Spatially- and vector-resolved momentum flux lost to a wall in a magnetic nozzle rf plasma thruster
Spatially- and vector-resolved momentum flux lost to a wall in a magnetic nozzle rf plasma thruster
复制标题
磁喷嘴射频等离子体推进器中壁损失的空间和矢量解析动量通量
DOI：
10.1038/s41598-020-58022-6
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发表时间：
2020
影响因子：
4.6
通讯作者：
and Akira Ando
中科院分区：
文献类型：
--
作者：
Kazunori Takahashi;Takeharu Sugawara;and Akira Ando
在实验室中，大多数人工低压等离子体与物理壁接触;壁处的等离子体损失显著影响等离子体装置的性能，例如，电力推进装置在壁的表面附近，离子被鞘层自发地加速，并将它们的动量和能量传递到壁，而大多数电子在那里被反射。离子的动量通量是矢量场，即，具有径向和轴向分量，即使在圆柱形系统中忽略方位角分量。在这里，空间和矢量分辨的测量磁喷嘴射频（rf）等离子体推力器配置的圆柱形源壁附近的动量通量成功地证明了通过使用动量矢量测量仪器。实验结果确定了一个不可忽略的轴向动量通量的空间分布的壁，而径向加速的离子似乎是负责的能量损失的墙壁。径向和轴向动量通量的空间分布以及损失到壁面的能量受磁场强度的显著影响。结果有助于了解如何以及在人工等离子体装置的动量和能量的损失，除了目前测试的推进器。
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.