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

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

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

MAVEN Particles & Fields Package SWEA LPW (2) 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

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. 5

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 6

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

MAG Science Requirements Requirement ID Title Requirement Links from FRDs or Mission Requirements Document Verification Method Verified By TEST Verified By INSPECTION / ANALYSIS Verification Status PF82 MAG Dynamic Range MAG shall measure magnetic fields from 3 to 3000nT MRD70, PF82 Analysis Test Magnetometer dynamic range was measured during scale factor and offset verification, as detailed in the MAVEN Magnetometer Calibration Plan, MAVEN-MAG-PLAN-0114, section 4.0, Method #1. Scale factors are within 1% of the nominal Range 3 (65536 nT), Range 1 (2048 nT), and Range 0 (512 nT) full scale ranges. This provides MAG the opportunity to measure fields from < 1 nT up to 65536 nT. The magnetometer is designed to operate over a dynamic range of < 1 nT to 65536 nT. This is detailed in MAVEN-MAG-SPEC-0015, section 17. Verified PF83 MAG Accuracy MAG shall have an accuracy of better than 10% over its dynamic range MRD71, PF83 Magnetic vector accuracy was measured during scale factor and offset verification, as detailed in the MAVEN Magnetometer Calibration Plan, MAVEN-MAG-PLAN-0114, sections 3.0 and 4.0. During this test, MAG vector accuracy was established to better than 1%. The magnetometer is designed to have an accuracy of better than 1% in all conditions over the specified dynamic ranges. This is detailed in MAVEN-MAG-SPEC-0015, section 25. PF84 MAG Resolution MAG shall have resolution of better than 10% over its dynamic range MRD72, PF84 Magnetic vector resolution was measured during scale factor and offset verification, as detailed in the MAVEN Magnetometer Calibration Plan, MAVEN-MAG-PLAN-0114, sections 3.0 and 4.0. The resolution was demonstrated to be better than 0.01%. The magnetometer is designed to have an resolution of better than 1% in all conditions over the specified dynamic ranges. This is detailed in MAVEN-MAG-SPEC-0015, section 25. PF85 MAG Time Resolution MAG shall have time resolution of at least 20 seconds MRD73, PF85 Test The magnetometer samples the B field and telemeters data to the PFDPU at a rate of 32 Hz. This was verified during the MAVEN Magnetometer FPGA Checkout Procedure, MAVEN-MAG-PROC-0038, Sections 5.2 and 12.0. The time resolution is measured at better than 0.04 seconds. N/A

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

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

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

Thermal Balance/Modeling Results Balance Point Test Profile

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)

MAG Sensor Temperature Predicts

Orbit Avg Heater Power @ 30V

Updated Heater Power Profile

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

MAVEN MAG Power Summary MAG FM POWER IS AS EXPECTED ANALOG ELECTRONICS (MAD) POWER POWER NUMBERS ARE THE SAME AS FOR THE EM1 THAT IS 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 FROM THE 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 18

MAG Sensor & Bracket Mass (May 2012) Component CDR CBE + Cont. CBE Oct 4 2011 As weighed in Lab Comments Final FM as weighed May 1, 2012 FGM Sensor 390g (incl. cable) 388g (incl cable, MAVEN top cover) 383g (incl cable, top cover & base) Includes assy. hardware 468g Pigtail harness+connector 55g 166g Adj to match measured cable Incl. in sensor weight above 30” +- 1” length, shielded EMI Cover 60g 86g 48g Dec 2011 Clamshell design for EMI (RBSP cover= 30g) MLI Blanket 105 g Feb 2012 CBE based on Blanket similar to RBSP 98g Panel Mount Bracket 173g 122g 110g Moved from G10 to Carbon Composite 80g Sensor Totals Sensor with Bracket, Cover, Cube & Fasteners 392g No Cable or MLI included Sensor with Bracket, Cover, Cable, Cube and Fasteners 620g 616g MLI included 646g NOTES: CDR + Cont masses are presented for comparison. As weighed configurations are similar but not equal to current design. MAVEN-MAG-RPT-0141 19

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

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

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 22

Mechanical Testing Summary (2) Test Requirement (as per ERD/GEVS) Test Article Test Requirement (as per ERD/GEVS) AXES ERD /GEVS Levels 1 Mass Model with EM Adapter Plate/Bracket Random/Protflight/2min Y, Z, X 15.6 Grms 2 EM Sensor with EM Adapter Plate/Bracket Random/Protoflight/2 min per axis Sine Burst (Proof) as per GEVS 30.91g 24.03g 3 FM001 Sensor Assembly Random/Acceptance/1 min per axis 11.1 Grms 4 FM002 Sensor Assembly Note: Sensor Assembly includes Sensor, Adapter Plate and Bracket. 5/1/2012 GSFC - Magnetometer 23

Mechanical Testing Summary (3) Y axis Random/Sine Burst Z axis X axis Pass/Fail 1 15.58 Grms/ * 15.34 Grms/ * 15.67 Grms/ * Pass (Qualification) 2 15.56 Grms/30.98g 15.43 Grms/24.08g 15.55 Grms/24.0g (Qualificaiton) 3 10.92 Grms/30.79g 11.02 Grms/24.23g 11.16 Grms/23.98g (Acceptance/Proof) 4 11.15 Grms/31.0g 10.99 Grms/24.16g 11.18 Grms/24.11g 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 24

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 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 169 HRS BURN-IN PRE-DELIVERY TO UCB; UCB TO COMPLETE BURN IN HRS GSFC - Magnetometer 25

MAVEN MAG Calibration Timeline FM1 THINSHELL ZEROS MAGSAT 3-SPIN 23FEB12   √ 28FEB12 12MAR12 14MAR12 MARCH 13-21 THERMAL BALANCE 18APR12 APRIL 21-23 VIBRATION 19APR12 25APR12 27APR12 MAY 2-10 THERMAL CYCLES 14MAY12 X 15MAY12 FM2 13MAR12 MARCH 13-21 THERMAL BALANCE 21MAR12 20APR12 30APR12

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). 27

MAVEN Noise Performance 512 nT dynamic range (R0) 2048 nT dynamic range (R1) 65536 nT dynamic range (R3) 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.

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

MAVEN FM Noise Performance

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 31

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

Verification Matrix (FRD) GSFC - Magnetometer

Verification Matrix (ERD) GSFC - Magnetometer

Verification Matrix (ICD) GSFC - Magnetometer

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 36

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

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

MAG Instrument L4 Requirements (1)

MAG Instrument L4 Requirements (2)

MAG Instrument L4 Requirements (3)

MAG Instrument L4 Requirements (4)

MAG Instrument L4 Requirements (5)