Solar Probe Plus – FIELDS V1234 PA/Antenna Instrument Pre-Environmental Review Systems Keith Goetz University of Minnesota Goetz@umn.edu 26 April 2017

SPP/FIELDS V1234 Two Sides Each has a Spacecraft I/F Each has a Magnetometer Each has Antenna Biasing Each has a Power Supply FIELDS1 also has Data Controller Board Radio Frequency Spectrometer Digital Fields Board SCM Calibration Control Absolute Time Sequencer TDS I/F FIELDS2 also has Time Domain Sampler DCB I/F SWEAP I/F V1234

SPP/FIELDS Unchanged from CDR Five voltage sensors V2 electric antenna Unchanged from CDR Five voltage sensors Two Fluxgate magnetometers One Search-Coil Magnetometer Main Electronics Package V3 electric antenna MAGi, MAGo MEP V4 electric antenna V5, SCM V1 electric antenna

MEP – Buttoned Up

MAG Boom – FM Test Fit

On the S/C

On the S/C

MEP Subsystems DCB – FIELDS1 TDS – FIELDS2 DFB AEB1/AEB2 MAGi/MAGo DCB2 built and tested – delivered and ready for S/C I&T TDS – FIELDS2 TDS built and tested – delivered and ready for S/C I&T Some residual risk of data problems DFB DFB2 built and tested – delivered and ready for S/C I&T Some small residual risk of data problems AEB1/AEB2 Built and tested – delivered and ready for S/C I&T MAGi/MAGo LNPS1/LNPS2

FIELDS Sensors SCM V5 probe MAGi/MAGo V1234 antennas and preamps FM1 built and tested – open circuit found in thermal cycling FM2 is being built as replacement – environmental testing starting now V5 probe Built and tested – delivered and ready for S/C I&T MAGi/MAGo V1234 antennas and preamps Design complete EM success Assemblies nearly complete and functional Ready for environmental

Instrument and Interfaces ICD status with S/C Still evolving and collecting information i dotting and t crossing Final mechanical interfaces (antennas) recently completed No blocking TBDs ICD status internal No TBDs Interfaces well tested on high fidelity EMs Interfaces fully functional on FM ICD status with SWEAP Tested at EM level Tests pending for FM

Changes Since CDR Rotated MEP on S/C 180 degrees Simplifies harnessing Finalized SWEAP interface Tracked minor S/C changes TDS V5 is now AC coupled Added APL clamshells and forks Provides whip restraint in sine-sweep vibration

MEP Resources Resources are tracked continuously and reported monthly V1234 caging elements removed mass (in favor of APL clamshells) MEP power NTE reduced ~2W (with better measurements) at iCDR Mass MEP 7.500kg CBE 7.83kg NTE FIELDS 22.73kg CBE 19.65kg NTE (harnessing increase) V1234 ~2.4kg CBE each 9.7kg NTE MEP Power FIELDS1 12.81W CBE 14.44W NTE FIELDS2 9.62W CBE 10.19W NTE MEP 22.43W CBE V1234 PA .25W CBE each (secondary)

Internal Grounding

FIELDS System Reviews iPDR 13 November 2013 All RFAs concurred mPDR 15 January 2015 No RFAs iCDR 13 January 2015 All RFAs complete mCDR 16 March 2015 No RFAs SOC CDR 16 June 2015 All RFAs concurred iCDR FO 19 November 2015 All RFAs concurred iPER SCM 10 November 2016 1 of 4 RFAs concurred iPER V5 14 November 2016 1 of 9 RFAs complete iPER MEP 2 February 2017 15 of 15 complete (12 concurred) iPER SCM2 7 April 2017 iPSR MEP+ 10 April 2017 iPER V1234 26 April 2017

iCDR RFAs - FIELDS RFA Number Title Requestor Actionee Close Date Concur Date RFA # 1b RFA #1, Part 2 - Thermo-Generated Currents Brian Anderson Keith Goetz 3/31/16 4/4/16 RFA # 2 Scrub and update FIELDS ICDs Jeff Dolan FIELDS 9/23/16 2/2/17  RFA # 3 Review final design of V1-V4 Antenna Clint Apland FIELDS Mechanical 6/11/15 11/16/15 RFA # 4 Additional details on Antenna mechanical design 6/10/15 RFA # 6 Stuctural margin documentation Scott Gordon 8/20/15 9/18/15 RFA # 7 Thermal Properties Bruce Williams Thermal 6/9/15 7/7/15 RFA # 8 Thermal Modeling Matt Reinhart RFA # 9 Include Coax and Harness in Thermal Analysis RFA # 10 V5 Antenna Hot Temperature Predictions 6/29/15 RFA # 11 Heater Switching effect on Science 5/25/15 9/10/15 RFA # 12 Heater Duty Cycle at 24 V 6/15/15 RFA # 13 Proximity of the V1234 Preamp Heaters Thermal Mechanical 2/10/15 2/17/15 RFA # 14 Testing at ORNL Tim Stephenson Mechanical 2/13/15 3/6/15 RFA # 15 Tabulated Materials List for V1234 6/12/15 RFA # 16 FIELDS Interface Temperatures 6/30/15 RFA # 17 Magnetometer In-flight Calibration Plan Bob MacDowall 3/3/15 RFA # 19 Zero-level Magnetic Field 5/27/15 RFA # 21 Stored Commanding Requirement for TDS Mark Reid RFA # 22 LNPS Loading Requirements 4/29/16 5/3/16 RFA # 23 Grounding Ken Wagner 1/30/17   RFA # 24 Sine and Random Vibration Tests for V1234 with Whip 11/10/15 RFA # 27 Flow-down of SMA Requirements for the SCM Teresa James QA 6/8/15 RFA # 28 Software Assurance Plan Peter Harvey 3/9/15 RFA # 29 Configuration Control Plans 2/5/15 RFA # 30 Downlink Plan for Non-ideal Orbits Matt Reinhart for N. Fox 7/6/15 7/20/15 RFA # 31 Detailed Analysis of the Schedule and Budget Chris Stevens 7/8/15 8/17/15

iCDR RFAs - Project RFA Number Title Requestor Actionee Close Date Concur Date RFA # 1A RFA #1, Part 1 - Thermo-Generated Currents Brian Anderson Carl Herrmann 3/31/16 4/4/16 RFA # 5 Evaulate impact of S/C dynamic response for V1234 Scott Gordon Dave Persons 5/13/16 RFA # 18 Formalize the Magnetics Program 10/7/15 3/1/16 RFA # 20 Magnetics Decisions Lena Adams 9/10/15 3/21/16 RFA # 25 Bake-out Temperatures Bruce Williams John Nicols 6/29/15 RFA # 26 First Motion Deployment of V1234 after S/C-Level Sine Vibration and Acoustic Testing Annette Dolbow 4/3/15

iCDR FO RFAs RFA Number Title Requestor Actionee Close Date Concur Date 1 Prior Action Item Status, slide 02-7 Matt Reinhart Keith Goetz 2/1/17 2 Hinge Deployment Time/Velocity Margin, slide 03-19 Deva Ponnusamy Glaser 3/17/16 4/29/16 3 Preamp Coaxial Cable Support, slide 03-28 3/18/16 4 Torque Margin Test Clarification, slides 04-13 through 17 4/6/16 6 Pre-Amp Temperature Change, Systems, slide 06-7 Bruce Williams Millan 3/21/16 7 Pin Puller Temperature, slide 06-7 8 Pin Puller minimum temperature, slides 06-23 and 08-43 9 Materials Thermal Rating, slide 06-25

SCM iPER RFAs Title Requestor Actionee Complete Date Concur Date AI #1 - Unfinished I-CDR action item Doug S. Mehoke Keith Goetz 12/14/16 12/15/16 AI #2 - Thermal testing - Survival test temp Bruce Williams Lora Suther 3/24/17 3/28/17 AI #3 - Steady State Heater Power Allocation   AI #4 - Thermal Balance Test

V5 iPER RFAs Title Requestor Actionee Complete Date Concur Date AI #1 - Unfinished I-CDR action Doug S. Mehoke Keith Goetz 12/13/16 3/21/17 AI #2 - Sporadic oscillation and saturation of V1 sensor (and to a smaller exten Jeff S Dolan John Bonnell 4/9/17 4/10/17 AI #3 - D-subminiature pigtail connector cold temperature rating exceedance. 3/27/17 AI #4 - Belleville washes under antenna fasteners Clint T. Apland David Glaser   AI #5 - Contacts and preamp PWB AI #6 - Thermal Analysis Lora Suther AI #7 - Micro Phase K usage Carl Herrmann 3/20/17 AI #8 - Thermal Balance Test 3/24/17 AI #9 - V5 noise level Kazue Takahashi 2/22/17

MEP iPER RFAs Title Requestor Actionee Complete Date Concur Date AI #1 - Complete CPT Jeff Dolan Keith Goetz 2/16/17 4/3/17 AI #2 - CPT spreadsheet Peter Harvey 2/11/17 AI #3 - Flight Software Susan Ensor 3/15/17 3/16/17 AI #4 - SWEAP Interface definition 2/20/17 AI #5 - LPT AI #6 - FPGA short 3/18/17 AI #7 - Heel fillets on DCB#2 Doug Mehoke Lora Suther 3/9/17 3/17/17 AI #8 - Flight software 2/22/17 AI #9 - No SWEAP I/F testing in CPT performed In TV AI #10 - Hi and Lo Bus voltage testing during TV Bruce Williams AI #11 - Cold Turn on in TV Elisabeth Abel Gayle Martin 4/10/17 AI #12 - No Mag heater testing during CPT during TV AI #13 - Flight harnesses bypassing EMI 2/15/17 AI # 14 - Flight SCM bypassing EMI   AI #15 - MEP performance measures

Waivers/Deviations

Problems UCB Item# Team STATUS Date CLOSED DISPOSITION Title / Description Instrument SubSys Sub Assy 001 UCB CLOSED 5/26/16 1 SPP DCB - 3-D Plus SDL Workmanship FIELDS MEP DCB/RFS 002 LASP 6/1/16 SPP DFB Sidecar ASIC Anomaly DFB SN1 003 4/15/16 SPP AEB testing J32 Digital Input Overvoltage AEB1, AEB2 004 1/9/17 3 DFB LASP 005 006 7/26/16 DCB/AEB HSK Anomaly (DCB Housekeeping Response) DCB/RFS, FM1 007   VOID TBD 008 5 MEP GND 009 10/31/16 DCB FM2 missing R47 DCB/RFS, FM2 010 RFS V1 Input Over-voltage 011 OPEN 4 SCM LF1Y Signal Loss SCM 012 1/7/17 DCB Disconnected +6VA rail 013 1/26/17 DCB Signal Shorted to Ground DCB FM2 014 1//31/17 GSE Short Circuit of 5V AEB1 Regulator AEB1 015 UMN TDS FPGA Daughter Board Alignment Pins TDS 016 3/22/17 TDS Shows Corrupt Data 017 3/30/17 MEP Harness H110 Assembly Error Harness 018 MEP LNPS overvoltage LNPS 019 4/3/17 Whip Lead Weld Cracking Antenna 020 Abnormal E-Field Signal Variation TVAC C6_H6 DFB 021 TDS time series 16k shift when cold 022 TDS Channel 4 D8 failure in cold <next>

Performance MEP works like a charm High reliability F1 alone – F2 alone – F1 first and then F2 – F2 first and then F1 Persistent state No drama In general true from the start We have had some issues and problems Many hundreds of operating hours have been logged Many hundreds of failure free hours on the various subsystems MEP operating hours Starting on 4 January 2017, we have had ~240 operating hours MEP failure free hours We have had a few re-starts to the FFH counter The most recent re-start was March first LNPS1 overvoltage problem Now ~118 + 10 hours

Calibration Co-I hardware institutions have delivered fully calibrated sub-assemblies Fully calibrated and verified at home institutions – to front end Simple calibrations at FIELDS I&T to verify and fill in gaps For example: V1234 PAs, SCM, V5 As FIELDS is integrated at UCB Several verification cals in ambient and at temperature as reference Using external stimuli and/or isolation Using sensor/probe isolation Using flight hardware receivers – RFS, DFB, TDS and MAGs Using flight hardware sensors As FIELDS is integrated with spacecraft at APL Same process Using isolation and stimuli in ambient and S/C TV As FIELDS enters/exits perihelion Using SCM internal cal circuit Calibration S/C rolls Internal antenna bias sweeps

Calibration Sub-assemblies were delivered fully calibrated For example, to receiver front-ends Preliminary end-to-end calibrations from the sensor inputs have been done But not: Using flight harnesses Using flight V1234 preamplifiers in final configuration with antennas Using flight SCM FM2 We propose to repeat the end-to-end calibrations at the S/C level With simple electrical GSE When flight antennas/PAs arrive When flight SCM arrives Can be done late in the APL workday and as time allows

FIELDS Flight Configuration

FIELDS Bench CPT Configuration

FIELDS S/C CPT Configuration