Control of Plasma Instabilities and Transport

9307179 Sen该项目提出了等离子体不稳定性反馈控制方面的新努力，这可能与制造业中使用的各种等离子体源和设备相关。所有的等离子体都受到不稳定性和随之而来的波动的影响，这导致等离子体中的不均匀性，传输增加，以及可能的微观破裂。消除不稳定性有时是必要的，但为了获得更好的性能，抑制不稳定性总是可取的。所提出的调制离子束抑制器是一种独特的、真正无干扰的远程控制器，适用于大多数等离子体设备。所提出的状态反馈和最优控制方案是适用于多模态复杂系统的通用控制系统。此外，针对具有部分未知动力学的控制等离子体的挑战性问题，提出了自适应控制器和神经网络控制器。最后，提出的异常输运（包括其标度行为）研究解决了等离子体科学和工程中的一个基本开放问题。所有提出的研究都集中在共同的问题上，并提出了与所有等离子体器件相关的通用解决方案，而不考虑其应用。＊＊＊

9307179 Sen This project proposes new efforts in the feedback control of plasma instabilities which could have relevance for a variety of plasm sources and devices used in the manufacturing industry. All plasmas are subject to instabilities and consequent fluctuations, which cause nonunforimities in the plasma, increased transport, and possibly microscopic breakup. The elimination of instabilities is sometimes imperative, but their suppression is always desirable for better performance. The proposed modulated ion beam suppressors are unique truly non-perturbing remote type controllers applicable to most plasma devices. State feedback and optimal control schemes proposed are generic control systems suitable for complex systems with many modes of instabilities. Furthermore, adaptive and neural net controllers are proposed for the challenging problem of controlling controlling plasmas with partly unknown dynamics. Lastly, the proposed study of anomalous transport (including its scaling behavior) addresses a fundamental open question in plasma science and engineering. All the proposed studies focus on common problems and propose generic solutions relevant to all plasma devices, irrespective of their appplications. ***