Range Apogee:84191 km ± 9567 km Perigee:400 km ± 6 km Inclination:17.0 deg ± 0.5 deg Date:Feb 15, 2007 Space Segment Spacecraft:5 Spinning Probes with Fuel for Orbit & Attitude Adjust Instruments:3-Axis Electric Field, Magnetic Field 3-D Ion & Electron Particle Detectors Spin Rate:20 RPM Orbit Period(s):1, 2 and 4 days Orientation:Ecliptic Normal Ground Segment Observatories:20 Northern with All Sky Imagers and Magnetometers Control Facilities:Mission and Science Operations Centers Operations Phases:L&EO, Cruise, Ascent, Campaigns, De-orbit Lifetime:2.3 years Mission Summary

SWT Overview 3 UCB, Nov15/16, 2006 Instrument Configuration IDPU: Instrument Data Processor Unit SPB : Spin Plane Booms (4x) AXB : Axial Booms (2x) SST : Solid State Telescope (2x) ESA : Electrostatic Analyzer FGM : Fluxgate Magnetometer SCM : Search Coil Magnetometer

SWT Overview 4 UCB, Nov15/16, 2006 Fuel Tank ESA EFI SPB Thruster T1 EFI Axial Booms (2, Stowed) Battery BAU Repress Tank Miniature Sun Sensor Transponder Thruster T2 IDPU Fuel Tank Antenna EFI SPB Thruster A1 Thruster A2 AEB Gyros Probe Configuration

SWT Overview 5 UCB, Nov15/16, 2006 Standard Delta 10 ft. Fairing Static Envelope 3712 PAF Probe Carrier Assembly (PCA = 5 Probes + Probe Carrier) on L/V Probe Carrier Assembly (PCA = 5 Probes + Probe Carrier) on L/V THEMIS Launch Configuration Probe Carrier Assembly (PCA) on Delta 3 rd Stage Launch Configuration Dedicated launch accommodated within standard Delta vehicle configuration and services 10’ Composite Fairing required to accommodate five Probes on the Probe Carrier in the “Wedding Cake” configuration PC stays attached to Delta 3 rd stage after probe dispense Each probe dispense from the PCA is coordinated with but independent of the other probes No single probe anomaly precludes dispense of remaining probes Star 48 3 rd Stage

SWT Overview 6 UCB, Nov15/16, 2006 Probe & PC Status Probe Status Environmental Tests June Environmental Tests June

SWT Overview 7 UCB, Nov15/16, 2006 Probe & PC Status Probe Status Probes 1 to 5 LPTs PC & Mass Dummies July Probes 1 to 5 LPTs PC & Mass Dummies July

SWT Overview 8 UCB, Nov15/16, 2006 Probe & PC Status PCA Assembly and Test, July

SWT Overview 9 UCB, Nov15/16, 2006 Probe & PC Status PCA Vibration, July

SWT Overview 10 UCB, Nov15/16, 2006 Probe & PC Status Probe/PC Testing at JPL, July Probes 3 and 4 Prepare for Thermal VacuumProbe 2 and PC get boxed up Probes 1 and 5 are Spin-Balanced and Magnetically Tested

SWT Overview 11 UCB, Nov15/16, 2006 Probe & PC Status ProbeTesting at JPL, July 24-Aug Probes 3 and 4 Removal from TVProbes 3 and 4 Transport to SAF Probes 3 and 4 Arrive at SAFProbes 3 and 4 Mag Testing

SWT Overview 12 UCB, Nov15/16, 2006 Probe & PC Status Probe Testing at JPL, thru Aug Probes 1 and 5 Removal from TV Probes 1 and 5 Transport to SAF Probe 1 on Rollover Fixture for ESA \ Probes 1- 5 at Rest in SAFFinal Balance

SWT Overview 13 UCB, Nov15/16, 2006 Probe & PC Status Probe Testing at JPL, thru Aug Probes 1 and 5 Removal from TV Probes 1 and 5 Transport to SAF Probe 1 on Rollover Fixture for ESA \ Probes 1- 5 at Rest in SAF

SWT Overview 14 UCB, Nov15/16, 2006 Probe & PC Status EFI Preamp Current Issue (PFR181a)  Historic Current Variations in EFI Preamps 3-10mA  PreShip Review Team Requested More Tests  Extended Vacuum Testing on FM6 hit 20mA (red limit)  Determined Reversed Polarity Caps (on silkscreen)  Manufacturer Allows 10-15% reverse bias  EFI Preamps Use 20% reverse bias  Lifetime severely limited in reversed polarity.  Expected to fail prior to primary mission.  Replace all EFI Preamp Caps in proper orientation  Verify No Other Caps Reversed Probes 1- 5 at Rest in SAF

SWT Overview 15 UCB, Nov15/16, 2006 Probe & PC Status EFI Preamp Repair Plan UCB-NASA Meeting to Gain Concurrence Build/Qualify New Stands Remove Solar Arrays Remove SPBs Remove AXBs  Remove Preamps  Replace Caps with proper orientation  Preamp Electrical  Conformal Coat  Reassemble SPB and AXB  SPB and AXB Electrical Functional  SPB and AXB Vibration Tests  EFI Functional using FM6 IDPU  Install AXBs  Install SPBs  EFI Functional (Probe Level)  Install Solar Arrays  Probe Functional Probe 1 on Rollover Fixture for ESA \ Probes 1- 5 at Rest in SAF

SWT Overview 16 UCB, Nov15/16, 2006 Probe & PC Status EFI Preamp Repair – Removal of SPBs and AXBs Probe 1 on Rollover Fixture for ESA \ Probes 1- 5 at Rest in SAF

SWT Overview 17 UCB, Nov15/16, 2006 Milestones Ahead

SWT Overview 18 UCB, Nov15/16, 2006 Reviews Ahead