空间和矢量分辨的动量通量损失到电磁喷嘴射频等离子体推进器的壁上。,Scientific Reports

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空间和矢量分辨的动量通量损失到电磁喷嘴射频等离子体推进器的壁上。
Scientific Reports ( IF 3.8 ) Pub Date : 2020-01-23 , DOI: 10.1038/s41598-020-58022-6
Kazunori Takahashi ₁ , Takeharu Sugawara ₁ , Akira Ando ₁

Affiliation

大多数人造低压等离子体与实验室中的物理壁接触；因此，在实验室中，这些低压等离子体会与物理壁接触。壁上的等离子体损失会严重影响等离子体装置的性能，例如电推进装置。在壁的表面附近，离子被鞘层自发加速，并将其动量和能量传递到壁上，而大多数电子在那里被反射。离子的动量通量是矢量场，即，即使在圆柱系统中忽略了方位分量，也具有径向分量和轴向分量。在这里，通过使用动量矢量测量仪成功地展示了在电磁喷嘴射频（rf）等离子推进器配置的圆柱源壁附近的动量通量的空间分辨和矢量分辨测量。结果通过实验确定了到壁的不可忽略的轴向动量通量的空间分布，而径向加速的离子似乎是造成壁能量损失的原因。径向和轴向动量通量的空间分布以及损失到壁上的能量受磁场强度的影响很大。除目前测试的推进器外，结果有助于了解如何以及在哪里失去人造等离子体设备中的动量和能量。

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Spatially- and vector-resolved momentum flux lost to a wall in a magnetic nozzle rf plasma thruster.

Most of the artificial low-pressure plasmas contact with physical walls in laboratories; the plasma loss at the wall significantly affects the plasma device performance, e.g., an electric propulsion device. Near the surface of the wall, ions are spontaneously accelerated by a sheath and deliver their momentum and energy to the wall, while most of the electrons are reflected there. The momentum flux of the ions is a vector field, i.e., having both the radial and axial components even if the azimuthal components are neglected in a cylindrical system. Here the spatially- and vector-resolved measurement of the momentum flux near the cylindrical source wall of a magnetic nozzle radiofrequency (rf) plasma thruster configuration is successfully demonstrated by using a momentum vector measurement instrument. The results experimentally identify the spatial profile of a non-negligible axial momentum flux to the wall, while the radially accelerated ions seem to be responsible for the energy loss to the wall. The spatial profiles of the radial and axial momentum fluxes and the energy lost to the wall are significantly affected by the magnetic field strength. The results contribute to understand how and where the momentum and energy in the artificial plasma devices are lost, in addition to the presently tested thruster.

更新日期：2020-01-23

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