火箭推进

目前针对空心阴极的大批次组件级性能测试多采用金属阳极结构,与空心阴极实际工作时采用正离子束流作为阳极的情况存在差异。为验证分别以金属电极和正离子束流作为阳极时空心阴极放电特性的差别,设计对比试验,分别对两种情况下的空心阴极的放电特性、振荡特性以及频率特性进行了分析。试验结果及FFT分析表明采用正离子束作为阳极时,阴极在2～12 MHz之间将会出现多个相关的频率分量; 采用金属阳极时,空心阴极放电稳定性与供气流量密切相关; 当供气流量大于羽状模式转换阈值时,FFT分析未发现相关频谱分量,当供气流量小于转换阈值时,放电电压将在17 MHz处出现振荡分量,增大供气流量可有效的消除该分量。研究结果为空心阴极的筛选试验改进提供了理论依据。

At present,the large-batch module-level performance test for hollow cathodes mostly adopts metal anode structure,which is different from the situation that the hollow cathode uses positive ion beam as the anode in actual work.In order to verify the difference in the discharge characteristics of the hollow cathode when the metal electrode and the positive ion beam are used as the anode,a comparative experiment was designed,and the discharge characteristics,oscillation characteristics and frequency characteristics of the hollow cathode were analyzed in two cases.The test results and FFT analysis show that when the positive ion beam was used as the anode,the cathode will have multiple relevant frequency components between 2 MHz and 12 MHz; when the metal anode was used,the discharge stability of the hollow cathode is closely related to the gas flow.When the air flow is greater than the plume mode switching threshold,FFT analysis does not find the relevant spectral components.When the air supply flow is less than the switching threshold,the discharge voltage will have an oscillating component at 17 MHz.Increasing the air supply flow can effectively eliminate this component.The research results provide a theoretical basis for the improvement of the hollow cathode screening test.

引言
1 试验装置及产品
2 试验及结果分析
3 结论

图1 真空试验系统装置图<br/>Fig.1 Schematic diagram of the hollow cathode test facility

图1 真空试验系统装置图
Fig.1 Schematic diagram of the hollow cathode test facility

图2 放电参数与供气流量之间的关系(金属阳极)<br/>Fig.2 Relationship between discharge parameters and gas flow(metal anode)

图2 放电参数与供气流量之间的关系(金属阳极)
Fig.2 Relationship between discharge parameters and gas flow(metal anode)

图3 不同供气流量下放电电压的FFT分析结果(金属阳极)<br/>Fig.3 FFT analysis results of discharge voltage under different gas supply flow(metal anode)

图3 不同供气流量下放电电压的FFT分析结果(金属阳极)
Fig.3 FFT analysis results of discharge voltage under different gas supply flow(metal anode)

图4 放电参数与供气流量之间的关系(虚拟阳极)<br/>Fig.4 Relationship between discharge parameters and gas flow(virtual anode)

图4 放电参数与供气流量之间的关系(虚拟阳极)
Fig.4 Relationship between discharge parameters and gas flow(virtual anode)

图5 不同供气流量下放电电压的FFT结果(虚拟阳极)<br/>Fig.5 FFT analysis results of discharge voltage under different gas supply flow(virtual anode)

图5 不同供气流量下放电电压的FFT结果(虚拟阳极)
Fig.5 FFT analysis results of discharge voltage under different gas supply flow(virtual anode)

图6 额定点下金属、虚拟阳极放电电流特性对比<br/>Fig.6 Comparison of metal anode and virtual anode

图6 额定点下金属、虚拟阳极放电电流特性对比
Fig.6 Comparison of metal anode and virtual anode

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备注

引言

1 试验装置及产品

2 试验及结果分析

3 结论

期刊信息