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Flight Ion and Hall Thrusters 441 Table 9-8. STP Hall thruster performance. Parameter Slot diameter (cm) Thruster input power (W) Average Isp (s) Thrust (mN) Total efficiency (%) Status SPT-50 SPT-70 SPT-100 SPT-140 5 7 10 14 350 700 1350 5000 1100 1500 1600 1750 20 40 80 300 35 45 50 >55 Flight Flight Flight Qualified Fig. 9-9. Photograph of an SPT-100 Hall thruster (from [33]). PPS-1350-G Hall thruster [37,38] manufactured by SNECMA Moteurs in France [39] was launched on SMART-1 in 2003 and provided primary propulsion for this mission. This thruster is based on the SPT-100 and is similar in size and power level. The thruster was operated over a throttleable power range of 462 to 1190 W for this lunar mission, producing a maximum thrust of 70 mN at an Isp of 1600 s. The finite efficiency of the power processing system required that the spacecraft supply 650 to 1420 W to the electric propulsion system. The PPS-1350 Hall thruster accumulated about 5000 hours of operation in space, and processed 82 kg of xenon in a very successful mission that featured several extensions of the mission life due to the thruster capabilities. The nominal performance of this thruster at 1.35 kW is shown in Table 9-9. The thruster schematic was shown in Chapter 7, and a photograph of the PPS- 1350 Hall thruster is shown in Fig. 9-10.PDF Image | Fundamentals of Electric Propulsion: Ion and Hall Thrusters
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