Performance experiments of the dual-stage 4-grid ion thruster were conducted. Experimental results showed that the specific impulse reached 7100 s and the beam divergence angle reached 6.3° when the screen and extraction potentials were 4.5 and 2.5 kV, respectively. The test results of beam extraction characteristics showed that the extraction capacity of ions was determined by extraction potential and was independent of screen grid and acceleration stage potentials. The extraction capacity of ions was analyzed with plasma sheath theory, and conclusions were in accordance with the experimental results. This study presents the decoupling mechanism of ion extraction and acceleration processes of the dual-stage ion 4-grid optical system by experiment and simulation.

中文翻译：

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双级四栅离子推进器的实验研究

进行了两级四栅离子推进器的性能实验。实验结果表明，当屏蔽电位和提取电位分别为4.5和2.5 kV时，比脉冲达到7100 s，束发散角达到6.3°。束提取特性的测试结果表明，离子的提取能力取决于提取电位，并且与屏蔽栅和加速级电位无关。用等离子鞘层理论分析了离子的提取能力，得出的结论与实验结果吻合。通过实验和仿真，提出了双级离子四栅光学系统离子提取与加速过程的解耦机理。