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霍尔推力器(HET)是一种先进的电推进装置,在航天领域有着广泛应用。为了衡量亚稳态原子对于推力器电离过程的影响,提高相应电离计算模拟模型的准确性,应用发射光谱线强度比计算方法来确定HET通道中包含亚稳态原子贡献的氪原子有效电离速率。实验发现,考虑亚稳态院子的贡献后,氪原子有效电离速率相对于未考虑亚稳态贡献的基态原子电离速率高,在15～20eV的电子温度范围内增加最多,大约11%。计算结果说明亚稳态原子的存在使得HET通道内氪原子具有较高的有效电离速率,所以在HET电离模型中必须引入亚稳态的贡献项。
Hall Thruster (HET) is an advanced electric propulsion device that has a wide range of applications in aerospace. In order to measure the influence of metastable atoms on the ionization process of thrusters and improve the accuracy of the corresponding ionization simulation model, the effective ionization rate of krypton atom in HET channels containing metastable atoms is determined by the method of calculating the emission line intensity ratio. The experimental results show that the effective ionization rate of krypton atoms is higher than that of the ground state atomic ion without contribution of metastable states, accounting for 11% of the total electron temperature range from 15 to 20eV. The results show that the presence of metastable atoms makes the krypton atom in the HET channel have a high effective ionization rate, so a metastable contribution term must be introduced into the HET ionization model.