Investigations on Confinement Improvement by Supressing Microscopic Instabilities in Toroidal Plasmas

通过抑制环形等离子体中微观不稳定性来改善约束的研究

• 批准号: 02808003
• 负责人: ITOH Kimitaka
• 金额: $ 1.41万
• 依托单位: National Institute for Fusion Science
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1990
• 资助国家: 日本
• 起止时间: 1990 至 1991
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02808003/
• 关键词: Anomalous Transport; Toroidal Plasma; Microscopic Instability; Magnetiv Hill; Current Diffusivity; Disruptive Instability; 微視見不安定性; 磁場配位; ドリフト反転; スクレイプオフ層; 境界条件

The objective of this research is to develop the method to reduce the anomalous transport. Based on the working hypothesis that the cross field transport is driven by microscopic instabilities, we study the way to reduce the transport coefficient by suppressing the microinstabilities.By this research project, we have obtained a new theoretical result on the anomalous transport in Torsatron/Heliotron configurations. The theory includes the roles of the current diffusivity. This new model formula, though appricable only to the systems with the magnetic hill, explains the majority of the experimental observations on confinement in such devices. If further verification will be gained through future examination with experiments, this method will give a guiding principle to predict a cofiguration, in which anomalous transport is reduced. In tokamaks, it has been shown that the toroidicity is a critical element to cause the anomalous transport. The theoretical model can be extended to systems with the magnetic well, by employing the ballooning formalism. The extension and generalization are left for the future study.By studying the current diffusicity, we have obtained a new phsics picture of the disruptive phenomena. The mechanism of the accelerated growth of the global instabilities is presented. The magnetic braiding by the global instabilities gives rise to the enhanced current diffusivity, which then increases the growth rate of the mode.In summary, this research project has shown a considerable progress in the original programme as well as in the unexpected area of the research.

本研究的目的是开发减少异常传输的方法。基于跨场输运是由微观不稳定性驱动的工作假设，我们研究了通过抑制微观不稳定性来降低输运系数的方法。通过这个研究项目，我们获得了Torsatron/Heliotron中反常输运的新理论结果配置。该理论包括电流扩散率的作用。这个新的模型公式虽然仅适用于具有磁山的系统，但解释了有关此类设备中约束的大部分实验观察结果。如果通过未来的实验检验得到进一步验证，该方法将为预测减少异常传输的配置提供指导原则。在托卡马克中，已经证明环形性是引起异常输运的关键因素。通过采用气球形式主义，理论模型可以扩展到具有磁井的系统。扩展和推广留待以后的研究。通过研究当前的扩散性，我们获得了破坏现象的新的物理图景。提出了全球不稳定因素加速增长的机制。全局不稳定性引起的磁编织导致电流扩散率增强，从而提高了模式的增长率。 总之，该研究项目在原始计划以及意想不到的研究领域中都取得了相当大的进展。

项目成果

Evolutionary sequences for Nova V1974 Cygni using new nuclear reaction rates and opacities

使用新的核反应速率和不透明度的 Nova V1974 Cygni 的进化序列

• DOI: 10.1046/j.1365-8711.1998.01312.x
• 发表时间: 1998-05-21
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: S. Starrfield;J. Truran;M. Wiescher;W. Sparks
• 通讯作者: W. Sparks