Jarred Alexander Young October 22, 2012. All components biased relative to ground May prevent beam...
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Transcript of Jarred Alexander Young October 22, 2012. All components biased relative to ground May prevent beam...
![Page 1: Jarred Alexander Young October 22, 2012. All components biased relative to ground May prevent beam generation Beam Diagnostics thrown off by Decel.](https://reader035.fdocuments.net/reader035/viewer/2022080917/56649ee75503460f94bf80f8/html5/thumbnails/1.jpg)
High Energy Plume Impingement on Spacecraft Systems
AFOSR Telecon
Jarred Alexander YoungOctober 22, 2012
![Page 2: Jarred Alexander Young October 22, 2012. All components biased relative to ground May prevent beam generation Beam Diagnostics thrown off by Decel.](https://reader035.fdocuments.net/reader035/viewer/2022080917/56649ee75503460f94bf80f8/html5/thumbnails/2.jpg)
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
![Page 3: Jarred Alexander Young October 22, 2012. All components biased relative to ground May prevent beam generation Beam Diagnostics thrown off by Decel.](https://reader035.fdocuments.net/reader035/viewer/2022080917/56649ee75503460f94bf80f8/html5/thumbnails/3.jpg)
Quantity Bias (V) Power SupplyBias
above/below ground (V)
Anode/Beam Voltage (AN)
250A0150NX05
(x2)+250
Discharge (DC) 70 A0100MX25 +180
Emitter Filament (EF)
10 A20H950 +170
Accel Grid (AC) 290 N01HA30 -290
Neutralizer Filament (NF)
10 (?) HY3010E-3 +10
Electrical Set-up for 5000 s ISP beam
![Page 4: Jarred Alexander Young October 22, 2012. All components biased relative to ground May prevent beam generation Beam Diagnostics thrown off by Decel.](https://reader035.fdocuments.net/reader035/viewer/2022080917/56649ee75503460f94bf80f8/html5/thumbnails/4.jpg)
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
+
+
![Page 5: Jarred Alexander Young October 22, 2012. All components biased relative to ground May prevent beam generation Beam Diagnostics thrown off by Decel.](https://reader035.fdocuments.net/reader035/viewer/2022080917/56649ee75503460f94bf80f8/html5/thumbnails/5.jpg)
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)▪ 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
![Page 6: Jarred Alexander Young October 22, 2012. All components biased relative to ground May prevent beam generation Beam Diagnostics thrown off by Decel.](https://reader035.fdocuments.net/reader035/viewer/2022080917/56649ee75503460f94bf80f8/html5/thumbnails/6.jpg)
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