Study of Nonlinear Wave Plasma Interaction

该提案是NSF资助ECS-8314488研究的延续 非线性波与等离子体相互作用 实验 将专注于二维的实验室研究， DC和RF等离子体中的时间相关的等离子体鞘。 具体 将注意力放在对相关鞘的理解上， 与等离子体源离子注入（PSII），一种技术的PI的， 最近开始发展。 实验将利用 先前的发射探针诊断开发允许等离子体 具有良好的空间和时间分辨率的潜在测量。 研究了直流、脉冲和直流电磁场的空间和时间特性， 将进行正弦鞘。 实验将建立在 最近的结果表明，一维描述的 鞘不能解释自洽等离子体电位远离 电极或正电极附近的等离子体电位骤降， 灯丝产生等离子体。 继续发展PSII， 通过向浸没的材料施加大的负脉冲来注入离子 在等离子体中，需要理解二维和 脉冲鞘效应 实验室实验将与 小规模的实验结果的计算机建模的努力。 这项更新建议将集中于实验室研究 二维等离子体鞘--非线性等离子体的一个例子 结构. 鞘是非中性等离子体区域， 几乎总是存在于等离子体边界， 发现与边界断开，即双层。 他们是 等离子体中最古老的已知现象之一， 对它们的某些方面了解甚少。 发挥着重要作用 在许多商业设备和应用中， 鞘现象的发生会产生相当大的经济影响。

This proposal is a renewal of NSF grant ECS-8314488 on a Study of Nonlinear Wave Plasma Interaction. The experiments will concentrate on laboratory studies of two dimensional and time dependent plasma sheaths in DC and RF plasmas. Specific attention will be paid to the understanding of sheaths associated with Plasma Source Ion Implantation (PSII), a technique the PI's have recently begun to develop. Experiments will take advantage of previous emissive probe diagnostic development which allow plasma potential measurements with good spatial and temporal resolution. Studies of the spatial and temporal characteristics of DC, pulsed and sinusoidal sheaths will be conducted. Experiments will build on recent results which indicate that one-dimensional descriptions of sheaths cannot explain the self-consistent plasma potential far from electrodes or plasma potential dips near positive electrodes in filament produced plasmas. Continued development of PSII, which implants ions by applying large negative pulses to materials immersed in plasmas, requires an understanding of both two dimensional and pulsed sheath effects. Laboratory experiments will be combined with small scale efforts on computer modeling of experimental results. This renewal proposal will concentrate on laboratory studies oftwo dimensional plasma sheaths - one example of nonlinear plasma structures. Sheaths are non-neutral plasma regions that are almost always present at plasma boundaries and are sometimes found disconnected from boundaries, i.e. double layers. They are among the oldest known phenomena in plasmas yet many important aspects of them are poorly understood. They play an important role in many commercial devices and applications, and hence investigations of sheath phenomena can have considerable economic impact.