Cathode Coupling in Hall Thrusters
Cathode Coupling in Hall Thrusters
复制标题
霍尔推进器中的阴极耦合
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
R. Watkins
中科院分区：
文献类型：
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作者：
K. Jameson;D. Goebel;R. Hofer;R. Watkins
针对一台6 kW霍尔推力器，研究了阴极流量和阴极耦合对推力器总效率的影响。的推力器与传统安装的外部阴极和其性能和效率进行了比较，其操作与内部安装，轴上阴极。为了分析不同操作条件下的效率，采用了几种外部诊断。诊断包括推力台、远场探头（发射型、法拉第型、ExB型和RPA型）、近场探头（朗缪尔型和发射型）、校准质量流量计以及校准电压和电流测量。对于给定的功率水平，与外部安装的阴极相比，使用内部安装的阴极时，阴极对地耦合电压显著降低（约6-10 V）。此外，阴极到地的耦合电压被观察到的幅度增加，在一个恒定的功率水平，但总的推力器的效率不受影响的阴极流率降低。最后，总的推力器效率提高了2-3%时，利用内部阴极与外部阴极。
The effects of cathode flow rate and cathode coupling on total thruster efficiency are examined for a 6 kW Hall thruster. The thruster was operated with a traditionally mounted external cathode and its performance and efficiency are compared to its operation with an internally-mounted, on-axis cathode. To analyze the efficiency at different operating conditions, several external diagnostics were employed. The diagnostics include a thrust stand, far-field probes (emissive, Faraday, ExB, and RPA), near-field probes (Langmuir and emissive), calibrated mass flow rate meters, and calibrated voltage and current measurements. The cathode to ground coupling voltage decreased significantly (approximately 6-10 V) when using the internally mounted cathode compared to the externally mounted cathode for a given power level. In addition, the cathode to ground coupling voltage was observed to increase in magnitude with decreasing cathode flow rate at a constant power level but the total thruster efficiency was not affected. Lastly, the total thruster efficiency was improved by 2-3% when utilizing the internal cathode versus the external cathode.