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束流分布是表征离子推力器性能的关键技术指标,直接影响到离子推力器的工作稳定性和可靠性。针对引出束流分布不均匀导致30 cm氙离子推力器离子光学系统打火保护的问题,开展了阴极挡板性能试验,研究分析了阴极挡板对离子光学系统引出束流的影响作用关系,以及设置阴极挡板前后和设置不同规格阴极挡板时推力器放电室性能变化规律。试验表明:设置阴极挡板可有效提高离子光学系统引出束流分布的均匀性,进而改善推力器的连续工作稳定性;同时,设置阴极挡板后,推力器在高功率工作模式下的放电室阳极电压、放电损耗与未设置阴极挡板相比有明显增大,且放电室阳极电压、放电损耗随阴极挡板直径的增大而增大。研究为提高30 cm氙离子推力器工作稳定性提供技术指导。
The beam distribution is a key technical indicator to characterize the performance of the ion thruster, which directly affects the stability and reliability of the ion thruster. Aiming at the problem of ignition protection of ion optical system of 30 cm xenon ion thruster due to uneven distribution of outgoing beam, the cathode baffle performance test was carried out. The influence of the cathode baffle on the ion beam outgoing from the ion optical system was studied. Set the cathode baffle before and after setting different specifications of the cathode baffle thruster discharge chamber performance changes. The experiment shows that the cathode baffle can effectively improve the uniformity of the ion beam distribution and improve the continuous working stability of the thruster. At the same time, after the cathode baffle is installed, the thruster can be operated in high power mode The anode voltage and discharge loss obviously increase compared with those without cathode baffle, and the anode voltage and discharge loss of the discharge chamber increase with the increase of cathode baffle diameter. The study provides technical guidance for improving the working stability of a 30 cm Xenon thruster.