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首页> 外文会议>IEEE International Conference on Plasma Science;International Conference on High-Power Particle Beams >Atomic boron speed distribution measurements in the plume of a hall thruster using laser-induced fluorescence
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Atomic boron speed distribution measurements in the plume of a hall thruster using laser-induced fluorescence

机译：利用激光诱导的荧光测量霍尔推进器羽流中的硼原子速度分布

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Summary form only given. Hall thrusters are a type of electric propulsion device which are increasingly used for satellite station keeping and deep-space propulsion applications. Despite the widespread use and maturity of Hall thruster technology, much of the plasma physics which governs their operation remains unknown. Of particular interest is the sputter erosion process which slowly erodes the insulating channel walls. A cavity ring-down spectroscopy (CRDS) sensor has been developed for real-time in-situ measurements of the eroded atomic boron density, which, when coupled with the boron speed distribution, yields an absolute channel erosion rate. While the speed distributions of sputtered boron are fairly well known from a simple planar geometry and with controlled plasma conditions, a Hall thruster is more complicated.We present measurement of sputtered atomic boron speed distributions within the plume of an operating SPT-70 Hall thruster. To the best of our knowledge, these measurements are the first LIF measurements of sputtered products within the plume of a Hall thruster. When high-energy xenon atoms impact the thruster wall, boron atoms are ejected into the thruster plume. Laser-induced fluorescence near 250 nm was used to measure the Doppler shift of the boron atoms and therefore the speed of these atoms along the thruster axis. A hollow-cathode lamp provided an unshifted-frequency reference (i.e. a zero-speed reference point). The measured boron velocity distributions closely follow a Sigmund-Thompson distribution. The first moment of the velocity distribution was found to be 3836 ± 183 m/s, and did not change significantly at two channel locations. Such distributions will allow absolute channel erosion measurements using the aforementioned CRDS sensor, as well as help validate high-fidelity thruster erosion models.
机译：仅提供摘要表格。霍尔推力器是一种电动推进装置，越来越多地用于卫星站保持和深空推进应用。尽管霍尔推力器技术得到了广泛的应用和成熟，但控制其运行的许多等离子体物理学仍然未知。特别令人关注的是溅射腐蚀过程，该过程会慢慢腐蚀绝缘通道壁。已经开发了腔衰荡光谱仪（CRDS）传感器，用于被腐蚀的原子硼密度的实时原位测量，当与硼速度分布结合时，可产生绝对的通道腐蚀速率。虽然从简单的平面几何形状和受控的等离子条件下众所周知，溅射硼的速度分布是众所周知的，但霍尔推力器却更为复杂。我们提出了在运行中的SPT-70霍尔推力器羽流内测量溅射原子硼速度分布的方法。据我们所知，这些测量是霍尔推力器羽流内溅射产品的首次LIF测量。当高能氙原子撞击推进器壁时，硼原子被喷射到推进器羽流中。激光诱导的250 nm附近的荧光用于测量硼原子的多普勒频移，从而测量这些原子沿推进器轴的速度。空心阴极灯提供了无频移的参考点（即零速参考点）。测得的硼速度分布紧密遵循西格蒙德-汤普森分布。速度分布的第一力矩为3836±183 m / s，在两个通道位置没有明显变化。这样的分布将允许使用上述CRDS传感器进行绝对通道腐蚀测量，并有助于验证高保真推进器腐蚀模型。

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