FC01
Faraday plume diagnostics
The Faraday model calculates beam current, divergence angle, and peak current density from an angular plume distribution.
- Beam current
- 3.38A
- Divergence angle
- 19.2deg
- Peak current density
- 2.82mA/cm2
Hall thruster diagnostic application
Full SPT-100 Hall Thruster Diagnostic System
Combine four diagnostic modules with an automatic operating-condition scan for an SPT-100 Hall thruster.
This page uses reference data and engineering calculations. It does not show measured test data.
- Design point
- 300 V / 4.5 A / 1.35 kW
- Default model baseline
- 300 V / 5.0 mg/s
- Diagnostic modules
- Faraday · RPA · ExB · Thrust stand
Four diagnostic modules use one operating point
The model calculates the same result set for the four modules. Use the results to calculate system limits. Use the results to compare operating points.
RPA02
RPA ion-energy diagnostics
The RPA model calculates the most probable ion energy and the ion-energy spread at each operating point.
- Most probable ion energy
- 258.0eV
- Ion-energy spread
- 25.5eV
ExB03
ExB charge-state diagnostics
The ExB model calculates the relative Xe+, Xe2+, and Xe3+ fractions for the selected operating point.
- Xe+ fraction
- 89.5%
- Xe2+ fraction
- 9.5%
- Xe3+ fraction
- 1.0%
T04
Thrust-stand diagnostics
The thrust-stand model calculates thrust and an engineering estimate of measurement uncertainty.
- Thrust
- 82.7mN
- Thrust uncertainty
- 0.40mN
Select two parameters for the three-dimensional distribution
Select two parameters as scan axes. Set the other parameters as fixed values.
Current model point
Estimated SPT-100 performance
The cards use the midpoint of each scan axis and the fixed values.
- Anode efficiency
- 42.7%
- Thrust
- 63.7mN
- Specific impulse
- 1,445s
- Discharge current
- 3.77A
Calculated surface
Three-dimensional operating-condition distribution
Move the view-angle control to change the perspective. Move the pointer across the surface to read local values.
Anode voltage275 V
Anode xenon flow4.00 mg/s
Anode efficiency42.7 %
30.2 %50.0 %
Use the results as engineering estimates
SPT-100 design point
The SPT-100 design point is 300 V and 4.5 A. The discharge power is approximately 1.35 kW.
Default baseline
The default 300 V and 5.0 mg/s values come from the SPT-100 reference table on this site.
Diagnostic estimates
Cathode, RPA, ExB, and thrust-stand results are engineering estimates. They are not measured data.
Applicable scope
Use the results to calculate system limits. Use the results to compare operating points. Do a controlled vacuum test with calibrated hardware. Make sure that the specified limits are correct.