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High Energy Plume Impingement on Spacecraft Systems
AFOSR Telecon
Jarred Alexander YoungFebruary 12, 2013
Current Events
Beam Testing LabView programs successfully upgraded Results acquired from differing anode
voltages▪ Shows energy changes across different voltages
Technical Difficulties Filament supply broke down again; two weeks
for shipping and repair Electron conduction problem▪ Recently repaired
New Beam Data
Performed analysis across two settings to see if peak of distribution could be moved Third setting from previous
data (12/20/2012)
Looked at moving filter effects on picoammeter data
Results gathered at similar beam currents
Quantity
Setting 1
Setting 2
Setting 3
Anode Voltage 179 V 190 V 218 V
Discharge
Voltage115 V 126 V 154 V
Accel Grid
Voltage-182 V -182 V -182 V
*Voltages relative to ground
0 50 100 150 200 250 300 3500.00E+00
2.00E+00
4.00E+00
6.00E+00
8.00E+00
1.00E+01
1.20E+01
Ion Energy vs. Collector Voltage ComparisonTest 6 vs. 8
Anode Voltage: 179 VAnode Voltage: 190 V
Collector Voltage (V)
Ion
En
erg
y (
A/V
)
0 50 100 150 200 250 300 3500.00E+00
2.00E+00
4.00E+00
6.00E+00
8.00E+00
1.00E+01
1.20E+01
Ion Energy vs. Collector Voltage ComparisonTest 6 vs. 8
Collector Voltage (V)
Ion
En
erg
y (
A/V
)
0 50 100 150 200 250 300 350
-2.00E-14
-1.50E-14
-1.00E-14
-5.00E-15
0.00E+00
5.00E-15
1.00E-14
1.50E-14
Ion Energy vs. Collector Voltage ComparisonTest 6 vs. 8 vs. 11 (from 12-20-2012) (Different Anode Current from 6 and 8)
Anode Voltage: 179 VAnode Voltage: 190 VAnode Voltage: 218 V
Collector Voltage (V)
Ion E
nerg
y (
A/V
)
0 50 100 150 200 250 300 350
-2.00E-14
-1.50E-14
-1.00E-14
-5.00E-15
0.00E+00
5.00E-15
1.00E-14
1.50E-14
Ion Energy vs. Collector Voltage ComparisonTest 6 vs. 8 vs. 11 (from 12-20-2012) (Different Anode Current from 6 and 8)
Collector Voltage (V)
Ion E
nerg
y (
A/V
)
Beam Data Summary
Data shows that the energy peak is moving as expected As anode voltage increases, peak moves towards the
right of the voltage spectrum
Estimated energy level range: ~100-300 eV
Test #Anode
Current (mA)
Discharge
Current (mA)
Filament Current
(A)
Accel Grid
Current (mA)
Energy Peak (eV)
6 1.68 79.7 4.314 -1.53 175.75
8 1.69 72.5 4.371 -1.62 184.84
11 (from12/2
0).41 14.22 4.051 -.24 236.36 (?)
Coupon Mounting
Designed to mount on the front of the RPA
Allows for: Testing of 3 x 7 mm
material samples▪ Includes silicon
coupons from ISU Monitoring of
energy level during beam exposure
Mount points
Upcoming Tasks
Finish beam energy testing and compile matrix of energy levels
Begin coupon testing at different beam energy levels
