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MAVEN Particles and Fields CDR RFA Response Chris Smith

MAVEN Particles and Fields CDR RFA Response Chris Smith. MAVEN-PF-CDR-RFA-001. Title : Thermo-Optical Properties Reviewer: Eric Grob Action:

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MAVEN Particles and Fields CDR RFA Response Chris Smith

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  1. MAVEN • Particles and Fields CDR • RFA Response • Chris Smith

  2. MAVEN-PF-CDR-RFA-001 • Title : Thermo-Optical Properties • Reviewer: Eric Grob • Action: • Confirm that GSFC Coatings Committee has blessed the thermal properties for the critical Z93C55 white paint and the Germanium Black Kapton MLI outer layer • Rationale: • Very different values used by SC and P&F for the same white paint (Z93C55) resulting in very different EOL performance…..I doubt they are both correct ? • Response: • Agreed. See below for a survey of properties to date. The UCB thermal model has been updated to use BOL: α=0.13, ε=0.94 and BOL: α=0.45, ε=0.88 which is conservative for the MAVEN mission, maybe too conservative. We will be submitting our own samples for AO testing and will get a blessing from GSFC on out thermal properties for both the white paint and GeBk.

  3. MAVEN-PF-CDR-RFA-001 Estimated Completion Dates: Model Updated to Conservative Values: complete GSFC Blessing on Optical Properties: 08/01/11 Sample Complete Testing: 09/01/11

  4. MAVEN-PF-CDR-RFA-002 • Title : Thermal Analysis Reports • Reviewer: Eric Grob • Action: • Provide the thermal analysis reports for the various boards in the PFDPU and the instruments themselves. • Rationale: • Different institutions are responsible for the boards in the PFDPU; UC Berkeley has one person doing the analysis for the boards within the instruments themselves. No board/card level thermal analysis was shown at this CDR to document the design meets the EEE-INST-0002 de-rated limits at protoflight unit temperatures. Nothing in the back-up charts. The PFDPU level results presented on Wednesday use a coarser detail than these board level models and I would like to review them. The MAVEN project must also review them and deal with any waivers/deviations that might result. • Response: • Detailed thermal analysis will not be run on all 24 boards but will be limited to those boards with a watt density of 100 W/m2. This equates to the 4 highest dissipation boards in the PFDPU and may also include some of the instrument boards. All other boards will be analyzed as well but using a simpler distributed property model. Results in the form of board and component temperatures will be provided as well as a description, similar to CDR, of each board model. • All board designs will be reviewed by the thermal engineer before going to layout. • Estimated Completion Date: 08/01/11

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