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Rapid evaluation of ion thruster lifetime using optical emission spectroscopy

机译:使用光发射光谱法快速评估离子推进器寿命

摘要

A major life-limiting phenomenon of electric thrusters is the sputter erosion of discharge chamber components. Thrusters for space propulsion are required to operate for extended periods of time, usually in excess of 10,000 hr. Lengthy and very costly life-tests in high-vacuum facilities have been required in the past to determine the erosion rates of thruster components. Alternative methods for determining erosion rates which can be performed in relatively short periods of time at considerably lower costs are studied. An attempt to relate optical emission intensity from an ion bombarded surface (screen grid) to the sputtering rate of that surface is made. The model used a kinetic steady-state (KSS) approach, balancing the rates of population and depopulation of ten low-lying excited states of the sputtered molybdenum atom (MoI) with those of the ground state to relate the spectral intensities of the various transitions of the MoI to the population densities. Once this is accomplished, the population density can be related to the sputtering rate of the target. Radiative and collisional modes of excitation and decay are considered. Since actual data has not been published for MoI excitation rate and decay constants, semiempirical equations are used. The calculated sputtering rate and intensity is compared to the measured intensity and sputtering rates of the 8 and 30 cm ion thrusters.
机译:电动推进器的主要寿命限制现象是放电室组件的溅射腐蚀。太空推进器需要长时间运转,通常超过10,000小时。过去,为了确定推进器部件的腐蚀速率,需要在高真空设施中进行冗长且非常昂贵的寿命测试。研究了确定腐蚀速率的替代方法,该方法可以在相对较短的时间内以较低的成本进行。试图将来自离子轰击表面(筛栅)的光发射强度与该表面的溅射速率相关联。该模型使用动力学稳态(KSS)方法,平衡了溅射的钼原子(MoI)的十个低位激发态与基态的种群增长和人口减少的速率,从而关联了各种跃迁的光谱强度教育部对人口密度的影响。一旦完成,人口密度可以与靶材的溅射速率相关。考虑了激发和衰减的辐射和碰撞模式。由于尚未发布有关MoI激发速率和衰减常数的实际数据,因此使用了半经验方程。将计算出的溅射速率和强度与8和30 cm离子推进器的测量强度和溅射速率进行比较。

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