Effect of radial plasma transport at the magnetic throat on axial ion beam formation
Effect of radial plasma transport at the magnetic throat on axial ion beam formation
复制标题
磁喉处径向等离子体输运对轴向离子束形成的影响
DOI：
10.1063/1.4960828
复制
发表时间：
2016
影响因子：
2.2
通讯作者：
R. Boswell
中科院分区：
文献类型：
--
作者：
Yunchao Zhang;C. Charles;R. Boswell
在一个带有会聚-发散磁喷管的螺旋等离子体反应器中，研究了径向等离子体输运与轴向离子束形成之间的关系。在高磁场模式和低磁场模式下测量了等离子体放电的电子能量概率函数、等离子体密度、等离子体电势和电子温度，两种磁场模式表现出不同的径向参数行为。虽然轴向电位降发生在两种场模式的等离子体源，离子束只观察到在高场模式，而不是在低场模式。高能离子的传输的特点是下游的等离子体源使用定界离子电流和非本地离子电流。在扩散室中还观察到离子束强度的衰减。
Correlation between radial plasma transport and formation of an axial ion beam has been investigated in a helicon plasma reactor implemented with a convergent-divergent magnetic nozzle. The plasma discharge is sustained under a high magnetic field mode and a low magnetic field mode for which the electron energy probability function, the plasma density, the plasma potential, and the electron temperature are measured at the magnetic throat, and the two field modes show different radial parametric behaviors. Although an axial potential drop occurs in the plasma source for both field modes, an ion beam is only observed in the high field mode while not in the low field mode. The transport of energetic ions is characterized downstream of the plasma source using the delimited ion current and nonlocal ion current. A decay of ion beam strength is also observed in the diffusion chamber.