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Particles and Fields Package Pre-Ship Review October 30,31, 2012 19: Magnetometer

Mars Atmosphere and Volatile EvolutioN (MAVEN) Mission. Particles and Fields Package Pre-Ship Review October 30,31, 2012 19: Magnetometer Jack Connerney/Ron Oliversen. Particles & Fields Package Pre-Ship Review Magnetometer October 30-31, 2012 UCB. Jack Connerney/695 Dave Sheppard/564

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Particles and Fields Package Pre-Ship Review October 30,31, 2012 19: Magnetometer

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  1. Mars Atmosphere and Volatile EvolutioN (MAVEN) Mission Particles and Fields Package Pre-Ship Review October 30,31, 2012 19: Magnetometer Jack Connerney/Ron Oliversen

  2. Particles & Fields Package Pre-Ship ReviewMagnetometerOctober 30-31, 2012UCB Jack Connerney/695 Dave Sheppard/564 James Odom/564 Steve Himes/322 Ron Oliversen/695 Scott Murphy/695 Jared Espley/695 John Hawk/545

  3. MAG: Magnetometer Investigation • What are MAG goals ? • Measure vector magnetic field • Characterize solar wind interaction • Support particles and fields package (ions, electrons, energetic particles & waves). • Where ? • Every orbit reaches below ~ 400 km at periapsis; “deep dips” probe to ~ 125 km. • Mission design provides broad coverage of solar wind and interaction regions (sheath, pileup region, wake). • Why ? • Together with other MAVEN instruments to understand present and past atmospheric loss MAG Team: Jack Connerney, Jared Espley, Dave Sheppard, Ron Oliversen, Jim Odom, Scott Murphy, Pat Lawton, John Hawk, Haydee Aguilar, Steve Himes & engineering support Environment well understood GSFC - Magnetometer

  4. MAVEN Particles & Fields Package LPW (2) SWEA Solar Wind Ion Analyzer (SWIA) – SSL Solar Wind Electron Analyzer (SWEA) – CESR / SSL Langmuir Probe and Waves (LPW) – LASP / SSL LPW/Extreme Ultra-Violet (LPW-EUV) – LASP Solar Energetic Particle Detector (SEP) – SSL Magnetometer (MAG) – GSFC Supra-Thermal and Thermal Ion Composition (STATIC) - SSL LPW-EUVM MAG SWIA SEP (2) STATIC MAG

  5. MAVEN Particle and Fields Package GSFC Provided 10cm • Two independent MAG sensors, electronics boards and a/c heaters; • Powered by two independent PFP power supplies. • Fully redundant hardware configuration.

  6. MAG: a Heritage M. Acuña Fluxgate • Ring core fluxgate magnetometer (FGM) • –> 3 dynamic ranges: • +/- 65,536 nT • +/- 2048 nT • +/- 512 nT • 0.015 nT resolution (16-bit A/D) Goddard has flown similar fluxgates for 40 yrs. MAVEN design is most similar to RBSP w/some Juno features (FPGA control w/ autoranging, housekeeping). EEE parts are nearly identical to those used on Juno & RBSP (the same lots are being utilized) GSFC - Magnetometer

  7. MAG Team Mug Shots Jared Espley Science & GSE Jack Connerney Instrument PI Jim Odom Senior Technician Scott Murphy Mechanical Engineer Pat Lawton Ground Systems Ron Oliversen Instrument Manager Dave Sheppard Systems Engineer

  8. MAG Science Requirements

  9. MAG Mini-PSR - 1 • Purpose: Project review to determine that the magnetometers being delivered to UCB meet GSFC standards • When: 2012 May 2 @GSFC • Attendees: • Nick Jedrich / MAVEN Project • Jim Morrissey / MAVEN Project • Oscar Cheatom / GSFC Product Assurance • Dave Curtis / UCB • MAG Team (Jack Connerney, Jared Espley, John Hawk, Steve Himes, Scott Murphy, Ron Oliversen, Jim Odom, Dave Sheppard) • Results: Magnetometer meet or exceed specifications • MAVEN_MAG_PSR_slides.pdf • 2012 05 04 MAG PSR_approval to ship letter.pdf • Delivered to UCB: 21 May 2012 GSFC - Magnetometer

  10. MAG Mini-PSR - 2 • MAG Stand-alone Environmental Testing: • Sensor Thermal Balance (MAVEN-MAG-Test-0038) • Bracket/Sensor Vibration (MAVEN-MAG-RPT-0113) • Thermal Cycling (in air) & VTFMT • MAG Analog Electronics (MAVEN-MAG-RPT-0102) • AC Heater Electronics (ACHE) (MAVEN-MAG-TEST-0030) • Sensors (MAVEN-MAG-RPT-0102) • Calibration (MAVEN-MAG-RPT-0144) • Open Items (May 2) • WOA Closures • EIDP Completion: 5/18/2012 • MAVEN-PFR-009 (Increase heater power): Closed 6/12/2012 • ACHE 200 hours burn-in with transformer change: • Completed 5/9/2012 (MAVEN logbook 00117 pg. 25 – 29) • Instrument Level 4 Requirements are Verified (included in Backup Charts): • MAVEN-MAG-MTRX-0009_released_4-7-11.xlsx

  11. Thermal Balance/Modeling Results • The primary objective of this test was to validate the thermal model and temperature predictions for the magnetometer sensor • The test consisted of two balance points • Hot balance • Cold balance • After TB completion additional sensitivity tests were performed • Eclipse case simulated • Used the test data to validate the magnetometer sensor thermal model and updated flight temperature predictions using validated model and most recent spacecraft thermal model

  12. Thermal Balance/Modeling Results Balance Point Test Profile

  13. Thermal Balance/Modeling Results • Initial Model to Test Result discrepancies revealed a missing heat leak (thermal node) in the model • Model predictions required more heater power (MAVEN-PFR-009) • Model Update yielded the Model Correlation Results (below)

  14. MAG Sensor Temperature Predicts

  15. Orbit Avg Heater Power @ 30V

  16. Updated Heater Power Profile

  17. Thermal Modeling Conclusions • Thermal model successfully correlated. • Flight predictions using the verified thermal model are well within the temperature limits and show adequate heater power margin with the new ACHE board. • MAVEN-MAG-TEST-0038

  18. MAVEN MAG Power Summary • MAG FM POWER IS AS EXPECTED • ANALOG ELECTRONICS (MAD) POWER • POWER NUMBERS ARE THE SAME AS FOR THE EM1 THATIS IN USE NOW AT SSL AND AS PRESENTED AT CDR • LOW FIELD (~1000 nT) POWER AT +/-13V IS 1.05W • POWER IN EARTH FIELD (~52k nT) AT +/-13V IS 1.16W • MAX POWER AT STARTUP (+/-13V, NO HFCLK FROMTHE PFDPU) IS 1.34W • AC HEATER ELECTRONICS (ACHE) POWER • POWER HAS INCREASED TO ACCOUNT FOR AN UPDATED THERMAL MODEL (PFR-009). • OPERATES ON AN UNREGULATED BUS, +24V TO +36V • +24V MAXIMUM POWER IS 2.4W • +30V MAXIMUM POWER IS 3.8W • +36V MAXIMUM POWER IS 5.5W 5/2/2012 GSFC - Magnetometer

  19. MAG Sensor & Bracket Mass (May 2012) NOTES: • CDR + Cont masses are presented for comparison. • As weighed configurations are similar but not equal to current design. • MAVEN-MAG-RPT-0141

  20. MAVEN Mag Sensor and Bracket Mag Sensor with two piece T300 composite cover (to be covered with Cu tape) IM-7 Adapter Plate (travels with Sensor during testing) ½” Alignment Cube IM-7 angle bracket for cube IM-7 Composite Bracket with Ti inserts for fasteners

  21. MAVEN Mag Sensors & Fixtures As delivered to UCB for integration, May, 2012

  22. Mechanical Testing Summary (1) • Documentation: • WOAs • WOA-MAVEN-MAG-0172 • WOA-MAVEN-MAG-0177 • WOA-MAVEN-MAG-0178 • Plans • MAVEN-MAG-PLAN-0150 • MAVEN-MAG-PLAN-0151 • MAVEN-MAG-PLAN-0152 • MAVEN-MAG-PLAN-0153 • MAVEN-MAG-PLAN-0154 • Reports • MAVEN-MAG-RPT-0113 5/1/2012 GSFC - Magnetometer

  23. Mechanical Testing Summary (2) Note: Sensor Assembly includes Sensor, Adapter Plate and Bracket. 5/1/2012 GSFC - Magnetometer

  24. Mechanical Testing Summary (3) Notes: Sine Burst was not performed on Mass Model Static Load testing on the Mass Model/EM Bracket Assembly Showed a composite yield limit at 1939 lbf (Y axis) 5/1/2012 GSFC - Magnetometer

  25. Magnetometer Temperature Cycling • AC HEATER ELECTRONICS. • COMPLETED TEMPERATURE CYCLES & >200 HRS BURN-IN AT GSFC • COMPLETED TVAC WITH PFP PACKAGE AT UCB • ANALOG ELECTRONICS • COMPLETED TEMPERATURE CYCLING & >200 HRS BURN-IN AT GSFC • COMPLETED TVAC WITH PFP PACKAGE AT UCB • SENSORS • TEMPERATURE CYCLED AT GSFC IN AMBIENT, POWERED ON IN THE BLDG 34 LABORATORY • 12 CYCLES • CYCLE 1 - +75C TO -35C • CYCLE 2 TO 12 - +60 TO -20C • 4 HOT/COLD STARTS, 4 HOUR SOAKS • 1C/MIN TRANSISTION RATE • FILTER BOXES • TEMPERATURE CYCLED AT GSFC IN AMBIENT, POWERED ON IN THE BLDG 34 LABORATORY • 169 HRS BURN-IN PRE-DELIVERY TO UCB; UCB TO COMPLETE BURN IN HRS GSFC - Magnetometer

  26. MAVEN MAG Calibration Timeline

  27. MAVEN MAG – MAGSAT Calibration MAGSAT calibration method simultaneously solves for sensor scale factors, orthogonality, and coil system (facility) orthogonality, via a series of precise 90 degree rotations (sensor optical cubes with 10 arcsec accuracy and theodolites).

  28. MAVEN Noise Performance 512 nT dynamic range (R0) 2048 nT dynamic range (R1) 65536 nT dynamic range (R3) nT nT nT Samples (sec/32) • Measured noise in Mu-metal shield can at magnetic test facility (includes environmental noise and instrument noise). • ~ ±0.1 nT variation in both operational ranges 0 & 1 (<< 1 nT requirement L4-FGM-04). • Range 3 (Earth environment test and ATLO functionality only) noise is limited by the digital step size of the 16-bit A/D converter.

  29. MAVEN FM Noise Performance • Measured at magnetic test site over the weekend MAVEN Magnetometer Calibration Report: MAVEN-MAG-RPT-0145

  30. MAVEN FM Noise Performance

  31. MAVEN FM2 Calibrations Example IDL> mcsum,DIR='MAVEN/FM2/15May12',RNG=3,/NRM Magsat Analysis range: 3 normalized Fit RMS: 1.13 Run Time: Tue May 15 11:45:08 2012 zeros file: /Users/jackconnerney/idl/cal/MAVEN/FM2/15May12/zeros/mv_tt_ttp.txt magsat file: /Users/jackconnerney/idl/cal/MAVEN/FM2/15May12/magsat/mv_tt_ttp.txt facgrd file: /Users/jackconnerney/idl/cal/MAVEN/FM2/15May12/fac_grad/mv_tt_ttp.txt zerotable: 0.442250 -0.070500 1.204000 0.000000 0.311500 -0.058000 1.294500 0.000000 -5.568750 0.155250 4.711500 0.000000 scale factors: 0.992422 0.993478 0.990445 sensor model amx: 1.000000 0.003367 -0.004583 0.001080 1.000000 0.000818 0.004007 0.002564 1.000000 symmetric part: 1.000000 0.002223 -0.000288 0.002223 1.000000 0.001691 -0.000288 0.001691 1.000000 a-symmetric part: 0.000000 0.001143 -0.004295 -0.001143 0.000000 -0.000873 0.004295 0.000873 0.000000 rotation by: 0.259510 degrees about unit vector: 0.192731 -0.948231 -0.252415 < MAGSAT calibration method File: /Users/jackconnerney/idl/cal/Maven/FM2/15May12/thinshellFM2.sts Iteration: 3 Constraints: 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. Std. Dev.: 0.53545255 Zeros (x, y, z): -6.228662 0.042541 4.579845 Scale factors: 0.992155 0.993195 0.990182 Sensor model (symmetric) A Matrix: 1.000000 0.002214 -0.000304 0.002214 1.000000 0.001726 -0.000304 0.001726 1.000000 continue?: “thin shell” calibration method in box

  32. ACHE Filter Boxes • UCB PFP EMI/EMC test found an EMI exceedance in conducted emission and conducted susceptibility • SSL & GSFC Trade Study concluded the best approach was to to add an external filter to the ACHE board • GSFC designed the filter & shipped breadboard to SSL • SSL tested the filter • One capacitor was added to design to meet specs • Final design was built & tested: MAVEN-MAG-TEST-0030 • 12 thermal cycles (GEVs) • 169 hrs burn-in (additional 31 hrs at UCB) • Delivered to UCB to insert into I&T flow (10/25) • Installed, vibe tested & operational on PFDPU

  33. Verification Matrix (FRD) GSFC - Magnetometer

  34. Verification Matrix (ERD) GSFC - Magnetometer

  35. Verification Matrix (ICD) GSFC - Magnetometer

  36. SMA and EIDP • Full EIDP for May 2012 MAG delivery and Filter Box Oct 2012 delivery is maintained at GSFC and posted on MAVEN MIS. Associated documentation (WOAs, etc., will not be printed as they are available on MIS). • A subset of the full EIDP is provided to UCB along with the hardware. • This set does not include the following: • Schematics • Reference designators on as-built • Any other information considered “PROPRIETARY” • Open Items: • WOA Closure (11/16/12) GSFC - Magnetometer

  37. MAVEN MAG Summary MAGs meet or exceed all specifications. Need to finish run time hours on filter boxes (Oct 25, 2012) to be completed at UCB after integration. Need to close-out paperwork (WOAs: 11/16/12). FGMs delivered to UCB on May 21, 2012. Filter boxes delivered to UCB on Oct 25, 2012. Ready to support ATLO activities at LM MLI delivery & installation to LM Testing Magnetic Screening

  38. MAVEN MAG ADDENDUM Level 4 Requirements Matrix from GSFC PSR (May 2012) MAVEN-MAG-MTRX-0009_released_4-7-11.xlsx

  39. MAG Instrument L4 Requirements (1)

  40. MAG Instrument L4 Requirements (2)

  41. MAG Instrument L4 Requirements (3)

  42. MAG Instrument L4 Requirements (4)

  43. MAG Instrument L4 Requirements (5)

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