Study of MHD characteristic of burning plasmas by the kinetic MHD model

动力学MHD模型研究燃烧等离子体的MHD特性

• 批准号: 15560716
• 负责人: NAITOU Hiroshi
• 金额: $ 2.05万
• 依托单位: Yamaguchi University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15560716/
• 关键词: nuclear fusion; extended MHD model; kinetic model; internal kink mode; vortex; Kelvin-Helmholtz instability; international information exchange

As the MHD phenomena in tokamaks enter into the collisionless regime, needs for the kinetic (or extended) MHD simulation have been increased. We have developed the simulation model which includes electron inertia, diamagnetic effect, and ion Landau damping. To simulate the m=1 and n=1 internal kink mode, the collisionless skin depth (d_e〜1mm) which is three orders of magnitude smaller than the minor radius is resolved. The results are summarized as follows : (1) As the pressure gradient increases the internal kink mode (IK mode) is stabilized by the diamagnetic effects but the new mode appears with the smaller growth rate and with the frequency of drift wave (DIK mode). There is a stability window between unstable regions of both modes if the ion Landau damping is included. (2) DIK mode can also cause full magnetic reconnection. The linear mode pattern of the DIK mode is basically similar to that of the IK mode but has a strong poloidal shear flow to generate small vortices in the nonlinear stage due to the Kelvin-Helmholtz like instability. There appears turbulent region due to the nonlinear coupling of vortices. The DIK mode is first stabilized by the excitation of vortices but later it is destabilized with enhanced growth rate.We have also executed the multi-scale simulation of tearing mode and drift-wave turbulence and found that the growth rate of tearing mode is accelerated by the nonlinear coupling.The ideal linear MHD analysis code MARG2D is improved to simulate the free-boundary peeling-ballooning mode appearing in the tokamak peripheral region.

随着Tokamaks中的MHD现象进入无碰撞状态，对动力学（或扩展）MHD模拟的需求已增加。我们开发了包括电子惯性，磁磁效应和离子兰道阻尼的模拟模型。为了模拟M = 1和n = 1内部扭结模式，无碰撞皮肤深度（D_E〜1mm）比小半径小三个数量级。结果总结如下：（1）随着压力梯度的增加，内部扭结模式（IK模式）通过磁管效应稳定下来，但是新模式以较小的生长速率和漂移波的频率（DIK模式）出现。如果包括离子Landau阻尼，则两种模式的不稳定区域之间都有一个稳定窗口。 （2）DIK模式也可能导致完整的磁重新连接。 DIK模式的线性模式模式基本上与IK模式的线性模式相似，但是由于开尔文·赫尔姆霍尔茨（Kelvin-Helmholtz），在非线性阶段具有强型剪切流量，以在非线性阶段产生小涡流。由于涡旋的非线性耦合，出现湍流区域。首先，DIK模式通过涡旋的兴奋来稳定，但后来它会因增长速度增长而稳定。我们还执行了撕裂模式和漂移波湍流的多尺度模拟，并发现撕裂模式的增长速率被非线性耦合加速。理想的线性MHD MHD分析模式的模式可以改善MARG2D的模式。 Tokamak外围区域。

项目成果

内藤裕志, 矢木雅敏: "PCクラスタを作ってみませんか?1.はじめに"プラズマ・核融合学会誌. 79・8. 750-751 (2003)

Hiroshi Naito、Masatoshi Yagi：“你想创建一个 PC 集群吗？1. 简介”日本等离子体与核聚变学会杂志 79・8（2003 年）。

Effect of Ion Viscosity on Neoclassical Tearing Mode

离子粘度对新古典撕裂模式的影响

• 发表时间: 2005
• 期刊: J.Plasma Fusion Res.SERIES 6巻
• 作者: S.Yoshida;S.-I.Itoh;M.Yagi
• 通讯作者: M.Yagi

Nonlinear simulation of tearing mode based on 4-field RMHD model

• DOI: 10.1088/0029-5515/45/8/018
• 发表时间: 2005-08
• 期刊: Nuclear Fusion
• 影响因子: 3.3
• 作者: M. Yagi;S. Yoshida;S. Itoh;H. Naitou;H. Nagahara;J. Leboeuf;K. Itoh;T. Matsumoto;S. Tokuda;M. Azumi

Effects of ion Landau damping and vortex generation on the kinetic internal kink model

离子朗道阻尼和涡流产生对动力学内扭结模型的影响

• 发表时间: 2006
• 期刊: Bulletin of the American Physical Society 51・7
• 作者: G Saibene;N Oyama;Y Andrew;JG Cordey;E de la Luna;C Giroud;K Guenther;T Hatae;GTA Huysmans;Y Kamada;MAH Kempenaars;A Loarte;J Lonnroth;D McDonald;A Meiggs;MFF Nave;V Parail;R Sartori;S Sharapov;J Stober;T Suzuki;M Takechi;K Toi;H Ur;N.Aiba;H.Naitou
• 通讯作者: H.Naitou

M.Furukawa, S.Tokuda, M.Wakatani: "Stability of ideal MHD ballooning modes and its stabilization by toroidal rotation shear near separatrix"Plasma Phys.Control.Fusion. 46・2. 409-421 (2003)

M.Furukawa、S.Tokuda、M.Wakatani：“理想 MHD 气球模式的稳定性及其通过分离线附近的环形旋转剪切的稳定性”Plasma Phys.Control.Fusion 46・2（2003）。