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Transient Plasma Analyzer for Hypervelocity Impact Studies

Transient Plasma Analyzer for Hypervelocity Impact Studies. Dr. David Lauben January 9, 2013. Introduction. Transient Plasma Analyzer (TPA) Characterize transient low-energy plasma plume Every shot unique: no event repetition, no control Make THIN! (< 5mm) to allow side-panel mount.

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Transient Plasma Analyzer for Hypervelocity Impact Studies

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  1. Transient Plasma Analyzerfor Hypervelocity Impact Studies Dr. David Lauben January 9, 2013

  2. Introduction Transient Plasma Analyzer (TPA) • Characterize transient low-energy plasma plume • Every shot unique: no event repetition, no control • Make THIN! (< 5mm) to allow side-panel mount Simplified Concept (Solar Panel Targets) Early Concept (Deployable Target)

  3. Build on previous success! • Simple Retarding Potential Analyzer • Concept to working unit in < 30 days • 1st unit fab: ~3 days; 2nd unit: 1 day!

  4. Introduction • Initial Concept (c.f. Enloe et al., 2003)

  5. Improvement • Revised “C” Aperture (best efficiency) (comsol model)

  6. 3D Trajectory Simulation • Accepted particles

  7. 3D Trajectory Simulation • Rejected particles low energies reflect high energies miss collector ^ isolation shield needed here

  8. Response vs Energy, Angle normal  incidence non-ideal, but accept

  9. Fabrication • “All PCB” design (4 layer + 2 layer) PCB stack-up, confirmed w/supplier 3D rendering from PCB cad package

  10. TPA Design Summary • “All PCB” flat-panel Transient Plasma Analyzer • c.f., AFIT: MESA, iMESA (ISS/MISSE-7), PCBSAT • 12x12 mm-scale micro-electrostatic analyzers • (8) clusters of 9 cells/cluster, for (8) e- energy bands • (8) clusters of 9 cells/cluster, for (8) ion energy bands • Commandable bias voltage for energy selection • Ex: unbiased target: V = 0.5, 1, 2, 5, 10, 20, 50, 100+ • Ex: biased target: V = 5, 10, 20, 50, 100, 200, 500+ • Option (at fabrication) for extreme bandwidth • Default: BW > 10 MHz using standard COTS electronics • Option: BW > 1 GHz using latest UWB high-fTdiscretes • Data as raw, or onset + time-over-threshold mode

  11. TPA Development Plan • Ground Tests (Stanford) • Calibrate using standard low-energy e-, ion sources • Simulate HVI events via nanosecond, microjoulelaser • Plasma production, RF emission, Sensor Response • Ground HVI Experiments(LASP) • Measure hypervelocity (>20 km/s), femtogram projectiles • Verify computer models: Plasma, RF, Chamber, Sensors • Prototype Test Flight • Low-earth orbit plasma environment • Science Missions! • True in-situ micrometeoroid distribton Accurate Chamber Effects Model

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