Control of Plasma Instabilities and Transport

这项研究是在控制等离子体不稳定性和 不稳定性驱动反常输运研究 具体而言是 利用一种新的等离子体不稳定性的多模反馈稳定 将研究“正常模式状态”的概念。 状态反馈 结合状态重建器或卡尔曼滤波器的方案 将设计过滤器。 一种适用于高功率的远程抑制器， 还将开发低温等离子体。 此外，不稳定 驱动的异常扩散将实验研究，包括其 与不稳定性参数的关系。 实验工作将 利用重新设计的哥伦比亚直线机床。 本文的研究工作是等离子体的反馈控制 不稳定性和由它们引起的异常等离子体输运。 不稳定性折磨着所有的等离子体，不管设备的类型如何 它们是其预期应用的一部分。 其中包括基本 实验装置、中性、电子和离子等离子体源 用于固态制造和熔化的等离子体蚀刻装置 机械.不稳定性导致等离子体中的非均匀性，增加了 运输，如果足够猛烈，可以导致宏观破碎。 的 消除这些不稳定性有时是必要的，但它们 为了更好的性能，总是希望抑制。 作为重新设计 越来越好的均衡往往无法消除这些 不稳定性完全，反馈控制似乎是一个非常 有吸引力但被忽视的研究领域。

This research is in the control of plasma instabilities and the study of instability driven anomalous transport. Specifically, the multimode feedback stabilization of plasma instabilities utilizing a new concept of 'normal mode states' will be studied. A state feedback scheme in conjunction with either a state reconstructor or a Kalman filter will be devised. A remote suppressor appropriate for high temperature plasma will also be developed. Furthermore, instability driven anomalous diffusion will be experimentally studied including its relationship with instability parameters. The experimental work will utilize the redesigned Columbia Linear Machine. This research effort is in the feedback control of plasma instabilities and on the anomalous plasma transport induced by them. Instabilities afflict all plasmas irrespective of the type of devices they are part of and their intended applications. These include basic experimental devices, plasma sources for neutral, electron and ion beams, plasma etching devices for solid state fabrication and fusion machines. The instabilities cause non-uniformities in plasma, increased transport and, if violent enough, can cause macroscopic break up. The elimination of these instabilities is sometimes necessary, but their suppression is always desirable for better performance. As redesigning increasingly better equilibria has often failed to eliminate these instabilities completely, feedback control appears to be a very attractive but neglected area of researach.