1. Space Environment and Satellite Systems Transient Plasma Analyzer for 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 1 Early Concept (Deployable Target) Simplified Concept (Solar Panel Targets)

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

4. Introduction Initial Concept (c.f. Enloe et al., 2003) 3

5. Improvement Revised “C” Aperture (best efficiency) 4 (comsol model)

6. 3D Trajectory Simulation Accepted particles 5

7. 3D Trajectory Simulation Rejected particles 6 low energies reflecthigh energies miss collector ^ isolation shield needed here

8. Response vs Energy, Angle 7 normal  incidence non-ideal, but accept

9. Fabrication “All PCB” design (4 layer + 2 layer) 8 3D rendering from PCB cad package PCB stack-up, confirmed w/supplier

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-fT discretes Data as raw, or onset + time-over-threshold mode 9

11. TPA Development Plan 10 Ground Tests (Stanford) Calibrate using standard low-energy e-, ion sources Simulate HVI events via nanosecond, microjoule laser 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