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SHU Mintao, WANG Guodong, XU Zhuangzhuang, YAO Jikai, QIAN Du. Simulation Study on Discharge Characteristics of Radio Frequency Ion Thruster with Iodine Working Medium[J]. CHINESE JOURNAL OF VACUUM SCIENCE AND TECHNOLOGY, 2024, 44(2): 125-131. DOI: 10.13922/j.cnki.cjvst.202307002
Citation: SHU Mintao, WANG Guodong, XU Zhuangzhuang, YAO Jikai, QIAN Du. Simulation Study on Discharge Characteristics of Radio Frequency Ion Thruster with Iodine Working Medium[J]. CHINESE JOURNAL OF VACUUM SCIENCE AND TECHNOLOGY, 2024, 44(2): 125-131. DOI: 10.13922/j.cnki.cjvst.202307002

Simulation Study on Discharge Characteristics of Radio Frequency Ion Thruster with Iodine Working Medium

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  • Received Date: July 03, 2023
  • Available Online: January 28, 2024
  • Iodine, as a potential working medium in space thrusters, has attracted much attention in recent years. Unlike xenon, the discharge products of iodine working medium are more complex, containing small amounts of I, I2+, I2+ and I3+. Although the content of polyvalent ions is small, it has a great influence on the working performance of thrusters. In this paper, a two-dimensional axisymmetric model is established based on plasma discharge, studying the effects of mass flow rate, RF power and background pressure on two main ionization products, I+ and I2+. When the mass flow rate ranges from 20 to 70 mL/min, I+ slightly decreases and I2+ slightly increases with the increase of mass flow rate. When the RF power ranges from 100 to 650 W, I+ increases rapidly with the increase of RF power, and I2+ decreases slightly. When the background pressure ranges from 0.001 to 0.1 Torr, I+ initially increases rapidly with the increase of background pressure and it begins to decrease at around p0= 0.015 Torr. I2+ has maintained a slow increase. Ignoring the influence of ionization loss, conducting a full factor design of experiment (DOE) of the three influencing factors. When the mass flow rate is 60 mL/min, the RF power is 150 W, and the background pressure is 0.015 Torr, obtaining the optimal product I2+:I+=0.204094, which is consistent with the simulation result I2+:I+=0.205069, and the error is 0.48%.

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