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High Energy Plume Impingement on Spacecraft Systems AFOSR Telecon

High Energy Plume Impingement on Spacecraft Systems AFOSR Telecon. Jarred Alexander Young October 22, 2012. Electrical Issues. All components biased relative to ground May prevent beam generation Beam Diagnostics thrown off by Decel Grid Bias

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High Energy Plume Impingement on Spacecraft Systems AFOSR Telecon

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  1. High Energy Plume Impingement on Spacecraft SystemsAFOSR Telecon Jarred Alexander Young October 22, 2012

  2. Electrical Issues • All components biased relative to ground • May prevent beam generation • Beam Diagnostics thrown off by Decel Grid Bias • Solution: Convert to generic Ion Engine electrical configuration

  3. Electrical Set-up for 5000 s ISP beam

  4. Beam Diagnostic Testing • Beam analysis using FC-71A RPA/Faraday Cup • Mounted in center of engine beam • Determines • Beam Current • Ion Density • Ion Flux • Beam Energy • Goal • To develop a matrix of possible test settings and corresponding fluence times + +

  5. Beam Diagnostic Test Plan • Test Variables • Main Emitter Filament Current (4.5, 5, 5.5 A) • Discharge Voltage (30-70 V) • Accelerator Grid Voltage (100-290 V) • 290V corresponds to 5000 s ISP • Beam I-V Curves • Take I-V Curves from every point in text matrix • Calculate Ion Density and Flux • Take derivative w.r.t. Voltage to find Beam Energy Distribution • Compile energy distribution data

  6. Upcoming Tasks • Conduct beam testing and analysis • Design mount for material coupons • Procure Equipment • Filament power supply should arrive by mid-week • Diagnostic Equipment • Keithley 2410 Sourcemeter in by end of week • Keithley 6485 Picoammeter status unknown

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