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Particles and Fields Package Pre-Ship Review 2 - STATIC November 19, 2012

Mars Atmosphere and Volatile EvolutioN (MAVEN) Mission. Particles and Fields Package Pre-Ship Review 2 - STATIC November 19, 2012 7 - SWEA (Solar Wind Electron Analyzer) D. L. Mitchell and the SWEA Team. Progress on Discharges (PFR 059). Spare board (HVPS-A) promoted to Flight

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Particles and Fields Package Pre-Ship Review 2 - STATIC November 19, 2012

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  1. Mars Atmosphere and Volatile EvolutioN (MAVEN) Mission Particles and Fields Package Pre-Ship Review 2 - STATIC November 19, 2012 7 - SWEA (Solar Wind Electron Analyzer) D. L. Mitchell and the SWEA Team

  2. Progress on Discharges (PFR 059) • Spare board (HVPS-A) promoted to Flight • 24 hours of operation, 39 MCP HV ramps, no discharges • Reworked for flight (harness redressed, some parts replaced) • Now integrated with the rest of the FM • We will continue diagnosing HVPS-B (now the Spare) • Preamp-C built up with new PCB and all new parts. • Bench and chamber tested. • Now integrated with the rest of the FM • Complete FM in the Cal chamber for thorough functional • CPT • Multiple MCP HV ramps • Functional testing with electron beam (analyzer, deflectors, V0)

  3. Progress SWEA TVAC Issues(PFR 122) • Redesigned top cap closing mechanism so it does not close all the way • 0.5 mm gap when cover is “closed” • No contact with outer hemisphere during vibe/launch • No gasket • Outer hemisphere was inspected with SEM • Rubbed area composed of Cu and S, with a trace of Se. • Consistent with burnished Cu2S blacking  NO exposed Al. • We can proceed with existing parts • Increased purge flow (26 SLH) to compensate for gap • Instrument fully disassembled and cleaned to remove particulates • Analyzer carefully inspected during reassembly • MCP’s and MCP mounting hardware inspected under microscope • Instrument passed electrical resistance/continuity tests during assembly and bench functional after assembly

  4. SWEA – Plan Forward Nov 17-18 Flight-like build (all except final staking) Nov 19 Chamber functional, verify no major calibration changes Nov 20 Vibe Nov 21 Package I&T Nov 22 Thanksgiving (day off) Nov 23-25 Chamber functional, verify no major calibration changes Nov 26 - Dec 4 Thermal Vac (8 cycles) Dec 5-13 Post-environments calibration Dec 14 Deliver

  5. SWEA – Top Cap Design Change Sleeves added to bear load in closed position. CLOSED OPEN

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