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Operation of a High-Power Nested Hall Thruster with Reduced Cathode Flow Fraction
Journal of Propulsion and Power ( IF 1.9 ) Pub Date : 2020-07-13 , DOI: 10.2514/1.b37929
Scott J. Hall 1 , Benjamin A. Jorns 1 , Alec D. Gallimore 1 , Dan M. Goebel 2
Affiliation  

A high-power nested Hall thruster was operated with cathode flow fractions from 7 to 3% of the total anode flow rate in a two-channel operating configuration at 27 kW total discharge power. The thruster was operated with a state-of-the-art high-current cathode featuring novel external propellant injectors. In stand-alone testing, the cathode has been shown to operate stably up to 300 A with a total flow rate of 36 sccm of xenon. The experiment reported here demonstrated the extensibility of these low flow rates to operation when integrated into the thruster. The impact of the lower-than-nominal flow rates was evaluated using direct thrust measurements, plasma diagnostics, and high-speed current measurement. These results were used to calculate the cathode coupling voltage, most probable beam ion voltage, anode efficiency, total efficiency, and the discharge current oscillation magnitude. It was found that the thruster could be operated with little identifiable change in behavior or performance with a cathode fraction as small as 4%. When the cathode flow fraction was reduced beyond that, the thruster exhibited reduced performance. Implications of these results for future high-power operation of Hall thrusters are discussed.



中文翻译:

降低阴极流率的大功率嵌套式霍尔推力器的运行

高功率嵌套式霍尔推力器在总排放功率为27 kW的两通道运行配置中,阴极流量分数为总阳极流量的7%至3%。推进器采用了具有新型外部推进剂喷射器的最新式大电流阴极。在独立测试中,已证明阴极可在高达300 A的电流下稳定运行,氙的总流量为36 sccm。此处报道的实验证明了集成到推进器中后,这些低流量流量的可扩展性。使用直接推力测量,等离子体诊断和高速电流测量来评估低于标称流速的影响。这些结果用于计算阴极耦合电压,最可能的束离子电压,阳极效率,总效率,和放电电流振荡幅度。已经发现,推进器可以在行为或性能上几乎没有可识别的变化地操作,而阴极分数低至4%。当阴极流量分数降低到该水平以下时,推进器表现出降低的性能。讨论了这些结果对霍尔推力器未来大功率运行的影响。

更新日期:2020-08-20
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