Jarred Alexander Young October 22, 2012

 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

QuantityBias (V)Power Supply Bias above/below ground (V) Anode/Beam Voltage (AN) 250A0150NX05 (x2)+250 Discharge (DC)70A0100MX Emitter Filament (EF) 10A20H Accel Grid (AC)290N01HA Neutralizer Filament (NF) 10 (?)HY3010E-3+10 Electrical Set-up for 5000 s ISP beam

 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 + +

 Test Variables  Main Emitter Filament Current (4.5, 5, 5.5 A)  Discharge Voltage (30-70 V)  Accelerator Grid Voltage ( V) ▪ 290 V 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

 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