1. MPSRThermal- 1 UCB, Oct 26, 2006 THEMIS MISSION PRE-SHIP REVIEW Thermal Christopher Smith University of California - Berkeley

2. MPSRThermal- 2 UCB, Oct 26, 2006 Thermal Hardware Status Update

3. MPSRThermal- 3 UCB, Oct 26, 2006 Thermal Hardware Status Update

4. MPSRThermal- 4 UCB, Oct 26, 2006 Second Model Correlation Complete All boxes within 5 degrees of test temperatures Thermostat set points verified … except: –IDPU and BAU Primary and Secondary –IRU Primary and Secondary was verified on P5 only Heater duty cycles less than 70% Flight Predicts for launch case are complete The remainder are currently running Thermal Modeling Status

5. MPSRThermal- 5 UCB, Oct 26, 2006 Five PFRs closed since PER PFR-186: Thermal Blanket Velcro Adhesion Failure PFR-205: Fuel Line Zone #1 Secondary Thermostat to Low PFR-215: F3 XPNDR Secondary Setpoints the Same as Primary PFR-225: F3 MSSS Primary and Secondary service switched PFR-226: P1 Thermistors BTMPRCSLN1 and BTMPRCSSVC swapped RFAs P3_PSR_4: Periodic Emissivity Measurements, closed P1_PSR_2: Transponder Radiator Resizing, submitted P1_PSR_3: Test Versus Flight Radiator Heat Flow Comparison, closed P1_PSR_4: Comparison of Pre-test Flight Predicts to Correlated Model, submitted PFRs and RFAs

6. MPSRThermal- 6 UCB, Oct 26, 2006 Test Facilities Testing took place in JPL chamber #7 74”x134” Simultaneously accommodated two Themis probes for testing with chamber divider shroud Gaseous or liquid nitrogen controlled shrouds GN2: –130 to +125 deg C LN2: -175 deg C Two TQCMs Nitrogen Vent-back is rate limited 30 power Supplies 168 Type T thermocouple feedthroughs 250 Channel DAQ system 1000 L/sec Leybold and 2000 L/sec Balser Turbo pumps Tank cleanliness certified prior to T-V test

7. MPSRThermal- 7 UCB, Oct 26, 2006 TVAC Flow for P2

8. MPSRThermal- 8 UCB, Oct 26, 2006 TVAC Flow for P1, P3, P4, and P5

9. MPSRThermal- 9 UCB, Oct 26, 2006 Thermal Vac Configuration P2 Hot Balance #1

10. MPSRThermal- 10 UCB, Oct 26, 2006 Thermal Vac Configuration P1,P3-5 Cold Balance #3

11. MPSRThermal- 11 UCB, Oct 26, 2006 TVAC #2 Setup

12. MPSRThermal- 12 UCB, Oct 26, 2006 TVAC #2 Setup

13. MPSRThermal- 13 UCB, Oct 26, 2006 TVAC #2 Setup

14. MPSRThermal- 14 UCB, Oct 26, 2006 Test Heaters 12 test heaters provided for each thermal box 1 heater for the Antenna Hat Coupler 1 Heater for the Separation Ring 1 heater for controlling the beam warm up

15. MPSRThermal- 15 UCB, Oct 26, 2006 Instrumentation 168 T-type thermocouples used on P2 80 T-type thermocouples used on P1, P3-5 64x2 used on the spacecraft 16x2 used for heaters and environment Transponder fully instrumented Added thermocouples to the RCS system on P3

16. MPSRThermal- 16 UCB, Oct 26, 2006 P2 TVAC Results After 1 st Correlation

17. MPSRThermal- 17 UCB, Oct 26, 2006 TVAC Hot Balance Results Before 2 nd Correlation

18. MPSRThermal- 18 UCB, Oct 26, 2006 TVAC Cold Balance Results Before 2 nd Correlation

19. MPSRThermal- 19 UCB, Oct 26, 2006 Combined Probe Correlation Changes

20. MPSRThermal- 20 UCB, Oct 26, 2006 Combined RCS Correlation Changes

21. MPSRThermal- 21 UCB, Oct 26, 2006 Other Changes Increased transponder radiator size by 30% to match hardware modifications Heater power applied as a function of bus voltage Added heat leak from sun sensor to thermal box corner panel Ran two separate cold balance cases to account for different top plate temperatures in actual test Moved several Thermostat node locations to better reflect as installation photographs Added Thermostat masses on RCS Fuel Lines Heater Zones (12 grams per TSTAT) Removed Line 1 heater service from service valve TSTAT node

22. MPSRThermal- 22 UCB, Oct 26, 2006 TVAC Hot Balance Results After 2 nd Correlation

23. MPSRThermal- 23 UCB, Oct 26, 2006 TVAC Cold Balance Results After 2 nd Correlation

24. MPSRThermal- 24 UCB, Oct 26, 2006 Test Heater Power Summary

25. MPSRThermal- 25 UCB, Oct 26, 2006 TVAC 1 PFR-205, Closed: Fuel Line Zone #1 Secondary Thermostat to Low Heat leak to bottom deck caused TSTAT to appear to be tripping at a low temperature when it was functioning normally. However this exposed a real cold spot in the RCS fuel line 1. Fly As Is. Only presents a problem in long eclipses when the primary heater service has also failed. TVAC 2 and 3 PFR-215, Closed: F3 Transponder Secondary Setpoints the Same as Primary Fly As Is PFR-225, Closed: F3 MSSS Primary and Secondary service switched Fly As Is PFR-226, Closed: P1 Thermistors BTMPRCSLN1 and BTMPRCSSVC swapped Database Updated to swap mnemonics Anomalies During Test

26. MPSRThermal- 26 UCB, Oct 26, 2006 THERMAL BACKUP SLIDES

27. MPSRThermal- 27 UCB, Oct 26, 2006 Thermal Testing History

28. MPSRThermal- 28 UCB, Oct 26, 2006 Thermal Cycle Accumulation Individual Instrument TVAC (2 Cycles) Instrument Suite TVAC (6 Cycles) Individual Probe Component TVAC (8 Cycles) Probe Level TVAC (4 Cycles, 3 Balance Points)

29. MPSRThermal- 29 UCB, Oct 26, 2006 Thermal Vac Testing History Instruments

30. MPSRThermal- 30 UCB, Oct 26, 2006 Thermal Vac Testing History Instruments

31. MPSRThermal- 31 UCB, Oct 26, 2006 Thermal Vac Testing History Suite and IDPU

32. MPSRThermal- 32 UCB, Oct 26, 2006 Thermal Vac Testing History Mag Booms

33. MPSRThermal- 33 UCB, Oct 26, 2006 Thermal Vac Testing History SPB

34. MPSRThermal- 34 UCB, Oct 26, 2006 Thermal Vac Testing History AXB

35. MPSRThermal- 35 UCB, Oct 26, 2006 Thermal Vac Testing History Probe Components

36. MPSRThermal- 36 UCB, Oct 26, 2006 Post TVAC 1 Correlation Changes and Data

37. MPSRThermal- 37 UCB, Oct 26, 2006 P2 TVAC Results Before Correlation Comparison of the test data with test predicts show most components are within 5°C of test predicts for Hot and Cold Balance Cases The Survival Balance Case (Cold 2) results indicate that the model is conservative on the cold side which means that flight heater powers will be less than predicted.

38. MPSRThermal- 38 UCB, Oct 26, 2006 Correlated Interface Conductances

39. MPSRThermal- 39 UCB, Oct 26, 2006 Correlated Blanket e*

40. MPSRThermal- 40 UCB, Oct 26, 2006 Correlated Thermostat Set Points

41. MPSRThermal- 41 UCB, Oct 26, 2006 Other Changes Added Thermostat masses on RCS Fuel Lines Heater Zones (12 grams per TSTAT) RCS Max Heater Power multiplied by 1.375 (Accounts for 33V Bus instead of 24V) Adjusted RCS Latch Valve, P-Ducer and Solenoid Valve MCp values to account for single node model (FAC 0.2). Adjusted Sun Sensor outer face emissivity from 0.2 to 0.8 (accounts for black anodized Baffles)

42. MPSRThermal- 42 UCB, Oct 26, 2006 P2 TVAC Results After Correlation