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Particles and Fields Package Pre-Environmental Review May 22 -23, 2012

Mars Atmosphere and Volatile EvolutioN (MAVEN) Mission. Particles and Fields Package Pre-Environmental Review May 22 -23, 2012 14 - SWEA (Solar Wind Electron Analyzer) D. L. Mitchell and the SWEA Team. SWEA PER Outline. Overview Test Results Vibration Plans Thermal Vacuum Plans.

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Particles and Fields Package Pre-Environmental Review May 22 -23, 2012

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  1. Mars Atmosphere and Volatile EvolutioN (MAVEN) Mission Particles and Fields Package Pre-Environmental Review May 22 -23, 2012 14 - SWEA (Solar Wind Electron Analyzer) D. L. Mitchell and the SWEA Team

  2. SWEA PER Outline Overview Test Results Vibration Plans Thermal Vacuum Plans

  3. SWEA Integration Status & PFR Status SWEA FM build is complete PWB Stake/Coat for Digital and LVPS following calibration PFRs resolved (not requiring FRB) Mismatch between revision and date codes on LVPS board and test documentation Supplier sent corrected docs Digital board solder rework Raised IC’s staked, gouge in solder mask repaired with Arathane Capacitor change on amplifier board 1-nF capacitor changed to 100-pF for improved test pulser signal Reversed orientations for HV enable plug and Digital-to-Analyzer connector HV enable plug works either way; connector opening squared, analyzer harness redressed Operational heater wires causing noise Op. Heater not needed; wires cut

  4. PFRs Requiring FRB PFR024 – SWEA Intermittents Evidence of high voltage transients in vacuum 2-3 days after start of pump-down. No damage. Tracked down to air bubbles in staking material used on anode board near high voltage components FRB held Anode replaced with spare without staking HV capacitors reinforced with epoxy Tested in vacuum with no issues Closed, pending final signature Before (with staking) After (with epoxy)

  5. PFRs Requiring FRB PFR032 – SWEA Damaged Major high voltage event caused by inadvertently leaving instrument powered on (including one section of high voltage) during pump-down. Damage to a number of parts. Analysis also indicates potential stress to other parts. FRB held All damaged and potentially stressed parts replaced and re-tested Closure pending parts failure analysis All anodes functioning normally

  6. PFRs Requiring FRB • PFR059 – SWEA Damaged • Preamp #5 (A111F) failed during MCP HV ramp up on 5/10. • Preamp has been replaced  retest, reassembly underway. • Searching all existing test data for transients.

  7. SWEA Test Status FM Sensor (IRAP) delivered to SSL in January Sensor fully calibrated at IRAP FM Digital and LVPS boards (SSL) Tested separately on the bench Integrated into SSL pedestal and tested with EM Sensor FM System Level Testing In Progress FM Analyzer integrated with FM pedestal Functional tests completed SSL calibrations 75% complete (interrupted by PFR 59) Comprehensive Performance Test Completed First SWEA Instrument CPT Complete (except for s/c controlled heater and temp sensor) PFDPU Integration and PF CPT after Digital/LVPS thermal cycling and stake/coat

  8. SWEA Resource Update Current draw with simulated science operation Test with fully integrated FM instrument in vacuum chamber NR and MCP HV’s on, analyzer and deflector sweeps enabled Test pulser on to generate counts Current draw on 28-V primary supply: 35.2 mA (mean), 52.0 mA (peak) Measured Power: 0.986 W (mean), 1.456 W (peak) CBE Power: 1.074 W (PDR), 0.992 W (CDR) Allocation: 1.240 W Mass measurement TBD after calibrations, when instrument is out of chamber. Min: 58 mA, Max 90 mA Mean 62 mA

  9. SWEA FM Bench Tests Functional tests of Digital and LVPS boards separately and integrated with IRAP sensor Preamp and HVPS Digital and LVPS Side-by-side bench test with FM pedestal and FM analyzer: Test Pulser showing expected pattern

  10. SWEA FM CPT Verify AlivenessL✔ Verify HousekeepingL✔ Verify Data ProductL✔ Run Test PulserL✔ Test S/C controlled Heater/Temp Sensor (A&B sides) TBD Open Top-cap with S/C Controlled Actuator (A&B sides)✔ Verify High Voltage Operation ✔ Test MemoryL✔ Power DownL✔ Reset Actuator ✔ MAVEN_SWEA_PROC_008 P1 P2 (*) Purge and/or vacuum required LAlso Part of LPT

  11. SWEA Trending Values for I&T/ATLO Housekeeping Values Digital and Analog Voltages With (if configuration allows) and without HV enabled and ramped up Instrument Power Draw With (if configuration allows) and without HV enabled and ramped up Background Count Rates With (if configuration allows) and without MCP HV on and ramped up To get intrinsic instrument electronic background (effectively zero) & channel plate background (~10 c/s for whole instrument)

  12. FM Analyzer Calibration Setup (IRAP) Reference: MAVEN_SWEA_RPT_0111 Electron Beam Map

  13. SWEA FM MCP Characterization Phi Scan: Full 360 degrees Dead time Gain Optimization MCP Noise

  14. SWEA FM Analyzer Calibration Results

  15. SWEA FM Analyzer Calibration Results Analyzer Constant Deflector Calibration

  16. SWEA FM Analyzer Calibration Results Geometric Factor, summed over all anodes at zero elevation: G ≈ 0.009 cm2 sr eV/eV

  17. SWEA FM System Level Test Facilities 3-axis Helmholtz coil Electron Gun Ion Gun SWEA FM in the vacuum chamber SSL vacuum chamber (top) opening into Class 10,000 clean room (bottom)

  18. SWEA FM Full Instrument Calibration Electron Beam Profile: Similar size/uniformity to IRAP electron gun Verification of Azimuthal Response

  19. SWEA FM Full Instrument Calibration Concentricity Scan Variation of analyzer constant < 2%, consistent with IRAP calibration  disassembly and reassembly of analyzer during replacement of anode board (PFR 024) did not affect concentricity.

  20. SWIA PF Level 3 Requirements Reference: MAVEN_SWEA_PLAN_0165

  21. SWEA Vibration Plans Reference: MAVEN_SWEA_PROC_0090 • SWEA FM double bagged, unpowered, off N2 purge < 24 hours • Vibration test in 3 axes, one at a time, ~90 min each • Vibration test levels per ERD (see tables below) • Pass/Fail • Pre and Post Sine survey • < 3% frequency shift • < 30% amplitude change • First natural freq. > 50 Hz • No loose fasteners • No hardware deformations • Pass post-vibe functional

  22. SWEA TVAC Configuration Reference: MAVEN_SWEA_PROC_0086 28V Power Supply TQCM Cover/Heater Relay Box SWEA Cover Mon/ Thermister Power Supply Source Ni-63 NETGEAR GSEOS PC MISG BOX KEY: SWE-J2 Enable Plug SWE-J1 28V Power Supply MGSE EGSE Standoffs (cycle 1 only) Flight HW Note: some portion of TVAC HV Test will include interface to EM PFDPU outside chamber. Adapter Plate TVAC Chamber

  23. SWEA TVAC Cycles Reference: MAVEN_SWEA_PROC_0086 Cycle Number: 1 2 3 4 5 6 7 8 LPT LPT LPT LPT LPT CPT Hot Survival/Balance Bake-Out Open Cover Break Vacuum: Reset Cover, LPT LPT HV On HV On Reconfigure to I/F to EM PFDPU Open Cover LPT LPT LPT LPT CPT CPT Cold Survival/Balance

  24. TVAC Functional Plan

  25. Schedule Summary, PER to Delivery

  26. Schedule Summary, PER to Delivery • EM pedestal: • Resolve PFR 59 • FM Pedestal: • LVPS magnetics thermal cycle and burn-in • Stake & Coat • Reintegrate FM Pedestal and FM Sensor • Complete calibrations (if there is time) • PFP I&T on 6/25 • Complete calibrations during slack in Aug/Sep (if necessary)

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