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Effects of Background Pressure on SPT-140 Hall Thruster Performance
Journal of Propulsion and Power ( IF 1.9 ) Pub Date : 2020-05-11 , DOI: 10.2514/1.b37702
John Steven Snyder 1 , Giovanni Lenguito 2 , Jason D. Frieman 3 , Thomas W. Haag 3 , Jonathan A. Mackey 3
Affiliation  

The performance of many Hall thrusters has been shown to exhibit sensitivity to background pressure in ground-based test facilities, and this property can have an impact on the prediction of in-space performance. The SPT-140 Hall thruster, similar in design to the SPT-100 thruster, which shows such sensitivity, was subjected to a series of tests to characterize the effects of background pressure on thruster performance over a discharge power range of 0.9–4.5 kW. Thrust sensitivity to pressure, in an absolute sense, was largest at 4.5 kW and decreased with power until there was little-to-no measurable effect at 0.9 kW. In a relative sense, thrust sensitivity was similar at all powers above 0.9 kW with about 2–4% higher thrust measured at 10 μTorr than at the lowest operating pressure. Thruster magnetic field sensitivity, examined as a function of magnet current, did not have a strong dependence on facility pressure.



中文翻译:

背景压力对SPT-140霍尔推力器性能的影响

在地面测试设备中,许多霍尔推力器的性能已显示出对背景压力的敏感性,并且此属性可能会对太空性能的预测产生影响。SPT-140霍尔推进器在设计上与SPT-100推进器类似,显示了这种灵敏度,因此经过了一系列测试,以表征背景压力对0.9-4.5 kW放电功率范围内推进器性能的影响。从绝对意义上说,推力对压力的敏感度在4.5 kW时最大,并随功率的降低而降低,直到在0.9 kW几乎没有可测量的效果为止。从相对的角度来看,在高于0.9 kW的所有功率下,推力灵敏度都相似,而在110 kW时测得的推力则高出约2-4%。10 μr而不是最低的工作压力。推力磁场灵敏度(作为磁流的函数进行检查)与设备压力没有很大关系。

更新日期:2020-05-11
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