SYMMETRY CONSIDERATIONS FOR GRID-LAUNCHED ION-ACOUSTIC WAVES.
SYMMETRY CONSIDERATIONS FOR GRID-LAUNCHED ION-ACOUSTIC WAVES.
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栅极发射离子声波的对称性考虑。
DOI：
10.1063/1.1693482
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发表时间：
1969
影响因子：
4.6
通讯作者：
J. Jacob
中科院分区：
文献类型：
--
作者：
I. Bernstein;J. Hirshfield;J. Jacob
将细网格网格（或一组平行网格）浸入等离子体中被广泛用于激发离子声波。栅极结构通常被偏置，以便反射电子和传输离子。由于在网格区域中施加射频场而对离子的影响是提供速度和密度调制的某种组合。相关联的施加电场扰动将具有关于网格系统的对称平面的奇数和偶数空间对称部分的组合。控制微分方程在离子声学极限下的稳态解被证明严重依赖于这种源对称性，并且仅在奇对称的情况下才能简化为通常的解。设计用来测试这些对称性预测的实验已经使用前面描述的装置进行了，除了四栅极发射器已经取代了三栅极发射器。外部两个栅极接地，内部两个栅极可以同相驱动（奇数E...
Immersion of a fine‐mesh grid (or set of parallel grids) into a plasma is widely used to stimulate ion‐acoustic waves. The grid structure is usually biased so as to reflect electrons and transmit ions. The effect upon the ions due to applied rf fields in the grid region is to provide some combination of velocity and density modulation. The associated applied electric field perturbations will possess a combination of odd and even spatially symmetric parts, about the plane of symmetry of the grid system. The steady‐state solution of the governing differential equation in the ion‐acoustic limit is shown to depend critically upon this source symmetry, and to reduce to the usual solution only for the case of odd symmetry. Experiments designed to test these symmetry predictions have been carried out using an apparatus described previously, except that a four‐grid transmitter has been substituted for the three‐grid one. The outer two grids are grounded and the inner two grids can be driven either in phase (odd E...