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High Energy Plume Impingement on Spacecraft Systems: Analysis, Testing, and Material Results

This report discusses beam analysis, beam testing results, material testing, and future work related to the impact of high-energy plume impingement on spacecraft systems, including energy levels, beam current, current density, flux level, and material damage assessments.

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High Energy Plume Impingement on Spacecraft Systems: Analysis, Testing, and Material Results

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  1. High Energy Plume Impingement on Spacecraft SystemsAFOSR Telecon Jarred Alexander Young February 26, 2013

  2. Current Events • Beam Analysis • Looked at energy peaks for varying anode voltages • Looked at current extraction capabilities as function of • Discharge Voltage • Accel Grid Voltage • Examined beam current as function of radial position • Performed sample testing at two different energy levels for 8 samples • Fixed all remaining ion engine glitches

  3. Beam Testing

  4. Beam Testing

  5. Beam Testing

  6. Beam Testing

  7. Beam Testing Picoammeter switching

  8. Beam Testing Results • Energy Range: 95-259 eV • Beam Current • Max recorded: 3.5 μA (RPA) • Current should scale as ~(90mm/5mm)2 • Calculated total beam current: 1.134 mA • Calculated Current Density: 0.18 μA/mm2 • Calculated Flux Level: 1.11E18 #/m2-s • Accel bias has strong effect on beam current extraction • Discharge bias has moderate effect on current extraction, but may help improve beam focus

  9. Material Testing • Performed plume exposure tests on Si coupons • Test Parameters • Energy levels: 150 & 250 eV • Exposure times comparable to deposition of 50, 100, or 150 monolayers • Distance from Beam Exit: ~2 cm • Scanned samples for Argon and Tungsten atoms

  10. Material Testing • Scanned coupons with Hitachi SU-70 Field SEM machine w/EDS • All 150 eV samples didn’t show any notable damage

  11. Material Testing Results • Showed that samples may be doped with Argon • Data not conclusive until EDS scan of control sample is performed • Surface is relative undamaged from 150 eV for those exposure times

  12. Future Work • Finish sample SEM scans and ship samples to ISU • Perform axial beam data collection • Looking at distance from engine vs. energy distribution • Compile data for PSU ion engine simulation

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