Ion Acceleration Modes in a Miniature Helicon Thruster
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1 Ion Acceleration Modes in a Miniature Helicon Thruster Timothy A. Collard, Frans H. Ebersohn, J. P. Sheehan, and Alec D. Gallimore Friday, October 16, 2015 Honolulu, HI
2 CubeSat Affordable Platform, Limited Capabilities Modularized, based on 10 cm cubes Limited available propulsion options High performance propulsion is mission enabling 68 th Annual GEC/9 th International Conference on Reactive Plasma/33 rd Symposium on Plasma Processing 2
3 CubeSat Ambipolar Thruster (CAT) Electrodeless, permanent magnet, helicon Volume without propellant tank < 1U ΔV > 1000 m/s 68 th Annual GEC/9 th International Conference on Reactive Plasma/33 rd Symposium on Plasma Processing 3
4 Experimental Setup 1200 L/s pumping speed on argon 68 th Annual GEC/9 th International Conference on Reactive Plasma/33 rd Symposium on Plasma Processing 4
5 Diagnostics RPA measured ion energy distribution Emissive probe measured plasma potential 68 th Annual GEC/9 th International Conference on Reactive Plasma/33 rd Symposium on Plasma Processing 5
6 Three Operational Modes Two with Energetic Ions > 10 sccm, > 20 W 3-15 sccm, < 15 W < 0.3 sccm, > 50 W 68 th Annual GEC/9 th International Conference on Reactive Plasma/33 rd Symposium on Plasma Processing 6
7 Operational Mode High Flow Rate, Low Power Mode > 10 sccm, > 20 W 3-15 sccm, < 15 W < 0.3 sccm, > 50 W 68 th Annual GEC/9 th International Conference on Reactive Plasma/33 rd Symposium on Plasma Processing 7
8 High Flow Rate, Low Power Mode Vary Input Power, P 1x10 4 Torr, Ar 68 th Annual GEC/9 th International Conference on Reactive Plasma/33 rd Symposium on Plasma Processing 8
9 High Flow Rate, Low Power Mode Vary RPA Position, P 1x10 4 Torr, Ar 68 th Annual GEC/9 th International Conference on Reactive Plasma/33 rd Symposium on Plasma Processing 9
10 Operational Mode Low Flow Rate, High Power Mode > 10 sccm, > 20 W 3-15 sccm, < 15 W < 0.3 sccm, > 50 W 68 th Annual GEC/9 th International Conference on Reactive Plasma/33 rd Symposium on Plasma Processing 10
11 Low Flow Rate, High Power Mode Vary Input Power, P 1x10 6 Torr, Xe 68 th Annual GEC/9 th International Conference on Reactive Plasma/33 rd Symposium on Plasma Processing 11
12 Low Flow Rate, High Power Mode Vary RPA Position, P 1x10 6 Torr, Xe 68 th Annual GEC/9 th International Conference on Reactive Plasma/33 rd Symposium on Plasma Processing 12
13 Conclusions Multiple significantly different modes observed Different operational parameters Different plume structures Different ion energies Two of three modes show promising characteristics Possible high specific impulse modes 68 th Annual GEC/9 th International Conference on Reactive Plasma/33 rd Symposium on Plasma Processing 13
14 Future Work 2D plume mapping Plasma potential Density Electron temperature Determination of plume composition Direct thrust and specific impulse measurement Measurement of efficiency 68 th Annual GEC/9 th International Conference on Reactive Plasma/33 rd Symposium on Plasma Processing 14
15 Acknowledgements Thank you for your time! Questions? This material is based upon work supported by the National Science Foundation Graduate Research Fellowship Program under Grant No. DGE and NASA under Grant No. NNX14AD71G. Thank you to the members of PEPL for their insightful discussion concerning this research. 68 th Annual GEC/9 th International Conference on Reactive Plasma/33 rd Symposium on Plasma Processing 15
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