MAVEN PER May 23-25, 2011 Particles and Fields Package Pre-Environmental Review May , 2012 Thermal Millan F. Diaz-Aguado Mars Atmosphere and Volatile EvolutioN (MAVEN) Mission

1-2 MAVEN PER May 23-25, 2011 Thermal PER Outline Thermal Design Update Thermal Analysis Status –CDR RFA’s –Changes since CDR –Assumptions (Environmental Loads, Power Dissipation, Optical Properties) Goddard Thermal Golden Rules Test Temperatures Thermal Analysis Status and Results Thermal Status General Thermal Balance and Thermal Vacuum Test Plans Thermal Facilities Facilities Schedule Documentation Other Thermal Testing

1-3 MAVEN PER May 23-25, 2011 Thermal Design Update Changes since CDR –LPW Reduced operational heater set-point to -15ºC (old set-point 0ºC) –PFDPU Wet mount to S/C No survival heater necessary –SEP Reduced operational heater set-point to -45ºC (old set-point -35ºC) –STATIC Thermally coupled to APP through eGRAF Radiator is now white paint (Z93 C55), previously black nickel –SWEA Reduced radiator size, increased MLI Radiator is now white paint (Z93 C55), previously black nickel –SWIA Increased radiator size and thermally coupled to S/C through eGRAF Radiator is now white paint (Z93 C55), previously black nickel *Radiators Painted at NASA Goddard **eGRAF donated by NASA Goddard

1-4 MAVEN PER May 23-25, 2011 CDR RFA’s RFA001 – Thermal Optical Properties: Closed RFA002 – Thermal Analysis Reports: Closed RFA003 – Thermal cycling of LPW: Closed RFA009 – Heater duty cycle may exceed GSFC Gold Rule of 70%: Closed

1-5 MAVEN PER May 23-25, 2011 Thermal Analysis Status Coordination with Lockheed Martin –Closely working with LM, Marc Church and Bret Sharp –Meetings led by Dan Powers –Delivered PF model to LM for incoporation into S/C –Received S/C model from LM for analysis use –Updated PF Instruments in model Analysis Cases Run –Running all cases from S/C model (Acquisition, Cruise, MOI, Science, Deep Dips and Relay) –Not running launch cases

1-6 MAVEN PER May 23-25, 2011 Power Dissipation Assumptions Hot Case – Measured power dissipation Cold Case- Measured power dissipation -10% SubsystemHot Case Heat Load (W) Cold Case Heat Load (W) LPW-Preamp PFDPU SEP STATIC SWEA SWIA

1-7 MAVEN PER May 23-25, 2011 Contact Subsystem to S/C SubsystemContact Conductance (W/C) Contact Type LPW0.013G10 isolators PFDPU4.6Wet mount (LM) SEP0.011Ultem 1000 isolators STATIC2eGRAF SWEA0.013G10 isolators SWIA2eGRAF

1-8 MAVEN PER May 23-25, 2011 Environmental Loads Values above from LM Case Sets Phase Solar Flux (W/m 2 )AlbedoIR (K)Aero MinMaxMinMaxMinMax Flux (W/m 2 ) Time (min) Launch Cruise MOI Mars Deep Dip

1-9 MAVEN PER May 23-25, 2011 Optical Properties All Materials approved by GSFC and JPL on previous missions Clear Alodine done by one plater with specified soak time. Extensive sampling with THEMIS. Occasional sampling with other missions. Wide BOL/EOL variance assumed in design Material Name BOLEOL Source εαα/εεα Clear Alodined Aluminum Testing, UCB Specified Process Germanium Black Kapton Heritage Testing Electroless Nickel STCH DAG Testing, EOL after 2.1e20 atoms/cm 2 AO fluence Testing, EOL after 9.3e20 atoms/cm 2 AO fluence Ebanol C Testing, EOL after 9.3e20 atoms/cm 2 AO fluence Titanium Nitride Heritage Testing Black Nickel (LPW) Testing, EOL after 9.3e20 atoms/cm 2 AO fluence Black Nickel Testing, UCB Specified Process Z-93-C GSFC

1-10 MAVEN PER May 23-25, 2011 Thermal Golden Rules Predicted Temperature +5 ºC +10 ºC +15 ºC -5 ºC -10 ºC -15 ºC AFT FA PF If Heater Controlled PT AFT FA PF

1-11 MAVEN PER May 23-25, 2011 Temperature Limits PF Max/Min are +/-10ºC more than AFT All instruments will be tested to PF * Heater Controlled Instrument Operating Temperatures (°C)Non Operating Temperatures (°C) AFT MinAFT MaxFA MinFA MaxPF MinPF MaxAFT MinAFT MaxPF MinPF Max PFDPU MAG LPW_PREAMP Pre Deployment LPW_DEPLOYMENT_MECH Pre Deploy LPW_DEPLOYMENT_MECH Deployment LPW-EUVM STATIC SWEA SWIA SEP

1-12 MAVEN PER May 23-25, 2011 Operational Analysis Smallest Temperature Margins (ºC) Thermal Cruise InstrumentMargin (Cold)Margin (Hot) LPW1_Preamp LPW2_Preamp DPU_Box STA_Box SWE_Box SWI_Box SEP1_Box SEP2_Box Science InstrumentMargin (Cold)Margin (Hot) LPW1_Preamp LPW2_Preamp DPU_Box STA_Box SWE_Box SWI_Box SEP1_Box SEP2_Box Deep Dip InstrumentMargin (Cold)Margin (Hot) LPW1_Preamp LPW2_Preamp DPU_Box STA_Box SWE_Box SWI_Box SEP1_Box SEP2_Box InstrumentMargin (Cold)Margin (Hot) LPW1_Preamp LPW2_Preamp DPU_Box STA_Box SWE_Box SWI_Box SEP1_Box SEP2_Box Relay InstrumentMaxMin LPW1_Preamp LPW2_Preamp DPU_Box40-20 STA_Box40-30 SWE_Box40-30 SWI_Box40-30 SEP1_Box0-50 SEP2_Box0-50 AFT Pending change of ERD

1-13 MAVEN PER May 23-25, 2011 Survival Analysis Smallest Temperature Margins (ºC) Thermal Non Operational Temperatures InstrumentMaxMin LPW1_Preamp LPW2_Preamp DPU_Box50-20 STA_Box40-30 SWE_Box40-30 SWI_Box40-30 SEP1_Box45-55 SEP2_Box45-55 AFT InstrumentMargin (Cold)Margin (Hot) LPW1_Preamp LPW2_Preamp DPU_Box STA_Box SWE_Box SWI_Box SEP1_Box SEP2_Box ºC above AFT - MOI, Cruise Safe Mode, Science Safe Mode and Acquisition

1-14 MAVEN PER May 23-25, 2011 LPW Temperatures Thermal Before Deployment (non operational) Deployment (operational) After Deployment (non operational) AFT MARGIN ComponentHOTCOLDMargin (Cold)Margin (Hot) ULPW1_WHIP ULPW2_WHIP ULPW1_STACER ULPW2_STACER ULPW1_DEPLOYMENT_MECH ULPW2_DEPLOYMENT_MECH Break Golden Rules AFT MARGIN ComponentHOTCOLDMargin (Cold)Margin (Hot) ULPW1_WHIP ULPW2_WHIP ULPW1_STACER ULPW2_STACER ULPW1_DEPLOYMENT_MECH ULPW2_DEPLOYMENT_MECH AFT MARGIN ComponentHOTCOLDMargin (Cold)Margin (Hot) ULPW1_WHIP ULPW2_WHIP ULPW1_STACER ULPW2_STACER ULPW1_DEPLOYMENT_MECH ULPW2_DEPLOYMENT_MECH Note: Heater non-operational

1-15 MAVEN PER May 23-25, 2011 Thermal Analysis Status Thermal Operational5004_Cold_Eclip_Sci_Type1_Orbit Size Maximum Individual (all op. cases)MaximumMaximum IndivodualMargin Heater(Ω)(Ω)(W) (% Duty STA_Box SWE_Box SWI_Box SEP1_Box_ SEP2_Box_ Total Maximum Orbit Average (W) 11.7 Survival5050_Science_Safe_Mode Size Maximum Individual (all survival cases)Maximum CaseMaximum IndividualMargin Heater(Ω)(Ω)(W) (% Duty STA_Box SWE_Box SWI_Box SEP1_Box_ SEP2_Box_ Total Maximum Orbit Average (W) 15.7 Heater Power Budget Size Margin Heater(Ω)(Ω)(W) (% Duty LPW_1* LPW_2* LPW Deployment *Setpoint decreased to -15ºC (from 0ºC) Need at least 30% Duty Cycle Margin on Individual Heaters

1-16 MAVEN PER May 23-25, 2011 Thermal Status LPW –Heaters installed and verified PFDPU –Black Anodized SEP –Painted, heaters in stock, Ultem in stock STATIC –Radiator painted, heaters in stock, eGRAF in stock SWEA –Radiator painted, heater in stock, G-10 in stock SWIA –Radiator painted, heaters installed and verified, eGRAF in stock

1-17 MAVEN PER May 23-25, 2011 Thermal Vacuum,Thermal Balance and Bakeout Survival Cycle –Thermal Vacuum first cycle (SWIA, STATIC, SWEA have the same survival/operational temperatures) –Heater functional at first survival cold cycle Thermal Balance* –Extended hot/cold soak on a Thermal Vacuum cycle at operational temperature Break vacuum if necessary to uninstall thermal isolators (SEP, SWEA) after TB Thermal Vacuum cycling –Eight Cycles –Ramp rates between 1ºC/min and 2ºC/min. –Soak times 4 hours within 3ºC from plateau (or less than 1ºC/hr. temperature change) –Heater functional at first operational cold cycle Bakeout –Extend last cycle to obtain 48 hours of bakeout at high temperature Flight MLI will be used during testing during thermal vacuum tests –STATIC, SEP, SWEA will have flight MLI blankets (*Thermal Balance) –LPW and SWIA will not have MLI blankets and will not be thermally balanced at instrument level –PFDPU does not have an MLI blanket and will not be thermally balanced at subsystem level

1-18 MAVEN PER May 23-25, 2011 Thermal Vacuum/Balance/Bakeout Profile Survival/Balance* Cycle Operational Cycle Bakeout Survival Heater Functional Operational Heater Functional Turn on, TB Turn on/off Turn off Chamber Break

1-19 MAVEN PER May 23-25, 2011 Bay Side –Pressure range: down to 1e-6 Torr –Temperature range: -60ºC to 90ºC –Transition rates 1 to 2ºC/min –Clean room access and ESD benches –Interlock, fail-safe valves –TC Channels – 16, silicon diode reference –Currently with 6 DB-25 ports (configurable) –Over-temperature alarms –Liquid nitrogen cooled –Used for THEMIS –TQCM available –Nitrogen gas backfill Snout 1 and 2 –Pressure range: down to 1e-6 Torr –Transition rates 1 to 2ºC/min –Temperature range: -70ºC to 90ºC Small cold finger down to -180ºC –TC Channels – 32, silicon diode reference –Currently with 5 DB-25 ports (configurable) –Clean tent access –Over-temperature alarms –Liquid nitrogen cooled –Used for THEMIS, RBSP –TQCM available on Snout 2 –Nitrogen gas backfill Bertha –Backup, larger chamber Thermal Facilities

1-20 MAVEN PER May 23-25, 2011 T-Vac Chamber Instrument Interface Thermal SWIA STATIC

1-21 MAVEN PER May 23-25, 2011 Test will be considered successful if the following criteria are met: –Completion of the thermal balance testing and collection of all data –Thermal engineer approval of balance data vs. model predicts –Successful performance of each CPT and LPT –Proper functionality of all survival and operational heater circuits –Passing a post-test inspection –No loss of functionality observed such as changes in: Instrument or component power draw Detector signals or noise levels Instrument thermal performance Pass Criteria

1-22 MAVEN PER May 23-25, 2011 Thermal Balance and Thermal Vacuum Document Status InstrumentDocumentDocument Status SEPMAVEN_SEP_091_Thermal_Vacuum_TestDraft STATICMAVEN_STATIC_PROC_049_Thermal_Vacuum_TestCompleted SWIAMAVEN_SWIA_048_Thermal_Vacuum_TestCompleted SWEAMAVEN_SWEA_086_Thermal_Vacuum_TestCompleted LPWMAVEN_PFP_LPW_PLAN_0198_LPW_Preamp_FM_Thermal_Cycling_Test MAVEN_PFP_LPW_029_Stacer_TV_Test_Procedure MAVEN_PFP_LPW_043_Whip_IF_Thermal_Test_Procedure MAVEN_PFP_LPW_044_Whip_Thermal_Cycling_Test_Procedure MAVEN_PFP_LPW_045_Stacer_Harness_Thermal_Test_Procedure Completed Draft PFDPUMAVEN_PF_TP_044_PFDPU_Thermal_Vac_TestDraft

1-23 MAVEN PER May 23-25, 2011 Facilities Schedule JulyAugust Chamber Bay Side Snout 1 Bertha Backup Chamber Snout 2 LPW SWEASEP SWIA STATIC Subsystem or Instrument PFDPU

1-24 MAVEN PER May 23-25, 2011 Other Thermal Testing Heater Installation Verification –IR image of functional heater post installation

1-25 MAVEN PER May 23-25, 2011 June Work Prepare chambers by July –Assemble clean tent for Snout 1-2 –Clean clean-room for Bayside chamber –Build GSE feed-throughs –Bakeouts of chambers Thermal Balance Model Finalize TC locations Finish thermal vacuum documentation

1-26 MAVEN PER May 23-25, 2011 Summary Heater budget well understood Temperatures understood, maybe some modifications needed to tests limits Documents are in draft form, need to complete Testing chambers scheduled and available Preparations needed for testing

1-27 MAVEN PER May 23-25, 2011 Back Up Slides

1-28 MAVEN PER May 23-25, 2011 STATIC Thermal Design Thermal White Paint MLI Heaters (under MLI) Black Nickel MLI Cotherm (8W/C)

1-29 MAVEN PER May 23-25, 2011 Area Painted White: in² Area Painted White in Model: in² –Just changed the area painted (previously 20 in²) Thermal Design – STATIC Radiator Thermal

1-30 MAVEN PER May 23-25, 2011 SWIA Thermal Design Thermal White Paint MLI Heaters (under MLI) Black Nickel MLI Cotherm (8W/C)

1-31 MAVEN PER May 23-25, 2011 Area Painted White: in² Area Painted White in Model: 16.4 in² (previously 14.1 in²) Thermal Design - SWIA Radiator Thermal

1-32 MAVEN PER May 23-25, 2011 SWEA Thermal Design Thermal White Paint MLI Heaters Inside Black Nickel MLI G10 – Standoffs (0.52 W/C)

1-33 MAVEN PER May 23-25, 2011 Actual radiator is ½ of the cylindrical surface: 9.75 in² Model radiator is 9.7 in² Thermal Design - SWEA Radiator Thermal

1-34 MAVEN PER May 23-25, 2011 LPW Thermal Design Thermal DAG213 LPW Black Nickel Titanium Nitride Wet Contact (8W/C) Heater For Deployment Only 0.3 (W/C)

1-35 MAVEN PER May 23-25, 2011 SEP Thermal Design Thermal MLI White Paint Heater (inside cover) White Paint Ultem Standoffs (0.33W/C)

1-36 MAVEN PER May 23-25, 2011 PFDPU Thermal Design Thermal Black Anodize Wet Mount (NuSil?) (4.6W/C)

1-37 MAVEN PER May 23-25, 2011 Sheet:NodeInfo 2001_Hot_Early_Cruise62SOP 2012_Cold_Late_Cruise_9SOP 2013_Cold_Late_Cruise_45SOP Parameter:Red HighRed LowMinMaxMinMaxMinMax Node/Group [°C] LPW1_Preamp LPW2_Preamp LPW1_Depl_Mech LPW2_Depl_Mech DPU_Box STA_Box SWE_Box SWI_Box SEP1_Box SEP2_Box Cruise Temperatures Thermal

1-38 MAVEN PER May 23-25, 2011 Science Temperatures Thermal Sheet: 5001_Cold_Science_Earth_Comm 5004_Cold_Eclip_Sci_Type1_Orbit 5010_Hot_Science_Earth_Com 5014_HotNo_Eclips_Sci_Type1 Parameter:MinMaxMinMaxMinMaxMinMax Node/Group [°C] LPW1_PREAMP LPW2_PREAMP LPW1_DEPL_MECH LPW2_DEPL_MECH DPU_Box STA_Box SWE_Box SWI_Box SEP1_Box SEP2_Box *SEP is heater controlled

1-39 MAVEN PER May 23-25, 2011 Deep Dip Temperatures Thermal Sheet:NodeInfo 6001_Hot_Deep_Dip_pZ 6002_Hot_Deep_Dip_mZ 6003_Hot_Deep_Dip_pY 6004_Hot_Deep_Dip_mY 6005_Hot_Deep_Dip_pX 6006_Hot_Deep_Dip_mX Parameter:Red HighRed LowMinMaxMinMaxMinMaxMinMaxMinMaxMinMax Node/Group [°C] LPW1_PREAMP LPW2_PREAMP LPW1_DEPL_MECH LPW2_DEPL_MECH DPU_Box STA_Box SWE_Box SWI_Box SEP1_Box SEP2_Box

1-40 MAVEN PER May 23-25, 2011 Relay Temperatures Thermal Sheet: 7001_Cold_Science_Relay 7010_Hot_Science_Relay Parameter:MinMaxMinMax Node/Group [°C] LPW1_Preamp LPW2_Preamp LPW1_Depl_Mech LPW2_Depl_Mech DPU_Box STA_Box SWE_Box SWI_Box SEP1_Box SEP2_Box

1-41 MAVEN PER May 23-25, 2011 Safe Modes and Instruments Powered Off Temperatures Thermal Sheet: 3001_Hot_MOI_Open 3003_Hot_MOI_Close 3004_Cold_MOI_Open 3006_Cold_MOI_Close 1001_Init_Acquis_Open 1002_Init_Acquis_Close 2050_Cruise_Safe_Mode 5050_Science_Safe_Mode Parameter:MinMaxMinMaxMinMaxMinMaxMinMaxMinMaxMinMaxMinMax Node/Group [°C] LPW1_Preamp LPW2_Preamp LPW1_Depl_Mech LPW2_Depl_Mech DPU_Box STA_Box SWE_Box SWI_Box SEP1_Box SEP2_Box *SWIA 1.9 ºC above AFT in 1002 Initial Acquisition

1-42 MAVEN PER May 23-25, 2011 Cruise Heater Power Thermal Sheet: 2001_Hot_Early_Cruise62SOP2002_Hot_Early_Cruise45SOP 2012_Cold_Late_Cruise_9SOP 2013_Cold_Late_Cruise_45SOP Parameter:Size Maximum Average Power Max Duty CyclePeak Maximum Average Power Max Duty CyclePeak Maximum Average Power Max Duty CyclePeak Maximum Average Power Max Duty CyclePeak Heater(W) (%)(W) (%)(W) (%)(W) (%)(W) STA_Box % %1.91 SWE_Box % %1.12 SWI_Box %1.1100%0 SEP1_Box %000%0 SEP2_Box % %1.2

1-43 MAVEN PER May 23-25, 2011 Science Heater Power Thermal Sheet: 5001_Cold_Science_Earth_Comm 5004_Cold_Eclip_Sci_Type1_Orbit 5010_Hot_Science_Earth_Com 5014_HotNo_Eclips_Sci_Type1 Parameter:Size Maximum Average Power Max Duty Cycle Peak Power Maximum Average Power Max Duty Cycle Peak Power Maximum Average Power Max Duty Cycle Peak Power Maximum Average Power Max Duty Cycle Peak Power Heater(W) (%)(W) (%)(W) (%)(W) (%)(W) STA_Box SWE_Box SWI_Box SEP1_Box SEP2_Box

1-44 MAVEN PER May 23-25, 2011 Deep Dips Heater Power Thermal Sheet: 6001_Hot_Deep_Dip_pZ 6002_Hot_Deep_Dip_mZ 6003_Hot_Deep_Dip_pY 6004_Hot_Deep_Dip_mY 6005_Hot_Deep_Dip_pX 6006_Hot_Deep_Dip_mX Parameter:Size Maximum Average Power Max Duty Cycle Peak Power Maximum Average Power Max Duty Cycle Peak Power Maximum Average Power Max Duty Cycle Peak Power Maximum Average Power Max Duty Cycle Peak Power Maximum Average Power Max Duty Cycle Peak Power Maximum Average Power Max Duty Cycle Peak Power Heater (W) (%)(W) (%)(W) (%)(W) (%)(W) (%)(W) (%)(W) STA_Box SWE_Box SWI_Box SEP1_Box SEP2_Box

1-45 MAVEN PER May 23-25, 2011 Relay Heater Power Thermal Sheet: 7001_Cold_Science_Relay 7010_Hot_Science_Relay Parameter:Size Maximum Average Power Max Duty CyclePeak Maximum Average Power Max Duty CyclePeak Heater(W) (%)(W) (%)(W) STA_Box SWE_Box SWI_Box SEP1_Box SEP2_Box

1-46 MAVEN PER May 23-25, 2011 Survival Heater Power Thermal Cases 1001 and 1002 do not need any heater power Sheet: 3001_Hot_MOI_Open 3003_Hot_MOI_Close 3004_Cold_MOI_Open 3006_Cold_MOI_Close 2050_Cruise_Safe_Mode 5050_Science_Safe_Mode Parameter:Size Maximum Average Power Max Duty Cycle Peak Power Maximum Average Power Max Duty Cycle Peak Power Maximum Average Power Max Duty Cycle Peak Power Maximum Average Power Max Duty Cycle Peak Power Maximum Average Power Max Duty Cycle Peak Power Maximum Average Power Max Duty Cycle Peak Power Heater(W) (%)(W) (%)(W) (%)(W) (%)(W) (%)(W) (%)(W) STA_Box SWE_Box SWI_Box SEP1_Box SEP2_Box