Facing the challenges of in-situ utilization of lunar regolith resources, applying an external electric field to manipulate lunar particles has become a promising method for space particle control, which mainly depends on the particle charging properties in the applied electric field. Using the surficial lunar regolith samples brought back from the Moon by the Chang’e-5 mission (CE5 LS), this work successively studied their charging properties, particle dynamics, and their collision damages to aerospace materials under the action of an external electric field in high-vacuum conditions. The results indicated that the charging process and electrostatic projection of lunar regolith particles under high-vacuum conditions were different from those under atmosphere conditions. The particle diameter range of CE5 LS used in the experiment is 27.7–139.0 μm. For electric field strength of 3–12 kV·cm−1, the charge obtained by CE5 LS is 4.8 × 10−15–4.7 × 10−13 C and the charge-to-mass ratio is 1.2 × 10−5–6.8 × 10−4 C·kg−1. The CE5 LS is easier to be negatively charged in an external electric field. Furthermore, significant damages were observed on the target impact surfaces, indicating severe influences of lunar regolith particles on aerospace materials. Our work contributes to a more comprehensive understanding of physical mechanisms controlling the lunar regolith shielding and utilization, and will inspire broad efforts to develop the lunar in-situ engineering solutions.

中文翻译：

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嫦娥五号月球样品在外电场下的电荷特性与粒子动力学


面对月球风化层资源原位利用的挑战，利用外部电场操纵月球粒子已成为一种很有前途的空间粒子控制方法，其主要依赖于外加电场中的粒子电荷特性。利用嫦娥五号任务 （CE5 LS） 从月球带回的月球表面风化层样品，本工作先后研究了它们在高真空条件下外电场作用下的电荷特性、粒子动力学及其对航空航天材料的碰撞损伤。结果表明，高真空条件下月球风化层粒子的充电过程和静电投射与大气条件下不同。实验中使用的 CE5 LS 的粒径范围为 27.7–139.0 μm。对于 3–12 kV·cm−1 的电场强度，CE5 LS 获得的电荷为 4.8 × 10−15–4.7 × 10−13 C，电荷质量比为 1.2 × 10−5–6.8 × 10−4 C·kg−1。CE5 LS 在外部电场中更容易带负电。此外，在目标撞击面上观察到重大损坏，表明月球风化层颗粒对航空航天材料有严重影响。我们的工作有助于更全面地了解控制月球风化层屏蔽和利用的物理机制，并将激发开发月球原位工程解决方案的广泛努力。