Resistive Instabilities and Transport Phenomena in Spheromak Plasma

Spheromak 等离子体中的电阻不稳定性和输运现象

• 批准号: 60580002
• 负责人: KANEKO Shobu
• 金额: $ 1.15万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1985
• 资助国家: 日本
• 起止时间: 1985 至 1987
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-60580002/
• 关键词: Spheromak; Compact Toroid; MHD Equilibrium; MHD Stability; Resistive Instability; 輸送現象; プラズマ; 閉じ込め; 安定性

The stability analysis by the ideal magnetohydrodynamic (MHD) plays an important role to investigate the resistive instabilities of a plasma. Hence, we need investigate the ideal MHD stability of the spheromak by use of a realistic model. The following investigations were made for this purpose.1. We investigated how the Mercier criterion is useful to analyze the stability of the spheromak and found that it gives a good criterion for internal modes other than kink modes.2. The flux conserver (FC) has a hole and a duct to introduce the plasma into it, and also has an external coil to close all the magnetic surfaces in FC. THE MHD equilibrium configurations in such a complex region are determined by using the boundary fitted curvilinear coordinate system. The stabilities of them are investigated by use of the Mercier criterion. As results of computations, we obtained the plasma confinement is improved considerably by the external coil current, and the improvement is larger when a center conductor is installed in FC. Experimental results show all the magnetic surfaces are surely closed when the external coil current is applied. However, the life time of the plasma does not change appreciably whether the center conductor is installed or not. Measurements of the magnetic field distribution revealed there exists a region near the symmetric axis, where no toroidal magnetic field is found. We call this region ther flux hole (FH).3. We investigated the effect of FH on the stability of the spheromak and found that it has a stabilizing effect. We made other investigations. For examples,4. the resistive instabilities of the spheromak by using Glasser, Green and Johnson's results, and 5. the effects of trapped particles on the transport phenomena. About detailed points, see the report on the results obtained by this Grant-in-Aid.

理想磁流体动力学（MHD）稳定性分析是研究等离子体电阻不稳定性的重要方法。因此，我们需要用一个实际的模型来研究球马克的理想MHD稳定性。为此目的进行了以下调查。我们研究了Mercier判据如何用于分析球马克的稳定性，发现它对扭结模以外的内模给出了一个很好的判据.磁通保持器（FC）有一个孔和一个管道，以将等离子体引入其中，并且还具有一个外部线圈，以封闭FC中的所有磁表面。用边界拟合曲线坐标系确定了这种复杂区域的磁流体平衡位形。利用Mercier判据研究了它们的稳定性。计算结果表明，外加线圈电流对等离子体约束有明显的改善作用，其中中心导体对约束的改善作用更大。实验结果表明，当外加线圈电流时，所有的磁面都是闭合的。然而，等离子体的寿命不会明显改变是否安装中心导体。磁场分布的测量表明，在对称轴附近存在一个没有环向磁场的区域，我们称这个区域为磁通洞（FH）.我们研究了FH对球形马克稳定性的影响，发现它具有稳定作用。我们做了其他调查。例如，4.利用Glasser、绿色和约翰逊的结果研究了球马克的电阻不稳定性;捕获粒子对输运现象的影响。关于详细的要点，请参阅关于该补助金所取得的成果的报告。

项目成果

M. Taguchi: "Transport Theory of Axisymmetric Toroidal Plasma with RF Wave Source in the Pfirsch-Schluter Regime" Nuclear Fusion. 27. 931-940 (1987)

M. Taguchi：“Pfirsch-Schluter 体系中具有射频波源的轴对称环形等离子体的传输理论”核聚变。

Shobu Kaneko: Journal of the Physical Society of Japan. 55. 1918-1924 (1986)

Shobu Kaneko：日本物理学会杂志。

S.Kaneko: J.Phys.Soc.Jpn.54. 3347-3357 (1985)

S.Kaneko：J.Phys.Soc.Jpn.54。

A.Kamitani: J.Phys.Soc.Jpn.56. 2755-2764 (1987)

A.Kamitani：J.Phys.Soc.Jpn.56。

S. Kaneko: "Magnetohydrodynamic Stability of Spheromak Plasma in Spheroidal Flux Conserver-Application of Mercier Criterion-" J. Phys. Soc. Jpn.55. 1918-1924 (1986)

S. Kaneko：“球体通量守恒器中 Spheromak 等离子体的磁流体动力学稳定性 - Mercier 准则的应用 -”J. Phys。