MECHANISM FOR GENERATION AND RELAXATION OF DISRUPTIONS BASED ON NAMOLAOUS TRANSPORT

基于纳莫拉乌斯运输的干扰产生和缓解机制

• 批准号: 04808002
• 负责人: ITOH Kimitaka
• 金额: $ 1.15万
• 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: 1992
• 资助国家: 日本
• 起止时间: 1992 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04808002/
• 关键词: Disruptive Instability; Anomalous Transport; Toroidal Plasmas; Magnetic Stochasticity; Bifurcation; Turbulence; Viscosity; トロイダルプラズマ; 磁場乱雑化; ディスラプディブ不安定性; 磁気乱雑化; 粘性; 電子粘性; magnetic trigger

This research aims to provide a basic understanding for the various disruptive phenomena in toroidal plasmas. We propose a new mechanism of the nonlinear link between the anomalous transport and the plasma instabilities. It is found that the electron viscosity, which is enhanced much if the stachasticity condition is satisfied, can cause the increment in the instability glowth rate. As a result of this coupling, an explosive burst of the plasma deformation occurs, in the case that the perturbation amplitude exceeds a threshold condition for the magnetic stochasticity. If the deformation becomes so large that the ion viscosity is enhanced, then the mode growth is prohibited. These mechanisms explain an abrupt occurence of the disruption, rapid growth which seems to be independent of the resistivity, and the sudden termination of the destruction.This methodology is extended to the microscopic fluctuations in the plasma. It is found that the plasma turbulence can causes the growth of fluctuations : The stationary state is realized by the ballance between the nonlinear destabilization (via electreon viscosity) and the nonlinear stabilization (through ion viscosity and thermal diffusivity). This theoretical framwork gives a qualitative advancement in the transport theory in comparison with the conventional quasi-linear picture of turbulence. The transport coefficient, which is given by this'Self-sustained Thrbulence'theory, seems to explain various features in the L-mode and improved confinement modes in toroidal plasmas.

本研究的目的是提供一个基本的了解，在环形等离子体中的各种分裂现象。提出了反常输运与等离子体不稳定性之间非线性联系的新机制。结果表明，电子粘滞性在满足失稳性条件时大大增加，从而导致不稳定性发光率的增加。作为这种耦合的结果，在扰动幅度超过磁随机性的阈值条件的情况下，发生等离子体变形的爆炸性爆发。如果变形变得如此之大以致于离子粘性增强，则模式生长被禁止。这些机制解释了破裂的突然发生、似乎与电阻率无关的快速增长以及破坏的突然终止。结果表明，等离子体湍流可以引起涨落的增长：稳态是通过非线性失稳（通过驻极体粘性）和非线性稳定（通过离子粘性和热扩散）之间的平衡来实现的。与传统的准线性湍流图像相比，这种理论框架在输运理论上有了质的进步。传输系数，这是由这个“自持Thrbulence”理论，似乎可以解释各种功能的L-模式和改进的约束模式在环形等离子体。

项目成果

伊藤公孝(他): "Thermal and Electric Oscillation driven by Orbit Loss in Helical Systems" Physics of Plasmas. 1. 796-798 (1994)

Kimitaka Ito（等人）：“螺旋系统中轨道损失驱动的热振荡和电振荡”《等离子体物理学》1. 796-798 (1994)。

K.Itoh, H.Sanuki, S.-I.Itoh: ""Influence of Fast Ion Loss on Radial Electric Field in Wendelstein VII-A" Nuclear Fusion. 32. 1047-1050 (1992)

K.Itoh、H.Sanuki、S.-I.Itoh：“快离子损失对 Wendelstein VII-A 核聚变中径向电场的影响”。32. 1047-1050 (1992)

K.Itoh, S.-I.Itoh, A.Fukuyama, M.Yagi, M.Azumi: ""Self-Sustained Turbulencve and L-mode Confinement in Toroidal Plasmas II"" Plasma Physics and Controlled Fusion. 36. 1501-1520 (1994)

K.Itoh、S.-I.Itoh、A.Fukuyama、M.Yagi、M.Azumi：“环形等离子体中的自持湍流和 L 模式约束 II”等离子体物理和受控聚变。

K.Itoh, S.-I.Itoh, A.Fukuyama, M.Yagi, H.Sanuki: ""Theory of Anomalous Transport in Toroidal Plasmas"" Fusion Technology. 22 (in press). 1995

K.Itoh、S.-I.Itoh、A.Fukuyama、M.Yagi、H.Sanuki：“环形等离子体中的异常输运理论”聚变技术。

伊東,公孝(他): "Cross Field Ion Motion at Sawtooth Crash" J.Phys.Soc.Jpn.62. 399-402 (1993)

Ito, Kimitaka (等人)：“锯齿碰撞时的跨场离子运动”J.Phys.Soc.Jpn.62 (1993)。